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End date: 2009Subject: search.filters.subject.Self-organization

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    A formal approach for a self organizing protocol: Production System application
    (CERIST, 2009-10) Mellah, Hakima; Drias, Habiba; Hassas, Salima
    Any dysfunction in production system (PS) is likely to be very expensive; so modelling by Multi Agent Systems (MAS) makes the production system (PS) possible to have aspects of robustness, reactivity and flexibility, which allow the PS control to be powerful and to react to all the risks being able to occur. In order to have a fault-tolerant PS, we propose when and how to recourse to a self organizing protocol making the MAS capable of changing its communication structure or organization, and thus reorganizing itself without any external intervention.
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    SQUIRREL : Self-organizing Qos-roUting for IntRa-flow contention in ad-hoc wiRELess networks
    (CERIST, 2008) Derhab, Abdelouahid
    Due to the shared nature of the wireless medium, contention occurs among the nodes along a multi-hop path, which leads to intra-flow contention. In this paper, we use the selforganizing paradigms presented in [1] to design a new Qos-routing intra-flow contention-based protocol for wireless ad hoc networks, called SQUIRREL. The admission control component of SQUIRREL, called : Scalable and Accurate Admission control (SAICAC), has two variants : SAICAC-Power and SAICAC-CS. SAICAC-Power estimates channel bandwidth availability through high power transmissions and SAICAC-CS through passive monitoring of the channel. SQUIRREL can ensure all the properties of a self-organizing system contrary to the existing intra-flow contention-based protocols. Our analytical study demonstrates that SAICAC can achieve the best results in terms of message overhead, delay, and scalability.