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{\bf DEPARTMENT OF MATHEMATICS AND COMPUTER SCIENCE} \\
{\bf UNIVERSITY OF SOUTHERN DENMARK, ODENSE}
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{\huge COMPUTER SCIENCE AND INDUSTRIAL APPLICATIONS COLLOQUIUM}
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{\large\bf Optimization at DSB S-tog A/S: Solution approaches and open problems}
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{\large\bf Julie Jespersen and Morten Nyhave Nielsen} \\
{\large\bf DSB-S-TOG A/S}\\

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{\large\bf Wednesday, November 17, 2004, at 14:15 to 16.00} \\
{\large\bf U2}
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\noindent{\bf Abstract:}
First an introduction to DSB S-tog is given, the dimensions etc.

Decision-support tool for strategic and tactic questions of rolling stock
and timetables

Abstract I
We discuss recent advances in a linear model to calculate timetables used
in DSB

S-tog:
A significant speedup (more than a factor 1000) and increased flexibility
of the model giving a larger solution space. The model is a Mixed Integer
Program (MIP) written in GAMS / CPLEX.

Abstract II
In this presentation we describe a decision-suppoprt tool mainly used for
important strategic decisions. A general model is constructed that allows
an easy reformulation of the objective for the model. The model is linear
with an insignificant runtime. The model was initiated because of the need
to answer various questions. For example questions of which fundamental
strategy to use when building timetables or how to match a production order
of different train lengths to the needs defined by expected passenger demands.
The solutions of the model has worked as support for fundamentally important
questions.

In the end of the session we mention some interesting problems to be solved
in DSB S-tog in the near future. These are intended for students who want to
do a Master Thesis with application of real world data.

Please note that the colloquium is in lecture room U2 and lasts two times 45 minutes.

Host: Jørgen Bang Jensen 
   
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