|
Fifth Joint Operations Research Days
August 27-28, 2007 |
Swiss Federal Institute of Technology Zurich (ETH Zurich) |
Room HG G19.1 |
Click here for directions to ETHZ. The main building is
marked RED in the map. Both rooms HG G19.1 and G60 (for the celebration
session) are on the "G" (second) floor of the main building. G19.1 is at
the north-east corner and G60 is at the central hall.
Organizing committee:
- Michel Bierlaire, EPFL
- Komei Fukuda, ETHZ and EPFL
- Jon Lee, IBM Research
- Thomas Liebling, EPFL
- Hans-Jakob Lüthi, ETHZ
- Eleni Pratsini, IBM Research
Click
here to register.
Schedule
The following schedule is tentative and may be modified. Make sure
you consult it again just before the conference
For contributed talks, click on the author's name to access the
abstract
Monday August
27 |
10:00-10:30 |
Coffee |
10:30-12:10 |
Contributed talks |
Room: HG G19.1 |
|
Chair: Eleni Pratsini |
|
10:30 |
Jon
Lee |
IBM T.J. Watson Research Center |
10:55 |
Karl
Frauendorfer |
Institute for Operations Research and Computational Finance,
University of St. Gallen |
11:20 |
Max
Fehr |
Institute for Operations Research (ETH Zuerich) |
11:45 |
Ilaria
Vacca |
Transport and Mobility Laboratory, EPFL |
12:10-13:30 |
Lunch |
|
13:30-17:15 |
Celebration
for the 40th Anniversary of IFOR |
Room:HG G60 |
|
Chair:Hans-Jakob Lüthi |
|
13:30 |
H.-J. Lüthi |
IFOR |
13:40 |
Brenda
Dietrich |
INFORMS President, and Director of Mathematical Sciences at IBM
T.J. Watson Research, USA |
14:10 |
Martine
Labbé |
EURO President, and Université libre de Bruxelles, Belgium |
15:00 |
Tatsuo
Oyama |
Vice President of the Operation Research Society of Japan, and
National Graduate Institute for Policy Studies |
15:30 |
Daniel Costa |
President of Swiss Operation Research Society, and Nestlé
Lausanne/Parma |
16:15 |
Shaping the future of OR in Switzerland |
17:30 |
Cocktail |
Dozentenfoyer, floor J |
18:30 |
Dinner |
Dozentenfoyer, floor J |
Tuesday August
28 |
9:30-10:20 |
Contributed talks |
Room:HG G19.1 |
|
Chair:Michel Bierlaire |
|
9:30 |
Ola
Svensson |
IDSIA |
9:55 |
Gautier
Stauffer |
IBM ZRL |
10:20-10:50 |
Coffee |
|
10:50-12:05 |
Contributed talks |
Room:HG G19.1 |
|
Chair:Jon Lee |
|
10:50 |
Niklaus
Eggenberg |
Transport and Mobility Laboratory, EPFL |
11:15 |
Stephan
Bütikofer |
Universität Zürich, IOR |
11:40 |
Vania
Dos Santos Eleuterio |
ETH Zurich |
12:05-13:10 |
Lunch |
|
13:10-14:25 |
Contributed talks |
Room:HG G19.1 |
|
Chair:Komei Fukuda |
|
13:10 |
Thomas
Robin |
Transport and Mobility Laboratory, EPFL |
13:35 |
Abderrahim
Labbi |
IBM Zürich Research Center |
14:00 |
Bernard
Ries |
ROSE, EPFL |
14:25-14:55 |
Coffee |
|
14:55-15:45 |
Contributed talks |
Room:HG G19.1 |
|
Chair:Thomas Liebling |
|
14:55 |
Rico
Zenklusen |
ETH Zurich |
15:20 |
Sivan
Altinakar |
ROSE, EPFL |
We have pre-booked some rooms in the following hotel. When you reserve,
mention code "IBM" to benefit from the conference rate.
