Nous étudions certains processus de Lévy à valeurs dans les groupes d'isométries respectifs des espace-temps de Minkowski, de De Sitter et de Anti-De-Sitter. Le groupe d'isométries est vu comme le fibré des repères de l'espace-temps et les processus de Lévy considérés se projettent sur le fibré unitaire en un processus markovien relativiste ; c'est-à-dire que les trajectoires dans l'espace-temps sont de genre temps et que le générateur est invariant par les isométries. Dans la première partie nous adaptons pour les diffusions hypoelliptiques générales un résultat de Ben Arous et Gradinaru concernant la singularité de la fonction de Green hypoelliptique. Nous déduisons de cela un critère d'effilement de Wiener local pour les diffusions relativistes dans le groupe de Poincaré, groupe des isométries de l'espace-temps de Minkowski. Dans les deux dernières parties nous nous intéressons au comportement asymptotique du flot stochastique associé à ces processus de Lévy dans les différents groupes d'isométries. Sous une condition d'intégrabilité de la mesure de Lévy nous calculons explicitement les coefficients de Lyapounov des processus dans le groupe de Poincaré. Nous effectuons un travail similaire pour les espace-temps de De Sitter et Anti-De-Sitter en nous limitant au cas des diffusions. Nous explicitons de plus la frontière de Poisson pour la diffusion dans le groupe d'isométries de l'espace-temps de De Sitter.

This thesis for the Master of Architecture degree focuses on urban renewal, in particular on revitalization of run down inner city neighborhoods. My chosen site is the area outside the main station in Dresden currently a wide open field with a monument of Lenin. It forms an important entry to the city center, to which it connects via the Prager StraBe, once a proud and glamorous shopping street, now a uninviting, wind-swepted pedestrian zone. This area was heavily destroyed (95°x) through Allied bombing on February 13, 1945. The reconstruction after the war disregarded the context more or less completely and was executed in a modernist town planning style which disregards of the history of the place and human scale.The analytical part deals with the existing structures, spaces and services. A catalogue of problems was established in order to be able to discuss objectives and propose strategies for possible solutions. As a result, I developed the program for the scheme.The creative project attempts to solve these problems: the urban form, the reduced density, the traffic situation, the pedestrian zone etc. and demonstrate a reasonable design solution for the area. It consists of a hotel, a convention center, a administration center, various mixed use buildings with retail at ground floor, office units above and residential penthouses. The design for the hard landscaping of the square and the soft landscaping for the public gardens helps to define the public realm. An anticipated future metro station is linked to a underground shopping arcade and to the new station concourse. / Department of Architecture

<p>The period following the Second World War in Austria represents a unique historical situation. On the one hand, strongly conservative and restaurative trends in politics, publications, media, and social life dominated the country - at the same time, a radically new avant-garde movement emerged. What today is collectively referred to as the Wiener Gruppe was, in the 1950s, a circle of young writers, connected by friendship and collaboration with the filmmakers Kurt Kren and Peter Kubelka. These artists created experimental works that pre-empt the concept of performance art established at a theoretical level two decades later, and anticipate the re-conceptualization of the role of the reader theorized by Roland Barthes and Michel Foucault in the 1960s. </p><p>In this dissertation, I outline the socio-political situation in Austria during the years following World War Two in Chapter One and discuss the key concepts and works which are relevant for the understanding of experimental literature and film in Chapter Two and Three. I demonstrate that the radical experimentation of postwar experimental authors and filmmakers draws attention to the materiality, visuality, and performativity of their works and establishes experimental literature and film as individual art forms: writing-as-writing and film-as-film. In conclusion, I argue that their works represent an implicit critique of language, culture, and society in the context of the "grand narratives" or the "invisible structurations" supporting a post-World War Two Austrian society.</p><p>In this dissertation, I will outline the socio-political situation in Austria during the years following World War Two in Chapter One, and discuss the key concepts which are relevant for the understanding of experimental literature in Chapter Two and Three. I will demonstrate that the radical experimentation of postwar experimental authors and filmmakers draws attention to the materiality, visuality, and performativity and establishes experimental literature and film as individual art forms: writing-as-writing and film-as-film. In conclusion, I argue that their works represent an implicit critique of language, culture, and society in the context of the "grand narratives," the "invisible structurations" which support society.</p> / Dissertation

