Approximation Algorithms for Connected Dominating Sets
 S. Guha,
 S. Khuller
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The dominating set problem in graphs asks for a minimum size subset of vertices with the following property: each vertex is required to be either in the dominating set, or adjacent to some vertex in the dominating set. We focus on the related question of finding a connected dominating set of minimum size, where the graph induced by vertices in the dominating set is required to be connected as well. This problem arises in network testing, as well as in wireless communication.
Two polynomial time algorithms that achieve approximation factors of 2H(Δ)+2 and H(Δ)+2 are presented, where Δ is the maximum degree and H is the harmonic function. This question also arises in relation to the traveling tourist problem, where one is looking for the shortest tour such that each vertex is either visited or has at least one of its neighbors visited. We also consider a generalization of the problem to the weighted case, and give an algorithm with an approximation factor of (c _{ n } +1) \ln n where c _{ n } ln k is the approximation factor for the node weighted Steiner tree problem (currently c _{ n } = 1.6103 ). We also consider the more general problem of finding a connected dominating set of a specified subset of vertices and provide a polynomial time algorithm with a (c+1) H(Δ) +c1 approximation factor, where c is the Steiner approximation ratio for graphs (currently c = 1.644 ).
 Title
 Approximation Algorithms for Connected Dominating Sets
 Journal

Algorithmica
Volume 20, Issue 4 , pp 374387
 Cover Date
 199804
 DOI
 10.1007/PL00009201
 Print ISSN
 01784617
 Online ISSN
 14320541
 Publisher
 SpringerVerlag
 Additional Links
 Topics
 Keywords

 Key words. Approximation algorithms, Steiner trees, Dominating sets, Graph algorithms.
 Industry Sectors
 Authors

 S. Guha ^{(1)}
 S. Khuller ^{(2)}
 Author Affiliations

 1. Department of Computer Science, Stanford University, Stanford, CA, 94305, USA
 2. Department of Computer Science and UMIACS, University of Maryland, College Park, MD, 20742, USA