On the control of adaptation in ubiquitous computing
Proceedings of the 2008 ACM symposium on Applied computing
A semantic P2P framework for building context-aware applications in multiple smart spaces
EUC'07 Proceedings of the 2007 international conference on Embedded and ubiquitous computing
Expectation aware in-network context processing
Proceedings of the 4th ACM International Workshop on Context-Awareness for Self-Managing Systems
A logic based approach for context reasoning in assistive environment
Proceedings of the 2nd International Convention on Rehabilitation Engineering & Assistive Technology
Towards realizing global scalability in context-aware systems
LoCA'05 Proceedings of the First international conference on Location- and Context-Awareness
Context consistency management using ontology based model
EDBT'06 Proceedings of the 2006 international conference on Current Trends in Database Technology
MultiS: A Context-Server for Pervasive Computing
Electronic Notes in Theoretical Computer Science (ENTCS)
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The complexity of developing context-aware pervasive-computing applications calls for distributed software infrastructures that assist applications to collect, aggregate, and disseminate contextual data. In this dissertation, we present a Context Fusion Network (CFN), called Solar, which is built with a scalable and self-organized service overlay. Solar is flexible and allows applications to select distributed data sources and compose them with customized data-fusion operators into a directed acyclic information flow graph. Such a graph represents how an application computes high-level understandings of its execution context from low-level sensory data. To manage application-specified operators on a set of overlay nodes called Planets, Solar provides several unique services such as application-level multicast with policy-driven data reduction to handle buffer overflow, context-sensitive resource discovery to handle environment dynamics, and proactive monitoring and recovery to handle common failures. Experimental results show that these services perform well on a typical DHT based peer-to-peer routing substrate. In this dissertation, we also discuss experience, insights, and lessons learned from our quantitative analysis of the input sensors, a detailed case study of a Solar application, and development of other applications in different domains.