Fourth IFIP International Conference on Theoretical Computer Science- TCS 2006 : IFIP 19th Worm Computer Congress, TC-1, Foundations of Computer Science, August 23-24, 2006, Santiago, Chile

International Federation for Information Processing The IFIP series publishes state-of-the-art results in the sciences and technologies of information and communication. The scope of the series includes: foundations of computer science; software theory and practice; education; computer applications in technology; communication systems; systems modeling and optimization; information systems; computers and society; computer systems technology; security and protection in information processing systems; artificial intelligence; and human-computer interaction. Proceedings and post-proceedings of referred international conferences in computer science and interdisciplinary fields are featured. These results often precede journal publication and represent the most current research. The principal aim of the IFIP series is to encourage education and the dissemination and exchange of information about all aspects of computing. For more information about the 300 other books in the IFIP series, please visit www.springer.com. For more information about IFIP, please visit www.ifip.org. Front Matter....Pages I-XII Front Matter....Pages 1-1 Locality of Queries and Transformations....Pages 3-3 From Informatics to Quantum Informatics....Pages 5-5 RDF as a Data Model....Pages 7-7 Adversarial Queueing Theory Revisited....Pages 9-10 Distributed Algorithms for Autonomous Mobile Robots....Pages 11-11 Recursion and Probability....Pages 13-13 Front Matter....Pages 15-15 From Informatics to Quantum Informatics....Pages 17-46 Distributed Algorithms for Autonomous Mobile Robots....Pages 47-62 Front Matter....Pages 63-63 The Unsplittable Stable Marriage Problem....Pages 65-75 Variations on an Ordering Theme with Constraints....Pages 77-90 BuST-Bundled Suffix Trees....Pages 91-102 An O(1) Solution to the Prefix Sum Problem on a Specialized Memory Architecture....Pages 103-114 An Algorithm to Reduce the Communication Traffic for Multi-Word Searches in a Distributed Hash Table....Pages 115-129 Exploring an Unknown Graph to Locate a Black Hole Using Tokens....Pages 131-150 Fast Cellular Automata with Restricted Inter-Cell Communication: Computational Capacity....Pages 151-164 Asynchonous Distributed Components: Concurrency and Determinacy....Pages 165-183 Decidable Properties for Regular Cellular Automata....Pages 185-196 Symbolic Determinisation of Extended Automata....Pages 197-212 Regular Hedge Model Checking....Pages 213-230 Completing Categorical Algebras....Pages 231-249 Front Matter....Pages 63-63 Reusing Optimal TSP Solutions for Locally Modified Input Instances....Pages 251-270 Spectral Partitioning of Random Graphs with Given Expected Degrees....Pages 271-282 A Connectivity Rating for Vertices in Networks....Pages 283-298 On PTAS for Planar Graph Problems....Pages 299-313 Back Matter....Pages 315-315 The papers contained in this volume were presented at the fourth edition of the IFIP International Conference on Theoretical Computer Science (IFIP TCS), held August 23-24, 2006 in Santiago, Chile. They were selected from 44 pa­ pers submitted from 17 countries in response to the call for papers. A total of 16 submissions were accepted as full papers, yielding an acceptance rate of about 36%. Papers sohcited for IFIP TCS 2006 were meant to constitute orig­ inal contributions in two general areas: Algorithms, Complexity and Models of Computation; and Logic, Semantics, Specification and Verification. The conference also included six invited presentations: Marcelo Arenas (P- tificia Universidad Catolica de Chile, Chile), Jozef Gruska (Masaryk University, Czech Republic), Claudio Gutierrez (Universidad de Chile, Chile), Marcos Kiwi (Universidad de Chile, Chile), Nicola Santoro (Carleton University, Canada), and Mihalis Yannakakis (Columbia University, USA). The abstracts of those presentations are included in this volume. In addition, Jozef Gruska and Nicola Santoro accepted our invitation to write full papers related to their talks. Those two surveys are included in the present volume as well. TCS is a biannual conference. The first edition was held in Sendai (Japan, 2000), followed by Montreal (Canada, 2002) and Toulouse (France, 2004).