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A New Multi-resource cumulatives Constraint with Negative Heights

  • Nicolas Beldiceanu
  • Mats Carlsson
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2470)

Abstract

This paper presents a new cumulatives constraint, which generalizes the original cumulative constraint in different ways. The two most important aspects consist in permitting multiple cumulative resources as well as negative heights for the resource consumption of the tasks. This allows modeling in an easy way workload covering, producer-consumer, and scheduling problems. The introduction of negative heights has forced us to come up with new filtering algorithms and to revisit existing ones. The first filtering algorithm is derived from an idea called sweep, which is extensively used in computational geometry; the second algorithm is based on a combination of sweep and constructive disjunction; while the last is a generalization of task intervals to this new context. A real-life crew scheduling problem originally motivated this constraint which was implemented within the SICStus finite domain solver and evaluated against different problem patterns.

Keywords

Schedule Problem Resource Consumption Project Schedule Problem Pattern Sweep Algorithm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Nicolas Beldiceanu
    • 1
  • Mats Carlsson
    • 1
  1. 1.SICSUppsalaSweden

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