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  • 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.
141

Den andres bröd : Levnadsrisk utifrån Lee-Cartermodellen

Mellkvist, Lars January 2008 (has links)
<p>Under det gångna århundradet ökade den förväntade livslängden avsevärt såväl i Sverige som i övriga världen. 1900-talets förbättrade livslängd drevs inledningsvis av en minskad barnadödlighet medan de senare årtiondena kännetecknades av minskad dödlighet i höga åldrar.</p><p>En åldrande befolkning innebär ökade krav på sjukvård, äldreomsorg och inte minst pensionssystem. Pålitliga prognoser för vår framtida livslängd behövs för att beräkna de resurser som nämnda verksamheter kommer att ta i anspråk och utgör förutsättningen för en rättvis prissättning av försäkringsprodukter med levnadsrisk.</p><p>Lee-Carter-modellen är en av vår tids tongivande modeller för mortalitetsprognostisering. Modellen används här för att göra livslängdsprognoser utifrån svenska mortalitetsdata; prognoserna jämförs sedan med observerade utfall.</p><p>Mot bakgrund av resultatet diskuteras levnadsrisk med fokus på pensioner.</p><p>Inte oväntat presterar prognoserna ingen felfri bild av verkligheten och prognosfelet varierar i storlek mellan skattningarna; att använda dem som underlag för pensionsberäkningar hade i förlängningen varit ohållbart. Exemplet illustrerar på samma gång vår osäkerhet inför framtidens livslängdsutveckling och svårigheten i att prognostisera den.</p> / <p>During the past century, Sweden along with many other countries experienced a sharp decline in mortality rates. The increased life expectancy was initially propelled by mortality reductions among infants and subsequently by a survival improvement in advanced ages.</p><p>An ageing population has large implications for those providing services to the elderly, such as medical care and pensions, whilst also addressing the need for accurate and reliable mortality forecasts and projection methods.</p><p>The Lee-Carter model is the current gold standard for mortality forecasting and has been widely adopted in several studies. Here, the model is applied on Swedish mortality data; the projections are then compared to the observed lifespan development. Against this backdrop, a discussion on longevity risk in pensions schemes follows.</p><p>The forecasts performed in this study do not perfectly reflect the observed mortality change in the examined period; furthermore, the variation of the estimation errors limits the actuarial value of the projections. The findings illuminate the uncertainty that surrounds our future life expectancy as well as the difficulties associated with forecasting it.</p>
142

Metody projekce úmrtnosti a riziko dlouhověkosti / Methods for mortality forecasting and longevity risk

Počerová, Veronika January 2013 (has links)
The main aim of this thesis is to analyse different mortality models regarding the longevity risk. We focus on the well-known stochastic models (Lee-Carter model, Age-period-cohort model by Renshaw and Haberman, Cairns-Blake-Dowd two-factor model) and compare them with relatively new Taiwanese model by Yang, Yue and Huang which is based on principal component analysis. Both the theoretical and also the empirical parts are included. Empirical part evaluates all the models mentioned above on the Czech mortality data from 1970-2000 for individuals aged between 50-100 years. Final mortality predictions are made for next 30 years.
143

Teorema Central do Limite para o modelo O(N) de Heisenberg hierárquico na criticalidade e o papel do limite N -> infinito na dinâmica dos zeros de Lee-Yang / Central Limit Theorem for the hierarchical O(N) Heisenberg model at criticality and the role of the N -> infinity limit for the Lee-Yang zeros´s dynamics

Conti, William Remo Pedroso 11 June 2008 (has links)
Neste trabalho estabelecemos o Teorema Central do Limite para o modelo O(N) de Heisenberg hierárquico na criticalidade via equação a derivadas parciais no limite N -> infinito. Por simplicidade consideramos apenas o caso d = 4, sendo o teorema também válido para d > 4. Pelo estudo de uma dada equação a derivadas parciais (EDP) determinamos a temperatura inversa crítica do modelo esférico hierárquico contínuo para um d > 2 qualquer, havendo conexão entre criticalidade e o ponto fixo da EDP. Por meio de uma análise geométrica da trajetória crítica obtemos informações sobre a dinâmica e distribuição dos zeros de Lee-Yang. / In this work we stablish the Central Limit Theorem for the hierarchical O(N) Heisenberg model at criticality via partial differential equation in the limit N -> infinity. For simplicity we only treat the d = 4 case but the theorem is still valid for d > 4. By studying a given partial differential equation (PDE) we determine for any d > 2 the critical inverse temperature of the continuum hierarchical spherical model, and we show a connection between criticality and the fixed point of PDE. By means of a geometric analysis of the critical trajectory we obtain some informations about Lee-Yang zeros´s dynamics and distribution.
144

