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This book constitutes the thoroughly refereed joint post-workshop proceedings of four international workshops organized by the Japanese Society for Artificial Intelligence, held in Miyazaki, Japan, in June 2007 during the 21st Annual Conference JSAI 2007. The volume starts with 7 award winning papers of the JSAI 2007 main conference that are accompanied by 24 revised full workshop papers, carefully reviewed and selected from the following four co-located international workshops: Logic and Engineering of Natural Language Semantics (LENLS 2007), International Workshop on Risk Informatics...

We cordially welcome you to the proceedings of the 2007 International S- posium on Ubiquitous Computing Systems (UCS) held at Akihabara, Tokyo, Japan. UCS has become a symposium for the dissemination of state-of-the-art research and engineering practices in ubiquitous computing with particular - phasis on systems and software. UCS 2007 was the fourth of this series of int- nationalsymposia.ThiswastheyearfortheNextGenerationNetwork(NGN)to be commercially launched so that the Internet could become the infrastructure forcommunicationsandcomputingsubstitutingtheNGNintelephonenetworks. The...

Written chemical formulas, such as C2H6O, can tell us the constituent atoms a molecule contains but they cannot differentiate between the possible geometrical arrangements (isomers) of these models. Yet the chemical properties of different isomers can vary hugely. Therefore, to understand the world of chemistry we need to ask what kind of isomers can be produced from a given atomic composition, how are isomers converted into each other, how do they decompose into smaller pieces, and how can they be made from smaller pieces? The answers to these questions will help us to discover new chemistry...