Journal of Graph Algorithms and Applications

Special Issue on Selected Papers from the Fourth International Workshop on Algorithms and Computation (WALCOM 2010)

Variants of Spreading Messages

T V Thirumala Reddy and C Pandu Rangan

Vol. 15, no. 5, pp. 683-699, 2011. Regular paper.

Abstract In a distributed computing environment a faulty node could lead other nodes in the system to behave in a faulty manner. An initial set of faults could make all the nodes in the system become faulty. Such a set is called an irreversible dynamo. This is modelled as spreading a message among individuals V in a community G=( V,E) where E represents the acquaintance relation. A particular individual will believe a message if some of the individual's acquaintances believe the same and forward the believed messages to its neighbours. We are interested in finding the minimum set of initial individuals to be considered as convinced, called the min-seed, such that every individual in the community is finally convinced. In this paper we give an upper bound on the cardinality of the min-seed for undirected graphs. We consider some interesting variants of the problem and analyse their complexities and give some approximate algorithms.

Submitted: April 2010.

Reviewed: November 2010.

Revised: February 2011.

Reviewed: June 2011.

Revised: July 2011.

Reviewed: August 2011.

Revised: August 2011.

Accepted: August 2011.

Final: September 2011.

Published: October 2011.

Communicated by Md. Saidur Rahman and Satoshi Fujita

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