Tsallis Entropy
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Comparison of diversity indices applied to macrophyte incidence-based data
In this work, a recently proposed diversity index based on Patil and Taillie parametric diversity measure (or Tsallis entropy), Sq*, was applied to samples (presence-absence data) of macrophytes from the Itaipu Reservoir, Brazil. This new index was the value of the family of indices Sq for a specific evenness of a sample. Results demonstrated that the Shanno
Brazilian Archives of Biology and Technology. Publicado em: 2012-04
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2. Redes complexas de expressão gênica: síntese, identificação, análise e aplicações / Gene expression complex networks: synthesis, identification, analysis and applications
Os avanços na pesquisa em biologia molecular e bioquímica permitiram o desenvolvimento de técnicas capazes de extrair informações moleculares de milhares de genes simultaneamente, como DNA Microarrays, SAGE e, mais recentemente RNA-Seq, gerando um volume massivo de dados biológicos. O mapeamento dos níveis de transcrição dos genes em larga escala é
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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3. Brain tissue segmentation using q-entropy in multiple sclerosis magnetic resonance images
The loss of brain volume has been used as a marker of tissue destruction and can be used as an index of the progression of neurodegenerative diseases, such as multiple sclerosis. In the present study, we tested a new method for tissue segmentation based on pixel intensity threshold using generalized Tsallis entropy to determine a statistical segmentation par
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-01
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4. Ferramentas computacionais na análise da variabilidade da frequência cardíaca através do paradigma não extensivo no estudo de cardiopatias / Computational tools for heart rate variability analysis through non-extensive paradigm in heart diseases.
Este trabalho teve por objetivo construir e avaliar ferramentas de quantificação e análise da variabilidade da freqüência cardíaca segundo o paradigma não extensivo de Tsallis na modelagem do sistema de regulação da freqüência cardíaca, e na discriminação de situação de normalidade e cardiopatias e apoio ao diagnóstico de cardiopatias. O sis
Publicado em: 2010
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5. Symbolic sequences and Tsallis entropy
We address this work to investigate symbolic sequences with long-range correlations by using computational simulation. We analyze sequences with two, three and four symbols that could be repeated l times, with the probability distribution p(l) ∝ 1/l µ. For these sequences, we verified that the usual entropy increases more slowly when the symbols are corre
Brazilian Journal of Physics. Publicado em: 2009-08
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6. Generalized entropy indices to measure α- and β-diversities of macrophytes
A family of entropy indices constructed in the framework of Tsallis entropy formalism is used to investigate ecological diversity. It represents a new perspective in ecology because a simple equation can incorporate all aspects of α-diversity, from richness to dominance and can be also related to a measure of species rarity. In addition, a generalized Kullb
Brazilian Journal of Physics. Publicado em: 2009-08
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7. Introducing the q-Theil index
Starting from the idea of Tsallis on non-extensive statistical mechanics and the q-entropy notion, we recall the Theil index Th and transform it into the Th q index. Both indices can be used to map onto themselves any time series in a non linear way. We develop an application of the Th q to the GDP evolution of 20 rich countries in the time interval [1950 -2
Brazilian Journal of Physics. Publicado em: 2009-08
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8. Nonadditive entropy and nonextensive statistical mechanics -an overview after 20 years
Statistical mechanics constitutes one of the pillars of contemporary physics. Recognized as such - together with mechanics (classical, quantum, relativistic), electromagnetism and thermodynamics -, it is one of the mandatory theories studied at virtually all the intermediate-and advanced-level courses of physics around the world. As it normally happens with
Brazilian Journal of Physics. Publicado em: 2009-08
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9. Cerebral tissue segmentation using q-entropy in multiple sclerosis magnetic resonance images / Segmentação de tecidos cerebrais usando entropia Q em imagens de ressonância magnética de pacientes com esclerose múltipla
A perda volumétrica cerebral ou atrofia é um importante índice de destruição tecidual e pode ser usada para apoio ao diagnóstico e para quantificar a progressão de diversas doenças com componente degenerativo, como a esclerose múltipla (EM), por exemplo. Nesta doença ocorre perda tecidual regional, com reflexo no volume cerebral total. Assim, a pre
Publicado em: 2008
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10. Propriedades termo-eletrônicas da molécula do DNA
This thesis presents a comprehensive and up-to-date account of some physical properties of the DNA molecule, such as its thermodynamics (specific heat) and electronic (electronic transmissivity and localization factor, among others) aspects. The DNA molecule can be considered as a symbolic sequence of a four letter alphabet, namely guanine (G), adenine (A),
Publicado em: 2008
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11. A unified regularization theory: the maximum non-extensive entropy principle
Tsallis' non-extensive entropy is used as a regularization operator. The parameter ''q'' (non-extensivity parameter) has a central role in the Tsallis' thermostatiscs formalism. Here, several values of q are investigated in inverse problems, using q < 1 and q > 1. Two standard regularization techniques are recovered for special q-values: (i) q = 2 is the wel
Computational & Applied Mathematics. Publicado em: 2006
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12. THERMODYNAMIC NONEXTENSIVITY, DISCRETE SCALE INVARIANCE AND ELASTOPLASTICITY: A STUDY OF A SELF-ORGANIZED CRITICAL GEOMECHANICAL NUMERICAL MODEL / NÃO-EXTENSIVIDADE TERMODINÂMICA, INVARIÂNCIA DISCRETA DE ESCALA E ELASTO-PLASTICIDADE: ESTUDO NUMÉRICO DE UM MODELO GEOMECÂNICO AUTO-ORGANIZADO CRITICAMENTE
This thesis aims at applying new concepts from solid state physics and statistical mechanics - chaos theory and fractal geometry - to the study of nonlinear dynamic systems. More precisely, it deals with a two-dimensional continuum elastoplastic Mohr-Coulomb model, commonly used to simulate pressure-sensitive materials (e.g., soils, rocks and concrete) subje
Publicado em: 2003