On the approximability of minimum topic connected overlay and its special instances

Jun Hosoda, Juraj Hromkovič, Taisuke Izumi, Hirotaka Ono, Monika Steinová, Koichi Wada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the context of designing a scalable overlay network to support decentralized topic-based pub/sub communication, the Minimum Topic-Connected Overlay problem (Min-TCO in short) has been investigated: Given a set of t topics, collection of n users together with the lists of topics they are interested in, the aim is to connect these users to a network by a minimum number of edges such that every graph induced by users interested in a common topic is connected. It is known that Min-TCO is NP-hard and approximable within O(logt) in polynomial time. In this paper, we further investigate the problem and some of its special instances. We give various hardness results for instances where the number of users interested in a common topic is constant, and also for the instances where the number of topics in which an user is interested in is bounded by a constant. Furthermore, we close the gap of hardness of Min-TCO by showing its LOGAPX-completeness. We also present a few polynomial-time algorithms for very restricted instances of Min-TCO.

Original languageEnglish
Title of host publicationMathematical Foundations of Computer Science 2011 - 36th International Symposium, MFCS 2011, Proceedings
Pages376-387
Number of pages12
DOIs
Publication statusPublished - Sep 1 2011
Event36th International Symposium on Mathematical Foundations of Computer Science, MFCS 2011 - Warsaw, Poland
Duration: Aug 22 2011Aug 26 2011

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume6907 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Other

Other36th International Symposium on Mathematical Foundations of Computer Science, MFCS 2011
CountryPoland
CityWarsaw
Period8/22/118/26/11

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • Computer Science(all)

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