Ensemble Method
Mostrando 1-12 de 71 artigos, teses e dissertações.
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1. Discrete element modeling of non-spherical particles using a spherical shape
Abstract Real non-spherical particles can be modeled using the Discrete Element Method (DEM) with sphere clusters, superquadrics, or polyhedral particles. However, in applications involving a considerable number of particles, the analysis can become impracticable. The goal of this study is to demonstrate how well spherical particles can reproduce the flow of
REM, Int. Eng. J.. Publicado em: 2020-09
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2. Considering the impact of observation error correlation in ensemble square-root Kalman filter
Abstract Data assimilation has been developed into an effective technology that can utilize a large number of multi-source unconventional data. It cannot only provide the initial field for the ocean numerical prediction model, but also construct the ocean reanalysis datasets and provide the design basis for the ocean observation plan. In data assimilation, t
Braz. j. oceanogr.. Publicado em: 02/12/2019
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3. Integrating climate models into hydrological modelling: What’s going on in Brazil?
RESUMO Estudos que integram modelagem climática em modelagem hidrológica têm crescido substancialmente nas últimas duas décadas em todo o mundo; entretanto, pouco se sabe sobre estes no território brasileiro. O objetivo deste estudo é identificar como a comunidade científica tem lidado com o tema no Brasil. O estudo baseia-se numa revisão sistemáti
RBRH. Publicado em: 01/07/2019
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4. Data assimilation using the ensemble Kalman filter in a distributed hydrological model on the Tocantins River, Brasil
RESUMO Neste trabalho, o método de assimilação de dados por filtro de Kalman por conjunto (EnKF) é aplicado na bacia do rio Tocantins. Esse método atualiza as vazões do rio usando um modelo hidrológico distribuído. O desempenho de EnKF é também comparado com um método de assimilação empírico a intervalos de tempo horário, onde duas aplicaçõ
RBRH. Publicado em: 04/04/2019
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5. Método baseado em rotação e projeção otimizadas para a construção de ensembles de modelos / Ensemble method based on optimized rotation and projection
The development of new techniques capable of inducing predictive models with low generalization errors has been a constant in machine learning and other related areas. In this context, the composition of an ensemble of models should be highlighted due to its theoretical and empirical potential to minimize the generalization error. Several methods for buildin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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6. Video segmentation based on motion coherence of particles in a video sequence
This work describes an approach for object-oriented video segmentation based on motion coherence. Using a tracking process based on adaptively sampled points (namely, particles), 2-D motion patterns are identified with an ensemble clustering approach. Particles are clustered to obtain a pixel-wise segmentation in space and time domains. The segmentation resu
Publicado em: 2011
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7. Previsão de ondas oceânicas por ensemble : uma revisão e estudo de caso
The ensemble numerical prediction of ocean waves is considered and all published works on this new topic in Geosciences are reviewed. A Wave Ensemble Prediction System is described where a global third-generation wave model is adopted. Twenty members are generated by a method based on Empirical Orthogonal Functions and a particular realistic case where sever
Publicado em: 2010
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8. Assimilação de dados com redes neurais artificiais em modelo de circulação geral da atmosfera / Data assimilation with artificial neural networks in atmospheric general circulation model
Weather forecasting systems require a model for the time evolution and an estimate of the current state of the system. The numerical weather prediction (NWP) incorporates the equations of atmospheric dynamics with physical process and it can predict the future state of the atmosphere. Data assimilation provides such an initial estimate of the atmosphere wher
Publicado em: 2010
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9. Topologia, Simetria e transições de fase em Modelos de Spin
We use a topological approach to describe the frustration- and field-induced phase transitions exhibited by the infinite-range XY model on the AB2 chain, including noncollinear spin structures. For this purpose, we have computed the Morse number and the Euler characteristic, as well as other topological invariants, which are found to behave similarly as func
Publicado em: 2009
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10. Estudo das características das perturbações EOF extratropicais e seu impacto na previsão de tempo de médio prazo por conjunto
- The characteristics of the extratropical EOF perturbations are studied and their impact on the medium range ensemble weather prediction is evaluated, using simulations with the Center for Weather Prediction and Climate Studies Ensemble Weather Prediction System (CPTEC-EPS). The EOF method, originally applied over tropical regions and for horizontal wind an
Publicado em: 2008
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11. Da leitura de partituras musicais à transcrição/arranjo para conjuntos de câmara.
The practice of transcribing/arranging piano scores into chamber music compositions for young ensemble performing students was not been done in class, in the Musical Training Courses I and II or in the Advanced Music Course at the Escola de Música e Belas Artes do Paraná (EMBAP Brazil). The ideal of providing a chamber music experience to young instrument
Publicado em: 2008
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12. Atomistic simulation of rare events using Transition Path Sampling / Simulações atomisticas de eventos raros atraves de Transition Path Sampling
Nesta dissertação abordamos o estudo de uma das limitações da simulação atomística denominada o evento raro, quem é responsável pela limitação temporal, exemplos de problemas que envolvem os eventos raros são, o enovelamento de proteínas, mudanças conformacionais de moléculas, reações químicas (em solução), difusão de sólidos e os proce
Publicado em: 2007