Personne

Dominique de Werra

Publications associées (46)

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Publications de Dominique de Werra | EPFL Graph Search

A tutorial on the use of graph coloring for some problems in robotics

Dominique de Werra, Tinaz Ekim

We study the problem where a robot has to pick up items of different sizes which are stored along a corridor. A natural requirement is that the items have to be collected in decreasing order of their sizes. We deal with various systems according to the loc ...

2009

Finding Hamiltonian circuits in quasi-adjoint graphs

Dominique de Werra, Benjamin Leroy-Beaulieu

This paper is motivated by a method used for DNA sequencing by hybridization presented in [Jacek Blazewicz, Marta Kasprzak, Computational complexity of isothernnic DNA sequencing by hybridization, Discrete Appl. Math. 154 (5) (2006) 718-7291. This paper pr ...

2008

On two coloring problems in mixed graphs

Dominique de Werra, Bernard Ries

We are interested in coloring the vertices of a mixed graph, i.e., a graph containing edges and arcs. We consider two different coloring problems: in the first one we want adjacent vertices to have different colors and the tail of an arc to get a color str ...

2008

Preemptive open shop scheduling with multiprocessors: polynomial cases and applications

Dominique de Werra

This paper addresses a multiprocessor generalization of the preemptive open-shop scheduling problem. The set of processors is partitioned into two groups and the operations of the jobs may require either single processors in either group or simultaneously ...

2008

On a graph coloring problem arising from discrete tomography

Dominique de Werra, Bernard Ries

An extension of the basic image reconstruction problem in discrete tomography is considered: given a graph

G=(V,E)

and a family

\mathcal{P}

of chains

P_i

together with vectors

h(P_i)=(h_{i}^{1},...,h_{i}^{k})

, one wants to find a partition $V^{1},. ...

2008

Bicolored matchings in some classes of graphs

Dominique de Werra, Bernard Ries

We consider the problem of finding in a graph a set

R

of edges to be colored in red so that there are maximum matchings having some prescribed numbers of red edges. For regular bipartite graphs with

n

nodes on each side, we give sufficient conditions f ...

2007

Variations of split-coloring in permutation graphs

Dominique de Werra, Tinaz Ekim

Combinatorial optimization problems related to permutations have been widely studied. Here, we consider different generalizations of the usual coloring problem in permutation graphs. A cocoloring is a partition of a permutation into increasing and decreasi ...

2006

Partitioning cographs into cliques and stable sets

Dominique de Werra, Tinaz Ekim

We consider the problem of partitioning the node set of a graph into p cliques and k stable sets, namely the (p,k)-coloring problem. Results have been obtained for general graphs \cite{hellcomp}, chordal graphs \cite{hellchordal} and cacti for the case whe ...

2005

Preemptive open shop scheduling with multiprocessors: polynomial cases and applications

Dominique de Werra

2004

Recherche opérationnelle pour ingénieurs I

Dominique de Werra, Thomas Liebling, Jean-François Hêche

Permettant la conception et l'entretien de systèmes logistiques et techniques toujours plus complexes, la recherche opérationnelle fait aujourd'hui partie du bagage essentiel à tout ingénieur. Avec un formalisme mathématique réduit, ce livre offre une intr ...

PPUR2003