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A Branch-and-Price Algorithm for Multi-mode Resource Leveling

  • Eamonn T. Coughlan
  • Marco E. Lübbecke
  • Jens Schulz
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6049)

Abstract

Resource leveling is a variant of resource-constrained project scheduling in which a non-regular objective function, the resource availability cost, is to be minimized. We present a branch-and-price approach together with a new heuristic to solve the more general turnaround scheduling problem. Besides precedence and resource constraints, also availability periods and multiple modes per job have to be taken into account. Time-indexed mixed integer programming formulations for similar problems quite often fail already on instances with only 30 jobs, depending on the network complexity and the total freedom of arranging jobs. A reason is the typically very weak linear programming relaxation. In particular for larger instances, our approach gives tighter bounds, enabling us to optimally solve instances with 50 multi-mode jobs.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Eamonn T. Coughlan
    • 1
  • Marco E. Lübbecke
    • 2
  • Jens Schulz
    • 1
  1. 1.Institut für MathematikTechnische Universität BerlinBerlinGermany
  2. 2.Fachbereich MathematikTechnische Universität DarmstadtDarmstadtGermany

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