Thesis (Ph. D.)--University of Wisconsin--Madison, 1973. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliography.

Universiẗat, Diss., 2003--Bochum.

DAMASCENO, Filipe Francisco Rocha. Uma Melhoria no Algoritmo K-médias utilizando o Estimador de James-Stein. 63 f. 2015. Dissertação (Mestrado em Ciência da Computação)-Universidade Federal do Ceará, Fortaleza, 2015. / Submitted by Jairo Viana (jairo@ufc.br) on 2017-01-10T20:15:30Z No. of bitstreams: 1 2015_dis_ffrdamasceno.pdf: 966516 bytes, checksum: b1c373b2bf5b4b9a4e77e52d1f6a643c (MD5) / Approved for entry into archive by Jairo Viana (jairo@ufc.br) on 2017-01-10T20:15:44Z (GMT) No. of bitstreams: 1 2015_dis_ffrdamasceno.pdf: 966516 bytes, checksum: b1c373b2bf5b4b9a4e77e52d1f6a643c (MD5) / Made available in DSpace on 2017-01-10T20:15:44Z (GMT). No. of bitstreams: 1 2015_dis_ffrdamasceno.pdf: 966516 bytes, checksum: b1c373b2bf5b4b9a4e77e52d1f6a643c (MD5) Previous issue date: 2016 / The clustering task constitutes one of the main machine learning problems. Among many proposed methods, k-means stands out by its simplicity and high applicability. It is notorious that k-means performance is directly related to the centroid estimation from data, which is usually obtained from the maximum likelihood estimation (MLE). In previous studies it was proposed an estimator called James-Stein (JS) estimator, being, in average, capable of overcoming MLE for vectors of data with more than 2 dimensions. Also in previous studies it was proposed a variation of k-means applying JS estimator, obtaining improvements due to its better precision when compared to MLE. In this study we propose a variation of the k-means algorithm using the JS estimator. / A tarefa de agrupamento constitui um dos principais problemas de aprendizado de máquina. Dentre os diversos métodos propostos destaca-se o k-médias por sua simplicidade e grande aplicabilidade. É notório que o desempenho do k-médias está relacionado à estimativa dos centroides a partir dos dados e esta, usualmente, é obtida a partir da estimativa de máxima verossimilhança (EMV). Em trabalhos anteriores foi proposto um estimador denominado estimador de James-Stein (JS), sendo este capaz de, em média, superar o EMV para vetores de dados com dimensão maior que 2. Também em trabalhos anteriores foi proposta uma alteração do k-médias aplicando o estimador JS, obtendo melhoras devido à sua maior precisão em relação ao EMV. Neste trabalho propõe-se uma nova variante do algoritmo k-médias utilizando o estimador JS.

