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» Hybrid tractability of valued constraint problems
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CP
2009
Springer
15 years 10 months ago
The Complexity of Valued Constraint Models
The Valued Constraint Satisfaction Problem (VCSP) is a general framework encompassing many optimisation problems. We discuss precisely what it means for a problem to be modelled in...
Peter G. Jeavons, Stanislav Zivný
IJCAI
2003
14 years 11 months ago
A Maximal Tractable Class of Soft Constraints
Many optimization problems can be expressed us­ ing some form of soft constraints, where different measures of desirability arc associated with differ­ ent combinations of domai...
David A. Cohen, Martin C. Cooper, Peter Jeavons, A...
ECAI
2004
Springer
15 years 2 months ago
Tractable Symmetry Breaking Using Restricted Search Trees
We present a new conceptual abstraction in symmetry breaking – the GE-tree. The construction and traversal of a GE-tree breaks all symmetries in any constraint satisfaction or si...
Colva M. Roney-Dougal, Ian P. Gent, Tom Kelsey, St...
AAAI
2008
14 years 11 months ago
Hybrid Constraint Tightening for Solving Hybrid Scheduling Problems
Hybrid Scheduling Problems (HSPs) contain both temporal and finite-domain variables, as well as constraints between them. A hybrid constraint over temporal and finite-domain varia...
James C. Boerkoel Jr., Edmund H. Durfee
AIPS
2006
14 years 11 months ago
Tractable Optimal Competitive Scheduling
In this paper we describe the problem of Optimal Competitive Scheduling, which consists of activities that compete for a shared resource. The objective is to choose a subset of ac...
Jeremy Frank, James Crawford, Lina Khatib, Ronen I...