Agent-Based Design Model of Adaptive Distributed Systems
Applied Intelligence
"Take me with you!": a case study of context-aware application integrating cyber and physical spaces
Proceedings of the 2004 ACM symposium on Applied computing
Aware Technologies for Aging in Place: Understanding User Needs and Attitudes
IEEE Pervasive Computing
An adaptive middleware framework for context-aware applications
Personal and Ubiquitous Computing
The Contract Net Protocol: High-Level Communication and Control in a Distributed Problem Solver
IEEE Transactions on Computers
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This paper describes a scheme to increase the availability of context-aware services in ubiquitous computing environment by managing context information effectively where computational and network resources are insufficient. For the context-aware service, function of overall system and quality of service are also required to be maintained by circulating context information in adequate quality. This scheme manages the context information based on relationship between quality of context and quality of service. This scheme can avoid degradation of available network bandwidth and computational resource caused by circulation of excessive context information. From the initial experimental results using a prototype system of a ubiquitous live streaming video service, we confirm the available network bandwidth and computational resource. It is effectively maintained and recovered by controlling the update frequency of user's location information properly depending on the situation.