情境感知系统设计与应用.ppt

谢谢大家！ * /US/en/corp/georgeFisher/dCarpAdp2000.shtml Who is that person sitting next to Uncle Ralph? Where on earth was that picture taken? Was this a photo from my second wedding? Or my third? * /US/en/corp/georgeFisher/dCarpAdp2000.shtml Who is that person sitting next to Uncle Ralph? Where on earth was that picture taken? Was this a photo from my second wedding? Or my third? * /US/en/corp/georgeFisher/dCarpAdp2000.shtml Who is that person sitting next to Uncle Ralph? Where on earth was that picture taken? Was this a photo from my second wedding? Or my third? * /US/en/corp/georgeFisher/dCarpAdp2000.shtml Who is that person sitting next to Uncle Ralph? Where on earth was that picture taken? Was this a photo from my second wedding? Or my third? * Forget-me-not system * The most often created context-aware application Measurement Categorization Continuous Context Enumerative Context State Context Descriptive Context Continuous context function of current value of the context component, lowest threshold value highest threshold value compare value the metric of the value Enumerative Context a set of discrete values and defined in a list or set. They are based on set operations. State Context consists of two opposite values and they toggle between them. state context component η, val (η)∈H, H={0,1} calculated in predicate calculus. Descriptive Context based on the description statement of the context and for this purpose it uses predicate calculus. For example; location (CellPhone, loc_A) location(laptop, loc_B) location (obj1, loc1) ^ location (obj2, loc2) ^ (loc1^ loc ) ^ (loc2 ^ loc) =near(obj1,obj2) modeling of contextual information The context modeling is highly important to capture: user requirements/profile, application requirements, device capabilities relationship between context methods: Razzaque: context awareness1\modeling of quality.pdf Set theory Directed Graph First-order Logic Preferences and user’s Profiles (CC/PP and