单元和双元事件上的时间算子研究

dvanced applications of sensors, network traffic, and financial markets have produced massive, continuous, and time-ordered data streams, calling for event detection techniques. Beyond the widely adopted sequence operator in current data stream management systems, as well as inspired by the great work developed in temporal logic and active database fields, this paper presents a rich set of temporal operators on events, with an emphasis on the temporal properties and relative temporal relationships of events.We outline three temporal operators on unary events (Within and Last), together with four ones on binary events (Concur; Sequence (as a comma behind), and Overlap). These operators are rich enough to describe temporalproperties and relative temporal relationships of events.