General anesthesia is a drug-induced reversible state where neuromuscular blockade (NMB), hypnosis, and analgesia (jointly denoted by depth of anesthesia - DoA) are guaranteed. This thesis concerns mathematical modeling and feedback control of the effect of the muscle relaxants atracurium and rocuronium, the hypnotic propofol, and the analgesic remifentanil. It is motivated by the need to reduce incidences of awareness and overdose-related post-operative complications that occur in standard clinical practice. A major challenge for identification in closed-loop is the poor excitation provided by the feedback signal. This applies to the case of drugs administered in closed-loop. As a result, the standard models for the effect of anesthetics appear to be over-parameterized. This deteriorates the result of system identification and prevents individualized control. In the first part of the thesis, minimally parameterized models for the single-input single-output NMB and the multiple-input single-output DoA are developed, using real data. The models have a nonlinear Wiener structure: linear time-invariant dynamics cascaded with a static nonlinearity. The proposed models are shown to improve identifiability as compared to the standard ones. The second part of the thesis presents system identification methods for Wiener systems: a batch prediction error method, and two recursive techniques, one based on the extended Kalman filter, and another based on the particle filter. Algorithms are given for both the NMB and the DoA using the minimally parameterized models. Nonlinear adaptive controllers are proposed in the third part of the thesis. Using the model parameter estimates from the extended Kalman filter, the controller performs an online inversion of the Wiener nonlinearity. A pole-placement controller or a linear quadratic Gaussian controller is used for the linearized system. Results show good reference tracking performance both in simulation and in real trials. Relating to patient safety, the existence of undesirable sustained oscillations as consequence of Andronov-Hopf bifurcations for a NMB PID-controlled system is analyzed. Essentially the same bifurcations are observed in the standard and the minimally parameterized models, confirming the ability of the latter to predict the nonlinear behavior of the closed-loop system. Methods to design oscillation-free controllers are outlined.

By taking into account various published fragments, concepts and the final 'Volksstuck' this thesis attempts to show how the playwright Odon von Horvath developed the characters of his commercially successful 'Volksstuck' "Tales From The Vienna Woods". Chapter one of this thesis includes a brief biography of Horvath. The second chapter comprises a short history of the 'Volksstuck', Horvaths interpretation of the genre and its implications for his plays as well as a summary of the final version "'Geschichten aus dem Wiener Wald.' Volksstuck in drei Teilen." The thesis further attempts to recreate a genealogy of the dramatic characters Zauberkonig, Alfred, Marianne and Oskar and to give possible reasons for their dramaturgical changes up to the development of the final version. In addition the thesis concerns itself with one example for the development of stage directions. Political as well as religious implications are considered alone and in connection with the characters.

Texte remanié: Diss.--Frankfurt am Main--Johan Wolfang Goethe universitât, 1993. / Bibliogr. p. 85-95.

In this thesis we study the spaces of Gevrey functions and ultradistributions, focusing primarily on the properties reflected on their Fourier-Laplace transforms. In particular, we study the Paley-Wiener Theorems for compactly supported Gevrey functions and compactly supported Gevrey ultradistributions.

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica. / Made available in DSpace on 2012-10-26T07:46:25Z (GMT). No. of bitstreams: 1 301279.pdf: 1226847 bytes, checksum: 0cb0c2277bd8cd20a78359b2dd08d11a (MD5) / Muitas técnicas de redução de ruído, especialmente a filtragem de Wiener, sofrem com a introdução de ruído musical e distorção do sinal de voz em SNRs baixas devido às suas funções ganho rígidas. Neste trabalho propomos uma modificação do filtro de Wiener paramétrico para enfatizar as contribuições espectrais nas regiões do espectro que são importantes para inteligibilidade. Isto é feito definindo um parâmetro adaptativo que é uma função do pitch. Medidas objetivas e testes estatísticos são usados para avaliar a qualidade subjetiva e inteligibilidade do sinal de voz. Os resultados indicam que o algoritmo proposto resulta na melhora da inteligibilidade e redução do ruído musical do sinal de voz processado, comparado com o filtro de Wiener convencional. / Many existing speech enhancement techniques, especially Wiener filtering, suffer from introducing annoying musical noise and speech distortion in low SNR due to their rigid gain functions. In this work we propose a modification to the parametric Wiener filter that emphasizes the spectral contributions in spectral regions which are important for intelligibility. This is done by defining an adaptive parameter that is a function of the pitch. Objective measures and statistical tests are used to assess subjective speech quality and intelligibility. The results indicate that the proposed algorithm results in speech intelligibility improvement and in musical noise reduction, as compared to the conventional Wiener filter.