- Hotel Sunnehus***
- Sonneggstr. 17
8006 Zürich Tel: +41 44 250 27 27 e-mail: info@hotelsunnehus.ch http://www.hotelsunnehus.ch/
Very close to the ETH main building (HG). ETH rate 154.50 incl.
breakfast. 10 single rooms reserved for the conference. Please mention
code "IBM" to reserve until July 27.
- Hotel St. Josef***
- Tel. +41 44 250 57 57
e-mail: info@st-josef.ch http://www.st-josef.ch/hotel/index_e.html
Close to the ETH main building (HG). ETH rate CHF 140.- incl.
breakfast (+ city tax). 9 rooms reserved for the conference. Please
mention code "IBM" to reserve until August 10.
We invite members of IBM research staff and Swiss OR researchers to
submit abstracts about their recent research. We strongly encourage PhD
students to present their results.
Abstract submission is closed
Number of abstracts: 14
- Altinakar Sivan (ROSE, EPFL):
A reduction of cyclic interval edge coloring to interval edge
coloring
- joint work with: Wieslaw Kubiak The $k$-interval edge
coloring problem consists of finding a coloring of the edges with colors
from 1 to $k$, such that for each node the colors of the edges adjacent
to it are all different and form an integer interval. This problem can
be extended to the $k$-cyclic interval edge coloring problem, where
colors $k$ and 1 are considered consecutive. Such problems have
applications in non-preemptive (cyclic) open shop scheduling. This work
aims at studying the relationship between these two problems, and
presents a reduction of the $k$-cyclic interval edge coloring problem
with $k-2\leq\delta\leq\Delta\leq k$ to the $k$-interval edge coloring
problem, where $\delta$ and $\Delta$ are respectively the minimum and
maximum degree in the graph, and $k$ is the number of colors used. The
reduction is obtained by adding specific subgraphs to the graph of the
original cyclic problem, and it guarantees that if the original graph is
bipartite, then the resulting graph is bipartite as well.
- Bütikofer Stephan
(Universität Zürich, IOR): Globalizing a nonsmooth Newton method via
path search
- We give a framework for the globalization of a nonsmooth Newton
method for solving Lipschitz equations introduced by B. Kummer. We start
with recalling Kummers approach to convergence analysis of this method
and state his results for local convergence [1]. In a second part we
give a globalized version of this method. In our approach we use first a
monotone path search idea to control the descent. After elaborating the
single steps, we analyze and discuss the proof of global convergence
resp. of local superlinear or quadratic convergence of the algorithm. We
sketch also a nonmonotone version of the algorithm. In the last part we
discuss and illustrate the details of the general algorithm (e.g the
computation of a path) for some interesting examples and present results
from numerical tests. Reference: [1] D. Klatte and B. Kummer, “Nonsmooth
Equations in Optimization”, Kluwer, (Dordrecht-Boston-London 2002).
- Dos Santos Eleuterio
Vania (ETH Zurich): Traffic Equilibrium Problem: a
comparison of the flow distribution in Beckmann and Nesterov & de
Palma models.
- We consider qualitative and quantitative differences between the
traffic equilibrium models of Beckmann (1956) and Nesterov & de
Palma (1998). We use large scale benchmark instances as well as real
data. For solving the traffic equilibrium model of Beckmann we use a
commercial package. For Nesterov & de Palma model, we design
algorithms based on smooth and non smooth methods from Nesterov
(2003/5). Since derived problems are multicommodity flow problems, the
algorithms’ numerical performance might be of independent interest. We
perform also sensitivity analysis of the solutions of both models. Joint
work with Fabian A. Chudak and Yurii Nesterov
- Eggenberg Niklaus (TRANSP-OR,
EPFL): Column generation methods for disrupted airline
schedules
- We consider the recovery of an airline schedule after an unforeseen
event, commonly called disruption, that makes the planned schedule
unfeasible. In particular we consider the aircraft recovery problem for
a heterogeneous fleet of aircrafts, made of regular and reserve planes,
where the maintenance constraints are explicitly taken into account and
different maintenance constraints can be imposed. The aim is to find the
optimal combination of routes within a given makespan for each plane in
order to recover to the initial schedule, given the initial schedule and
the disrupted state of the planes. We propose a column generation scheme
based on a multicommodity network flow model, where each commodity
represents a plane, a dynamic programming algorithm to build the
underlying networks and a dynamic programming algorithm to solve the
pricing problem. This project arises from a collaboration between EPFL
and APM Technologies, which is a small company selling IT solutions to
airlines. We provide some computational results on real world instances
obtained from a medium size airline, Thomas Cook Airlines, one of APM
main customers.
