WorldCat Identities

Université du Sud Toulon-Var UFR de Sciences et Techniques

Overview
Works: 221 works in 351 publications in 1 language and 355 library holdings
Roles: Other, Degree grantor, 985, Thesis advisor
Publication Timeline
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Most widely held works by Université du Sud Toulon-Var
Fusion de bases de croyances et programmation logique avec sémantique des modèles stables by Julien Hué( Book )

2 editions published in 2009 in French and held by 3 WorldCat member libraries worldwide

Representation of knowledge is a central aspect in artificial intelligence. Decisions of an intelligent agent must rely on informations which represent the world as correctly as possible. This difficulty to have a correct representation of the world is particularly important when dealing with a changing world of information from multiple sources. In this thesis, we propose a method to perform syntactic merging in the case where no explicit priorities are expressed. This method, called Removed Sets Fusion (or RSF), is based on the search of subsets of formulas to remove to restore consistency. We performed an implementation of this method based on the translation of the fusion problem into a logic program with stable model semantics. We propose two different implementations: an adaptation of the smodels algorithm and another implementation based on the additional statements provided by Lparse/Gringo. We tested this last implementation: thanks to randomly generated belief profile and, in a second time thanks to the data from archeological survey coming from the European project VENUS. We then extended the Removed Sets Fusion in two directions. We study merging in the case where priorities are expressed between agents or between agents and beliefs. We also study the case were beliefs are expressed in terms of logic programs
Etude du mistral en zone côtière : approches théoriques et observationnelles appliquées aux campagnes MAP et ESCOMPTE by Vincent Guenard( Book )

2 editions published between 2004 and 2007 in French and held by 3 WorldCat member libraries worldwide

The vertical structure of the coastal mistral has been investigated in the context of the MAP (autumn 1999) and ESCOMPTE summer 2001) field campaigns. The study combines the observational (through the exploitation of the multi-platform data avalaible in both experiments), the theoretical (using the basic existing theories dealing with orographic flows) and the numerical (using the non-hydrostatic atmospheric model RAMS) approaches to point out the physical processes involved in mistral episodes.Upstream blocking, channelling, splitting, wave breakings, lee wakes, downslope and frictional effects result in a deep or a shallow structure according to the direction of the incident flow in strong mistral events. The daily weak mistral is lifted up above the atmospheric boundary layer by convection and sea breezes while the nighttime weak mistral is accelerated by land breezes as a nocturnal low-level jet
Étude expérimentale et numérique de la propagation d'ondes de gravité en zone de déferlement by Déborah Drevard( Book )

3 editions published in 2006 in French and held by 3 WorldCat member libraries worldwide

The purpose of this work consists in studying experimentally and numerically the propagation and the breaking of gravity waves. In the first part, calculations, based on Stokes wave theory, are proposed for the measurement of partially standing wave from electromagnetic (S4) or acoustic (ADV) instruments giving velocities and/or pressure synchronous measurements. Influences of current, wave propagation direction, immersion depth of instrument and nonlinear effects are then studied for both laboratory and nearshore experiments. In the second part, an improved interface tracking algorithm (SL-VOF, Semi-Lagrangian Volume Of Fluid), inserted in an industrial code (EOLE, Principia R&D) is validated for gravity wave breaking in shallow water. Two applications are considered for the study of the shoaling and the breaking of a solitary wave: over a step (discontinuity of the bottom) and over a constant mild slope (1/15)
Fusion de connaissances : applications aux relevés photogrammétriques de fouilles archéologiques sous-marines by Julien Seinturier( Book )

2 editions published in 2007 in French and held by 3 WorldCat member libraries worldwide

