Talks
We regularly report about our research results and practice projects at national and international conferences and workshops.
345
Talks
Talks
2025
SBB OR Symposium,
Bern,
Germany,
Sep 11, 2025.
title:
Arc-based Dynamic Discretization Discovery for Service Network Design
OR2025,
Bielefeld,
Germany,
Sep 4, 2025.
title:
Arc-based Dynamic Discretization Discovery for Service Network Design
Gerhard Woeginger Research Colloquium,
Aachen,
Germany,
July 3, 2025.
title:
Arc-based Dynamic Discretization Discovery for Service Network Design
2024
OR2024,
München,
Germany,
Sep 9, 2024.
title:
Branch-Price-and-Cut for a Hub Network Design Problem with Line Hauls
2023
seminar:
A Nested Decomposition Approach for the Multi-Stop Station Location Problem
seminar:
Branch-and-Price for a Service Network Design and Hub Location Problem
seminar:
An Algorithmic Approach for the Generation of N-1- Secure Power System Test Cases
seminar:
InnOpTEM: Integrated Optimization of Topological and Re-Dispatch Measures in Power Systems
seminar:
InnOpTEM Innovative approaches for optimizing topological remedial actions in grid congestion management
title:
Kantorovich, Koopmans (oder doch Dantzig?): Besser geht es nicht!
2022
seminar:
Machine learning-supported decomposition algorithms for a large scale hub location problem
title:
A hub location problem with service network design considerations
title:
An integrated facility location and service network design problem
title:
(Strong) branching in branch-and-price
title:
Facilitating Branch-and-Price Development and Experiments
Seminar Demokratie und Wissenschaft · Konrad-Adenauer-Stiftung,
Aachen,
Germany,
Apr 23, 2022.
keynote:
Optimale Aufteilung von Wahlkreisen
Women in OR & Analytics Event (online),
Jan 19, 2022.
keynote:
Science Communication for Operational Research
2021
Gurobi Industry Days,
Köln (online),
Germany,
Nov 9, 2021.
keynote:
Power Grid Optimization
RWTH WiWi Network · Research Talk,
Aachen (online),
Germany,
Sep 22, 2021.
invite:
Die Qual der Wahl: wieso wir in Entscheidungssituationen mehr Fantasie brauchen
Annual conference of the German Operations Research Society,
Bern (online),
Switzerland,
Sep 3, 2021.
title:
An Image-based Approach to Detecting Structural Similarity Among Mixed Integer Programs
title:
Exact Approaches for the Multi-Stop Station Location Problem
2020
keynote:
Political Districting in Germany
title:
Column Generation, Dantzig-Wolfe, Branch-Price-and-Cut
Projekt Leonardo, RWTH,
Aachen (online),
Germany,
Jul 2, 2020.
invite:
Optimierung oder Evolution?
title:
Persistency of Linear Programming Relaxations for the Stable Set Problem
2019
seminar:
(Automatic) Branch-Price-and-Cut
keynote:
Was ist, was kann mathematische Optimierung?
invite:
Airplane Boarding: Complexity, Approximation and Exact Solution
seminar:
Diskrete Optimierung: Wer die Wahl hat, hat die Qual
NGB/LNMB Seminar "Back to school, learn about the latest developments in Operations Research",
Lunteren,
Netherlands,
January 16, 2019.
plenary:
(How) does Machine Learning impact Operations Research?
invite:
Compact quadratizations for pseudo-Boolean functions
invite:
Computing Implicit Equations and the Tight-Cut Decomposition of a Hypergraph
invite:
A Polyhedral Characterization of Odd Pairs
invite:
Extended Formulations for Radial Cones of Odd-Cut Polyhedra
2018
FORA Symposium,
Aachen,
Germany,
December 18, 2018.
title:
Machine Learning meets Operations Research
SPOC18 "Machine Learning, Networks and Combinatorial Optimization",
Paris,
France,
December 14, 2018.
seminar:
Learning when to decompose
invite:
Extended Formulations for Radial Cones
invite:
ML + AI + Opt = ?
