Some contributions to the management of data in grids



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Some contributions to the management of data in grids






Grid access control: Sygn







Data integration



Some contributions to Pervasive/Ubiquitous Systems



PerSE



Architecture of a PerSE Base



PerSE Layers



Context modeling and Context-aware pervasive applications



Chains of trust certificates: if A trusts B and B trusts C then A trusts C… to some level

  • Chains of trust certificates: if A trusts B and B trusts C then A trusts C… to some level

  • Multi-layered adaptive certificates

  • Trust computing and reputation



Authentication and Trust in pervasive systems



Mobile requests

  • Information exchange between mobile peers (MANETs, VANETs)

  • Trajectory aware geocast request routing

  • Construction for each query of an ad hoc overlay of the peers that may participate to the delivery of the requested data



Data replication in small worlds



Replication in ad hoc networks

  • Issues: instability, dynamicity, faults/disconnections

  • Basic idea: adapt the replication heuristics to the actual usage of the data, e.g.:

  • Pre-requisite: access logging + exchange of access data

  • Assumption: no central coordination – local decisions

  • Question : can local decisions lead to an acceptable (good ?) situation ?





Multimedia Content Adaptation



Semantic protection of multimedia data

  • Multimedia => access control is not a binary decision

  • Access control <=> content adaptation

  • Coherence/Consistence of an adaptation

  • Legality of an adaptation

  • => Access control = semantic adaptation decision



Semantic clustering of multimedia queries: From query logging to database content and user profile discovery

  • Large number of data stores disseminated

  • Lack of indexes

  • Issues :

    • What are the pertinent/interesting data ?
    • What are the users interest ?
    • How to process a query ?
  • Logging of the users’ queries + clustering + communication of clustering info => identification of the community of users’ interests

  • Logging of a the queries issued by a specific user + matching to the community clustering => identification of the user’s profile

  • Usage: query optimization, data store management, recommendation, social computing, etc.




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