Keynote -- Location Awareness: Potential Benefits and Risks -- Context Information Management and Distribution -- Context Modelling and Management in Ambient-Aware Pervasive Environments -- A Context Architecture for Service-Centric Systems -- Towards Realizing Global Scalability in Context-Aware Systems -- Positioning Sensor Systems I -- Towards LuxTrace: Using Solar Cells to Measure Distance Indoors -- Three Step Bluetooth Positioning -- MoteTrack: A Robust, Decentralized Approach to RF-Based Location Tracking -- Positioning Sensor Systems II -- Correcting GPS Readings from a Tracked Mobile Sensor -- Web-Enhanced GPS -- The COMPASS Location System -- The xPOI Concept -- Positioning Sensor Systems III -- The GETA Sandals: A Footprint Location Tracking System -- Improving the Accuracy of Ultrasound–Based Localisation Systems -- Position Estimation of Wireless Access Point Using Directional Antennas -- From Location to Context -- Exploiting Multiple Radii to Learn Significant Locations -- Modeling Cardinal Directional Relations Between Fuzzy Regions Based on Alpha-Morphology -- Commonsense Spatial Reasoning for Context–Aware Pervasive Systems -- Contextually Aware Information Delivery in Pervasive Computing Environments -- Bayesian Networks -- Classifying the Mobility of Users and the Popularity of Access Points -- Prediction of Indoor Movements Using Bayesian Networks -- Geo Referenced Dynamic Bayesian Networks for User Positioning on Mobile Systems -- Issues and Requirements for Bayesian Approaches in Context Aware Systems -- Context Inference -- Context-Aware Collaborative Filtering System: Predicting the User’s Preference in the Ubiquitous Computing Environment -- Mobile Context Inference Using Low-Cost Sensors -- Where am I: Recognizing On-body Positions of Wearable Sensors -- Privacy -- Context Obfuscation for Privacy via Ontological Descriptions -- Share the Secret: Enabling Location Privacy in Ubiquitous Environments -- Filtering Location-Based Information Using Visibility -- Location- and Context-Aware Applications -- Introducing Context-Aware Features into Everyday Mobile Applications -- Predicting Location-Dependent QoS for Wireless Networks -- Location-Based Services for Scientists in NRENs -- Hybrid Positioning and User Studies -- Towards Smart Surroundings: Enabling Techniques and Technologies for Localization -- Proximation: Location-Awareness Though Sensed Proximity and GSM Estimation.

This book constitutes the refereed proceedings of the First International Workshop on Location- and Context-Awareness, LoCA 2005, held in Oberpfaffenhofen, Germany in May 2005. The 26 revised full papers and 7 revised short papers presented were carefully reviewed and selected from 84 submissions. The papers are organized in topical sections on context information management and distribution, positioning sensor systems, from location to context, Bayesian networks, context inference, privacy, location- and context-aware applications, and hybrid positioning and user studies.