Total: 272

*A computational comparison of open-source branch-and-price solvers*- Column generation algorithms are relevant for addressing problems featuring a large number of decision variables (i.e., columns), commonly encountered in transportation and logistics problems such as vehicle routing and scheduling of staff or resources. When these optimization problems involve integrality constraints, column generation algorithms can be integrated into a branch-and-bound tree. This solution method is also referred to as branch-and-price. Historically, such algorithms have been predominantly developed within closed-source solvers, which raises issues regarding the comparability and reproducibility of computational experiments. Recently, the academic community has introduced open-source branch-and-price solvers to address these concerns. This project aims to compare two such open-source solvers in terms of computational time and flexibility across various families of mixed-integer problems (MIPs). The selected open-source solvers are:
- Student: Jules Schneuwly , June 21, 2024
- Supervision: L�a Ricard, Fabian Torres, Michel Bierlaire
*Solve the problem of the EPFL campus in MOBi,*- Student: Anne-Val�rie Preto (SGC), June 09, 2024
- Supervision: Negar Rezvany, Fabian Torres, Michel Bierlaire, Antonin Danalet
*Construction of an Itinerary Optimization Algorithm for a Trip Planning App*- The proliferation of mobile and web applications for travel planning necessitates advanced optimization algorithms to efficiently organize itineraries. This semester project aims to develop an innovative itinerary optimization algorithm for a trip planning application, addressing the Generalized Price-Collecting Traveling Salesman Problem with Resource Constraints. The algorithm's primary objective is to automate the organization of travel elements (hotels, restaurants, and activities) into a coherent daily schedule, optimizing for travel time, cost, and user preferences. The project begins by leveraging a recommendation algorithm that selects a set of events based on user input, consisting of activities, dining options, and accommodations. These events are organized into an extended set, allowing for greater flexibility and optimization potential. The core of the project involves the construction of an optimization algorithm that integrates travel time computations between events, using Google Maps API, and optimizes the sequence of events to minimize overall travel time, while considering the rank and cost of each event. Initial objectives include the implementation of travel time calculations and the development of a basic itinerary optimization model. Subsequent phases will expand the event set and refine the optimization model to balance travel time, event desirability, and cost, ultimately producing an itinerary that offers the best possible experience for the user.
- Student: Gabriel Andr� Veigas Marques, June 07, 2024
- Supervision: Fabian Torres, Tom Haering, Michel Bierlaire
*Comparison of different methodologies for interpolating traffic count data*- In this project, our objective is to evaluate various methodologies for interpolating gaps in traffic count data, assessing their effectiveness in relation to computational and data requirements. We focus on the case study of Switzerland using the data provided by Canton Vaud. This data has been collected from different locations over several years using different data collection procedures which resulted in having unbalanced data with different missing information and inconsistencies. In order to construct a realistic network, we want to investigate the different methodologies to fill these missing information and compare it with the existing solution provided by Canton.
- Student: Mya Jamal Lahjouji (SGC), May 31, 2024
- Supervision: Marija Kukic, Nicholas Molyneaux, Michel Bierlaire
*Comparative analysis of discrete choice models estimation using different software packages*- Since their establishment in the field of econometrics, discrete choice models have been extensively used in many research fields such as transportation, environmental economics, health, energy, marketing, and others. Currently, there is a plethora of commercial and open-source software that can be used for the estimation of discrete choice models. Biogeme (Bierlaire, 2003) and Apollo (Hess & Palma, 2019) are two of the most appealing alternatives, as they are both open-source (based on Python and R respectively) and cover a broad range of advanced discrete choice models and diagnostics. More recently, other alternatives have been developed such as mixl (Molloy et al., 2021) and MO|DE.behave (Reul et al., 2023). Given the differences in the code development and the tools used, this project aims at investigating (a) differences in performance and computational speed between the two packages, (b) potential differences in the results and model statistics for the same models and datasets, and (c) available functionalities i.e., what are the common features and what are the specific features of some packages that are not available in others. Understanding the pros and cons of each package via this comparative analysis can ultimately lead to more optimised and accurate software for estimating discrete choice models.
- Student: Alexia Stephanie Liviana Paratte, May 31, 2024
- Supervision: Evangelos Paschalidis, Negar Rezvany, Michel Bierlaire
*Improving the specification of migration aspiration discrete choice models via attitudinal variables*- International migration is a crucial but controversial topic that raises issues and concerns to be resolved in the parties involved. In industrialised nations, the proportion of immigrants in total population increased between 1960 and 2019, raising fears about economic costs for natives, loss of national identity, and integra- tion issues. In poor countries, international migration raises concerns regarding brain drain of highly-skilled people, as college and university graduates have a higher tendency to emigrate than the less educated (Beine et al., 2021). The accurate understanding and prediction of migration motifs are crucial from a policy- making perspective, to measure for instance the immigration pressure a country faces. Improved models can help to predict and adjust migration flows but also to identify and mitigate adverse effects on all parties involved. The objective of this project is to extend advanced discrete choice model specifications that address issues such as the independence from irrelevant alternatives (IIA). For instance, Beine et al. (2021) implemented a cross-nested logit (CNL) model to approximate the substitution patterns in migration aspirations of Indian individuals more accurately. The specification of such models could be improved by incorporating addi- tional variables related to risk aversion of the individuals, perceived security of their environment, perceived degradation of the climatic conditions or perceived governance in their country could influence aspiration. To address issues related to measurement errors, these variables will be incorporated in the form of latent variables which have been extensively used in the past in the field of discrete choice models. Ultimately, the objective of this project is to extend the use of latent variables in the context of migration aspiration models and examine whether the insights of previous models (such as the CNL), for instance in terms of substitution, hold when improving this specification.
- Student: Anne-Val�rie Preto (SGC), May 31, 2024
- Supervision: Evangelos Paschalidis, Nicola Ortelli, Michel Bierlaire
*Generating a synthetic population with health and COVID-19 information*- Student: Aline Janvier, January 15, 2024
- Supervision: Cloe Cortes Balcells, Marija Kukic, Michel Bierlaire
*Modeling Individual Activity Schedules and Behavior Changes in COVID-19 Using Metaheuristic Optimization*- The primary objective of this project is to develop an innovative approach that addresses these limitations by using a metaheuristic optimization technique already developed by TRANSP-OR lab, to generate personalized activity schedules for individuals. We will use synthetic population data including information about individuals� characteristics and a comprehensive activity network with coordinates for each facility. The proposed methodology aims to create schedules that 1 optimize a given utility function for every individual. This utility function will consider individual preferences, activity durations, and the impact of COVID-19 restrictions on activity choices. The expected outcomes of this project include a novel framework that provides insights into how individuals modify their behavior and activity plans during periods of COVID-19 restrictions. By integrating a comprehensive network and allowing individuals to select activities from outside their desired schedules, the proposed model will contribute to more accurate and comprehensive epidemiological models. The output of this model will be used as an input for the Interdisciplinary Behavioral Model (IBM) developed by the TRANSP-OR lab. This model integrates individual behavior into both epidemiological and mobility models by combining interdisciplinary research. It integrates epidemiology, mobility, and behavioral modeling, to create a comprehensive model that considers individual-specific behavior in the context of testing, infection levels, and daily activities. Policymakers can leverage these models to make informed decisions regarding the implementation of restrictions and the development of effective risk mitigation strategies.
- Student: Pierre Alexis Hellich, January 15, 2024
- Supervision: Cloe Cortes Balcells, Fabian Torres, Michel Bierlaire
*Investigating latent behaviour in multiday activity scheduling*- In practice, most operational activity-based models have focused on single-day analyses. This common simplifying assumption significantly limits the models' behavioural realism, as they cannot adequately capture the dynamics and processes involved in the scheduling of activities over multiple days. Decisions taken daily are affected by both habits built over time and forward-looking behaviour, where individuals decide based on the expected outcomes of future decisions. A person's activity/travel planning behaviour depends on their behaviour on other days of the week and that there are two main components to this dynamic behaviour: 1. same-day and next-day substitution effects for activities and trips, and 2. latent propensity to engage in some activities or choose a specificc transportation mode. In this semester project, we investigate the existence of these components and how to integrate them into a multiday activity scheduler (OASIS). More specifically, we will attempt to model these unobserved influences in the context of a latent choice model.
- Student: Honoka Shirai, January 15, 2024
- Supervision: Janody Pougala, Negar Rezvany, Michel Bierlaire
*A detailed evaluation of the Via Sicura program*- This project aims at updating and improving the official evaluation of the Via Sicura road safety program.
- Student: Mya Jamal Lahjouji (SGC), June 07, 2023
- Supervision: Nicola Ortelli, Selin Atac, Michel Bierlaire
*Targeting population to evaluate COVID-19 strategies based on activity-travel behavior.*- Countries everywhere in the world have been adopting different policies to lower the toll of the SARS-CoV-2 pandemic. Epidemiological and behavioral models have been widely used to guide decision-making. In this project, we aim at designing a methodology to optimize targeted COVID-19 policies. We will use a simulator provided by the TRANSP-OR lab. This simulator draws the probability of an agent getting infected given its socio-economic characteristics. We hope that this approach will provide insight on transmission and intervention that will complete what can be obtained with usual compartmental models (SIR). We will use health data (Sentinella or SARS-CoV-2) from FOPH. We will review different strategies to determine the trade-off between pharmaceutical interventions (vaccination) and non-pharmaceutical interventions. We will design these policies by accounting for socioeconomic variables of the population, such as age, gender, home address, and general health evaluation, and determine the optimal strategies according to different criteria.
- Student: Antoine Goupil De Bouill�, June 03, 2023
- Supervision: Cloe Cortes Balcells, Tom Haering, Michel Bierlaire
*Predicting activity schedules of the population considering non-pharmaceutical interventions*- COVID-19 creates an undeniable bridge between the epidemiological and the transportation community. Due to the lack of a vaccine in the first stage of the pandemic, controlling mobility becomes the key to containing the spreading of the virus. Understanding how and why people perform their daily activities provides crucial information to define more targeted and less disruptive interventions. However, the link between mobility and the spreading of an infectious disease is double-edged: how people move drives the spreading of the virus, and the presence of the virus has clear repercussions on people scheduling their activities. These reschedulings can be due to a self-choice (I no longer go to the gym because I am scared), or because an external imposes it (the government closes the gyms). In this project, we will focus on the latter since we do not own data to calibrate the parameters of self-choice reschedulings. The aim is to predict the activity schedules of the population considering restrictions derived from COVID-19 presence. We will use an agent-based model provided by the TRANSP-OR lab (OASIS) which integrates the different daily scheduling choice dimensions (activity participation, location, schedule, duration, and transportation mode) into a single optimization problem. We hope this approach will provide insight into how the presence of infectious diseases impacts activity-travel behavior and reflect on potential policy implications/interventions.
- Student: Arthur Nussbaumer, June 03, 2023
- Supervision: Cloe Cortes Balcells, Evangelos Paschalidis, Michel Bierlaire
*Optimisation et D�ploiement d�une m�thode de calculation au sein d�un groupe actif dans le second �uvre*- Student: Thomas Poulain, June 02, 2023
- Supervision: Michel Bierlaire, Bastien Sauve, Phida Etanch�it� SA
*Scenario generation for the multi-agent transport simulation toolkit, MATSim*- CSSs are becoming increasingly popular, primarily due to their financial and environmental advantages. However, they face many operational challenges, including inventory management of vehicles and parking spots, vehicle load balancing and redistribution, pricing strategies, and demand forecasting. If these challenges are not addressed properly, the CSS risks experiencing a significant loss of customers and therefore revenue. The literature consists of variety of works on CSSs especially focused on the rebalancing operations. On the other hand, it lacks the detailed comparison of different strategies of rebalancing operations at a disaggregate level. One approach to fill this gap is using an agent-based transport simulation. Such simulation toolkits allow analysis at the individual level and testing different configurations such as city and network structure. Therefore, in this study the student will review the literature to determine the main characteristics of the CSSs. In the first part of the project, she will work on creating representative scenarios for the multi-agent transport simulation toolkit, MATSim, based on the findings in the literature. These scenarios will be used to compare different rebalancing operations strategies where an optimization module is used. The second part of the project will be implementing analysis scripts that will provide useful information on the simulation results.
- Student: Anne-Valerie Preto (SGC), January 27, 2023
- Supervision: Selin Atac, Nicola Ortelli, Michel Bierlaire
*Comparison of machine learning techniques for synthetic activity generation*- This project aims to investigate the good and the bad sides of state-of-the-art Machine Learning techniques applied in the context of synthetic population generation, focusing on the generation of attributes that de- scribe synthetic activities. Recently, there has been an increase in research focus on the application of deep generative learning algorithms for generating synthetic populations and travel behaviour modelling, including Variational Auto-Encoders (VAEs) and Generative Adversarial Networks (GANs) (Borysov et al., 2019, Wong and Farooq, 2020). Whilst initial experiments show promising results, there are still significant drawbacks with using generative modelling on population synthesis, which includes vanishing gradients, training instability or mode collapse, nor it allows for exact evaluation of the probability density of new points. Based on the literature review, we try to propose possible improvements for existing methodologies by identifying if there is a way to capture better the correlations between variables. One of the techniques that could be improved is Generative Adversarial Networks (GANs). For instance, DATGAN (Lederrey et al., 2022) is a GAN architecture that tries to give more control to the modellers when generating synthetic tabular data. It uses a Directed Acyclic Graph (DAG) to represent the correlation between variables in the dataset. This DAG is then used to define the structure of the Generator. Each variable is represented by an LSTM cell. However, due to the linear nature of LSTM cells, it is required to have a DAG instead of an acyclic graph. This directionality can be an issue when designing the DAG since it represents causality between variables. Thus, we could improve the DATGAN by removing the directionality and only specifying correlations between variables. Graph Neural Networks (GNNs) are a specific type of NN designed to mimic any type of graph, and they can be used to design the architecture for the Generator. This change would give more freedom to the user and make the method more flexible since DATGAN would not require any specific type of graph
- Student: Xinling Li (SGC), January 27, 2023
- Supervision: Marija Kukic, Nicola Ortelli, Michel Bierlaire
*Synthetic generation of activity motifs*- This project aims to work on the extension of the existing simulation framework (Kukic et al., 2021). In the existing methodology, we developed a new approach so-called Divide and Conquer Gibbs Sampler, for the generation of synthetic households. The current version of the framework can generate socio-demographic attributes of individuals (such as gender and age) grouped into households (described by their own set of features) in a realistic and representative way. However, in ABMs, there is a need to generate activities, not only socio-demographic characteristics. Some of the features that describe activities are type, location, start time, etc. However, as shown in the past, the simulation methods struggle to deliver accurate results in a reasonable time while dealing with high-dimensional datasets. According to that, instead of gener- ating disaggregated data on individuals� activities, it would be better to generate aggregated data while preserving the same amount of information. To do so, we will generate synthetic activity motifs. The daily activity motifs are representative graphs where the nodes describe the activity type and location, and the links indicate the sequential order between activities. The advantage of generating activity motifs instead of disaggregated activities is that we can reveal daily mobility patterns while saving computational time and preserving privacy. The first step is to retrieve and replicate the real activity motifs at the level of individu- als. The additional step would be to investigate how to generate the activity motifs of households depending on activities that individuals performed, subject to household constraints (e.g. sharing of resources). Note that the work of pre-study should be focused on the generation of activities that describe the movements of individuals. The investigation of activity motifs at the level of households can be part of the master thesis.
- Student: Bochud Quentin Philippe (SGC), January 27, 2023
- Supervision: Marija Kukic, Janody Pougala, Michel Bierlaire
*Modelling migration intentions worldwide*- Migration across different countries is a major topic of policy debates worldwide that receives relatively little attention in the travel behaviour literature. In industrialized countries, the proportion of immigrants in the total population has increased in recent years resulting in concerns about integration, loss of national identity and economic expenses. In low-opportunity countries, international migration raises fears of loss of highly skilled workers, who are the group most likely to emigrate. Therefore, understanding the main factors that influence the location where migrants choose to settle is of primary interest for both researchers and policy makers. Location choices might be influenced by changes in the attractiveness of the country of origin, of the country of desstination, and of the alternative destinations. A recent study developed a cross-nested logit model to predict migration intentions in India based on characteristics of the individual, characteristics of the destination country and unobserved factors shared between similar destinations. However, there is still a dearth in understanding the main factors influencing migration intentions at a global scale, in countries that differ in terms of size, level of development and willingness to emigrate. The objective of this study is to assess the transferability of the previous model predicting migration intentions in India to other countries in the world. The study will identify the main characteristics of the countries of origin that have an impact on the migration intentions. The data were extracted from the Gallup World Poll (GWP) Survey. The GWP measures a series of key indicators including migration intentions and is one of the most comprehensive datasets available worldwide. Other key indicators measured in the survey are national security, nutrition, housing, job opportunities, financial situation, personal health, civil engagement and overall well-being. The GWP surveys cover more than 150 countries in the world, are usually repeated every year, and include 1000 individuals in each country. In this study, the GWP data will be analysed to select relevant countries based on the coverage, the number of waves available, the respondents per wave, and the variables available. The analysis will identify patterns per country and evolution of migration intentions over time. Mathematical methods will be implemented to understand which variables should be included to improve the model specification and to capture the perceptions of respondents about the living conditions in their country. These methods will be also used to explore the complex correlation patterns between the attributes and the destination choices.
- Student: Hilda Abig�l Horv�th (SMA), January 27, 2023
- Supervision: Silvia Varotto, Nicola Ortelli, Michel Bierlaire
*A model to capture ride-sharing behavior within the agents in a household*- Individuals do not schedule their day in isolation from other members of the household. There is interpersonal dependencies and intra-household interactions within household members which affect their daily schedules and travel patterns. Household car ownership, car availability limitation, joint activity participation, joint trips to joint activities, sharing of common household vehicles, and coordination of household daily rhythms are examples of these interpersonal dependencies. These interdependencies might have multiple reasons and can take multiple forms. Therefore, activity-based and travel demand models should incorporate and represent heterogeneous intra-household interactions in order to reflect reality. Focusing on joint rides, we can classify joint household tours into 3 categories: fully joint tours for shared activities, escorting tours, and synchronised activity tours. In this project, we focus on the third category; synchronised activity tours such as ride-sharing within household members. In this semester project, we will study the ride-sharing behavior within the members of a household. To this aim, we first do a literature review to see how the current studies tackle this matter and to identify the influential variables on the choice of ride-sharing or solo ride. We then develop a model to capture the choice of solo travel or shared ride with other agent(s) of the household considering various variables such as socio-economic characteristics of individuals and households, and activities attributes. We aim to study the ride-sharing behavior within the members of a household and capture the influential variables on the joint tours within a household. Finally, the student is expected to analyze and discuss the model results.
- Student: Mya Jamal Lahjouji (SGC), January 07, 2023
- Supervision: Negar Rezvany, Janody Pougala, Michel Bierlaire
*Optimisation et D�ploiement d�une m�thode de calculation au sein d�un groupe actif dans le second �uvre*- Student: Bastien Sauve (SGC), December 23, 2022
- Supervision: Michel Bierlaire, Bastien Sauve, Phida Etanch�it� SA.
*Heuristic applications for rebalancing operations in one-way car sharing systems*- CSSs are becoming increasingly popular, primarily due to their financial and environmental advantages. However, they face many operational challenges, including inventory management of vehicles and parking spots, vehicle load balancing and redistribution, pricing strategies, and demand forecasting. If these challenges are not addressed properly, the CSS risks experiencing a significant loss of customers and therefore revenue. The literature consists of variety of works on CSSs especially focused on the rebalancing operations. On the other hand, it lacks the detailed comparison of different strategies of rebalancing operations at a disaggregate level. One approach to fill this gap is using an agent-based transport simulation. Such simulation toolkits allow analysis at the individual level and testing different configurations such as city and network structure. Therefore, in this study the student will review the literature to determine two rebalancing strategies existing in CSSs. The student will then focus on developing heuristic algorithms to solve these problems as they are computationally expensive to solve with exact methods.
- Student: Miguel Chastre Rodrigues, September 30, 2022
- Supervision: Selin Atac, Michel Bierlaire
*Divide and conquer one-step simulator for synthetic household generation*- Transportation science today is tasked with predicting the complex mobility needs of individuals, which necessitates the use of advanced mobility and travel demand models. However, the quality of the model outputs depends on the data quality. In transport, data privacy and data availability are two limitations. Therefore, transportation scientists rely increasingly on the usage of synthetic populations. Typically, a synthetic population is generated either on the level of individuals or on the level of households using simulation or machine learning approaches. This project aims to solve the problems of existing simulation techniques for the generation of synthetic households, addressing several literature gaps. In existing methodologies, the generation of individuals and their matching into households is done separately, through two sequential processes. Although the marginal distributions of key generated attributes might show a perfect fit, the �two-step� household generator produces unrealistic households. The generation of illogical observations is caused by neglecting the dependencies between individuals while grouping them into households. In order to create realistic households, this paper suggests a �single-step� household simulator where relationships between individuals are considered simultaneously within the generation process by imposing various statistical constraints. However, as shown in the past, the simulation methods struggle to deliver accurate results in a reasonable time while dealing with high-dimensional datasets. This project changes the traditional Gibbs Sampler into so-called �Divide and Conquer Gibbs Sampler� that solves this problem by decomposing and parallelizing the generation process based on the level of correlation. The expectation of this approach is that it will increase accuracy and efficiency, as highly correlated areas are isolated, enabling a better representation of less probable values. This project aims to work on the extension of the aforementioned existing framework. The extension will contain several steps where we will have to add more attributes that will be generated, which includes modeling of all necessary relationships. The addition of more variables will cause the curse of dimensionality phenomena. To overcome this issue, we will work on improving the divisive Gibbs Sampler in the context of synthetic household generation. We will compare it with the traditional approach by investigating the cost of adding more attributes regarding computational efficiency. Moreover, we will focus on proving the advantages of a one-step simulator compared to a two-step simulator in terms of the realism of generated observations. The methodology will be tested using 2015 Swiss census data.
- Student: Xinling Li (SGC), September 15, 2022
- Supervision: Marija Kukic, Michel Bierlaire
*Modeling congestion in a competitive Facility Location Problem*- Assigning the right Emergency Room (ER) to persons in medical need is a pivotal mission of the Emergency Medical Dispatcher (EMD). In order to minimize the delay between the call and the medical care, EMD need to take into account the travel time and the waiting time at the an ER. The goal of opening an ER is to maximize the demand capture, either to make profit or to relieve other ERs. To achieve this, it is possible to locate the facilities and assign them capacity of service: number of beds or staff members. In this report, a non-linear integer programming formulation is established to model this type of allocation. The formulation is agent-based to encompass individual disparities through discrete choice modelling (DCM).
- Student: Louise Lallemand, August 26, 2022
- Supervision: Tom Haering, Michel Bierlaire
*Comparing rebalancing operations in car sharing systems*- A car sharing system (CSS) offers users to rent cars for a short period of time. The users are identified by an RFID card or through a mobile application. The price of the trip is generally determined according to trip duration and length. One of the challenges faced in such systems is the imbalance of the vehicles throughout the city. This problem is solved by forecasting the demand and rebalancing the vehicles to meet user demand. First, the student is going to review the literature related to rebalancing operations in CSSs. Then, she will design and/or implement different rebalancing strategies in order to test the effects of different characteristics of the city/region. In other words, different strategies (static, reactive, and proactive) for rebalancing operations will be tested for each scenario and the results will be used to drive to conclusions which explain the relation between the city structure, demand structure and the different strategies of rebalancing operations.
- Student: Xinling Li (SGC), July 08, 2022
- Supervision: Selin Atac, Nicola Ortelli, Michel Bierlaire
*A comparitive analysis of optimization algorithms for activity-based applications*- The starting point of this semester project is a Mixed Integer Linear Programming (MILP) optimization framework (Pougala et al, 2021), which simulates the scheduling of activities by considering that individuals try to optimize the utility (or satisfaction) they can gain from a given activity plan. Under a time budget constraint (e.g., 24h), the framework allows to integrate every spatio-temporal dimension of the activity-based paradigm (choice of activity participation, timing decisions, destination, mode, route...) simultaneously. The trade-offs occurring in the decision process are therefore captured explicitly. While the framework is functional, the MILP formulation proves to be limited when it comes to make it operational. Specifically, the dimension of the constraint space and the combinatorial nature of the problem significantly increases the computational time, often too high for practical use.The focus of the project is therefore on investigating a constraint programming approach, and its strengths and limitations compared to the MILP formulation. Constraint programming is a widely used optimization methodology, especially for scheduling applications, as the combinatorial nature of such problems suits the general framework of global constraints, domain filtering and constraint-propagation well. The main objective is to perform a comparative analysis of both optimization approaches on the given activity-based problems on selected case studies.
- Student: Luca Bataillard (SIN), June 10, 2022
- Supervision: Tom Haering, Janody Pougala, Michel Bierlaire
