Statistical Alarm
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Two-dimensional Determination of the Decision Boundary for a Radar Detection Method in the Moment Space
ABSTRACT: The radar detection with decision making in the moments space (DRACEC method) is based on a statistical analysis to determine the boundary between the background (absent target) and the anomaly (present target) classes. In this article, the boundary is taken as an ellipse and is calculated for two dimensions, emphasizing its geometric interpretatio
J. Aerosp. Technol. Manag.. Publicado em: 09/05/2019
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2. Verificação da previsão do tempo em São Paulo com o modelo operacional WRF / Review of weather in São Paulo with the WRF Operational Model.
Forecasts of daily maximum and minimum temperatures and rainfall performed by the operational numerical weather prediction WRF (Weather Research Forecasting) model in the São Paulo are evaluated. Initial and boundary conditions provided by the 00UTC Global Forecast System (GFS) Model and WRF run for 72 hours, with two nested grids (with horizontal grid spac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/11/2012
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3. Target detection on sea surface using orbital SAR images / Detecção de alvos na superfície do mar utilizando imagens SAR orbitais
Target detection over ocean surface is very important to national security, once that Brazilian legal waters are the entrance for thounsands foreign ships every year, representing almost totally the Brazilian international trade. However, due to Brazilian coast size approximately 7,500 km is undoable to patrolling whole coastline only with Brazilian Navy (Ma
Publicado em: 2009
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4. In-process grinding monitoring through acoustic emission
This work aims to investigate the efficiency of digital signal processing tools of acoustic emission signals in order to detect thermal damages in grinding processes. To accomplish such a goal, an experimental work was carried out for 15 runs in a surface grinding machine operating with an aluminum oxide grinding wheel and ABNT 1045 Steel as work material. T
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-03
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5. Um sistema presa-predador com evasão mediada por feromônio de alarme / A predator-prey model with pursuit and evasion triggered by alarm pheromones
Pattern, structure and emergent collective properties are ubiquitous in systems with many units (alive or inanimated) coupled through nonlinear interactions. Within this context, the study of cooperative phenomena in population dynamics of ecological interest has attracted the attention of the mathematicians and physicists since Lotka and Volterra in the 192
Publicado em: 2006
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6. Automatic diagnoses of rolling bearing failures based in fuzzy logic. / Diagnóstico automático de defeitos em rolamentos baseado em lógica fuzzy
This works describes two proposed methodologies for the automatic diagnoses in mechanical equipment: the fuzzy system inference and a Fuzzy C-Means based algorithm. Their performances are evaluated in an experimental case and, afterwards, also compared by the statistical alarm, a diagnostic methodology very used in industries at present. In order to do the t
Publicado em: 2005
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7. Self-tuned vehicle parameters detection and estimation from vÃdeo sequences for traffic incident management.
This work proposes and compares three algorithms for vehicle detection, composed of two main stages, preprocess and process. The first will proceed with the selection of the region of interest (ROI) and the background learning phase. The ROI is a narrow and transversal-to-lane rectangular area wherein detection is achieved, its dimensions provides low proces
Publicado em: 2005