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» Hybrid tractability of valued constraint problems
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CSR
2007
Springer
14 years 1 months ago
Ruling Out Polynomial-Time Approximation Schemes for Hard Constraint Satisfaction Problems
The maximum constraint satisfaction problem (Max CSP) is the following computational problem: an instance is a finite collection of constraints on a set of variables, and the goal...
Peter Jonsson, Andrei A. Krokhin, Fredrik Kuivinen
FORMATS
2005
Springer
14 years 26 days ago
Reachability Problems on Extended O-Minimal Hybrid Automata
Within hybrid systems theory, o-minimal automata are often considered on the border between decidability and undecidability. In such classes of hybrid automata, the constraint of h...
Raffaella Gentilini
DASFAA
2011
IEEE
206views Database» more  DASFAA 2011»
12 years 11 months ago
A Hybrid Algorithm for Finding Top-k Twig Answers in Probabilistic XML
Abstract. Uncertainty is inherently ubiquitous in data of real applications, and those uncertain data can be naturally represented by the XML. Matching twig pattern against XML dat...
Bo Ning, Chengfei Liu
ICALP
2007
Springer
14 years 1 months ago
Universal Algebra and Hardness Results for Constraint Satisfaction Problems
We present algebraic conditions on constraint languages Γ that ensure the hardness of the constraint satisfaction problem CSP(Γ) for complexity classes L, NL, P, NP and ModpL. Th...
Benoit Larose, Pascal Tesson
CEC
2007
IEEE
13 years 11 months ago
A hybrid evolutionary approach to the university course timetabling problem
Combinations of evolutionary based approaches with local search have provided very good results for a variety of scheduling problems. This paper describes the development of such a...
Salwani Abdullah, Edmund K. Burke, Barry McCollum