*A discrete choice model to capture the relationship between activity type-location-modality choice of individuals*- With the COVID-19 pandemic, the lifestyle and behavior of people have changed dramatically. Activities which were traditionally done out-of-home (such as work and education), are now more likely to take place in-home and remote working and studying has become an integral part of our lives. Capturing the relationship between activity type (work, study, sleep, shopping, personal care, household care, Leisure), activity location (in-home, out-of-home), and activity modality (virtual, physical) can be used to assess the tradeoff between in-home and out-of-home activities. In this semester project, we will study how the pandemic has impacted the location and activity mode choice (virtual, physical) of individuals. To this aim, we first do an analysis on the 2016-2020 UK Time Use Survey (TUS) data which encompass both pre- and during the Covid-19 pandemic daily diary data. The data analysis aims to determine the average activity duration and frequency of activity episodes per day by activity type, location, and device use. We will then develop discrete choice models to simulate the activity location (in-home, out-of-home) and modality (virtual, physical) for different activity categories (work, study, personal care, household care, shopping, leisure, sleep, organizational work). We aim to capture the preferences for virtual/physical activity participation of different activity types at specific locations. Finally, the student is expected to analyze and discuss the model results.
- Student: Jingran Su (SGC), June 10, 2022
- Supervision: Negar Rezvany, Janody Pougala, Michel Bierlaire
*Road sections clustering*- Pavement maintenance is one of the major issues of public agencies. Inefficient maintenance strategies lead to high economic expenses in the long term. Public agencies rely on pavement management system (PMS) to recommend pavement rehabilitation and maintenance. The first step of a PMS is to create homogeneous worksites of reasonable sizes (considered practical and economically relevant). This is performed by grouping road sections based on conditions data and degradation laws over time for the network. In practice, the grouping or clustering phase is done by a basic algorithm whose results then need to be manually checked and repaired. This makes the task tedious and time consuming. The goal of this project is in a first instance to implement a deterministic clustering algorithm that takes as input road sections information (position, type of surface, type of traffic, age...) together with a deterministic degradation law and regroups the sections in clusters using Machine Learning algorithms such as k-means. In a second instance, a probabilistic degradation law will be considered and a probabilistic clustering algorithm such as Expectation�Maximization will be implemented. Both algorithms will be tested on real world case study and the result will be compared to the results of an existing PMS clustering methodology.
- Student: Salim Benchelabi (SMA), June 07, 2022
- Supervision: Nour Dougui, Marija Kukic, Michel Bierlaire
*Studying socio-economic variables through the different waves of SARS-CoV-2*- The lockdown of March 2020 of several countries has changed the modern world as we know it. Back then, non-pharmaceutical interventions were put into place to mitigate the spreading of the COVID-19. Now, we count on the most effective pharmaceutical intervention, vaccination. In Switzerland, 65.9% of the population is fully vaccinated. At the time, we are dealing with the fifth wave of new cases. However, it is unclear whether the pandemic has a significant impact on the travel behaviour and whether adopting non-pharmaceutical interventions has an impact on daily activities. Therefore, it is important to take a disaggregate approach to analyze the impact of all these variables on the travel behavior of individuals using a disaggregate approach. The long-term goal is to provide insights that transportation planners and public health authorities can exploit to deal with epidemic situations. In this project, we will study the use of different ML algorithms to include the different significant variables that influence the force of infection (probability of going from being susceptible to infected) through the different waves. The main objective is to capture which socio-economic variables of the individuals and which municipality characteristics influence the force of infection and how the impact of these variables change trough the different waves. First, the student will review the existing literature related to epidemiological and activity-based models and get familiar with the tools already developed by the TRANSP-OR lab. Then, the student is expected to test different models through the different waves and check the impact of these variables on behaviour. To account for the contact matrices, we will use FOPH data together with MATSIM output of Switzerland. Finally, the student will calibrate the parameter inside the TRANSP-OR simulator.
- Student: Cl�ment Dauvilliers, June 03, 2022
- Supervision: Cloe Cortes Balcells, Silvia Varotto, Michel Bierlaire
*Drawing infection probabilities based on socio-economic characteristics using ML Causal Inference*- Countries everywhere in the world have been adopting different policies to lower the toll of the COVID-19 pandemic. Epidemiological and behavioural models have been widely used to guide decision-making. In this project, we will study the use of causal inference as a tool to determine which variables are significant and study their causal effect on the probability to become infected. We aim to compare these results with the more traditional approach. It will account for the uncertainty inherent to the nature of the problem to decide which variables are meaningful when modelling the infection with a virus. We hope this new model will provide insight on transmission and intervention that will complete what can be obtained with usual compartmental models (SIR). To do that, each student will implement different causal discovery methods based on graphical models. For example, a score-based method like the greedy equivalence search architecture, or a non-linear method Iike a method based on the linear, non-Gaussian model.
- Student: Hannah Gelblat, February 04, 2022
- Supervision: Cloe Cortes Balcells, Rico Krueger, Michel Bierlaire
*Drawing infection probabilities based on socio-economic characteristics using ML Causal Inference*- Countries everywhere in the world have been adopting different policies to lower the toll of the COVID-19 pandemic. Epidemiological and behavioural models have been widely used to guide decision-making. In this project, we will study the use of causal inference as a tool to determine which variables are significant and study their causal effect on the probability to become infected. We aim to compare these results with the more traditional approach. It will account for the uncertainty inherent to the nature of the problem to decide which variables are meaningful when modelling the infection with a virus. We hope this new model will provide insight on transmission and intervention that will complete what can be obtained with usual compartmental models (SIR). To do that, each student will implement different causal discovery methods based on graphical models. For example, a score-based method like the greedy equivalence search architecture, or a non-linear method Iike a method based on the linear, non-Gaussian model.
- Student: Mathias Nuris, February 04, 2022
- Supervision: Cloe Cortes Balcells, Rico Krueger, Michel Bierlaire
*Adding an Epidemiological penalty in MATSim to study the impact of SARS-CoV-2 in mobility*- Countries everywhere in the world have been adopting different policies in order to lower the toll of the COVID-19 pandemic. Epidemiological and behavioural models have been widely used to guide decision making. In this project, we will study how the disease impacts the choice of activities. For that reason, we will modify the utility scoring function from the activity-based model to introduce the epidemiological penalty. We will add in the utility function, another term called Slevel of virus load to define the impact that an epidemic has on the choice of activities, including travel mode. To estimate the parameters of the model we are planning to use already-existing methodologies like maximum likelihood or Bayesian methods. First, the student will review the existing literature related to epidemiological and activity-based models and get familiar with MATSim software. Then, the student is expected to develop an environment in MATSim using data we will provide. Specifically, we will use the Sioux Falls scenario files which are public, together with google mobility data so that we can modify the base mobility according to the different policies applied during the different waves of SARS-CoV-2. Finally, he will create different scenarios in order to test the effects of different characteristics of the city/region.
- Student: Florent Zolliker (SMA), January 31, 2022
- Supervision: Cloe Cortes Balcells, Negar Rezvany, Michel Bierlaire
*Optimal strategy for a multi-vendor, multi-buyer reverse logistics supply chain framework*- With the boom of e-commerce and online shopping, retailers and logistics operators must look to sustain- able process improvements in their supply chain to manage the growing volume of inventory and returns. A sustainable logistics strategy contributes to a successful transition to a low- or zero-carbon economy and improves the company�s social impact. In the last-mile segment of delivery in urban centers, efficient reverse logistics strategies are essential to reduce the environmental impact of logistics operations and to reduce greenhouse gas emissions. The goal of this project is to describe a multi-vendor, multi-buyer reverse logistics supply chain frame- work, and to implement a suitable optimization algorithm to maximize revenue streams from combining new and re-manufactured products in the reverse logistics based supply chain.
- Student: Olivier Laferr�re (SMT), January 31, 2022
- Supervision: Melvin Wong, Claudia Bongiovanni
*Classification of ordinal outcomes for the analysis of injury severity using machine learning methods (ML for Science CS-433)*- Ordinal scale responses capture qualitative user feedback which can be used to model individual choice preference or are employed in traffic accident analysis to evaluate accident severity. In this project, we aim to predict the outcome of the severity of the accident using machine learning methods, specifically, using a deep neural network to train the crash model. The model accuracy will be evaluated on three metrics: discrete classification accuracy, geometric mean probability of correct assignment and quadratic weighted kappa.
- Student: Hilda Abig�l Horv�th, Julian Paul Schnitzler, Artur Andrzej Stefaniuk (SSC), December 23, 2021
- Supervision: Silvia Varotto, Melvin Wong, Michel Bierlaire, Martin Jaggi
*Designing and implementing rebalancing operations in car sharing systems using MATSim*- In this project, we will focus on Vehicle sharing systems (VSSs). VSSs are becoming increasingly popular, primarily due to their financial and environmental advantages. However, they face many operational challenges, including inventory management of vehicles and parking spots, vehicle load balancing and redistribution, pricing strategies, and demand forecasting. If these challenges are not addressed properly, the VSS risks experiencing a significant loss of customers and therefore revenue. The literature consists of variety of works on VSSs especially focused on the rebalancing operations. On the other hand, the literature lacks the demand forecasting dimension of the VSSs since it is exhausting to collect the data to develop a demand model. This project will aim to address this problem in a different way. Instead of developing a demand model, we aim to simulate the demand structure using an open-source software MATSim (Multi-Agent Transport Simulation Toolkit). The student is expected to develop an environment in MATSim for a car sharing system (CSS) where the census data is used. Then, he will create different scenarios in order to test the effects of different characteristics of the city/region. She will then identify the cases in which the rebalancing operations are needed. The implementation of rebalancing operations will be adapted from the free floating application of MATSim. In other words, different strategies (static, reactive, and proactive) for rebalancing operations will be tested for each scenario and the results will be used to drive to conclusions which explain the relation between the city structure, demand structure and the different strategies of rebalancing operations.
- Student: Alfio Simone Mosset (SGC), July 09, 2021
- Supervision: Selin Atac, Stefano Bortolomiol, Michel Bierlaire
*Modeling Geneva's public transport network following disruption events*- The project is conducted in collaboration with the Transports Publics Genevois (TPG). The principal objective is to simulate the impact of disruptions (e.g. accidents) on the Geneva road network, and to optimize its resilience by proposing targeted and ecient intervention strategies. A particular emphasis will be put on the public transport network.
- Student: Nicolas Richter (SGC), July 09, 2021
- Supervision: Marija Kukic, Janody Pougala, Michel Bierlaire
*Matrix factorisation methods*- The aim of the project is to explore the state-of-the art of the use of matrix factorisation methods in machine learning and econometrics through literature surveys and practical implementation exercises.
- Student: Ambroise Favre, June 30, 2021
- Supervision: Rico Krueger, Michel Bierlaire
*Application of sustainable reverse logistics in optimization of last-mile delivery systems*- This project will investigate the state-of-the-art data-driven approaches to solve these problems using process mining and optimization to model sustainable reverse logistics systems. A comprehensive literature on reverse logistics, last-mile delivery, process mining and optimization techniques will be also be produced. Finally an implementation of the identified approach will be developed as a use case example for reverse logistics
- Student: Jacques Roitel, June 30, 2021
- Supervision: Melvin Wong, Michel Bierlaire
*How to assess synthetic data?*- Student: Romain Palazzo (SMA), June 13, 2021
- Supervision: Gael Lederrey, Nicola Ortelli, Michel Bierlaire
*MoonVR*- Student: Lucas Strauss, June 13, 2021
- Supervision: Claudio Leonardi
*Designing a MATSIM environment to study the impact of SARS-CoV-2 in mobility*- Countries everywhere in the world have been adopting different policies in order to lower the toll of the COVID-19 pandemic. Epidemiological and behavioural models have been widely used to guide decision making. In this project, we aim at building a disaggregate model (agent-based approach) that will couple two models: one with the activities of people and another one with the transmission of the virus. We hope this new model will provide insight on transmission and intervention that will complete what can be obtained with usual compartmental models (SIR). In order to do that, we will use the Matsim API (Episim), hence the student will not code everything from scratch. First, we will review the existing literature related to epidemiological and activity-based models and get familiar with MATSim software. Then, we will develop an environment in MATSim. Specifically, we will use the Berlin scenario files which are public, together with google mobility data so that we can modify the base mobility according to the different policies applied during the different waves of SARS-CoV-2. Finally, we will create different scenarios in order to test the effects of different characteristics of the city/region.
- Student: Antoine Crettenand, June 11, 2021
- Supervision: Cloe Cortes Balcells, Rico Krueger, Michel Bierlaire
*Road Safety: Investigating the Role of Latent Behaviors in Injury Severity*- Reducing the number of fatalities caused by traffic accidents is a major concern everywhere around the world. In order to do so, it is crucial to understand how various factors influence injury severity. The existing literature generally deals with explaining the influence of directly observable variables on the occurence and severity of crashes, but fails to adequately consider driver behavior. Hence, the main goal of this project is to explore approaches that enable the incorporation of latent attitudes in injury severity models. Specifically, we are interested in investigating the "propensity to taking risks" that drivers may exhibit, as well as the influence of such behaviors on the severity of injuries suffered by other road users.
- Student: Daniela Spadaro (SMA), June 07, 2021
- Supervision: Nicola Ortelli, Gael Lederrey, Michel Bierlaire
*Designing a MATSIM environment to study the impact of SARS-CoV-2 in mobility*- Countries everywhere in the world have been adopting different policies in order to lower the toll of the COVID-19 pandemic. Epidemiological and behavioural models have been widely used to guide decision making. In this project, we aim at building a disaggregate model (agent-based approach) that will couple two models: one with the activities of people and another one with the transmission of the virus. We hope this new model will provide insight on transmission and intervention that will complete what can be obtained with usual compartmental models (SIR). In order to do that, we will use the Matsim API (Episim), hence the student will not code everything from scratch. First, we will review the existing literature related to epidemiological and activity-based models and get familiar with MATSim software. Then, we will develop an environment in MATSim. Specifically, we will use the Berlin scenario files which are public, together with google mobility data so that we can modify the base mobility according to the different policies applied during the different waves of SARS-CoV-2. Finally, we will create different scenarios in order to test the effects of different characteristics of the city/region.
- Student: Chantal Gressier (SMA), June 03, 2021
- Supervision: Cloe Cortes Balcells, Negar Rezvany, Michel Bierlaire
*The railway timetable rescheduling problem*- In railway networks, unexpected disruptions may occur for different reasons and cause delays, service denial, and, consequently, passenger inconvenience. This pre-study project will look at remediation strategies such as canceling, delaying or rerouting trains in case of unexpected disruptions. This pre-study project follows two main lines of research. First, the student will familiarize with state-of-the-art methodologies and algorithms to generate railway timetables in a disrupted network. Second, the student will learn how these methodologies can be integrated in the commercial software Viriato, produced by the company SMA und Partner AG.
- Student: Benoit Pahud (SGC), February 19, 2021
- Supervision: Nour Dougui, Marija Kukic, Stefano Bortolomiol, Matthias Hellwig, SMA und Partner AG
*Designing a MATSim environment for a vehicle sharing system as a transport mode*- A vehicle sharing system (VSS) offers users to rent vehicles for a short period of time. The price of the trip is generally determined according to trip duration and length. These systems are becoming increasingly popular, primarily due to their financial and environmental advantages. However, VSSs face many operational challenges, including inventory management of vehicles and parking spots, vehicle load balancing and redistribution, pricing strategies, and demand forecasting. If these challenges are not addressed properly, the VSS risks experiencing a significant loss of customers and revenue. One of the challenges faced in such systems is the imbalance of the vehicles throughout the city. This problem is solved by forecasting the demand and rebalancing the vehicles to meet user demand. However, since it is exhausting to collect the data to develop a demand model, this project will make use of the Multi-Agent Transport Simulation Toolkit (MATSim) to build this environment. First, the student is going to review the literature related to VSSs and get familiar with MATSim software. The student is expected to develop an environment in MATSim for a VSS where the census data is used and the VSS is the only transport mode in the city other than walking. Then, she will create different scenarios in order to test the effects of different characteristics of the city/region. She will then identify the cases in which the rebalancing operations are needed. In other words, different strategies (static, reactive, and proactive) for rebalancing operations will be tested for each scenario and the results will be used to drive to conclusions which explain the relation between the city structure, demand structure and the different strategies of rebalancing operations.
- Student: Paula Vogg (SGC), January 29, 2021
- Supervision: Selin Atac, Cloe Cortes Balcells, Michel Bierlaire
*Schedule repair in liner shipping*- Large liner shipping companies operate several hundred ships worldwide. These ships carry multi-modal containers on pre-established routes with a regular schedule (typically weekly). A schedule is thus an ordered list of port calls (i.e. stops in a harbour) with associated time windows. Since there are several thousands possible ports in the world, designing routes is a complex problem. Furthermore, since a rotation takes weeks or even months, roughly four journeys out of five end up requiring adjustments to accommodate delays, breakdowns or other unforeseeable but frequent events. Due to the extent of the operations, improving from an adequate schedule to an optimal one may yield enormous benefits, not only economically but also in terms of environmental impact and of quality of life for workers. Given the nominal schedule and an additional constraint stemming from an unforeseen event, the aim of the project is to use geographical information and demand statistics in the various ports of a liner shipping network, the student applies Operational Research methodologies to generate a new optimal schedule, completing as much of the original mission as possible while minimising the ecological and economic impacts.
- Student: Benoit Pahud (SGC), January 29, 2021
- Supervision: Stefano Bortolomiol, Nour Dougui, Michel Bierlaire
*Generating choice sets of destinations for activity based applications*- Understanding human mobility behavior is essential to estimate and forecast transport demand. Activity-based models (ABM) are an increasingly popular approach to integrate complex behavioral dimensions influencing mobility choices, such as habits or social interactions. A signicant challenge in ABM research is the choice set for each individual (consisting of the type of activities, the schedules, the locations and the modes to reach them), which is highly combinatorial and thus impossible to fully enumerate. This pre-study will specically investigate the choice set of locations for individuals' daily activities, guided by (but not limited to) the following research questions: (1) How can we generate a plausible set of locations for an individual to consider, for each of their activities? (2) Which attributes can be used to characterize a location or a space (e.g. opening hours, public transport level of service, job density...) ? (3) What is the required granularity or scale to yield consistent results in terms of activity-based estimation, while maintaining a computational tractability ? (4) What are the data requirements for these tasks? What methods or tools can be used to augment datasets which lack this essential information ? The objective is to develop a methodology to generate a choice set of locations, by means of theoretical and data-driven approaches. The choice of location itself is not included in the scope of this project.
- Student: Nicolas Salvad� (SGC), January 29, 2021
- Supervision: Janody Pougala, Tim Hillel, Michel Bierlaire
*Generating choice sets of transport modes for activity based applications*- Understanding human mobility behavior is essential to estimate and forecast transport demand. Activity-based models (ABM) are an increasingly popular approach to integrate complex behav- ioral dimensions influencing mobility choices, such as habits or social interactions. A signicant challenge in ABM research is the choice set for each individual (consisting of the type of activities, the schedules, the locations and the modes to reach them), which is highlycombinatorial and thus impossible to fully enumerate. This pre-study will specically investigate the choice set of transport modes for individuals' daily activities, guided by (but not limited to) the following research questions: (1) How can we generate a plausible set of modes for an individual to consider, for each of their activities? (2) What are the main determinants for including/excluding a mode in the choice set? (3) What are the data requirements for these tasks? What methods or tools can be used to augment datasets which lack this essential information? The objective is to develop a methodology to generate a choice set of modes, by means of theoretical and data-driven approaches. The mode choice itself is not included in the scope of this project.
- Student: Benoit Pahud (SGC), January 29, 2021
- Supervision: Janody Pougala, Tim Hillel, Michel Bierlaire
*Road maintenance management optimisation*- Pavement maintenance is one of the major issues of public agencies. Insufficient investment or inefficient maintenance strategies lead to high economic expenses in the long term. Under budgetary restrictions, the optimal allocation of resources becomes a crucial aspect. Therefore, public agencies rely on pavement management system that prioritize and recommend pavement rehabilitation and maintenance to maximize results within a given budget amount. The goal of this project is to produce a literature review on the existing pavement management systems and methodologies that optimize road maintenance on both network and project level. Besides, different road conditions degradation model should be investigated. Finally, a heuristic method for road maintenance should be implemented and tested on a case study while testing different scenarios of road condition degradation.
- Student: Carole Basl� (SGC), January 29, 2021
- Supervision: Melvin Wong, Nour Dougui, Michel Bierlaire
*Analyzing Machine learning regularization methods in travel mode choice prediction (ML for Science CS-433)*- A problem in machine learning is to make an algorithm perform well not just on the training data, but also on new inputs. There are a number of regularization methods such as L1/L2, Dropout, max-norm that help improve generalization by reducing overfitting/overtraining. A Deep learning model is applied to a travel mode choice dataset. The objective of the project is to investigate regularization methods for improving learning accuracy.
- Student: Simon Dayer, Arnaud Guibbert, Khalil Merzouk (SSC), December 17, 2020
- Supervision: Melvin Wong, Michel Bierlaire, Martin Jaggi
*Optimizing Organizational Chart using local search method*- The aim of this project is to produce a near optimal Organisational Chart for a real case study. This Organisational Chart should optimize the span of control of Management in the company by maximizing a coverage metric using clearly-dened manipulations of the organizational design. To achieve this goal a local search method will be used and the results should be compared to those given by an exact method (Simplex). We will in a rst phase apply the optimization method to a small sample of Organisational Chart without considering the role of the employees. In a second phase, the role of the employees should be considered and a larger Organisational Chart should be considered.
- Student: Hugo Bocquet, June 30, 2020
- Supervision: Nour Dougui, Selin Atac, Michel Bierlaire
*Enhancing the Serial Estimation of Discrete Choice Models Sequences*- In the past years, an increasing number of studies has investigated the usefulness of data-driven methods for the task of developing discrete choice models so as to alleviate modelers from the burden of manual specification. One of these methods makes use of a variable neighborhood search algorithm to mimic the way an experienced modeler would build the utility functions of a discrete choice model. More precisely, small modifications are sequentially brought to an initial specification, while the induced improvement is assessed by means of a measure of performance. Although the quality of the generated models is high, this method faces a severe limitation: the computational time for a single run counts in hours with relatively small datasets and grows quickly with the amount of considered data. The main goal of this project is to speed up the estimation of DCMs in this precise context.
- Student: Youssef Kitane (SGC), June 22, 2020
- Supervision: Nicola Ortelli, Gael Lederrey, Michel Bierlaire
*Optimal regulation of oligopolistic markets with discrete choice models of demand*- This project is inspired by the ongoing research project titled 'New generation of demand-supply interaction models', funded by the Swiss National Science Foundation. In particular, the project aims at studying models to find optimal policies to regulate markets characterized by oligopolistic competition and in which consumers make a discrete choice among a finite set of alternatives. In this framework, consumers are modelled as utility maximizers, according to random utility theory. Suppliers are modelled as profit maximizers, according to the traditional microeconomic treatment. Market competition is modelled as a non-cooperative game, for which an epsilon-equilibrium solution is sought. Finally, the regulator can affect the behavior of all other agents, for instance by giving subsidies or imposing taxes. In transport markets, these interventions might target specific alternatives, to reduce externalities such as congestion or emissions, or specific segments of the population, to achieve social welfare objectives. The objective of the project is to analyze, implement and evaluate algorithms to solve realistic applications of this problem, with particular focus on the transportation sector.
- Student: Elodie Duliscouet, Paulin Raison, Yahya Basiouny (SGM), June 12, 2020
- Supervision: Stefano Bortolomiol, Selin Atac, Michel Bierlaire
*Robust routing and scheduling in liner shipping*- Large liner shipping companies operate several hundred ships worldwide. These ships carry multi-modal containers on pre-established routes with a regular schedule (typically weekly). A schedule is thus an ordered list of port calls (i.e. stops in a harbour) with associated time windows. Since there are several thousands possible ports in the world, designing routes is a complex problem. Furthermore, since a rotation takes weeks or even months, roughly four journeys out of five end up requiring adjustments to accommodate delays, breakdowns or other unforeseeable but frequent events. Due to the extent of the operations, improving from an adequate schedule to an optimal one may yield enormous benefits, not only economically but also in terms of environmental impact and of quality of life for workers. Given geographical information and demand statistics in the various ports of a network, the project aims at applying Operational Research methodologies to automatically generating shipping schedules that make sense technically, economically and environmentally, as well as resisting perturbations. This project is proposed by Mediterranean Shipping Company (MSC).
- Student: Yannis Voet (SGC), June 12, 2020
- Supervision: Stefano Bortolomiol, Nour Dougui, Michel Bierlaire
*Bayesian analysis of multinomial discrete choice model with t-distributed kernel errors*- This project develops Bayes estimators for two robust alternatives to the multinomial probit models. Both alternative models belong to the family of robit models, whose kernel error distributions are heavy-tailed t-distributions. The first model is the multinomial robit (MNR) model in which a generic degrees of freedom parameter controls the heavy-tailedness of the kernel error distribution. The second alternative, the generalised multinomial robit (Gen-MNR) model, is more flexible than MNR, as it allows for alternative-specific marginal heavy-tailedness of the kernel error distribution. The performance of the proposed estimators is evaluated on simulated and real data.
- Student: Thomas Gasos, June 09, 2020
- Supervision: Rico Krueger, Michel Bierlaire
*Welfare-maximizing design of a transportation system*- The simulation-based linear representation of a discrete choice introduced allows to linearly approximate the expected maximum utility associated with each individual and simulation draw, which provides a measure of consumer surplus. This is of special interest in the case of advanced choice models (e.g., mixture of logit models), as the expected maximum utility presents a highly nonlinear expression. Hence, a linear formulation for the consumer surplus facilitates the derivation of a generalized objective function of some measure of social welfare as the policy objective, which can be employed to assess the performance of different urban transportation policies. The objective of the project is to provide linear (or piecewise linear) formulations to the different aspects that are included in a published non-linear optimization problem, and compare their performance with respect to the original approach, both in terms of computational time and quality of the obtained solution. Additionally, the impact of the assumptions that lead to nonlinear expressions will be evaluated.
