Approximate Entropy
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Respostas autonômicas de recém-nascidos prematuros ao posicionamento do corpo e ruídos ambientais na unidade de terapia intensiva neonatal
RESUMO Objetivo: Avaliar as respostas fisiológicas e do sistema nervoso autônomo de recém-nascidos prematuros ao posicionamento do corpo e ruídos ambientais na unidade de terapia intensiva neonatal. Métodos: Este foi um estudo quasi-experimental. O sistema nervoso autônomo de recém-nascidos foi avaliado com base na variabilidade da frequência card�
Rev. bras. ter. intensiva. Publicado em: 14/10/2019
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2. Linear and nonlinear analysis of heart rate variability in healthy subjects and after acute myocardial infarction in patients
The objectives of this study were to evaluate and compare the use of linear and nonlinear methods for analysis of heart rate variability (HRV) in healthy subjects and in patients after acute myocardial infarction (AMI). Heart rate (HR) was recorded for 15 min in the supine position in 10 patients with AMI taking β-blockers (aged 57 ± 9 years) and in 11 hea
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-05
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3. Caracterização da conectividade entre regiões cerebrais via entropia aproximada e causalidade de Granger. / Brain connectivity characterization via approximate entropy and Granger causality.
Essa dissertação apresenta o desenvolvimento métodos para caracterização da conectividade entre séries temporais neurofisiológicas. Utilizam-se metodologias provenientes da Teoria da Informação Entropias Aproximada e Amostral para representar a complexidade da série no tempo, o que permite inferir como sua variabilidade se transfere a outras sequê
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/2011
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4. A comparison of hyperbolic solvers for ideal and real gas flows
Classical and recent numerical schemes for solving hyperbolic conservation laws were analyzed for computational efficiency and application to nonideal gas flows. The Roe-Pike approximate Riemann solver with entropy correction, the Harten second-order scheme and the extension of the Roe-Pike method to second-order by the MUSCL strategy were compared for one-d
Brazilian Journal of Chemical Engineering. Publicado em: 2006-09
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5. Moscas dos generos Hippelates Loew, 1863 e Liohippelates Duda, 1929 (Diptera: Chloropidae) : levantamento, sazonalidade e parametros biologicos
Liohippelates peruanus (Becker) (Diptera: Chloropidae) is one of the most abundant species in the city of Campinas, São Paulo state and it has been described as mechanical vector of the bacteria Haemophilus aegyptius, the agent of conjunctivitis and of the Brazilian Purpuric Fever (Paganelli &Sabrosky 1993), it occurs in larger number in the hottest periods
Publicado em: 2005
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6. Approximate Entropy as a measure of complexity in sap flow temporal dynamics of two tropical tree species under water deficit
Entropia Aproximada (ApEn), um modelo estatístico independente para quantificar irregularidade em séries temporais, foi utilizada para avaliar alterações na dinâmica temporal do fluxo de seiva em duas espécies arbóreas tropicais submetidas à deficiência hídrica. A deficiência hídrica induziu uma grande redução no fluxo de seiva em G. ulmifolia,
Anais da Academia Brasileira de Ciências. Publicado em: 2004-09
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7. Esquemas de alta resolução para controle da dispersão numerica em simulação de reservatorios
Standard finite-diference reservoir simulation normally uses single-point upstream welghting to approximate the components of the convective flow term at the interfaces between blocks. This procedure stabilizes the numerical solution, but introduces high levels of numerical dispersion, difficulting the correct interpretation of the simulated results. Exponen
Publicado em: 1991
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8. Approximate entropy as a measure of system complexity.
Techniques to determine changing system complexity from data are evaluated. Convergence of a frequently used correlation dimension algorithm to a finite value does not necessarily imply an underlying deterministic model or chaos. Analysis of a recently developed family of formulas and statistics, approximate entropy (ApEn), suggests that ApEn can classify co
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9. Basal, Pulsatile, Entropic (Patterned), and Spiky (Staccato-like) Properties of ACTH Secretion: Impact of Age, Gender, and Body Mass Index
Background: Age, gender, and BMI determine ultradian modes of LH and GH secretion, viz., pulsatile, basal, pattern-defined regularity [approximate entropy (ApEn)] and spikiness (sharp, brief excursions). Whether the same determinants apply to ACTH secretion is not known.
The Endocrine Society.
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10. On the stability of nucleic acid structures in solution: enthalpy-entropy compensations, internal rotations and reversibility.
The thermodynamics of self-association (stacking) of free bases and nucleotides, intramolecular stacking in dinucleotides, nearest-neighbour base pair stacking interactions in duplex DNA and RNA, and the formation of hairpin loops illustrate enthalpy/entropy compensations. Large stacking exothermicities are associated with large negative entropy changes that
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11. Approximating Markov chains.
A common framework of finite state approximating Markov chains is developed for discrete time deterministic and stochastic processes. Two types of approximating chains are introduced: (i) those based on stationary conditional probabilities (time averaging) and (ii) transient, based on the percentage of the Lebesgue measure of the image of cells intersecting
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12. One-sided difference schemes and transonic flow
Two one-sided conservation form difference approximations to a scalar one-dimensional convex conservation law are introduced. These are respectively of first- and second-order accuracy and each has the minimum possible band-width. They are nonlinearly stable, they converge only to solutions satisfying the entropy condition, and they have sharp monotone profi