Esta tese propõe um modelo de adaptação organizacional em Sistemas Multiagentes (SMA) composto por um modelo de organização e um processo de reorganização. O modelo organizacional, chamado de MOISE+, considera três dimensões da organização de um SMA: a estrutura (grupos, papéis e ligações), o funcionamento (planos globais, metas e missões) e as obrigações e permissões dos agentes. A principal característica do modelo MOISE+ é facilitar a mudança organizacional em uma das dimensões sem comprometer as outras. É possível, por exemplo, alterar a estrutura da organização sem alterar o seu funcionamento e vice-versa. O processo de reorganização permite que os próprios agentes realizem a mudança através de quatro etapas: monitoração da organização corrente, projetos de planos de mudança, seleção dos planos e implementação do plano selecionado. A principal característica deste processo é a existência explícita da organização responsável pela reorganização (descrita na notação do modelo MOISE+) permitindo a abertura do processo. Estando a representação deste processo disponível aos agentes, estes podem participar da reorganização, bastando que compreendam a notação do modelo. Este processo foi implementado e avaliado em dois estudos de caso, empresas virtuais e futebol de robôs, nos quais as etapas de seleção e implementação foram enfatizadas, já que existem poucos trabalhos que abordam estas duas etapas do processo de reorganização. / This thesis proposes a reorganization model for Multiagent Systems (MAS). This reorganization model is composed by both an organizational model and a reorganization process. The organization model, called MOISE+, is based on three dimensions: the organizational structure (composed by roles, groups, links, etc.), the organizational functioning (composed by global plans, missions, goals, etc.), and the agents\' obligations and permissions. The MOISE+ model main feature is the independence among these dimensions. It is therefore possible to change the organizational structure without any change in the functioning. The reorganization process enables the agents themselves to perform the reorganization along four phases: monitoring (when to reorganize), design (ways of building a new organization), selection (how to choose a new organization), and implementation (how to change the current running organization). The reorganization process is explicitly described in MOISE+ notation and the agents have access to it. This property enables any agent to participate in the reorganization when he understands MOISE+ notation. The reorganization process is thus open since many agents can joint it. This process was implemented and evaluated in two domains: virtual enterprises and robot soccer. The experiments have focused mainly on the selection and implementation phases since the research on those phases is not very common in the literature.

Esta tese propõe um modelo de adaptação organizacional em Sistemas Multiagentes (SMA) composto por um modelo de organização e um processo de reorganização. O modelo organizacional, chamado de MOISE+, considera três dimensões da organização de um SMA: a estrutura (grupos, papéis e ligações), o funcionamento (planos globais, metas e missões) e as obrigações e permissões dos agentes. A principal característica do modelo MOISE+ é facilitar a mudança organizacional em uma das dimensões sem comprometer as outras. É possível, por exemplo, alterar a estrutura da organização sem alterar o seu funcionamento e vice-versa. O processo de reorganização permite que os próprios agentes realizem a mudança através de quatro etapas: monitoração da organização corrente, projetos de planos de mudança, seleção dos planos e implementação do plano selecionado. A principal característica deste processo é a existência explícita da organização responsável pela reorganização (descrita na notação do modelo MOISE+) permitindo a abertura do processo. Estando a representação deste processo disponível aos agentes, estes podem participar da reorganização, bastando que compreendam a notação do modelo. Este processo foi implementado e avaliado em dois estudos de caso, empresas virtuais e futebol de robôs, nos quais as etapas de seleção e implementação foram enfatizadas, já que existem poucos trabalhos que abordam estas duas etapas do processo de reorganização. / This thesis proposes a reorganization model for Multiagent Systems (MAS). This reorganization model is composed by both an organizational model and a reorganization process. The organization model, called MOISE+, is based on three dimensions: the organizational structure (composed by roles, groups, links, etc.), the organizational functioning (composed by global plans, missions, goals, etc.), and the agents\' obligations and permissions. The MOISE+ model main feature is the independence among these dimensions. It is therefore possible to change the organizational structure without any change in the functioning. The reorganization process enables the agents themselves to perform the reorganization along four phases: monitoring (when to reorganize), design (ways of building a new organization), selection (how to choose a new organization), and implementation (how to change the current running organization). The reorganization process is explicitly described in MOISE+ notation and the agents have access to it. This property enables any agent to participate in the reorganization when he understands MOISE+ notation. The reorganization process is thus open since many agents can joint it. This process was implemented and evaluated in two domains: virtual enterprises and robot soccer. The experiments have focused mainly on the selection and implementation phases since the research on those phases is not very common in the literature.

