Дисертації з теми "Analyse de discrimination linéaire"
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Mekkass, Francis. "Etude exploratoire de la discrimination par les quantités de réponses itérées chez l'humain." Thesis, Lille 3, 2016. http://www.theses.fr/2016LIL30064/document.
This dissertation focuses on discrimination of behaviors by iterated responses, which falls in the scope of field of discrimination by quantities. First, we investigate how discrimination by several couples of iterated responses quantities could be related with the evolution of instantaneous rates of iterated responses entropy. Then, iterated responses dynamic was analyzed for several iterated responses quantities, and response topographies. The third experiment investigates the correspondence between specific dynamics of responses exhibited in fixed-ratio schedules and discrimination by couples of quantities of iterated responses. At last, effects of the disruption of the installation of the dynamic of responses on discrimination by these quantities of iterated responses have been measured. Results show that discrimination by quantities of iterated responses is possible, and that specific dynamics of responses match specific quantities of iterated responses. Although correspondence between such dynamics and discrimination have not been demonstrated, effects of disruption of dynamic of responses installation have been observed suggesting that a link between dynamic of responses and discrimination exists
Gibert, Claude. "Analyse modale non-linéaire expérimentale." Phd thesis, Ecole Centrale de Lyon, 2001. http://tel.archives-ouvertes.fr/tel-00591587.
Rosenberger, Corinne. "Etude biochimique de l'autisme : analyse linéaire discriminante." Paris 5, 1988. http://www.theses.fr/1988PA05P243.
Carlsson, Veronica. "Artificial intelligence in radiolarian fossil identification : taxonomic, biostratigraphic and evolutionary implications." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR092.
Micropaleontology is not only about studying the organisms themselves, rather understanding Earth's past environments, with applications ranging from biostratigraphy to paleoceanography as well as being able to study evolutionary changes within morphospecies in time and space. This field is facing numerous challenges, since the analysis of microfossils demands significant human effort and taxonomic expertise, often leading to inconsistencies in interpretations. This work focuses on the application of using Artificial Intelligence (AI), such as Artificial Neural Networks (ANNs), for automatic image recognition of tropical Atlantic middle Eocene radiolarians. Large datasets have been constructed, in order to train different neural networks and our results show that the neural networks can automatically classify several different classes of radiolarians down to a species level, as well as in many cases being able to identify closely related species and even evolutionary transition morphotypes. It has also been able to correctly identify less broken or blurry radiolarians. It was also successfully applied to automatic image recognition for a biostratigraphic work, which in general could detect more general ages or highly precise bio events. This work includes the use of the classical neural network approaches for analysing visual context such as Convolutional Neural Networks (CNNs) but also includes the use of Spiking Neural Networks (SNNs), which is not as commonly used for automatic image recognition, as CNNs. SNNs resulted in almost or equal amount of accuracy obtained as for CNNs, just that the use is more computational efficient and takes up less memory. There have also been some comparisons using traditional morphometric analyses, such as Linear Discrimination Analysis (LDA), giving approximately the same kind of results. Our research not only aims to simplify and speed up the analysis process but also helps in increasing the accuracy and consistency of micropaleontological interpretations, which eventually, will contribute to the high-resolution studies in order to understand Earth's past history
Elkalay, Abderrafiaa. "Analyse par ondelettes et analyse non-linéaire de l'algèbre des bosses." Paris 9, 1996. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1996PA090020.
FORTES, GALVEZ JOSE. "Analyse syntaxique lr(k) par discrimination retrograde." Nice, 1999. http://www.theses.fr/1999NICE5299.
Hervé, Benjamin. "Crissement d'embrayage : Analyses linéaire, non-linéaire et étude expérimentale." Ecully, Ecole centrale de Lyon, 2009. http://www.theses.fr/2009ECDL0005.
