Information and Communication Technologies 18th EUNICE/ IFIP WG 6.2,

This book constitutes the refereed proceedings of the 18th EUNICE 2011 conference on information and communication technologies, held in Budapest, in August 2012. The 23 oral papers demostrated together with 15 poster presentations were carefully reviewed

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Alfred Kobsa University of California, Irvine, CA, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen TU Dortmund University, Germany Madhu Sudan Microsoft Research, Cambridge, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Gerhard Weikum Max Planck Institute for Informatics, Saarbruecken, Germany

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Róbert Szabó Attila Vidács (Eds.)

Information and Communication Technologies 18th EUNICE/IFIP WG 6.2, 6.6. International Conference, EUNICE 2012 Budapest, Hungary, August 29-31, 2012 Proceedings

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Volume Editors Róbert Szabó Attila Vidács Budapest University of Technology and Economics Department of Telecommunications and Media Informatics Magyar Tudósok krt.2 1117 Budapest, Hungary E-mail: {robert.szabo, vidacs}@tmit.bme.hu

ISSN 0302-9743 e-ISSN 1611-3349 ISBN 978-3-642-32807-7 e-ISBN 978-3-642-32808-4 DOI 10.1007/978-3-642-32808-4 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2012944852 CR Subject Classification (1998): C.2.0-2, C.2, H.3.3-5, F.2.2, C.0, K.6, H.4 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI

© IFIP International Federation for Information Processing 2012 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. The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

Preface

It was a great pleasure for me and a great honor for the Department of Telecommunications and Media Informatics of the Budapest University of Technology and Economics to host the 18th EUNICE Conference on Information and Communication Technologies in our capital, Budapest. The aim of the annual E