1 / 25

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.

miya
Télécharger la présentation

Modeling and Using Context in Adapting Applications to Pervasive Environments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related