In cars with manual transmission, squeal noise may be observed, among other unforced vibrations, during the sliding phase of the clutch engagement. It may arise even when the friction coefficient is almost constant. Consequently, friction-induced mode coupling instabilities due to the intrinsic structure of the system is assumed to be responsible for this phenomenon. The present thesis deals with the analysis of the conditions for a destabilization of the stationary sliding state and the resulting rise of vibrations in clutches due to such a mechanism. A phenomenological model is proposed in order to illustrate such a behaviour. Both linear and non-linear parametric investigations are performed in order to highlight the interaction between fundamental actions including circulatory, gyroscopic and damping actions. Important results are exposed, especially regarding the effect of the damping structure. They lead to a better understanding of the dynamic of systems subject to flutter instabilities. In particular, the destabilization paradox and a dynamical extension which can be proposed are exposed. In the meanwhile, a dedicated test bench has been designed in order to perform detailed in situ analysis of the phenomenon. The proposed model and the identified dynamic show a good qualitative correspondance. Moreover, an experimental parametric study reveals dependencies of the clutch squeal noise phenomenon to some major working conditions, such as driving speed, transmitted torque and engaged gearbox ratio. Most of the theoretical results are expressed in a non-dimensional form. Thus, they can be applied to a large variety of models and mechanical systems
Triki, Sami. "Analyse linéaire et non linéaire auto-adaptative des coques de révolution par éléments finis." Compiègne, 1996. http://www.theses.fr/1996COMPD953.
Hamonier, Julien. "Analyse par ondelettes du mouvement multifractionnaire stable linéaire." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2012. http://tel.archives-ouvertes.fr/tel-00753510.
Lemoine, Yves. "Classification et discrimination Analyse discriminante typologique et applications /." Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/1979/Lemoine.Yves.SMZ79004.pdf.
Sfikas, Giorgos. "Modèles statistiques non linéaires pour l'analyse de formes : application à l'imagerie cérébrale." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00789793.
Dimi, Jean-Luc. "La régression minimax non linéaire." Paris 6, 1987. http://www.theses.fr/1987PA066339.
Guenfoud, Mohammed. "Deux éléments triangulaires nouveaux pour l'analyse linéaire et non linéaire géométrique des coques." Lyon, INSA, 1990. http://www.theses.fr/1990ISAL0088.
[The construction of a simple and effective numerical model for curved structures is an important and continually up-dated subject. The work developed in this domain is related to two principal difficulties. * The geometrical hypothesis adopted in the shell theory (shallows shell or deep shell theory). * The kinematic hypothesis adopted in the strain-displacement relations. The elements developed in this paper are based on the curvilinear shell theory proposed by PARK and on the HENCKY - MINDLIN's kinematic hypothesis. Generally, two problems are encountered during the modelling of the co curved structures. The first problem is the geometrical representation of the structure, solved by realizing a simple geometrical approximation. The second is the membrane and transverse shear locking phenomenon. The most generally used solutions for treating the locking phenomenon are the method of reduced integration and the mode decomposition technique. However, these solutions remain curative and lead many problems either with their limited field or of a numerical nature. These difficulties led to a new. Method based on the approach of PARK which constitutes a preventive solution: indeed this approach is based in the avoidance of these problems before they appear. Two shell elements based on this approach are formulated. The first element is a three nodes linear triangular element and the second one is a six nodes quadratic triangular element. ]
Ikhouane, Fayçal. "Commande adaptative non-linéaire. : Synthèse Robuste et Analyse Transitoire." Caen, 2001. http://www.theses.fr/2001CAEN2043.
Lesaffre, Nicolas. "Stabilité et analyse non-linéaire du contact rotor-stator." Ecully, Ecole centrale de Lyon, 2007. http://bibli.ec-lyon.fr/exl-doc/nlesaffre.pdf.