Submitted by VIVIANE HENGLER CORRÊA CHAVES null (viviane.hcc@bol.com.br) on 2016-10-19T15:16:02Z No. of bitstreams: 1 tese_norbert_wiener.pdf: 1686773 bytes, checksum: ca5f2d9e600132270f3a972edb9b0b6a (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-10-25T13:48:26Z (GMT) No. of bitstreams: 1 chaves_vhc_dr_rcla.pdf: 1686773 bytes, checksum: ca5f2d9e600132270f3a972edb9b0b6a (MD5) / Made available in DSpace on 2016-10-25T13:48:26Z (GMT). No. of bitstreams: 1 chaves_vhc_dr_rcla.pdf: 1686773 bytes, checksum: ca5f2d9e600132270f3a972edb9b0b6a (MD5) Previous issue date: 2016-09-19 / Esta tese parte do seguinte problema de pesquisa - quais conhecimentos e experiências levaram o matemático Norbert Wiener a desenvolver a sua teoria cibernética e quais as consequências decorrentes desse modo sistêmico de pensamento? Como objetivo geral pretendeu-se elaborar uma reconstituição histórica do surgimento e evolução da Teoria Cibernética, por meio da história de seu idealizador, Norbert Wiener, de modo a compreender as ideias que o levaram à construção de sua teoria. Integra o escopo deste trabalho entender a lógica matemática que levou Wiener a conceber sua teoria cibernética e, também, a sua teoria da comunicação; relacionar os aspectos técnicos e sua abrangência, bem como a problemática, social e científica, que a Cibernética impõe ao mundo contemporâneo. O locus temporal desta pesquisa delimita-se, historicamente, entre 1894 e 1964, anos relativos ao nascimento e morte de Norbert Wiener, respectivamente. Busca-se construir uma história não se atendo somente às obras e documentos de Wiener, os fatos descritos, mas também compreender as relações que se deram por meio dos fatos, suas problematizações e seu contexto histórico. Para tanto, utilizou-se da pesquisa bibliográfica e documental baseada nas obras e documentos de Norbert Wiener. Em síntese, as considerações finais apontam que a cibernética tem como característica fundamental a interdisciplinaridade e abrange todo o campo da teoria do comando, controle e transmissão de informações. Destaca-se, ainda, a influência marcante da trajetória profissional e pessoal de Wiener para o desenvolvimento da sua Teoria Cibernética. / This thesis of the following research problem - what knowledge and experiences have led the mathematician Norbert Wiener to develop their cybernetic theory and what the consequences of systemic way of thinking? As a general objective was intended to establish a historical reconstruction of the emergence and evolution of Cybernetics Theory, through the story of its creator, Norbert Wiener, so as to understand the ideas that led to the construction of his theory. The scope of this paper too search understand the mathematical logic that led Wiener to design their cybernetic theory and also its communication theory; relate the technical aspects and its comprehensiveness as well as the problems, and social science, the cybernetics require the contemporary world. The temporal locus of this research is delimited historically, between 1894 and 1964, years for the birth and death of Norbert Wiener, respectively. Seeks to build a story, not only attend to the works and Wiener documents, the facts described, but also understand the relationships that occurred through the facts, their problematizations and its historical context. For that, we used the bibliographical and documentary research based on the works and documents of Norbert Wiener. In summary, the conclusions point cybernetic has the fundamental characteristic the interdisciplinarity and comprise the entire field of the theory of command, control and transmission of information. It is noteworthy also the strong influence of the personal and professional trajectory of Wiener to the development of its Cybernetics Theory.

Orientadores: Djairo Guedes de Figueiredo, Francisco Odair de Paiva / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-10T16:14:26Z (GMT). No. of bitstreams: 1 Presoto_AdilsonEduardo_M.pdf: 798633 bytes, checksum: be0d791852ff6c964303c43174b753c4 (MD5) Previous issue date: 2008 / Resumo: Abordaremos diferentes métodos da Teoria do Potencial desenvolvidos no fim do século XIX e no começo do século XX para solucionar o Problema de Dirichlet. Iniciamos o primeiro capítulo com o Método da Varredura de Poincaré que transcendeu os anteriores e focalizou o problema sob uma nova óptica. Neste método, uma função harmônica, num domínio geral, era obtida, uma vez que condição de contorno fosse dada. Então condições na fronteira eram analizadas afim de que a função harmônica fosse, de fato, a solução do Problema de Dirichlet. Até então, as principais resoluções se baseavam no Princípio de Dirichlet que admitia soluções minimizantes para integrais de energia, se fundamentando em argumentos físicos. Contudo, tais argumentos continham alguns deslizes matemáticos como a admissão do mínimo para essas integrais. Posteriormente, surgiram os métodos de Perron e de Wiener dentro do espírito o Método do Poincaré. Ainda no primeiro capítulo, apresentamos um antecessor do método de Poincaré: o "Método de Schwarz. O segundo capítulo é dedicado ao Método das Equações Intregrais de Fredholm, no qual a Análise FUncional e as Equações Diferenciais Parciais caminharam lado a lado. Por fim, no último capítulo temos um resultado devido a Wiener que caracteriza os pontos regulares em termos de convergência de uma série envolvendo a capacidade de alguns conjuntos / Abstract: We will present different methods of Potential Theory developed at the end of the nineteenth century and the beginning of the twentieth century to solve the Dirichlet Problem. We start in the first chapter, with the Poincaré's Sweepping out Method, which transcended the former ones and focused the problem in a new insight. In this method, a harmonic function in a general domain is obtained, once a boundary condition is given. Then, conditions in the boundary are discussed so that this harmonic function is indeed the solution of the Dirichlet Problem. Until then, the key results were based on Dirichlet PrincipIe which admitted minimizing solutions to energy integraIs, by using some physical arguments. However, such arguments contained a few Mathematical gaps like the admission of a minimun to these integrals. Later, it appeared the Perron and Wiener Methods in the spirit of the Poincaré Method. Even in the first chapter, we discuss a predecessor of Poincaré's Method: the Schwarz's Method. The second chapter is devoted to the Integral Equations Method, where the Functional Analysis and Differential Equations walked side by side. Finally, the last chapter is a result due to Wiener that characterizes the regular points in terms of covergence of a series involving the capacity of some sets / Mestrado / Matematica - Analise- Equações Diferenciais e Parciais / Mestre em Matemática