- Student: Benjamin Nicolas--Noir, May 29, 2020
- Supervision: Meritxell Pacheco, Michel Bierlaire
*Analysis of the value of demand forecasting within vehicle sharing systems*- Vehicle sharing systems (VSSs) are becoming increasingly popular, primarily due to their financial and environmental advantages. However, VSSs face many operational challenges, including inventory management of vehicles and parking spots, vehicle load balancing and redistribution, pricing strategies, and demand forecasting. If these challenges are not addressed properly, the VSS risks experiencing a significant loss of customers and revenue. Recently, new VSSs have been introduced which use light electric vehicles (LEVs). These systems face a number of unique challenges. For instance, demand forecasting for LEV sharing systems is more complex, as locations are not fixed and journeys can start and end at any allowable location. LEV sharing systems also serve a higher portion of the population since these type of vehicles do not require a driving license. As such, the existing techniques for analysing VSSs are not sufficient for these new systems. To address this need, one needs to forecast the future demand of this novel transportation mode. Since it is exhausting to collect the data to develop a demand model, this project will aim to identify the value of a demand model by using mathematical models tailored for rebalancing operations from the literature and simulations. As LEV systems are still in their infancy, data describing them is not yet available. Therefore, the student will use alternative data, including PubliBike bike-sharing system data, accounting for any potential differences in the analysis. Based on the findings from the literature, the student will analyse different mathematical models.
- Student: Jasso Espadaler (SGC), January 31, 2020
- Supervision: Selin Atac, Stefano Bortolomiol, Michel Bierlaire
*Risk assessment of pedestrian crossings*- Student: Adrien Nicolet (SIN), January 31, 2020
- Supervision: Nicholas Molyneaux, Gael Lederrey, Michel Bierlaire
*Tour-based mode choice modelling*- This project will involve working with real world trip-diary data for London and/or Switzerland to develop sequential tour-based mode-choice models (i.e. where the choice of mode for a trip-leg is dependent on the full tour). The project will involve: � Extracting tour itineraries from the trip-diary data, � Investigating different tour patterns, e.g. primary return-tours, subtours, complex multilegged tours, � Defining different tour-based mode-choice situations which are able to fully represent the tour patterns existing in the data, � Developing appropriate sequential choice models for each mode-choice situation using Discrete Choice Models and/or machine learning.This project will involve working with real world trip-diary data for London and/or Switzerland to develop sequential tour-based mode-choice models (i.e. where the choice of mode for a trip-leg is dependent on the full tour). The project will involve: -Extracting tour itineraries from the trip-diary data, -Investigating different tour patterns, e.g. primary return-tours, subtours, complex multilegged tours, -Defining different tour-based mode-choice situations which are able to fully represent the tour patterns existing in the data, -Developing appropriate sequential choice models for each mode-choice situation using Discrete Choice Models and/or machine learning.
- Student: Adrien Nicolet (SGC), January 31, 2020
- Supervision: Tim Hillel, Janody Pougala, Michel Bierlaire
*Investigating daily activity patterns*- This project will involve working with real world trip-diary data for Switzerland (2015 Mobility and Transport microcensus) to investigate how people schedule activities (e.g. work, lunch, sport, shopping etc) in their day. The project will involve: -Extracting and standardising daily activity schedules from the data, including representing the activity types, locations, start times, and durations with appropriate precision and/or scale, -Establishing a metric to define the similarity (or distance) between different activity schedules, -Using unsupervised machine learning (clustering) algorithms to identify prototypical activity schedules.
- Student: Sergey Gasparovich (SGC), January 31, 2020
- Supervision: Janody Pougala, Tim Hillel, Michel Bierlaire
*Estimation of Discrete Choice Models using HAMABS 2.0*- Improvement of HAMABS for choice modeling estimation using automatic switch.
- Student: Linah Charif (SGC), December 20, 2019
- Supervision: Gael Lederrey, Nicola Ortelli, Michel Bierlaire
*Demand forecasting for a novel transportation mode*- The vehicle sharing systems (VSSs) are becoming more and more popular due to both economic and environmental effects. However, these systems mainly focus on two specific types of vehicles: bicycles and cars. Recently, some other types of vehicles (e.g. light electric vehicles) with some specific properties that distinguish them from cars and bicycles are introduced for use in such kind of systems. Therefore, they lack research in each component of the framework. The aim of this project is to forecast the demand for a novel transportation mode. The student should survey different types of approaches, such as ARIMA, to forecast demand in similar systems and compare them by identifying performance measures. Since the data for this specific transportation mode does not exist yet the student will be directed to use the taxi data, which shares many properties with the system of interest.
- Student: Denis Steffen (SMA), June 30, 2019
- Supervision: Selin Atac, Tim Hillel, Michel Bierlaire
*Calibrating pedestrian control strategies.*- The objective of this semester project is to calibrate two pedestrian control strategies using heuristic methods and/or optimization methods like simulated annealing or genetic algorithms. Two strategies are under investigation: gating to prevent a gridlock situation and flow separators which prevent counter flow. The student will have to use the pedestrian simulator I have implemented and integrate it with an optimization approach like simulated annealing.
- Student: L�opold Bouraux (SIN), June 30, 2019
- Supervision: Nicholas Molyneaux, Gael Lederrey, Michel Bierlaire
*Disruption-caused railway timetable rescheduling problem and its solution*- In railway networks, unexpected disruptions may occur for different reasons and cause delays, service denial, and, consequently, passenger inconvenience. This planned master project will tackle the railway timetable rescheduling problem from a macroscopic and mesoscopic point of view in case of unexpected disruptions. The master project will consider several remediation strategies such as canceling, delaying or rerouting the trains, or introduction of other transportation modes. The other important aspect of the planned master project is its applicability in practice. Hence, the outcome of the project will be the algorithm for timetable rescheduling which will be implemented in the commercial software suite Viriato. The main functionality of Viriato is the train timetabling and it is produced by the company SMA und Partner AG. In order to prepare the candidate for the master project, this pre-study project will include several introductory tasks related to the problem comprehension, solutions approach and algorithm implementation. Therefore, the tasks of this project will be: 1) review of the relevant literature, 2) demand data preprocessing with the purpose of matching infrastructure and demand data, and 3) obtaining the knowledge of the Viriato software and its Algorithm Platform which enables extension of Viriato with third party algorithms.
- Student: Oliver Mathias Buschor, June 21, 2019
- Supervision: Nikola Obrenovic, Meritxell Pacheco, Michel Bierlaire
- In collaboration with SMA und Partner
*Location choice equilibrium - pedestrian demand analysis at EPFL campus*- Modeling location choice is fundamental to understand travel behavior and to predict travel demand in urban spaces. Location choice models are often developed based on the discrete choice framework and allow the analyst to predict to which place (and when) an individual travels. While the location choice behavior has been studied a lot in the city scale, the literature in pedestrian facilities is relatively limited. In this project, we develop a pedestrian location choice model in the EPFL campus, using the data collected from Wi-Fi traces. We start with developing a simple location choice model and test its specications using the sample. Then the student collects additional data of population for aggregate forecasting, i.e. actual demand prediction at each location. Using this technique, we then extend the model to consider the congestion effect. This involves in a fixed point problem to achieve a Nash equilibrium, solved by the nested fixed point (NFXP) algorithm or the nested pseudo likelihood (NPL) algorithm.
- Student: Tianyang Dong (SMA), June 03, 2019
- Supervision: Yuki Oyama, Zhengchao Wang, Michel Bierlaire
*Passenger satisfaction maximization under budget constraints*- This project aims at characterizing a passenger satisfaction application relying on a demand-based optimization framework, which integrates discrete choice models (state-of-the-art for the mathematical modeling of the demand) n Mixed Integer Linear Programming (MILP) models, which are usually considered to address supply decisions such as the price of a service or the number of units to produce of a certain item. This formulation allows us to express passenger satisfaction directly in terms of the expected maximum utility of the future scenario, which simplifies notably the common representation relying on the consumer surplus. The objective is the maximization of the passenger satisfaction in a short-distance commuting context while accounting for different settings with respect to road tolling and investment in public transportation.
- Student: Tatiana Moavensadeh-Ghasnavi, June 03, 2019
- Supervision: Meritxell Pacheco, Yuki Oyama, Michel Bierlaire
*Dynamic optimization of self-service vehicles*- This project is a pr�-�tude project that will prepare the student to working on the Master thesis. The proposed topic is related to the dynamic optimization of self-service vehicle fleets, with a possible focus on dynamic pricing.
- Student: Mohamed Detsouli (SGC), January 31, 2019
- Supervision: Stefano Bortolomiol, Nikola Obrenovic, Michel Bierlaire
*Railway infrastructure maintenance*- Following this summer tragedy in Genoa, Italy, European states and governments became more aware of the importance of keeping their countries� infrastructure modern and maintained. This interdisciplinary project will particularly focus on the topic of railway infrastructure maintenance and will cover some legal, economic, social, political aspects related to this socio-economic problem. The goal of this project is to study the topic of railway infrastructure maintenance from two perspectives. Initially, a qualitative analysis will be performed to precisely define the scope of the research and the main factors that affect the planning of investments to maintain railways infrastructures. Based on the findings of the qualitative analysis, the students will then critically analyze existing mathematical models that generate maintenance schedules and optimal railway investments, and will propose a framework which will be applied on a real-life case study.
- Student: Ludovica Sessa and Robert Abboud (SMGT), January 31, 2019
- Supervision: Stefano Bortolomiol, Selin Atac, Michel Bierlaire
*Passage au 1/4h de l'exploitation du FMA*- Les Transports Public Fribourgois (TPF) exploite la ligne � voie normale Fribourg-Morat-Anet (FMA). Les trains assurant ce service utilise les voies des CFF � Fribourg, entre Fribourg et Givisiez, � Morat, entre Morat et Muntelier et les voies du Bern-Neuch�tel (BN) expoit� par les BLS � Anet. L'horaire de cette ligne est donc difficile � mettre en place. Le projet consiste � proposer une offre au 1/4h sur toute la ligne et/ou une offre combin�e en pseudo-1/4h en alternant des trains REG et RE. Les mesures d'infrastructures seront mises en �vidence.
- Student: F�lix Boesch (SGC), January 31, 2019
- Supervision: Daniel Emery
*Variantes d'horaires sur la tangentielle Nantes-Lyon*- Environ 69% de la longueur de la tangentielle ferroviaire Nantes-Lyon sont aujourd'hui �lectrifi�s en 25kV/50Hz et 9% en 1,5kV=. Toutefois, les 143 km s�parant St.Germain-des-Foss�s � St.Germain-au-Mt-d'Or restent non �lectrifi�s. Le projet consiste � d�velopper des variantes d'horaires entre Nantes et Lyon en tenant compte notamment des correspondances dans les noeuds de Nantes, Angers, Tours et Bourges. La probl�matique des correspondances avec Clermont-Ferrand sera prise en compte et l'insertion des circulations dans le noeud lyonnais sera sommairement analys�e. Les �ventuelles difficult�s pour cette tangentielle � fournir � la fois une succession de services relativement locaux et une desserte de bout en bout performante seront mises en �vidence.
- Student: Axel Valentin Gabriel Curis (SGC), January 31, 2019
- Supervision: Daniel Emery
*Exploitation optimale de la ligne � voie m�trique des TPF Pal�zieux-Bulle- Montbovon*- La ligne des TPF � voie m�trique Pal�zieux-Bulle-Montbovon doit offrir de bonnes correpondances dans ces trois noeuds ferroviaire. Le projet consiste � proposer des horaires optimaux en fonction des variantes d'horaire CFF entre Pal�zieux et Fribourg d'une part et de l'exploitation MOB (Montreux-Oberland Bernois) d'autre part. Une desserte plus dense au Sud de Bulle et certains prolongements jusqu'� Chateau d'Oex peuvent �tre envisag�s, en fonction des besoins et des temps de rebroussement disponibles.
- Student: Fabien Jacot-Descombes Jonas Gschwend (SGC), January 31, 2019
- Supervision: Daniel Emery
*Formulating and solving a dial-a-ride problem*- The Dial-a-Ride Problem (DARP) is a problem to design a vehicular route and schedule, given the passenger requests that are characterized by origins (pickup points) and destinations (delivery points) often with the time windows. In recent years, solving the DARP is increasingly demanded, re ecting new technologies for mobility. On-demand transportation for elderly or disabled people is a typical example of application. The project is mainly dedicated to the following specific tasks. First, the literature review will be done so that the student gets familiar with the model concepts and formulations of the DARP. The student is expected to understand the difference among several types of models, such as between static and dynamic models, or between single-vehicle and multi-vehicle models. At the same time, the solution methodologies that are relevant to each type of DARP will be investigated. Second, the student should acquire the basic skills for optimization problem. Though several exercises, she will get used to coding and using appropriate softwares for solving the problem. Given the knowledge and skills, finally, she should define a DARP for a specific example. The problem will be solved by at least two methodologies and be analyzed.
- Student: Rym Karime (SGC), January 31, 2019
- Supervision: Yuki Oyama, Nour Dougui, Michel Bierlaire
*Optimal taxi charging decision given the real-time charging station and taxi states and future uncertainties*- This project aims at optimizing the charging decision of taxi drivers. Different from conventional taxi drivers, electric taxi drivers are more influenced by their refuelling strategy. This is because the refuelling process of electric taxis is longer than conventional taxis, especially in the case that electric taxis need to wait before charging. This longer charging duration will decrease the serving time of electric taxis which will, in return, influence the profits of electric taxis. Therefore, an intelligent charging decision strategy which can help electric taxis to charge optimally (maximizing the profit of taxi) is highly desirable. To build the optimal charging decision program, we assume that a taxi will make a decision at each time step. When the taxi drivers make a decision, we assume that the taxi driver knows that, in the future hours, what are the expectation and variance of revenue during each time period (let's say 30 minutes). In addition to that, the taxi driver also knows the exact position of charging station and the chargers that are installed in the station. Besides, we also assume that the taxi driver also receives information about the availability of chargers from all stations by the time he makes a decision. Moreover, the taxi driver also has a prediction of the congestion condition of the charging station in the following hours. Based on the above assumption, the taxi drivers make his charging decision at each time step, i.e. charge or not, if charge, where, and when to charge for how much. The students who work on this project should build an optimization program which can make the charging decision for the taxi driver. This project is composed of two stages. First, the students will look into the taxi tracking data to understand the taxi request characteristics. This includes the mean and variance of a taxi running distances and revenue from served taxi demands across the taxis. After, the students will learn to come up with an optimization program which can help the taxi drivers to make the charging decision given the current states of taxis and its knowledge about the future world.
- Student: Julien Johan Haan (Section of GC), Loic Senser (Section of MTE) (SGC), January 25, 2019
- Supervision: Zhengchao Wang, Yuki Oyama, Michel Bierlaire
*Towards a techno-economic evaluation framework for regional train propulsion architectures*- Railway can be the most environmental mode for land transport. However the sector faces cost challenges. Apart from main routes, tracks are often not electrified, requiring pollutive and operational expensive diesel propulsion systems. In contrary to road vehicles, there are no commercial large-scale applications of hybrid drivetrains. Furthermore, the dependencies of hybrid drivetrains on energy supplying infrastructure, like overhead wires or recharge points, has not been researched yet. In order to assess the potential of hybrid drivetrains holistically, the project Toolbox for Optimal Railway Propulsion Architectures (TORPA) has set up a framework to define drivetrain solutions, optimize them, and compare them among each other. Prior to this semester project, 58 drivetrain architectures have been defined. One of them was optimized toward the objectives of driving CO2 emissions and investment costs, on a specific use case. However, these bare results were inconclusive and expensive to compute for more than one use case. In this semester project, we downselect the number of possible architectures, outlining the currently most relevant ones. Furthermore, we include infrastructure requirements in the definition of architectures. The metric of investment cost is extended to display the full life cycle costs of architectures. The model of driving CO2 emissions is attempted to display all vehicle life cycle emissions, but left at the current state after qualitatively stating significant CO2 contributors not included in the calculation models. In order to assess the potential of the extended framework, it was required to state test cases, define tangible experiments, and prioritize them. Previously, it is researched which parameters should be chosen to be relevant for such experiments. Thereby, representative generic test tracks are conceived. We choose the question of viability of track electrification as first test case for the software framework. Thus, the currently operating vehicle architectures for diesel or full electric operation are applied. Especially the impacts of currently existing electrification infrastructure and track parameters, like distance and stop frequency, are investigated. Firstly, we imply a track with average constitution and operation. It is found, that the break even of track electrification is reached when a third of it is already electrified due to e. g. intersection with other tracks. Furthermore, we find that stop frequency is decisive for electrification break even: Tracks with shortened stop distance may be cheaper to be operated electrically, even if there is no catenary infrastructure built up yet.
- Student: Florian Mueller, January 22, 2019
- Supervision: Nour Dougui, Nikola Obrenovic, Michel Bierlaire
*Goodness of fit in DCMs*- In these last years, with the arrival and wide-spreading of Big data, the discrete choice modeling community has gained access to larger datasets, more computing power and the possibility to drastically increase model complexity. It has therefore become crucial to establish precise measures of the goodness of fit as well as techniques to detect and reduce overfitting. We propose to apply known techniques from machine learning � such as cross-validation � to discrete choice models. We investigate the existence of overfitting in discrete choice models using a linear and a polynomial multinomial logit model on the Optima dataset. We adopted a train-test approach to evaluate model performance. Model estimates for both models were computed on N = 100, 200 and 500 runs of random train-test splits, using an 80-20 ratio. The results show that the polynomial model has better fit on the training samples, but performs worse than the linear model on the testing set, indicating the presence of overfitting. The use of K-fold cross-validation for simple multinomial logit models has also been explored. However, model estimates obtained using K-fold cross-validation did not differ from the model estimates estimates obtained from a single model fitting, due to underfitting. The distributions of the results obtained on the Optima dataset motivated the exploration of an empirical hypothesis test to determine the presence of overfitting. The test is based on the assumption that training and testing samples of a model which is not overfitting will have the same mean. This test was implemented using the t-test for two samples with unequal variances, also known as Welch test. This empirical test presented in this report did not differentiate the models in terms of overfitting. However, it could be a starting point of our future research, which will be aimed at establishing a statistical definition of overfitting.
- Student: Jessica Hopkins (SMA), December 21, 2018
- Supervision: Gael Lederrey, Michel Bierlaire, Nicholas Molyneaux
*Optimization of school accessibility in developing countries*- The Global Program for Safer Schools (GPSS) focuses on risks linked to education infrastructure. The program aims to save lives and reduce the physical impact of disasters on school infrastructure. We are working with the Kyrgyz Republic Government to improve the capacity to respond to disasters, providing safer and quality learning environment for children, and managing the cost of disasters and climate shocks. This semester project/master thesis proposes a methodology to optimize educational infrastructure networks based on accessibility; and proposes solutions to improve the performance of educational infrastructure networks. In other words, it optimizes the location and the dimension of school buildings. Several factors are included such as transportation network, home location of the students and mobility patterns. The results is a methodology to suggest investments to reduce the risks in case of disaster. The cities of Bishkek in the Kyrgyz Republic is used as a case study. Methodologies from optimization, programming (Java) and geographical information system (GIS) will be used for completing this project.
- Student: Yassine El Ouazzani, Oliver Mathias Buschor (SGC), December 21, 2018
- Supervision: Riccardo Scarinci, Meritxell Pacheco, Michel Bierlaire
- In collaboration with World Bank
*Locating charging station for electric taxis*- This project aims at locating the position of charging station for electric taxis. Currently, transportation is transforming to be more sustainable. The electric vehicle is a promising way to achieve such a goal. However, charger unavailability is among one of the main issues that hindered the adoption of the electric vehicle. To contribute to mitigating such issue, this project is dened accordingly to optimize the charging station location. The location problem is a classic problem in the operational research domain. It is usually solved using a p-median, p-mean, set covering, or flow covering method. The goal of this research is to apply these methods to decide the location of charging stations in San Francisco using taxi tracking data and compare the dierence in the end. This project is composed of three stages. First, the student should work on mapping the taxi tracking data on the map using map-matching techniques. Then, the student should apply point-based location methods (p-median, p- mean, set-covering) to find the optimal location. The student is not required to apply all the relevant methods but chooses one or two in which he is interested. After, the students will apply and characterize a flow-based method. Finally, an analysis of the results is performed to evaluate the results obtained.
- Student: Oliver Mathias Buschor, Younes Bensaid, December 21, 2018
- Supervision: Zhengchao Wang, Meritxell Pacheco, Michel Bierlaire, not applicable
*Sustainable & intelligent transportation evaluation and plan*- This project is composed of two stages. First, the student will search for and make a summary of emerging transportation technologies that are proposed in both literature and industries. After, the student will learn to come up with feasible and promising transportation systems composed of the emerging technologies, and then quantitatively evaluate the proposed systems based on travel demand simulations.
- Student: David Gunter, July 20, 2018
- Supervision: Zhengchao Wang, Yuki Oyama
*Cost Reduction Uisng Passenger Centric Timetabling*- "To design their timetables, train-operating companies mostly focus on operational aspects and cost. In Switzerland, a paradigm of transportation planning is to create regular-interval timetables (a.k.a. cyclic timetables) which aim for maximal transfer connections, simplicity and hence user friendlyness. SBB uses travel simulation models to predict the impact of timetable changes on travel demand and revenue. Mathematical timetable optimization methods are not yet used by SBB. But a recent EPFL thesis (2016) shows that the timetable itself has a significant impact on the performance of the operator in terms of the number of transported passengers: a timetable design that considers the behavior of passengers leads to higher revenue(s), market share(s), higher value of passenger-km etc. In this project, the aim is to use the optimization methods developed by the TRANSP-OR Lab consisting in combining cyclic and non-cyclic timetables and apply it to the Swiss Federal Railways� timetable design. The goal is to evaluate the performance of the current Swiss interval timetable and to compare it to the optimal one. Suitability of hybrid timetables for the Swiss railway network will be investigated".
- Student: Robert Abboud (SMGT), June 29, 2018
- Supervision: Virginie Lurkin, Michel Bierlaire
*Design of a stated-preferences survey for a high-speed vacuum transportation mode*- Since the high-speed vacuum transportation technology represents an innovative transportation mode, it is necessary to obtain data from surveys of hypothetical market/situations, the so-called stated-preferences (SP) surveys. The goal of this project is to design an SP questionnaire to evaluate the impact of this innovative transportation mode and to measure some indicators (such as the willingness-to-pay). A pilot test of the preliminary survey in a small sample will be carried out in order to evaluate the quality of the questionnaire. The main findings will be used to define the final survey that will be distributed to a representative sample of the population by a specialized company.
- Student: Thibaut Richard et Mart� Montesinos Ferrer, June 20, 2018
- Supervision: Meritxell Pacheco, Yuki Oyama, Michel Bierlaire
*Modelling competition in demand-based optimization models*- The project aims at studying and understanding the interactions between supply and demand in an oligopolistic market, in which multiple operators compete for the same pool of customers. This is a common situation in the transportation sector as well as in other markets. Operators take the supply-side decisions that optimize their own performance function (e.g. maximization of revenues or profits). Such decisions are influenced both by the decisions of their competitors and by the preferences of the customers who consider purchasing one of the services offered on the market. The latter ones are modelled at a disaggregate level according to the random utility theory. The starting point of the project is a recent modelling framework that allows to include any random utility model in a mixed integer optimization formulation. In this framework, a single operator exploits its knowledge of the demand to maximize its objective function, while assuming that the decisions of its competitors are held fixed. The goal of this project is to extend the existing framework by including the case in which two operators simultaneously optimize their decisions. Such problem falls into the category of competitive games called two-player non-cooperative games. The student will refer to the concept of Nash equilibrium to answer questions such as "how does competition affect prices?", "what products should each competitor offer and in which quantity?", "should two competitors fight to attract the same group of customers or should they each target a different market segment?", among others.
- Student: Charlotte Darn� (SMA), June 19, 2018
- Supervision: Stefano Bortolomiol, Virginie Lurkin, Michel Bierlaire
*A solution approach for the Multicommodity Flow Problem within rail freight transportation*- This project aims at studying the Multicommodity Flow Problem (MFP), which has several real life applications, particularly within the transportation sector. The project has been inspired by an ongoing research project conducted by TRANSP-OR in collaboration with SBB Cargo. In the context of railway freight operations, companies have limited availability of both railway lines and trains. Therefore, they have the goal to optimize as much as possible the usage of their resources in order to minimize the cost of transporting the goods. Such optimization problem can be modelled as a MFP. This project is composed of two stages. First, the student will learn the mathematical model of the MFP, in its two variants: node-arc formulation and path-based formulation. The two variants will be coded and tested on small instances by using a Mixed-Integer Linear Programming (MILP) solver such as CPLEX. Further, the student will implement a solution method to solve larger instances of the problem, by using either an exact method (such as column generation) or a heuristic method.
- Student: Nicolas Pradignac (SIN), June 19, 2018
- Supervision: Stefano Bortolomiol, Nikola Obrenovic, Michel Bierlaire
- In collaboration with SBB Cargo
*Development of a heuristic algorithm for a hub location problem*- In railway networks, the location of marshalling and shunting yards, i.e. facilities used for sorting and consolidation of transported goods, determines the costs of cargo transport to a great extent. Hence, each railway company is highly motivated to determine the optimal location of these yards. Such task can be represented as a multi-level facility location problem or a hub location problem. The aim of this project is the development of an heuristic algorithm for solving a facility location problem with facilities split in multiple hierarchical layers. The project will be a part of a larger research project done in the cooperation with SBB. The student will start from understanding the exact mathematical model of the mentioned problem and encode it into a heuristic algorithm, e.g. a local search algorithm or VNS. Also, the student will have to solve the problem on a smaller data set using an exact method and compare the solution with the results of the heuristic algorithm. The student needs to have good programming skills (Java or some other OO language) and knowledge of mixed integer linear programming and heuristics.
- Student: Thibaut Guillaume Marie Richard, June 19, 2018
- Supervision: Nikola Obrenovic, Nicholas Molyneaux, Michel Bierlaire
- In collaboration with SBB Cargo
*Safer schools thanks to an improved transport access in developing countries*- The Global Program for Safer Schools (GPSS) focuses on risks linked to education infrastructure. The program aims to save lives and reduce the physical impact of disasters on school infrastructure. We are working with the Kyrgyz Republic Government to improve the capacity to respond to disasters, providing safer and quality learning environment for children, and managing the cost of disasters and climate shocks. This semester project/master thesis proposes a methodology to assess and optimize educational infrastructure networks based on accessibility; and proposes solutions to improve the performance of educational infrastructure networks. In other words, it evaluates the risks based on the school network, including parameters like transportation network, home location of the students and mobility patterns. The results is a methodology to suggest investments to reduce the risks in case of disaster. Two case studies will be carry on in the cities of Bishkek and Osh in the Kyrgyz Republic. Methodologies from transportation studies, geographical information system (GIS) and programming will be used for completing this project.
