Recently, as the popularization of the smartphone and rapid development of the mobile sensor technology, more and more researchers are paying close attention to the context sharing system based on mobile devices. In the mobile context sharing system, users can check others'shared context in real-time. Moreover, with the mobile sensors, the system can collect various context information. An advanced context sharing system should provide not only context sharing but context awareness. This paper

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... resents a novel mobile context sharing system which can recognize user's activity and location automatically. In the proposed system, we use decision tree and Bayesian network to recognize user's activity and use rule-based method to recognize user's location. The system also can detect communities based on KeyGraph and Bluetooth sensor.