- Fehr Max (Institute for Operations
Research (ETH Zuerich)): Joint allowance and electricity price
formation in the European Emission Trading Scheme
- Cap and Trade Systems have not least since the ratification of the
Kyoto Protocol in 2004 become popular environmental instruments. However
recent price development of carbon allowances in the EU Emission Trading
Scheme and it’s impact on European electricity prices exhibits the
importance of a clear understanding of such Trading Systems. To this end
we propose a stochastic multi period equilibrium model for joint
allowance and electricity price formation in the European Emission
Trading Scheme. Thereby particular focus is given on the influence of
market design on windfall profits, allowance prices and overall social
costs. Moreover it is shown that small changes to Cap and Trade Schemes
can prohibit windfall profits.
- Frauendorfer Karl
(Institute for Operations Research and Computational Finance, University
of St. Gallen): Valuation and Bidding of Hydro Power Plants in the
EEX
- We start with considering american call and put options with a
limited number of exercise rights. We apply stochastic multistage
programming and investigate the impact of the filtration to the accuracy
with respect to volatility, strike and delivery period. The value of
early exercisement of the american put will be assessed. We extend the
application to the electrical power industry and apply the valuation
concept to generalized Pilipovic price dynamics. We report on the
valuation of swing options, the associated profit &loss
distributions and risk measurement. Further, we focus on an approach
that evaluates bidding strategies for the optimal dispatching of hydro
plants. The sensitivity of the results subject to different mean
reversion and volatility coefficients is revealed. The numerical results
have been achieved with a software package that has been developed in
cooperation with large European power producers and traders.
- Labbi Abderrahim (IBM Zurich):
Transform Regression: A New Predictive Modeling Algorithm Inspired
by the Kolmogorov Superposition Theorem
- This talk will present a new automated statistical modeling
algorithm that draws inspiration from the Kolmogorov superposition
theorem. The algorithm addresses the need to develop statistical models
of the relationships between decision variables and outcomes for
problems in which the mathematical forms of the relationships are
unknown. Examples of such problems often involve predictions of human
behavior, such as marketing mix modeling to optimize advertising spend
across media and geographies, and customer propensity modeling to
optimize return on targeted marketing investment across a customer base.
This talk will present an automated statistical modeling technique that
has been developed that is well-suited to these cases that is capable of
automatically modeling nonlinearities and cross-product interactions.
- Lee Jon (IBM T.J. Watson Research
Center): Nonlinear Matroid Optimization and Experimental Design
- We study the problem of optimizing nonlinear objective functions
over matroids presented by oracles or explicitly. Such functions can be
interpreted as the balancing of multi-criteria optimization. We provide
a combinatorial polynomial time algorithm for arbitrary oracle-presented
matroids, that makes repeated use of matroid intersection, and an
algebraic algorithm for vectorial matroids. Our work is partly motivated
by applications to minimum-aberration model-fitting in experimental
design in statistics, which we discuss and demonstrate in detail. Joint
work with: Yael Berstein, Hugo Maruri-Aguilar, Shmuel Onn, Eva
Riccomagno, Robert Weismantel and Henry Wynn.
- Ries Bernard (ROSE, EPFL):
Mixed Graph Coloring
- We consider a coloring problem in mixed graphs (i.e. graphs
containing edges and arcs): we want to associate a color (integer) to
each vertex such that any two vertices linked by an edge have different
colors and the tail of an arc has a color strictly less than the head of
this arc. We present bounds on the mixed chromatic number and we give
some complexity results which strengthen former results.
