Non Stationary Processes
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Analysis of a tuned liquid column damper in non-linear structures subjected to seismic excitations
Abstract The behavior of the tuned liquid column damper (TLCD) is analyzed in the control of non-linear structures subjected to random seismic excitations. The structure is modeled as a system of one degree of freedom with incursion in the non-linear range. The Bouc-Wen hysteretic model is used to model the non-linear behavior of the structure. A stationary
Lat. Am. j. solids struct.. Publicado em: 19/07/2018
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2. LINEAR STABILITY ANALYSIS AND CFD SIMULATION OF DOUBLE-LAYER RAYLEIGH-BÉNARD CONVECTION
Abstract Natural convection in superimposed layers of fluids heated from below is commonly observed in many industrial and natural situations, such as crystal growth, co-extrusion processes and atmospheric flow. The stability analysis of this system reveals a complex dynamic behavior, including the potential multiplicity of stationary states and occurrence o
Braz. J. Chem. Eng.. Publicado em: 2016-09
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3. A new particle-like method for high-speed flows with chemical non-equilibrium
Abstract: The present work is concerned with the numerical simulation of hypersonic blunt body flows with chemical non-equilibrium. New theoretical and numerical formulations for coupling the chemical reaction to the fluid dynamics are presented and validated. The fluid dynamics is defined for a stationary unstructured mesh and the chemical reaction process
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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4. Modelos de séries temporais com coeficientes variando no tempo
In this work they are presented extensions of Auto Regressive and Auto Regressive Conditional Heteroscedasticity models with coefficients varying in time. These coefficients have been used as models for non stationary real time series, specially for financial series. The objective of this work is to present the models and the techniques involved in estimatin
Publicado em: 2009
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5. 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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6. Extração de preferências por meio de avaliações de comportamentos observados. / Preference elicitation using evaluation over observed behaviours.
Recently, computer systems have been delegated to accomplish a variety of tasks, when the computer system can be more reliable or when the task is not suitable or not recommended for a human being. The use of preference elicitation in computational systems helps to improve such delegation, enabling lay people to program easily a computer system with their ow
Publicado em: 2009
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7. On superstatistical multiplicative-noise processes
In this article we analyse the long-term probability density function of non-stationary dynamical processes with time varying multiplicative noise exponents which are enclosed inwards the Feller class of processes. The update in the value of the exponent occurs in the same conditions as presented by BECK and COHEN for superstatistics. Moreover, we are able t
Brazilian Journal of Physics. Publicado em: 2008-06
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8. Transition models for binary data / Modelos de transição para dados binários
Binary or dichotomous data are quite common in many fields of Sciences in which there is an interest in registering the occurrence of a particular event. On the other hand, when each sampled unit is evaluated in more than one occasion, we have longitudinal data or repeated measures over time. It is also common, in longitudinal studies, to have explanatory va
Publicado em: 2007
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9. Transientes, monoestabilidade e biestabilidade em processos de oxidação de eletrodos metálicos com formação de filmes : alguns casos simples
The simulation of simple models studied in this thesis showed that experimental current density/potential curves from processes of metal electrode oxidation with film formation can present peaks or discontinuities besides these curves can present the polarographic wave shape (sigmoidal shape). The experimental current density/potential curves wouldnt present
Publicado em: 2005
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10. ONLINE TRAINING OF NEURAL METWORKS: METHODOLOGY FOR TIME VARYING ENVIRONMENTS / TREINAMENTO CONTÍNUO EM REDES NEURAIS: UM TRATAMENTO PARA AMBIENTES VARIANTES NO TEMPO
The main issue when dealing with non-stationary processes is related to the requirement of fast adaptation while simultaneously preventing catastrophic damage to previously learned behavior. In this thesis, two on-line learning techniques, one for supervised and the other for unsupervised artificial neural networks, are proposed. A new supervised procedure t
Publicado em: 1998
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11. Non-Gaussian autoregressive moving average processes.
Non-Gaussian stationary autoregressive moving average sequences are considered. Under conditions concerning smoothness and positivity of the density function of the independent random variables generating the sequence, asymptotically efficient methods for the estimation of unknown coefficients of the model are described. The main interest is in nonminimum-ph
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12. Universality in the brain while listening to music.
The human brain, which is one of the most complex organic systems, involves billions of interacting physiological and chemical processes that give rise to experimentally observed neuroelectrical activity, which is called an electroencephalogram (EEG). The presence of non-stationarity and intermittency render standard available methods unsuitable for detectin