• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 213
  • 65
  • 53
  • 7
  • 4
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 389
  • 150
  • 105
  • 76
  • 56
  • 56
  • 53
  • 49
  • 49
  • 48
  • 46
  • 43
  • 43
  • 36
  • 36
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
291

A Comparison of Random Walks with Different Types of Acceptance Probabilities

Fachat, André 19 March 2001 (has links) (PDF)
In this thesis random walks similar to the Metropolis algorithm are investigated. Special emphasis is laid on different types of acceptance probabilities, namely Metropolis, Tsallis and Threshold Accepting. Equilibrium and relaxation properties as well as performance aspects in stochastic optimization are investigated. Analytical investigation of a simple system mimicking an harmonic oscillator yields that a variety of acceptance probabilities, including the abovementioned, result in an equilibrium distribution that is widely dominated by an exponential function. In the last chapter an optimal optimization schedule for the Tsallis acceptance probability for the idealized barrier is investigated. / In dieser Dissertation werden Random Walks ähnlich dem Metropolis Algorithmus untersucht. Es werden verschiedene Akzeptanzwahrscheinlichkeiten untersucht, dabei werden Metropolis, Tsallis und Threshold Accepting besonders betrachtet. Gleichgewichts- und Relaxationseigenschaften sowie Performanceaspekte im Bereich der stochastischen Optimierung werden untersucht. Die Analytische Betrachtung eines simplen, dem harmonischen Oszillator ähnlichen Systems zeigt, dass eine Reihe von Akzeptanzwahrscheinlichkeiten, eingeschlossen die oben Erwähnten, eine Gleichgewichtsverteilung ausbilden, die von einer Exponentialfunktion dominiert wird. Im letzten Kapitel wird der optimale Schedule für die Tsallis Akzeptanzwahrscheinlichkeit für eine idealisierte Barriere untersucht.
292

Additive Latent Variable (ALV) Modeling: Assessing Variation in Intervention Impact in Randomized Field Trials

Toyinbo, Peter Ayo 23 October 2009 (has links)
In order to personalize or tailor treatments to maximize impact among different subgroups, there is need to model not only the main effects of intervention but also the variation in intervention impact by baseline individual level risk characteristics. To this end a suitable statistical model will allow researchers to answer a major research question: who benefits or is harmed by this intervention program? Commonly in social and psychological research, the baseline risk may be unobservable and have to be estimated from observed indicators that are measured with errors; also it may have nonlinear relationship with the outcome. Most of the existing nonlinear structural equation models (SEM’s) developed to address such problems employ polynomial or fully parametric nonlinear functions to define the structural equations. These methods are limited because they require functional forms to be specified beforehand and even if the models include higher order polynomials there may be problems when the focus of interest relates to the function over its whole domain. To develop a more flexible statistical modeling technique for assessing complex relationships between a proximal/distal outcome and 1) baseline characteristics measured with errors, and 2) baseline-treatment interaction; such that the shapes of these relationships are data driven and there is no need for the shapes to be determined a priori. In the ALV model structure the nonlinear components of the regression equations are represented as generalized additive model (GAM), or generalized additive mixed-effects model (GAMM). Replication study results show that the ALV model estimates of underlying relationships in the data are sufficiently close to the true pattern. The ALV modeling technique allows researchers to assess how an intervention affects individuals differently as a function of baseline risk that is itself measured with error, and uncover complex relationships in the data that might otherwise be missed. Although the ALV approach is computationally intensive, it relieves its users from the need to decide functional forms before the model is run. It can be extended to examine complex nonlinearity between growth factors and distal outcomes in a longitudinal study.
293

Estimation bayésienne nonparamétrique de copules

Guillotte, Simon January 2008 (has links)
Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal
294

Analysis Of Stochastic And Non-stochastic Volatility Models

Ozkan, Pelin 01 September 2004 (has links) (PDF)
Changing in variance or volatility with time can be modeled as deterministic by using autoregressive conditional heteroscedastic (ARCH) type models, or as stochastic by using stochastic volatility (SV) models. This study compares these two kinds of models which are estimated on Turkish / USA exchange rate data. First, a GARCH(1,1) model is fitted to the data by using the package E-views and then a Bayesian estimation procedure is used for estimating an appropriate SV model with the help of Ox code. In order to compare these models, the LR test statistic calculated for non-nested hypotheses is obtained.
295

