Snoop: an expressive event specification language for active databases
Data & Knowledge Engineering
Maintaining knowledge about temporal intervals
Communications of the ACM
Time synchronization in ad hoc networks
MobiHoc '01 Proceedings of the 2nd ACM international symposium on Mobile ad hoc networking & computing
Event Composition in Time-Dependent Distributed Systems
COOPIS '99 Proceedings of the Fourth IECIS International Conference on Cooperative Information Systems
RTAS '98 Proceedings of the Fourth IEEE Real-Time Technology and Applications Symposium
Causality and the spatial-temporal ordering in mobile systems
Mobile Networks and Applications
TinyLIME: Bridging Mobile and Sensor Networks through Middleware
PERCOM '05 Proceedings of the Third IEEE International Conference on Pervasive Computing and Communications
TAG: a Tiny AGgregation service for Ad-Hoc sensor networks
OSDI '02 Proceedings of the 5th symposium on Operating systems design and implementationCopyright restrictions prevent ACM from being able to make the PDFs for this conference available for downloading
Composite event detection as a generic middleware extension
IEEE Network: The Magazine of Global Internetworking
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A dramatic increase of event monitoring capabilities by wireless sensors requires new, more sophisticated, event correlation over time and space. This new paradigm implies composition of events in ubiquitous computing environments and event Correlation will be a multi-step operation from event sources to final subscribers, combining information collected by wireless devices into higher level information or knowledge. We define generic composite event semantics, which extend traditional event composition with data aggregation in wireless sensor networks (WSNs). This work bridges data aggregation in WSNs with event correlation services over distributed systems. We use interval-based semantics for event detection, defining precisely complex timing constraints.