Made available in DSpace on 2016-06-02T20:05:59Z (GMT). No. of bitstreams: 1 DissCMLN.pdf: 11627851 bytes, checksum: 40cb68e8fa183a86835c193d08d4a6ac (MD5) Previous issue date: 2007-07-22 / Financiadora de Estudos e Projetos / In this work we considered four types of models for count data: the Poisson model, the Negative Binomial Model and variations of these models for count inflated of zeros (ZIP and ZINB). Information on the number of put eggs for the mosquito aedes in the city of São José of Rio Preto, SP, was analyzed through models for counting data. The number of eggs of the mosquito aedes is studied firstly without the covariable and through some tests, it was verified that models zero inflated (ZIP and ZINB) are more adapted to analyze the data under study. The ZIP model was shown inadequate, due to overdispersion generated by the variability of the data. The ZINB model, was shown more flexible to the data as it is shown graphically. / Neste trabalho são considerados quatro tipos de modelos para dados de contagens: o Modelo Poisson, o Modelo Binomial Negativo e variações destes modelos para contagens inflacionadas de zeros (ZIP e ZINB). Informações do número de ovos postos pelo mosquito Aedes aegypti na cidade de São José do Rio Preto, SP, foram analisadas neste trabalho através de modelos para dados de contagens. O número de ovos do mosquito Aedes aegypti é primeiramente estudado sem o uso de covariáveis e através de alguns testes, foi verificado que modelos inflacionados de zeros (ZIP e ZINB) são mais adequados para analisar os dados em questão. O modelo ZIP mostrou-se inadequado, devido à superdispersão gerada pela variabilidade dos dados. Nesse caso, o modelo ZINB, mostrou-se mais flexível ao conjunto de dados como é mostrado graficamente e em seguida foi modelado para três períodos distintos, considerando a variável resposta número de ovos do mosquisto Aedes aegypti .

Submitted by Maria Cecília Fonçatti null (mcmaria18@hotmail.com) on 2017-04-20T14:07:51Z No. of bitstreams: 1 Dissertação.pdf: 2522744 bytes, checksum: e3cc2a605d4dc28871711221d8fca6fc (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-04-25T17:36:16Z (GMT) No. of bitstreams: 1 foncatti_mc_me_prud.pdf: 2522744 bytes, checksum: e3cc2a605d4dc28871711221d8fca6fc (MD5) / Made available in DSpace on 2017-04-25T17:36:16Z (GMT). No. of bitstreams: 1 foncatti_mc_me_prud.pdf: 2522744 bytes, checksum: e3cc2a605d4dc28871711221d8fca6fc (MD5) Previous issue date: 2017-03-09 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Neste trabalho estudamos as propriedades de algumas classes de polinômios que satisfazem uma relação de recorrência de três termos como, por exemplo, os ortogonais, que já foram muito bem explorados, e os para-ortogonais, cuja nomenclatura tem relação com as deficiências em suas propriedades de ortogonalidade. Foram apresentados resultados sobre o comportamento dos zeros de tais de polinômios, além de alguns exemplos como aplicações. / In this work we studied the properties of some classes of polynomials wich satisfy a three term recurrence relation as, for example, the orthogonals, that has already been well explored, and the para-orthogonals, whose name is related to the deficiences in their properties of ortogonality. Results about the behavior of the zeros of these polynomials was shown, besides some examples as aplications.

Orientador: Eliana Xavier Linhares de Andrade / Banca: José Roberto Nogueira / Banca: Heloísa Helena Marino Silva / Resumo: O principal objetivo deste trabalho é realizar um estudo sobre polinômios algébricos e trigonométricos que possuem somente zeros reais. O Teorema de Hermite nos dá condições necessárias e su cientes para que isto aconteça. São discutidas questões relacionadas à localização dos zeros, onde a Regra de Sinais de Descartes teve grande importância. Além disso, alguns teoremas clássicos sobre zeros de polinômios algébricos e trigonométricos são apresentados. / Abstract: The main purpose of this work is to study algebraic and trigonometric poly- nomials that have only real zeros. The Hermite Theorem gives necessary and su cient conditions for this to be true. Questions concerning the locations of the zeros are discussed, where the Descarte's Rule of Signs is of great impor- tance. Furthermore, some classical theorems concerning zeros of algebraic and trigonometric polynomials are presented. / Mestre