- Student: Zora Oswald, June 16, 2018
- Supervision: Riccardo Scarinci, Meritxell Pacheco, Michel Bierlaire
- In collaboration with The World Bank
*Conduite Automatique des Trains entre Neuch�tel et La Chaux-de-Fonds*- L'European Train Control System Level 2 (ETCS_L2) autorise la conduite automatique des trains via le "paquet 44". Le projet consiste � introduire dans ce "paquet" l'ensemble des instructions n�cessaires pour aller, en conduite automatique, de A � B tout en conservant un conducteur � bord (GoA2). Le parcours entre Neuch�tel et La Chaux-de-Fonds via un nouveau trac� servira de "d�monstrateur".
- Student: Guillaume Sauvin (SGC), June 08, 2018
- Supervision: Daniel Emery
*Usage d'un sous-cantonnement pour densifier la circulation aux abords d'un noeud ferroviaire important*- Le projet consiste, sur un d�coupage des cantons en sous-cantons virtuels, � faire circuler plusieurs combinaisons de trains � signalisation lat�rale et de trains � signalisation en cabine (ETCS_L2/3) pour d�terminer les gains en d�bit pouvant �tre attendus.
- Student: Clo� Lafaye, June 08, 2018
- Supervision: Daniel Emery
*Offre nationale ferroviaire 2035 avec un tron�on SwissMetro*- Le projet consiste, notamment, � d�velopper des sc�narios de r�seau pour le mode de transport SwissMetro, � en d�finir les caract�ristiques principales ainsi qu'un ordre de priorit� de r�alisation des tron�ons. Dans une seconde �tape, l'horaire GK12 sera adapt� pour tenir compte de la pr�sence du tron�on-pilote du(des) sc�nario(s) le(s) plus prometteur(s). Une comparaison exhaustive des avantages/inconv�nients des horaires GK12 original et GK12 modifi�(s) cl�turera ce travail.
- Student: Lauriane Masson (SGC), June 08, 2018
- Supervision: Daniel Emery
*Augmentation de la r�serve de capacit� m1 des TL par actions limit�es au mat�riel roulant*- Le m�tro m1 des Transports Publics Lausannois (TL) relie le Centre-Ville de Lausanne � la Gare de Renens situ�e dans l'Ouest Lausannois en passant notamment par l'Universit� (UNIL) et l'�cole Polytechnique F�d�rale de Lausanne (EPFL). En heure de pointe en p�riode estudiantine il circule avec des intervalles de 5 minutes, soit les intervalles les plus faibles possibles compte tenu de l'infrastructure actuelle � simple voie. Depuis de nombreuses ann�e, de nombreuses mesures touchant la demande ont �t� prises en vue de r�duire les pointes afin de d�-saturer cette ligne (d�calage des heures de d�but de cours entre UNIL et EPFL, nouvelle ligne de bus passant par Renens-Gare et les Hautes �coles, �). Toutefois, avec la croissance continue de la population se rendant sur les sites universitaires, la saturation se profile � moyen terme. Cette pr�-�tude de master quantifiera l'apport des moyens d'actions pour accro�tre la capacit� du mat�riel roulant sans avoir a modifier l'infrastructure.
- Student: David Moy de Vitry (SGC), June 08, 2018
- Supervision: Daniel Emery
*Qualit� de l'offre nationale des projets d'horaire EA2030 et EA2035*- Des deux projets d'horaire nationaux (EA2030 et EA2035) sont � disposition des d�cideurs pour choisir entre deux variantes d'am�nagement du r�seau ferroviaires suisse. Le projet consiste � notamment � �valuer la qualit� de l'offre nationale offerte par ces projets en terme de temps de parcours et de fr�quence, l'horaire 2018 servant de r�f�rence. Les valeurs absolues et relatives des crit�res retenus (temps de parcours, fr�quence, nombre de correspondance, ...) seront notamment dispos�es sous la forme de matrice OD, chaque O(resp. D) �tant une gare significative sur la plan d�mographique et politique (p.ex. chef-lieu de canton)
- Student: Zora Oswald (SGC), June 08, 2018
- Supervision: Daniel Emery
*Offre nationale ferroviaire 2035 avec tron�ons SwissMetro*- Un projet d'horaire ferroviaire national 2035 a �t� publi� avec les am�nagements des infrastructures n�cessaires exploiter un tel horaire. Le projet consiste � d�velopper des variantes de r�alisation de tron�ons SwissMetro. Pour chacune de ces variantes il sera recens� les am�nagement d'infrastructure pr�vus devenant superflus d'une part, et le projet d'horaire 2035 sera alors adapt� � la pr�sence de ces tron�ons d'autre part. Les avantages/inconv�nients de chaque variante seront compar�s, le projet d'am�nagement 2035 et l'horaire 2035 sans SwissMetro servant de r�f�rence.
- Student: Lauriane Masson (SGC), June 08, 2018
- Supervision: Daniel Emery
*Automatic utility specification using machine learning techniques*- The objective of this project is to help building a utility function using different Data Analysis functions. It is well known that modeler spend a lot of time creating their utility function for DCMs. The goal of this project is to build an automated procedure to generate Utility functions based on the data. The tools used are Data Analysis and Machine Learning (Decision Tree, Random Forest, Linear Regression, Clustering, etc.). The utility functions found using these tools will then be compared to standard and more advanced utility functions. Another direction that we can take is using Machine Learning to extract the possible nests for a Nested Logit Model. This direction, however, requires a deeper knowledge in Discrete Choice Modelling. We are open to the discussion concerning the available directions.
- Student: Nicola Ortelli, June 08, 2018
- Supervision: Gael Lederrey, Tim Hillel, Virginie Lurkin
*Building offline and online optimization algorithms for dispatchment of teams at Nez Rouge.*- Nez Rouge (http://nezrouge.ch) is a swiss charitable association with the purpose of driving people back home safely during the cold nights of December. They have to find many volunteers across the whole country and the demand never stops growing. Instead of helping them find new volunteers, I propose to solve one difficult task: dispatching efficiently the volunteers, the idea being to reduce the waiting-time of customers. Using data provided by Nez Rouge, we will first build an offline optimization problem to find a lower bound on the estimated waiting-time and compare it to the actual waiting-time. The second step will be to build an online optimization problem using the API of OpenStreetMap to solve this problem in real-time. The third and final step will be to build a webpage for the volunteers at Nez Rouge. Note: This project can be done as a master project or split between multiple semester projects, depending on the number of credits you have to do.
- Student: Colin Ducommun, June 08, 2018
- Supervision: Gael Lederrey, Nicholas Molyneaux, Michel Bierlaire
*On the optimization of CAPEX and OPEX for the design of a full electric large capacity urban bus system*- During the last few decades, environmental impact of the fossil fuel-based transportation infrastructure has led to renewed interest in electric transportation infrastructure, especially in urban public mass-transportation sector. The deployment of battery-powered electric bus systems within the public transportation sector plays an important role to increase energy efficiency and to abate emissions. RAn efficient feeding stations installation and an appropriate dimensioning of battery capacity are crucial to minimize the total cost of ownership for the citywide bus transportation net- work. The objective of this project is to extend an existing optimization model to the multiple lines case and to come up with an objective function that better reflect the real costs incurred by the operator. The objective function should include Capital Expenditures (CAPEX) and Operational Expenditures (OPEX). For the multiple line case, the central issue is to deal with the feeding stations that are shared among different lines.
- Student: Guillaume Mollard (CSE), January 31, 2018
- Supervision: Virginie Lurkin, Stefan Binder, Michel Bierlaire
*Integrating demand and supply in the context of airlines*- Student: Thibaut Richard et Gabriel Curis (SGC), January 24, 2018
- Supervision: Meritxell Pacheco, Anna Fernandez Antolin, Michel Bierlaire
*Infrastructure ferroviaire entre Lausanne et Gen�ve � l'horizon 2030*- Le projet consiste � d�terminer les infrastructures n�cessaires et les horaires possibles sur la ligne Lausanne-Gen�ve � l'horizon 2030. Un projet d'offre 2030 pr�voit pas moins de dix paires de trains voyageurs (4 IC, 2 IR, 4 RE). L'OFT pour sa part souhaite qu'une paire de trains marchandises au minimum puisse circuler chaque heure.
- Student: Clo� Lafaye et Julien Thiriot (SGC), January 12, 2018
- Supervision: Daniel Emery
*Offre 2030 entre Berne et Lausanne r�pondant aux attentes des cantons (BE, FR et VD)*- Student: Beno�t Corday (SGC), January 12, 2018
- Supervision: Daniel Emery, Jean-Daniel BURI
*Am�nagements futurs du complexe ferroviaire de Clermont-Ferrand*- Le travail consiste premi�rement � �tablir un �tat des lieux (plan et caract�ristiques des voies, postes d�aiguillages, IFTE, GOV, types de mouvements et volum�trie, roulements de mat�riel, �quipements de maintenance et de remisage, etc.) Une analyse de l�ad�quation des �quipements aux besoins engendr�s par le remplacement des rames tract�es par des rames automotrices sera alors men�e; et d��ventuelles mesures seront propos�es. Si le temps le permet, les cons�quences sur les GOV de Clermont seront estim�es si un sc�nario ambitieux d��lectrification devait voir le jour autour de Clermont (Volvic/Le Cendre/Aulnat). de r�f�rence.
- Student: Axel Valentin (SGC), January 12, 2018
- Supervision: Daniel Emery
*Mobilit� lors des JO d�hiver et perspectives pour Sion 2026*- La pr�-�tude se propose premi�rement de recenser les d�marches d�organisation de la mobilit� lors de JO pr�sent�es par les villes candidates r�centes, notamment Sion 2002 et Torino 2006, et de d�terminer et de r�colter les valeurs dimensionnantes de mobilit� en lien avec les diff�rentes disciplines sportives. Dans une seconde partie, la pr�-�tude se focalisera sur le cas de la ville candidate Sion 2026. Elle pr�sentera en particulier un panorama de l�offre TP actuelle pour atteindre actuellement les sites retenus, ainsi que l�offre envisag�e par le programme PRODES 2025. Le Projet De Master (PDM) proprement dit cherchera premi�rement � atteindre les objectifs de la pr�-�tude non totalement atteints. Son objectif principal sera de g�n�rer des concepts d�offre TC, voire m�me des variantes d�horaires. Les lignes � �tudier plus particuli�rement seront choisies en f�vrier 2018. La liste de ces lignes, non exhaustive, comporte notamment les lignes � ext�rieures � (�Olympic Ring�, raccords aux a�roports internationaux GVA et ZRH) et les lignes � int�rieures � au Valais (Brig-Ulrichen, Martigny-Le Ch�ble,).
- Student: Cl�ment Sintes (SGC), January 12, 2018
- Supervision: Daniel Emery, Stefano MANELLI Pierre FAVRE
*From public transport vehicles to pedestrian flows.*- The objective of this semester project is to extend the notion of "train induced flows" to other modes of public transport. When public transport vehicles arrive in the station, many passengers disembark. From the infrastructure's point-of-view, there is a flow of pedestrians arriving. The characteristics of such flows depend on the vehicle's characteristics (door width for example) and the characteristics of the infrastructure (width of the corridors for example). The student will explore the different interactions and characterize the different flows by using models similar to the "train induced flows" model, already published. The specifications will be different based on the various modes and platform setups. The second objective is to explore the feasibility of using a Poisson distribution to model the pedestrians arriving onto platforms. Similarly to alighting flows, different configurations can lead to different model specifications. The student will start by exploring the literature then, based on the pre-existing models, some new formulations can be proposed. Data is available for calibration of pedestrian flows boarding trains. Synthetic data can be used for the calibration of other models. This project can be done during the spring 2018 semester.
- Student: Rodolphe Farrando, January 12, 2018
- Supervision: Nicholas Molyneaux, Gael Lederrey, Michel Bierlaire
*Alternative activity pattern generation for stated preference surveys*- Student: Nicola Marco Ortelli (SGC), December 22, 2017
- Supervision: Anna Fernandez Antolin, Gael Lederrey, Michel Bierlaire
*Identifying the objectives of car drivers route choice behavior*- The goal of this project is to shed light on the underlying objectives of car drivers' behavior --- pertaining to their route choices --- when traveling from one location of a transportation network to another. The student will use clustering methods, defined on the basis of different measures of similarity, that are associated with potential objectives such as the minimization of the travel time, the length or the complexity of a route. The results of the clustering will be analyzed to draw insights into the use of specific objectives depending on the features of the trip, such as the origin and destination points, and the departure time. The project involves an initial stage of data processing. The student needs to have good programming skills (Matlab or equivalent) and good knowledge of statistics. Familiarity with SQL is a plus.
- Student: Nicola Marco Ortelli, December 22, 2017
- Supervision: Evanthia Kazagli, Marija Nikolic, Michel Bierlaire
*Analysis of pedestrian group behavior based on tracking data and pattern recognition methods*- The objective of this project is to analyze the group behavior among pedestrians based on individual trajectory data. The data is collected in Lausanne train station, where a large-scale network of smart sensors has been used to track pedestrians. The project aims to improve the understanding of group behavior among pedestrians and its impact on pedestrian dynamics. It involves the following steps: (i) Development/selection of suitable methods (e.g. data mining/pattern recognition) for identification of individuals walking together, based on pedestrian trajectory data, and their implementation. (ii) Analysis focused on the behavior of identified groups; (iii) Comparison of the findings with the existing empirical basis, as well as with the proposed theories and models that take group dynamics into account. The student needs to have good programming skills (Scala/Matlab), and knowledge of statistical analysis.
- Student: Montesinos Ferrer Mart�, December 22, 2017
- Supervision: Marija Nikolic, Evanthia Kazagli, Zhengchao Wang
*Modeling purchases of new cars for 2015: a comparison between countries*- We are interested in analyzing the behavior of people when they face the decision to buy a new car. We have a large dataset containing information of new car purchases, where respondents answered to several questions related to their socioeconomic characteristics and to the attributes of their recently purchased car. We have developed a framework that has been applied to the data corresponding to France in 2014. The objective of this semester project is to apply it to 2015 for several countries (France, Germany, Italy and Spain) and to obtain and predict market shares in each of the countries as well as to compute willingness to pay towards different attributes. Moreover, the student will analyze the difference between the different countries and between the different years.
- Student: Mart� Montesinos (SGC), June 19, 2017
- Supervision: Anna Fernandez Antolin, Meritxell Pacheco, Michel Bierlaire
*Planning of feeding station installment for a full electric large capacity urban bus system*- The integration of customer behavioural models in optimization provides a better understanding of the preferences of clients (the demand) to policy makers while planning for their systems (the supply). These preferences are formalized with discrete choice models, and the corresponding optimization models where supply and demand closely interact are associated with (mixed) integer optimization problems. One concrete application of this integration consists of an operator selling services to a market, each service at a given price to a finite number of customers, called the capacity of the service. We are interested in finding the best strategy in terms of pricing and capacity allocation in order to maximize the revenues of the operator. The project objectives can be tailored for both Master or Semester project students.
- Student: Adrien Ruault (SIN), June 16, 2017
- Supervision: Virginie Lurkin, Marija Nikolic, Michel Bierlaire
*Speed profile of an innovative catenary-free electric bus*- The TOSA bus system is a revolutionary catenary-free electric bus concept that includes small short-range on-board batteries and a series of fully automated fast charging stations installed at some bus stops. The automatic fast-charging stations partially replenish the bus batteries in a few seconds whenever a bus arrives at the bus stops, while avoiding any interference with the bus schedules and operations. This system has been defined during the project myTOSA 1.0 and implemented in a pilot test in the city of Geneva in 2013. The project myTOSA 1.0 is currently extended by the project myTOSA 2.0. myTOSA 2.0 is composed of several modules, the most relevant for this semester project is the traffic simulation. The traffic simulation represents the movement of the buses in a network, and requires a representation of the infrastructure as an input. This project aims to define the typical speed profile of an electric bus moving in an urban network. The speed profile includes acceleration and deceleration patters for different driver behaviour, network configurations and traffic levels. The influence of traffic lights, bus priority, roundabouts on the speed profile should be investigated. The first step to achieve this aim is to define the probability distribution of the number of intersections crossed by the bus. This step is necessary to complete this project successfully. Further steps in the directions of the definition of the speed profile are considerate optional. Methodologies from transportation modelling, geographical information system (GIS) and programming (MATLAB) will be used for completing this project.
- Student: Valentin Axel Olivier & Nicolet Adrien (SGC), June 16, 2017
- Supervision: Riccardo Scarinci, Virginie Lurkin, Michel Bierlaire
*Organisation de l�am�lioration de la performance de l�offre ferroviaire dans les m�tropoles d�Auvergne Rh�ne Alpes: Retour d�exp�rience du n�ud ferroviaire lyonnais et enseignements � tirer pour les autres m�tropoles*- L��tat fran�ais et SNCF R�seau ont sign� un contrat de performance permettant de donner une trajectoire financi�re pour la d�cennie � venir et qui demande d�organiser l�am�lioration de la performance, notamment de la r�gularit�. D�autre part, dans le cadre de Sch�ma R�gionaux d�Am�nagement, de D�veloppement Durable et d�Egalit� des Territoires (SRADDET), SNCF R�seau entend positionner l�infrastructure ferroviaire comme v�ritable pivot de la mobilit� au niveau r�gional. L��tude (pr�-�tude et travail pratique de Master) doit permettre de s�approprier les m�thodes de travail utilis�es pour le NFL ( audit, diagnostic, bilan des circulations, mobilisation des acteurs internes ou externes �) et les outils correspondants permettant � tous les acteurs de participer � l�am�lioration de la performance en appliquant des plans d�action � court et moyen terme ( organisation du projets, identification des phases d�cisives, formalisation ders plans d�action, ...) Une analyse dans la coh�rence des plans d�action court terme mais �galement long terme sera d�velopp� en prenant en compte la stabilit� des �volutions des hypoth�ses de l�offre ferroviaire. La m�thode de travail ainsi conceptualis�e par un travail personnel et autonome et une reformulation des facteurs cl�s de succ�s et les outils correspondants seront appliqu�s, � titre de � d�monstration � pour la m�tropole grenobloise ou clermontoise. Des plans d�actions � court, moyen et long terme seront d�duits et propos�s
- Student: Jean-Baptiste Landes (SGC), June 09, 2017
- Supervision: Daniel Emery
*Emotions and risky discrete choices*- This CSE project aims at understanding, analyzing and quantitative modeling of the roles of emotions in risky choice making
- Student: Le Sueur C�cile Christianne Anny D�borah Suzanne (SMA), June 02, 2017
- Supervision: Matthieu de Lapparent, Michel Bierlaire
*Modeling public transport transfers in the �new� Lausanne train station*- Exploration of the tracking data collected in the main station of Basel. The objective is to calculate passenger-centric variability indicators and perform some simple modelling tasks.
- Student: Jos� Ram�n Rodriguez, June 02, 2017
- Supervision: Nicholas Molyneaux, Riccardo Scarinci, Michel Bierlaire
*Building an integrated model for modelling pedestrian movements inside hubs*- The objective of this project is to build a simulator for measuring the impact of management strategies inside transportation hubs.
- Student: Charles Jeanbart, June 02, 2017
- Supervision: Nicholas Molyneaux, Riccardo Scarinci, Michel Bierlaire
*Models for pedestrian movements based on integrated and sequential clustering*- The focus of this study is the modeling of speed-density relationship for pedestrian movements using the potential of available data. The data set considered in this project contains pedestrian trajectories collected in the train station in Lausanne. To track pedestrians, a large-scale network of tracking sensors is installed in the station (Alahi et al., 2014). The analysis we have performed reveals a high scatter in the data. To characterize the observed scatter we have developed a multi-class model of the speed-density relationship based on the latent class modeling approach (Nikolic et al., 2017). The latent class approach allows for modeling the segmentation in the population and the movement behavior simultaneously. The aim of this project is the derivation of the model representing speed-density relationship based on a two-stage (sequential) approach. The first stage involves segmentation of pedestrian trajectory data, by using machine learning techniques (clustering). In the second stage, a separate speed-density model is to be estimated for each cluster discovered in the first stage. The performance of the approach will be tested using real data, and compared to the more integrated, latent class approach.
- Student: Konde Romain Olivier Bondo, June 02, 2017
- Supervision: Marija Nikolic, Iliya Markov, Michel Bierlaire
*Investigating the role of attitudes in the purchase of new cars*- Attitudes and perceptions play an important role in decision-making processes. We are interested in new car purchases, and how attitudes and perceptions play a role in this context. We have a large dataset containing information of new car purchases, where respondents answered to several attitudinal questions. The objective of this semester project is to analyze these attitudinal questions, starting with principal component analysis. The study will be expanded to see how these attitudes affect purchases of new cars, and of electric vehicles in particular.
- Student: Nicola Ortelli, January 23, 2017
- Supervision: Anna Fernandez Antolin, Meritxell Pacheco, Michel Bierlaire
*Mobilit� Rail+Bus 2020 dans les Alpes vaudoises*- Une communaut� d��tudes, comprenant notamment la CITAV, a �tudi� de mani�re globale un territoire g�ographique appel� � Alpes vaudoises 2020 �. Le volet mobilit� n�a �t� trait� que de mani�re globale, tel que l�on peut notamment le constater dans le rapport final de juillet 2013. Apr�s lecture attentive des documents � Alpes vaudoises 2020 � et des horaires actuels, les �tudiants d�velopperont et �valueront des variantes d�offre Rail+Bus sur la base du projet d�horaire trains 2025 le plus actuel.
- Student: David Moy de Vitry Jean-Baptiste Landes, January 13, 2017
- Supervision: Daniel Emery
*R�gulation de vitesse par la signalisation pour garantir un croisement actif*- Dans le cadre de la densification d�horaires cadenc�s sur lignes � simple voie, il y a souvent n�cessit� que les trains se croisent hors gare. Il est donc int�ressant de pr�voir un �lot de croisement actif, c�est-�-dire sans qu�aucun des deux trains n�ait besoin de s�arr�ter. L'�tude consiste premi�rement � �tablir une d�marche pour �tablir les diff�rentes topologies devant �tre �tudi�es. Dans la partie principale, le projet consistera � faire varier de mani�re syst�matique et logique, sur un tron�on de ligne suisse � voie �troite fictif, la vitesse de ligne, la longueur de l'ilot � deux voies, les endroits de d�tection des trains, les endroits de r�duction de la vitesse pour le train en avance sur l'autre, et la valeur de cette(ces) r�duction(s) de vitesse. La signalisation sera de type lat�ral � trois aspects avec, si besoin, chiffre compl�mentaire d'annonce ou d'ex�cution de vitesse. L'outil de simulation OpenTrack sera utilis�.
- Student: Beno�t Corday Marc Zimmermann, January 13, 2017
- Supervision: Daniel Emery
*Price of anarchy in public transit networks*- Student: Marc-Edouard Schultheiss (SGC), December 23, 2016
- Supervision: Stefan Binder, Tom�s Robenek, Michel Bierlaire
*Une mod�lisation de la grande mobilit�*- Student: Pauline Hosotte, December 23, 2016
- Supervision: Matthieu de Lapparent, Michel Bierlaire, E. Ravalet, V. Kaufman (LASUR)
*Grandes mobilit�s r�versibles. Approche par la mod�lisation dynamique de choix discrets.*- Student: Alexis Gumy, December 23, 2016
- Supervision: Matthieu de Lapparent, Michel Bierlaire, E. Ravalet, V. Kaufman (LASUR)
*�tude d�taill�e des contours de r�f�rence ferroviaires et d�rogations*- Dans le cadre du projet Clip-Air (http://clipair.epfl.ch/) il est envisag� d'acheminer des capsules par le rail. La pr�-�tude au projet de Master consiste � �tudier tr�s pr�cis�ment les gabarits de r�f�rence ferroviaires pour voie � �cartement UIC tant au niveau suisse, qu'europ�en et am�ricain non seulement en alignement mais aussi en courbe. Les relations avec les gabarits limites des obstacles seront mises en �vidence. Les proc�dures suisses pour les transports exceptionnels par rail sur voie � �cartement UIC seront d�crites.
- Student: Martin Ellwanger (SGC), December 23, 2016
- Supervision: Daniel Emery
*4. Modeling Route Choice in Quebec City Using Mental Representations*- In this project, we build upon previous work proposed by Kazagli et al., 2016 to model route choice for a big network and dataset concerning the city of Quebec. We aim first to define the mental representation items (MRIs) for the case study and then to derive operational route choice models based on them. A GPS dataset from the city of Quebec is available and will be used for this purpose. The focus of the project is methodological.
- Student: Mathieu Plourde, December 23, 2016
- Supervision: Evanthia Kazagli, Matthieu de Lapparent, Michel Bierlaire
*Passengers' connection time preferences in airline itinerary choice*- As noted by Theis et al. (2006), "Network airlines traditionally attempt to minimize passenger connecting times at hub airports, assuming that passengers prefer minimum scheduled elapsed time for their trips. However, minimizing connecting times creates schedule peaks at hub airports. These peaks are extremely cost-intensive in terms of additional personnel, resources, runway capacity, and schedule recovery. Consequently, passenger connecting times should be minimized only if the anticipated revenue gain of minimizing passenger connection times is larger than the increase." Prior work has used (small) stated preference surveys to estimate customers' connection time preferences, and explicitly whether this function is nonlinear with connection time (i.e., customers avoid very short connections and very long connections). However, little is known as to how these connection time preferences vary as a function of other characteristics, including flight frequency (or schedule delay), length of haul, whether the flight is the last flight of the day, prior on-time performance of flight legs. As part of this project, the student will estimate airline itinerary choice models using a large ticketing database provided by the Airlines Reporting Corporation (ARC). The student will build off of prior MNL models that have been estimated which have corrected for price endogeneity and focus explicitly on refining the utility function related to connection time preferences.
- Student: Elisabeth Zbinden (SGC), December 23, 2016
- Supervision: Virginie Lurkin, Matthieu de Lapparent, Michel Bierlaire, GARROW
*Demand based rolling stock allocation*- Providing a high level of service for the passengers is one of the most important requirements of passenger railway company. In practice during rush hours passengers cannot be transported according to usual service standards because of a shortage of the rolling stock capacity. The purpose of this pre-project is to determine an efficient method to allocate the rolling stock taking into account passengers demand.
- Student: Salma Derouiche (SIN), December 23, 2016
- Supervision: Yousef Maknoon, Tom�s Robenek, Michel Bierlaire, Simon Landureau
*Generalization and policy analysis for a rich inventory routing problem*- We solve a rich logistical problem inspired from practice, in which a set of trucks is used for collecting recyclable waste from large containers over a finite planning horizon. Each container is equipped with a sensor, which communicates its level at the start of the day. Given a history of observations, a forecasting model is used to estimate the point demand forecasts as well as a forecasting error representing the level of uncertainty. The problem falls under the framework of the stochastic inventory routing problem. We introduce dynamic probabilistic information in the solution process, which impacts the cost through the probability of container overflows on future days and the probability of route failures. To solve the problem, we implement an adaptive large neighborhood search algorithm, which integrates a specialized forecasting model, tested and validated on real data. The student will analyze the performance of the algorithm and its results for various scenarios and collection and routing policies. In particular, we would like to see the impact on the best solution of the full probabilistic model with various cost parameters against simpler policies, such as one using buffer truck and container capacities to handle stochastic demand. We would like to apply the model on a rolling horizon basis and analyze the expected value of perfect information, the properties of the stochastic solution, etc. Other practical features such as open tours, multi-product problems, etc. may also be explored. We can also work on improving the algorithmic performance per se through new operators and more intelligent search strategies in the current implementation. This project is appropriate for a student with excellent coding skills in Java and knowledge of a good software for plotting and data analysis such as Matlab or R. The focus of the project will be suited to the student's interests, coding abilities, and the number of credits he or she needs.
- Student: Prisca Aeby (SIN), December 23, 2016
- Supervision: Iliya Markov, Yousef Maknoon, Michel Bierlaire
*Measure of user-oriented service variability in hubs*- This project's goal is to explore the service variability (reliability) in public transport hubs. Three operator oriented service characteristics are common in literature (robustness, reliability and punctuality). As these measures are operator oriented, they might not reflect actual level-of-service (LOS) experienced by users (pedestrians). To account for this difference, user-centered measures will be defined then observed using an already secured data set. Some examples of variability measures are OD travel time, passenger transfer times, passenger waiting times, train punctuality, etc. The main data sets used for this project is the pedestrian tracking data from the Lausanne and Basel train stations and possibly some effective train time tables.
- Student: Anouk Allenspach and Dieynaba Dia (SGC), December 23, 2016
- Supervision: Nicholas Molyneaux, Riccardo Scarinci, Michel Bierlaire
*Accounting for dynamics in pedestrian multi-class speed-density relationship*- The relationship between speed and density plays an important role in modeling of pedestrian traffic. It is useful for planning and design of pedestrian facilities, and it is also a required input or calibration criterion for models of pedestrian dynamics. The relationship is specified under the assumption that the traffic system is at equilibrium (stationary and homogenous). The analysis we have performed, based on the data collected in the Lausanne train station, rules out the use of a unique equilibrium relationship due to a high scatter in the data. This scatter may be explained by the violation of the equilibrium assumptions, as documented in the literature. To characterize the observed scatter we have developed a multi-class model of the speed-density relationship based on the latent class modeling approach. The model is derived by relaxing the homogeneity assumption of equilibrium relationships. It is assumed that pedestrian population is heterogeneous (e.g. different trip purpose, different time to departure, etc.) and that this heterogeneity leads to the existence of multiple pedestrian classes that are characterized by different behavior. There are two specification issues related to the panel data set (data collected over multiple time periods for the same sample of individuals) that we use in our analysis. The first is serial correlation across the observations of the same individual due to unobserved individual factors that persist over time. The second is related to dynamics, meaning that the speed in one period may depend on the speed values in the past. We have addressed the first issue by introducing an agent effect in the model that captures individual related unobserved factors. We term this model the static model with agent effect. The aim of this project will be to deal with the second issue, or dynamics. We will start with the simplified assumption that the speed at time t is influenced by the speed at time t - 1 only. We term such a model a dynamic model with agent effect. The performance of the approach will be tested using real data.
