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The goal of our research is to develop a smart context-aware self guided tour assistant as a contextaware real world application. As a context-aware tourist guide application, we have been developing a PDA-based location-aware tourist guide application for the old palace Deoksugung in the center of Seoul. It will guide visitors to the palace with informationabout: current location, attractions nearby, and details about specific buildings. Rich multimedia support has been incorporated into the system to provide extra features to enhance the self-guided tour.

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Abstract. Most static analysis techniques for optimizing stack inspection approximate permission sets such as granted permissions and denied permissions. Because they compute permission sets following control flow, they usually take intra-procedural control flow into consideration as well as call relationship. In this paper, we observed that it is necessary for more precise optimization on stack inspection to compute more specific information on checks instead of permissions. We propose a backward static analysis based on simple call graph to approximate redundant permission checks which must fail. In a similar way, we also propose a backward static analysis to approximate success permission checks, which must pass stack inspection.