Nowadays, more than ever, turbomachinery designers seek for increase the efficiency of their machines what could result in a loss of weight and a decrease in fuel consumption. The efficiency of jet engines depends strongly on the clearance between the rotating and stationary parts : the wider the clearance, the less efficient the machine. Hence it is desirable to reduce the clearance by as much as possible. However, reduced clearances increase the possibility of violent contacts between rotor and stator. Unfortunately this case of contact is highly harmful to such machines. As a matter of fact, under certain conditions it can generate instabilities or chaotic behaviours of the rotating parts. The large amplitude vibrations that result may damage severely the engine. Thus, it is fundamental for Turbomachinery firms to better understand the leading phenomenon responsible for the instability of the structure resulting from rotor-stator contacts. In this study, simple models of an elastic ring excited by rotating beams are developed, in the rotating frame, in order to understand the phenomenology associated with blade-casing interaction. Divergence instabilities as well as mode coupling instabilities will thus be underlined. The associated critical speeds will be expressed analytically as a function of the structure parameters. The inuence of rubbing will also be determined and the behaviour of the system resulting from this interaction will be studied through time integrations and frequency methods. Finally, a complete model of a exible bladed-rotor will be developed in the rotating frame too. Stability analysis of such a rotating structure will be made easily in the case of asymmetric rotating parts. Then the interaction between this bladed-rotor and an elastic casing resulting from an unbalance mass or from a shock on the stator will be analysed. Instabilities will also be underlined and correlated with those obtained when using the simple models. Cases where the dynamics of the stator drives the behaviour of the structure, resulting in static configurations where contacts are maintained between only some particular blades and the casing will be shown. When the dynamics of the bladed-disk plays a role in the dynamics of the structure, dynamic configurations will be underlined. Finally, chaotic behaviours of the system will be obtained in case of rubbing between the blades of the rotor and the casing
Pshenitsyna, Natalia. "[Analyse asymptotique et numérique des problèmes d'acoustique non-linéaire]." Saint-Etienne, 2007. http://www.theses.fr/2007STET4015.
Existence and uniqueness of non-linear acoustic wave in media with relaxation problem solution is proved. A homogenized problem is constructed. Its solution existence and uniqueness are demonstrated. Homogenized solution proximity to the exact solution is proved. Asymptotic expansion with respect to the small parameter, integral part factor, is constructed. Its existence and convergence to the exact solution as the parameter tends to zero is proved. For the proofs special solution spaces are constructed. Galerkin approximations method is applied, solution norm estimates are derived of the energy balance equations, a priori estimate of continuous dependence of solution with respect to the discrepancy. Existence of Burgers equation statistical solution is proved. On the assumption of some properties of the source stochastic process the following properties of solution are verified : homogeneity (shift independence) of stochastic measure, stationarity, ergodicity. A new approach is developed : a finite difference scheme corresponding to the problem is used for the proofs. Its solutions are considered as discrete stochastic processes approximating continuous stochastic process of solution
Taha, Khaled. "Analyse numérique d'algorithmes pour la programmation linéaire-quadratique généralisée." Rouen, 1995. http://www.theses.fr/2000ROUES035.
In this work, we present a theoretical and numerical study of extended linear-quadratic programming. We start with bringing out the different proprieties of objective and defining the relation of optimality with variational inequalities and linear complementarity problems. To solve the problem numerically, we adapt first and foremost a SQP variant of the quasi-Newton method BFGS and suggest the proximal point algorithm for the non-differentiable case. In the following, we deal with interior point methods and propose a new method based on solving a sequence of quasi-definite systems. This method takes advantage of the particular structure of these systems. Afterwards, we generalize our study on the minimax problem. In this context, two important cases are analysed; the case of polyhedral constraints and the case of linear matrix inequalities. Finally, we apply our results to solve problems of dynamic and stochastic optimisation. Numerical simulations done in this work assess the efficiency of our method
Bulteau, Solène. "Développement et analyse de schémas numériques préservant les régimes asymptotiques de diffusion linéaire et non linéaire." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4046.