- Student: Marc-Edouard Schultheiss (SGC), December 23, 2016
- Supervision: Marija Nikolic, Matthieu de Lapparent, Michel Bierlaire
*Pricing and capacity allocation strategies for a demand-based revenues maximization problem*- The integration of customer behavioural models in optimization provides a better understanding of the preferences of clients (the demand) to policy makers while planning for their systems (the supply). These preferences are formalized with discrete choice models, and the corresponding optimization models where supply and demand closely interact are associated with (mixed) integer optimization problems. One concrete application of this integration consists of an operator selling services to a market, each service at a given price to a finite number of customers, called the capacity of the service. We are interested in finding the best strategy in terms of pricing and capacity allocation in order to maximize the revenues of the operator. The project objectives can be tailored for both Master or Semester project students.
- Student: Jonathan Lachkar (SGC), December 23, 2016
- Supervision: Meritxell Pacheco, Virginie Lurkin, Michel Bierlaire
*Energy consumption of an innovative catenary-free electric bus*- Electric busses help to decrease pollution in city centers. However, they need to be constantly attached to a power source. This limits their mobility and brings visual pollution due to continuous catenaries throughout the city. Focus of this project is a revolutionary catenaryfree electrical bus that includes short-range on-board batteries and a series of fast charging stations installed at some bus stops capable to charge the bus batteries in a few seconds without interference with the bus schedules. This project aims to develop a traffic simulation of this electric bus moving on a simple road network. A discrete event simulation representing the fundamental components of the system (e.g. bus, passengers load, on-board battery, charging station, storage level) should be developed, calibrated and validated using traffic data (such as number passengers on board, traffic and congestion information). Then, key indexes representing the system performance should be defined (e.g. travel time, dwell time, battery charge level). Methodologies from transportation modelling, simulation and programming (Java) will be used for completing this project.
- Student: Xiaoran Yu, December 23, 2016
- Supervision: Riccardo Scarinci, Yousef Maknoon, Michel Bierlaire
*Modeling evolution of sales of alternative fuel vehicles in Europe*- Student: Christophe Paillard (SMA), June 17, 2016
- Supervision: Matthieu de Lapparent, Michel Bierlaire
*Analysis of External Effects on Cyclicity in Passenger Railway Service*- In the passenger railway service, cyclicity is in general perceived as a beneficial attribute. The main allegation being memorability of such timetables by the passengers. However no quantitative proof has been presented to support such statement. In this project, the student will become familiar with a passenger satisfaction (that is based on utility theory) and further extend this concept by the attribute expressing the perception of the cyclicity. Student will then solve an optimization problem maximizing the passenger satisfaction and/or train operating company's profit. The benchmark will be done on a small part of Swiss network, followed by a test on a full scale network of Israeli Railways. Basic knowledge of programming is required.
- Student: Lucia Montero (CSE), June 17, 2016
- Supervision: Tom�s Robenek, Shadi Sharif Azadeh
*Traffic simulation model of an innovative catenary-free electric bus*- Electric busses help to decrease pollution in city centres. However, they need to be constantly attached to a power source. This limits their mobility and brings visual pollution due to continuous catenaries throughout the city. Focus of this project is a revolutionary catenary-free electrical bus that includes short-range on-board batteries and a series of fast charging stations installed at some bus stops capable to charge the bus batteries in a few seconds without interference with the bus schedules. This project aims to develop a traffic simulation of this electric bus moving on a simple road network. A discrete event simulation representing the fundamental components of the system (e.g. bus, passengers load, on-board battery, charging station, storage level) should be developed, calibrated and validated using traffic data (such as number passengers on board, traffic and congestion information). Then, key indexes representing the system performance should be defined (e.g. travel time, dwell time, battery charge level). Methodologies from transportation modelling, simulation and programming (MATLAB) will be used for completing this project.
- Student: Romain Meyer (SGC), June 17, 2016
- Supervision: Riccardo Scarinci, Yousef Maknoon, Michel Bierlaire
*Solar Decathlon: strategies for a sustainable mobility to achieve the goal of a 2000-Watt society*- Solar Decathlon is an international competition that challenges twenty university teams from around the world to build and operate solar-powered houses. This project is part of the EPFL multidisciplinary team of students participating at this competition. The global objective is to transform a regular district in Fribourg into a sustainable eco-district using the solar-powered building as an activator. This building would promote sustainable actions, reduction in energy consumption and soft mobility. This project aims to evaluate the necessary strategies to incentive sustainable mobility inside the district. The goal is to suggest concrete actions that would incentive the modal shift toward more sustainable modes of transport. The effects of these strategies should be quantified and analyzed. The total energy consumed for mobility should respect the limit suggested by the 2000-Watt society. This concept proposes a way of living where nobody consumes more than a continuous 2000 W in comparison with the 6000 W currently consumed in Europe. Knowledge of transportation systems, environmental impacts and strong quantitative analysis skills are required to complete this project. The student will also interact with the other members of the Solar Decathlon competition.
- Student: Charles Albert Jeanbart (SGC), June 17, 2016
- Supervision: Riccardo Scarinci, Michel Bierlaire
*Modeling route choice in Qu�bec using mental representations*- In this project, we aim at simplifying the route choice problem by modeling the strategic decisions of people --represented by the mental representations of their itineraries-- instead of the operational ones --represented by paths. We define an abstracted graph based on what we denote mental representation item (MRI) and we derive operational route choice models based on it. A GPS dataset from the city of Quebec is available and will be used for this purpose. Hence, the project is divided in two main parts; the first and technical part which involves data processing, and the second methodological part which involves the development of a model for the MRI network.
- Student: Mathieu Plourde, June 03, 2016
- Supervision: Evanthia Kazagli, Matthieu de Lapparent, Michel Bierlaire
*Strategic Energy Planning under Uncertainty*- The main goal of the project is to classify parameter uncertainty (i.e. defining ranges of variations or probability distribution functions) for the Swiss energy system in the year 2035 and evaluate its impact on energy planning decisions.
- Student: Cyprien Say (SGC), June 01, 2016
- Supervision: Stefano Moret, Shadi Sharif Azadeh, Michel Bierlaire
*Hedonic pricing of car attributes: a comparison across European countries*- Hedonic pricing is a revealed preference approach that is used for valuation of constituent characteristics of a good or a service. This project aims at pricing car attributes using disaggregate data on car purchases in 5 European countries from 2010 to 2014. Attention will be paid on estimation of market price gradients and willingness-to-pay for engine types, fuel consumption, weight to power ratio, etc., while accounting for heterogenous preferences of consumers and controlling for market segments, changes in quality, and brand effects. The candidate will take a strong interest in nonlinear regression methods, issues in econometric modeling, analysis and preparation of large datasets, and programming.
- Student: Anna-Katharina Clodong (SGC), January 30, 2016
- Supervision: Matthieu de Lapparent, Anna Fernandez Antolin, Michel Bierlaire
*Specification testing of fundamental diagrams for an anisotropic pedestrian network loading model*- Student: Joel Mateus Fonseca (SSC), January 30, 2016
- Supervision: Flurin H�nseler, Marija Nikolic, Michel Bierlaire
*Online estimation of pedestrian origin-destination demand in train stations using Kalman Filtering*- Student: Marc Solsona Bernet (SGC), January 30, 2016
- Supervision: Flurin H�nseler, Stefan Binder, Michel Bierlaire
*Accelerating moving walkways as a transport mode of the future: system optimization and management*- In a hypothetical future where the use of private cars will be limited in cities, the need for movement will be satisfied by a mix of transport modes such as public transport, cycling, walking and other innovative systems. One of these possible futuristic systems, focus of this project, is an urban network of Accelerating Moving Walkways (AMW), i.e. a moving conveyor system for pedestrian similar to the one used in airports capable to reach speeds up to 15km/h. This project aims to optimize the network design of this innovative transport system of AMWs on the city of Geneva. Given the origin-destination demand, pedestrians are assigned to the city road network in order to obtain route choice and trip distributions. This information is used to identify the optimal configuration of link equipped with AMWs and their capacity. For this, a specifically developed optimization framework is used. Empirical mobility data and the road network (both already available) should be used as input of the optimization framework. Methodologies from mathematical optimisation, traffic assignment, programming (MATLAB) and Geographic Information Systems (GIS) will be used for completing this project.
- Student: Alexandre Petit, January 15, 2016
- Supervision: Riccardo Scarinci, Michel Bierlaire
*Development of a novel pedestrian walking model applicable to congested flows*- We are in the process of developing a novel pedestrian walking model that can describe multi-directional and congested pedestrian flow. Given a certain demand, the model is supposed to predict travel times and density levels as accurately as possible. The basic idea thereby consists in discretizing walkable space into cells and links, and to compute for each link a speed based on an empirical density-speed relation. The goal of this project, which can be carried out as a Bachelor's, semester, or Master's thesis, is (i) to understand and improve the existing mathematical model, (ii) to accordingly update the computational model (written in Java), and (iii) to consider a real-world case study involving either a Swiss railway station, a Dutch bottleneck experiment or a pedestrian crossing in Hong Kong, China. In the long term, this model will be useful for real-time crowd monitoring and control, as well as for infrastructure dimensioning of e.g. a train station. Skills in object-oriented programming and a basic knowledge of statistical mathematics are required; knowledge of parallel computing is a plus. Semester: Spring 2015. If interested, please contact us at {flurin.haenseler,marija.nikolic}@epfl.ch. We're looking forward to hearing from you.
- Student: Gael LEDERREY, June 19, 2015
- Supervision: Flurin H�nseler, Marija Nikolic, Michel Bierlaire
- In collaboration with SBB-CFF-FFS
*Development of an aggregate route choice model for a big network*- The use of random utility models for route choice analysis involves challenges stemming from the high requirements in data and data processing, the physical overlap of paths, and the large size of the choice set. These factors increase the complexity of the models significantly. In order to simplify the problem, a novel approach based on an aggregate representation of route choices has been proposed. The conventional representation and modeling approach is based on path alternatives constructed as link-by-link sequences on the network. This approach entails a very large number of possible paths connecting a given origin and destination (OD), and high correlation among the alternative paths. In this work, we claim that a path is solely the manifestation of the route choice, i.e. the way the traveler implements her decision to take a specific route, and we replace the paths with aggregate elements that we denote as Mental Representation Items (MRIs). This key feature allows us to reduce the complexity of the model and at the same time is more behaviorally realistic. The aim of this project is to extend this approach and apply it in a big network for which information about congestion is available. A GPS dataset from the city of Quebec is available and will be used for this purpose. Knowledge of statistical mathematics and familiarity with MATLAB and SQL are required. Geographic Information Systems (GIS) software will be used for completing this project.
- Student: Arriagada Diego Alexandre, June 19, 2015
- Supervision: Evanthia Kazagli, Matthieu de Lapparent, Michel Bierlaire
- In collaboration with McGill University
*Pedestrian movement in train stations: modeling speed-density relationship for different classes of passengers*- The increased number of passengers in train stations is causing congestion not only on trains, but also on platforms and underpasses. To better design and manage these infrastructures, pedestrian movement should be understood and modeled accurately. Fundamental Diagram (FD) plays an important role in the representation of pedestrian dynamics. FD models the relationship between density of pedestrians and the speed at which they are able to move. This macroscopic model represents the average behavior and does not take into account differences among pedestrians. They can differ in terms of their purpose of the trip (e.g. business/leisure), personal characteristics (e.g. age, gender), presence of luggage, etc. This heterogeneity can lead to different walking behavior of pedestrians and should be adequately modeled by the FD. This project aims to develop a Multi-Class Fundamental Diagram (MC-FD) assuming the existence of different classes of passengers in a train station. As a case study we will use the Lausanne train station where detailed pedestrian trajectories have been collected. The key elements of the project are: (i) literature review of MC-FD for both pedestrians and vehicles; (ii) development of the modeling assumptions employing empirical, qualitative and sociological considerations; (iii) model specification; (iv) sensitivity analysis, calibration and validation of the proposed model based on empirical data. Knowledge of statistical mathematics and familiarity with programming (MATLAB) are required.
- Student: Laure Emma Rosine, June 19, 2015
- Supervision: Marija Nikolic, Riccardo Scarinci, Michel Bierlaire
*Routing of a mixed fleet of electric and diesel trucks: Analysis of solution approaches*- A transportation company wants to study the potential benefit of replacing some of the diesel trucks in its fleet with electric ones. Electric and diesel trucks have comparable characteristics in terms of capacity and electric trucks are capable of performing an average daily itinerary on a single charge. The price of an electric truck is higher, while its operating cost is much lower compared to a diesel truck. Therefore, we want to find an intelligent deployment of the mixed fleet so as to minimize cost. The goal is the development of a vehicle routing model and/or heuristic, taking into account the characteristics of the various trucks, including fuel/energy consumption, speed, capacity, compatibilities, working time, service times, etc. The integration of the truck load's impact on fuel/energy consumption and the analysis of battery replacement/recharging strategies could also be considered if time permits. Solution quality can be compared against benchmarks results and data from the state of practice. As a previous semester project, a student has already worked on defining the problem, developing a heuristic algorithm and obtaining some results. The current project is intended to do a deeper analysis and implementation of solution methodologies. This project is appropriate for a student with an interest in operations research and experience in programming (Java preferred). The workload can be adjusted to the number of credits.
- Student: Noortje Verstegen (SIN), May 29, 2015
- Supervision: Iliya Markov, Stefan Binder, Michel Bierlaire
- In collaboration with HES-Fribourg, CREM
*Implementation of a futuristic transport system based on accelerated moving walkways: optimization on a real case study*- In a hypothetical future where the use of private cars will be limited in cities, the need for movement will be satisfied by a mix of transport modes such as public transport, cycling, walking and other innovative systems. One of these possible futuristic systems, focus of this project, is an urban network of Accelerated Moving Walkways (AMWs), i.e. a moving conveyor system for pedestrian similar to the one used in airports. This project aims to apply an optimization framework to identify the optimal network design of this innovative transport system of AMWs on a real case study. Given the origin-destination demand, pedestrians are assigned to a road network in order to have route choice and trip distributions. On this scenario, the optimal configuration of link equipped with AMWs and their capacity is define. For this purpose, a specifically developed optimization framework is used, and it should be applied to a real city. Lausanne presents appropriate transportation and geographical characteristic to be used as a case study. Empirical mobility data and the city network should be used as input of the optimization framework. Methodologies from mathematical optimization, traffic assignment, programming (MATLAB) and Geographic Information Systems (GIS) will be used for completing this project.
- Student: Rapha�l Luthi (SSIE), May 29, 2015
- Supervision: Riccardo Scarinci, Iliya Markov, Michel Bierlaire
*Planning tool for the admission of medical graduates into the Otolaryngology training program in the CHUV*- Student: Guillaume Lopez, January 15, 2015
- Supervision: Yousef Maknoon, Shadi Sharif Azadeh, Michel Bierlaire
*A destination choice model for EPFL Campus*- Based on WiFi traces from access points, the goal of this semester project consists in developing binary discrete choice models for the choice of attending classes.
- Student: Lo�c Tinguely (SGC), December 19, 2014
- Supervision: Antonin Danalet, Matthieu de Lapparent
*Accounting for attitudes in modeling demand for electric vehicles*- The purpose is to characterize and to model determinants of electric vehicle acceptance and adoption by individuals. Special attention will be paid to additional integration of attitudinal drivers and barriers to adherence to such technology. It aims at understanding how consumers accept the financial and lifestyle investments associated with the leap from traditional to electric powertrains, focusing on battery electric (BEV) and plug-in hybrid electric (PHEV) vehicles. To this extent, the 2012 Renault-Nissan Alliance survey on electric vehicles will be used. Data are collected over 5 European countries: France, Italy, Germany, Spain, UK. It focuses on current owners of a car bought new between 6 months and 5 years ago and who intend to buy a new car in the next 5 years. State-of-the-art and extended discrete choice models will be developed to account for formation of latent processes and existence of endogeneity issues.
- Student: Maurin Baillif (SGC), December 19, 2014
- Supervision: Matthieu de Lapparent, Anna Fernandez Antolin, Michel Bierlaire
- In collaboration with Nissan
*Routing of a mixed fleet of electric and internal combustion trucks*- A transportation company has introduced a number of electric trucks into their current fleet of internal combustion trucks. Electric and internal combustion trucks have similar characteristics in terms of capacity and electric trucks are capable of performing an average daily itinerary on a single charge. The goal is the development of a vehicle routing model and heuristic, taking into account the characteristics of the various trucks, including fuel/energy consumption, speed, capacity, compatibilities, working time, service times, etc. Various objectives could be considered and analyzed, such as the minimization of time, energy consumption and cost. The integration of the truck load's impact on fuel/energy consumption and the analysis of battery replacement/recharging strategies could also be considered if time permits. Data is available for benchmarking with the state of practice and assessing the heuristic's performance against the mathematical model. This project is appropriate for a student with an interest in operations research (mixed integer linear programming), some experience with mathematical programming languages (e.g. AMPL or CPLEX OPL) and good programming skills (e.g. C++, Java or Matlab).
- Student: Thomas Cibils (SMGT), December 19, 2014
- Supervision: Iliya Markov, Stefan Binder, Michel Bierlaire
- In collaboration with HES-Fribourg, CREM
*3D routing approach for air navigation planning for small sized planes*- This projects aims to study and visualize the aviation data using factors such as, geographical information of the plane as well as weather condition for a flight most specifically during cruise phase. MATLAB is a powerful software with high quality of visualization of data, however, when the size of data gets bigger, the performance of MATLAB degrades and it becomes slower. Recently, some new software such as, Tableau has been introduced that provide powerful tools to visualize the big data.
- Student: Jamal El Rhazi (SGC), December 19, 2014
- Supervision: Shadi Sharif Azadeh, Michel Bierlaire, Stefan Binder
*Development and Implementation of a Decision Making Tool in Quality Control Networks using Quantitative System Modeling Techniques*- In an increasingly complex business environment, managers have to grapple with problems and issues, which range from relatively trivial to the strategic. This project proposes to develop and implement a decision making tool to optimize quality control networks. To do so, several metaheuristics will be used as an efficient approach to improve global value chains towards lean manufacturing applied to a production process of Nestle. The control mechanism of each control point determines the conformity (or non-conformity) of the product in the supply chain defining a sample randomly chosen units and indicating the maximum number of bad units for each batch to pass control points. As control points become decision variables, the detailed examination of control mechanisms at each control point requires the use of nonlinear algorithms. The following decision variables have to be optimized in the considered networks: (1) determine the set of control points; (2) determine the control plan parameters of each control point. That point requires understanding basics of statistical quality control. The objective function contains a performance and a risk component, and a budget constraint has to be satisfied. The following metaheuristics will at least be investigated: tabu search, variable neighborhood search and adaptive memory algorithms. In addition, an exact method relying on CPLEX should be compared to the proposed metaheuristics.
- Student: Pierre Jullien de Pommerol (SGC), July 18, 2014
- Supervision: Michel Bierlaire, Prof. Nicolas Zufferey, EPFL STI LGPP
*A two-step approach for estimating pedestrian demand in a congested network*- Student: Eduard Rojas (SIN), May 30, 2014
- Supervision: Flurin H�nseler, Antonin Danalet, Michel Bierlaire
- In collaboration with SBB-CFF-FFS
*Train Management in SNCF Application*- Student: Cao Huu-�n (CSE), May 30, 2014
- Supervision: Tom�s Robenek, Stefan Binder, Michel Bierlaire
*Optimisation of the network design of a futuristic transport system based on moving walkways*- In a hypothetical future where the use of private cars will be limited in cities, the need of movement will be satisfied by a mix of transport modes like public transport, cycling, walking and other innovative systems. One of these possible futuristic systems, focus of this project, is an urban network of moving walkways, i.e. a moving conveyor system for pedestrian like the one used in airports. This project aims to study and optimize the network design of this innovative transport system of moving walkways, exploring various network configuration and system characteristics to understand which specification could satisfy at best the increased demand. Given the origin destination demand and trip distribution, the variables of the optimization problem should be defined such that indexes of performance, e.g. overall traveling time and cost, are minimized. Example of design variables for this innovative transport system are: number of links to be equipped with moving walkways, moving pathway speed and system capacity that can be related to energy consumption and construction cost. Methodologies from mathematical optimization, transport network design, simulation and scripting will be used for complete this project.
- Student: Guillaume Lopez, May 30, 2014
- Supervision: Riccardo Scarinci, Jianghang Chen, Michel Bierlaire
*Demand/supply coupling in pedestrian traffic estimation*- The main purpose of this paper is to show a mathematical framework for solving the fixed-point arising in joint demand estimation / traffic assignment problems. As a case study. a congested corridor with known outflow is considered, for which the inflows is predicted using the developed framework. The model is based on a coupling between the travel demand and the network supply (the infrastructure available) in an analogous way as what is done in economics.
- Student: J�r�my Rabasco (CSE), January 31, 2014
- Supervision: Flurin H�nseler, Michel Bierlaire
*Schedule-based estimation of pedestrian travel demand within a quasi-uncongested railway station*- In many railway stations, capacity limits are reached at peak hours and congestion in pedestrian facilities occurs. There is thus a general need to analyze and model pedestrian flows in train stations. In this process, estimating pedestrian origin-destination demand and, more precisely, route flows is a major challenge. The ultimate goal of this research project is to dynamically predict pedestrian travel demand within a train station based on train time table and train track assignment. To this end, a preliminary methodology has been developed. This framework needs to be refined and extended in many ways, which can be an interesting and suitable task for a semester or Master's thesis. Your thesis would be part of a comprehensive project employing pedestrian tracking, flow modeling and infrastructure optimization. All ideas and model concepts will be tested, parametrized and validated on a real case study.
- Student: Quentin Mazars-Simon (SSC), January 31, 2014
- Supervision: Flurin H�nseler, Amanda Stathopoulos
- In collaboration with SBB-CFF-FFS
*Implementation of Tabu Search in Quality Control Networks*- This project proposes to optimize quality control networks using the tabu search algorithm as a novel solution to improve global supply chains towards lean manufacturing applied to the Nestle chocolate supply chain. The control mechanism of each control point determines the conformity (or non-conformity)) of the product in the supply chain defining a sample of randomly chosen units and indicating the maximum number of bad units for each batch to pass a control point. As control points become decision variables, the detailed examination of control mechanisms at each control point require the use of non-linear algorithms. In a first phase, control points as decision variables necessitate the examination and identification of (sub)optimal control mechanisms. This is followed by the proposition of a first model using the tabu search algorithm. This model will demonstrate links among suboptimal solutions, but also synergies among risk, performance and budget distribution in quality control networks. In order to efficiently allocate quality control network resources, this project proposes to globally optimize the control mechanism for equi-distribution of risk, performance and budget using the tabu search algorithm.
- Student: Pierre Jullien de Pomerol (SGC), January 20, 2014
- Supervision: Michel Bierlaire, Prof. Nicolas Zufferey, EPFL STI LGPP
*Optimisation des tourn�es de ramassage des employ�s de l'a�roport de Gen�ve (Pre-Project)*- Student: Isabel Tovar (SGC), January 20, 2014
- Supervision: Tom�s Robenek, Stefan Binder, Michel Bierlaire, Philippe Quaglia
- In collaboration with Geneva Airport
*Vehicle dispatching problem in physical internet hub and spoke model*- The call for sustainability in logistics section promotes the idea of Physical Internet (PI). The approach of PI aims to universally interconnect logistics networks as the digital internet did with computer networks. In the world of physical internet, consumer goods are encapsulated in smart and secured containers (i.e., PI containers) and are routed in logistics networks with the similar pattern that digital packets are handled in the internet.
- Student: Alexis Dubil (SGC), January 17, 2014
- Supervision: Jianghang Chen
*Vehicle routing problem coupling with bin packing*- The call for sustainability in logistics section promotes the idea of Physical Internet (PI). The approach of PI aims to universally interconnect logistics networks as the digital internet did with computer networks. In the world of physical internet, consumer goods are encapsulated in smart and secured containers (i.e., PI boxes) and are routed in logistics networks with the similar pattern that digital packets are handled in the internet. In this student project, we focus on the last mile problem in the PI. After PI boxes arrive their final designated PI hub, given clients� addresses and the information of the trucks (e.g., truck weight and volume capacities) available at this hub, the decision makers aim to assign the minimal number of trucks to deliver all the arrived PI containers to their destinations in a cost-effective way. This is a typical Vehicle Routing Problem (VRP) but with the side constraint that we need to take the dimensions of the PI boxes (in 3D) into account when loading and/or unloading occur. This problem is termed vehicle routing problem coupling with bin packing. Its essential constraints that the student need to consider are: 1. The available number of vehicles is bounded; 2. Vehicle weight and volume capacities cannot be exceeded; 3. The loading and unloading need to follow the policy of �Last-in-first-out�.
- Student: Buytaert Gabrielle (SSC), January 17, 2014
- Supervision: Jianghang Chen
*Identify User�s Locations of Interest from Smartphone WiFi Data*- Smartphone is a powerful and convenient tool for collecting a variety of data (location, social interaction, and more) that can be useful for individual mobility analysis. Most of the ongoing research relies on GPS to acquire accurate location. GPS though is expensive in terms of battery consumption. In addition, the GPS sensor embedded in mobile phones fail in practice more often than dedicated GPS devices. Yet, smartphones are endowed with multiple sensors from which location can be inferred. Wifi sensors provide stable indoor location data and have been identified as a potential alter- native to indicate location that can well serve in addition and complementary to GPS data to advance mobility learning. The location extraction from Wi-fi records permits the detection of users� regular places of visit, the frequency and intensity (number of times) of visiting these places, as well as patterns such as the time of day and duration of visit. This kind of information is relevant for the identification of activity locations making use of clustering techniques, and after further analysis they can support measuring the activity space and intensity of activity participation of the user. By fusing the information about activity locations with land use and points of interest (POI) data, as well as with more data acquired from the smartphone sensors (e.g. phone status, Bluetooth, charging, phone interaction etc.), and taking into account temporal dimensions, it is then possible to infer the type of activity at these location (including home and work locations) and subsequently trip/ activity purposes can be disclosed. In addition to the above, and building on the identification of meaningful clusters, WiFi data have the potential to assist the identification of origins and destinations of trips (often missing in case of GPS). This information can then be used for improving and validating trip detection algorithms, which currently appear to be problematic and hence introduce biases in the subsequent stage of map-matching (e.g. one a known trip is segmented in several due to the limitations of the algorithm and GPS data). This project aims at exploiting the advantages of the WiFi data discussed above for individual mobility analysis.