In mobile speech communication, adverse conditions, such as noisy acoustic environments and unreliable network connections, may severely degrade the intelligibility and natural- ness of the received speech quality, and increase the listening effort. This thesis focuses on countermeasures based on statistical signal processing techniques. The main body of the thesis consists of three research articles, targeting two specific problems: speech enhancement for noise reduction and flexible source coder design for unreliable networks. Papers A and B consider speech enhancement for noise reduction. New schemes based on an extension to the auto-regressive (AR) hidden Markov model (HMM) for speech and noise are proposed. Stochastic models for speech and noise gains (excitation variance from an AR model) are integrated into the HMM framework in order to improve the modeling of energy variation. The extended model is referred to as a stochastic-gain hidden Markov model (SG-HMM). The speech gain describes the energy variations of the speech phones, typically due to differences in pronunciation and/or different vocalizations of individual speakers. The noise gain improves the tracking of the time-varying energy of non-stationary noise, e.g., due to movement of the noise source. In Paper A, it is assumed that prior knowledge on the noise environment is available, so that a pre-trained noise model is used. In Paper B, the noise model is adaptive and the model parameters are estimated on-line from the noisy observations using a recursive estimation algorithm. Based on the speech and noise models, a novel Bayesian estimator of the clean speech is developed in Paper A, and an estimator of the noise power spectral density (PSD) in Paper B. It is demonstrated that the proposed schemes achieve more accurate models of speech and noise than traditional techniques, and as part of a speech enhancement system provide improved speech quality, particularly for non-stationary noise sources. In Paper C, a flexible entropy-constrained vector quantization scheme based on Gaus- sian mixture model (GMM), lattice quantization, and arithmetic coding is proposed. The method allows for changing the average rate in real-time, and facilitates adaptation to the currently available bandwidth of the network. A practical solution to the classical issue of indexing and entropy-coding the quantized code vectors is given. The proposed scheme has a computational complexity that is independent of rate, and quadratic with respect to vector dimension. Hence, the scheme can be applied to the quantization of source vectors in a high dimensional space. The theoretical performance of the scheme is analyzed under a high-rate assumption. It is shown that, at high rate, the scheme approaches the theoretically optimal performance, if the mixture components are located far apart. The practical performance of the scheme is confirmed through simulations on both synthetic and speech-derived source vectors. / QC 20100825

Dans cette thèse, nous démontrons la nécessité de l’appropriation de l’Intelligence Economique (IE) en tant que culture et mode de gouvernance alternatif capable d’aider un pays en développement à affronter les défis et enjeux triple. Ceux relatifs au sous-développement, au développement alternatif et à la mondialisation. S’approprier l’IE dans le contexte particulier de l’économie Congolaise pour en faire un mode de gouvernance au service du développement et de la coopétitivité renvoie ainsi à deux exigences. La première, consiste à revisiter l’IE afin de mettre en valeur ses avancées, révéler ses limites et l’enrichir d’une capacité de réponse adaptée aux besoins d’un pays en développement. La deuxième exigence consiste à analyser le champ d’appropriation de l’IE afin d’en identifier la nature, d’en dresser le profil et d’articuler ces éléments à ceux des moyens de l’IE dont la plasticité acquise permet désormais d’être adaptés à la contingence en examen. L’objectif est de proposer des moyens pertinents à la mise en œuvre efficiente de l’IE. La conceptualisation des modes opératoires d’intelligence