Destinos e trajetos: Edward Lee Thorndike e John Dewey na formação matemática do professor primário no Brasil (1920-1960) / Destinations and trajectoriess: Edward Lee Thorndike and John Dewey in primary mathematics teacher education in Brazil (1920-1960)

Rabelo, Rafaela Silva 19 May 2016 (has links)
A presente tese tem como tema as contribuições de Edward Lee Thorndike e de John Dewey no campo da educação matemática. Especificamente, a pesquisa teve como objetivo investigar os processos de circulação das ideias desses educadores na formação matemática de professores do ensino primário no Brasil e as apropriações decorrentes desses processos, centrando a discussão entre as décadas de 1920 e 1960. Os conceitos de circulação, apropriação e histórica conectada, dentre outros, foram operados com base em autores tais como Roger Chartier, Serge Gruzinski, Pierre Bourdieu e Michel de Certeau. Constituíram-se enquanto fontes de pesquisa programas de ensino, manuais pedagógicos, relatórios de viagem, correspondência, jornais e revistas pedagógicas. A análise desenvolveu-se privilegiando os viajantes pedagógicos e os impressos. Quanto a este último, o foco recaiu nos programas de ensino, bibliotecas pedagógicas e manuais pedagógicos. Dentre as conclusões, observa-se o papel importante que os viajantes pedagógicos desempenharam na circulação das ideias de Dewey e de Thorndike, seja na forma de publicações que faziam referência aos educadores estadunidenses, ou por meio da atuação docente na formação de professores. Outros meios de promover essa circulação foram os programas de ensino e bibliotecas pedagógicas, nos quais constam títulos de Dewey e Thorndike e manuais que a eles fazem referência. Em termos de apropriação, percebe-se a presença de Dewey para tratar de assuntos de escopo mais geral da educação, enquanto que Thorndike é mobilizado para discutir questões mais específicas de aritmética, tais como a importância de recorrer a situações e valores reais. / The following thesis focus on the contributions of Edward Lee Thorndike and John Dewey to mathematics education field. Specifically, the research had as aim to investigate the processes of circulation of these authors ideas in mathematics teachers education in Brazil and the correspondent appropriations, focusing the discussion in the period between 1920s and 1960s. The concepts of circulation, appropriation and connected history, and others, were operated based in such authors as Roger Chartier, Serge Gruzinski, Pierre Bourdieu and Michel de Certeau. Some of the sources were course programs, handbooks, travel reports, correspondence, papers and pedagogical journals. The analysis privileged the pedagogical travelers and the impressions. In relation to the impressions, the focus was the course programs, pedagogical libraries and handbooks. The conclusions point to the important part played by the pedagogical travelers in the circulation of Deweys and Thorndikes ideas, through publications referring to these American educators or based on practice in teachers education. Other ways that promoted the circulation were the course programs and the pedagogical libraries, where there are Deweys and Thorndikes works included or handbooks that mention them. Related to appropriation, Dewey is mentioned referring to general aspects of education, and Thorndike to more specific discussions related to arithmetic.
145

Um mecanismo: invasão de células epiteliais por amostras de Escherichia coli enterohemorrágica (EHEC) LEE-negativas. / A mechanism: invasion of epithelial cells by LEE-negative enterohaemorrhagic Escherichia coli (EHEC) strains.