The aim of this work is to build and analyse schemes able to discretize the solutions of hyperbolic systems of conservation laws endowed with a source term. The main property required here is the preservation of the asymptotic behaviour, in other words the schemes must stay accurate in the diffusive regime, namely the long time and stiff source term regime. This manuscript is divided in two parts. The first one is dedicated to the presentation of a rigourous numerical convergence result for a scheme discretizing the solutions of the p-system. The convergence rate obtained is explicitly exhibited and coincides with the results obtained in the continuous and semi-discrete frameworks. The second part is devoted to the development of asymptotic preserving schemes and two methods are proposed. The first one is a generalization of the perturbed HLL method introduced by Berthon and Turpault in order to treat source terms of quadratic form and the second one is able to preserve both all the steady states and the diffusive limit
Daldoul, Mabrouk. "Contribution aux méthodes proximales et applications à la régression linéaire l1." Dijon, 1995. http://www.theses.fr/1995DIJOS042.
Qannari, Abdellah. "Approximations de matrices et régression linéaire sur des prédicteurs quasi-colinéaires." Rennes 2, 1993. http://www.theses.fr/1993REN20024.
Cano, Guillaume. "Interaction entre algèbre linéaire et analyse en formalisation des mathématiques." Phd thesis, Université Nice Sophia Antipolis, 2014. http://tel.archives-ouvertes.fr/tel-00986283.
Simoneau, Kevin. "Analyse non-linéaire du comportement dynamique des sols granulaires lâches." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28164/28164.pdf.
Huck, Alexis. "Analyse non-supervisée d’images hyperspectrales : démixage linéaire et détection d’anomalies." Aix-Marseille 3, 2009. http://www.theses.fr/2009AIX30036.
This thesis focusses on two research fields regarding unsupervised analysis of hyperspectral images (HSIs). Under the assumptions of the linear spectral mixing model, the formalism of Non-Negative Matrix Factorization is investigated for unmixing purposes. We propose judicious spectral and spatial a priori knowledge to regularize the problem. In addition, we propose an estimator for the projected gradient optimal step-size. Thus, suitably regularized NMF is shown to be a relevant approach to unmix HSIs. Then, the problem of anomaly detection is considered. We propose an algorithm for Anomalous Component Pursuit (ACP), simultaneously based on projection pursuit and on a probabilistic model and hypothesis testing. ACP detects the anomalies with a constant false alarm rate and discriminates them into spectrally homogeneous classes
Masrar, Mohammed. "Analyse non linéaire par éléments finis des matériaux hyperélastiques incompressible." Lyon, INSA, 1990. http://www.theses.fr/1990ISAL0074.
[The design of mechanical systems becomes largely automatised with the use of computers ; On the other hand, the constant performance increase of machines requires a better definition of their elastic supports especially for laminated elastomeric bearings used in aeronautic. The design of laminated elastomeric bearing is based on the calculation of the material behaviour as the manufacturing process difficulties do not permit systematic experimental programs. The purpose of this work was to develop original techniques based on the finite element method in order to calculate the static behaviour of laminates elastomeric bearings streched under large deformations. Elements of the rubber-like elasticity. Example with analytical solutions, have been considered for the qualification of the software and the justification of the non-linear analysis has been shown. A 5 layers laminated elastomeric bearing has been studied in details in order to isolate the influence of the parameters. The constitutive law of rubber and the mechanical characteristics of deformable support are preponderant parameters. ]
Aheto, Kouassivi. "Conception et analyse non linéaire des oscillateurs à quartz ultrastables." Besançon, 1990. http://www.theses.fr/1990BESA2048.
Théra, Michel A. "Contributions à l'analyse non linéaire." Paris 1, 1988. http://www.theses.fr/1988PA010058.
Auburtin, Christian. "Analyse linéaire et non-linéaire de structures poutres planes par éléments finis et méthodes multigrilles sur micro-ordinateur." Vandoeuvre-les-Nancy, INPL, 1990. http://www.theses.fr/1900INPL040N.