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ciências da Saúde, Programa de Pós-Graduação em Ciências da Saúde, 2015. / Submitted by Guimaraes Jacqueline (jacqueline.guimaraes@bce.unb.br) on 2016-03-15T14:11:59Z No. of bitstreams: 1 2015_ViniciusMedinaLopes.pdf: 1095876 bytes, checksum: 0ea020807ed4a39d86ba901916cbe944 (MD5) / Approved for entry into archive by Guimaraes Jacqueline(jacqueline.guimaraes@bce.unb.br) on 2016-03-15T14:12:36Z (GMT) No. of bitstreams: 1 2015_ViniciusMedinaLopes.pdf: 1095876 bytes, checksum: 0ea020807ed4a39d86ba901916cbe944 (MD5) / Made available in DSpace on 2016-03-15T14:12:36Z (GMT). No. of bitstreams: 1 2015_ViniciusMedinaLopes.pdf: 1095876 bytes, checksum: 0ea020807ed4a39d86ba901916cbe944 (MD5) / Introdução. A literatura médica é escassa no que se refere à avaliação da prevalência de hipovitaminose D no Brasil. Esta vitamina apresenta importante função em diversos processos metabólicos e lhe foi atribuída uma possível influência no processo reprodutivo e, em especial, na fisiologia reprodutiva da mulher. Não está esclarecido, entretanto, se existe associação entre concentrações séricas baixas de vitamina D e infertilidade feminina. Objetivos. Avaliar a prevalência de hipovitaminose D em mulheres inférteis e a relação da concentração sérica da vitamina D com os fatores de infertilidade. Métodos. Este é um estudo transversal de caso-controle. Os resultados das dosagens de vitamina D, realizadas entre primeiro de janeiro de 2012 e quinze de maio de 2012, foram o objeto desse estudo. A dosagem da vitamina D foi solicitada na primeira consulta para todas as pacientes inférteis em investigação, em um centro privado de reprodução assistida em Brasília, DF, Brasil. O grupo controle foi formado por mulheres atendidas nesta mesma clínica, sem queixas de infertilidade. Foi considerada deficiência de vitamina D quando a concentração da mesma estava abaixo de 20 ng/mL e insuficiência entre 20 e 30 ng/mL. Para analisar a influência da idade sobre a comparação entre as médias da concentração de vitamina D nos grupos foi realizado regressão logística de multivariáveis. Resultados. Entre as 369 mulheres avaliadas em idade fértil, 81,1% apresentaram algum grau de hipovitaminose D e, 32%, deficiência da vitamina. Não foi encontrada diferença entre a prevalência de deficiência de vitamina D nas pacientes inférteis (30,2%) e no grupo controle (35%) (p=0,33). Não se observaram diferenças significativas entre as médias das concentrações da vitamina D entre os grupos de inférteis (24,3 ± 7,9 ng/mL) e controles (23,8 ± 8,7 ng/mL) (p = 0,51). Não houve influência da idade nesse resultado. Não foi encontrada diferença estatística, quando se comparou as médias das concentrações de vitamina D de pacientes inférteis, de acordo com o fator de infertilidade, ou quando estas médias foram comparadas com o grupo controle. Conclusão. Concluímos que existe alta prevalência de hipovitaminose D nas mulheres inférteis consultadas. Não houve diferença na média das concentrações séricas entre as mulheres inférteis avaliadas e das mulheres sem esta queixa. Nenhum fator de infertilidade se associou a maior risco para que a mulher apresentasse concentrações mais baixas de vitamina D. ______________________________________________________________________________ ABSTRACT / Introduction. Publications about the prevalence of vitamin D deficiency in Brazilian population are rare. Vitamin D plays an important role in several metabolic processes, including a possible influence on women's reproductive physiology. Therefore, it is expected that the inadequate serum concentration of vitamin D might be involved with infertility factors. Objective. The aim of this study was to determine the prevalence of hypovitaminosis D in infertile patients that were examined at a clinic specialized in assisted reproduction in Brasilia, DF, Brazil. Our secondary objectives were to verify if serum concentrations of vitamin D in infertile women differ from those without infertility and to assess whether vitamin D serum concentration is influenced by the infertility factor. Methods. This is a cross-sectional case-control study. Vitamin D was measured from 01/01/2012 to 05/05/2012 in infertile women and in those without this complaint, who served as the control group. Subjects came from a private center of assisted reproduction, in Brasília-DF. Levels of vitamin D below 20 ng/mL were considered as deficiency, between 21 and 30 ng/mL as insufficiency, and normal when it was over 30 ng/mL. To analyze the vitamin D levels between controls and infertile women, adjusted by age, multivariate logistic regression was obtained. Results. Among the 369 women evaluated, 81.1% of them shown hypovitaminosis D and 32%, deficiency. There was no difference between the prevalence of vitamin D deficiency in infertile patients (30.2%) and in the control group (35%) (p = 0.33). The same occurred relatively to the mean vitamin D concentrations in infertile women (24.3 ± 7.9 ng/mL) and in the control group (23.8 ± 8.7 ng/mL) (p = 0.51), even when adjusted by age. Besides, there were no statistical differences in the mean vitamin D concentrations in infertile women when infertility factors were compared among them and also between each infertility factor group and the control group. Conclusions. It was observed a high proportion of infertile women with vitamin D deficiency. There was no difference between the prevalence of vitamin D deficiency in infertile patients and in the control group. There wasn’t an infertility factor associated to lower levels of vitamin D.