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-07-04T12:00:24Z No. of bitstreams: 1 AlexandreHenriqueQuadrosGramosa_DISSERT.pdf: 8637409 bytes, checksum: 7f934f7acad126da23bfa58d9e13a240 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-07-11T14:21:03Z (GMT) No. of bitstreams: 1 AlexandreHenriqueQuadrosGramosa_DISSERT.pdf: 8637409 bytes, checksum: 7f934f7acad126da23bfa58d9e13a240 (MD5) / Made available in DSpace on 2017-07-11T14:21:03Z (GMT). No. of bitstreams: 1 AlexandreHenriqueQuadrosGramosa_DISSERT.pdf: 8637409 bytes, checksum: 7f934f7acad126da23bfa58d9e13a240 (MD5) Previous issue date: 2017-05-05 / Eventos Extremos geralmente s?o respons?veis por produzirem grandes ganhos ou grandes perdas ? sociedade. J? existe uma distribui??o espec?fica, conhecida como Distribui??o de Valores Extremos Generalizada (GEV), desenvolvida para predizer e prevenir tais acontecimentos. Entretanto, em muitas situa??es com dados extremos, existem a presen?a de zeros excessivos no banco de dados, dificultando a an?lise e a precis?o na estima??o. A Distribui??o Inflada de Zeros (ZID) ? recomendada para fazer a modelagem desses dados que apresentam zeros inflacionados. ? objetivo deste trabalho criar uma nova distribui??o para modelar dados de valores extremos e inflados de zeros. Portanto, foi realizado uma mistura das distribui??es GEV e ZID, e tamb?m feito uma abordagem Bayesiana, na busca de obter um melhor ajuste em aplica??es com dados de m?ximos inflacionados de zeros. Foram escolhidas para an?lises, a precipita??o di?ria de chuvas na cidade de Natal do estado do Rio Grande do Norte e nas cidades de Paulistana, Picos, S?o Jo?o do Piau? e Teresina do estado do Piau?. Foi utilizado tamb?m a distribui??o GEV padr?o para modelar estes mesmos dados coletados, a t?tulo de compara??o, e assim, por meio de medidas e estima??es feitas pelas duas distribui??es, verificar a qualidade do ajuste encontrado pela nova distribui??o de Valores Extremos Inflados de Zeros (IGEV). Logo, verificou-se que o modelo foi bem desenvolvido, conseguindo estimar bem os dados de m?ximos, mesmo uma quantidade excessiva de zeros, sendo que a GEV padr?o n?o conseguiu encontrar a distribui??o de equil?brio quando os dados dados possuem muitos zeros. Al?m disso, quando os dados de valores extremos n?o tem zeros inflacionados, o novo modelo converge para a GEV padr?o, identificando a aus?ncia dos zeros. / Extreme events are usually responsible for producing big gains or big losses to society. There is already a specific distribution, known as Generalized Extreme Values Distribution (GEV), developed to predict and prevent such events. However, in many situations with extreme data, there are the presence of excessive zeros in the database, making analysis difficult and difficult to estimate. Influenced Zero Distribution (ZID) is recommended to model such data that has inflated zeros. It is the objective of this work to create a new distribution to model data of extreme and inflated values of zeros. Therefore, a mixture of the GEV and ZID distributions was made, as well as a Bayesian approach, in order to obtain a better fit in applications with data of inflated maximums of zeros. The daily precipitation of rainfall in the city of Natal in the state of Rio Grande do Norte and in the cities of Paulistana, Picos, S?ao Jo?ao do Piau?? and Teresina in the state of Piau?? were chosen for analysis. It was also used the standard GEV distribution to model the same data collected by way of comparison, and thus, through measurements and estimates made by the two distributions, to verify the quality of the adjustment found by the new distribution of Extremes Inflated Zeros Values (IGEV). Therefore, it was verified that the model was well developed, being able to estimate well the maximum data, even an excessive amount of zeros, and the standard GEV could not find the equilibrium distribution when the data given have many zeros. In addition, when the data of extreme values does not have inflated zeros, the new model converges to the standard GEV, identifying the absence of zeros.

This licentiate consists of two papers treating polynomial sequences defined by linear recurrences. In paper I, we establish necessary and sufficient conditions for the reality of all the zeros in a polynomial sequence {P_i} generated by a three-term recurrence relation P_i(x)+ Q_1(x)P_{i-1}(x) +Q_2(x) P_{i-2}(x)=0 with the standard initial conditions P_{0}(x)=1, P_{-1}(x)=0, where Q_1(x) and Q_2(x) are arbitrary real polynomials. In paper II, we study the root distribution of a sequence of polynomials {P_n(z)} with the rational generating function \sum_{n=0}^{\infty} P_n(z)t^n= \frac{1}{1+ B(z)t^\ell +A(z)t^k} for (k,\ell)=(3,2) and (4,3) where A(z) and B(z) are arbitrary polynomials in z with complex coefficients. We show that the roots of P_n(z) which satisfy A(z)B(z)\neq 0 lie on a real algebraic curve which we describe explicitly.