- Student: Am�lie Buisson (GC) (SGC), January 17, 2014
- Supervision: Evanthia Kazagli, Antonin Danalet, Michel Bierlaire, Francisco Pereira
*Mode choice analysis from a large smartphone dataset*- Smartphone is a powerful and convenient tool for collecting a variety of data (location, social interaction, and more) that can be useful for individual mobility analysis. One of the advantages of smartphone data is the ability to collect data over longer periods of time (panel data) without burdening the respondent. Having such resolution of information enables us to gain better insight into the general mobility style of people than it would be possible by means of traditional one- or two-day travel surveys. It becomes clear that smartphone data have great potential with respect to analysing travel- ers� profiles and disclose systematic mobility (e.g habit, morning or afternoon routines etc.) and switching behavior patterns (departure time, chosen route, mode). This project focuses on such higher-order mobility styles in order to shed light on travel behavior.
- Student: Mikael Nicolas Xavier Friederich (SGC), January 17, 2014
- Supervision: Evanthia Kazagli, Marija Nikolic
*Exploration of smartphone users trip data to investigate travel behavior*- Smartphone is a powerful and convenient tool for collecting a variety of data (location, social interaction, and more) that can be useful for individual mobility analysis. One of the advantages of smartphone data is the ability to collect data over longer periods of time (panel data) without burdening the respondent. Having such resolution of information enables us to gain better insight into the general mobility style of people than it would be possible by means of traditional one- or two-day travel surveys. This project aims at unveiling frequent behaviours in terms of space, i.e., the regions of space traversed during movements and understand the processes generating them. The work elaborated in the project is expected to support our effort in incorporating travelers� mental/ spatial represen- tation items (MRI) in route choice modeling. More specifically, the goal of this bigger project is to develop a modeling framework where the route choice decisions will take place in a higher/ concep- tual level. Path alternatives will be constructed as �replaced by� sequences of mental geo-marked items �akin to the concept of anchor points as elements of travelers� mental maps in cognitive science. We are interested in car route choice, hence the scope of this semester project will also focus on car trips. In this context, processing and analysing the trips of the smartphone users can reveal the most frequently traversed points or segments of the network (both in an aggregate but also in an individual level) that can signify such items in the network.
- Student: Mikael Nicolas Xavier Friederich (SGC), January 17, 2014
- Supervision: Evanthia Kazagli, Marija Nikolic
*Exploring pedestrian mobility using video tracking data in Lausanne train station*- Pedestrians, contrary to the other modes, do not have defined network and they do not follow strict constraints. A characteristic feature of pedestrian route choice is that routes are continuous trajectories in time and space - pedestrians choose a route from an infinite set of alternatives. As a consequence of these facts we have observed the distribution of walked distances and travel times for specific origin-destination pairs at the train station in Laussane, during the morning rush hour. The goal of this project is to analyse the distribution of walked distances and corresponding travel times and speed values based on pedestrian trajectories collected at the train station in Lausanne. Here we would like to answer the questions such as: 1) Is the motion of pedestrians random or does it follow a specific pattern? How can we characterize it? 2) What is the impact of congestion on the mentioned observables? 3) Do familiarity with the place, the attractiveness of shops and signs found along the corridors affect pedestrian motion behaviour and how? What are the other factors that cause deviations from a straight line motion? Programming skills and knowledge of statistical mathematics are required.
- Student: Babel Hugo Louis, January 17, 2014
- Supervision: Marija Nikolic, Evanthia Kazagli
*Modeling the demand for financial products*- This MA pre-project focuses on developing a demand model for financial products. The work is carried out in collaboration with a trading service partner an based on real data on commodity portfolio investments. The project will cover the following: i) a literature review on the demand for financial products, behavioural finance on trading choices, ii) development of a demand model on the client data that is able to qualify the impact of different determinant (price, spread, client features, external events) on decisions to buy/sell the commodity, iii) testing the model on different scenarios (sensitivity to different changes in conditions) and validation. The work comprises: conceptual modeling, data elaboration/exploration and empirical model development, hence this pre-project and the related MA project requires skills in mathematics, management of large data, statistics/econometrics related to discrete choice models and some knowledge of behavioural theories in finance.
- Student: Billal Mahoubi (SGC), January 10, 2014
- Supervision: Amanda Stathopoulos
*Optimisation des transports scolaires � Grandson II*- Analyser les probl�matiques, actuelles et futures, et proposer des solutions d'am�lioration d�coulant de l'organisation et de la gestion de l'ensemble des transports n�cessaires � la bonne marche du groupement et de l'arrondissement scolaire de Grandson (18 communes, 1'350 �l�ves, 70 classes, 12 sites scolaires). Ces probl�matiques r�sultent principalement d'une augmentation significative des co�ts li�s � l'introduction de la communaut� tarifaire vaudoise (Mobilis), de contraintes li�es � l'entr�e en vigueur d'HarmoS, des projets de constructions de l'association intercommunal, de l'�volution du r�seau r�gional des transports voire �galement des synergies � d�velopper avec le milieu parascolaire.
- Student: Franka Tholen (SMA), June 07, 2013
- Supervision: Michel Bierlaire, Tom�s Robenek, Bilge Atasoy, Yves Guilloud, Association Intercommunale du Groupement et de l'Arrondissement Scolaires de Grandson
*Mobility learning from smartphone WIFI data*- Smartphone is a powerful and convenient platform for collecting location data for mobility behavior research. Most of the research relies on GPS to get accurate location, or GSM to get massively available but imprecise location. This project investigates the feasibility of using WIFI data for mobility behavior research. The dataset is collected from 200 smartphones over 2 years. The data collection application (EPFLScope) records all nearby WIFI access points (AP) every 3-5 minutes. Some of the WIFI access points are associated with location information. Therefore, it is possible to identify the location of the smartphone according to the nearby WIFI AP. With this location information, we can further understand spatial and temporal mobility patterns.
- Student: Am�lie Buisson (SGC), June 07, 2013
- Supervision: Jingmin Chen, Evanthia Kazagli, Marija Nikolic
*Activities in Pal�o Music Festival from Bluetooth*- Can we guess the activities of spectators in a music festival from Bluetooth traces collected from 10 people with smartphones used as antennas? This project will study an existing dataset and existing map data from Pal�o music festival in Nyon, Switzerland. Depending on the results, the report will either draw conclusions about spectators' behavior, or recommend other data collection specifications for this particular case study. For more information, don't hesitate to contact the assistant of the project.
- Student: Elisaveta Kondratieva (SSC), June 07, 2013
- Supervision: Antonin Danalet
*Visualization of pedestrian demand in a 3D graph*- This project aims at visualizing flows in a pedestrian graph in 3D. The graph is coded as a postGIS database (postgresql). The goal consists in representing the density at each node and eventually the flows between the nodes (data coming from our own algorithm). The visualization needs to be both in 3D and in 2D for printing. An IC student would ideally fit the goal of this project. The first step would be to compare the pros and cons of Processing and Google Map/Earth. Then it would consists in visualizing the pedestrian graph in the chosen tool. As a final step, the student will include density data of signals (without treatment) and the results of our algorithm in the map (treated data) and generate final maps and animations from data. As an inspiration of how it could possibly look like this (but with pedestrian as dots instead of trains)
- Student: Javier Lopez-Montenegro Ramil (SIN), June 07, 2013
- Supervision: Antonin Danalet, Bilal Farooq
*Associations generation in synthetic population*- In recent years significant advancements have been made in the research related to agent based urban systems modelling, especially in the area of activity based large scale travel demand models. Synthesis of different types of agents (person, family, and household) is an integral part of the input preparation for such models and micosimulations. In addition to agents generation, these recent developments also require synthesizing associations between different types of agents. For instance, which individual person is married to whom, who is the father of a 7 years old male going to a particular school, etc. Such information is very useful in realistic modelling and microsimulation of short term decisions like who gets to take the car for work and long term decisions for instance, what type of dwelling a particular household will buy. A Markov chain Monte Carlo simulation based agents synthesis approach has been proposed by Farooq et al. (2012). At core, the approach used Gibbs sampler to draw from the joint distribution of agent attributes using the available data. Among other advantages, they also demonstrated that the approach can reproduce the joint distribution better than the conventional fitting based approaches. Here we extend the simulation based synthesis approach so that it can also generate the association among drawn agents of different types. Required skill set: Experience in data analysis and pre-processing; probability and statistic; coding in Java or C#
- Student: Paul Anderson, June 07, 2013
- Supervision: Bilal Farooq, Dimitrios Efthymiou
*Enhancement of Naville's Press Delivery Regulation Tool: An Exploratory Analysis*- The aim of this project is to explore data driven complementary strategies to the existing allocation strategy of Naville, in order to provide guidance for potential improvements of the existing allocation tool of the company. In this project the student will investigate the potential benefits of including a wider set of data in order to identify press demand patterns over time. Accounting for consumer profiles, detailed sale points data, geographical area, external events, etc., will enable a more accurate understanding and anticipation of demand fluctuations. Drawing from the results of this analysis we will provide recommendations for improvements of the existing tool used by Naville. The proposed exploratory project can form the basis for a further work on the challenging theme of modeling and predicting demand and optimizing distribution strategies in the context of declining and uncertain evolution of the press market.
- Student: Lea Kissling (SMA), June 07, 2013
- Supervision: Evanthia Kazagli, Amanda Stathopoulos
- In collaboration with Naville
*Optimization of Paris' Metro System*- The Metrolab (a joint venture between RATP (R�gie Autonome des Transports Parisiens) and Alstom) would like to conduct analysis of their current metro system in terms of metro schedules and pedestrian congestion in the stations. The aim of this project is to use optimization techniques to design more flexible dynamic timetables and partially to handle the pedestrian congestion in the stations. This project will be offered only for spring semester 2013.
- Student: Thomas Cibils (SMA), June 07, 2013
- Supervision: Tom�s Robenek, Jianghang Chen, Michel Bierlaire
- In collaboration with MetroLab
*Modelling car ownership duration*- Household vehicle ownership influences many aspects of travel demand, with pronounced impact for energy consumption, travel mode distribution, residential location patterns and city attractiveness. Despite a large number of vehicle choice models focusing on the type of car chosen, formal modelling of the timing and duration of ownership has received relatively little attention. Statistical models known as duration (hazard) models can be used to estimate the distribution of vehicle ownership lengths in a population. A central interest is to identify the determinants of the time that elapses between two automobile transactions, including characteristics of the car and household and macroeconomic/policy variables. In addition, the influence of less tangible factors such as expectations regarding the market, future vehicle launches, propensity for planning and personal aspirations may have a large impact on the timing of renewal and vehicle ownership duration. We have a large dataset available containing rich information on vehicle acquisitions and are looking for a student to collaborate on data elaboration, exploration and development of a duration model for vehicle ownership. Several assumptions for the hazard function and innovative determinants of ownership spells will be considered. The student should be familiar with management of large data, statistics/econometrics and have some notion of behavioral theories of decision-making.
- Student: Natalie Sauerwald (SMA), June 07, 2013
- Supervision: Amanda Stathopoulos, Aur�lie Glerum
- In collaboration with PSA
*Movement patterns of pedestrians on platforms*- To understand how people access a train station by means of trains, the arrival and departure pattern of pedestrians on platforms is of interest. In particular, the embarkation/disembarkation behavior of train passengers is an important factor for congestion in pedestrian facilities. The departure pattern of pedestrians awaiting to board a train has been shown to follow a beta distribution. In contrast to that, arriving passengers usually enter a train station as a very dense crowd, causing a theoretical inflow that exceeds the capacity of pedestrian facilities. The goal of this work is to mathematically describe the arrival and departure patterns caused by single trains as well as for platforms on which multiple trains follow each other in close succession. Very detailed pedestrian tracking data of platform 3/4 in Gare de Lausanne will form the basis of this analysis. Basic programming skills or a strong willingness to acquire such knowledge is desired.
- Student: Nicholas Alan Molyneaux, May 31, 2013
- Supervision: Flurin H�nseler, Amanda Stathopoulos
- In collaboration with SBB-CFF-FFS
*Development of a novel pedestrian flow simulator*- Due to a general increase in travel demand, pedestrian flows in railway stations are gaining importance. Space is getting scarce, pedestrian density is reaching critical levels, and walking times are getting longer. To better understand these phenomena, we are currently developing a cell-based pedestrian flow simulator. Key features of this framework include its ability to i) realistically reproduce pedestrian density waves caused by arriving trains, ii) adequately describe multi-directional flows often present in public spaces, iii) consider differences in walking speeds among characteristic groups of pedestrians (such as passengers with luggage, handicapped people, travelers in a hurry, etc). To extend and implement this framework, basic programming skills or a strong willingness to acquire such knowledge is needed. Familiarity with fundamental fluid dynamics would be a plus. Extensive support and insight into ongoing research are provided.
- Student: Thomas M�hlematter, May 31, 2013
- Supervision: Flurin H�nseler, Bilal Farooq
*Movement patterns of pedestrians on platforms prior to/after train departures/arrivals in Gare de Lausanne: Exploitation of pedestrian tracking data*- In order to better understand how people access and leave a train station by means of trains, the arrival and departure pattern of pedestrians on platform is of interest. In particular, the embarkation/disembarkation behavior of train passengers is an important factor for congestion in pedestrian facilities. The departure pattern of pedestrians awaiting to board a train is expected to follow a beta distribution. In contrast to that, arriving passengers usually enter a train station as a very dense crowd, causing a theoretical inflow that exceeds the capacity of pedestrian facilities. This saturation effect needs to be taken into account when modeling arrival patterns. The goal of this work is to mathematically describe the arrival and departure patterns caused by single trains as well as for platforms on which multiple trains follow each other in close succession. Case studies for RER, RE and ICE/EC trains will be considered in order to better understand the influence of train size and type on these patterns.
- Student: Isabel Tovar, January 12, 2013
- Supervision: Flurin H�nseler, Marija Nikolic
*Dynamic estimation of pedestrian origin-destination within train stations: Exploitation of pedestrian tracking data and comparison to travel surveys*- OD demand will be estimated dynamically (i.e., as a function of time) based on observed pedestrian trajectories. Key in this process is a diligent choice of origins/destinations and their cordons, as well as a smart handling of �lost� pedestrians, i.e., people of which the algorithm looses track due to overcrowding or bad light conditions. Another challenge is finding a way to deal with multi-destination trips. For instance, a person entering a train station which goes to a ticket vending machine before boarding a train falls into this category. To help us tackle these issues, VisioSafe grants us access to some of their codes such that we can see how they have solved similar problems. Besides developing an OD estimation algorithm based on tracking data, visualization of OD demand is an important part of this thesis. Furthermore, it might be interesting to investigate how the estimated OD demand compares to previous estimates based on travel surveys (Anken et al., 2012) and pedestrian count data (ASE).
- Student: Ma�lle Zimmermann (SMA), January 12, 2013
- Supervision: Flurin H�nseler, Antonin Danalet
*Job Shop Scheduling in a Medical Parts Production Factory*- Student: Nathan Scheinmann (SMA), January 11, 2013
- Supervision: Michel Bierlaire, Nitish Umang
*Robustness and recovery in airline scheduling*- Student: Jonathan Blaiberg (SGC), January 11, 2013
- Supervision: Michel Bierlaire, Bilge Atasoy
*Process Optimization and School Schedules: New Legistlation, New Constraints*- Student: Ailin Zhang (SMA), January 11, 2013
- Supervision: Michel Bierlaire, Nitish Umang
*Optimisation des transports scolaires � Grandson I*- Analyser les probl�matiques, actuelles et futures, et proposer des solutions d'am�lioration d�coulant de l'organisation et de la gestion de l'ensemble des transports n�cessaires � la bonne marche du groupement et de l'arrondissement scolaire de Grandson (18 communes, 1'350 �l�ves, 70 classes, 12 sites scolaires). Ces probl�matiques r�sultent principalement d'une augmentation significative des co�ts li�s � l'introduction de la communaut� tarifaire vaudoise (Mobilis), de contraintes li�es � l'entr�e en vigueur d'HarmoS, des projets de constructions de l'association intercommunal, de l'�volution du r�seau r�gional des transports voire �galement des synergies � d�velopper avec le milieu parascolaire.
- Student: Clement Massart (SMA), January 11, 2013
- Supervision: Tom�s Robenek, Bilge Atasoy, Michel Bierlaire, Yves Guilloud, Association Intercommunale du Groupement et de l'Arrondissement Scolaires de Grandson
*Pedestrian flow simulation in Lausanne train station*- This project is about modelling, simulating, and analyzing the future expansion scenarios, in the context of pedestrian flows within Lausanne Gare (train station). We have already developed the modelling and simulation test-bed in a pedestrian flow simulator, called VisWalk. Here we would like to use more detailed data for existing and future demand in our models and analysis. A considerable amount of time will be spent to perform the calibration of various parameters using aggregate level speed and density related data. If time permits, we would also be interested in doing small infrastructure changes, specifically tapering of the intersections between PIs and ramps in order to evaluate their effects of the pedestrian flows. Ideal student should have some experience in using CAD software (AutoCAD, Microstation); should have some knowledge of databases; and be able to do basic programming. The student working on the project will have a great and unique opportunity to work directly with SBB CFF FFS, a major transportation software company called PTV AG, and a rapidly growing startup from EPFL called VisioSafe.
- Student: Nicolas de Lamberterie, January 10, 2013
- Supervision: Bilal Farooq, Marija Nikolic
- In collaboration with SBB CFF FFS, PTV AG, VisoSafe
*Population synthesis for large-scale agent based microsimulation*- Dynamic microsimulation of cities, including transportation, land use, and energy, require an initial dissaggregate population of agents (households and persons) as a key input. Due to privacy reasons, most of the times, governments do not provide access to full information on the population in census. This requires synthesizing the population from available datasets. In principle two datasets are necessary for such synthesis: a) disaggregate sample of households/persons; b) demographic summaries for all the zones in the study area. Techniques like Iterative Proportional Fitting (IPF) method are developed to use these datasets and generate a synthetic population of households and persons. A new technique for population synthesis has been developed at Transportation and Mobility lab. The scope of this project is to a) prepare datasets from the census and various other micro data samples b) run the simulations code based of the developed technique, for various scenarios (code is written in c++ and will be provided to the student. Only a very basic programming knowledge is required from the student) c) analysis and comparison of the results with other methods. This project will require developing understanding of the general methodology of population synthesis, preprocessing the datasets, familiarity with MySQL, GIS software, and some programming experience is recommended.
- Student: Lovisa Arnesson, January 10, 2013
- Supervision: Bilal Farooq
- In collaboration with European Union funded, SustainCity project
*Modelling the choice of vehicle in an extended framework*- It is becoming increasingly clear that models of vehicle choice need to find a way to measure complex consumer substitution patterns across products and over time, while accounting for a wealth of features that modulate the buying experience. This means that planning, acquisition and use of the vehicle is linked through features such as attitudes, life-event changes, status aspirations and perceptions of making a good deal. We have a large dataset available containing rich information on vehicle acquisitions and are looking for a student to collaborate on data elaboration, exploration and modelling that factors in richer behavioral variables than is common in traditional vehicle choice models. Methodologically the choice of vehicle will be modeled using random utility discrete choice demand systems. The student should be familiar with management of large data, statistics/econometrics and have some notion of behavioral theories of decision-making. The work will start with exploring the structure in the data, formulating simple models to identify some constructs and segments in the data then move towards a more formal choice model with perceptual/attitudinal components.
- Student: Areg Gevorgyan (SMGT), January 07, 2013
- Supervision: Amanda Stathopoulos
*Generation and Simulation of MATSim plans for Brussels*- The objective of this project is to generate travel plans for a synthetic population for the city of Brussels and simulate their travel behavior with the transport microsimulation software MATSim. The plans will be generated based on available census and travel survey data. The network for Brussels will be provided. The project considers the implementation of a prototype (simplified) model and a sensitivity analysis of the simulation results
- Student: Sona Hunanyan (SMA), July 30, 2012
- Supervision: Ricardo Hurtubia
*Optimizing Security Staff Operations at Geneva Airport*- Geneva airport is the second largest airport in Switzerland. Airport is capable of easily handling 80-100 landings and take-offs per hour. However one of the major bottlenecks today is the passenger handling capacity. The airport terminal area can handle up to 3000 passengers per hour. In recent times, passenger congestion is frequently building up at the airport. Because of the geographical reasons, it is not easy to expand the terminal building. As a result, it may be fruitful to attempt reducing congestion by efficient handling of the passengers and not letting the passengers wait too long to be serviced. Security screening is the most important area for departing passengers. Optimizing the operating costs for security personnel at airports is a complex problem due to a number of reasons. Each passenger and their corresponding hand baggage need to undergo security screening before entering the boarding gates. Even though the passengers and the baggage need to move together, the rate of service for the two can be vastly different. Security personnel work over specific shift times and need to be provided with suitable meal breaks. Staff members can work full-time or part-time, with a minimum of four hours per day. Passenger arrival pattern at an airport can be extremely uneven. Flight activities also tend to be non-uniform while passenger service expectations and staffing inflexibilities due to shift durations can make the problem even more complex. In this work, we would use the flight schedule and service criteria to develop a method to find optimal shift timings and the mix of full-time and part-time workers such that the overall costs are minimized and the service criteria conditions are fulfilled. Term Project (Master Project Pre-Study) Deliverables � Determine global parameters for passenger arrival rates, service times and shift times at different times of the day and days of the week for both passengers and baggages � Develop and implement a cost optimization MIP model with discrete time intervals Masters Project Deliverables � Adapt the deterministic linear model to account for non-linear passenger arrival and service rates and implement the same � Build a robust optimization model to capture vastly varying arrival and service rates. Determine the various ways to capture model stability with special emphasis on recoverability � Perform sensitivity analysis and compare the results of the stochastic model with simulation � Use the results to make recommendations: For example, create a separate queue or sub-queue for passengers without baggage, or passengers whose flights depart in 20 mins should be brought ahead of the queue, etc. � Develop and implement the model for staff rostering at the security screening Apart from expertise in modeling, the student is expected to be able to implement his model and write his own codes in a standard programming language, such as C or C++ Desired Masters Project Deliverables � Evaluate the tendency for staff to take leaves (including sick leaves) and vacation (subject to data availability) � Plan for contingencies in your model Project Organization The student would be expected to update us on the progress and revert to us for queries on a pre-decided day of the week. The student would be expected to update us on the progress and revert to us for queries on a pre-decided day of the week. A midterm presentation would be scheduled on Thursday, 10.11.2011. At the completion of the term project, a report will be delivered (both in paper as well as electronic form) before the 13.01.2012. The final oral presentation for the term project will be scheduled on 11.01.2012. Similarly, the Masters project would be due before the 01.06.2012 while the oral presentation for Masters project will be scheduled between 18.06.2012 and 29.06.2012 or a mutually convenient and agreed date. All the files, programs, codes, data and report associated with the project must be delivered before these date. All reports will be submitted in two copies to TRANSP-OR Lab and GVA Airport. References � Dowling, D., Krishnamoorthy, M., Mackenzie, H., and Sier, D. (1997). Staff rostering at a large international airport. Annals of Operations Research, 72:125-147. � Ernst, A., Jiang, H., Krishnamoorthy, M., and Sier, D. (2004). Staff scheduling and rostering: A review of applications, methods and models. European journal of operational research, 153(1):3-27. � Gilliam, R. (1979). An application of queueing theory to airport passenger security screening. Interfaces, 9(4):117-123.
- Student: MAHMOUD KHAROUF, June 20, 2012
- Supervision: Michel Bierlaire, Prem Kumar, Nitish Umang, VINCENT-RUBEN JIMENEZ, GVA AIRPORT
*Sensitivity analysis for a new generation of aircraft: Clip-Air*- Clip-Air is an innovative air transportation system based on modularity. By design, loading units (capsules) can be detached from the carrying unit (wing) which has several advantages in terms of fleeting operations. To quantify these advantages an integrated schedule design and fleet assignment model is developed for both standard planes and Clip-Air. The comparative analysis has shown that there is a potential increase in the transportation capacity thanks to modularity of Clip-Air. Since Clip-Air is only exists in a simulation environment, the parameters regarding the design of the Clip-Air are based on estimation. A sensitivity analysis should be carried out to see the impact of the estimated parameters on the results. The objective of this project is to identify the parameters to which the model is more sensitive.
- Student: Joseph Abisaleh (SGC), June 08, 2012
- Supervision: Bilge Atasoy
*Positioning Clip-Air among other transportation systems as a multi-modal flexible aircraft*- Clip-Air is an innovative air transportation system based on modularity. By design, loading units (capsules) can be detached from the carrying unit (wing) which has several advantages in terms of fleeting operations. To quantify these advantages an integrated schedule design and fleet assignment model is developed for both standard planes and Clip-Air. The comparative analysis has shown that there is a potential increase in the transportation capacity thanks to modularity of Clip-Air. To see the impacts of Clip-Air with a systematic perspective it is important to build analogies with existing transportation systems. The novel feature of Clip-Air is its flexible transportation capacity and it is similar to the case of railways where the train cars are assigned to the locomotives. Moreover, the multi-modal aspect of Clip-Air has strong similarities with maritime transportation where standard load units are transported in different transportation modes. Starting from these analogies we can analyze the similarities and differences between the existing transportation systems and new air transportation system Clip-Air. Similarities will strengthen the basis of this new idea and the differences will justify the need for new models and methodologies to analyze the added value of Clip-Air.
- Student: Jonathan Blaiberg (SGC), June 08, 2012
- Supervision: Bilge Atasoy
*Tracking Pedestrians with WiFi Traces*- Gathering data about pedestrian localization and tracking indoor is a hot topic today. WiFi traces to track pedestrian paths have been collected on EPFL Campus. The poor quality and the scarcity of WiFi localization precludes the use of traditional map matching methods. This project aims at adapting methods recently developed for Smartphone GPS data.
- Student: Yusen Bian (SMA), June 08, 2012
- Supervision: Antonin Danalet
*Transportation mode choice models including word data*- Recently, there has been an emphasis in the discrete choice literature on the introduction of attitudes and perceptions into discrete choice models. We are interested to see how these factors impact on choice.