Die Thematik der Arbeit ist in der Schuranalysis angesiedelt. Angeregt durch die Bedurfnisse von Elektrotechnik und Signalubertragungstechnik entwickelte sich dieses mathematische Gebiet, welches Matrix- und Operatorversionen von Interpolations- und Momentenproblemen behandelt. Die vorliegende Dissertation beschafgt sich mit dem "J{Potapovproblem\, einem Interpolationsproblem furFu ntionen der J{Potapovklasse, welche in einer Umgebung von Null holomorph sind. Eine nahere Untersuchung dieser Funktionenklasse zeigt, dass deren Taylorkoe zientenfolgen zur Klasse der J{Potapovfolgen gehoren. Diese Folgen sind der Ausgangspunkt fur die Konstruktion von Matrixpolynomen, mit deren Hilfe sich die Losungsmenge des J{Potapovproblems als gebrochenlineare Transformation darstellen lasst. In Kapitel 1 werden zunachst J{Potapovfolgen und J{Potapovfunktion eingefuhrt sowie das J{Potapovproblem formuliert. Dabei werden wichtige Eigenschaften und Resulate vorgestellt sowie verdeutlicht, dass das J{Potapovproblem eine Verallgemeinerung des in der Literatur ausgiebig behandelten Schurproblems ist. Daraus entsteht die Zielstellung, wohlbekannte, aus Schurfolgen gebildete, Matrixpolynome auf den J{Potapovfall zu ubertragen. Eine besondere Rolle in der Losungsmenge des J{Potapovproblems spielt die zentrale J{ Potapovfunktion, denn eine Quotientendarstellung zentraler J{Potapovfunktionen ermoglicht auch eine Analyse der allgemeinen Losung. In Kapitel 2 erfolgt die Herleitung einer solchen Darstellung sowie die Untersuchung der damit verbundenen Folgen und Matrixpolynome. Dabei werden wichtige Identitaten und Beziehungen bewiesen, welche bei der Behandlung des J{Potapovproblems eine Schlusselrolle spielen. In Kapitel 3 erfolgt eine Verallgemeinerung der Arov{Krein{Matrixpolynome des Schurproblems auf die J{Potapovklasse. Dabei wird zunachst der nichtdegenerierte Fall untersucht, bevor eine Erweiterung der Ergebnisse auf den degenerierten Fall vorgenommen wird. Ausgangspunkt fur die Untersuchungen des vierten Kapitels ist die Beobachtung, dass mit den gegebenen Daten eines J{Potapovproblems ein spezielles Stein-Tripel und damit im nichtdegenerierten Fall ein J (:= diag(J;

This thesis contains two main chapters. The first chapter focuses on the highdimensional asymptotic regimes of correlated Wishart matrices d−1YY^T , where Y is a n×d Gaussian random matrix with correlated and non-stationary entries. We provide quantitative bounds in the Wasserstein distance for the cases of central convergence and non-central convergence, verify such convergences hold in the weak topology of C([a; b]; M_n(R)), and show that our result can be used to prove convergence in expectation of the empirical spectral distributions of the Wishart matrices to the semicircular law. The second chapter develops a version of the Stein-Malliavin method in an infinite-dimensional and non-diffusive Poissonian setting. In particular, we provide quantitative central limit theorems for approximations by non-degenerate Hilbert-valued Gaussian random elements, as well as fourth moment bounds for approximating sequences with finite chaos expansion. We apply our results to the Brownian approximation of Poisson processes in Besov-Liouville spaces and also derive a functional limit theorem for an edge-counting statistic of a random geometric graph.

Thesis--Tübingen. / Vita. Bibliography: p. 199-220a.

Prenant pour point de départ le corps pour l’examiner au prisme de la technologie, cette études’intéresse aux représentations du corps dans quatre textes majeurs de Djuna Barnes et de GertrudeStein. Dans The Book of Repulsive Women de Barnes, les corps fragmentés décrits dans les poèmesdialoguent avec les représentations mécanomorphiques du corps féminins chez les Dadaïstes. Lerecueil s’apparente à une série de tableaux vivants exhibant des corps mécanisés vus depuis les ramesdu métro aérien new-yorkais. La discussion envisage ensuite Dr. Faustus Lights the Lights de Stein etles connections entre la métaphore de l’électricité et l’écriture cinématique de Stein. Le lien entre cespratiques est l’automatisme que Stein a étudié chez William James et qui transforme son texte en corpsautomate. Dans cette perspective, Wars I Have Seen de Stein constitue une expérience linguistique àcomparer avec l’écriture conceptuelle de Bob Carlton Brown. Chirurgienne littéraire, Stein opère letexte à l’aide de prothèses verbales. La dernière oeuvre étudiée dans cette thèse est The Antiphon deBarnes, qui est lue à l’aide de la relation conceptuelle entre le corps violenté de Barnes et le corps dutexte autobiographique, et peut être décodée à l’analyse de ses procédés métadramatiques. Dans ledernier chapitre, les deux auteurs sont repensées à l’aulne de leur incarnation personnelle dans leurstextes et des diverses manifestations de la notion du corps et de celle de la technologie. / Having as a starting point the theme of the body and exploring it through the prism oftechnology, this study depicts its representations in four major texts by Djuna Barnes and GertrudeStein. Starting with Barnes’s The Book of Repulsive Women, the fragmented bodies depicted in thepoems come in dialogue with Dadaists’ mechanomorphic representations of female bodies. Thecollection is seen as a series of tableaux vivants displaying mechanized bodies through the alteringpresence of the El. The discussion, then, moves on to Stein’s Dr. Faustus Lights the Lights andconnections are drawn between the metaphor of electricity and Stein’s cinematic writing. The linkingaspect of this association is the practice of “automatism” that Stein explored through William James,which leads to the point that her work is an “automaton” body of text. Following this, Stein’s Wars IHave Seen, is examined as a linguistic experiment compared to Bob Carlton Brown’s conceptualwriting. Stein as a linguistic surgeon operates on the text’s body with the help of word prosthesis. Thelast work in this study is Barnes’s The Antiphon, which is explored via the conceptual correlation ofBarnes’s violated body with her autobiographical textual body, examined through decoding Barnes’smetatheatrical devices. In the final chapter, these two writers are reexamined through their personalembodiment in the texts and through the various manifestations of the themes of body and technology.