Rennó, Verônica De Franco 11 June 2008 (has links)
Escherichia coli enterohemorrágicas (EHEC) que possuem a Ilha de Patogenicidade LEE são importantes patógenos humanos. A habilidade de adesão, invasão e perfil genético têm sido estudados, já que sorotipos que não possuem LEE tem sido isolados de pacientes com doença severa e intracelularmente. Das nove amostras relacionadas com doença, quatro (44.5%) apresentaram stx2+. Todas foram positivas para o gene lpfA e iha, e negativas para toxB. Três (33,3%) apresentaram saa e cinco hly. A maioria apresentou padrão de adesão difusa e invasão negativa em células HEp-2. Em CaCO-2 apresentaram aderência com variados graus de intensidade, e a maioria das amostras testadas apresentou invasão maior que 3,3%. Frente ao inibidor de polimerização de actina citocalasina D, houve significativa redução nos níveis de invasão, sugerindo que estas amostras utilizam um mecanismo da célula hospedeira para internalização, e que provavelmente, fatores de virulência como adesinas, favorecem a adesão das mesmas, compensando a ausência do LEE, e facilitando a instalação da infecção. / Enterohaemorrhagic Escherichia coli (EHEC) that possess the pathogenic island LEE are important human pathogens. The adhesion ability, invasion and genetic profile have been studied, since serotypes that do not possess LEE have been isolated from humans with severe disease and found intracellular. Nine strains related with SHU, four (44,5%) were stx2+. All strains were positive for IpfA and iha genes and negative for toxB. Three (33,3%) showed saa and five hly. The most strains showed a diffusely adhesion pattern and negative invasion in HEp-2 cells. It presented various degrees of adhesion, and the most tested strains showed invasion high than 3,3% in CaCO-2. That was a significant reduction of invasion in the presence of actin polymerization inhibitor Citochalasin D, suggesting that these strains use a host cell mechanism to invade, and probably virulence factors, like adhesins, favors this adhesion and compensate LEE absence, promoting the installation of infection.
146

A presença das Grandmothers nas temporalidades das narrativas autobiográficas de Beverly Hungry Wolf, Lee Maracle e Maria Campbell / The presence of grandmothersin the temporalities of autobiographical narratives of Beverly Hungry Wolf, Lee Maracle and Maria Campbell

Alvany Rodrigues Noronha Guanaes 03 October 2011 (has links)
O objetivo desta tese é estudar as autobiografias de três escritoras aborígenes canadenses: Beverly Hungry Wolf, Lee Maracle e Maria Cambpell, à luz de teorias sobre temporalidades das narrativas. Entende-se aqui a narrativa como um espaço temporal no qual as escritoras incorporam e presentificam a figura das avós (grandmothers), o que torna a literatura produzida por elas uma ponte entre o individual e o coletivo, o estético e o social, o pessoal e político. Essas autobiografias apresentam três temporalidades: o presente do passado, em que a memória é o elemento principal na constituição da identidade; o presente do presente, em que a visão da experiência do sujeito motiva uma ação; e o presente do futuro, que aponta para uma expectativa no discernimento das responsabilidades frente à comunidade e ao poder político estabelecido. Para tal, lançaremos mão das teorias de Ricoeur sobre temporalidades em diálogo com a teórica indígena Kim Anderson e outros teóricos que conformam a fortuna crítica das autoras e da literatura indígena canadense e norte-americana. / The aim of this thesis is to study the autobiographical novels written by three Canadian aboriginal female writers: Beverly Hungry Wolf, Lee Maracle and Maria Campbell under the light of theories about temporalities on narratives. We take narratives as temporal spaces on which the writers incorporate and presentify the figure of their grandmothers, a device through which their literature becomes a bridge between the individual and the collective, the aesthetical and the social, and the personal and the political. These autobiographies present three temporalities: the present of the past, on which memory is the main element in the identity constitution; the present of the present, on which the vision of experience motivates action; and the present of the future, which points to an expectation on discernment of responsibilities towards the subjects community and the established political power. The theoretical background is based on Ricoeurs theories on temporalities in dialogue with Indigenous theoretician Kim Anderson and others who build up the critical reception of these authors and of Native Canadian and Native American literatures.
147