Alexandre, Herve. "L'EFFICIENCE BRUITÉE. UNE ANALYSE NON LINÉAIRE DU MARCHÉ FRANÇAIS DES ACTIONS." Phd thesis, Université de Bourgogne, 1994. http://tel.archives-ouvertes.fr/tel-00490273.
Riviere, Nicolas. "Modélisation et analyse temporelle par réseaux de Petri et logique linéaire." Phd thesis, INSA de Toulouse, 2003. http://tel.archives-ouvertes.fr/tel-00134974.
Marty, Jérémy. "Analyse expérimentale des cinématiques de changement d'échelles en mécanique non linéaire." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0013/document.
Industry employ more and more composite materials in structures todecrease the weight. At the microstructure scale behavior is strongly heterogeneous but at the structure scale behaviour may be considered homogeneous. Multiscale methods have been developed to solve the structural problems with a reasonable calculation time. These methods are validated by comparison with a numerical calculation where heterogeneities are fully meshed. In this thesis work, an ideal architectural material was created in the center of a (homogeneous) stainless steel (304L) thin plate. The unit cell architecture material consists of a square with a hole in the center. The use of a high resolution camera (270 million pixels) allows to follow simultaneously the evolution of deformation at microscopic and macroscopic scales. The orientation of the heterogeneous structure modifies the sollicitations applied to the unit cells. The experiments are designed to analyze the kinematics of deformation of the unit cells in a multi-axial loading. Unit cells with periodic kinematics are searched. It is thus shown that the cells with a non-periodic kinematic correspond to the transition zone between the homogeneous material and the architectured material. Knowledge of the kinematic cells allows to investigate the scale changings in the linear and nonlinear range. The downscaling from the macroscopic to the microscopic scale is particularly studied with the choice of boundary conditions. An equivalent homogeneous medium (MHE) is determined as a remplacement for the cells having a periodic kinematic. The geometry of the unit cell introduced symmetries in the behavior of MHE, it becomes cubic (orthotropic with material parameters). The elastic characteristics of the MHE are obtained by homogenization from the experimental results. A criterion of Tsai-Hill is identified in the non-linear domain. The last chapter is interested in cracking of the architected zone and the initiation of strain localization in cells. The support of location is calculated from the strain field measured by correlation. The kinematics of the cell is enriched with a discontinuity and the displacement jump normal to the localization is identified. A comparison with the displacement jump calculated by extended digital image correlation at the macroscopic scale is conducted to validate the identification strategy at the microscopic level
Nguyen, Thuong Anh. "Analyse systématique du concept de comportement linéaire équivalent en ingénierie sismique." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1032/document.
In earthquake engineering, it is common that the behaviour of a structure undergoing a strong motion is characterized by wise or narrow hysteresis loops depending on the type of behaviour of the structure. Considering this non-linear behaviour in a transient calculation requires a huge need of resources in terms of calculation time and memory. In this context, the method of equivalent linearization, consisting in the evaluation of the non-linear response of the structure has been introduced by geotechnical engineers In the 1970s. Despite efforts of many authors, this method is still not used in structural field. The goal of this research is to examine the linear equivalent behaviour in the context of the simplified method of evaluating the non-linear response of a structure in earthquake engineering. We review the criteria of equivalence adopted by many methods searching for the equivalence of (1) the maximum of displacement or (2) quantity of dissipated energy or (3) the restore force. Our argumentative analyses carry out that these three criteria are not pertinent and/or efficient. This leads, in some cases, to some unexplained results. We show the important role, which is mostly neglected in existing method, of frequency content while evaluating the ductile demand. Based on this recognition, we introduce a new method of equivalent linearization based on the transfer function. We use this method in order to explore a numerical experimental plan in which we calculate the equivalent characteristics (frequency and damping) versus the ductile demand for different configuration characterized by (a) the ratio between the frequency of the oscillator and the central frequency of the input signal, (b) the hardening and (c) the behaviour which covers the elastoplastic and damaged ones. We propose two new approaches of the linear equivalent behaviour. The first one, aiming to improve the non-linear static procedure of ATC40, use the secant stiffness and the maximal displacement. This approach consists in an estimation of damping which is different to ATC40. Its pertinence is established by evaluating with accuracy the maximal displacement of the canonical non-linear systems. The second approach consists in restitution of the dynamic of the response of a non-linear oscillator by using the transfer function. The pertinence of this proposition is shown through the criteria of Anderson, especially in terms of transferred motion. In this effect, the linear equivalent behaviour based on the transfer function allows to cope the transferred motion through the non-linear oscillator without performing the non-linear transient calculation. The validation of the linear equivalent behaviour based on the transfer function has been examined on real structures through some experimental tests such as the reinforced concrete wall (SAFE) or piping systems (BARC and EPRI)
Lalaude-Labayle, Marc. "L'enseignement de l'algèbre linéaire au niveau universitaire : Analyse didactique et épistémologique." Thesis, Pau, 2016. http://www.theses.fr/2016PAUU3044/document.
