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Modeling and Using Context in Adapting Applications to Pervasive Environments

Modeling and Using Context in Adapting Applications to Pervasive Environments. Tarak Chaari, Dejene Ejigu, Frédérique Laforest and Vasile-Marian Scuturici. OUTLINE. Introduction The scope of this paper Context Modeling Adaptation strategy to context Implementation Conclusions.

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Modeling and Using Context in Adapting Applications to Pervasive Environments

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  1. Modeling and Using Context in Adapting Applications to Pervasive Environments Tarak Chaari, Dejene Ejigu, Frédérique Laforest and Vasile-Marian Scuturici INSA Lyon

  2. OUTLINE • Introduction • The scope of this paper • Context Modeling • Adaptation strategy to context • Implementation • Conclusions ICPS 2006

  3. What is context? • Fuzzy and general word • Where are we? What we are doing? … • 1996, Brown’s definition • Location, identity, application and time • 2001, Dey’s definition • Any information characterizing an entity • An entity is a person, a location, an object… • The most general and adopted definition • Too vague and it does not help modelling the context ICPS 2006

  4. context definition and properties • Definition: context is the set of external parameters that can modify the behaviour of an application by defining new views on its data and services • Wingorad: something is context because of the way it is used in interpretation, not due to its inherent properties • Example: GPS coordinates in a healthcare application / in traffic regulation application • Context parameters are transparent to the user • New instance = new contextual situation • These precisions help adding context – awareness to non adapted application ICPS 2006

  5. Context – Awareness • Definition • The ability of acquiring context knowledge • adaptation to the context change • Requirements • Capture • Interpret • Store/Disseminate • Adapt ICPS 2006

  6. Motivations • Existing solutions • specific to particular concerns • a lot of interest on how to capture context • Lack of a comprehensive context model • formality • expressiveness • Lack of a concrete approach to adapt applications to context • generic adaptation strategy • dynamic adaptation ICPS 2006

  7. OUTLINE • Introduction • The scope of this paper • Context Modeling • Adaptation strategy to context • Implementation • Conclusions ICPS 2006

  8. SECAS Project • Simple Environment for Context – Aware Systems • Generic and comprehensive platform • Creating new context-aware applications • Adapting existing legacy applications to new contexts ICPS 2006

  9. SECAS Architecture ICPS 2006

  10. OUTLINE • Introduction • The scope of this paper • Context Modeling • Adaptation strategy to context • Implementation • Conclusions ICPS 2006

  11. Context Modeling • Context = (Subject, Predicate, Value, Time, Certainty) • Example= (Bob, isLocatedIn, room305, Fri-23-jun-2006-12:00:00-GMT, 0.85) • Intelligence and semantics processing • (VideoService, runsOn, PDA-01) • (PDA-02, runs, VideoService) • (realPlayer, runsOn, laptop-01)  devices that can run Video Services ICPS 2006

  12. Ontology for context modeling ICPS 2006

  13. Example of a context ontology ICPS 2006

  14. OUTLINE • Introduction • The scope of this paper • Context Modeling • Adaptation strategy to context • Implementation • Conclusions ICPS 2006

  15. Application’s Functional Model • Functional Model = application services description + services dependences • XML deployment descriptor (extension of pnml) ICPS 2006

  16. Service Adaptation strategy ICPS 2006

  17. Service adaptation entity • Adapter (proxy) ICPS 2006

  18. Service adaptation rules • Pairs (context situation, adaptation action) • Context situation = Logical expressions of context predicates • Adaptation action = a list of adaptation operators • Operators on the functional model • Operators on the inputs and outputs of services • Operators on service versions • Example ICPS 2006

  19. OUTLINE • Introduction • The scope of this work • Context Modeling • Adaptation strategy to context • Implementation • Conclusions ICPS 2006

  20. SECAS Administration User Interface ICPS 2006

  21. Context1: Doctor1 using SICOM on a standard PC ICPS 2006

  22. Context2: Doctor1 using SICOM on a smartPhone E1 E2 E3 E4 E5 E6 E’6 ICPS 2006

  23. OUTLINE • Introduction • The scope of this paper • Context Modeling • Adaptation strategy to context • Implementation • Conclusions ICPS 2006

  24. Conclusions • A comprehensive Context model based on ontology representation • An extensible adaptation platform to: • create context – aware applications • adapt existing applications to context • Platform under development • Services adaptation module completed and validated • Content adaptation module • User interface adaptation module ICPS 2006

  25. Question time ! ? ICPS 2006

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