et de sécurité économique (2S-MOISE) chevillé au dispositif stratégique et opératoire du développement (DS-OD), au « M’BONGUI » ainsi qu’au schéma d’analyse de dominance systémique nous permet de répondre à cette double exigence. L’usage de la démarche incrémentale via la transculturation nous permet par ailleurs de présenter les modalités concrètes du processus d’appropriation de l’IE grâce à l’action de la direction générale de l’économie (DGE), vectrice dudit processus tant au sein des instances nationales, qu’au niveau du système éducatif et dans la sphère entrepreneuriale. Une série de préconisations dont la définition d’éléments d’une politique publique d’IE, la mise en place d’un dispositif d’IE et d’un système d’information qui réponde aux besoins de gouvernance fonctionnelle, opérationnelle et stratégique ont été proposés. / In this thesis, we demonstrate the need for ownership of Competitive Intelligence (CI) as a culture and way of governance alternative that can help a developing country to face the triple challenges and issues. Those related to underdevelopment, alternative development and globalization. EI ownership in the particular context of the Congolese economy into a mode of governance for development and coopétitivité thus refers to two requirements. The first is to revisit the IE to showcase its advances, revealing its limitations and to enhance response capability tailored to the needs of a developing country. The second requirement is to analyze the scope of appropriation of IE in order to identify the nature, to raise the profile and articulate its elements to those means which the IE can now acquired plasticity of be adapted to contingency under consideration. The objective is to propose ways relevant to the efficient implementation of EI. The conceptualization of intelligence procedures and economic security (2S-MOSES) pegged to device strategic and operational development (OD-DS), the "M'BONGUI" and the pattern of systemic dominance analysis allows us to meet both requirements. The use of the incremental approach through transculturation also allows us to present the actual procedures of appropriation of the IE through the action of the General Directorate of the Economy (DGE) vector process that bothnational fora, that the education system and in the entrepreneurial sphere. A series of recommendations which define elements of a public policy of IE, the setting up of an IE and an information system that meets the needs of functional governance, operational and strategic are been proposed.

Dans cette thèse, nous démontrons la nécessité de l’appropriation de l’Intelligence Economique (IE) en tant que culture et mode de gouvernance alternatif capable d’aider un pays en développement à affronter les défis et enjeux triple. Ceux relatifs au sous-développement, au développement alternatif et à la mondialisation. S’approprier l’IE dans le contexte particulier de l’économie Congolaise pour en faire un mode de gouvernance au service du développement et de la coopétitivité renvoie ainsi à deux exigences. La première, consiste à revisiter l’IE afin de mettre en valeur ses avancées, révéler ses limites et l’enrichir d’une capacité de réponse adaptée aux besoins d’un pays en développement. La deuxième exigence consiste à analyser le champ d’appropriation de l’IE afin d’en identifier la nature, d’en dresser le profil et d’articuler ces éléments à ceux des moyens de l’IE dont la plasticité acquise permet désormais d’être adaptés à la contingence en examen. L’objectif est de proposer des moyens pertinents à la mise en œuvre efficiente de l’IE. La conceptualisation des modes opératoires d’intelligence et de sécurité économique (2S-MOISE) chevillé au dispositif stratégique et opératoire du développement (DS-OD), au « M’BONGUI » ainsi qu’au schéma d’analyse de dominance systémique nous permet de répondre à cette double exigence. L’usage de la démarche incrémentale via la transculturation nous permet par ailleurs de présenter les modalités concrètes du processus d’appropriation de l’IE grâce à l’action de la direction générale de l’économie (DGE), vectrice dudit processus tant au sein des instances nationales, qu’au niveau du système éducatif et dans la sphère entrepreneuriale. Une série de préconisations dont la définition d’éléments d’une politique publique d’IE, la mise en place d’un dispositif d’IE et d’un système d’information qui réponde aux besoins de gouvernance fonctionnelle, opérationnelle et stratégique ont été proposés. / In this thesis, we demonstrate the need for ownership of Competitive Intelligence (CI) as a culture and way of governance alternative that can help a developing country to face the triple challenges and issues. Those related to underdevelopment, alternative development and globalization. EI ownership in the particular context of the Congolese economy into a mode of governance for development and coopétitivité thus refers to two requirements. The first is to revisit the IE to showcase its advances, revealing its limitations and to enhance response capability tailored to the needs of a developing country. The second requirement is to analyze the scope of appropriation of IE in order to identify the nature, to raise the profile and articulate its elements to those means which the IE can now acquired plasticity of be adapted to contingency under consideration. The objective is to propose ways relevant to the efficient implementation of EI. The conceptualization of intelligence procedures and economic security (2S-MOSES) pegged to device strategic and operational development (OD-DS), the "M'BONGUI" and the pattern of systemic dominance analysis allows us to meet both requirements. The use of the incremental approach through transculturation also allows us to present the actual procedures of appropriation of the IE through the action of the General Directorate of the Economy (DGE) vector process that bothnational fora, that the education system and in the entrepreneurial sphere. A series of recommendations which define elements of a public policy of IE, the setting up of an IE and an information system that meets the needs of functional governance, operational and strategic are been proposed.

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Dans cette thèse, nous démontrons la nécessité de l'appropriation de l'Intelligence Economique (IE) en tant que culture et mode de gouvernance alternatif capable d'aider un pays en développement à affronter les défis et enjeux triple. Ceux relatifs au sous-développement, au développement alternatif et à la mondialisation. S'approprier l'IE dans le contexte particulier de l'économie Congolaise pour en faire un mode de gouvernance au service du développement et de la coopétitivité renvoie ainsi à deux exigences. La première, consiste à revisiter l'IE afin de mettre en valeur ses avancées, révéler ses limites et l'enrichir d'une capacité de réponse adaptée aux besoins d'un pays en développement. La deuxième exigence consiste à analyser le champ d'appropriation de l'IE afin d'en identifier la nature, d'en dresser le profil et d'articuler ces éléments à ceux des moyens de l'IE dont la plasticité acquise permet désormais d'être adaptés à la contingence en examen. L'objectif est de proposer des moyens pertinents à la mise en œuvre efficiente de l'IE. La conceptualisation des modes opératoires d'intelligence et de sécurité économique (2S-MOISE) chevillé au dispositif stratégique et opératoire du développement (DS-OD), au " M'BONGUI " ainsi qu'au schéma d'analyse de dominance systémique nous permet de répondre à cette double exigence. L'usage de la démarche incrémentale via la transculturation nous permet par ailleurs de présenter les modalités concrètes du processus d'appropriation de l'IE grâce à l'action de la direction générale de l'économie (DGE), vectrice dudit processus tant au sein des instances nationales, qu'au niveau du système éducatif et dans la sphère entrepreneuriale. Une série de préconisations dont la définition d'éléments d'une politique publique d'IE, la mise en place d'un dispositif d'IE et d'un système d'information qui réponde aux besoins de gouvernance fonctionnelle, opérationnelle et stratégique ont été proposés.

