Toward an OSGi-Based Infrastructure for Context-Aware Applications
IEEE Pervasive Computing
Virtual Sensors: Abstracting Data from Physical Sensors
WOWMOM '06 Proceedings of the 2006 International Symposium on on World of Wireless, Mobile and Multimedia Networks
HESA: A Human-Centric Evolvable Situation-Awareness Model in Smart Homes
ICOST '08 Proceedings of the 6th international conference on Smart Homes and Health Telematics
An interactive cyber-physical system (CPS) for people with disability and frail elderly people
Proceedings of the 5th International Conference on Ubiquitous Information Management and Communication
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Service-oriented architecture (SOA) is a popular industry standard that provides an elegant model to create and compose interoperable applications. In the case of sensor networks, SOA is considered to be a very attractive enabler for sensor programmability and self-integration. However, SOA cannot be used without additional mechanisms to enhance the reliability and availability of the sensors behind the services. In the absence of such mechanisms, sensor-based SOA could provide a false promise of service whose, quality and availability are highly questionable and cannot be guaranteed. In this paper, we propose a Virtual Sensor framework for service-oriented sensor networks with the aim of enhancing reliability, prolonging availability and enabling automatic service composability. We classify and model three useful virtual sensor concepts and present compensation algorithms for coping with sensor failure. To quantify the merit of our approach, we developed a Data Quality Indicator measure for expressing the perceived quality of virtual sensor readings.