Structural Information and Communication Complexity: 18th by Colin Cooper (auth.), Adrian Kosowski, Masafumi Yamashita

By Colin Cooper (auth.), Adrian Kosowski, Masafumi Yamashita (eds.)

This publication constitutes the refereed lawsuits of the 18th overseas Colloquium on Structural info and communique Complexity, SIROCCO 2011, held in Gdańsk, Poland, in June 2011. The 24 revised complete papers awarded including 1 survey lecture and a pair of invited talks have been conscientiously reviewed and chosen from fifty seven submissions. The papers are prepared in topical part on fault tolerance, routing, cellular brokers, cellular robots, probabilistic tools, dispensed algorithms on graphs, and ad-hoc networks.

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Additional info for Structural Information and Communication Complexity: 18th International Colloquium, SIROCCO 2011, Gdańsk, Poland, June 26-29, 2011. Proceedings

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A algorithm A solves a problem P subject to omission scheme S with initial configuration ι, if, for any scenario w ∈ S, there exists u ∈ Pref (w) such that the state sx (u) of each process x ∈ V satisfies the specifications of P for initial configuration ι. In such a case, A is said to be S-reliable for P. Definition 5. If there exists an algorithm that solves a problem P subject to omission scheme S, then we say that P is S−solvable. 3 The Problems The Binary Consensus Problem. A set of synchronous processes wishes to agree about a binary value.

Journal of the ACM 27(2), 228–234 (1980) 9. : Infinite Words. Elsevier, Amsterdam (2004) 10. : Consensus in synchronous systems:a concise guided tour. IEEE Pacific Rim International Symposium on Dependable Computing 0, 221 (2002) 11. : Time is not a healer. , Monien, B. ) STACS 1989. LNCS, vol. 349, pp. 304–313. Springer, Heidelberg (1989) 12. : Agreement in synchronous networks with ubiquitous faults. Theor. Comput. Sci. 384(2-3), 232–249 (2007) 13. : Impossibility results and lower bounds for consensus under link failures.

Consensus vs. Broadcast in Communication Networks 31 Our Contributions. In this paper, we investigate systems in which the pattern of omission failures is arbitrary. A set of simultaneous omissions is called a communication event. We characterize the solvability of the Broadcast and Consensus problems subject to an arbitrary family of possible communication events. A node from which it is possible to broadcast if the system is restricted to a given communication event is called a source for the communication event.

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