Les microphones capacitifs sont des transducteurs réciproques dont les qualités (sensibilité, bande passante et tenue dans le temps) en font des instruments de mesure performants. Couramment utilisés jusqu’à présent en récepteurs dans l’air à pression atmosphérique et à température ambiante, dans la gamme de fréquences audibles, ils sont correctement caractérisés dans ce cadre depuis près de trente ans. Mais aujourd’hui, leur miniaturisation (par procédé MEMS) et leur usage nouveau en métrologie fine (en récepteurs comme en émetteurs) - qui exigent une connaissance précise de leur comportement dans des domaines de fréquences élevées (jusqu’à 100 kHz), dans des mélanges gazeux aux propriétés différentes de celles de l’air et dans des conditions de pression et de température beaucoup plus élevées ou beaucoup plus basses que les conditions standards - nécessitent une caractérisation beaucoup plus approfondie, aussi bien en terme de modélisation qu’en terme de résultats expérimentaux. C’est ainsi que ici -i/ les effets des couches limites thermiques (seules les couches limites visqueuses sont habituellement retenues) sont introduits dans le modèle, ce qui amène dans le chapitre premier à une étude analytique de la diffusion thermique en parois minces (dont la portée dépasse le cadre strict du transducteur), -ii/ l’influence des orifices de l’électrode arrière sur la déformée de la membrane est traitée au départ par une méthode analytique originale, qui permet de traduire les conditions en frontière non uniformes sur la surface de l’électrode sous forme de sources locales virtuelles, associées à des conditions de frontière rendues uniformes (chapitre second), -iii/ des solutions analytiques nouvelles, dépendant à la fois des coordonnées radiales et azimutales, sont obtenues pour le champ de déplacement de la membrane et pour les champs de pression dans les cavités du microphone par usage de théories modales compatibles avec les couplages multiples qui y prennent place (troisième chapitre), -iv/ un modèle de « circuit à constantes localisées » (reporté pour l’essentiel en annexe) est proposé, à des degrés divers de précision, qui permet en particulier d’accéder de façon simple à la sensibilité et au bruit thermique du microphone (fin du quatrième chapitre), -v/ une étude au vibromètre laser à balayage a été réalisée (début du quatrième chapitre), qui permet non seulement de mettre en évidence pour la première fois les déformées de membrane complexes qui apparaissent en hautes fréquences, mais encore de les quantifier et par-delà de valider les résultats théoriques obtenus et donc les modèles proposés (même s’ils restent perfectibles comme indiqué dans la conclusion). / Condenser microphones are reciprocal transducers whose properties (sensitivity, bandwidth and reliability) make them powerful measurement tools. So far, they have been commonly used as receivers in the audible frequency range, in air at atmospheric pressure and ambient temperature, they have been appropriately characterised in this context for nearly thirty years. But nowadays, their miniaturisation (using MEMS processes) and their new use for metrological purposes (as receivers as well as transmitters) require much deeper theoretical and experimental characterisations because they require an accurate knowledge of their behaviour in high frequency ranges (up to 100 kHz), in gas mixtures, whose properties differ from those of air, and under pressure and temperature conditions much higher or much lower than standard conditions. Thus, here, -i/ the effects of the thermal boundary layers are introduced in the model (only viscous boundary layers are usually accounted for), leading, in the first chapter, to an analysis of the thermal diffusion of thin bodies (whose scope is beyond the strict frame of capacitive transducers), ii/ the influence of the holes in the backing electrode on the dynamic behaviour of the membrane is initially handled with an original analytical method which allows expressing the non-uniform boundary conditions at the surface of the backing electrode as fictitious localised sources associated to uniform boundary conditions (second chapter), -iii/ new analytical solutions, depending both on the radial and azimuthal coordinates, for the pressure field and for the displacement field inside the cavities behind the membrane are expressed using modal theories in agreement with the strong couplings which occur between the different parts of the transducer (chapter three), -iv/ "lumped element circuits", which are more or less approximated (presented in the Appendix), more particularly result in expressing and assessing the sensitivity and the thermal noise (end of chapter three), -v/ experimental results, obtained from measurements of the displacement field of the membrane using a laser scanning vibrometer, both highlight and quantify for the first time the complex behaviour of the membrane in the highest frequency range, and finally lead to the validation of the theoretical results and therefore, the models presented here (even if the latter may still be improved as outlined in the conclusion).