This work propose a study of the knowledge fusion and its applications in the survey of underwater archaeological excavations. Our framework is the knowledge based measure, which can be represented by a synthesis between theoretical models designed by specific domain experts and set of observations performed on surveyed objects. During the study of an archaeological site, surveys can be made by different operators and at different times. This multiplication of observations can lead lo inconsistencies during the aggregation of the partial results. The building of a final result requires a fusion process piloted by the leader of the study. Such process must be automated while leaving to the operator the choice of the methods used to ensure the final consistency. This work is divided into three parts: a theoretical study of the known methods for knowledge fusion, the implementation of fusion methods as part of the knowledge based measurement and experimentation of proposed solutions during surveys in full-scale applications. In the first part, we present a theoretical study of known belief fusion methods and we propose a new framework allowing to express these methods at a semantic and syntactic level while adding it a reversibility. This framework is based on polynomials weights that allow to represent priorities between believes and history of the changes of these priorities. In the second pan. we present knowledge based measurement by representing a formalism of representation based on entity notion. We propose then adapted technics of fusion in the new representation. These technics are based on first order logic. Algorithms effusion are proposed and studied. In the last part, we introduce experimentation of techniques of proposed fusion methods. We offer a description of the developed tools used as pan of plan European VENUS (http://www.venus-project.eu) but also their extensions to building archaeology and in underwater biology
Détection et localisation de particules de très hautes énergies en acoustique sous-marine by Nicolas Juennard( Book )

2 editions published in 2007 in French and held by 3 WorldCat member libraries worldwide

Le sujet de cette thèse s'inscrit dans le cadre du projet international Antares dont l'objectif est la construction d'un télescope à neutrino situé dans un environnement marin au large de Toulon. A de fortes profondeurs, un neutrino a d'autant plus de chance de rentrer en collision avec une molécule d'eau, générant ainsi une réaction en chaîne générant un flash lumineux et une onde sonore. L'objectif de cette thèse est d'étudier cette onde sonore en vue de développer un système capable de détecter le front d'onde correspondant et d'estimer la direction originelle du neutrino. Dans un premier temps, l'étude se porte sur le signal acoustique. Deux descriptions issues de la littérature et de récents travaux effectués au CPPM sont confrontées et aboutissent à une modélisation mathématique du signal et du front d'onde. Dans un second temps, plusieurs méthodes de détection sont étudiées, de la plus classique (étude du rapport de vraisemblance) à des méthodes plus récente (filtrage adapté, classification, etc.). La comparaison expérimentale en situation semi-réelle de celles-ci aboutit au choix de la méthode de détection suivante : le FASE (Filtrage Adapté Stochastique Etendu). Enfin, la position et la direction du neutrino sont estimés par un algorithme dérivé de Gauss-Newton, Cet estimateur se base sur la modélisation du déplacement du front d'onde acoustique et sur les informations temporelles de détection fournies par les hydrophones du télescope. De nombreuses configurations sont testées et les performances du système sont évaluées. Une structure d'hydrophone est proposée et une simulation dite « globale » finalisent cette thèse. Dans celle-ci, les étapes de détection et d'estimation sont basées sur les résultats obtenus précédemment. Les bruits de mer sont des bruits réels issus de campagnes de mesure et les résultats obtenus valident les travaux de cette thèse
Contribution à l'étude de la mobilité des métaux lourds contenus dans les résidus d'incinération des déchets ménagers, sur le moyen et long terme by Laurence Montigny( Book )

2 editions published in 2000 in French and held by 3 WorldCat member libraries worldwide

L'incinération des ordures ménagères produit 27% de mâchefers, 3% de REF10M (Résidus d'Epuration des fumées d'Incinération d'Ordures Ménagères) et 70% de fumées. L'évolution de la gestion et des réglementations pose le problème de la prédiction du comportement à long terme de ces résidus. Il a donc semblé intéressant de mettre au point des méthodes d'extraction susceptibles d'accélérer les processus d'altération et d'appréhender le comportement à long terme de ces résidus dans le milieu naturel. La percolation d'une part et le dispositif soxhlet d'autre part ont été utilisés. A l'aide de ces deux tests, un comportement quasi similaire pour l'ensemble des résidus d'incinération étudiés a pu être mis en évidence. Ces derniers présentent tout d'abord le même comportement pour la mise en solution des majeurs. On a ainsi la solubilisation congruente de composés très solubles comme les composés chlorurés (NaCl, K.C1, et CaCl3) et la dissolution de composés peu solubles comme CaSO, et Ca(OH)i. Par la suite si les éléments comme le potassium, le sodium et le chlorure sont très peu voire plus du tout lessivés, en revanche le calcium e: le sulfate le sont encore dans une moindre mesure mais de façon régulière. Par ailleurs la dissolution de ces composés est accompagnée de celles des métaux. La quantité de métaux solubilisés lors des premiers litres percolés est relativement importante, par rapport au total extrait sur l'ensemble de l'expérience. Par la suite ces métaux sont soit plus du tout ou soit peu mobilisés. La principale différence entre les divers résidus est la quantité d'éléments relargués. Cependant pour l'ensemble des résidus moins de 10% des métaux sont mobilisés au cours de ces différents tests. Cela indique que la plupart d'entre eux sont sous des formes très peu solubles dans l'eau. Une modélisation rapide, a permis de constater que la première étape de solubilisation aurait lieu les premières années de stockage. La deuxième s'échelonne, quant à elle, sur deux à trois cents ans.Par ailleurs du carbone organique est également mobilisé. L'utilisation de matrices d' excitatioa/émission de fluorescence (MEEF) s'est révélée être une méthode sensible pour la caractérisation de différents types de fluorophores solubilisés lors de ces tests
Approche extraction de connaissance de l'analyse de données astronomiques : application à l'identification croisée multi-[lambda] by Bruno Voisin( Book )

