Controllability
Mostrando 25-36 de 36 artigos, teses e dissertações.
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25. Semigroup theory and controllability of neutral systems / Teoria de semigrupos e controlabilidade de sistemas neutros
Neste trabalho de dissertação de mestrado, fazemos algumas observações a respeito de dois¶ artigos de pesquisa recentes, os quais estabelecem resultados falsos sobre existência de soluções controlabilidade exata de sistemas de controle abstratos do tipo neutro modelados na forma¶8<:¶ d ¶ dt ¶(x(t) + G(t, xt)) = Ax(t) + F(t, xt) + Cu(t), t 2 I = (
Publicado em: 2006
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26. The weak stabilizability concept for linear systems with Markov jump / O conceito de estabilizabilidade fraca para sistemas lineares com saltos Markovianos
Este trabalho introduz os conceitos de controlabilidade fraca e estabilizabilidade fraca para sistemas lineares com parâmetros sujeitos a saltos Markovianos a tempo discreto. É, inicialmente, construída uma coleção de matrizes C que se assemelha às matrizes de controlabilidade de sistemas lineares deterministicos. Essa coleção de matrizes C nos permi
Publicado em: 2006
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27. "Controlabilidade do rolamento de uma esfera sobre uma superfície de revolução" / Controllability of the rolling of a ball over a surface of revolution
This work starts by presenting the classical concepts of rolling (without slipping and without slipping or twisting) of a surface over another one, using the Darboux referential frames of the two surfaces along their contact curves. It shows the equivalence between these concepts with other definitions. In the sequel one studies the controllability in the ro
Publicado em: 2005
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28. A Numerical and Experimental Evaluation of ERA and ERA/OKID for Mechanical Systems Identification / Avaliação numérica e experimental dos métodos ERA e ERA/OKID para a identificação de sistemas mecânicos
This work presents two algorithms of identification of state-space linear systems, as follows: ERA (Eigensystem Realization Algorithm), developed by Juang and Pappa (1985), and ERA/ OKID (Observer/ Kalman Filter Identification), by Phan et al. (1992). Both were conceived at the environment of Aerospace Engineering, where it was indispensable the appearance o
Publicado em: 2005
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29. Finite approximate controllability for semilinear heat equations in noncylindrical domains
Este artigo é dedicado ao estudo da controlabilidade finito-aproximada para a equação não linear de transferência de calor em domínios com fronteira móvel. A demonstração do resultado principal baseia-se no princípio de continuação única de Carolina Fabre 1996 e em argumentos de ponto fixo do tipo Leray-Schauder.
Anais da Academia Brasileira de Ciências. Publicado em: 2004-09
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30. Approximate controllability for the semilinear heat equation in R N involving gradient terms
We prove the approximate controllability of the semilinear heat equation in R N, when the nonlinear term is globally Lipschitz and depends both on the state u and its spatial gradient Ñu. The approximate controllability is viewed as the limit of a sequence of optimal control problems. In order to avoid the difficulties related to th
Computational & Applied Mathematics. Publicado em: 2003
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31. Application of the RPN methodology for quantification of the operability of the quadruple-tank process
The RPN indicates how potentially difficult it is for a given system to achieve the desired performance robustly. It reflects both the attainable performance of a system and its degree of directionality. Two new indices, RPN ratio and RPN difference are introduced to quantify how realizable a given desired performance can be. The predictions made by RPN are
Brazilian Journal of Chemical Engineering. Publicado em: 2002-04
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32. The importance of control considerations for heat exchanger network synthesis: a case study
Cost optimization in the synthesis decision tree often leads to a reduced degree of freedom which degrades the process’s ability to reject disturbances as a consequence of low controllability. In fact, Heat Exchanger Networks (HENs) obtained by traditional synthesis procedures that ignore controllability aspects must be evaluated in this context a posterio
Brazilian Journal of Chemical Engineering. Publicado em: 2001-06
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33. ON THE CONTROLLABILITY OF A NONLINEAR SYSTEM*
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34. WEIGHTING PATTERNS AND THE CONTROLLABILITY AND OBSERVABILITY OF LINEAR SYSTEMS*
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35. On the controllability of distributed systems
To “control” a system is to make it behave (hopefully) according to our “wishes,” in a way compatible with safety and ethics, at the least possible cost. The systems considered here are distributed—i.e., governed (modeled) by partial differential equations (PDEs) of evolution. Our “wish” is to drive the system in a given time, by an adequa
The National Academy of Sciences of the USA.
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36. Doxycyline regulation in a single retroviral vector by an autoregulatory loop facilitates controlled gene expression in liver cells
The tetracycline system has limitations in liver cells, such as toxic effects and low controllability. We generated different retroviral vectors for controlled gene expression in liver cells, in which the regulatory elements were arranged in different patterns. Only the organization of the tetracycline system in an autoregulatory loop in the sense orientatio
Oxford University Press.