Talks
We regularly report about our research results and practice projects at national and international conferences and workshops.
340
Talks
Talks
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