MOGISA Group

November 2011 Modeling, Optimization, and Integrated Management of Systems of Activities Toulouse, France MOGISA 1

LAAS-CNRS

  LAAS = Laboratory for Analysis and Architecture of Systems Founded in 1967  Laboratory of the French National Center for Scientific Research (CNRS)  More than 650 persons:   Research scientists Faculty members (  (  100) 100)  Graduate, PhD students, and postdocs (  300)  Engineers, technicians, and administrative clerks (  100)  Associated to:  Université Paul Sabatier (UPS)  Institut National Polytechnique (INP)   Institut National des Sciences Appliquées (INSA) Institut Supérieur de l’Aéronautique et de l’Espace (ISAE)  4 thematic research areas:   Micro and Nano Systems (

MINAS

) Modelling, Optimisation and Control of Systems (

MOCOSY

)   Robotics and Artificial Intelligence (

RIA

) Critical Computer Systems (

SINC

) November 2011 MOGISA 2

Decision and Optimization theme

     Discrete and continuous optimization Constraint satisfaction Performance evaluation Robust, non-linear, saturated control Model-based diagnosis  3 research teams:    DISCO (diagnosis, supervision) MAC (control) MOGISA (discrete optimization, discrete-event dynamic systems) November 2011 MOGISA 3

November 2011

MOGISA: Members

(February 15, 2012)

11 research scientists – 8 PhD students – 1 post-docs

 Head: ARTIGUES Christian (DR)  Research scientists  BRIAND Cyril (Pr)  ESQUIROL Patrick (Mcf)  HEBRARD Emmanuel (CR)   HOUSSIN Laurent (Mcf) HUGUET Marie José (Mcf)  JOZEFOWIEZ Nicolas (Mcf)  LOPEZ Pierre (DR)  MERCE Colette (Pr)  MONCEL Julien (Mcf)  NGUEVEU Sandra (Mcf)  PhD Students (year of defence)         CHABAANE Nadia (2015) BEN RAHHOU Touria (2013) GAOUA Yacine (2014) MALTA Leonardo (2015) SARPONG Boadu (2013) SIALA Mohamed (2014) TANGPATTANAKUL Panwadee (2013) TROJET Mariem (2013)  Secretary  MOUCLIER Christèle  Post-doc SIMONIN Gilles MOGISA 4

Scientific objectives

   Research domains    Operations Research Artificial Intelligence (Constraints) Control Theory (Discrete-Event Systems) Research topics  Discrete optimization & Constraint satisfaction    Supply chain management Scheduling Transportation General stakes   Advances (models, algorithms, general methods) for fundamental problems Tackling complex constraints and multiple objectives for real-world applications  Coping with uncertainty and dynamics November 2011 MOGISA 5

Discrete Optimization and Constraint Satisfaction

 Objectives  General methods for solving: 

NP-hard

discrete optimization problems min f(x) x  X 

NP-complete

satisfaction problems  x, D(x)  C  Results  Tree search enhanced with learning mechanisms    Tree-based local search: discrepancy search improvements Large neighborhood search embedding implicit enumeration Constraint propagation-based cutting planes for integer programming November 2011  Applications to industrial problems  Frequency assignment in telecommunications  Production scheduling, project management, supply chain management, passenger transportation… MOGISA 6

Discrete Optimization and Constraint Satisfaction: trends



Robust discrete optimization

 Problems computationally challenging and currently intractable even for small instance problems   New constraint & integer programming approaches Application for robust scheduling (facing to limits of interval representation for uncertainty of data) 

Multi-objective optimization

 Exact methods   MIP as search components

Matheuristics

(

e.g.

, local branching) 

Constraint propagation and satisfaction

 Methods hybridization, integration and cross-fertilization for discrete optimization pbs  From CP, SAT, MIP, Metaheuristics, Mach. Learning, Parameterized Complexity November 2011 MOGISA 7

Scheduling

 Objectives  Integrating complex constraints from real-world applications and tackling uncertainty  Results      Complexity results on open problems Branch-and-bound methods for complex shop problems New MIP formulations (OMSP, RCPSP) Generalized resource constraint propagation New approach to generate flexible solutions for robust scheduling November 2011  Applications to industrial problems   wafer manufacturing crew scheduling MOGISA 8

Scheduling: trends



New challenges

 Parallel processors    Resource flexibility in production systems Power management systems Energy 7.0

