UbiComp 2007: Ubiquitous Computing 9th International Conference, Ubi

The Ubiquitous Computing conference series provides the premier forum in which to present original research results in all areas relating to the design, implementation, app- cation and evaluation of ubiquitous computing technologies. It is a well-establis

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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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John Krumm Gregory D. Abowd Aruna Seneviratne Thomas Strang (Eds.)

UbiComp 2007: Ubiquitous Computing 9th International Conference, UbiComp 2007 Innsbruck, Austria, September 16-19, 2007 Proceedings

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Volume Editors John Krumm Microsoft Research Redmond, WA 98052 USA E-mail: [email protected] Gregory D. Abowd Georgia Institute of Technology 5th Street NW, Atlanta GA 30332-0280, USA E-mail: [email protected] Aruna Seneviratne National ICT of Australia (NICTA) Eveleigh, NSW 1430, Australia E-mail: [email protected] Thomas Strang German Aerospace Center 82234 Wessling/Oberpfaffenhofen, Germany E-mail: [email protected] and University of Innsbruck 6020 Innsbruck, Austria [email protected]

Library of Congress Control Number: 2007934832 CR Subject Classification (1998): C.2, C.3, D.2, D.4, H.4, H.5, K.4 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-74852-0 Springer Berlin Heidelberg New York 978-3-540-74852-6 Springer Berlin Heidelberg New York

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Preface

The Ubiquitous Computing conference series provides the premier forum in which to present original research results in all areas relating to the design, implementation, application and evaluation of ubiquitous computing technologies. It is a well-established platform to introdu