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Preprints 2010

A Constraint Integer Programming Approach for Resource-Constrained Project Scheduling
Citation key Report-003-2010
Author Timo Berthold and Stefan Heinz and Marco E. Lübbecke and Rolf H. Möhring and Jens Schulz
Year 2010
Number 003
Institution Technische Universität Berlin, Institut für Mathematik
Abstract We propose a hybrid approach for solving the resource-constrained project scheduling problem which is an extremely hard to solve combinatorial optimization problem of practical relevance. Jobs have to be scheduled on (renewable) resources subject to precedence constraints such that the resource capacities are never exceeded and the latest completion time of all jobs is minimized. The problem has challenged researchers from different communities, such as integer programming (IP), constraint programming (CP), and satisfiability testing (SAT). Still, there are instances with $60$ jobs which have not been solved for many years. The currently best known approach, \emphlazyFD, is a hybrid between CP and SAT techniques. In this paper we propose an even stronger hybridization by integrating all the three areas, IP, CP, and SAT, into a single branch-and-bound scheme. We show that lower bounds from the linear relaxation of the IP formulation and conflict analysis are key ingredients for pruning the search tree. First computational experiments show very promising results. For five instances of the well-known PSPLIB we report an improvement of lower bounds. Our implementation is generic, thus it can be potentially applied to similar problems as well.
Bibtex Type of Publication Preprint
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