2 editions published in 2002 in French and held by 3 WorldCat member libraries worldwide

Influence des hydrométéores sur la propagation des ondes électromagnétiques dans la bande 30-100 GHz : études théoriques et statistiques by Olivier Veyrunes( Book )

2 editions published in 2000 in French and held by 2 WorldCat member libraries worldwide

The growing request for new communication networks rises an increasing interest in short path wireless systems at very high rate. The congestion of the radioelectrical spectrum induces the designer of such high frequency communications systems to consider higher and higher frequencies reaching the millimetre wavelength regions of the electromagnetic spectrum. At such frequencies, precipitation of hydrometers (rain, snow and hail) is the cause of important perturbation in the point of view of the propagation. The experimental set-up by the CNET has for purpose to measure simultaneously, over an 800 meters path in visibility, the radioelectrical field variations at 30, 50, 60 and 94 GHz and the meteorological conditions. The purpose of this thesis, which is to investigate the experimental database, is twofold : (i) to well understand the interactions between electromagnetic waves and various atmospheric and meteorological phenomena and (ii) to develop prediction propagation models required by system designers in order to offer reliable transmission support for future wide band services
Contre-exemples dans l'approximation q-convexe et q-coconvexe by Lyudmyla Yushchenko( Book )

2 editions published in 2002 in French and held by 2 WorldCat member libraries worldwide

Apport de la microscopie électronique en transmission à l'étude des mémoires non volatiles de nouvelle génération by Antoine Demolliens( Book )

2 editions published in 2009 in French and held by 2 WorldCat member libraries worldwide

Microelectronic recent developments impose ton increase the speed and integration density of embedded memories. However, getting reliable products first require developing production process, understanding reliability issues, and managing physical analysis of defects. Thus, the work done during this thesis concerns the failure analysis and physical characterisation of non volatile memories by transmission electron microscopy (TEM). Four research subjects have been studied. The first one applied to microstructure degradation of advanced EEPROM cell, produced at STMicroelectronics, after electrical and thermal solicitations. Then, a new charge based storage quasi non volatile architecture called SQeRAM, actually under investigation at STMicroelctronics, was characterised by TEM, in order to get the microstructure of charge storage areas and understand the physical origin of poor retention performances of these devices. Thirdly, a collaboration with the start up Crocus Technology gave us the opportunity to participate to the process development of a new generation of thermally assisted writing magnetoresistive memory (TA-MRAM). Here, different complex magnetic stacks constituting the memorisation element of these devices have been characterised. Finally, the last addressed research axe concerned a new generation of non volatile macromolecular resistance switching memory based on the organo-metallic complex CuTCNQ. In this case, CuTCNQ microstructure and growth in small via interconnections was studied, for different synthesis methods developed by IMEC and Aachen Technical University
Contribution à l'analyse et à la commande avancée des systèmes multivariables by Amine Trabelsi( Book )

2 editions published in 2006 in French and held by 2 WorldCat member libraries worldwide