A joint work with social scientists has led to the development of new surveys which include questions on the perception of transportation modes. In the framework of a survey conducted with CarPostal, the following question was asked:

"For each of the following transportation modes, indicate 3 adjectives that characterize them the best:

The car is: 1)________ 2)________ 3)________

The train is: 1)________ 2)________ 3)________

etc."

After this survey, a second online survey was conducted to collect information on how individuals would situate the adjectives reported in the first survey (e.g. stressful, relaxing, full, etc.) on a scale of comfort. For example, respondents were ask to rate adjective 'relaxing' on a scale from -2 to 2, with -2 indicating a total discomfort and 2 indicating a total comfort. In addition to this, they had to report some socio-economic information (languages spoken at home or work, mother tongue, level of education, etc.).

This project has two goals:

1. Model of the effect of the socio-economic information of the respondents of the second survey on their ratings of the adjectives.

2. Integrate the model developed in 1. into a discrete choice model to explain the transportation mode preferences. - Student: Peng Cui (SMA), June 08, 2012
- Supervision: Aur�lie Glerum
*Analyse des fr�quentations de bus en Suisse*- Ce projet de semestre porte sur une analyse des donn�es de fr�quentation de plusieurs lignes de bus � travers la Suisse. Il s'agit d'analyser le lien entre la fr�quentation et diff�rents autres facteurs tels que la fr�quence de la ligne, des variables temporelles (jour de la semaine, heure de la journ�e), le type de ligne, le bassin (densit� de population, emplois) ou encore le lien avec une gare CFF (pr�sence, mais aussi �ventuellement fr�quence des trains dans cette gare, ou du moins type de gare). Ce projet permet de travailler sur des donn�es d'une grande richesse, au sein d'un projet de recherche multidisciplinaire en cours en lien avec l'industrie et d'autres laboratoires de l'EPFL, en particulier la CEAT.
- Student: Suzy Polka (SSC), February 17, 2012
- Supervision: Antonin Danalet, Ythier Jeanne
*Mode choice model for the city of Nice*- The goal of this project is to implement a mode choice model for the city of Nice. This model will be used by a public transport operator in order to identify the potentials for increasing market shares for public transport in this area, based on a better understanding of the demand structure between public transport and car. The model will be estimated on data collected from a recent Household Travel Survey which sampled around 6500 households. Information on travel times and costs is available for trips performed by public transport but similar information has to be collected for private transport modes. The model will be implemented and estimated using BIOGEME, an estimation software developed by the Transport and Mobility Laboratory. The project will be conducted in collaboration with Veolia Transport.
- Student: My Hang Nguyen (SGC), January 17, 2012
- Supervision: Ricardo Hurtubia
- In collaboration with Veolia Transport
*Robustness and Recovery in Berth Allocation Problem*- Student: Wei Li (SMGT), January 13, 2012
- Supervision: Michel Bierlaire, Nitish Umang
*Multi-modal transportation modeling for a new generation of aircraft: Clip-Air*- Clip-Air is an innovative air transportation system based on modularity. By design, loading units (capsules) can be detached from the carrying unit (wing) which has several advantages in terms of fleeting operations. To quantify these advantages an integrated schedule design and fleet assignment model is developed for both standard planes and Clip-Air. The comparative analysis has shown that there is a potential increase in the transportation capacity thanks to modularity of Clip-Air. As a further investigation, the performance of Clip-Air is needed to be analyzed from a network perspective. Repositioning of Clip-Air capsules by other means of transport, specifically railways, will give this multi-modal network viewpoint. The repositioning is believed to increase the profit especially in case of unbalanced demand between airport pairs. Furthermore, since Clip-Air capsules are completely detached from the wing, the storage and transfer costs are expected to be reduced. The aim of this project is to develop an appropriate model for the repositioning of Clip-Air capsules and obtain an integrated fleeting model. The tasks of this semester project are the following: 1. Get familiar with the concept of fleet assignment and already developed models. 2. Make a literature search on empty container management models. 3. Develop an appropriate model for the repositioning of capsules to be integrated into the existing fleet assignment model. Repositioning model will determine the flow of empty capsules throughout the network considering the carrying costs of capsules by rail and storage cost of capsules at airports. 4. Obtain preliminary results for a few data instances. 5. Evaluate the effect of repositioning.
- Student: Jonathan Blaiberg (SGC), January 13, 2012
- Supervision: Bilge Atasoy, Matteo Salani
*Optimizing Train Design in Capacitated Railroads*- The problems of Train Design, Railroad Blocking and Train Assignment are fairly complex and often observed in the railroad industry. Efficient solution methods to these problems bring a huge potential to achieve enhanced operational performance and dramatically reduced costs. Blocking is defined as an activity where a set of shipments arriving at or commencing from a certain node station and departing to another particular node station, or further, are grouped together and sent across as the same train to minimize costs and exploit economies of scale. This problem has marked similarities with the airline scheduling which operates flights across a predetermined hub and spoke network. The problem considered here not only necessitates determining the �right� hubs and �right� trains to be scheduled on the network, but also scheduling the shipments on appropriate trains between the hub station yards and spoke station yards so that the overall costs are minimized. In the problem considered by us, we are given a network comprising a set of nodes and arcs. We are also given a set of shipments with their origin and destination nodes. We are given a range of costs such as the cost of car travel per mile, cost of train travel per mile, cost of starting a train, cost of grouping (also referred to as classifying or blocking) shipments at an intermediate station of a train, cost of train imbalance, cost of crew imbalance and the cost of a missed car that is not transported. It is also required that each train path overlaps one or more crew segments completely. Crew segment between two nodes will also always follow the shortest path between those two nodes. Thus a train cannot run on a section which is not on the path of a crew. Train imbalance is defined as the imbalance generated due to the fact that the number of outgoing and incoming trains at a node differ. Total train imbalance for the network is computed as the sum of imbalances at every node. Crew imbalance is generated due to the fact that a crew operates on a segment, but cannot find an operational train to return to their base. In addition to these considerations, there are specific requirements relating to the maximum number of trains that a shipment can travel on, the maximum number of blocking (or classifications or work events � as referred in the problem statement) allowed for each train, the maximum number of trains allowed on any arc and the limitation on the maximum train length and tonnage. The main objective of our efforts would be to find a cost minimizing set of feasible trains that operate on one or multiple crew segments completely. We would also need to determine the least cost assignment of shipments to these trains. Term Project Deliverables � Develop and implement a cost optimization single or multi-stage mixed integer program model � Solve the model using a mix of relaxations and heuristics and report results on two data sets � Prepare a comprehensive report on solution methods and future research tracks on this problem Apart from expertise in modeling, the student is expected to be able to implement his model and write his own codes in a standard programming language, such as Java or C# Project Organization The student would be expected to update us on the progress and revert to us for queries on a pre-decided day of the week. A midterm presentation would be scheduled on Thursday, 10.11.2011. At the completion of the term project, a report will be delivered (both in paper as well as electronic form) before the 13.01.2012. The final oral presentation for the term project will be scheduled on 11.01.2012. All the files, programs, codes, data and report associated with the project must be delivered before these date. All reports will be submitted in five copies to TRANSP-OR Lab, LUTS Lab, Dr. Prem Kumar and Mr. Burak Boyaci. One copy is for the student.
- Student: Stefan Binder, January 12, 2012
- Supervision: Michel Bierlaire, Prem Kumar, BURAK BOYACI, LUTS
*Mobility identification from smartphone GPS data*- We record data from smarpthones over 2 years from about 180 N95 smartphone user. The data includes, GPS, nearby Bluetooth devices, nearby WIFI spots, calendar, etc. This project aims at identifying mobility history (trips and destinations) from raw data. The project will be based on some existing solutions (with existing Java and Python code). And the student will improve or develop a new software to process the data, and generate and visualize the data. You can choose among Python, Java or C++ for the project. The objectives of the project are following (You can choose among them): 1. Identify trips (origin, destination and time) from the GPS data. 2. Detect transportation mode (car, or public transport, etc) from the trips.
- Student: Denis Garcia (SMA), January 11, 2012
- Supervision: Jingmin Chen, Ricardo Hurtubia
*Measuring Passenger Satisfaction using AirS@t Survey*- M1nd-set is an international market research agency specialized in air travel surveys and
research. The company conducts regular passenger satisfaction surveys among the major fullservice
airlines on different international market areas. M1nd-set manages reasonable
passenger response rates and over a third of their survey is administered on business-class
travelers who value passenger service.

At present, AirS@t survey captures the passenger satisfaction levels for different parameters, such as waiting times for check-in, boarding and in-flight services, staff friendliness, seat comfort, in-flight entertainment, meals, etc., that are perceived to drive the overall satisfaction of flying with a particular airline company. M1nd-set uses a specific method of calculating weights of these parameters, in the order of importance, and arriving at overall airline satisfaction levels. However we see some scope in applying more advanced scientific models to this data to gain a deeper perspective on the relative significance of these parameters. In addition, it is critical to understand if higher satisfaction levels with a particular carrier are actually translating into increased demands and thus increased revenues. This could also mean that we can test the sufficiency of the currently captured parameters and if there are some additional parameters that could be silently driving the demand.

M1nd-set is seeking fresh, innovative and out-of-the-box ideas to analyze the data mine at hand. They are willing to give access to the data base (under the umbrella of the enclosed NDA) to the student who brings an interesting research idea. Ideally the outcome of this research / analysis should be presented to airlines on conference(s) and/or published.

This project will be composed of the following stages: 1. Understanding basic airline industry domain, various players and AirS@t survey in that perspective 2. Literature review and discussion on new ideas 3. Preliminary data analysis 4. Application of fresh methodologies for data analysis, such as using Discrete Choice Models for analysis 5. Inclusion of additional questions on the survey that could provide new insights 6. Final presentation and report

Project will commence around mid February and would continue for about 4 1/2 months - Student: Lidija Stankovikj (SMA), June 30, 2011
- Supervision: Bilge Atasoy, Aur�lie Glerum, M1nd-set
*Battery life modelling*- In a context where electric vehicles are going to be released soon on the market, a high importance is given to the analysis of the degradation of their batteries. A key aspect of this research is to identify the factors that are responsible for a fast battery degradation, in order to give drivers advices on a battery-friendly driving.

The aim of the project is two-fold:

1) Refine an existing model of the state of charge of the battery, in order to identify which are the factors explaining the battery discharge and how they affect it.

2) Analyze the impact of different driving patterns and other factors on battery degradation. The student will have to get familiar with an existing battery life model owned by ZEM. - Student: Fran�ois Anken (SMA), June 30, 2011
- Supervision: Aur�lie Glerum, Responsable externe ZEM
- In collaboration with ZEM
*Travel behavior models: an Abu Dhabi case study*- In this project, the student aims at studying the state-of-the-art demand modeling method- ologies in the transportation field. She will learn discrete choice models, and relevant tech- niques, such as simulation, and apply them in the study of mode choice and/or driving behavior. An Abu Dhabi case study will be carried out.
- Student: Laur�ne Aigrain (SGC), January 30, 2011
- Supervision: Michel Bierlaire, Jingmin Chen
*Prototype MATSim model for Brussels*- Student: Sohrab Sahaleh (SGC), January 20, 2011
- Supervision: Gunnar Fl�tter�d, Ricardo Hurtubia
*An analysis of a potential implementation and investigation Singapore's road pricing system within the MATSim transportation microsimulation*- Student: Youssef Mezdani, January 20, 2011
- Supervision: Gunnar Fl�tter�d, Alexander Erath
*Quantitative analysis of urban sustainability indicators*- Student: Timoth�e Vincent (SGC), January 20, 2011
- Supervision: Gunnar Fl�tter�d, Ricardo Hurtubia
*Estimation and simulation of bid-auction and choice location models*- Student: Thibaut Dubernet (SGC), January 20, 2011
- Supervision: Ricardo Hurtubia, Thomas Robin
*The urban development effects of the construction of a metro line*- Student: Aur�lien Odobert (SGC), January 20, 2011
- Supervision: Ricardo Hurtubia
*Integrating demand functions inside optimization model*- For the new air-transportation system CLIP-AIR we want to have a fleeting model which includes a demand model. The project requires 1. understanding of the concept, 2. implementing the model in a general purpose math language, 3. using a solver for the nonlinear mixed integer problem, 4. performing preliminary tests with given instances.
- Student: Nancy Moret (SMA), January 05, 2011
- Supervision: Bilge Atasoy, Matteo Salani
*Integrating the latent attitudes into mode choice*- In the classical mode choice modeling we have the modal attributes like time and cost, and the socio-economic information as explanatory variables. However there are unobservable variables like attitudes, perceptions, lifestyle etc. which are effective in travel behavior. In this project aim is to come up with integrated choice models including these latent variables.
- Student: Lidija Stankovikj (SMA), January 05, 2011
- Supervision: Bilge Atasoy, Aur�lie Glerum
*Optimizing Staffing Plans at Airports*- Minimizing operating costs for maintaining ground personnel at airports is a complex problem due to uneven flight activities, passenger service expectations and staffing inflexibilities due to shift durations. In this work, we would use the flight schedule and service criteria to develop a method to find optimal shift timings that considers non-productive time due to activity changeovers, the mix of full-time and part-time workers and passenger waiting time criteria.
- Student: Fran�ois Anken (SMA), January 05, 2011
- Supervision: Prem Kumar
*Analysis of Electric Vehicle Data*- The project aims to apply statistical analytics and basic mathematical techniques to analyze a unique data set of electric vehicle usage, and a cutting edge battery life model. The student will analyze the impact of different driving patterns and other factors on battery degradation � a key question facing the transportation industry today. The student will be exposed to the latest developments in mobility and electric vehicle development, and will have constant access to supervisors that will guide him / her to better understand the technical and industrial context of the project. The student will have great autonomy in choosing the mathematical and analytic techniques he/she is familiar with to run simulations, stress the data sets, and incorporate new analytical models as necessary.
- Student: Parmeet Singh Bhatia, January 05, 2011
- Supervision: Aur�lie Glerum, Responsable externe ZEM
- In collaboration with ZEM
*Insertion d'un nouveau moyen de transport a�rien sur la base d'avions de transport existants*- Insertion d'un nouveau moyen de transport a�rien sur la base d'avions de transport existants Il s'agit de cr�er une base de donn�es comprenant les avions de ligne les plus repr�sentatifs utilis�s par les diff�rentes compagnies dans les transports de passagers et de fret. Il faudra remplir un tableau par types et constructeurs d'avions: en tonnages, surfaces alaires, masses max et min, charges, nombre de passagers, altitudes, rayon maximal de chacun, ainsi que les vitesses de d�collage, de croisi�re et d'atterrissage. La recherche, la mise en place et le classement de l'ensemble de ces donn�es permettront de faire des correspondances par type de missions, comme les courts courriers, moyen-courriers et long-courriers. Ceci constitue l'�tape N�1 Cette classification permettra de d�finir l'�tape N�2, qui sera exprim�e par une s�rie de graphiques faisant correspondre les caract�ristiques aux missions. Par exemple rechercher des correspondances de surfaces alaires et de poids ou de surfaces et de masses en corr�lation � un rayon d�action maximum, etc. Les �tudiants chercheront et exprimeront ces concordances entre ces types d'avions par une s�rie de graphiques explicites sachant que les donn�es collect�es sont optimis�es aux maximums par les lois de la m�canique des fluides, v�ritable base commune � tout constructeur d'avions. L'�tape N�3 consistera, avec les donn�es qui seront remises aux �tudiants, � faire un tableau r�unissant un maximum d��l�ments concernant le projet Clip-Air. Ceci au travers des deux publications existantes qui seront remises aux �tudiants. Ces donn�es seront compl�t�es avec l'aide des personnes travaillant dans le projet. L'�tape N�4 sera d'ins�rer le projet Clip-Air dans les graphiques de l'�tape N�2. Ceci permettra aux �tudiants de tirer des conclusions qui situeront le projet Clip-Air par comparaison, dans: - la classe op�rationnelle la plus proche -son potentiel de transports -d'�valuer "les manques" ou "les trop", qui permettrait de correspondre � une classe op�rationnelle donn�e (en tenant compte de facteurs sp�cifiques au projet Clip-Air qui seront discut�s � cette �tape).
- Student: Laurene Aigrain & Dethier Daphn� (SGC), January 05, 2011
- Supervision: Claudio Leonardi, Bilge Atasoy
*Destination choice models for a free bicycle system*- Several cities around the world are implementing �free bicycle systems� that consist of a network of stations were bicycles are available for users to �pay and ride�. Usually these systems allow users to return the bicycle in a different station from the one where it was taken. The project consists in estimating destination choice models that should allow to predict the station where a bicycle will be returned, given the origin, the time of the day, the length (in time) of the trip and the characteristics of the surroundings of each station. The project considers 3 main stages: Data analysis, model estimation (with the software BIOGEME) and model validation.
- Student: Zehra Onen (SMA), June 30, 2010
- Supervision: Ricardo Hurtubia, Thomas Robin
*Simulateur de mouvements de pi�tons*- Les mod�les de mouvement de pi�tons permettent de simuler le comportement de foules. Ils sont utiles dans le domaine de la s�curit�, de l'�vacuation, mais �galement pour la plannification urbaine. En effet de nos jours pour des raisons environementales, de nombreux centres-ville sont interdits aux voitures et transform�s en zones pi�tonnes. Ces mod�les servent � simuler le comportement des pi�tons dans des contextes urbains pr�d�finis afin de choisir l'am�nagement qui sera le mieux adapt�. Ce projet concerne l'impl�mentation d'un mod�le de mouvements de pi�tons, mod�le d�velopp� � l'EPFL au sein du laboratoire Transp-or
- Student: Viljami Laurmaa (SMA), June 20, 2010
- Supervision: Thomas Robin, Javier Cruz, Mamy Fetiarison
*Optimisation d'horaires a�riens*- Dans le cadre du transport a�rien, qui est sujet � de nombreux retards, il est essentiel de planifier les horaires de mani�re � mieux contr�ler ces retards. Le but de ce projet est d'�tudier, impl�menter et tester un mod�le d'optimisation qui maximise le temps de connexion des passagers, afin de r�duire le nombre de connections rat�es dans le cas o� des retards sont observ�s.
- Student: Sezin Afsar (SMA), June 04, 2010
- Supervision: Niklaus Eggenberg
*Algorithme de g�n�ration de vols de repositionnement pour am�liorer la r�paration d'un horaire perturb�*- Dans le domaine du trafic a�rien, un probl�me r�current est de r�parer un horaire perturb� suite � des �v�nements tels que de mauvaises conditions m�t�orologiques, une d�faillance technique d'un avion, etc. La probl�me de r�paration d'horaire est largement �tudi� dans la litt�rature. Malheureusement, si la majorit� des approches existantes consid�re la possibilit� d'int�grer des vols dits "de repositionnement" (des vols additionnels qui ne sont pas pr�vus initialement), aucune d'entre elles n'�tudie la g�n�ration des vols � consid�rer. Il s'agit donc d'�laborer un algorithme permettant de g�n�rer de bons candidats � am�liorer la solution de r�paration, sans pour autant consid�rer tous les vols de repositionnement possibles.
- Student: Sabine Luisier (SMA), June 04, 2010
- Supervision: Niklaus Eggenberg
*The Tactical Berth Allocation Problem: hierarchical vs integrated models in the context of container terminal operations*- Container terminal operations have received increasing interest in the scientific literature over the last years and operations research techniques are more and more used to improve terminal's efficiency and productivity. In particular, the simultaneous optimization of decision problems that are usually solved hierarchically by terminal's planners represents nowadays a promising research trend. The Tactical Berth Allocation Problem (TBAP) deals with the integration of the berth allocation problem (BAP) and the quay crane assignment problem (QCAP). It aims to schedule incoming ships over a time horizon, assigning them a berthing position and a certain quay crane profile (i.e. number of quay cranes per working shift). These decisions are strictly correlated, since the number of quay cranes assigned to a ship affects its expected handling time, and thus has impact on the scheduling in the berth allocation plan. The problem has been modeled as a mixed integer program and housekeeping costs generated by the berth assignment are taken into account by a quadratic term in the objective function. The aim of this project is twofold: (i) to compare the integrated approach (modeled in TBAP) to the standard hierarchical approach (first solve BAP, then QCAP); (ii) to analyze the impact of different BAP objective functions on yard operations, by taking into account housekeeping costs.
- Student: Luca Furrer (SMA), June 04, 2010
- Supervision: Ilaria Vacca
*Testing the algorithm for generating path observation from GPS data*- This project aims at using and testing an innovative probabilistic path observation generation algorithm on location data and comparing against state-of-the-art map matching algorithms.
- Student: Jensen Anders Fjendbo (SGC), January 15, 2010
- Supervision: Michel Bierlaire, Jingmin Chen
*Visualization of Cell Phone Data on Google Earth*- This project aims at providing to our data collection campaign participants a convenient and lively way of visualizing cell phone data which is collected from their cell phones and stored on web servers. Various kinds of data are display on google earth to show chains of users� activities, with time-space information provided by GPS data.
- Student: Raoul Neu (SIN), January 15, 2010
- Supervision: Jingmin Chen
*Un mod�le pr�liminaire d'UrbanSim pour Lausanne*- Depuis longtemps l'importance de l'interaction entre la forme urbaine, les infrastructures de transports et la demande de transport a �t� reconnu. Par contre ce n'est que r�cemment que des m�thodes analytiques tel que des syst�mes de mod�lisation de transport et d'occupation du sol ont �t� d�velopp�es pour pouvoir mieux comprendre ces interactions. UrbanSim est un syst�me de mod�lisation d'occupation du sol qui devient de plus en plus utilis�. L'objectif de ce projet est de monter un mod�le pr�liminaire d'UrbanSim pour la ville de Lausanne.
- Student: Sarah Droz (SGC), January 15, 2010
- Supervision: Ricardo Hurtubia
*Analysis of Transport Mode Choice in Trieste*- In the transport planning context, survey data have been collected between 2002 and 2003 in Trieste. Three modes of transport have been considered : car, motorcycle and bus. Transportation is a major application field of Discrete Choice Models (DCM) since they can capture lots of situations where a choice is performed. In order to study the mode choice of transport users, DCMs have been developed and calibrated with these collected data. Analysis of the results pointed out some prediction inaccuracy. This means that improvement of the model still has to be made. The aim of this project is to study the travelers choice behavior with the existing models and investigate possible improvements of the models specification.
- Student: Alexandre Khelifa (SGC), January 15, 2010
- Supervision: Mamy Fetiarison
*Modeling the effects of spatio-temporal flexibility in activity scheduling*- In travel demand modeling there is an increasing interest in understanding and modeling the planning or scheduling of activities over space and time. This is due to the fact that a better understanding of activity scheduling processes will contribute to the development of activity scheduling models and an understanding of the short (week) dynamics. In the literature, very little is known about the activity scheduling processes and the spatio-temporal flexibility of activities. For an individual, each (work, leisure, shopping) activity in a day can be classified according to its level of flexibility in routine, pre-arrange and spontaneous in the two dimensions, space and time. Based on his spatio-temporal constraints, an individual is making a decision to assign its degree of flexibility. The objective of this research is to investigate how socio-demographics of individual/households, life-stage, ICT access (cell phone/internet), accessibility to services, and activity attributes (time, duration, week day) affect the spatio-temporal flexibility of out-of home activities. The analysis will be done using data from a survey conducted in Qu�bec City from 2002-2006 to estimate activity-choice models.
- Student: Laetitia Bettex (SGC), January 15, 2010
- Supervision: Ricardo Hurtubia
*Modeling the link between transport and land-use with UrbanSim*- Location of activities in the city has an important effect on travel demand and on the transport system�s performance. Land-use models are used to forecast location in the city, in order to help decision-making for urban and transport planning. Because of its flexibility, UrbanSim is an increasingly popular alternative for integrated land-use and transport modeling. However, UrbanSim is not exactly an integrated model but a land-use model that works together with a transportation model. This makes relevant to understand if the interaction between transport and land use is properly modeled by UrbanSim. The objective of this project is to implement the latest stable version of UrbanSim for the city of Brussels, using data that was already collected to implement an older version of the model. The project also considers a deeper analysis on how UrbanSim accounts for the relation between transport and land use.
- Student: Peter Goodings (SGC), January 15, 2010
- Supervision: Ricardo Hurtubia
*Game theory applied to ambush avoidance*- This project continues along the stream of the previous project "Minimizing risk of ambush for vehicle routes". The goal of the project is to apply game theory to determine the optimal mixed strategy to select as set of vehicle routes. Each route comes along with the expected maximal payoff when the route is implemented. A strategy to determine the game matrix is to be conceived.
- Student: Peter Goodings Swartz (SGC), January 15, 2010
- Supervision: Matteo Salani
*Finance and Discrete Choice Models*- Default risk evaluation for credit cards and mortgages, credit ratings determination, probabilities estimation of acquisitions and mergers of firms (used to guide investment), are very complex financial tasks. They require a very good expertise of the field. This is due to the high number of information that decision makers need to account for. In addition, information could be very heterogeneous in term of source and impact on the decision itself. Models can help financial decision maker in their tasks. For instance, classification methods are mainly used to model financial decisions. Discrete Choice Models (DCM) have been successively applied to many fields in the past 40 years, such as transportation or marketing. Compared to machine learning methods they have the advantages to explicitly model causal relations between dependant variables and exogenous attributes, and to avoid data over-fitting. DCMs start to be used in the financial field. The aim of this project is to investigate DCM use in a financial context, then find relevant problem to which it can be applied and finally illustrate those concepts on a real case study.
- Student: In�s Azaiez (SMA), January 10, 2010
- Supervision: Thomas Robin
*Mode choice modelling with qualitative aspects inclusions*- Discrete Choice Models (DCM) are widely used in transportation to explain mode choice. Objective attributes have been commonly used to describe the different alternatives, such as travel time or travel cost. Kaufmann et al. (2001) have conducted some transportation mode choice surveys. In addition to the classical data collection, they have included questions about experiences and perceptions of transportation modes. The obtained database is large and contains lots of respondents sociological aspects, difficult to apprehend in a classical DCM, due to their qualitative nature. In order to go through such issues, J.L.Walker (2001) has proposed a new modelling framework based on DCM and latent concepts. She used schemes to describe links between variables. The aim of the project is to identify complex causal links between sociological aspects and transportation mode choice, based on the data cited above, and then derive a new modelling framework.
- Student: Zehra Onen (SMA), January 10, 2010
- Supervision: Thomas Robin
*Exp�rience des moyens de transport et choix modal*- Lorsque l�on choisit d�utiliser un moyen de transport plut�t qu�un autre, ind�pendamment des temps de d�placements et des co�ts compar�s des alternatives en pr�sence, l�usager a des pr�f�rences. Celles-ci sont li�es � son exp�rience des moyens de transport et � la perception qu�il en a. Les mod�lisations du choix modal ne rendent qu�imparfaitement compte de cette dimension, intrins�quement qualitative. Pour la traiter, le LaSUR a d�velopp� depuis une dizaine d�ann�es un dispositif de citation d�adjectifs, appliqu� � de gros �chantillons de population lors d�enqu�tes de mobilit�. Nous proposons comme sujet de Master de mod�liser sur la base des donn�es disponibles, l�impact de l�exp�rience sensorielle des moyens de transports sur le choix modal.
- Student: Seyed Tavakoli (SGC), June 30, 2009
- Supervision: Michel Bierlaire, Thomas Robin
*Minimizing risk of ambush for vehicle routes*- Vehicle routing problems are known problems in which a fleet of vehicles is routed through a network to collect (or deliver) items from customers. The objective of routing problems in an hostile environment is to prevent ambushes (for valuables deliveries). The goal of routing under potential attacks is to design safe routes in order to minimize the risk of being exposed to dangers. This project is designed to investigate and implement innovative routing strategies.
- Student: Ga�tan Duyckaerts, Peter Goodings Swartz (SGC), June 19, 2009
- Supervision: Matteo Salani
*Analysis of consumer behaviour in terms of product preference/choice.*- This project will be conducted in collaboration with the Nestl� Research Center. Quantitative studies are frequently used in the food industry in order to determine whether a product is superior to its competitor(s). Many types of studies exist, but this project focuses on a specific type of study involving only two products and in which consumers are asked to evaluate both products with regard to different criteria (such as flavour, appearance, texture, etc.) and to choose the product they prefer. Socio-demographic characteristics as well as information on consumption habits are also collected during the test. The aim of this project is to explore a database containing about 100 studies that have been conducted over the past years on a same product category in different countries. Such studies are usually analyzed by the means of descriptive statistics in order to answer the two following questions: -Which product do consumers prefer? -Why do consumers prefer this product? In this project, we propose to analyze the studies by making use of discrete choice modelling. This technique allows understanding and modelling the behaviour of consumers in a quantitative way when they are exposed to such choice situations, i.e. the choice between two products. Discrete choice models should allow identifying and quantifying the effect of both product attributes and consumer characteristics on the preference.
- Student: Aur�lie Glerum (SMA), June 12, 2009
- Supervision: Thomas Robin, Micha�l Th�mans
- In collaboration with Nestl�
*Effets sur le trafic d'une nouvelle jonction autorouti�re � Chavannes*- Actuellement, il n�y a qu�une seule jonction autorouti�re entre celles de la Bl�cherette et de Malley pour desservir l�Ouest Lausannois : la jonction de Crissier. Or deux nouvelles jonctions sont en projet � Ecublens et Chavannes. Selon les choix effectu�s pour les voies d�acc�s � l�autoroute, ces jonctions peuvent diminuer les nuisances en r�duisant les kilom�tres parcourus, surtout hors autoroute ou les augmenter en amenant du trafic de transit ind�sirable dans des zones � pr�server. Le projet consiste � examiner des variantes d�am�nagement du r�seau dans le sud de Renens, �ventuellement � en sugg�rer de nouvelles, et � �valuer ces diverses variantes en s�aidant du logiciel Emme de simulation du trafic.
- Student: Annie Faniry Andriamanorohasinjafiniarivo Ravalitera (SGC), June 05, 2009
- Supervision: Jean-Pierre Leyvraz
*Implementation of attribute processing strategies in advanced discrete choice models*- Student: Carol Kirchhofer (SMA), February 03, 2009
- Supervision: Michel Bierlaire, John Rose, ITLS, University of Sydney
*Extending the framework for MEV discrete choice models*- Student: Lorenza Santini (SMA), February 03, 2009
- Supervision: Michel Bierlaire, Mogens Fosgerau, DTU, Denmark
*Estimation of household location choice models*- Location of activities in the city has an important effect on travel demand and on the transport system�s performance. Land-use models are used to forecast location in the city, in order to help decision-making for urban and transport planning. To predict the location of agents it�s first necessary to estimate �location choice models� (which are usually a part of the land-use model). These models are estimated through maximum-likelihood methods from observed location data. The aim of the project is to estimate several different household location choice models for the same city, using different specifications for the household�s utility function and testing different methods to deal with �attribute�s thresholds� in the utility. The estimations will be made using Biogeme, databases will be provided.
- Student: Antonin Danalet (SMA), January 12, 2009
- Supervision: Ricardo Hurtubia
*Est-il possible de r�duire le nombre de pan�listes dans une �tude DTS (Dominance Temporelle des Sensations) sans alt�rer la qualit� des r�sultats?*- La m�thode de la Dominance Temporelle des Sensations (DTS) permet de suivre l��volution des perceptions sensorielles en bouche au cours de la mastication d�un produit alimentaire. Elle consiste simplement � demander au pan�liste de s�lectionner la caract�ristique dominante du produit au cours de la mastication. Par exemple, si le produit est une barre de c�r�ales, le pan�liste doit indiquer au cours de la mastication d�une bouch�e si le produit est plut�t croquant, friable, collant ou p�teux. Cette caract�ristique dominante peut changer au cours du temps. Sur l�ensemble du panel, cette m�thode permet de dessiner les courbes d��volution de chaque descripteur sensoriel au cours du temps. Cette m�thode est relativement r�cente et les premi�res �tudes ont �t� r�alis�es avec un nombre de pan�listes tr�s important (environ 50 �valuations de chaque produit). L�objectif de ce projet est de tester si cette m�thode donne des r�sultats aussi satisfaisants avec un nombre de pan�listes r�duit. Le travail consistera donc � : se familiariser avec la m�thode DTS et la construction des courbes, d�velopper un programme permettant de construire ces courbes pour un sous-ensemble de pan�listes, g�n�rer les r�sultats pour plusieurs tailles de panel en utilisant les donn�es de plusieurs �tudes DTS existantes au centre de recherche Nestl�, proposer une m�thode pour comparer les r�sultats des panels de taille r�duite avec le panel complet, appliquer cette m�thode et analyser les r�sultats, r�diger un rapport pr�sentant la d�marche et mettant en avant les principales conclusions.
- Student: Glerum Aur�lie (SMA), January 11, 2009
- Supervision: Thomas Robin, Micha�l Th�mans, Nicolas Pineau (Nestl� Research Center)
- In collaboration with Nestl�
*Minimizing risk of vehicle routes in valuables collection from banks*- Vehicle routing problems are well known combinatorial problems in which a fleet of vehicles is routed through a network to collect (or deliver) items from customers. The objective of routing problems is to minimize operational costs in terms of distance traveled such that all customers are visited and all operational constraints are respected. In the context of logistic services delivered to credit institutes, e.g. the collection of valuables or distribution of coins, the total distance traveled is no more the primary objective to optimize. For logistic companies is more convenient to design {\em safe} routes in order to minimize the risk of being robbed. Beside risk minimization, logistic companies commit to provide a certain level of service to credit institutes in terms of pick-up frequencies.
- Student: Fabrice Piat (SGC), January 11, 2009
- Supervision: Matteo Salani
*Is it possible to reduce the number of panelists in a TDS (Temporal Dominance of Sensations) study without altering the quality of the results?*- Student: Aur�lie Gl�rum (SMA), January 06, 2009
- Supervision: Thomas Robin, Michel Bierlaire, Micha�l Th�mans
- In collaboration with Nestl� Research Center
*La mod�lisation de transport de la r�gion Lausannoise avec PTV Vision*- La mod�lisation de transport est un aspect fondamental de la planification de transport. Plusieurs diff�rents logiciels existent pour mod�liser la performance des r�seaux de transports urbains. Les logiciels EMME, TransCAD et PTV Vision sont parmi les plus utilis�s au monde pour mod�liser le trafic. Au sein du laboratoire TRANSP-OR existent d�j� des mod�les EMME et TransCAD de Lausanne. Pour faire conna�tre aux �tudiants de l'EPFL les diff�rentes options disponibles pour la mod�lisation de transport, le d�veloppement d'un mod�le PTV Vision de Lausanne est pr�vu. Le but de ce projet est d'utiliser les donn�es existantes pour monter un mod�le PTV Vision de la ville de Lausanne.
- Student: Chen Lu (SSC), July 15, 2008
- Supervision: Zachary Patterson
*D�convolution de signaux g�ochimiques*- Le but g�n�ral de la m�thode est de conna�tre, � partir du relev� de la concentration d'un �l�ment chimique dans l'air, la part naturelle, et la part anthropique(celle d�e � l'homme, par exemple la pollution). Concr�tement � partir de donn�es existantes, nous voulons impl�menter et r�soudre une maximisation de vraisemblance, afin de d�terminer les deux composantes du signal.
- Student: Gfeller Nicolas (SMA), June 30, 2008
- Supervision: Thomas Robin
*Dynamic Traffic Assignment in Lausanne*- Dynameq is a new breed of equilibrium dynamic traffic assignment (DTA) for use on large, congested networks, distributed by INRO (www.inro.ca). Dynameq gives planners a view into dynamic traffic conditions, and provides rational scenario comparisons that are only possible with an equilibrium-based solution. It has been successfully used in cities like Montr�al. The purpose of the project is to develop a Dynameq model of Lausanne. The challenge consist in gathering relevant available data, and identify additionnal data which would need to be collected. The objective is to obtain a prototype model for which the missing pieces are well identified. The project will be conducted at the Centre de Recherche sur les Transports (University of Montr�al), in close collaboration with the staff of INRO.
- Student: Vidaud Marine (SGC), June 20, 2008
- Supervision: Michel Bierlaire, Mahut Michael
*Development of mode choice models in Trieste*- The discrete choice models are very relevant concerning the transport mode choice. A survey on the daily trips has been conducted in Trieste, Italy, in 2000-2001, led by the municipality. The study of the resultant data base will permit to understand the Triestan�s habits, along with developing transport mode choice models. The aim of this project is to analyse real data (the dataset described above), perform a complete modelling process, together with statistical tests, and prepare appropriate documentation.
- Student: Violin Alessia (SMA), June 17, 2008
- Supervision: Michel Bierlaire
*Optimization of Lausanne's traffic signal timings*- The aim of this project is to optimize the traffic signal settings of the network of the city of Lausanne.

