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» Complexity of Graph Covering Problems
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CORR
2010
Springer
104views Education» more  CORR 2010»
13 years 7 months ago
Approximating the minimum directed tree cover
Given a directed graph G with non negative cost on the arcs, a directed tree cover of G is a directed tree such that either head or tail (or both of them) of every arc in G is touc...
Viet Hung Nguyen
ICDE
2010
IEEE
193views Database» more  ICDE 2010»
14 years 2 months ago
Schema covering: a step towards enabling reuse in information integration
Abstract—We introduce schema covering, the problem of identifying easily understandable common objects for describing large and complex schemas. Defining transformations between...
Barna Saha, Ioana Stanoi, Kenneth L. Clarkson
ICDCS
2007
IEEE
14 years 1 months ago
Approximate Covering Detection among Content-Based Subscriptions Using Space Filling Curves
We consider a problem that arises during the propagation of subscriptions in a contentbased publish-subscribe system. Subscription covering is a promising optimization that reduce...
Zhenhui Shen, Srikanta Tirthapura
FOCS
2009
IEEE
14 years 2 months ago
Approximability of Combinatorial Problems with Multi-agent Submodular Cost Functions
Abstract— Applications in complex systems such as the Internet have spawned recent interest in studying situations involving multiple agents with their individual cost or utility...
Gagan Goel, Chinmay Karande, Pushkar Tripathi, Lei...
STOC
2010
ACM
245views Algorithms» more  STOC 2010»
14 years 12 days ago
Weighted Geometric Set Cover via Quasi-Uniform Sampling
There has been much progress on geometric set cover problems, but most known techniques only apply to the unweighted setting. For the weighted setting, very few results are known ...
Kasturi Varadarajan