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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.
1

Conex?o entre as redes complexas e estat?stica de Kaniadakis e busca eficiente das propriedades cr?ticas do processo epid?mico difusivo 1D

Macedo Filho, Antonio de 17 February 2011 (has links)
Made available in DSpace on 2014-12-17T15:14:53Z (GMT). No. of bitstreams: 1 AntonioMF_TESE.pdf: 2442431 bytes, checksum: 5b4a291a0463cccea8bc8ffd82ea7840 (MD5) Previous issue date: 2011-02-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In this work we study a connection between a non-Gaussian statistics, the Kaniadakis statistics, and Complex Networks. We show that the degree distribution P(k)of a scale free-network, can be calculated using a maximization of information entropy in the context of non-gaussian statistics. As an example, a numerical analysis based on the preferential attachment growth model is discussed, as well as a numerical behavior of the Kaniadakis and Tsallis degree distribution is compared. We also analyze the diffusive epidemic process (DEP) on a regular lattice one-dimensional. The model is composed of A (healthy) and B (sick) species that independently diffusive on lattice with diffusion rates DA and DB for which the probabilistic dynamical rule A + B &#8594; 2B and B &#8594; A. This model belongs to the category of non-equilibrium systems with an absorbing state and a phase transition between active an inactive states. We investigate the critical behavior of the DEP using an auto-adaptive algorithm to find critical points: the method of automatic searching for critical points (MASCP). We compare our results with the literature and we find that the MASCP successfully finds the critical exponents 1/&#1141; and 1/z&#1141; in all the cases DA =DB, DA <DB and DA >DB. The simulations show that the DEP has the same critical exponents as are expected from field-theoretical arguments. Moreover, we find that, contrary to a renormalization group prediction, the system does not show a discontinuous phase transition in the regime o DA >DB. / Neste trabalho, estudamos a conex?o entre uma estat?stica n?o Gaussiana, a estat?stica de Kaniadakis, e as redes complexas. N?s mostramos que a distribui??o de conectividades P(k), de uma rede livre de escala, pode ser determinada usando a maximiza??o da entropia de informa??o no contexto de estat?sticas n?o Gaussianas. Como exemplo, discutimos uma an?lise num?rica baseada no modelo de crescimento com liga??o preferencial e comparamos o comportamento num?rico da distribui??o de conectividade entre as estat?sticas de Kaniadakis e a de Tsallis. Analisamos, ainda, o processo de propaga??o de epidemia em uma rede regular unidimensional. O sistema que comp?e o modelo ? composto de esp?cies A (sadios) e esp?cies B (doentes) que se difundem, independentemente na rede, com taxas DA e DB e seguem a regra din?mica probabil?stica A+B &#8594; 2B e B &#8594; A. Este modelo, pertence ? categoria de sistemas de n?o equil?brio com um estado absorvente e uma transi??o de fase entre os estados ativo-inativo do sistema. Investigamos o comportamento cr?tico, usando um algoritmo auto-adaptativo para encontrar pontos cr?ticos: o m?todo de busca autom?tica para pontos cr?ticos (MBA). Comparamos nossos resultados com os correspondentes da literatura cient?fica e encontramos que o MBA determina, com sucesso, os expoentes cr?ticos 1/&#1141; e 1/z&#1141; em todos os casos DA = DB, DA < DB e DA > DB. As simula??es mostraram que o processo epid?mico difusivo tem os mesmos expoentes cr?ticos encontrados no contexto da Teoria de Campo. Al?m disso, encontramos que, ao contr?rio das predi??es de Grupo de Renormaliza??o, o sistema n?o mostra uma transi??o de fase descont?nua para o regime DA > DB

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