Our research is concerned with the teaching of linear algebra at the university level. More precisely, it focuses on the teaching of linear transformations in Classes Préparatoires aux Grandes Écoles. The theory of didactical situations, jointly with Peirce’s semiotics, constitute the main theoretical framework of our works and allow us to analyse student’s reasoning in situations of oral evaluation. Firstly, we put forward some epistemological aspects highlighting the links between linear transformations and the emergence of linear algebra. Then, with a didactical objective, we outline the main features of Perice’s semiotics and its algebraization with the treillis of sign’s categories. Hence, we can enhance the model of analysis for reasoning processes of Bloch and Gibel and build a tool for semiotic analysis called semantic diagram. We illustrate the use of this tool by conducting a local semiotic a priori analysis of a mathematical situation. This analysis highlight the link between the first signs and actions of the situation and the resulting semiosis. Next, we analyse some students’ reasonings produced during oral evaluations said « classical ». This analysis confirms the link between the lack of an adidactical milieu and the semantic difficulty to organize and articulate the objects and signs in a proof situation. Then we experiment a situation of oral evaluation in which the adidactical milieus are rich enough and stabilized. The analysis of the reasoning process conducted in this experimental situation allows us to show that, in this case, the students rely on a semantic point of view on the objects to produce their validations and controls their productions. These three different moments of our research attest the importance of the heuristic practices and discourse in the field of linear algebra
Alves, Plinio Ricardo Ganime. "Analyse électromagnétique d'un filtre à phase linéaire à iris inductifs épais." Limoges, 1989. http://www.theses.fr/1989LIMO4005.
In millimeter wevelength range, Iris, Waveguide side wall slots used to build filters and directional couplers should not be considered thin since their dimensions are not smaller than the wavelength. In this work, the rigorous mode matching technique is used to compute equivalent models for thick iris and thick rectangular waveguide side wall slots. We have applied those results to th design and the realization of millimeter waveguide linear phase filters, waveguide side wall thick slot couplers and thick iris waveguide filters
Guo, Ying Qiao. "Analyse non linéaire statique et dynamique des poutres tridimensionnelles élasto-plastiques." Compiègne, 1987. http://www.theses.fr/1987COMPD076.
Loire, Guillaume. "Synthèse et analyse d'oligothiophènes chiraux pour les matériaux d'optique non-linéaire." Paris 6, 2003. http://www.theses.fr/2003PA066196.
Rivière, Nicolas. "Modélisation et analyse temporelle par réseaux de Pétri et logique linéaire." Toulouse, INSA, 2003. http://www.theses.fr/2003ISAT0028.
