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Name
DI-fusion
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18305 Publications
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  • Resource allocation for cooperative cognitive radios

    Resource allocation consists in allocating spectrum and power on every link of a network, possibly under power and rate requirements. In the context of cognitive radios, almost 15 years of research produced an impressive amount of theoretical contributions, exploring a wide range of possibilities. However, despite the ever-growing list of imaginable scenarios, we observe in Chapter 2 that most of these studies are based on similar working hypotheses. Our first contribution is to challenge som...

    Cretan defences: urban fortifications and defence of territory in Crete during the Classical and Hellenistic periods

    Le but de cette étude est de présenter un tableau des questions de défense en Crète aux époques classique et hellénistique. La cité grecque étant une entité double, la défense de la ville n’a pas été séparée de celle de son territoire.Le point de départ de ce travail est le catalogue des fortifications crétoises, qui comprend 61 sites fortifiés (enceintes urbaines, forts et tours isolées).À partir d’une étude qui fait une grande place aux questions de topographie, il a été possible d’une part...

    Agrégation de relations valuées par la méthode de Borda, en vue d'un rangement. Considérations axiomatiques

    Depuis 20 à 30 ans, l'aide multicritère à la décision est apparue. L'expansion de cette nouvelle discipline s'est marquée dans la littérature essentiellement par un foisonnement de nouvelles méthodes multicritères d'aide à la décision et par des applications de celles-ci à des problèmes "réels". Pour la plupart de ces méthodes, il n'y pas ou peu de fondements théoriques. Seul le bon sens a guidé les créateurs de ces méthodes.Depuis une dizaine d'années, le besoin de bases théoriques solides s...

    Experimental investigation of cavitation in a safety relief valve using water: extension to cryogenic fluids

    This thesis addresses the experimental investigation of the cavitation phenomenon and its main consequences on the normal operation of a safety relief valve (SRV). More particularly, limitation of the mass flux discharged and alteration of the hydraulic fluid forces behavior is of main interest for the proper design and sizing of such devices. In nuclear or thermal engineering systems, the use of SRVs is mandatory since it represents the ultimate protection device before an accident occurs, c...

    The Fixpoint checking problem: an abstraction refinement perspective

    Model-checking is an automated technique which aims at verifying properties of computer systems. A model-checker is fed with a model of the system (which capture all its possible behaviors) and a property to verify on this model. Both are given by a convenient mathematical formalism like, for instance, a transition system for the model and a temporal logic formula for the property.For several reasons (the model-checking is undecidable for this class of model or the model-checking needs too mu...
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