Monitoring and control of distributed systems
ISCI '90 Proceedings of the first international conference on systems integration on Systems integration '90
Time, clocks, and the ordering of events in a distributed system
Communications of the ACM
Wireless sensor networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
The many faces of publish/subscribe
ACM Computing Surveys (CSUR)
MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
Determination of Time and Order for Event-Based Middleware in Mobile Peer-to-Peer Environments
PERCOMW '05 Proceedings of the Third IEEE International Conference on Pervasive Computing and Communications Workshops
A low latency and energy aware event ordering algorithm for wireless actor and sensor networks
MSWiM '05 Proceedings of the 8th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
9th International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems 2006
Proactive context-aware sensor networks
EWSN'06 Proceedings of the Third European conference on Wireless Sensor Networks
Temporal Event Ordering with Fault Tolerance for Wireless Sensor and Actuator Networks
Wireless Personal Communications: An International Journal
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This paper presents a wireless sensor and actor network (WSAN) that can interpret from simple to complex contexts. In our solution, actors are used to aggregate sensor events, eliminate ambiguities and redundancy and realize context interpretations. Each actor of the WSAN is configured with rules that are determined by the application in the network configuration phase. An energy-aware event-ordering algorithm is also presented and evaluated against other existing solutions. After ordered, correlated events are interpreted resulting in contexts that go from simple questions, such as ''what is the temperature of sector A'' to more complex ones ''why did the aircraft wing crack''. Context information is exchanged among actors and sink(s) of the WSAN through the publish/subscribe technique based on topics. Results from simulations have shown that by having actors for context interpretation and a fast energy-aware event-ordering algorithm, our solution can be a good alternative for emergency preparedness applications where lives and patrimony are at risk.