The aim of this thesis is to contribute to the elaboration of design assistance methods of cooperative systems while taking into account temporal constraints in a quantitative way. The developed approach is based on Petri nets, linear logic and temporal constraints networks. This is an "event" oriented approach and not a "state" oriented one as it is often the case in the approaches based on Petri nets. It is split in two steps: a step of "qualitative" analysis and a step of "quantitative" one. The first consists in obtaining the causality relations between the events belonging to a given scenario. The equivalence between a proof tree in linear logic and the finite process obtained by the unfolding of a Petri net from the same initial marking shows that these relations are precedence relations. The introduction of the concept of characteristic sequent makes it possible to implement a compositional approach of the processes from the rules of the linear logic sequent calculus. The second step consists in changing the graph describing the precedence relations into a temporal constraints graph expressing in a linear way the set of the quantitative temporal constraints which have to be verified by the dates of the firing transitions in a scenario. Thus, it become possible to exploit all the results of traditional techniques of analysis and constraints propagation. This step is completely consistent with p-time Petri nets but not easily compatible with the t-timed ones because they generate sets of constraints which are more complex. This approach is illustrated by a simple scheduling problem of multimedia documents. We showed thereafter how, for the t-timed Petri nets, we could process the firing dates and the sojourn durations of the tokens in the places of a net while remaining in a symbolic form within the framework of the weak semantics
Njonkou, Fankam Marc-Aurèle. "Analyse du mouvement dans les séquences d'images et filtrage linéaire récursif." Rouen, 1997. http://www.theses.fr/1997ROUES046.
Peng, Yaxin. "Analyse non-linéaire sur les variétés et applications au traitement d'images." Lyon, École normale supérieure (sciences), 2008. http://www.theses.fr/2008ENSL0472.
This thesis consists of three parts. The first is concerned with optimal Sobolev inequalities on compact Riemmannian manifolds. The second deals with some variational problems (minimisation problems) in image processing. The last one is devoted to denoising and detection of crest lines in 3-d points clouds
Alexandre, Hervé. "L'efficience bruitée : une analyse non linéaire du marché français des actions." Dijon, 1994. http://www.theses.fr/1994DIJOE001.
The recent introduction of investors with unperfect behaviours allows a more realistic representation of stocks markets. The idea of noise traders insists on the unability of certain rational investors to possess and use all available information. This thesis consists of a description of the impact of these investors of financial markets. We also look for appropriate tools to measure the consequences of their existence on efficiency. The first theoretical vision of financial markets was made of homogenous and perfectly informed investors. Now, we consider investors with heterogenous expectations. The changes in the hypothesis of behaviour lead to a modification in the statistical model for the test of efficiency (random walk, martingale). But all these works stay in the probabilistic paradigm of rational investor even if the introduction of non linear models (ARCH. . . ) Leads to an important progress. The deterministic chaos offers an other interesting way for the development of non linearity and free us from the probabilistic constraint. We show that a revision of the tests of efficiency comes with the introduction of chaos. The use of the BDS test can be interpreted here like a test of "classical" efficiency of market against the hypothesis that we call noisy efficiency. Noisy efficiency defines a market with rational and perfectly informed investors and noise traders. Our empirical study on the french stocks market confirms the noisy efficiency. It shows the unability of tests and models which suppose the linearity to describe the different behaviours on financial markets
Kahouadji, Lyes. "Analyse de stabilité linéaire d'écoulements tournants en présence de surface libre." Paris 6, 2011. http://www.theses.fr/2011PA066325.
Noiray, Nicolas. "Analyse linéaire et non-linéaire des instabilités de combustion : application aux systèmes à injection multipoints et stratégies de contrôle." Châtenay-Malabry, Ecole centrale de Paris, 2007. http://www.theses.fr/2007ECAP1049.