Quinta de recreio do Paço Episcopal de Castelo Branco-memórias e contributos

Ferreira, Elisabete Moura Lopes Barreiros January 2001 (has links)
No description available.
296

Hybrid Simulation Methods for Systems in Condensed Phase

Feldt, Jonas 08 March 2018 (has links)
No description available.
297

A rela??o urbano-rural no contexto da metr?pole: um enfoque nos assentamentos rurais da RMN

Lopes, Rosa Maria Rodrigues 13 October 2008 (has links)
Made available in DSpace on 2015-03-13T17:10:32Z (GMT). No. of bitstreams: 1 RosaMRL.pdf: 2199929 bytes, checksum: 02ac35a2567415e00d4182ce724898dd (MD5) Previous issue date: 2008-10-13 / The work however presented try to make an analysis of the relation urban-agricultural in the context of the process of metropolization of Natal. On the basis of this approach searched to argue the estruturation of the Brazilian urban space and the relation with the agricultural one, evidencing an academic debate little contemplated, in view of that the space transformations guided by Brazilian industrialization had earned as endorsement a mere urban direction, fact that neglected factors more complex than they for the urban-agricultural relation in the context of the urbanization and, more recently, of the metropolization. Another important factor in the construction of the work was the contextualization of the urbanization of the Rio Grande do Norte, as well as of the metropolization of Natal, where if the significant presence of an agricultural reality made an analysis of the configuration metropolitan in the present time displaying that also remains and reproduces the metropolis, fact that conditions and justifies the treatment of the reality metropolitan for the bias of the urban-agricultural relation. The approach of this relation was directed for the agricultural nestings of the Region Metropolitan of Natal (RMN), understood as fragments agricultural in the context of the metropolis, in view of that a tenuous correspondence of these nestings with the metropolis in the direction of its integration was observed. As methodology one used bibliographical survey in periodic and books and collected secondary data-collecting next to the IBGE and to the INCRA and still were directed a field research where interviews next to the seated ones had been carried through. In this direction, one evidenced that the metropolization also absorbs and even though it reproduces the ruralidade that if verifies in the RMN finishing for mining the idea of an urban one that it excludes the agricultural one. In the case of the RMN, we have agricultural and the urban one exactly if conforming in one space that is metropolitan / O trabalho ora apresentado busca fazer uma an?lise da rela??o urbano-rural no contexto do processo de metropoliza??o de Natal. Com base nesse enfoque buscou-se discutir a estrutura??o do espa?o urbano brasileiro e sua rela??o com o rural, evidenciando um debate acad?mico pouco contemplado, tendo em vista que as transforma??es espaciais orientadas pela industrializa??o brasileira ganharam como respaldo um sentido meramente urbano, fato que negligenciou fatores mais complexos que perpassam pela rela??o urbano-rural no contexto da urbaniza??o e, mais recentemente, da metropoliza??o. Outro fator importante na constru??o do trabalho foi a contextualiza??o da urbaniza??o do Rio Grande do Norte, assim como da metropoliza??o de Natal, onde se fez uma an?lise da configura??o metropolitana na atualidade expondo a presen?a significativa de uma realidade rural que inclusive se mant?m e reproduz a metr?pole, fato que condiciona e justifica o tratamento da realidade metropolitana pelo vi?s da rela??o urbano-rural. O enfoque dessa rela??o foi direcionado para os assentamentos rurais da Regi?o Metropolitana de Natal (RMN), entendidos como fragmentos rurais no contexto da metr?pole, tendo em vista que foi observada uma t?nue correspond?ncia desses assentamentos com a metr?pole no sentido de sua integra??o. Como metodologia utilizou-se levantamento bibliogr?fico em peri?dicos e livros e levantamento de dados secund?rios coletados junto ao IBGE e ao INCRA e ainda foi encaminhada uma pesquisa de campo onde foram realizadas entrevistas junto aos assentados. Nesse sentido, constatou-se que a metropoliza??o tamb?m absorve e at? mesmo reproduz a ruralidade que se verifica na RMN acabando por minar a id?ia de um urbano que exclui o rural. No caso da RMN, temos o rural e o urbano se conformando num mesmo espa?o que ? metropolitano
298

Modelagem estoc?stica da distribui??o de probabilidade da precipita??o pluvial via m?todos computacionalmente intensivos

