Progress in Artificial Intelligence 14th Portuguese Conference on Ar

This book contains a selection of higher quality and reviewed papers of the 14th Portuguese Conference on Artificial Intelligence, EPIA 2009, held in Aveiro, Portugal, in October 2009. The 55 revised full papers presented were carefully reviewed and selec

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Subseries of Lecture Notes in Computer Science

5816

Luís Seabra Lopes Nuno Lau Pedro Mariano Luís M. Rocha (Eds.)

Progress in Artificial Intelligence 14th Portuguese Conference on Artificial Intelligence, EPIA 2009 Aveiro, Portugal, October 12-15, 2009 Proceedings

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Series Editors Randy Goebel, University of Alberta, Edmonton, Canada Jörg Siekmann, University of Saarland, Saarbrücken, Germany Wolfgang Wahlster, DFKI and University of Saarland, Saarbrücken, Germany Volume Editors Luís Seabra Lopes Nuno Lau Pedro Mariano Departamento de Electrónica, Telecomunicações e Informática Universidade de Aveiro Aveiro, Portugal E-mail: {lsl, nunolau, plsm}@ua.pt Luís M. Rocha School of Informatics & Computing Cognitive Science Program Indiana University, Bloomington, IN, USA E-mail: [email protected]

Library of Congress Control Number: 2009935766 CR Subject Classification (1998): I.2, J.4, H.3, H.5.2, I.5, I.4, K.4, K.3 LNCS Sublibrary: SL 7 – Artificial Intelligence ISSN ISBN-10 ISBN-13

0302-9743 3-642-04685-1 Springer Berlin Heidelberg New York 978-3-642-04685-8 Springer Berlin Heidelberg New York

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. springer.com © Springer-Verlag Berlin Heidelberg 2009 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 12767465 06/3180 543210

Preface

The 14th Portuguese Conference on Artificial Intelligence, EPIA 2009, took place at Hotel Meli´a Ria, in Aveiro, Portugal, in October 12–15, 2009. This international conference was organized by the University of Aveiro and, as in previous years, was held under the auspices of the Portuguese Association for Artificial Intelligence (APPIA). The purpose of EPIA 2009 was to promote research in all areas of Artificial Intelligence (AI), covering both theoretical/foundational issues and applications, and to encourage the scientific exchange among researchers, engineers and practitioners in related disciplines. To promote discussions among participants, EPIA 2009 was structured as a set of thematic tracks proposed by the international AI research community. Thematic tracks are intended to provide an informal environment that fosters the active cross-fertilization of ideas between researchers within specific subareas of AI, including theoretical/foundational, integrative, application-oriented and newly emerging areas. The proposals received in response to a public Call for Thematic Tracks were evaluated by the Program