Fractals
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. Estudo comparativo de técnicas de cascateamento de superfícies seletivas em frequência
Este trabalho apresenta uma análise teórica e numérica do cascateamento de superfícies seletivas de frequência, que usa patches retangulares e fractais de Koch triangular como elementos. Para isto, são utilizadas duas técnicas de cascateamento, visando à determinação das características de transmissão e de reflexão. Superfícies seletivas de fre
Publicado em: 2009
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14. Análise não-linear no reconhecimento de padrões sonoros : estudo de caso para sons pulmonares / Nonlinear analysis in sound pattern recognition: case study of lung sounds
Nas últimas décadas uma considerável parcela das pesquisas nas áreas de Física e Matemática tem sido dedicada ao estudo de fenômenos não lineares. Uma possível explicação para isso foi o rápido desenvolvimento de sistemas computacionais, tanto em nível de hardware quanta em nível de software, algoritmos e técnicas de programação que propicia
Publicado em: 2009
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15. Contribuição para a análise de teletráfego com dependência de longa duração. / Contribution to the analysis of network traffic with long-range dependence.
The use of network trac models that hold self-similar and long-range dependence characteristics have shown to be a key element on the correct characterization of Local Area Network (LAN) and Wide Area Network (WAN) network trac [1, 2]. Such characterization is necessary to monitor and control the network trac in converged networks [3]. In this context, the a
Publicado em: 2009
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16. O jogo de futebol : investigação de sua estrutura, de seus modelos e da inteligencia de jogo, do ponto de vista da complexidade / The soccer game ; : searche of this structure, its models and intelligence of the game from the point of view of complexity
In high-level sports, small things make difference between the first and second positions. The game, and in this is case the soccer game, is a complex phenomenon where the player s performance is transdimensional. At every time players and teams meet problem-situations, in unpredictable circumstances that need fast technical, tactical, physical and psycholog
Publicado em: 2009
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17. Geometry, dynamics and fractals
Consider a collection of elastic wires folded according to a given pattern induced by a sequence of fractal plane curves. The folded wires can act as elastic springs. Therefore it is easy to build up a corresponding sequence of simple oscillators composed by the elastic springs clamped at one end and carrying a mass at the opposite end. The oscillation perio
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-03
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18. Análise fractal da vasculatura arteriolar e venular da retina em pessoas sem doença ocular
Although it has been suggested that retinal vasculature is a diffusion-limited aggregation (DLA) fractal, no study has been dedicated to standardizing its fractal analysis. The aims of this project was to standardize a method to estimate the fractal dimensions of retinal vasculature and to characterize their normal values; to determine if this estimation is
Publicado em: 2008
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19. Segmentação de voz baseada na análise fractal e na transformada wavelet. / Speech segmentation based on fractal analysis and wavelet transform.
Nowadays, fractal analysis has been successfully applied to digital speech processing, particularly for words and phonemes segmentation, which represents one of the fundamental steps in automatic speech recognition and speaker identification systems. The practical use of fractal analysis for these purposes should match two principles: low computational cost,
Publicado em: 2008
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20. A dinâmica caleidoscópica do processo de aprendizagem coloborativa no contexto virtual:: um estudo na perspectiva da complexidade/caos
In recent years there has been significant amoung of research guided by completxity and chaos theories in the area of Applied linguistics (Larsen-Freeman, 1997; Paiva, 2005; van Lier, 2004, Lantolf, 2006, Cameron and Deignan, 2006, among others). The ideas of complexity/chaos consider the inter-relation of agents in a complex system is dynamic, non-linear, o
Publicado em: 2008
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21. Perspesctivas da complexidade aplicadas à gestão de empresas. / Perspectives of complexity applied to management.
The present work explores how two general approaches of complexity - complexity sciences and complex thought - are influencing and may come to influence productive organizational systems management. An increase in publications relating Complexity to Management can be observed. By analyzing the content of international and Brazilian academic works, a decrease
Publicado em: 2008
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22. Dois problemas em análise de formas de estruturas de ramificação / Two Problems in Shape Analysis of Branching Structures
O presente texto descreve métodos e apresenta resultados do projeto de pesquisa de mestrado intitulado "Dois Problemas em Análise de Formas de Estruturas de Ramificação". Ambos os problemas abordados estão relacionados às sub-áreas da Análise de Formas denominadas Caracterização e Descrição de Formas. O primeiro problema consiste na investigaçã
Publicado em: 2008
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23. Uma seqüência de ensino para o estudo de progressões geométricas via fractais
The objective of this research is to investigate the learning of Geometric Progressions by fractals and their influences on the construction of the knowledge of this subject. Starting from this objective our research questions emerge: How the use of the fractals motivate can be in the perception of the solemnity-similarity? How can the solemnity-similarity c
Publicado em: 2007
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24. O uso de ferramentas fractais e redes complexas no estudo da variabilidade pluviomÂetrica do Nordeste do Brasil
Brazil Northeastâs climate is usually described as semi-arid, characterized by hard dry seasons intermingled by hard rainfall seasons. Some areas of Northeast present annual pluviometric measure about 400 mm in mean, while in others the annual pluviometric measure is about 2000 mm. Rain events result from interplay of several physical phenomena, most of whi
Publicado em: 2007