Santos, Marconio Silva dos 24 November 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-03-21T12:37:29Z No. of bitstreams: 1 MarconioSilvaDosSantos_TESE.pdf: 17070388 bytes, checksum: 46702d837c8c304ffc379088625742aa (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-03-23T15:26:03Z (GMT) No. of bitstreams: 1 MarconioSilvaDosSantos_TESE.pdf: 17070388 bytes, checksum: 46702d837c8c304ffc379088625742aa (MD5) / Made available in DSpace on 2018-03-23T15:26:03Z (GMT). No. of bitstreams: 1 MarconioSilvaDosSantos_TESE.pdf: 17070388 bytes, checksum: 46702d837c8c304ffc379088625742aa (MD5) Previous issue date: 2017-11-24 / Neste trabalho, ? feita uma modelagem estat?stica da precipita??o pluvial. Este ? um trabalho metodol?gico que utiliza simula??es estoc?sticas para estimar as distribui??es de probabilidades envolvidas na modelagem dessa vari?vel atmosf?rica. A fim de estimar os par?metros dessas distribui??es, foram utilizados m?todos de Monte Carlo via cadeias de Markov para gerar amostras sint?ticas de tamanho grande a partir de dados observados. Os m?todos utilizados foram o algoritmo de Metropolis-Hastings e o amostrador de Gibbs. As simula??es foram feitas sob a hip?tese de que os dias de um mesmo per?odo do ano (m?s ou esta??o chuvosa) podem ser considerados como identicamente distribu?dos em rela??o ? probabilidade de ocorrer precipita??o. Essa pesquisa possibilitou a produ??o de quatro artigos. O primeiro artigo utilizou o algoritmo de Metropolis-Hastings para modelar a probabilidade de ocorr?ncia de precipita??o em um dia qualquer do m?s. As simula??es desse artigo foram feitas com dados observados de algumas cidades brasileiras. Os demais artigos utilizaram o amostrador de Gibbs e os m?todos propostos foram aplicados em cidades da regi?o Nordeste do Brasil. No segundo artigo, as distribui??es Beta e Binomial foram utilizadas para modelar o n?mero de dias do m?s com ocorr?ncia de precipita??o. No terceiro artigo, a distribui??o de Poisson foi utilizada para modelar o n?mero de dias com valores extremos de precipita??o na esta??o chuvosa. Um m?todo alternativo para estimar esses valores extremos e sua distribui??o ? apresentado no quarto artigo, utilizando a distribui??o Gama. De acordo com os resultados dessas pesquisas, amostrador de Gibbs foi considerado adequado para estimar as distribui??es na modelagem da precipita??o em cidades para as quais h? poucos dados hist?ricos. / In this work, it was made a statistical modeling of precipitation. This is a methodological work that uses stochastic simulations to estimate the probability distributions related to this atmospheric variable. In order to estimate the parameters of these distributions, Markov chain Monte Carlo methods were used to generate large size synthetic samples from observed data. The used methods were the Metropolis-Hastings algorithm and the Gibbs sampler. The simulations were performed under the hypothesis that the days of of the same period of the year (month or rainy season) can be considered to be identically distributed concernig the probability of precipitation. This research allowed the production of four papers. The first paper used the Metropolis-Hastings algorithm to model the probability of occurrence of precipitation on any day of the month. The simulations of this paper were perfomed with observed data of some Brazilian cities. The other papers used the Gibbs sampler and the proposed methods were applied to data from cities in the Northeast Brazil. In the second paper, Beta and Binomial distributions were used to model the number of days of the month with occurrence of precipitation. In the third paper, the Poisson distribution was used to model the number of days with precipitation extreme values in the rainy season. An alternative method for estimating these extreme values and their distribution is presented in the fourth paper, using the Gamma distribution. According to the results obtained by these researches, the Gibbs sampler was considered to be adequate to estimate distributions in the modeling of precipitation on cities for which there are few historical data.
299

A metrópole em cena: As metáforas do teatro e do cinema em Cidade de Vidro de Paul Auster e Sinédoque Nova York de Charlie Kaufman / The metropolis on the scene: the metaphors of theatre and cinema in City of Glass by Paul Auster and Synecdoche New York by Charlie Kaufman

