Sandra U. NGUEVEU Maître de Conférences HDR / Associate Professor HDR Summary     Publications     ResearchProjects     Service     PhD     HDR     Software     Teaching     C.V.(28.01.2019)

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Research themes

• Energy optimization

  Solving optimization problems from real-world applications in electrical engineering such as energy optimization in hybrid electric vehicles, or optimization of water pumping and desalination processes, etc. Address the combinatorial optimization challenge of integrating energy sources, with constraints related to their physical, technological and performance characteristics, in combinatorial optimization problems, in particular in deterministic scheduling models such as job-shop scheduling or resource-constrained project scheduling.

• Optimization in graphs

  Graph-based modeling and solution of problems from various fields of applications: shortest paths in multi-modal graphs representing the multiplicity of transportation modes in an urban environment, dynamic airspace sectorization, Nash equilibrium for multiagent project scheduling problems, etc. Polyhedral analysis, extended formulations, decomposition and hybrid solution methods for vehicle routing problems.

Interns/PhD/PostDoc supervision

• PhD (September 2021 - )
• Subject: Robust design and integrated management of microgrids under uncertainties and high rate of penetration of intermittent renewable sources
• PhD student: Corentin Boennec
• Supervisor: Bruno Sareni, Sandra U. Ngueveu
• Funded by the French Ministery for Higher Education and Research


• PhD (September 2023 - )
• Subject: Iterative commodity aggregation and disaggregation methods for transportation network design problems
• PhD student: Louis Bonnet
• Supervisor: Simon Bélières, Sandra U. Ngueveu
• Funded by ANR AdLib


• PhD (October 2023 - )
• Subject: Real-time decision-making systems for omnichannel order management in a context of eco-responsible retail
• PhD student: Théo Le Brun
• Supervisor: Marie-José Huguet, Sandra U. Ngueveu
• Industrial partner (PhD funding = CIFRE): ONESTOCK - "Retail Responsable" chair

Completed

• PhD (March 2021 - April 2024)
• Subject: Combinatorial aspects of the hydraulic subproblem of daily production management
• PhD student: Alexandre Heintzmann
• Supervisors: Christian Artigues, Sandra U. Ngueveu, Cécile Rottner, Pascale Bendotti
• Industrial partner (PhD funding = CIFRE): EDF
• Successfully defended on the 5th of April 2024


• PhD (October 2020 - November 2023)
• Subject: Piecewise linear approximation of bivariate functions with a bounded error for the solution of mixed integer nonlinear problems
• PhD student: Aloïs Duguet
• Supervisor: Sandra U. Ngueveu
• Funded by the French Ministery for Higher Education and Research
• Successfully defended on the 22th of November 2023


• Research Engineer (October 2022 - September 2023)
• Subject: Preparatory study for the optimization of OMS-induced deliveries in a context of an eco-responsible retail
• Engineer: Théo Le Brun
• Supervisor: Sandra U. Ngueveu
• Funded by the research and education chair "Retail responsable"


• PhD (September 2016 - November 2019)
• Subject: Branch-and-price algorithm for multi-objective vehicle routing problems
• PhD student: Estèle Glize
• Supervisors: Nicolas Jozefowiez and Sandra U. Ngueveu
• Funded by the French Ministery for Higher Education and Research
• Successfully defended on the 29th of November 2019


• PostDoctoral research (April 2017 - August 2018)
• Subject: Modélisation et résolution de problèmes de localisation et affectation avec contraintes et objectifs relatifs à une application de e-commerce
• PostDoct: Azeddine Cheref
• Supervisors: Christian Artigues, Emmanuel Hebrard and Sandra U. Ngueveu
• Funded by the FEDER/Région Easynov ONE STOCK PERFORMANCE
• Industrial partner: DEVATICS


• PhD (March 2013 - January 2018)
• Subject: Optimization of the regrouping of air traffic sectors
• PhD student: Tambet Treimuth
• Supervisors: Daniel Delahaye (ENAC) and Sandra U. Ngueveu
• Funded by ENAC (National School of Civil Aviation) and the DGAC (Directorate-General of Civil Aviation)
• Successfully defended on the 19th of January 2018


