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It is our great pleasure to welcome you to the proceedings of the 17th International Conference on Database Systems for Advanced Applications (DASFAA 2012), which was held in Busan, Korea, in April, 2012. 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 (Preface

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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. The use of general descriptive names, registered names, trademarks, etc.

Violations are liable to prosecution under the German Copyright Law. 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. 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. Internet/Web and HCI В© Springer-Verlag Berlin Heidelberg 2012 This work is subject to copyright. ISSN 0302-9743 e-ISSN 1611-3349 ISBN 978-7-4 e-ISBN 978-8-1 DOI 10.1007/978-8-1 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2012933786 CR Subject Classification (1998): H.2-5, C.2, J.1, J.3 LNCS Sublibrary: SL 3 вЂ“ Information Systems and Application, incl. Volume Editors Sang-goo Lee Seoul National University, Seoul 151747, South Korea E-mail: Zhiyong Peng Wuhan University, Wuhan 430081, Hubei Province, China E-mail: Xiaofang Zhou University of Queensland, Brisbane, QLD 4072, Australia E-mail: Yang-Sae Moon Kangwon National University, Chuncheon 200701, Kangwon, South Korea E-mail: Rainer Unland University of Duisburg-Essen, 45117 Essen, Germany E-mail: Jaesoo Yoo Chungbuk National University, Cheongju 361-763, Chungbuk, South Korea E-mail: Sang-goo Lee Zhiyong Peng Xiaofang Zhou Yang-Sae Moon Rainer Unland Jaesoo Yoo (Eds.)Дatabase Systems forAdvancedApplications 17th International Conference, DASFAA 2012 Busan, South Korea, April 15-18, 2012 Proceedings, Part I 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 Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Kleinberg Cornell University, Ithaca, NY, USA Alfred Kobsa University of California, Irvine, CA, USA Friedemann Mattern ETH Zurich, Switzerland John C.

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Lecture Notes in Computer Science Commenced Publication in 1973 Founding and Former Series Editors: Gerhard Goos, Juris Hartmanis, and Jan van LeeuwenД®ditorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M.

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