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GLOBECOM
2008
IEEE
15 years 11 months ago
Impact of Constraints on the Complexity of Dynamic Spectrum Assignment
— In this paper we study the complexity of spectrum assignment problems in cognitive radio networks (CRNs) in the presence of several constraints. Although optimal spectrum assig...
Chetan Nanjunda Mathur, Mohamed A. Haleem, Rajarat...
AAIM
2007
Springer
188views Algorithms» more  AAIM 2007»
15 years 10 months ago
Approximation Algorithms for the Graph Orientation Minimizing the Maximum Weighted Outdegree
Given an undirected graph G = (V, E) and a weight function w : E → Z+ , we consider the problem of orienting all edges in E so that the maximum weighted outdegree among all verti...
Yuichi Asahiro, Jesper Jansson, Eiji Miyano, Hirot...
EPIA
2005
Springer
15 years 10 months ago
Reducing Propositional Theories in Equilibrium Logic to Logic Programs
The paper studies reductions of propositional theories in equilibrium logic to logic programs under answer set semantics. Specifically we are concerned with the question of how to...
Pedro Cabalar, David Pearce, Agustín Valver...
ESA
2004
Springer
139views Algorithms» more  ESA 2004»
15 years 10 months ago
Comparing Real Algebraic Numbers of Small Degree
We study polynomials of degree up to 4 over the rationals or a computable real subfield. Our motivation comes from the need to evaluate predicates in nonlinear computational geome...
Ioannis Z. Emiris, Elias P. Tsigaridas
ISAAC
2004
Springer
141views Algorithms» more  ISAAC 2004»
15 years 10 months ago
Weighted Coloring on Planar, Bipartite and Split Graphs: Complexity and Improved Approximation
We study complexity and approximation of min weighted node coloring in planar, bipartite and split graphs. We show that this problem is NP-complete in planar graphs, even if they a...
Jérôme Monnot, Vangelis Th. Paschos, ...