Ontology type: schema:Chapter
2010
AUTHORSPiotr Berman , Marek Karpinski , Andrzej Lingas
ABSTRACTFirst, we study geometric variants of the standard set cover motivated by assignment of directional antenna and shipping with deadlines, providing the first known polynomial-time exact solutions.Next, we consider the following general (non-necessarily geometric) capacitated set cover problem. There is given a set of elements with real weights and a family of sets of the elements. One can use a set if it is a subset of one of the sets in the family and the sum of the weights of its elements is at most one. The goal is to cover all the elements with the allowed sets.We show that any polynomial-time algorithm that approximates the uncapacitated version of the set cover problem with ratio r can be converted to an approximation algorithm for the capacitated version with ratio r + 1.357.The composition of these two results yields a polynomial-time approximation algorithm for the problem of covering a set of customers represented by a weighted n-point set with a minimum number of antennas of variable angular range and fixed capacity with ratio 2.357. More... »
PAGES226-234
Computing and Combinatorics
ISBN
978-3-642-14030-3
978-3-642-14031-0
http://scigraph.springernature.com/pub.10.1007/978-3-642-14031-0_26
DOIhttp://dx.doi.org/10.1007/978-3-642-14031-0_26
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