invite:
Lehrveranstaltungsplanung an der RWTH Aachen: Das carpe diem! Projekt
title:
Generic Branch-Price-and-Cut: GCG 3.0
title:
Computational Experiments with Nested DantzigWolfe Decompositions
title:
Decision Support for Political Districting
title:
Learning how to decompose
title:
Generic Branch-Price-and-Cut: GCG 3.0
invite:
Spark-MIP: Mixed-Integer Programming for the (Vector) Matroid Girth Problem
title:
Computational Experiments with Nested Dantzig-Wolfe Decompositions
invite:
Generic Branch-Price-and-Cut: GCG 3.0
invite:
Anything you can do, I can do better
INFORMS Conference on Business Analytics & Operations Research,
Baltimore,
United States,
April 16, 2018.
title:
Prescriptive Analytics for Political Districting
invite:
Eliminating redundant columns from column generation subproblems using classical Benders' cuts
invite:
Modular Detection of Model Structure in Integer Programming
invite:
Solving Bulk-Robust Assignment Problems to Optimality
invite:
Learning when to use a decomposition
invite:
Solving Bulk-Robust Assignment Problems to Optimality
2017
seminar:
Recent advances in the branch-price-and-cut solver GCG
title:
Resource constrained shortest path algorithm for EDF short-term thermal production planning problem
invite:
Mathematics optimally supports Political Districting
title:
Parity Polytopes and Binarization
invite:
Learning how to decompose
title:
Detecting, Interpreting and Exploiting Structures in Integrated Public Transport Planning Problems
semiplenary:
Optimization meets Machine Learning
invite:
Solving Bulk-Robust Assignment Problems to Optimality
invite:
Solving Bulk-Robust Assignment Problems to Optimality
invite:
Learning how to decompose
SPARS (Signal Processing with Adaptive Sparse Structured Representations),
Lisbon,
Portugal,
June 5-8, 2017.
title:
Computing the Spark of a Matrix
title:
Detecting Structures in Network Models of Integrated Traffic Planning
IMA and OR Society Conference on Mathematics of Operational Research,
Aston University, Birmingham,
United Kingdom,
April 20, 2017.
title:
Learning how to decompose
invite:
Resource constrained shortest path algorithm for EDF short-term thermal production planning problem
invite:
Complete Description of Matching Polytopes with One Linearized Quadratic Term for Bipartite Graphs
invite:
Complete Description of Matching Polytopes with One Linearized Quadratic Term for Bipartite Graphs
invite:
On the Strength of Dantzig-Wolfe Reformulations
invite:
Industrie 5.0: Kommt die mathematische Revolution?
plenary:
Branch-and-Price
invite:
Sparse Signal Reconstruction with Integrality Constraints
2016
DWCAA (4th Dolomites Workshop on Constructive Approximation and Applications),
Alba di Canazei,
Italy,
September 8-13, 2016.
invite:
Exploiting hidden sparsity for image reconstruction from nonlinear measurements
plenary:
GCG: A Generic Branch-Price-and-Cut Solver
invite:
Local Search Based Approximation Algorithms for Two-Stage Stochastic Location Problems
11th International Conference on the Practice and Theory of Automated Timetabling,
Udine,
Italy,
August 23-26, 2016.
plenary:
University Course Timetabling: from three-, to two-, to one-indexed formulations: what's next?
20th Workshop on Future Research in Combinatorial Optimization (FRICO),
Osnabrück,
Germany,
August 2-5, 2016.
invite:
Solving large-scale network flow problems by vertex aggregation
invite:
Investigating Polyhedra by Oracles
invite:
Investigating Polyhedra by Oracles
invite:
A Constant-Factor Local Search Approximation for Two-Stage Facility Location Problems
Poster presentation at 18th Conference on Integer Programming and Combinatorial Optimization (IPCO XVIII),,
Liege,
Belgium,
June, 2016.
invite:
Investigating Polyhedra by Oracles
invite:
Mathematik Inside - Was bedeutet eigentlich Industrie 4.0?
invite:
Dantzig-Wolfe Reformulations for the Stable Set Problem and Possible Extensions to Related Problems
invite:
New Applications of Sparsity-Based Learning
2015
invite:
Optimierte Einteilung der Wahlkreise für die Deutsche Bundestagswahl
Hans-Hermann-Voss Stiftung, Exploratory Research Space, RWTH Aachen University,
Aachen,
Germany,
November 17, 2015.
