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- Renaud Hartert, Stefano Vissicchio, +4 authors Pierre François
- Computer Communication Review
- 2015

SDN simplifies network management by relying on declarativity (high-level interface) and expressiveness (network flexibility). We propose a solution to support those features while preserving high robustness and scalability as needed in carrier-grade networks. Our solution is based on (i) a two-layer architecture separating connectivity and optimization… (More)

- Pierre Schaus, Yves Deville, Pierre Dupont
- CP
- 2007

Deviation is a recent constraint to balance a set of variables with respect to a given mean. We show that the propagators recently introduced are not bound-consistent when the mean is rational. We introduce bound-consistent propagators running in linear time with respect to the number of variables. We evaluate the improvement in terms of efficiency and… (More)

- Pierre Schaus, Jean-Charles Régin
- EURO J. Computational Optimization
- 2014

- Steven Gay, Renaud Hartert, Pierre Schaus
- CPAIOR
- 2015

- Pierre Schaus, Pascal Van Hentenryck, Jean-Charles Régin
- CPAIOR
- 2009

This paper considers the daily assignment of newborn infant patients to nurses in a hospital. The objective is to balance the workload of the nurses, while satisfying a variety of side constraints. Prior work proposed a MIP model for this problem, which unfortunately did not scale to large instances and only approximated the objective function, since… (More)

- Pierre Schaus, Yves Deville, Pierre Dupont, Jean-Charles Régin
- CPAIOR
- 2007

This paper introduces DEVIATION, a soft global constraint to obtain balanced solutions. A violation measure of the perfect balance can be defined as the Lp norm of the vector variables minus their mean. SPREAD constraints the sum of square deviations to the mean [5, 7] i.e. the L2 norm. The L1 norm is considered here. Neither criterion subsumes the other… (More)

Many assignment problems require the solution to be balanced. Such a problem is the Balanced Academic Curriculum Problem (BACP) [1]. Standard deviation is a common way to measure the balance of a set of values. A recent constraint presented by Pesant and Régin [2] enforces the mean µ and the standard deviation σ of a set of variables. Our work extends [2]… (More)

- Pierre Schaus
- 2009

This work could not have been achieved without the support of the following persons. My parents who encourage me to finish this thesis (even by coming in Providence). They are great example for their five children. My wife Caro who supports me everyday. She's always there to remind me what is the most important in my life and helps me to find a good balance… (More)

- Pierre Schaus, Pascal Van Hentenryck, Jean-Noël Monette, Carleton Coffrin, Laurent D. Michel, Yves Deville
- Constraints
- 2011

The Steel Mill Slab Problem is an optimization benchmark that has been studied for a long time in the constraint-programming community but was only solved efficiently in the two last years. Gargani and Refalo solved the problem using Large Neighborhood Search and Van Henten-ryck and Michel made use of constraint programming with an improved symmetry… (More)

- Pierre Schaus, Renaud Hartert
- CP
- 2013

Large neighborhood search (LNS) [25] is a framework that combines the expressiveness of constraint programming with the efficiency of local search to solve combinatorial optimization problems. This paper introduces an extension of LNS, called multi-objective LNS (MO-LNS), to solve multi-objective combi-natorial optimization problems ubiquitous in practice.… (More)