- Robin Thomas (EPFL): Modeling
Human Perception of Facial Expressions by Discrete Choice Models
- Facial expression recognition is a hard and ambiguous problem in
computer vision. It is hard due to the wide variety of faces and the
wide variety of ways of representing the same expression. And it is
ambiguous because, even though common approaches treat it as a
classification problem, actually when looking at the same scene,
different people can feel a different expression. In this presentation,
we will show preliminary results obtained in an ongoing project of
Discrete Choice Modeling of human perception of facial expressions. This
new approach allows to exploit the mentioned heterogeneity of
perceptions in a population of "experts" interpreting a facial
expression, where an expert is somebody able to discern between
different facial expressions, i.e. any human.
- Stauffer Gautier (IBM ZRL):
A new algorithm for the weighted stable set problem in claw-free
graphs
- The weighted stable set problem in claw-free graphs is as
generalization of the matching problem and can be solved in polynomial
time. The current algortithms (Sbihi 80, Minty 80, Nakamura Tamura 01,
Schrijver 03) are based on the augmenting path property inherited from
matching. Lovasz and Plummer 86 proposed another type of algorithm based
on graph reductions but unfortunately, this approach can only deal with
the unweighted case. In this talk, we give a new algorithm based on
graph reductions that allows to reduce the problem to a weighted
matching problem, thus generalizing the approach by Lovasz and Plummer.
- Svensson Ola (IDSIA):
(In)approximability Results for Precedence-Constrained Scheduling,
Sparsest Cut and Optimal Linear Arrangement
- We consider (uniform) sparsest cut, optimal linear arrangement and
the precedence constrained scheduling problem $1|prec|sum w_j C_j$.
Understanding the approximability of these notorious problems is
considered a major open problem in complexity/scheduling theory. By
combining techniques from vertex cover and dimension theory of partial
orders we obtain the best known approximation ratios for all considered
classes of precedence constraints for the scheduling problem. We also
briefly discuss the first inapproximability results for the addressed
problems obtained by using the recent Quasi-Random PCP construction by
Khot. References: Ambühl, C., Mastrolilli, M., Mutsanas, N., and
Svensson, O., Approximating Scheduling with Precedence Constraints of
Low Fractional Dimension. In proceedings of IPCO, volume LNCS 4168,
pages 28-39, Springer, 2007. Ambühl, C., Mastrolilli, M., and Svensson,
O., Inapproximability Results for Sparsest Cut, Optimal Linear
Arrangement, and Precedence Constraint Scheduling. To appear in
proceedings of FOCS, 2007.
- Vacca Ilaria (EPFL, Transp-OR):
Optimization of Container Terminal Operations
- Over the last years, international sea-freight container
transportation has grown dramatically and container terminals play
nowadays a key-role in the global shipping network. The increased
competitiveness among terminals requires more and more efficiency in
container operations, both along the quayside and within the yard, in
order to minimize ship’s turnaround time. Operations research methods
and techniques are therefore worth being used in optimizing terminal
operations. In this work, we first give an overview of decision problems
which arise in the management of a container terminal (e.g. berth
allocation, crane scheduling, storage policies and strategies, transfer
operations) and we briefly describe models and methods presented in the
literature. Then, starting from a collaboration with some of the busiest
ports in Europe, we have identified some critical issues which will be
illustrated: in particular, we focus on the impact that gate operations
and transshipment operations have on the yard and we propose a new
approach to the yard management which takes into account these
interactions. We conclude with suggestions of possible research tracks
and open issues.
- Zenklusen Rico (ETH Zurich):
Estimation of small s-t reliabilities in acyclic networks
- In the classical s-t network reliability problem a fixed network G
is given including two designated vertices s and t (called terminals).
