Ubiquitous Computing Systems Third International Symposium, UCS 2006

We cordially welcome you to the proceedings of the 2006 International Symposium on Ubiquitous Computing Systems (UCS) held in Seoul, Korea. UCS has been a symposium for dissemination of state-of-the-art research and engineering practices in ubiquitous com

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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 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 University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Moshe Y. Vardi Rice University, Houston, TX, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Hee Yong Youn Minkoo Kim Hiroyuki Morikawa (Eds.)

Ubiquitous Computing Systems Third International Symposium, UCS 2006 Seoul, Korea, October 11-13, 2006 Proceedings

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Volume Editors Hee Yong Youn School of Information and Communication Engineering Sungkyunkwan University Jangangu Chunchundong 300 Suwon, Korea E-mail: [email protected] Minkoo Kim College of Information Technology Ajou University San 5, Woncheon-Dong, Yeongtong-Gu Suwon, Korea E-mail: [email protected] Hiroyuki Morikawa The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-8656 Japan E-mail: [email protected]

Library of Congress Control Number: 2006933414 CR Subject Classification (1998): C.2, C.3, C.5.3, D.2, D.4, H.4, H.5, K.4, J.7 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-46287-2 Springer Berlin Heidelberg New York 978-3-540-46287-3 Springer Berlin Heidelberg New York

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Preface

We cordially welcome you to the proceedings of the 2006 International Symposium on Ubiquitous Computing Systems (UCS) held in Seoul, Korea. UCS has been a symposium for dissemination of state-of-the-art research and engineering practices in ubiquitous computing with particular emphasis on systems and software. 2006 UCS was the third of this series of international symposia, and its importance i