Self Organized Criticality
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Self-organization of population in Artificial Immune Systems applied to the protein docking / Auto-organização da população em sistemas imunológicos artificiais aplicada ao docking de proteínas
Vários problemas do mundo real podem ser analisados como problemas de otimização. Na bioinformática, em especial, como exemplos podem ser citados o alinhamento múltiplo de sequências, a filogenia, a predição de estruturas de proteínas e RNA, entre outros. As Meta-heurísticas Populacionais (MhP) são técnicas baseadas em interações de conjuntos d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/07/2012
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2. Multifractalidade e criticalidade auto-organizada da precipitação pluvial em Piracicaba-SP, Brasil.
A precipitação pode ser entendida como um produto final de processos atmosféricos complexos, os quais variam no tempo e espaço, e pode ser considerada um dos mais importantes fatores domininante das características meteorológicas-climáticas de uma determinada área investigada. Neste trabalho, verificamos se a dinâmica da chuva em Piracicaba, São Pa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2011
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3. Dinâmica adaptativa em populações de predadores e presas / Adaptive dynamics in predator and prey populations
Neste trabalho estudamos a dinâmica espaço-temporal de cadeias alimentares compostas por duas e três espécies. Utilizamos uma modelagem baseada nos indivíduos, que consiste em tratar cada membro da população de forma explícita. Um dos ingredientes do modelo é a possibilidade de restringir a área de forrageio dos predadores à uma região circular,
Publicado em: 2010
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4. Avalanches neuronais durante o ciclo sono-vigÃlia de ratos
Neuronal avalanches are spatiotemporal patterns of neuronal activity that occur spontaneously in supercial layers of the mammalian cortex under various experimental conditions. Previous studies in brain slices and cultured cells have shown that the distribution of sizes P(s) of neuronal avalanches obeys a power law relationship: P(s) Â sÂa , with exponent
Publicado em: 2009
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5. Complex network and self-organized criticality: models and applications / Rede complexa e criticalidade auto-organizada: modelos e aplicações
Models and scientific theories arise from the necessity of the human being to better understand how the world works. Driven by this purpose new models and techniques have been created. For instance, one of these theories recently developed is the Self-Organized Criticality, which is shortly introduced in the Chapter 2 of this thesis. In the framework of the
Publicado em: 2007
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6. Estudo de Fractalidade e Evolução Dinâmica de Sistemas Complexos
In this work, the study of some complex systems is done with use of two distinct procedures. In the first part, we have studied the usage of Wavelet transform on analysis and characterization of (multi)fractal time series. We have test the reliability of Wavelet Transform Modulus Maxima method (WTMM) in respect to the multifractal formalism, trough the calcu
Publicado em: 2007
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7. Continuous time stochastic models for vehicular traffic on highways
We have simulated a continuous time version of the Nagel-Schreckenberger model of vehicular traffic on highways and calculated the flux as a function of vehicle density. In the low density regime the flux increases linearly with density but becomes a power law when velocities are allowed to increase without bounds. We have simulated also a modified version i
Brazilian Journal of Physics. Publicado em: 2004-06
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8. Exact solution for the self-organized critical rainfall model
This work presents an analytical investigation for a Self-Organized Criticality abelian model that describes basic properties of rainfall phenomena. The knowledge of the exact solution for the probability that a site topples when mass is added to any other site of the lattice leads to a large number properties of the model, including the exponent of the powe
Brazilian Journal of Physics. Publicado em: 2003-09
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9. The branching rate of the random Olami-Feder-Christensen model with a generic coordination number
In this paper we review and discuss some fundamental aspects of the random version of the Olami-Feder- Christensen model, and its relevance for the understanding of self-organized criticality (SOC). We review the universal character of the exponent or
Brazilian Journal of Physics. Publicado em: 2003-09
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10. 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
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11. Controversial features of granular superconductors studied through the magnetic properties of 2d-Josephson junction arrays
We have shown that the Paramagnetic Meissner Effect (PME) is directly associated with pinning, and not necessarily related to the presence of pi-junctions. Through the study of the magnetic properties of two-dimensional Josephson junction arrays (2D-JJA) in the present work we show that, among the systems exhibiting PME, only those with suffciently low dissi
Brazilian Journal of Physics. Publicado em: 2002-09
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12. Otimização extrema generalizada: um novo algoritmo estocástico para o projeto ótimo / x
In this work a new numerical tool for application on optimal design is presented. Based on the theory of Self-Organized Criticality (SOC), it is intended to be used in problems that present complex characteristics such as a non-convex or even disjoint design space, the presence of multiple sub-optimal solutions on it, severe non-linearities on the objective
Publicado em: 2002