A presença das Grandmothers nas temporalidades das narrativas autobiográficas de Beverly Hungry Wolf, Lee Maracle e Maria Campbell / The presence of grandmothersin the temporalities of autobiographical narratives of Beverly Hungry Wolf, Lee Maracle and Maria Campbell

Guanaes, Alvany Rodrigues Noronha 03 October 2011 (has links)
O objetivo desta tese é estudar as autobiografias de três escritoras aborígenes canadenses: Beverly Hungry Wolf, Lee Maracle e Maria Cambpell, à luz de teorias sobre temporalidades das narrativas. Entende-se aqui a narrativa como um espaço temporal no qual as escritoras incorporam e presentificam a figura das avós (grandmothers), o que torna a literatura produzida por elas uma ponte entre o individual e o coletivo, o estético e o social, o pessoal e político. Essas autobiografias apresentam três temporalidades: o presente do passado, em que a memória é o elemento principal na constituição da identidade; o presente do presente, em que a visão da experiência do sujeito motiva uma ação; e o presente do futuro, que aponta para uma expectativa no discernimento das responsabilidades frente à comunidade e ao poder político estabelecido. Para tal, lançaremos mão das teorias de Ricoeur sobre temporalidades em diálogo com a teórica indígena Kim Anderson e outros teóricos que conformam a fortuna crítica das autoras e da literatura indígena canadense e norte-americana. / The aim of this thesis is to study the autobiographical novels written by three Canadian aboriginal female writers: Beverly Hungry Wolf, Lee Maracle and Maria Campbell under the light of theories about temporalities on narratives. We take narratives as temporal spaces on which the writers incorporate and presentify the figure of their grandmothers, a device through which their literature becomes a bridge between the individual and the collective, the aesthetical and the social, and the personal and the political. These autobiographies present three temporalities: the present of the past, on which memory is the main element in the identity constitution; the present of the present, on which the vision of experience motivates action; and the present of the future, which points to an expectation on discernment of responsibilities towards the subjects community and the established political power. The theoretical background is based on Ricoeurs theories on temporalities in dialogue with Indigenous theoretician Kim Anderson and others who build up the critical reception of these authors and of Native Canadian and Native American literatures.
148

Modèles log-bilinéaires en sciences actuarielles, avec applications en mortalité prospective et triangles IBNR

Delwarde, Antoine 29 March 2006 (has links)
La présente thèse vise à explorer différents types de modèles log-bilinéaires dans le domaine des sciences actuarielles. Le point de départ consiste en le modèle de Lee-Carter, utilisé pour les problèmes de projection de la mortalité. Différentes variantes sont développées, et notamment le modèle de Poisson log-bilinéaire. L'introduction de variables explicatives est également analysée. Enfin, une tentative de d'exportation de ces modèles au cas des triangles IBNR est effectuée.
149

Modèles log-bilinéaires en sciences actuarielles, avec applications en mortalité prospective et triangles IBNR

Delwarde, Antoine 29 March 2006 (has links)
La présente thèse vise à explorer différents types de modèles log-bilinéaires dans le domaine des sciences actuarielles. Le point de départ consiste en le modèle de Lee-Carter, utilisé pour les problèmes de projection de la mortalité. Différentes variantes sont développées, et notamment le modèle de Poisson log-bilinéaire. L'introduction de variables explicatives est également analysée. Enfin, une tentative de d'exportation de ces modèles au cas des triangles IBNR est effectuée.
150

A Confident or an Alien: The Hong Kong/Formosa Intellectual Wan-chu Lee¡¦s and His Son Peter Nan-shong Lee¡¦s Views of China

Li, Jia-hui 16 February 2011 (has links)
Societies in Hong Kong and Taiwan (Formosa) are not familiar with each as they are separate colonies taken by Britain and Japan respectively. This study explores a rare string linking the two communities through Wan-chu Lee and his son Nan-shong. Their evolving views on China reflect larger historical and social background on one hand and yet demonstrate agencies in choosing and forming individual choices regarding both political identities and postcolonial possibilities on other hand. In particular, their multiple views on China are full of individual judgments mediating among China, Taiwan, and Hong Kong as well as between global and regional forces.

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