نتایج جستجو برای: em
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Los Angeles and Orange Counties are known endemic areas for murine typhus in California; however, no recent reports of flea-borne rickettsioses are known from adjacent San Bernardino County. Sixty-five opossums (Didelphis virginiana) were trapped in the suburban residential and industrial zones of the southwestern part of San Bernardino County in 2007. Sixty out of 65 opossums were infested wit...
OBJECTIVE To evaluate how continuation of and alterations to initial year 1 combination etanercept-methotrexate (MTX) therapy and MTX monotherapy regimens affect long-term remission and radiographic progression in early, active rheumatoid arthritis. METHODS Subjects were randomized at baseline for the entire 2-year period; those who completed 1 year of treatment with combination or MTX monoth...
Usando um espectrômetro baseado em um SQUID (dispositivo supercondutor de interferência quântica), de alta temperatura de transição, polarizado continuamente, medimos sinais de ressonância magnética nuclear (RMN) de várias amostras a temperatura ambiente em campos magnéticos na faixa entre 0,05 mT e 2 mT. É possível observar sinais de prótons em uma amostra com 1 mL de óleo mineral em 2 mT com ...
Bayesian networks (BN) are used in a big range of applications but they have one issue concerning parameter learning. In real application, training data are always incomplete or some nodes are hidden. To deal with this problem many learning parameter algorithms are suggested foreground EM, Gibbs sampling and RBE algorithms. In order to limit the search space and escape from local maxima produce...
By means of the generalized Galilei covariant EM field equations, the EM potentials and EM fields of a charged particle moving with an arbitrary nonuniform velocity v(t) in an inertial frame with substratum flow w are calculated. It is shown that the dynamic EM fields are excitations of the EM ether caused by the motion v(t) — w of the charge relative to the wave carrier with velocity w. Qualit...
1 Programa de Pós-Graduação em Saúde Coletiva, Faculdade de Medicina, Universidade Federal de Juiz de Fora, UFJF; Núcleo Interdisciplinar de Estudos do Desenvolvimento Infantil NIEDI, Faculdade de Fisioterapia, UFJF; 3Núcleo de Assessoria, Treinamento e Estudos em Saúde NATES, UFJF, Juiz de Fora, MG, Brasil. 2 Mestre em Saúde Coletiva (UFJF), Departamento de. Saúde Coletiva Faculdade de Medicin...
The Expectation-Maximization (EM) algorithm is a very general and popular iterative computational algorithm to find maximum likelihood estimates from incomplete data and broadly used to statistical analysis with missing data, because of its stability, flexibility and simplicity. However, it is often criticized that the convergence of the EM algorithm is slow. The various algorithms to accelerat...
یکی از روش های برآورد پارامترها بعد از مشاهده، روش ماکسیمم درستنمایی است. اگر بردار مشاهدات غیرکامل باشد. یعنی، برخی از داده ها به دلیل سانسور شدن یا مقاذیر گمشده در دسترس نباشند، می توان از روش های تکرارشونده همچون روش نیوتن-رافسون و الگوریتم امید ریاضی بیشینه سازی یا به اختصار الگوریتم em برای برآورد پارامترها استفاده کرد.
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