Keynote Speeches -- Distributed Computing in Opportunistic Environments -- Web of Things as a Framework for Ubiquitous Intelligence and Computing -- Context Awareness -- Inferring Human Interactions in Meetings: A Multimodal Approach -- Gesture Recognition with a 3-D Accelerometer -- Context-Aware Activity Recognition through a Combination of Ontological and Statistical Reasoning -- Context-Aware Path Planning in Ubiquitous Network -- Middleware and Services -- An Efficient Approach to Situation-Aware Service Discovery in Pervasive Service Computing Environments -- Printing in Ubiquitous Computing Environments -- The Å Publish/Subscribe Framework -- Mining and Visualizing Mobile Social Network Based on Bayesian Probabilistic Model -- Routing and Sensor Networks -- SMSR: A Scalable Multipath Source Routing Protocol for Wireless Sensor Networks -- A Framework to Calibrate a MEMS Sensor Network -- Application Domain Driven Data Visualisation Framework for Wireless Sensor Networks -- Hybrid Bluetooth Scatternet Routing -- Ubiquitous Networks and Devices -- Self-estimation of Neighborhood Density for Mobile Wireless Nodes -- MeshVision: An Adaptive Wireless Mesh Network Video Surveillance System -- SDEC: A P2P Semantic Distance Embedding Based on Virtual Coordinate System -- Dynamic Integration of Zigbee Devices into Residential Gateways for Ubiquitous Home Services -- Location-Based Services -- Fine-Grained Evaluation of Local Positioning Systems for Specific Target Applications -- Indoor Positioning System Using Beacon Devices for Practical Pedestrian Navigation on Mobile Phone -- NavTag: An Inter-Working Framework Based on Tags for Symbolic Location Coordinates for Smart Spaces -- Mobile Web 2.0-Oriented Five Senses Multimedia Technology with LBS-Based Intelligent Agent -- Security and Privacy -- Conflicting-Set-Based Wormhole Attack Resistant Localization in Wireless Sensor Networks -- Novel and Efficient Identity-Based Authenticated Key Agreement Protocols from Weil Pairings -- Implicit User Re-authentication for Mobile Devices -- Lattice Based Privacy Negotiation Rule Generation for Context-Aware Service -- Ubiquitous Intelligence -- Using RFID to Overcome Inventory Control Challenges: A Proof of Concept -- Anticipative Wrap-Around Inquiry Method towards Efficient RFID Tag Identification -- A Probabilistic Semantic Based Mixture Collaborative Filtering.

This book constitutes the proceedings of the 6th International Conference on Ubiquitous Intelligence and Computing, UIC 2009, held in Brisbane, Australia, during July 7-9, 2009. The 26 papers presented in this volume, together with the three invited papers, were carefully reviewed and selected from 92 submissions. The topics covered are context awareness, middleware and services, routing and sensor networks, ubiquitous networks and devices, location-based services, security and privacy and ubiquitous intelligence.