Location and Context Awareness: 4th International Symposium, LoCA 2009 Tokyo, Japan, May 7-8, 2009 Proceedings (Lecture Notes in Computer Science, 5561)

Annotation This book constitutes the refereed proceedings of the 4th International Symposium on Location and Context Awareness, LoCA 2009, held in Tokyo, Japan, in May 2009. The 18 revised full papers presented were carefully selected from 77 submissions. The papers describe original, previously unpublished research results, including new hardware platforms for sensing location and context, machine learning techniques for inferring user location and context from low-level sensor data, location and context representation, management, and distribution, and privacy policies and communication protocols for location and context information Front Matter....Pages - Multi Activity Recognition Based on Bodymodel-Derived Primitives....Pages 1-18 Activity Inference through Sequence Alignment....Pages 19-36 Improving Location Fingerprinting through Motion Detection and Asynchronous Interval Labeling....Pages 37-51 Using Context Annotated Mobility Profiles to Recruit Data Collectors in Participatory Sensing....Pages 52-69 Location Diversity: Enhanced Privacy Protection in Location Based Services....Pages 70-87 Nonvisual, Distal Tracking of Mobile Remote Agents in Geosocial Interaction....Pages 88-102 Directional Beaconing: A Robust WiFi Positioning Method Using Angle-of-Emission Information....Pages 103-119 Bluetooth Tracking without Discoverability....Pages 120-137 Error Estimation for Indoor 802.11 Location Fingerprinting....Pages 138-155 Activity Recognition from Sparsely Labeled Data Using Multi-Instance Learning....Pages 156-173 A Framework for Creating and Using Maps of Privately Owned Spaces....Pages 174-191 Daily Routine Recognition through Activity Spotting....Pages 192-206 SofTOA: Software Ranging for TOA-Based Positioning of WLAN Terminals....Pages 207-221 Position Estimation from UWB Pseudorange and Angle-of-Arrival: A Comparison of Non-linear Regression and Kalman Filtering....Pages 222-239 An Ultrasonic 3D Positioning System Using a Single Compact Receiver Unit....Pages 240-253 LOCK: A Highly Accurate, Easy-to-Use Location-Based Access Control System....Pages 254-270 Characterizing the Space by Presenting Non-visual Information....Pages 271-282 Back Matter....Pages - These proceedings contain the papers presented at the 4th International S- posium on Location and Context Awareness (LoCA) during May 7–8, 2009 in Tokyo,Japan.Locationandcontextawarenessarefundamentstonext-generation mobile and pervasive computing systems. Pervasive computing is a model of computing in which computation is everywhere and computer functions are - tegrated into everything. The ultimate aim is to make information, applications and services available anywhere and at anytime in the human environment in a ?uid manner appropriate to our current context. Once away from the desktop, we ?nd ourselves in a wide variety of contexts and hence situations. For computing to be relevant and useful in these emerging situations we must rely on a range of contextual cues. Context includes phys- logical, environmental, and computational data, whether sensed or inferred. In addition, context includes details of a user’s activities, goals, abilities, pref- ences, a?ordances, and surroundings. With location and context awareness we can expect computers to deliver information, services, and entertainment in a way that maximizes convenience and minimizes intrusion.