7.1

6.0

6.1

3.0

6.2

3.1

ALU 4.0

2.0

4.1

2.1

4.2

2.2

4.3

1.0

5.0

1.1

5.1

1.2

5.2

1.3

5.3

1.4

1.0

1.1

1.2

MEM CTL 1.3

7.0

7.0

1.4

7.1

7.1

ODD 2.0

3 2.1

5 2.2

7 0 1 2 4 6 8 2.3

9 6.3

2.3

5.4



New efficient (exact and approximate) methods

for November 2011      cyclic scheduling problems under resource constraints scheduling under alternatives multi-objective scheduling mathematical models and constraint propagation approaches for energy constraints & objectives

(max,+) algebra

for solving and for performance evaluation of schedules MOGISA 3 9

Robust scheduling

  November 2011

Cooperation vs. Robustness (ROBOCOOP)

   Tasks are distributed among a set of agent Agent schedules are robust Distributed and reactive scheduling:    

Negotiation

between Agents Convergence of negotiations in finite time Trade-off between global and local objectives Cooperation mechanisms

Robust scheduling for innovative projects

 Problem     Activity failure implies project failure Past project investments are definitively lost  Alternative activities exist (flexibility): if an activity fails, but one alternative activity succeeds, project can go on Decision variables  Determine which activities have to be launched and their start time Objectives   Investments minimization Risk of project failure minimization (robustness) MOGISA 10

Land transportation

  Objectives  Solving complex Vehicle Routing / Passenger Transportation Problems Results: New models and methods for  Generalized TSPs     Multi-objective VRPs   VRP with route balancing Bi-objective TSPs with accessibility VRPs on multi-graphs Unusual objectives: stability Large Arc Routing Problems   Applications Waste collecting  Railway tracks examination November 2011 MOGISA 11

Land transportation: trends

 Goal   Convergence toward more realistic problems Optimization of individual/public transports  Challenges  Multi-modality in passenger transportation and VRPs     Advance the use of multi-objective optimization Problems with many constraints (“rich”) Dynamicity Take into account the human side of problems  Applications    Door-to-door service network (ANR + DHL) High-capacity and real-time on-demand transportation Multi-modal algorithms for GIS November 2011 MOGISA 12

Optimization in space

 ROSETTA/MOST (Post-doc – CNES Contract)  Scheduling of scientific experiences  Data transfer management system  Limited energy November 2011 MOGISA 13

Optimization in space

 Image-taking Scheduling of Earth observation satellites (PhD thesis THEOS Operational Training Program + Project CNES + Astrium/ONERA on flexible scheduling) November 2011 MOGISA 14

Optimization in space

 Frequency allocation for satellite communications (Collaboration with Thales AS) November 2011 MOGISA 15

Contracts & collaborations

  Industrial contracts : EADS, Airbus, Thales, Astrium, CNES, SNCF, Amadeus Academic projects November 2011  Local and National collaborations   IMT , LARA/ENAC, CLLE/LTC IBM/ILOG, INRIA Lille-Nord Europe, LAMSADE, LAGIS/ECL, LAPS Bordeaux, LI Avignon, LI Tours, LIMOS, LISA Angers, LOSI Troyes, LIP6,…  International collaborations : Spain, Canada, Belgium, Germany, Tunisia, Algeria … MOGISA 16

November 2011

Other visibility

 Involvement in life of ROADEF http://www.roadef.org/ http://www2.lifl.fr/PM2O/ (French OR&DA society) http://challenge.roadef.org/ http://roadef2010.fr/    Reporting (CRSNG Canada, ECOS-Sud/Nord, FWO Belgium, ANR, ANRT, “Régions”…)   Program committees of conferences (IESM, ILS, MISTA, MOSIM, ROADEF, JFPDA, CIGI) Conference organization : ROADEF 2010, JFPC 2012, Odysseus 2015 MOGISA 17

Publications 01/2005-12/2010

    40 journals with review board 2 books (editor) 80 refereed conferences with proceedings 11 book chapters November 2011   15 PhD thesis 2 “ HDR ” MOGISA 18

What do we wish to develop ?

November 2011 

Multiobjective optimization

 New methods  Parallelization to overcome computational complexity  Applications 

Optimization under uncertainties

 Robust optimization  Stochastic programming 

Collaborative logistics

 Intermodal transportation  Integrated systems MOGISA 19

MOGISA Group

November 2011 Modeling, Optimization, and Integrated Management of Systems of Activities November, 2011 MOGISA 20