• PhD (March 2013 - September 2016)
• Subject: Development of algorithms for the computation of multimodal itineraries and car-sharing
• PhD student: Grégoire Scano
• Supervisors: Marie-José Huguet and Sandra U. Ngueveu
• Industrial partner (PhD funding = CIFRE): MOBIGIS
• Successfully defended on the 8th of September 2016


• Research stay of PhD student (March 2014 - May 2014)
• Subject: Positions and Covering -based models and decompositions for the two-dimensional bin packing problem
• Student: Nestor Cid
• Phd Supervisor: Yasmin Rios. Research stay supervisor: Sandra U. Ngueveu
• type of funding: CONACYT (Mexico)


• PhD (September 2013 - June 2016)
• Subject: Multiobjective Cumulative Covering Routing Problems for Humanitarian Logistics
• PhD student: Leticia Gloria Vargas Suarez
• Supervisors: Nicolas Jozefowiez and Sandra U. Ngueveu
• Funded by ERASMUS MUNDUS LAMENITEC
• Successfully defended on the 24th of June 2016


• PhD (October 2010 - December 2013)
• Subject: Optimized and robust heuristics for the resolution of the energy management problem in hybrid electric vehicles
• PhD student: Mouloud Guemri
• Supervisors: Stéphane Caux (LAPLACE) and Sandra U. Ngueveu
• Funded by the French Ministery for Higher Education and Research
• Successfully defended on the 16th of December 2013


• PostDoctoral research (September 2011 - August 2012)
• Subject: Project scheduling in a distributed and cooperative mode
• PostDoct: Premsyl Šůcha
• Supervisors: Cyril Briand and Sandra U. Ngueveu
• Funded by the ANR ROBOCOOP


• Internship of level Bac+5 (February 2015 - August 2015)
• Subject: Scheduling with multiple energy sources: introducing reversible sources
• Supervisors: Christian Artigues, Pierre Lopez and Sandra U. Ngueveu / Funded by the PGMO grant (OREM)
• Internship of level Bac+4 (May 2014 - August 2014)
• Subject: Scheduling with multiple energy sources
• Supervisors: Christian Artigues, Pierre Lopez and Sandra U. Ngueveu / Funded by the PGMO grant (OREM)
• Internship of level Bac+5 (March 2014 - August 2014 then September 2014 - December 2014)
• Subject: MILP formulations for the feeding system of an assembly line: taking into account the energy efficiency
• Supervisors: Cyril Briand, Nicolas Jozefowiez and Sandra U. Ngueveu / Funded by the ANR ECO-INNOVERA EASY
• Internship of level Bac+5 (March 2013 - September 2013)
• Subject: Design and optimal Management of a water pumping and desalination process supplied with wind and solar energy
• Supervisors = Xavier Roboam, Bruno Sareni and Sandra U. Ngueveu / Funded by the LAPLACE
• Internship of level Bac+5 (March 2012 - August 2012)
• Subject: Multimodal itinerary involving car-sharing
• Supervisors = Marie-José Huguet, Christian Artigues and Sandra U. Ngueveu / Funded through the ARFRO project by the GDR-RO
• Internship of level Bac+2 (February 2011 - July 2011)
• Subject: Computer coding, tests and validation of algorithms that compute multimodal itineraries
• Supervisors = Marie-José Huguet, Christian Artigues and Sandra U. Ngueveu / Funded by the LAAS

Responsability/Participation in funded research projects

• The research and education "Responsible Retail" Chair (September 2022 - September 2027)
• Subject: Responsible Retail
• Partners: Onestock, Toulouse INP, CNRS, LAAS, N7 DEV
• Link


• ANR blanc project (September 2022 - September 2027)
• Sujet: An Aggregation-Disaggregation LIBrary for sequential decision models (AD-LIB)
• Affiliations of the participants: LAAS, TBS (Toulouse), INRIA (Bordeaux) and IMT (Bordeaux)
• Link

