Error Decomposition
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. An A Posteriori Error Estimator for a Non Homogeneous Dirichlet Problem Considering a Dual Mixed Formulation
ABSTRACT In this paper, we describe an a posteriori error analysis for a conforming dual mixed scheme of the Poisson problem with non homogeneous Dirichlet boundary condition. As a result, we obtain an a posteriori error estimator, which is proven to be reliable and locally efficient with respect to the usual norm on H d i v ; Ω × L 2 Ω. We remark t
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. A wavelet-based method for power-line interference removal in ECG signals
Abstract Introduction The analysis of electrocardiogram (ECG) signals allows the experts to diagnosis several cardiac disorders. However, the accuracy of such diagnostic depends on the signals quality. In this paper it is proposed a simple method for power-line interference (PLI) removal based on the wavelet decomposition, without the use of thresholding t
Res. Biomed. Eng.. Publicado em: 2018-01
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3. ESTUDO CINÉTICO DE DECOMPOSIÇÃO TÉRMICA DE ESPUMAS RÍGIDAS DE POLIURETANO POR REDE NEURAL ARTIFICIAL
Kinetic models of solid thermal decomposition are traditionally used for individual fit of isothermal experimental data. However, this methodology presents unacceptable errors in some regions of the data. To solve this problem, a neural network was adopted in this work. The implemented algorithm uses the rate constants as predetermined weights between the in
Quím. Nova. Publicado em: 2017-10
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4. THE DEMAND FOR RESIDENTIAL ELECTRICITY IN BRAZIL: 2011-2020 / A DEMANDA POR ENERGIA ELÉTRICA RESIDENCIAL NO BRASIL: 2011-2020
This work aims to quantify the relations between the electricity demand and some of its determinants in the Residential sector of Brazil. To begin with a short discussion is carried out on the Residential energy consumption in the country throughout the last four decades so as to get to know the residential consumption within a wider context. After, we adopt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/05/2012
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5. Estudo da influência da adição de etanol e/ou metanol ao biodiesel associado a ferramentas quimiométricas
The objective of this work is to study the influence of the addition of alcohol methanol or ethanol - to biodiesel. Therefore, Principal Components Analysis (PCA) was combined with infrared spectra with the aim of separating soybean and tallow biodiesel samples with different alcohol contents of ethanol or methanol. PCA yielded a good reduction of data regar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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6. The economics of racial discrimination / Os aspectos econômicos da discriminação racial no Brasil
The objective of this paper is to contribute to a better understanding of the economics of racial discrimination in Brazil, in view of the already documented economic disparity in the outcomes of white and non-white populations. To that end, a comprehensive review of the existing debate in the literature is carried out, defining also the concepts of race and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/03/2012
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7. A Common-Feature Approach for Testing Present-Value Restrictions with Financial Data
It is well known that cointegration between the level of two variables (labeled Yt and yt in this paper) is a necessary condition to assess the empirical validity of a present-value model (PV and PVM, respectively, hereafter) linking them. The work on cointegration has been so prevalent that it is often overlooked that another necessary condition for the PVM
Escola de Pós-Graduação em Economia da FGV. Publicado em: 24/02/2012
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8. Numerical analysis of the nonlinear subgrid scale method
This paper presents the numerical analysis of the Nonlinear Subgrid Scale (NSGS) model for approximating singularly perturbed transport models. The NSGS is a free parameter subgrid stabilizing method that introduces an extra stability only onto the subgrid scales. Thisnew feature comes from the local control yielded by decomposing the velocity field into the
Comput. Appl. Math.. Publicado em: 2012
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9. Um estudo econométrico do consumo e da renda agregados no Brasil
A dissertação analisa os dados de consumo e renda das famílias brasileiras entre os anos de 1947 e 2009. O trabalho visa avaliar em que medida o consumo agregado das famílias brasileiras pode ser bem aproximando a partir de um passeio aleatório puro. O trabalho utiliza técnicas de cointegração de Johansen (1988, 1991) e testes de super exogeneidade n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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10. Estimador de erro a posteriori baseado em recuperação do gradiente para o método dos elementos finitos generalizados / A posteriori error estimator based on gradient recovery for the generalized finite element method
O trabalho aborda a questão das estimativas a posteriori dos erros de discretização e particularmente a recuperação dos gradientes de soluções numéricas obtidas com o método dos elementos finitos (MEF) e com o método dos elementos finitos generalizados (MEFG). Inicialmente, apresenta-se, em relação ao MEF, um resumido estado da arte e conceitos f
Publicado em: 2011
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11. Exchange rate dynamics in Brazil
The paper aims to investigate on empirical and theoretical grounds the Brazilian exchange rate dynamics under floating exchange rates. The empirical analysis examines the short and long term behavior of the exchange rate, interest rate (domestic and foreign) and country risk using econometric techniques such as variance decomposition, Granger causality, coin
Publicado em: 16/06/2010
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12. QR decomposition algorithms for MIMO systems : impact on computational effort and hardware implementations
Dentre as abordagens para se atingir altas taxas de transmissão em sistemas de comunicação sem fio, uma se destaca como muito promissora: sistemas de múltiplas antenas (ou Multiple Input Multiple Output – MIMO), nos quais a informação é transmitida e recebida por mais de uma antena. Tais sistemas podem atingir altas taxas de transmissão usando, ent
Publicado em: 2010