invite:
Deterministic Optimization of Industrial Energy Systems
title:
Optimization goes data science goes optimization
invite:
Decentralized Energy Supply Systems: An Adaptive Discretization Approach
title:
Search Strategies for MIP Diving Heuristics
invite:
A Constant-Factor Local Search Approximation for Two-Stage Facility Location Problems
invite:
Optimal Rescheduling in Automotive Industry
19th Workshop on Future Research in Combinatorial Optimization,
Cologne,
Germany,
August 11 -- 14, 2015.
invite:
A Local Search Approximation for the Two-Stage Stochastic Facility Location Problem
22nd International Symposium on Mathematical Programming (ISMP),
Pittsburgh,
United States,
July 12-17, 2015.
invite:
Adaptive Discretization of Nonlinear Optimization Models for Energy Supply Systems
ISMP (22nd International Symposium on Mathematical Programming),
Pittsburgh, PA,
United States,
July 12-19, 2015.
invite:
Branch & Cut Methods for Exact Sparse Recovery
invite:
Branching and Cutting Planes in Branch-and-Price
invite:
Detecting Structure in Mathematical Programs
Symposium des Förderverein des Operations Research an der RWTH Aachen e.V.,
Aachen,
Germany,
May 7, 2015.
invite:
Optimierte Einteilung der Wahlkreise für die Deutsche Bundestagswahl
GAMM (86th Annual Meeting of the Internat. Assoc. of Applied Math. and Mechanics),
Lecce,
Italy,
March 23-27, 2015.
invite:
Computational Aspects of Sparse Recovery
Workshop "Sparse Tomographic Reconstruction: Theoretical and Numerical Aspects",
Heidelberg,
Germany,
March 19-20, 2015.
invite:
Computational Aspects of Sparse Recovery
Workshop on Mixed-Integer Nonlinear Optimization Methods for Energy Systems Engineering,
Aachen,
Germany,
March 9-10, 2015.
invite:
Adaptive Discretization of Nonlinear Optimization Models for Energy Supply Systems
2014
seminar:
GCG: a generic branch-price-and-cut solver
invite:
Political Districting for Elections to the German Bundestag
title:
Primal Heuristics for Multi-Stage Mixed Integer Programs
seminar:
Structure in Integer Programming Models
invite:
Column Generation (1.5 days of lectures)
invite:
Column Generation (practical session for one day)
invite:
Computational Study of Graphic TSP Approximation Algorithms
2013
International Conference on Operations Research,
Rotterdam,
Netherlands,
September 3–6, 2013.
title:
Heuristic Approaches for Staircase-Structured Mixed Integer Programs
title:
Heuristic Approaches for Staircase-Structured Mixed Integer Programs
SPARS (Signal Processing with Adaptive Sparse Structured Representations),
Lausanne,
Switzerland,
July 8-11, 2013.
title:
The Computational Complexity of Spark, RIP, and NSP
title:
A Contraction-Expansion Algorithm for the Capacitated Minimum Cost Flow Problem
TRISTAN VIII: Triennial Symposium on Transporation Analysis,
San Pedro de Atacama,
Chile,
June 9-14, 2013.
title:
GCG: A Generic Branch-Price-and-Cut Solver
Danish Operations Research Society: Applications of Optimization - Best Practice and Challenges,
Copenhagen,
Denmark,
May 29, 2013.
invite:
Optimizing the 2013/2014 RWTH Aachen University Timetable
seminar:
Column Generation and Branch-and-Price
Edinburgh Research Group in Optimization,
University of Edinburgh,
United Kingdom,
February 13, 2013.
seminar:
GCG: a generic branch-price-and-cut solver
SICS konferens om industriell effektivitet,
The Swedish Intitute of Computer Science, Stockholm,
Sweden,
February 11, 2013.
invite:
Industrial optimization - Lessons learned from optimization in practice
2012
MATHEON-Workshop "Sparse Representation of Functions: Analytic and Computational Aspects",
Berlin,
Germany,
December 10-14, 2012.
invite:
Branch & Cut for L0-Minimization
seminar:
Column generation and branch-and-price: why and how?