The edges are subject to independent random failure, and the task is to
compute the probability that s and t are connected in the resulting
network, which is known to be #P-complete. In this talk, I will discuss
the issue of approximating the s-t reliability in case of a directed
acyclic original network G. A specialized version of a Monte-Carlo
algorithm given by Karp and Luby will be introduced and analyzed. For
the case of uniform edge failure probabilities, I will present a
worst-case bound on the number of samples that have to be drawn to
obtain an epsilon-delta approximation, being sharper than the original
upper bound. Computational results on two types of random networks
(directed acyclic Delaunay graphs and a slightly modified version of a
classical random graph) with up to one million vertices are presented.
These results show the advantage of the introduced Monte-Carlo approach
compared to direct simulation when small reliabilities have to be
estimated and demonstrate its applicability on large-scale instances.
Furthermore, applications to spreading processes on networks will be
highlighted.
There is no registration fee. Registration will be confirmed on a first
come-first served basis.
All participants, including speakers, must register using the following
registration form.
Registration deadline: August 20,
2007.
Today is December 01, 2007.
Sorry, the deadline is over.
Current number of registered participants: 67
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- Altinakar Sivan, EPFL, ROSE
- Antonini Gianluca, IBM Zurich Research
- Berrospi Cesar, IBM Zurich Research Laboratory
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- Bierlaire Michel, TRANSP-OR, EPFL
- Boedi Richard, IBM Research
- Bütikofer Stephan, Universität Zürich, IOR
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- Caimi Gabrio, ETH Zurich
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- Columbano Sebastiano, ETH Zurich
- Costa Daniel, President of Swiss Operation Research Society, and
Nestlé Lausanne/Parma
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- Cruz Mota Javier, TRANSP-OR, EPFL
- Dietrich Brenda, IBM Research
- Dos Santos Eleuterio Vania, ETH Zurich
- Eggenberg Niklaus, TRANSP-OR, EPFL
- Elisseeff Andre, IBM Research
- Foniok Jan, Charles University Prague / ETH Zürich
- Frauendorfer Karl, Univerrsity of St. Gallen
- Frejinger Emma, TRANSP-OR, EPFL
- Fuchsberger Martin, ETH Zurich
- Fukuda Komei, ETH Zurich
- Gambardella Luca, IDSIA
- Guarisco Michael, ETH Zurich
- Heusler Lucas, IBM Zurich Research Laboratory
- Janner Gabriele, ETH Zürich
- Jones Colin, ETH Zurich
- Kall Peter, University of Zurich
- Klatte Diethard, University of Zurich
- Labbé Martine, EURO President, and Université libre de Bruxelles,
Belgium
- Latif Shahzad, Technische Universität Hamburg-Harburg
- Laumanns Marco, IFOR, ETH Zurich
- Lee Jon, IBM Watson Research Center, Yorktown NY
- Liebling Thomas, ROSO - EPFL
- Lüthi Hans-Jakob, ETH Zurich
- Mastrolilli Monaldo, IDSIA
- Osorio Carolina, TRANSP-OR, EPFL
- Oyama Tatsuo, Vice President of the Operation Research Society of
Japan, and National Graduate Institute for Policy Studies
- Pednault Edwin, IBM Watson Research Center, Yorktown NY
- Pratsini Eleni, IBM Zurich Research Lab
- Prodon Alain, EPFL
- Reiner Gerald, University of Neuchâtel
- Ries Bernard, ROSE, EPFL
- Robin Thomas, TRANSP-OR, EPFL
- Rosta Vera, Renyi Institute of Mathematics
- Schimpel Ulrich, IBM Research, Zurich
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- Stauffer Gautier, IBM ZRL
- Sutter Reto, ETHZ
- Svensson Ola, IDSIA
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- Tiemessen Harold, IBM Zurich Research Lab
- Vacca Ilaria, TRANSP-OR, EPFL
- Vial Jean-Philippe, ORDECSYS and the University of Geneva
- von Bergen Silvia, University of Zurich
- Wagner Maik, Friedrich-Schiller University of Jena, Germany
- Widmer Marino, Université de Fribourg - DIUF
- Zenklusen Rico, IFOR
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