Anna Carolina de Azevedo Caramuru 29 March 2011 (has links)
A metáfora do mundo como um palco está presente no imaginário humano há muitos séculos, o que se pode ver nas obras artísticas e filosóficas, de Cícero a Shakespeare: o mundo é representação. O presente estudo propõe-se a analisar interdisciplinamente os desdobramentos das metáforas do teatro e do cinema, na exploração do espaço da metrópole, tendo como corpus o romance Cidade de Vidro, de Paul Auster (1999) e a narrativa fílmica Sinédoque Nova York, de Charlie Kaufman (2008). Para tal, procuramos os teóricos da metáfora, tendo como principal deles Hans Blumenberg, fundador da Metaforologia, Paul Ricoeur e Derrida, em estudos especialmente dedicados a essa figura de linguagem. As metáforas, contudo, se realizam em um determinado espaço, o da metrópole, e para nos guiarmos em seus caminhos, elegemos os estudiosos da nova geografia cultural, dentre os quais Paul Claval, Mathias Le Bossé e Denis Cosgrove. Na correlação da cidade com o teatro, apontaremos a própria história da criação do teatro ocidental como o principal ponto de partida para as ramificações de tal mimetismo. Para o estudo específico do espaço da metrópole, contamos com Walter Benjamin e seus seguidores. Os estudos benjaminianos serão também de vital importância para a compreensão da relação entre cinema e metrópole, relação essa que também foi aclarada pelo questionamento de Nietzsche sobre a verdade. Não foi nossa intenção comparar as obras aqui analisadas em seus planos narratológicos, mas articular dois textos regidos por códigos e procedimentos artísticos parecidos, mas, ainda assim diferentes. Buscamos apontar como as relações teatrais e cinemáticas na metrópole, fragmentada como o próprio homem que nela se perde, provocam uma suspensão da fronteira entre realidade e ficção / The metaphor of the world as a stage has been present in human imagination for centuries. This can be seen in the artistic and philosophical works from Cicero to Shakespeare: the world is representation. This study aims to examine, in an interdisciplinary way, the ramifications of the metaphors of the theatre and the cinema, exploring the space of the metropolis. The corpus for the study consists of the novel City of Glass by Paul Auster (1999) and the filmic narrative Synecdoche New York by Charlie Kaufman (2008). To this end, we present theorists of the metaphor, having as the main source Hans Blumenberg, the founder of Metaphorology, Paul Ricoeur and Derrida, especially the studies that focus on this figure of speech. Metaphors, however, take place in a certain space, the metropolis, and to be guided in their ways, we elected the new cultural geography researchers, Paul Claval, Mathias Le Bossé and Denis Cosgrove among them. For the relation between the city and the theatre, we consider the creation story of the western theatre as the main starting point for the ramifications of such mimicry. To study the specific space of the metropolis, we count on Walter Benjamin and his followers. Benjaminian studies will also be of vital importance for our understanding of the relationship between the cinema and the metropolis. That relationship has also been explained in Nietzches questioning of the truth. It was not our intention to compare the works analyzed here in their narratology plans and techniques. Rather, we aimed at relating two texts governed by similar but yet different codes and artistic procedures. We seek to show how theatrical and cinematic relations in the metropolis, fragmented as the man lost in it, cause a suspension of the border between reality and fiction
300

A reprodução do espaço na metrópole: a habitação como negócio urbano / The reproduction of space in the metropolis: housing as an urban business