3. Brazilian-German Frontiers of Science and Technology Symposium (BRAGFOST),
Brasilia,
Brazil,
November 8-11, 2012.
invite:
Solving huge integer programs to optimality
plenary:
Column generation
title:
Primal Heuristics for the Branch-and-Price Solver GCG
title:
Large Neighborhood Search and Diving Heuristics in Column Generation Algorithms
title:
A generic branch-price-and-cut solver
12th Conference of the IFIP Working Group 7.6 on Advanced Analytics,
Aachen,
Germany,
August 29-31, 2012.
title:
Solving integer programs by branch-and-price (automatically, since three weeks)
ISMP (21st International Symposium on Mathematical Programming),
Berlin,
Germany,
August 19-24, 2012.
invite:
Heuristic Optimality Check and Computational Solver Comparison for Basis Pursuit
title:
Large Neighborhood Search and Diving Heuristics in Column Generation Algorithms
International Symposium on Mathematical Programming (ISMP) 2012,
Berlin,
Germany,
August 19-24, 2012.
title:
A generic branch-price-and-cut solver
title:
Exploiting Problem Structures Heuristically within Column Generation Algorithms
SIAM Conference on Applied Linear Algebra,
Valencia,
Spain,
June 18-22, 2012.
invite:
Solving Basis Pursuit
invite:
Column generation for the cut packing problem
invite:
Generic branch-price-and-cut: a status report
title:
Large Neighborhood Search in Column Generation Algorithms
11th International Symposium on Experimental Algorithms (SEA 2012),
Bordeaux,
France,
June 7-9, 2012.
plenary:
Automatic Decomposition and Branch-and-Price: A Status Report
2011
Mathematisches Kolloquium,
Fachgruppe Mathematik, RWTH,
Germany,
November 29, 2011.
seminar:
Strukturen in ganzzahligen Programmen
International Conference on Operations Research,
Zurich,
Switzerland,
August 30-September 2, 2011.
title:
Improved column generation for highly degenerate master problems
International Conference on Operations Research,
Zürich,
Switzerland,
August 30 – September 2, 2011.
title:
Primal Heuristics for Branch-and-Price Algorithms
Mixed Integer Programming Workshop MIP2011,
U Waterloo,
Canada,
June 20-23, 2011.
invite:
Towards automatic Dantzig-Wolfe decomposition
Kolloquium "Optimierung und Operations Research",
TU Dortmund,
Germany,
May 9, 2011.
seminar:
Automatic decomposition of integer programs?
INFORMS conference on business analytics and operations research,
Chicago,
United States,
April 10-12, 2011.
title:
Operations research enlarges the world's busiest artificial waterway
Symposium of the GOR working group "real world optimization",
Bad Honnef,
Germany,
April 7-8, 2011.
invite:
Would the world be different without branch-and-price?
Københavns Universitet, DIKU,
København,
Denmark,
March 28, 2011.
seminar:
Dantzig-Wolfe reformulations of general MIPs
Operations Research Seminar,
Maastricht University, Department of Quantitative Economics,
Belgium,
February 22, 2011.
seminar:
Tiny steps towards automated Dantzig-Wolfe reformulation
15th Combinatorial Optimization Workshop,
Aussois,
France,
January 10-14, 2011.
invite:
Partial convexification of general MIPs
2010
Operations Research (OR),
Munich,
Germany,
September 1-3, 2010.
title:
Nested Column Generation for a Ship Routing and Scheduling Problem with Split Pickup and Split Delivery
CSSIP (Workshop on Compressed Sensing, Sparsity and Inverse Problems),
Baunschweig,
Germany,
September 6-7, 2010.
title:
An Infeasible-Point Subgradient Method and Computational Comparison for l¹-Minimization
Seventh Triennial Symposium on Transportation Analysis (TRISTAN 7),
Tromsø,
Norway,
June 20-25, 2010.
title:
Nested Column Generation for a Ship Routing and Scheduling Problem with Split Pickup and Split Delivery
MathInside - Mathematik ist überall,
Urania, Berlin,
Germany,
March 23, 2010.
seminar:
Wir haben den Kanal voll - Diskrete Optimierung hilft dem Schiffsverkehr im Nord-Ostsee-Kanal
DMV Jahrestagung,
Munich,
Germany,
March 8-12, 2010.
title:
Integer programs for university course timetabling
2009
Symposium of the GOR working group "real world optimization",
Bad Honnef,
Germany,
November 19-20, 2009.