This thesis treats the modeling and the adaptive optimal control of complex systems using the concepts of the fuzzy logic and the neural networks. The accent is put on the class of the dynamic, nonlinear, stochastic and multivariables systems. In this context, we proposed a modeling method of these systems based on the fuzzy clusterine technique. In fact, from an available data base of the system to study, a global fuzzy control model, formed by the weighted set of fuzzy local linear models of Takagi-Sugeno type, is established. The fuzzy model parameters are then adapted by the recursive (east squares algorithm with forgetting factor. The proposed control method is of optimal type by quadratic criteria. It Is based on a neuronal simulation model and a fuzzy Taftagi-Sugeno control moxtel. The resulting error between the outputs of these two models will serve to adapt the fuzzy model's parameters, and therefore the controller's parameters. This method has been applied with success for the control of the air temperature and the humidity inside of an agricultural greenhouse
Etude d'un système PUVW pour des mesures de houle et de turbulence en milieu littoral côtier by Anne Meuret( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

Stabilité des systèmes dynamiques chaotiques et variétés singulières by Jean-Marc Ginoux( Book )

2 editions published in 2005 in French and held by 2 WorldCat member libraries worldwide

Ce mémoire a pour objectif d'étudier la stabilité de systèmes dynamiques chaotiques à partir de la structure géométrique de leurs attracteurs dont une partie s'appuie sur une variété appelée variété lente. Dans ce but, une nouvelle approche basée sur certains aspects du formalisme de la Mécanique du Point et de la Géométrie Différentielle a été développée et a conduit à une interprétation géométrique et cinématique de l'évolution des courbes trajectoires, intégrales de ces systèmes dynamiques au voisinage de la variété lente. L'utilisation du formalisme de la Mécanique du Point a permis, grâce à l'emploi des vecteurs, vitesse et accélération instantanées attachées à un point courant de la courbe trajectoire, de discriminer le domaine lent du domaine rapide et de situer la position de la variété lente à l'intérieur de l'espace des phases. Certaines notions de Géométrie Différentielle, comme la courbure, la torsion et le plan osculateur, ont fourni une équation analytique de la variété lente indépendante des vecteurs propres lents du système linéaire tangent, donc définie sur un plus grand domaine de l'espace des phases. La variété lente a alors été envisagée comme le lieu des points où la courbure des courbes trajectoires, intégrales de ces systèmes dynamiques, est minimum (en dimension deux ce minimum devient égal à zéro). Le signe de la torsion a permis, de caractériser son attractivité et, de discriminer la partie attractive de la partie répulsive de la variété lente et de statuer sur la stabilité de ces courbes trajectoires. Ainsi, la présence dans l'espace des phases d'une variété lente attractive qui contraint les courbes trajectoires, intégrales du système dynamique à visiter son voisinage permet d'étudier la structure de l'attracteur. Cette approche basée sur certains aspects du formalisme de la Mécanique du Point et de la Géométrie Différentielle et qui s'est accompagnée de l'élaboration de programmes numériques a permis de constituer un nouvel outil d'investigation des systèmes dynamiques chaotiques. Son application à des modèles de référence comme celui de B. Van der Pol, de L.O. Chua ou d'E.N. Lorenz a permis d'obtenir plus directement et avec précision l'équation analytique de leur variété lente. De plus, une étude détaillée des modèles de type prédateur-proie comme celui de Rosenzweig-MacArthur ou d'Hastings-Powell, a conduit d'une part à la détermination de leur variété lente et d'autre part à la conception d'un nouveau modèle de type prédateur-proie à trois espèces appelé Volterra-Gause dont l'attracteur chaotique a la forme d'un escargot (chaotic snail shell)
Matériaux monochromes nanotexturés à base de dioxyde de vanadium : application à la discrétion infrarouge by Frédéric Guinneton( Book )

2 editions published in 2001 in French and held by 2 WorldCat member libraries worldwide

Deux approches de l'inversion geoacoutisque : inversion par signaux large bande et approche variationnelle by Jean-Claude Le Gac( Book )

