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User/App Characterization

User/App Characterization. Ugur Cetintemel Guerney Hunt Ravi Jain Anupam Joshi Ryu Masuoka Jignesh Patel Jean Scholtz Ouri Wolfson Arkady Zaslavsky. Motivation. Cardinality of the actor set Dynamic/unpredictable nature of current context Scalability & performance

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User/App Characterization

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  1. User/App Characterization Ugur Cetintemel Guerney Hunt Ravi Jain Anupam Joshi Ryu Masuoka Jignesh Patel Jean Scholtz Ouri Wolfson Arkady Zaslavsky

  2. Motivation • Cardinality of the actor set • Dynamic/unpredictable nature of current context • Scalability & performance • Lack of support for semantics in current systems • Complexity of context dependencies

  3. Relationship between context, profile and actors • Name • Colour • Sport • … More control More static profile 1:n or 1:1 ??? actor • Location • Time • Tennis score • … less control less static • Human • Device • Software context

  4. Context • Context abstractions • Using context • Manipulating context information • Interpreting context • Detecting, sensing & discovering context

  5. System Adaptability • Adjustment of the system (actors + context + associations) to dynamic context • Reasons include minimizing cost, optimizing performance, etc • Internal & external adaptation • Monitoring • Reactivity & proactivity • Black box & feedback loop

  6. Priorities, open issues • Association between actors & context • Metacontext ??? Formalisms ??? • Inter- & intra- context dependencies • Storing, Retrieving, Accessing context info • Resource description & discovery • Context privacy & security • Scaling: zillions of actors, context attributes and associations • Minimizing human distraction • Composition, engineering and debugging of pervasive systems

  7. Links • Middleware, OMG • Software engineering , component SE • Telcos(Ericsson, Nokia, Motorola, Siemens) • Wireless networks • Hardware vendors • Operating systems • Software agents & AI • HCI • WWW, semantic web

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