invite:
Branch-and-price (in public transportation problems)
20th International Symposium on Mathematical Programming,
Chicago,
United States,
August 23-28, 2009.
title:
Ship Traffic Optimization for the World's Busiest Artificial Waterway
European Conference on Operational Research, EURO XXIII,
Bonn,
Germany,
July 5-8, 2009.
invite:
Sequencing and Scheduling in Coil Coating with Shuttles
DFG SPP Workshop Algorithm Engineering for Integer Programming,
Kiel,
Germany,
May 7-8, 2009.
title:
Generische Dekompositionsalgorithmen für ganzzahlige Programme
13th Combinatorial Optimization Workshop,
Aussois,
France,
January 11-17, 2009.
invite:
Sorting with complete networks of stacks
2008
Operations Research (OR),
Augsburg,
Germany,
September 2-5, 2008.
title:
Optimal University Course Timetabling
Oberseminar Effizienz dezentraler Strukturen, Lehrstuhl für Wirtschaftsmathematik, Universität Bayreuth,
Bayreuth,
Germany,
July 7, 2008.
seminar:
Ein ganzzahliges Programm für das University Course Timetabling Problem
Workshop on Experimental Algorithms (WEA),
Provincetown, MA,
United States,
May 30 - June 1, 2008.
title:
Optimal university course timetables and the partial transversal polytope
Vortragsreihe Operations Research,
Universität Karlsruhe (TH),
Germany,
May 16, 2008.
invite:
Schwierige ganzzahlige Programme aus Produktion und Logistik
Mathematisches Kolloquium, Technische Universität Dortmund,
Dortmund,
Germany,
May 6, 2008.
invite:
Ganzzahlige Programme in diskreter Optimierung und industriellen Anwendungen
Mathematisches Kolloquium, Technische Universität Clausthal,
Clausthal,
Germany,
February 22, 2008.
invite:
Ganzzahlige Programme in diskreter Optimierung und industriellen Anwendungen
2007
Operations Research 2007,
Saarbrücken,
Germany,
September 4-7, 2007.
title:
Conflict-free Vehicle Routing
Festkolloquium 60th anniversary of Uwe Zimmermann,
TU Braunschweig,
Germany,
April 27, 2007.
title:
Rangieren und Stapeln: Praktische Lösungen für schwere Probleme
Colloquium of the Research Training Group "Methods for Discrete Structures",
FU Berlin,
Germany,
January 29, 2007.
seminar:
Computational Mixed Integer Programming
Kolloquium "Optimierung und Operations Research",
Universität Dortmund,
Germany,
January 25, 2007.
invite:
Intelligentes Stapeln: Transportoptimierung in einem Brammenlager
11th Combinatorial Optimization Workshop,
Aussois,
France,
January 7-12, 2007.
invite:
Optimizing the Cargo Express Service of Swiss Federal Railways
2006
ARRIVAL/Matheon Fall School 2006 on Timetabling and Line Planning,
Dabendorf near Berlin,
Germany,
September 26-29, 2006.
invite:
IP Techniques for Large Networks: Column Generation
GERAD Summer school on column generation,
Montréal,
Canada,
May 15-19, 2006.
invite:
Column Generation: Basic Theory (6 hour lecture)
Seminar, Centre for Traffic and Transport, Technical University of Denmark,
Copenhagen,
Denmark,
March 24, 2006.
invite:
Towards Industrial Railroad Optimization: Switching, Routing, and Scheduling
10th Combinatorial Optimization Workshop,
Aussois,
France,
January 8-13, 2006.
invite:
2005
Combinatorial Optimization,
Oberwolfach,
Germany,
November 6-12, 2005.
invite:
Towards Industrial Railroad Optimization: Switching, Routing, and Scheduling
9th Combinatorial Optimization Workshop,
Aussois,
France,
March 13-19, 2005.
invite:
Algorithms for Optimization with Incomplete Information,
Dagstuhl,
Germany,
January 16-21, 2005.
invite:
2004
Oberseminar über Diskrete Optimierung, Universität Dortmund,
Dortmund,
Germany,
November 18, 2004.
seminar:
Rectangle covers revisited computationally
Kolloquium "Optimierung und Operations Research",
Universität Dortmund,
Germany,
November 17, 2004.