2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide

Seafloor geoacoustic properties are essential in underwater acoustics. This is particularly true for very low frequencies and shallow water environments. A geoacoustic model that is able to predict the sound propagation in an underwater environment is needed in order to optimize predictions of sonar performances. The methods for elaborating the geoacoustical models we present are based on the inversion of acoustical data. They aim to elaborate models adapted to sonars (through-the-sensor approach) by making use of instrumental configurations that are close to those of sonars. The geoacoustical models thus obtained are acoustically equivalent to ground truth models. The first approach exploits an estimation of the impulse response of the acoustical channel coming from the adapted filtering of broadband signals emitted by a source and received by a single hydrophone. This leads to a two-step method that first refine the knowledge of the geometrical parameters and then compute the seafloor plane wave reflection coefficient. The validity of the model thus obtained is examined and the technique applied to a real data set. The second approach is based on a variational approach coming from control theory. In this case, the acoustical pressure field is controlled by an impedance control function that is the geoacoustic model. The method is based on the formulation of the adjoint model of a parabolic approximation of Helmholtz's equation. The gradient of the cost functions defined in the algorithm is computed exactly. Local and non-local boundary conditions are examined. This method is potentially very promising
Synthèse et étude des propriétés thermiques de nouveaux bismaleimides cristaux liquides by Marie-Pierre Gelin( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

Le sujet de cette thèse porte sur la réalisation et l'étude des propriétés de bismaléimides originaux comportant un groupe mésogène et un espaceur souple. Les monomères synthétisés présentent une structure moléculaire symétrique qui comporte un groupe mésogène de type phénylbenzoate ou amide aromatique et une structure souple de type polyméthylénique, polyoxyéthylénique ou organofluoré. Les groupements souples sont reliés aux groupements mésogènes par des jonctions de type éther ou ester.Une étude des propriétés thermiques et de la réticulation de ces composés dans l'état cristal liquide a été effectuée. Ces nouveaux matériaux, présentent, en fonction de la structure, des températures de transition vitreuse intéressantes. Avec les amides aromatiques, ces températures sont supérieures à 300°C. Les corrélations structures-propriétés thermiques ont été précisées. Ces corrélations ouvrent des perspectives de développement intéressantes dans le domaine des résines thermodurcissables
Synthèse et étude de bismaléimides à groupement mésogène amide-ester aromatique et groupement souple polyméthylénique. Application au collage structural by Quang Trung Pham( Book )

2 editions published in 2010 in French and held by 2 WorldCat member libraries worldwide

These works are in the field of Liquid Crystal Thermosets. The molecules allow obtaining new materials that attire many intentions of the scientists thanks to theirs theoretical interests and high potential developments. We have successfully synthesized four Bismaleimide Liquid crystals (BMI CL) in the laboratory. These novel molecules have a flexible group of polymethylene with variable length at the centre and two symmetrical mesogenic groups in the both sides of the molecule. After an investigation of their solubility, we have developed a new specific method for purification of the product. After the purification, these BMI CL compounds were characterized by NMR (1H and 13C) and FT-IR techniques. Theirs thermal and mesomorphic properties were studied by DSC,TGA, X-Ray diffraction and polarized light microscopy. The BMI CL compounds exhibit the excellent thermal properties as high melting temperatures (T<200°C) and elevated thermal oxidation temperatures (Td>410°C). The correlations between the molecular structures and theirs physique chemical properties have been demonstrated in this work. In fact, the parity of the flexible group of polymethylene in the molecule reveals a key effect on the solubility, on the melting temperatures, on the thermal reactivity and particularly on the formation of a liquid crystal in the fusion state. Indeed, when the number of carbon atoms in the flexible group is even, the solubility in common solvents is decreasing, the melting temperature is significantly higher, the thermal reactivity is stronger and the liquid crystal appears in the fusion state. These phenomena could be explained by the greater linearity of the even conformers. Worthily, for our compounds, whether the number of carbon atoms in the flexible group is even or odd, all show the type C Spectic liquid crystal after curing. We have also investigated the eutectic mixtures derived from these four compounds and proposed the blending formulations. These formulations can deeply reduce the melting temperatures, thus allow obtaining a better fluidity in the molten state. Beside these advantages, the proposed blending formulations protect liquid crystal states after the crosslinking during curing. The most interesting formulations were tested as adhesives for the metals assembly. We have characterized the samples (iron-iron assembly) prepared from our glues and compared these with the samples from an industrial glue (known as performance). The chosen industrial glue is also a bismaleimide-type but don't display the liquid crystal state. An enormous number of samples (about of 200) from our glues and the referent glue were produced and exhibited for natural aging in severe climates in Vietnam and Morocco and also in laboratory. The results of these examinations reliably show that the performance of adhesives prepared from the bismaleimide liquid crystals is higher than the industrial glue. We have proposed, in this word, a liquid crystal glue. Finally, a pre-feasibility study of our products at pilot scale has realized and demonstrated their production possibility in the industrial conditions
Systèmes dynamiques quantiques ouverts by Dominique Fellah( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

