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Recent advances in computer technology and wireless communications have enabled the emergence of stream-based sensor networks. Broad applications include network traffic monitoring, real-time financial data analysis, environmental sensing, large-scale reconnaissance, surveillance, etc. In these applications, real-time data are generated by a large number of distributed sources, such as sensors, and must be processed, filtered, interpreted or aggregated in order to provide useful services to users. The sensors, together with many other shared resources, such as Internet hosts and edge servers, are organized into a network that collectively provides a rich set of query processing services. Resource-efficient data management is a key challenge in such stream-based sensor networks.
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