Combustion instabilities induced by resonant acoustic-flame coupling occur in manypractical systems and cause severe difficulties and in extreme cases provoke failure or catastrophic damage. In most cases, the combustion process and the flow field are coupled by the system acoustic modes yielding strong oscillations of the flow and release of heat within the system. The problem has been extensively investigated over a number of years and a considerable amount of information has been gathered on the basic driving and coupling mechanisms. The present thesis aims at answering some of pending questions by combining systematic experiments, with theoretical modeling and numerical simulation. Theoretical developments are devised to model the physical phenomena encountered in the experimental layout. Numerical simulations are also used to complement the experimental and analytical work. The important results of this work are : (1) The nonlinear framework relying on the flame describing function (FDF). This constitutes a substantial progress in the understanding of mechanisms yielding limit cycles and of other nonlinear processes such as hysteresis or instability triggering, which are commonly observed in combustion applications. (2) the original passive control strategy which was developped and uses a dynamical phase converter (DPC) to reduce the sensitivity of the flame collection to incident perturbations (patent has been filed on this basis)
Han, Woo-Suck. "Analyse linéaire et non-linéaire de plaques et coques par éléments finis en statique et dynamique sur micro-ordinateur." Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10177.
Khalil, Louay. "Influence de l’interaction sol-structure sur le comportement sismique des bâtiments : analyse dans les domaines linéaire et non linéaire." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10078/document.
The thesis concerns analysis of the influence of the soil-foundation-structure interaction on the seismic on the seismic response of buildings. The study is carried out using the finite differences method of the system soil, foundation and structure.The thesis is composed of three parts.The first one concerns analysis of the influence of the soil-foundation-structure interaction on the fundamental frequency of building. The soil-foundation system is modeled using translational and rotational discrete springs. Analyses conducted for various soil and structure conditions showed that the building fundamental frequency depends on the soil-structure relative rigidity (Kss). A chart is proposed for an ease consideration of the influence of the SSI in the determination of the fundamental frequency of buildings.The second part deals with the analysis of the soil-foundation-structure interaction in the elastic domain. It shows that the response of the structure depends on the complex interaction between the soil and the structure. It also shows that the elastic nonlinear behavior of soil makes induces additional difficulties because of the apparition of multiple frequencies in the soil. The third chapter analyses the influence of the soil and structure nonlinearities on the seismic response of the system soil-foundation-structure. This study shows the plasticity of the soil and structural elements have a significant influence on the seismic response of the structure
Noui, Lemnouar. "Classification des trivecteurs par l'action du groupe linéaire." Montpellier 2, 1995. http://www.theses.fr/1995MON20205.
Raynaud, Jean-Louis. "Exploitation simultanée des données spatiales et fréquentielles dans l'identification modale linéaire et non-linéaire." Besançon, 1986. http://www.theses.fr/1987BESA2013.
Delesalle, Denis. "Conception et analyse d'algorithmes numériques parallèles." Phd thesis, Grenoble INPG, 1993. http://tel.archives-ouvertes.fr/tel-00343434.
Posse, Christian. "Analyse exploratoire de données et discrimination à l'aide de projection pursuit /." [S.l.] : [s.n.], 1993. http://library.epfl.ch/theses/?display=detail&nr=1124.
Gautier, Serge. "Contributions à l'analyse non linéaire : inclusions différentielles, différentiabilité des multiapplications." Pau, 1989. http://www.theses.fr/1989PAUU3007.
Brunet, Edouard. "Etudes de systèmes microfluidiques : agrégation de particules, électrocinétique linéaire, analyse de protéines." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00007776.
Li, Wei. "Analyse numérique de problèmes non convexes à donnée au bord non linéaire." Metz, 1993. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1993/Li.Wei.SMZ9310.pdf.
In this thesis, we study a kind of non-convex varaitional problems. Such problems originated in material science, for example in crystal, etc. We consider the following problems : inf#(*(x)) dx; inf#(*(x))+((x)a(x)) dx on certain Sobolev space w#1#p(a) and where the energy density posses energy wells, say w1 i=1,. . . K. In general, such problems can be no classical solution. In our studies, the numerical method introduced by M. Chipot, C. Collins and D. Kinderlerer has been developped. In section 1 and 2 some results of estimation in a space of finit-element are obtained. Section 3 is contributed to an analysis or parametrized measure. We get a result of Young measure which showing the existence and uniqueness of the generalized solution. And in section 4, we have some estimation results in terms of probability, which explains the behavior of the minimising sequences