Some open quantum systems are studied with the recent dynamical systems theory. Volterra equation drives the dynamics of a small system interacting with a reservoir. Davies had proven markovian results in the weak coupling limit. Davies generator and Van Hove operator are strictly defined and computed for classical models. A completely positive semi-group acting on the observables of the small system is given by its generator-Davies generator. We give some conditions to obtain the complete positivity and in this way the standard models run. A direct method solves the master equation for the system given by the harmonic oscillators. We establish relaxation to a steady state which turns out to be a thermal equilibrium state. Feshbach formula links up the resolvent of the liouvillean and Davies generator of the small system. Under reasonable assumptions of the bosonic field one-dimensional, we build a stationary Gaussian process. The dynamics of the density matrices of the small system can turn out Markovian if an invariant measure exists
Greffage de résine et membrane polymères par des agents chelatants : application à l'extraction en phase solide de cations métalliques by Sabrina Boussetta( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

Dans le but de connaître l'impact de l'ensimage sur la nature et les propriétés de l'interphase d'un composite cyanate/fibre de verre D, quatre types d'échantillons ont été réalisés : une série de trois composites mis en œuvre par moulage au sac et qui différent par l'absence ou la présence d'ensimage (avec ou partiellement extrait), et des échantillons de résine seule. L'analyse mécanique dynamique a été choisie pour étudier ces composites. Les relaxations mécaniques, notamment la relaxation principale associée à la Tg de la résine, sont largement modifiées par l'état de l'interphase. Une étude approfondie de cette transition nous permet d'émettre des hypothèses sur la formation et la nature de l'interphase pour ce système. Ces résultats sont corroborés par des analyses complémentaires (microscopie infrarouge, microanalyse thermique ...). Enfin, des vieillissements ont été réalisés sur les composites et la résine afin de caractériser plus finement cette interphase
Inversion géoacoustique temps réel de signaux large bande par grands fonds by Christophe Viala( Book )

2 editions published between 2007 and 2014 in French and held by 2 WorldCat member libraries worldwide

This thesis describes the development of a real time geoacoustic inversion method devoted to broad band signals. Aim of this method is to automatically infer geoacoustic bottom characteristics from transmission sound field pressure measurements in a deep ocean medium. Finality is to inform sonar operational team about the parameters of the bottom, so that it can improve the performance evaluation of their acoustic sensors. This work provides useful experience for the design of the future prototype of acoustic REA (Rapid Environment Assestnent). Validation of the concept takes place in this thesis after the implementation of a global step of inversion based on the matching of transmission measured impulse responses and the impulse responses simulated by a ray model able to take into account bottom parameters. Two stages of inversion are necessary. A first one to find the experimental configuration, then another one to determine bottom characteristics. This inversion method is applied in a quasi-automated way to a complex synthetic data set, generated by a real time simulator of the acoustic transmitted signal. Tests on synthetic data set first validate the feasibility of the method and its performances in term of detection of a horizontal transition of the porosity, and in respect of the operational time consuming constraint. It allows to describe also Doppler effect impact on the inversion performances. The method is then successfully tested on acoustic and environmental data set recorded by the Military Center of Oceanography of the EPSHOM in deep water, unfavourable case for the inversion because of the weak informative contents of the signals. The taking into account of a bottom evolutive model in the method of inversion makes it possible to reverse an evolutive medium (with the distance) and to synthesize all the inversion results of atypical campaign of REA
 
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Alternative Names
Université de Toulon et du Var. Faculté de Sciences et Techniques

Languages
French (41)