Vieira, Rosângela Viana 12 December 2014 (has links)
Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-03-27T19:52:07Z No. of bitstreams: 2 Tese - Rosângela Viana Vieira - 2014.pdf: 8960924 bytes, checksum: 4409d22090ddf340322c6267704dd1ce (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-03-27T19:54:13Z (GMT) No. of bitstreams: 2 Tese - Rosângela Viana Vieira - 2014.pdf: 8960924 bytes, checksum: 4409d22090ddf340322c6267704dd1ce (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-03-27T19:54:13Z (GMT). No. of bitstreams: 2 Tese - Rosângela Viana Vieira - 2014.pdf: 8960924 bytes, checksum: 4409d22090ddf340322c6267704dd1ce (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2014-12-12 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / This paper analyses the politics for housing of social interest, resulted from the first public-private partnership for habitation in Brazil, and also its materiality in the city of Brasília, based on Jardins Mangueiral Housing Sector, as well as the housing production of some towns of Brasília metropolitan area, specifically Valparaíso de Goiás and Luziânia. Our goal is to comprehend the space reproduction of the metropolis of Brasília in the public-private relation of the Federal District government habitation politics. This space is also a real estate entrepreneurship which aims at determining the most appropriate place for the individuals according to their social class. This entrepreneurial condition is more expressive whenever the government reproduces the space for the execution of the commodity city. This process takes place in order to see the city as a value, once political economy practices are inserted into the territory to maximize the space conceived as the urban became business. The process also defines the space-time that composes the metropolis, having social housing integrated into this moment in order to reproduce it, and not only aggregate capital, and therefore, changing the city into a business. Once habitation as business embraces the metropolitan area, it shows capital circulation searching for economical form of the property, its added-value and transfers of public assets to private corporations, strengthened by the fact that production focuses on stage 2 of the Social Program My house, My life. To achieve the comprehension of business and productive activity of the urban by the government, having social housing as evaluative nexus and capital retention instrument for space reproduction, we have appealed to material and discursive conditions stipulated for territory planning and also to the execution of habitation politics in the corporative context of the economic activity in the place. The result of this paper is a reflection over the importance of studying space reproduction from relations which are maximized in the inductive economical politics, according to the logics of the metropolis value. The consequences of city negation, urban segregation enlargement and creation of new towns in Brasília metropolitan area are accumulation for dispossession and expropriation of public property. Being the space content of the modern class struggles, it configures the non- circumstantial place of the contradictions which are inherent to capitalism permanent strategies, as well as the political future built from social relations conflicts in the urban. The thesis is about the production/reproduction of the space in the city as an element which separates men from their future, which deviates them from the political community once their condition, created by the space, can be seen either as overcoming barriers or subordination, opposition and conflict. / Este trabalho analisa a política de habitação de interesse social, resultado da primeira parceria público-privada para a habitação no Brasil, e sua materialidade na cidade de Brasília, a partir do Setor Habitacional Jardins Mangueiral, bem como a produção habitacional nas cidades de sua Área Metropolitana, especificamente Valparaíso de Goiás e Luziânia. O objetivo é compreender a reprodução do espaço da metrópole de Brasília na relação público-privada da política habitacional do Governo do Distrito Federal. O espaço reproduzido pelo estado do Distrito Federal, que é ao mesmo tempo um empreendedor imobiliário, é feito para determinar o lugar de cada um segundo sua condição de classe. Essa condição empresarial adquire mais expressão quando o governo passa a reproduzir o espaço para a realização da cidade mercadoria. Esse processo constitui-se para tornar a cidade valor, a partir da inserção de práticas da economia política no território para potencializar o espaço na realização do urbano como negócio. Define, por sua vez, o espaço-tempo da constituição da metrópole, tendo a habitação social integrada a esse momento não para formar capital, e sim para reproduzi-lo, por isso ela se torna um negócio. A habitação como negócio, ao abranger a área metropolitana, evidencia a circulação do capital em busca da forma econômica da propriedade e de mais-valia e da transferência de ativos públicos para empresas privadas, fortalecida no fato de uma produção voltada principalmente à faixa 2 do PMCMV. Para se chegar a esse entendimento da atuação empresarial e produtiva do urbano pelo governo, tendo a habitação social como nexo valorativo e instrumento de captação de capitais para a reprodução do espaço, recorreu-se às condições materiais e discursivas estipuladas para o ordenamento do território e à execução da política habitacional no contexto empresarial da realização econômica do lugar. O resultado deste trabalho é a reflexão sobre a importância do estudo da reprodução do espaço a partir das relações potencializadas na economia política e indutora, segundo a lógica do valor da instituição da metrópole. A consequência da negação da cidade, da ampliação da segregação urbana e da criação de novos municípios na área metropolitana de Brasília é a acumulação por despossessão e expropriação do patrimônio público. Conteúdo da moderna luta de classes, o espaço configura o lugar não circunstancial das contradições inerentes às estratégias permanentes do capitalismo, bem como o devir político construído a partir dos conflitos das relações sociais no urbano. A tese desenvolvida diz respeito à produção/reprodução do espaço na cidade como elemento de separação dos homens e de seu devir, do desvio dos homens da comunidade política como condição produzida no espaço, sendo o uso o eixo de superação ou subordinação, oposição e conflito.

Page generated in 0.0727 seconds