Oversampling
Mostrando 1-11 de 11 artigos, teses e dissertações.
-
1. Wrappers Feature Selection in Alzheimer’s Biomarkers Using kNN and SMOTE Oversampling
RESUMO Biomarcadores são medidas biológicas que ajudam a rastrear e compreender a progressão fisiopatológica de várias doenças. A combinação de diferentes modalidades de biomarcadores muitas vezes permite uma classificação de diagnóstico preciso. Na doença de Alzheimer (DA), os biomarcadores são indispensáveis para identificar indivíduos cogni
TEMA (São Carlos). Publicado em: 2017-04
-
2. Internalizing disorders and quality of life in adolescence: evidence for independent associations
Objective: To investigate whether internalizing disorders are associated with quality of life (QoL) in adolescents, even after accounting for shared risk factors. Methods: The sample comprised 102 adolescents from a community cross-sectional study with an oversampling of anxious subjects. Risk factors previously associated with QoL were assessed and divided
Rev. Bras. Psiquiatr.. Publicado em: 11/06/2014
-
3. Algoritmo de aprendizado supervisionado - baseado em máquinas de vetores de suporte - uma contribuição para o reconhecimento de dados desbalanceados / Supervised learning Algorithm - Based on Support Vector Machines - A Contribution to the Recognition of Unbalanced Data
The machine learning in datasets that have unbalanced classes, has received considerable attention in the scientific community, because the traditional classification algorithms dont provide a satisfactory performance. This low performance can be explained by the fact that the traditional techniques of machine learning consider that each class present in the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/09/2011
-
4. Um Estudo de Limpeza em Base de Dados Desbalanceada e com Sobreposição de Classes
O objetivo geral desta pesquisa é analisar técnicas para aumentar a acurácia de classificadores construídos a partir de bases de dados desbalanceadas. Uma base de dados é desbalanceada quando possui muito mais casos de uma classe do que das outras, portanto possui classes raras. O desbalanceamento também pode ser em uma mesma classe se a distribuição
Publicado em: 2007
-
5. RECEPÇÃO CEGA DE SEQUÊNCIAS EXPLORANDO SUPERAMOSTRAGEM / BLIND RECEPTION OF SEQUECIES EXPLORING OVERSAMPLING
Propõe-se alternativas para exploração da amostragem a taxas múltiplas da taxa símbolos (superamostragem) em receptores cegos com decisão de sequências de símbolos, a fim de se obter melhoria de desempenho em canais com desvanecimento rápido e seletivo em frequência. O trabalho se centra em esquemas de recepção do tipo MLSE/PSP (maximum likelihoo
Publicado em: 1998
-
6. Self-organized queuing and scale-free behavior in real escape panic
Numerical investigations of escape panic of confined pedestrians have revealed interesting dynamical features such as pedestrian arch formation around an exit, disruptive interference, self-organized queuing, and scale-free behavior. However, these predictions have remained unverified because escape panic experiments with real systems are difficult to perfor
National Academy of Sciences.
-
7. Timing and Reconstruction of the Most Recent Common Ancestor of the Subtype C Clade of Human Immunodeficiency Virus Type 1
Human immunodeficiency virus type 1 (HIV-1) subtype C is responsible for more than 55% of HIV-1 infections worldwide. When this subtype first emerged is unknown. We have analyzed all available gag (p17 and p24) and env (C2-V3) subtype C sequences with known sampling dates, which ranged from 1983 to 2000. The majority of these sequences come from the Karonga
American Society for Microbiology.
-
8. Imaging whole Escherichia coli bacteria by using single-particle x-ray diffraction
We report the first experimental recording, to our knowledge, of the diffraction pattern from intact Escherichia coli bacteria using coherent x-rays with a wavelength of 2 Å. By using the oversampling phasing method, a real space image at a resolution of 30 nm was directly reconstructed from the diffraction pattern. An R factor used for characterizing the
The National Academy of Sciences.
-
9. An approach to three-dimensional structures of biomolecules by using single-molecule diffraction images
We describe an approach to the high-resolution three-dimensional structural determination of macromolecules that utilizes ultrashort, intense x-ray pulses to record diffraction data in combination with direct phase retrieval by the oversampling technique. It is shown that a simulated molecular diffraction pattern at 2.5-Å resolution accumulated from m
The National Academy of Sciences.
-
10. Noise aliasing and the 3D NEQ of flat-panel cone-beam CT: Effect of 2D∕3D apertures and sampling
The ability to tune an imaging system to be optimal for a specific task is an essential component of image quality. This article discusses the ability to tune the noise-equivalent quanta (NEQ) of cone-beam computed tomography (CBCT) by managing noise aliasing through binning of data at different points in the reconstruction cascade. The noise power spectrum,
American Association of Physicists in Medicine.
-
11. Results of the ACSUS for pediatric AIDS patients: utilization of services, functional status, and social severity.
OBJECTIVE. This study describes demographic characteristics of pediatric AIDS patients, describes hospital and community-based service utilization patterns, and analyzes medical and social support service usage patterns with respect to patient demographic characteristics, clinical trial participation, functional/developmental status, and social environment.