Observability
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. Análise da performance do algoritmo d / Performance analysis of D-algorithm
A geração de testes para circuitos combinacionais com fan-outs recovergentes é um problema NP-completo. Com o rápido crescimento da complexidade dos circuitos fabricados, a geração de testes passou a ser um sério problema para a indústria de circuitos integrados. Muitos algoritmos de ATPG (Automatic Test Pattern Generation) baseados no algoritmo D, u
Publicado em: 2010
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14. Estabilidade e controle com criterio de custo medio a longo prazo em sistemas lineares estocasticos / Stability and control of linear stochastic systems with long-run average cost criterion
This monograph presents results on stability and control of stochastic systems represented by linear operators with respect to the state which are non-linear with respect to the control. The control seeks to optimize a long run average cost (LRAC). The control structure does not depend on the past history of the process and it can be used, in particular, to
Publicado em: 2009
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15. Tunning of the Filter of Kalman for indirect measurement of the variable of state in the electrolytic bath / Sintonia do filtro de Kalman para medição indireta das variáveis de estado no banho eletrolitico
A tunning model for Kalman filter based on QR duality principle is presented to measure the state variables of the electrolytic bath in aluminium production cells. The main goal is to establish a set of filter gains that better represents the percentual of alumina in the bath. The filter bandwidth tunning is performed by increasing or decreasing the filter b
Publicado em: 2008
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16. Disappearance of squeezed back-to-back correlations: a new signal of hadron freeze-out from a supercooled quark gluon plasma
We briefly discuss four different possible types of transitions from quark to hadronic matter and their characteristic signatures in terms of correlations. We also highlight the effects arising from mass modification of hadrons in hot and dense hadronic matter, as well as their quantum statistical consequences: the appearance of squeezed quantum states and t
Brazilian Journal of Physics. Publicado em: 2007-09
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17. Measurements quality and redundancy evaluation for power system state estimation / Avaliação da qualidade e redundância das medidas para estimação de estado em sistemas elétricos de potência
The operating center requires much information in order to control and supervise the power systems. In a secure power systems operation it is important that the state estimation process be reliable. For that purpose, in this work: i) a computer program to evaluate and increment the reliability of power system in terms of redundancy and measurements availabil
Publicado em: 2007
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18. Three-phase generalized state estimation / Estimação de estado generalizada trifasica
Since its introduction in 1969 by Fred C. Schweppe, J. Wildes and D. Rom, the power system state estimation has been widely studied. The state estimation is evolving to a more detailed modeling, which considers state variables not commonly used in bus/branch system modeling. A generalized state estimation model, in which switches and circuit breakers are rep
Publicado em: 2007
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19. Methodology for monitoring voltage SAGs and SWELLs in power systems. / Metodologia para a monitoração eficiente de variações de tensão de curta duração em sistemas elétricos de potência.
This dissertation presents a methodology based on Genetic Algorithms and Fuzzy Mathematical Programming to determine the optimum number of power quality monitors and the locations they should be installed to measure Voltage Sags and Swells in transmission power networks. The methodology developed represents a tool for planning power networks, because it indi
Publicado em: 2007
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20. Modelagem de arquiteturas reconfiguráveis com espaços de Chu
As Arquiteturas Reconfiguráveis surgiram no ambiente acadêmico como uma alternativa aos ASICs e aos GGP, mantendo um equilíbrio entre flexibilidade e performance. Este trabalho apresenta uma proposta para a modelagem de Arquiteturas Reconfiguráveis com Espaços de Chu, descrevendo os principais assuntos relativos a esta temática. A sol
Publicado em: 2007
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21. Planning under uncertainty for extended reachability goals / Planejamento sob incerteza para metas de alcançabilidade estendidas
Planning under uncertainty has being increasingly demanded for practical applications in several areas that require reliable solutions for complex goals. In sight of this, in the last few years, some approaches based on formal methods for automatic synthesis of plans have been proposed in the area of Planning in Artificial Intelligence. Among these approache
Publicado em: 2007
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22. A sharp observability inequality for Kirchhoffplate systems with potentials
In this paper, we derive a sharp observability inequality for Kirchhoff plate equations with lower order terms. More precisely, for any T > 0 and suitable boundary observation domains (satisfying the geometric conditions that the multiplier method imposes), we prove an estimate with an explicit observability constant for Kirchhoff plate systems with an arbit
Computational & Applied Mathematics. Publicado em: 2006
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23. Power system state estimation: computer program for analysis and updating of measurement set qualitative characteristics / Estimação de estado em sistemas elétricos de potência: programa para análise e atualização das características qualitativas de conjunto de medidas
To obtain a safe power system (PS) operation, becomes necessary a reliable state estimation (SE), since the real time control actions of a PS are based on the data obtained through the SE process. The first requirement for a successful SE process is the existence of a reliable measurement placement plan, that is, a measurement placement plan that guarantees
Publicado em: 2006
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24. Approach for transmission line parameter and state estimation / Estimador de estado e parâmetros de linha de transmissão, baseado nas equações normais
O processo de estimação de estado em sistemas elétricos de potência está sujeito a três tipos de erros: erros nas medidas analógicas (erros grosseiros); erros devido a informações erradas quanto aos estados de chaves e/ou disjuntores (erros topológicos) e erros causados por informações erradas de algum parâmetro do sistema (erros de parâmetros)
Publicado em: 2006