La géométrie symplectique et la géométrie complexe sont intimement liées, en particulier par les techniques asymptotiquement holomorphes de Donaldson et Auroux d'une part et par les travaux d’Eliashberget et Cieliebak sur la pseudoconvexité d'autre part. Les travaux présentés dans cette thèse sont motivés par ces deux liens. On donne d’abord la caractérisation symplectique suivante des constantes de Seshadri. Dans une variété complexe, la constante de Seshadri d’une classe de Kähler entière en un point est la borne supérieure des capacités de boules standard admettant, pour une certaine forme de Kähler dans cette classe, un plongement holomorphe et iso-Kähler de codimension 0 centré en ce point. Ce critère était connu de Eckl en 2014 ; on en donne une preuve différente. La deuxième partie est motivée par la question suivante de Donaldson : <<Toute sphère lagrangienne d'une variété projective complexe est-elle un cycle évanescent d'une déformation complexe vers une variété à singularité conique ?>> D'une part, on présente toute sous-variété lagrangienne close d’une variété symplectique/kählérienne close dont les périodes relatives sont entières comme lieu des minima d’une exhaustion <<convexe>> définie sur le complémentaire d'une section hyperplane symplectique/complexe. Dans le cadre kählérien, <<convexe>> signifie strictement plurisousharmonique tandis que dans le cadre symplectique, cela signifie de Lyapounov pour un champ de Liouville. D'autre part, on montre que toute sphère lagrangienne d'un domaine de Stein qui est le lieu des minima d’une fonction <<convexe>> est un cycle évanescent d'une déformation complexe sur le disque vers un domaine à singularité conique. / Symplectic geometry and complex geometry are closely related, in particular by Donaldson and Auroux’s asymptotically holomorphic techniques and by Eliashberg and Cieliebak’s work on pseudoconvexity. The work presented in this thesis is motivated by these two connections. We first give the following symplectic characterisation of Seshadri constants. In a complex manifold, the Seshadri constant of an integral Kähler class at a point is the upper bound on the capacities of standard balls admitting, for some Kähler form in this class, a codimension 0 holomorphic and iso-Kähler embedding centered at this point. This criterion was known by Eckl in 2014; we give a different proof of it. The second part is motivated by Donaldon’s following question: ‘Is every Lagrangian sphere of a complex projective manifold a vanishing cycle of a complex deformation to a variety with a conical singularity?’ On the one hand, we present every closed Lagrangian submanifold of a closed symplectic/Kähler manifold whose relative periods are integers as the lowest level set of a ‘convex’ exhaustion defined on the complement of a symplectic/complex hyperplane section. In the Kähler setting ‘complex’ means strictly plurisubharmonic while in the symplectic setting it refers to the existence of a Liouville pseudogradient. On the other hand, we prove that any Lagrangian sphere of a Stein domain which is the lowest level-set of a ‘convex’ function is a vanishing cycle of some complex deformation over the disc to a variety with a conical singularity.

This thesis examines the publishing career of Gertrude Stein, an American expatriate writer whose experimental style left her largely unpublished throughout much of her career. Stein’s various attempts at dissemination illustrate the importance she placed on being paid for her work and highlight the paradoxical relationship between Stein and her audience. This study shows that there was an intimate relationship between literary modernism and mainstream culture as demonstrated by Stein’s need for the public recognition and financial gains by which success had long been measured. Stein’s attempt to embrace the definition of the author as a professional who earned a living through writing is indicative of the developments in art throughout the first decades of the twentieth century, and it problematizes modern authorship by reemphasizing the importance of commercial success to artists previously believed to have been indifferent to the reaction of their audience. / iv, 89 leaves ; 29 cm