L�a Ricard

This page reports only the academic work registered in the databases of the Transport and Mobility Laboratory, and is not necessarily a comprehensive list of the work by L�a Ricard.

Personal webpage

Technical reports [1]

2024

Ricard L., Bierlaire M. (2024). 50 years of behavioral models for transportation and logistics. Report TRANSP-OR 220408


@TechReport{RicaBier24,
  author = {L\'ea Ricard and Michel Bierlaire},
  title = {50 years of behavioral models for transportation and logistics},
  institution = {Transport and Mobility Laboratory, Ecole Polytechnique F\'ed\'erale de Lausanne},
  year = {2024},
  type = {Technical Report},
  number = {TRANSP-OR 220408},
  address = {Lausanne, Switzerland}}}

Talks [6]

2024

Ricard L., Bierlaire M. The stochastic electric dial-a-ride problem with recourse September 03, 2024. International Conference on Operations Research 2024, , Munich, Germany.


@Misc{Ricard24_ORMunich,
  author = {L\'ea Ricard and Michel Bierlaire},
  title = {The stochastic electric dial-a-ride problem with recourse},
  howpublished = {\url{https://transp-or.epfl.ch/documents/talks/Ricard24_ORMunich.pdf}},
  year = {2024},
  note = {Presented at International Conference on Operations Research 2024, , Munich, Germany}}}

Ricard L., Desaulniers G., Lodi A., Rousseau L. Stochastic optimization of bus schedules July 21, 2024. International Symposium on Mathematical Programming, GERAD, Montreal, Canada.


@Misc{Ricard24_ISMP,
  author = {L\'ea Ricard and Guy Desaulniers and Andrea Lodi and Louis-Martin Rousseau},
  title = {Stochastic optimization of bus schedules},
  howpublished = {\url{https://transp-or.epfl.ch/documents/talks/Ricard24_ISMP.pdf}},
  year = {2024},
  note = {Presented at International Symposium on Mathematical Programming, GERAD, Montreal, Canada}}}

Ricard L., Desaulniers G., Lodi A., Rousseau L. Stochastic optimization of bus schedules June 30, 2024. European Conference on Operational Research, DTU, Copenhagen, Denmark.


@Misc{Ricard24_EURO,
  author = {L\'ea Ricard and Guy Desaulniers and Andrea Lodi and Louis-Martin Rousseau},
  title = {Stochastic optimization of bus schedules},
  howpublished = {\url{https://transp-or.epfl.ch/documents/talks/Ricard24_EURO.pdf}},
  year = {2024},
  note = {Presented at European Conference on Operational Research, DTU, Copenhagen, Denmark}}}

Ricard L., Desaulniers G., Lodi A., Rousseau L. Stochastic optimization of bus schedules June 27, 2024. Swiss OR days, HEG-Genève, Geneva, Switzerland.


@Misc{Ricard24_SwissOR,
  author = {L\'ea Ricard and Guy Desaulniers and Andrea Lodi and Louis-Martin Rousseau},
  title = {Stochastic optimization of bus schedules},
  howpublished = {\url{https://transp-or.epfl.ch/documents/talks/Ricard24_SwissOR.pdf}},
  year = {2024},
  note = {Presented at Swiss OR days, HEG-Gen\ève, Geneva, Switzerland}}}

2023

Ricard L., Desaulniers G., Lodi A., Rousseau L. Strategies for the electric bus scheduling problem with battery degradation: A stochastic perspective October 16, 2023. INFORMS 2023, Phoenix, Arizona, USA.


@Misc{Ricard23_INFORMS,
  author = {L\'ea Ricard and Guy Desaulniers and Andrea Lodi and Louis-Martin Rousseau},
  title = {Strategies for the electric bus scheduling problem with battery degradation: A stochastic perspective},
  howpublished = {\url{https://transp-or.epfl.ch/documents/talks/Ricard23_INFORMS.pdf}},
  year = {2023},
  note = {Presented at INFORMS 2023, Phoenix, Arizona, USA}}}

Ricard L., Desaulniers G., Lodi A., Rousseau L. The stochastic multi-depot electric vehicle scheduling problem with recourse September 07, 2023. 11th Symposium of the European Association for Research in Transportation, ETH Zurich, Zurich, Switzerland.


@Misc{Ricard23_HEART,
  author = {L\'ea Ricard and Guy Desaulniers and Andrea Lodi and Louis-Martin Rousseau},
  title = {The stochastic multi-depot electric vehicle scheduling problem with recourse},
  howpublished = {\url{https://transp-or.epfl.ch/documents/talks/Ricard23_HEART.pdf}},
  year = {2023},
  note = {Presented at 11th Symposium of the European Association for Research in Transportation, ETH Zurich, Zurich, Switzerland}}}

EPFL courses [2]

Spring 2024

Optimization and Simulation.
- Level: PhD
- Section: Doctoral program in Civil and Environmental Engineering
- Lecturers: Michel Bierlaire, Cloe Cortes Balcells, L�a Ricard, Pavel Ilinov
- Webpage: http://transp-or.epfl.ch/courses/OptSim2024

Fall 2023

Introduction to optimization and operations research .
- Level: Bachelor
- Sections: Mechanical Engineering, Civil Engineering, Environmental Sciences and Engineering, Electrical and Electronics Engineering
- Lecturer: Michel Bierlaire
- Teaching assistants: Fabian Torres, L�a Ricard, Marija Kukic, Tom Haering, Negar Rezvany

MSc theses [2]

2024-2025

Integrating Advanced Discrete Choice Models into the Capacitated Facility Location Problem with Decentralized Priority Queues, Quoc Dang Tran (Mathematics)
- Supervision: Tom Haering, Léa Ricard
- External expert: Virginie Lurkin

2024

Stochastic on-demand electric vehicle routing and charge scheduling, Mohamed Essayouti (Mathematics)
- Supervision: Léa Ricard, Tom Haering, Michel Bierlaire
- External expert: Claudia Bongiovanni

Semester projects [2]

2024-2025

Optimization of railway maintenance planning, Younis Bouzar

Supervision: Léa Ricard, Marija Kukic, Michel Bierlaire
This project aims to develop a model for optimizing railway maintenance planning. The objective is to implement an efficient algorithm that can be applied in real-world networks. Cracks that develop on the rail surface, such as 'head checks', can lead to catastrophic failures if not promptly addressed. To mitigate this risk, preventive grinding is applied. In this work, the objective is to optimize the frequency of preventive grinding interventions for each geometric element of the railway, ensuring both rail safety and operational efficiency. The optimization model utilizes head check forecasts and existing interval scheduling data as inputs.

2024

A computational comparison of open-source branch-and-price solvers, Jules Schneuwly

Supervision: Léa Ricard, Fabian Torres, Michel Bierlaire
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:

Michel Bierlaire, EPFL. Sun Dec 1 18:51:06 2024