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Web documents can be clustered into topics with topic detection and tracking(TDT) technologies. With the topics' data collected by TDT system, it is found that the lifecycle of topics has 4 stages. In the paper a HMM-based state prediction model for topics is proposed. Some topics with similar lifecycles share a same model, several models are trained with history data of topics, these models are used...
Composite event processing systems are useful in various application domains such as stock data stream monitoring, RFID data management, web access pattern monitoring, etc. The tree-based method is a typical method for implementing composite event processing system. In this paper, we introduce an optimization method called "condensed composition" for the tree-based composite event processing...
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