Indiana University-Purdue University Indianapolis (IUPUI) / We consider the behavior of zeros of random polynomials of the from \begin{equation*} P_{n,m}(z) := \eta_0\varphi_m^{(m)}(z) + \eta_1 \varphi_{m+1}^{(m)}(z) + \cdots + \eta_n \varphi_{n+m}^{(m)}(z) \end{equation*} as \( n\to\infty \), where \( m \) is a non-negative integer (most of the work deal with the case \( m =0 \) ), \( \{\eta_n\}_{n=0}^\infty \) is a sequence of i.i.d. Gaussian random variables, and \( \{\varphi_n(z)\}_{n=0}^\infty \) is a sequence of orthonormal polynomials on the unit circle \( \mathbb T \) for some Borel measure \( \mu \) on \( \mathbb T \) with infinitely many points in its support. Most of the work is done by manipulating the density function for the expected number of zeros of a random polynomial, which we call the intensity function.

No description available.

Yes / This study presents an original asymmetric stepped-impedance resonator filter combined with meander coupled-line structures and enabling the realisation of finite transmission zeros (TZs) and the implementation of multi-band bandpass filters. The meander coupled sections (MCSs) tune the TZs and resonant frequencies: with higher-order spurious frequencies cancelled by the TZs, a single wideband with wide stopband from 1.18 to 1.84 GHz is possible. Furthermore, by positioning the finite TZs between the high-order spurious frequencies and adjusting the coupling strength between resonators, a quint-wideband filter can be realised, with centre frequencies of 1.19, 4.29, 5.43, 6.97, 9.9 GHz and fractional bandwidths of 31.9, 15.4, 15.8, 4.3, 39.2%, respectively. More importantly, two filters with single/quad-wideband performance can be realised by tuning the parameters of the MCS, and therefore they can be designed separately by using only one original structure. The triple-wideband filter is realised with the help of the asymmetric parallel uncoupled microstrip section. These filter structures enjoy the advantage of single/multi-band versatility, structure reusability and simplicity. The good in-band and out-of-band performance, low loss and simple structure of the proposed single/tri/quint-wideband filters make them very promising for applications in future multi-standard wireless communication. / European Union's Horizon 2020 research and innovation programme under Grant agreement H2020-MSCA-ITN-2016 SECRET-722424.

Neste trabalho, introduzimos a função zeta de Riemann \'ZETA\'(s), para s \'PERTENCE\' C \\ e apresentamos muito do que é conhecido como justificativa para a hipótese de Riemann. A importância de \'ZETA\' (s) para a teoria analítica dos números é enfatizada e fornecemos uma prova conhecida do Teorema dos Números Primos. No final, discutimos a importância de \'ZETA\'(s) para alguns modelos físicos de interesse e concluimos descrevendo como a hipótese de Riemann pode ser acessada estudando estes sistemas / In this work, we introduce the Riemann zeta function \'ZETA\'(s), s \'IT BELONGS\' C \\ and present much of what is known to support the Riemann hypothesis. The importance of \'ZETA\'(s) to the Analytic number theory is emphasized and a proof for the Prime Number Theorem is reviewed. In the end, we report on the importance of \'ZETA\'(s) to some relevant physical models and conclude by describing how the Riemann Hypothesis can be accessed by studying these systems

Made available in DSpace on 2016-06-02T20:06:09Z (GMT). No. of bitstreams: 1 5618.pdf: 988258 bytes, checksum: 1ce6234a919d1f5b4a4d4fd7482d543c (MD5) Previous issue date: 2013-11-26 / Financiadora de Estudos e Projetos / The analysis of bivariate data can be found in several areas of knowledge, when the data of interest are obtained in a paired way and present correlation between counts. In this work the Holgate bivariate Poisson, bivariate generalized Poisson and bivariate zero-inflated Poisson models are presented, which are useful to the modeling of bivariate count data correlated. Illustrative applications are presented for these models and the comparison between them is made by using criteria of model selection AIC and BIC, as well as the asymptotic likelihood ratio test. Particularly, we propose a Bayesian approach to the Holgate bivariate Poisson and bivariate zero-inflated Poisson models, based in the Gibbs sampling algorithm with data augmentation. / A análise de dados bivariados pode ser encontrada nas mais diversas áreas do conhecimento, quando os dados de interesse são obtidos de forma pareada e apresentam correlação entre as contagens. Neste trabalho são apresentados os modelos Poisson bivariado de Holgate, Poisson generalizado bivariado e Poisson bivariado inflacionado de zeros, os quais são úteis na modelagem de dados de contagem bivariados correlacionados. Aplicações ilustrativas serão apresentadas para estes modelos e a comparação entre eles será realizada pelos critérios de seleção de modelos AIC e BIC, assim como pelo teste da razão de verossimilhança assintótico. Particularmente, propomos uma abordagem Bayesiana para os modelos Poisson bivariado de Holgate e Poisson Inflacionado de zeros, baseada no algoritmo Gibbs sampling com dados ampliados.