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Doctoral Thesis
DOI
https://doi.org/10.11606/T.43.2003.tde-20022014-142003
Document
Author
Full name
Paulo de Tarso Dalledone Siqueira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2003
Supervisor
Committee
Pascholati, Paulo Reginaldo (President)
Lima, Vera Maura Fernandes de
Monteiro, Luiz Henrique Alves
Pinto, Reynaldo Daniel
Piqueira, Jose Roberto Castilho
Title in Portuguese
Memória: preservação de características individuais e de grupo em sistemas coerentes formados pelo acoplamento de osciladores
Keywords in Portuguese
Coerência
Malhas de sincronismo de fase
PLL
Sincronismo
Abstract in Portuguese
O presente trabalho propõe-se a oferecer respostas à questão de como a informação é preservada num sistema, focalizando-se na distinção entre os papéis desempenhados pelos constituintes elementares e pelos estruturais na preservação da memória desse sistema. Os sistema simulados circunscreveram-se a malhas, com diferentes graus de regularidade, compostas pelo acoplamento de osciladores não-lineares que apresentam comportamento coerente no estado de equilíbrio. Malhas de Sincronismo de Fase, também conhecidas por PLLs (Phase Locked Loops), foram adotadas como elementos constituintes básicos dos sistemas analisados. Para tanto, utilizou-se a plataforma de cálculo MATLAB-SIMULINK, acompanhando-se as evoluções dos diversos sistemas e de seus parâmetros dinâmicos associados, possibilitando o estabelecimento da correspondência entre os valores dos referidos parâmetros dinâmicos com parâmetros gráficos "sensíveis" à estrutura das malhas. Os resultados obtidos indicam a coexistência/cooperação das componentes estrutural e elementar na determinação dos valores dos parâmetros dinâmicos no estado de equilíbrio do sistema. No entanto, evidencia-se que tais componentes apresentam importâncias distintas na determinação dos diferentes parâmetros dinâmicos.
Title in English
Memory: preservation of individual and group characteristics in coherent systems formed by the coupling of oscillators
Keywords in English
Coherence
PLL Phase locked loops
Small-world
Synchronism
Abstract in English
This work was conceived aiming to present some answers to how the information is preserved in a system. The focus was laid on the distinction between the tasks played by the elementary components and the structure of the system. The simulated systems were composed by coupled oscillators, more precisely by PLLs (Phase Locked Loops), arranged in networks of different regularities. Simulations were performed using Matlab-Simulink software to build a correlation between the final state dynamical parameters of the system and its degree of regularity. Results show the influence of both elementary and structural components on the system attained state. However the responses of characteristics parameters of the system to changes in the regularity of the structured network may greatly differ from one parameter to another. This behavior may suggest different strategies to preserve information of the system according to the information to be kept.
 
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39543Siqueira.pdf (23.13 Mbytes)
Publishing Date
2014-02-20
 
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