Completed

• PGMO (September 2018 - September 2020)
• Subject: Hybrid Optimization for Hydro Valleys (HYBOPTHYD)
• Affiliations of the participants: LAAS, CNAM (Paris), LIMOS (St-Etienne), EDF (France)


• FEDER/Region project (September 2016 - December 2018)
• Subject: One stock performance
• Affiliations of the participants: Company DEVATICS, LAAS


• ANR Blanc project (September 2015 - September 2018)
• Subject: Co-modal freight transportation chains: an approach based on physical internet (PICOMODALITE)
• Affiliations of the participants: LAAS, INRIA (Lille, France), Mines Paris Tech (Paris, France) and DHL supply chain (France)


• PEPS-CNRS (June 2016 - December 2016)
• Subject: Integration of energy sources selection in scheduling: from theory to practice (ISEO)
• Affiliations of the participants: LAAS, LAPLACE


• PGMO (September 2016 - September 2018)
• Subject: Optimizing energy allocation using lot sizing models (OPAL)
• Affiliations of the participants: LAAS, LIP6/CNAM (Paris), LIMOS (St-Etienne)
• Link


• ANR Blanc project (September 2013 - September 2016)
• Subject: Optimization methods for the integrated study of complex decisional problems (ATHENA)
• Affiliations of the participants: LAAS, LI (Tours, France), LIMOS (Clermont-Ferrand, France) and HEUDIASYC (Compiègne, France)


• PGMO (September 2013 - September 2015)
• Subject: Optimization under constraints from multiple energy sources (OREM)
• Affiliation of the participants: LAAS
• Link


• Regional ANR ECO-INNOVERA project (September 2012 - February 2016)
• Subject: Energy-Aware feeding SYstems (EASY)
• Affiliations of the participants: LAAS, Universidad de Navarra (Navarre, Spain) and University of Skövde (Skövde, Sweden)


• ANR Blanc project (February 2012 - February 2015 )
• Subject: Management of networks of services door to door efficient for fret transportation (RESPET)
• Affiliations of the participants: LAAS, INRIA (Lille, France), LIA (Avignon, France), JASSP (Paris, France) and DHL (Paris, France)


• AAP project of the INSIS (September 2012 - September 2013)
• Subject: Scheduling problem under energy constraints (OCrE)
• Affiliations of the participants: LAAS and LAPLACE (Toulouse, France)


• ARFRO project of the GDR-RO (September 2011 - September 2013)
• Subject: Computation of multimodal paths and multicriteria in large graphs
• Affiliations of the participants: LAAS, LI (Tours, France), Heudiasyc (Compiègne, France) and LIPN (Paris, France)

Academic research without specific fundings

• Approximation of separable non-convex optimization programs
• Participants : Claudio Contardo (CIRRELT, Canada) and Sandra U. Ngueveu


• Pollution routing problem
• Participants : Daniele Manerba, Renata Mansini, Roberto Zanotti (University of Brescia, Italy) and Sandra U. Ngueveu


• Aircraft trajectories optimization with meteorological constraints
• Participants : Alexandre Gondran (ENAC), Sonia Cafieri (ENAC) and Sandra U. Ngueveu

Completed

• Project management with crashable and distributed tasks
• Participants : Cyril Briand (LAAS), Premsyl Šůcha (Technical University of Prague, Czech Republic), Alessandro Agnetis (Università degli Studi di Siena, Italy) and Sandra U. Ngueveu


• Vehicle Routing Problems with Intermediate/Transshipment Facilities
• Participants : Roberto Baldacci (University of Bologna, Italy), Roberto Wolfler Calvo (LIPN) and Sandra U. Ngueveu


• Flow-based formulation and valid inequalities for the mono-vehicle Cumulative CVRP / Traveling repairman problem
• Participants : Mathieu LACROIX (LIPN-Paris) and Sandra U. Ngueveu