seminar:
Einschränken der Ladebedingungen beim Pickup and Delivery Problem: Gut für Theorie und Praxis
Operations Research 2004,
Tilburg,
Netherlands,
September 1-3, 2004.
title:
Compressing wavelet-transformed images via rectangle covers
Colloquium within the European Graduate Program "Combinatorics, Geometry and Computation",
FU Berlin,
Germany,
April 19, 2004.
seminar:
Covering polygons by rectangles
SIGOPT, International Conference on Optimization,
Wittenberg,
Germany,
February 15-18, 2004.
title:
Rectangle covers revisited computationally
15th ACM-SIAM Symposium on Discrete Algorithms (SODA04),
New Orleans, LA,
United States,
January 11-13, 2004.
title:
Minimizing the stabbing number of matchings, trees, and triangulations
8th Combinatorial Optimization Workshop,
Aussois,
France,
January 4-9, 2004.
invite:
Rectangle covers revisited computationally
2003
GOR Workshop "Optimierung im Öffentlichen Nahverkehr",
ZIB, Berlin,
Germany,
November 13-14, 2003.
invite:
Optimales Rangieren
18th International Symposium on Mathematical Programming,
Copenhagen,
Denmark,
August 18-22, 2003.
title:
On the stabbing number of matchings, trees, and triangulations
BMBF-Workshop Verkehr, Transport, Logistik, Energiewirtschaft,
Lahmeyer International, Bad Vilbel,
Germany,
June 26-27, 2003.
title:
Optimales Wagenmanagement bei Werks- und Industriebahnen
ROUTE 2003, International Workshop on Vehicle Routing,
Skodsborg,
Denmark,
June 22-25, 2003.
invite:
On Compact Formulations for Integer Programs Solved by Column Generation
7th Combinatorial Optimization Workshop,
Aussois,
France,
March 9-15, 2003.
invite:
On the stabbing number of matchings, trees, and triangulations
2002
Combinatorial Optimization,
Oberwolfach,
Germany,
November 24-30, 2002.
invite:
Minimum Turn Cycle Covers in Grid Graphs
3rd Research Seminar on Railway Optimization Problems,
Oegstgeest,
Netherlands,
October 1-4, 2002.
title:
Rail Car Allocation Problems
OR 2002, International Conference on Operations Research,
Klagenfurt,
Austria,
September 2-5, 2002.
title:
Minimum Turn Cycle Covers in Grid Graphs
Tag der Mathematik und Informatik,
Braunschweig,
Germany,
September 25, 2002.
title:
Workshop: Das Geheimnis des kürzesten Weges
OR2002, International Conference on Operations Research,
Klagenfurt,
Austria,
September 2-5, 2002.
title:
Optimal Rail Car Allocation
Algorithms Seminar, School of Computer Science, McGill University,
Montréal,
Canada,
June 3, 2002.
seminar:
Minimum Turn Cycle Covers in Grid Graphs
GERAD Seminar, Group for Research in Decision Analysis,
Montréal,
Canada,
May 31, 2002.
seminar:
Optimal Rail Car Allocation
Seminar, Department of Applied Mathematics and Statistics,
University at Stony Brook, NY,
United States,
May 20, 2002.
seminar:
Minimum Turn Cycle Covers in Grid Graphs
Combinatorial Optimization Seminar, Department of Combinatorics and Optimization, University of Waterloo,
Ontario,
Canada,
May 16, 2002.
seminar:
Minimum Turn Cycle Covers in Grid Graphs
Seminar, Department of Computing and Information Science, Queen's University,
Kingston, Ontario,
Canada,
May 14, 2002.
seminar:
Optimal Rail Car Allocation
BMBF-Workshop Verkehr, Transport, Logistik, Energiewirtschaft,
DB Systems, Frankfurt,
Germany,
February 28-March 1, 2002.
title:
Optimale Rangierauftragsbildung bei Industriebahnen
2001
Mathematical Methods in Manufacturing and Logistics,
Oberwolfach,
Germany,
December 16-21, 2001.
invite:
Optimal Rail Car Allocation Problems
Mathematisches Kolloquium,
Brandenburgische Technische Universität Cottbus,
Germany,
November 13, 2001.