The phases of the project are as follows. The student will:

- provide an overview of the existing formulations for this optimization problem;

- propose a formulation, this formulation may be taken from exisiting studies;

- implement the problem on a subnetwork of the city of Lausanne, the student will be given access to a Matlab code which may need to be adapted according to the formulation;

- analyse and discuss the results.

Basic knowledge of Matlab is required for this project. - Student: Yanjun Zhang (SGC), June 06, 2008
- Supervision: Carolina Osorio Pizano
*Analyse g�ographique pour l'impl�mentation d'un prototype de mod�le int�gr� de transport et d'occupation du sol pour la r�gion lausannoise*- UrbanSim est un syst�me de mod�lisation transport et occupation du sol qui devient de plus en plus utilis�. Se projet se fera dans le cadre d'un projet plus large pour d�velopper un prototype d'un mod�le int�gr� de transport et d'occupation du sol pour la r�gion lausannoise. Ces mod�les demandes beaucoup de donn�es socio-d�mographiques ainsi que g�ographiques pour la r�gion d'�tude. L'objectif de ce projet est de contribuer au d�veloppement des donn�es pour le tableau `Gridcells' du mod�le en d�veloppement. En particulier le projet aura comme but : l'identification des donn�es manquantes pour ce tableau, l'identification des sources pour les donn�es manquantes, le traitement de ces donn�es et l'incorporation dans le tableau `Gridcells.'
- Student: Bettex Laetitia (SGC), May 30, 2008
- Supervision: Zachary Patterson
*Algorithmes On Line pour le CVRP avec Demandes Al�atoires*- EN - The project copes with the capacitated vehicle routing problem (CVRP) in the case of unknown demand volumes of the customers. The aim is to abord the problem with an on line strategy.
The student will first familiarize with CVRP and on line algorithms and then develop and test an on line strategy.

FR -Le projet propose d'aborder le probl�me de troun�es de v�hicules avec contraintes de capacit� (CVRP) dans le cas o� les volumes des demandes des clients ne sont pas connus. Il s'agit ici d'aborder le probl�me avec une approche on line. L'�tudiant devra d'abord se familiariser avec le CVRP et les probl�mes on line puis d�velopper et tester une strat�gie. - Student: Boukriba Sami (SSC), May 23, 2008
- Supervision: Niklaus Eggenberg
*D�terminer les vols de repositionnements pour un horaire a�rien perturb�*- Lors de l'ex�cution d'un horaire, il arrive souvent que ledit horaire devienne irr�alisable. Dans le cas du transport a�rien, pour r�agir � un tel �v�nement, il s'agit de retarder ou d'annuler certains vols, voir m�me faire des trajets "� vide" pour repositionner les avions. Dans ce projet, il s'agit d'�laborer une technique permettant d'identifier, �tant donn� l'horaire devenu irr�alisable et l'�tat des avions, quel(s) vol(s) de repositionnement sont � consid�rer pour minimiser autant les co�ts que les annulations de vols et les retards.
- Student: Karker Amin, Tournier Sebastien (SSC), May 23, 2008
- Supervision: Niklaus Eggenberg
*Analyse de donn�es requises pour un mod�le int�gr� de Lausanne*- Depuis longtemps l'importance de l'interaction entre la forme urbaine, les infrastructures de transports et la demande de transport a �t� reconnu. Par contre ce n'est que r�cemment que des m�thodes analytiques tel que des syst�mes de mod�lisation de transport et d'occupation du sol ont �t� d�velopp�es pour pouvoir mieux comprendre ces interactions. UrbanSim est un syst�me de mod�lisation qui devient de plus en plus utilis�. Ce projet repr�sente une phase pr�paratoire pour le d�veloppement d'un mod�le UrbanSim pour la r�gion lausannoise.
- Student: Maret Jonathan (SGC), January 18, 2008
- Supervision: Zachary Patterson
*Calibration of on Integrated Transportation Land-use Model - UrbanSim for Brussels*- Transportation and infrastructure planning requires a good understanding of future transportation demand. Traditionally, transportation demand analysis has focused primarily on the transportation system independent of its relationship with land-use and urban form. Integrated Transportation and Land-use Models (ILUMs) explicitly model these interactions. The TRANSP-OR laboratory currently has an operational land-use model (UrbanSim) for the city of Brussels in Belgium. The purpose of this project is to is to fine-tune UrbanSim for Brussels by improving the location, developer and land-price models. The analysis will take advantage of GIS land-use data for Brussels. The project will include an application of the modeling system to a practical transportation and land-use planning problem. The project will be undertaken in cooperation with Stratec of Brussels.
- Student: Zemzemi Fatima and Stoitzev Iordanka (SMA), January 18, 2008
- Supervision: Zachary Patterson
*Dynamic Traffic Assignment in Lausanne (pr��tude)*- Le logiciel Emme permet de comparer des variantes de r�seaux routiers urbains en se basant sur une affectation des d�placements des automobilistes de leur origine � leur destination. Cette affectation est macroscopique (on consid�re des flux globaux de d�placements) et statique (les conditions d��coulement sont cens�es �tre constantes durant toute la p�riode consid�r�e). D�autres mod�les comme Dynameq et AIMSUN se basent sur une affectation microscopique (chaque v�hicule est mod�lis�) et dynamique (les conditions peuvent changer au cours du temps). Ces mod�les demandent plus de donn�es, mais permettent en �change d��valuer des mesures comme des changements dans la gestion des carrefours et de repr�senter l��volution au cours du temps. L�agglom�ration lausannoise dispose d�une banque de donn�es Emme et, pour sa partie la plus centrale, d�une banque AIMSUN. Le projet de master, qui se d�roulera chez INRO � Montr�al, consiste � cr�er � partir de ces donn�es et �ventuellement d�autres donn�es disponibles, une banque de donn�es Dynameq, de documenter le processus utilis� et d�identifier les donn�es suppl�mentaires n�cessaires pour am�liorer la qualit� de cette banque.
- Student: Vidaud Marine (SGC), January 14, 2008
- Supervision: Michel Bierlaire, Jean-Pierre Leyvraz
*Mod�le de choix discret*- Les mod�les de choix de discret sont tr�s pertinents concernant le choix de mode de transport. Une enqu�te sur les trajets a �t� men�e d�ao�t � d�cembre 2003 par l�ETHZ, � Frauenfeld et ses abords dans le canton de Thurgovie, en Suisse. Celle-ci concerne 230 personnes, suivies pendant 6 semaines et provenant de 99 m�nages. L��tude de la base de donn�es r�sultante permettra de mieux conna�tre les habitudes des voyageurs, ainsi que de d�velopper un mod�le de choix de mode de transport. Le but de ce projet est de s�initier � l�analyse des mod�les de choix discret leurs applica- tions sur des donn�es r�elles, en l�occurence les donn�es d�crites ci-dessus.
- Student: Weber Caroline (SMA), January 09, 2008
- Supervision: Thomas Robin
*Mod�les GEV et MEV*- Les mod�les de choix discrets ont �t� pr�dominants dans l'analyse de transport durant ces derni�res ann�es. Le mod�le MNL(Multinomial Logit) est particuli�rement appr�ci� gr�ce � ses capacit�s calculatoires et sa forme analytique. Il est obtenu� partir de la loi de Gumbel, appel�e aussi loi des valeurs extr�mes de type I. D'une part, une version multivari�e (MEV) a �t� propos� par McFadden (1978). D'autre part, diff�rentes lois monovari�es aux valeurs extr�mes peuvent �tre rassembl�es en utilisant la sp�cification dite g�n�alis�e (GEV). Le but de ce projet est d'une part de ma�triser les concepts li�s aux mod�es MEV (Mul- tivariate Extreme Value) et GEV, afin d'investiguer la possibilit� de combiner les deux. D'autre part, les mod�eles d'utilit� multiplicatifs (Fosgerau & Bierlaire 2007) permettent de faire un lien avec les mod�les GEV ( Fosgerau, short note). Ce lien sera aussi investigu�, en vue de la r�alisation d'un projet de master li� � ce sujet avec Mogens Fosgerau � Copenhague.
- Student: Santini Lorenza (SMA), January 07, 2008
- Supervision: Michel Bierlaire
*Mod�le de classes latentes en analyse de choix discret*- Le but de ce projet est de s'initier � l'analyse des mod�les de choix de classes latentes et leurs application sur des donn�es r�elles en vue de pr�paration d'un projet de master concernant le choix de billets d'avion.
- Student: Kirchhofer Carol (SMA), January 07, 2008
- Supervision: Michel Bierlaire
*Graphical interface for a JAVA simulator***Project aim:**The aim of this project is to implement a graphical interface for an existing discrete event simulator.

**Description:**

Numerical simulators are often used to evaluate the impact of changing the characteristics of an already existing system (e.g infrastructure improvements in highways). Such computer models can also be used to evaluate modifications under hypothetical scenarios that would be difficult to observe in the real world (e.g. predict future congestion levels, based on demographic forecasts.) These numerical simulators mimic the behavior of complex systems, yielding performance measures that are rich in information. In order to take full advantage of this detailed information, and to be able to summarize it in a user friendly manner, a graphical interface is crucial.

The aim of this project is to implement a graphical interface for a numerical simulator.

The student will be given a JAVA implemented discrete event simulator that studys the flow of units (e.g. vehicles, pedestrians) through a network (e.g. highways, corridors). The aim will be to implement an attractive graphical interface that will summarize and illustrate the main performance measures that the simulator yields.

- Student: Fetiarison Mamy Nirina, August 31, 2007
- Supervision: Carolina Osorio Pizano
*Etude du comportement d'achat des consommateurs*- Le comportement des consommateurs durant la d�marche d'achat est un ph�nom�ne compliqu� et propre � chaque personne, qui regroupe des param�tres observables, comme le choix final, et des composants latents, comme p. ex. le raisonnement avant ce choix. La mod�lisation de l'impact de marketing cibl� (via design des panneaux publicitaires) est du plus grand int�r�t pour la compr�hension de ce comportement. Le but de ce projet est d'unifier les donn�es venant des sources diff�rentes et d'am�liorer le mod�le de la d�marche compl�te d'achat bas� sur les donn�es d'une �tude r�elle de tra�age des yeux.
- Student: Alexandre Xavier (SMA), June 29, 2007
- Supervision: Michel Bierlaire
*Study of Optical Flow techniques for motion estimation in video sequences*- In image processing, when dealing with video sequences, it is usually very useful to have an estimation of the motion in order to obtain spatio-temporal information. To achieve this, the most common approach is to compute the optical flow, which is the velocity field of the apparent motion between frames.

The aim of this project is to study the most relevant approaches to compute the optical flow and implement them using C, C++ or JAVA. - Student: Epely-Chauvin Ga�l (SGC), June 29, 2007
- Supervision: Javier Cruz
*Deadlock detection*- The spillback phenomenon frequently arises in urban traffic networks under congestion. If the
network contains loops then spillback is a potential source of dealocks, also known as gridlocks.
In this project the student will be given acces to a network simulation tool. Based on empirical
studies of simple networks under deadlock the student will:

1) identify preformance measures that indicate the presence of deadlocks

2) propose analytical performance measures that may help detect deadlocks

3) validate the proposed performance measures - Student: Anken Nicolas (SMA), June 29, 2007
- Supervision: Carolina Osorio Pizano
*A Survey of Active Integrated Land-use Models around the World*- Traditional travel demand modeling has tended to ignore the important interactions between urban form and transportation demand and the performance of the transportation system. Integrated transportation land-use models (ILUMs) explicitly model these interactions. These models are becoming increasingly popular. Better understanding these models requires a better knowledge of how they are applied in different contexts. The purpose of this project is to undertake research to provide a summary of active ILUM applications around the world.
- Student: Vignon Olayitan (SGC), June 29, 2007
- Supervision: Zachary Patterson
*Simulation of finite capacity queueing networks*- The aim of this project is to reproduce via numerical simulation the behaviour of a network of finite capacity queues. The simulation tool is to be both implemented and validated. The tool shall be used to analyse the HUG (Geneva University Hospital) hospital room network.
- Student: Meier Pirmin (SMA), February 17, 2007
- Supervision: Carolina Osorio Pizano
*An Integrated Land Use Model Application to Brussels using UrbanSim*- The interrelationship between urban form, transportation infrastructure and transportation demand has long been recognized. More recently, analysts have been developing Integrated Transportation and Land-use Models (ILUMs) to better understand and quantify these interrelationships. As a result, several modeling options are now available to develop ILUMs. One such model has already been applied to the city of Brussels in Belgium. UrbanSim is an increasingly popular alternative for integrated land-use modeling. The current study is intended to test the feasibility of applying UrbanSim to a city for which a fair bit of transportation and land-use data already exist, within a medium-term project timeline. The project is being undertaken in collaboration with Stratec in Brussels.
- Student: Samartzis Lefteris (SMA), February 17, 2007
- Supervision: Zachary Patterson
*Mod�les de choix discret pour la reconnaissance des expressions faciales statiques*- Student: Danalet Antonin (SMA), February 16, 2007
- Supervision: Michel Bierlaire
*Analysis of a Recovery Network for an Airline Recovery Method*- Airline schedules are often disrupted because of unforeseen events like lateness or bad weather. If the schedule becomes unfeasible, the scheduler has to recover from the actual state in order to get a new feasible schedule, either by canceling or postponing flights or even rerouting planes. The model often used is a time-space recovery network which encodes several possible recovery decisions for each plane in the fleet. It's main disadvantage is its size. The student will have to familiarize with airline scheduling and network modeling in order to analyze and simplify as much as possible the recovery network. The aim would be be able to end up with a reduction algorithm that throws network of smaller size by means of number of nodes and arcs amd eventually test the reduction algorithm on existing instances.
- Student: Messina Daniele (SMA), February 16, 2007
- Supervision: Niklaus Eggenberg
*Etude des mod�les de mouvements de pi�tons*- Etude des mod�les de mouvements de pi�tons, revue de la litt�rature, recensement des mod�les existants dans divers domaines tels que l'architecture, planification urbaine, gestion de grands �v�nements, �vacuation...etc. Le but est d'identifier ces divers mod�les, d�terminer leurs hypoth�ses, contextes d'utilisation, et faire une �tude comparative.
- Student: Li Xiangchun (SMA), February 16, 2007
- Supervision: Thomas Robin
*Validation de mod�les de choix de route*- Student: Anken Nicolas (SMA), February 15, 2006
- Supervision: Emma Frejinger
*Detection of behavioral inconsistency in Revealed Preferences surveys*- Student: Laurence de Torrent� and Ariane Wenger (SMA), February 01, 2006
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Detection of behavioral inconsistency in Revealed Preferences surveys*- Student: Julie Marc (SMA), June 23, 2005
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Discrete choice models: development of case studies*- Student: Fr�d�ric Anken (SMA), June 22, 2005
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Analysis of choice sets for route choice models*- Student: Fort�n Garcia Ver�nica, June 20, 2005
- Supervision: Emma Frejinger
*Analyse de l'approche sous-r�seau pour la mod�lisation de choix de route*- Student: Gilli�ron Fanny (SMA), June 20, 2005
- Supervision: Emma Frejinger
*Deterministic Correction of the Multinomial Logit Model for Route Choice Analysis*- Student: Regis C�line (SSC), June 20, 2005
- Supervision: Emma Frejinger
*Different strategies for trust-region size management*- Student: Emmanuel Leclercq (SMA), June 20, 2005
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Stated Preferences Survey for the choice of exchange university*- Student: Eric Von Aarburg (SMA), June 20, 2005
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Utilisation d'un syst�me g�ographique pour un probl�me de logistique*- Student: Emery Sarah and Roth Isabelle (SMA), February 15, 2005
- Supervision: Emma Frejinger
*Route Choice Analysis using GPS Data*- Student: Lindb�ck Rolf (SSC), February 15, 2005
- Supervision: Emma Frejinger, Micha�l Th�mans
*Optimisation of the Operating Suit*- Student: Pivin Edward (SMA), February 15, 2005
- Supervision: Emma Frejinger
*Calibration of models for transportation demand in the context of real-time applications*- Student: Mohamed Rhmari Tlem�ani (SSC), June 25, 2004
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Adaptation of GSM for unconstrained nonlinear optimization*- Student: Anouck Brossard and Sarah Degallier (SMA), June 23, 2004
- Supervision: Micha�l Th�mans, Frank Crittin, Michel Bierlaire
*On the convergence of multi-dimensional filter methods*- Student: Lionel Dumartheray (SMA), June 23, 2004
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Identification of Coherent Behavior using Linear Programming*- Student: Ittig Oliver (SMA), June 20, 2004
- Supervision: Emma Frejinger, Micha�l Th�mans
*Dynamic O-D matrices estimation with iGSM*- Student: Olivier Grandjean (SMA), February 01, 2004
- Supervision: Frank Crittin, Micha�l Th�mans, Michel Bierlaire
*Testing GSM on unconstrained nonlinear optimization problems*- Student: Mina Adel Latif (SSC), June 20, 2003
- Supervision: Micha�l Th�mans, Frank Crittin, Michel Bierlaire
*Discrete choice models to capture drivers behavior in response to real-time traffic information*- Student: Thomas Quentin Maillard (SMA), June 20, 2003
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Empirical analysis of the correlation in discrete choice models*- Student: Steve Salom (SSC), February 01, 2003
- Supervision: Micha�l Th�mans, Michel Bierlaire
*Activity organization and ICT*- Selon indications ult�rieures.
- Student: Laetitia Bettex (SGC)

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