Browsing by Author "KHALFI Mohammed Fethi"

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    Une approche instrumentée pour la mise en œuvre des Systèmes D’informations Pervasifs
    (2015-02-25) KHALFI Mohammed Fethi; Encadreur: Sidi Mohamed BENSLIMANE
    Résumé (Français et/ou Anglais) : The recent technological overhangs have focused on the democratization of wireless networks and the miniaturization of communication devices. In this context, Ubiquitous Computing is a recent paradigm whose objective is to allow users to access data, and make information available anywhere and at any time. In other terms, Pervasive Information Systems (PIS) constitute an emerging class of Information Systems where Information Technology is gradually embedded in the physical environment, capable of accommodating user needs and wants when desired. PIS differ from Desktop Information Systems (DIS) in that they encompass a complex, dynamic environment composed of multiple artefacts instead of Personal Computers only, capable of perceiving contextual information instead of simple user input, and supporting mobility instead of stationary services. First, as an initial step, we present PIS novel characteristics compared to traditional desktop information systems ; we explore this domain by offering a list of challenges and concepts of ubiquitous computing that form the core elements of a pervasive environment. As a result of this work, a generic architecture for intelligent environment has been created. Based on various and related works concerning models and designs. This framework can be used to design any PIS instance. Second, Context awareness is the core feature of pervasive computing. High-level context awareness can be enhanced by situation awareness that represents the ability to detect and reason about the real-life situations. In order to deal with the problem in context-aware modeling in pervasive computing environments, we present a comprehensive and integrated approach for context modeling. We first propose a Meta model context based on ontology for Pervasive Computing aiming to extend its capabilities by adding new environmental aspects. The advantage is that it can provide a flexible modeling mechanism for multiple applications of context-aware pervasive computing. Finally, Pervasive environments are characterized by rich and dynamic context, where users need to be continuously informed about services relevant to their current context. We will present an enhancement of ubiquitous computing discovery mechanisms adding context handling capabilities to Web Services for Devices in Pervasive Computing using UPnP as an infrastructure to address these implicit requests. Our method uses location aware, UPnP infrastructure, web service for devices and the notion of proactivity in pervasive computing to continuously present the most relevant services to the user or device in response to changes of context, services or user preferences.