seminar:
Einsatzplanung von Rangierlokomotiven mittels Spaltengenerierung
OR2001, Symposium on Operations Research,
Duisburg,
Germany,
September 3-5, 2001.
title:
Modeling the Freight Car Management at Industrial Plants
BMBF-Workshop Verkehr, Transport, Logistik / Energietechnik und -wirtschaft,
Technische Universität Berlin,
Germany,
April 5-6, 2001.
title:
Optimales Wagenmanagement bei Werks- und Industriebahnen
5th Combinatorial Optimization Workshop,
Aussois,
France,
March 5-9, 2001.
invite:
Combinatorial Restrictions on Pickup and Delivery Paths
2000
AMORE Research Seminar on Railway Optimization Problems,
Konstanz,
Germany,
October 16-20, 2000.
title:
Engine Scheduling and Column Generation
OR2000, International Conference on Operations Research,
Dresden,
Germany,
September 9-12, 2000.
title:
Scheduling the Rolling Stock of Private Railroads
ROUTE2000, International Workshop on Vehicle Routing,
Skodsborg,
Denmark,
August 16-19, 2000.
invite:
Pickup and Delivery Paths of Restricted Combinatorial Structure
ISMP2000, 17th International Symposium on Mathematical Programming,
Atlanta, GA,
United States,
August 7-11, 2000.
title:
Pickup and Delivery Paths of Restricted Combinatorial Structure
CASPT-2000, 8th International Conference "Computer-Aided Scheduling of Public Transport",
Berlin,
Germany,
June 21-23, 2000.
title:
Scheduling of Switching Engines in Practice
1999
Modellierung und Simulation von Verkehr, Arbeitskreis Mathematik in Forschung und Praxis,
Physikzentrum Bad Honnef,
Germany,
November 18-19, 1999.
invite:
Optimale Disposition von Rangierlokomotiven bei Werks- und Industriebahnen: Vom Bedarf zum Produkt
Mathematisches Kolloquium 1999, Forschungsseminar "Diskrete Mathematik und Optimierung",
Gerhard-Mercator-Universität Duisburg,
Germany,
November 17, 1999.
seminar:
Optimale Disposition von Rangierlokomotiven bei Werks- und Industriebahnen: Vom Bedarf zum Produkt
1. BMBF Workshop Diskrete Optimierung, Verkehr und Einsatzplanung,
Konrad-Zuse-Zentrum Berlin,
Germany,
November 9, 1998.
title:
Umlaufplanung im Güterverkehr bei Werks- und Industriebahnen
Traffic and Transport Optimization,
Oberwolfach,
Germany,
November 7-13, 1999.
invite:
Optimal Engine Scheduling at Industrial In-Plant Railroads
Bonn Workshop on Discrete Optimization,
Bonn,
Germany,
September 28-October 2, 1998.
invite:
Engine Scheduling at Industrial Freight Railroad Companies
Symposium on Operations Research 1999,
Magdeburg,
Germany,
September 1-3, 1999.
title:
Engine Scheduling in Absence of Time Tables
DO99, Workshop on Discrete Optimization,
Rutgers University, NJ,
United States,
July 25-30, 1999.
title:
On Combinatorially Restricted Pickup and Delivery Paths
MAPSP99, Fourth Workshop on Models and Algorithms for Planning and Scheduling Problems,
Renesse,
Netherlands,
June 14-18, 1999.
title:
A Column Generation Approach to Engine Scheduling
1998
International Conference on Operations Research 1998,
Zurich,
Switzerland,
August 31-September 3, 1998.
title:
Computational Study of an Engine Scheduling Problem at Industrial Freight Railroad Companies
Combinatorial and Global Optimization,
Chania, Crete,
Greece,
May 25-29, 1998.
title:
Mixed Integer Formulation of a Locomotive Scheduling Problem at Industrial Freight Railroads
1997
Symposium on Operations Research 1997,
Jena,
Germany,
September 3-5, 1997.
title:
The Vertex Set of a 0-1 Polytope is Strongly $P$-Enumerable
ISMP 97 - XVI. International Symposium on Mathematical Programming,
EPFL, Lausanne,
Switzerland,
August 24-29, 1997.
title:
The Vertex Set of a 0-1 Polytope is Strongly $P$-Enumerable