Acoustic Modeling
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Modelagem endoscÃpica virtual do monitoramento de equipamentos elÃtricos de alta tensÃo
With the promulgation of the 10.847/2004 and 10.848/2004 Laws, the Brazilian Power Sector started adopting competitiveness as the main element for obtaining concessions in the electric power system transmission and generation sectors. In this sense, the power sector companies will have to strongly intensify the monitoring processes of the power system equipm
Publicado em: 2007
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14. CirculaÃÃo hidrodinÃmica na regiÃo costeira dos municÃpios de Recife e JaboatÃo dos Guararapes durante o verÃo austral
The SisBaHia model system was used to analyze the hydrodynamic circulation and the sediment transport potential on the coastal region of Recife and JaboatÃo dos Guararapes cities during the austral summer. In the first part of the study, the results of the hydrodynamic model were analyzed and compared with the experimental data gathered at sea with the Acou
Publicado em: 2007
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15. Simulation of the acoustic wave propagation using a digital waveguide mesh / SimulaÃÃo da propagaÃÃo de ondas acÃsticas atravÃs de uma malha de guias digitais de ondas
This work was developed looking at the construction of a computational tool, aimed to the acoustic modeling of reverberation environment. In this way, it was necessary to elaborate a numerical system able to simulate the wave sound propagation and, mainly its interactions with the surfaces encountered in the analyses. These interactions represent the basic w
Publicado em: 2006
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16. Auralização : tecnicas de modelagem e simulação binaural de ambientes acusticos virtuais
Auralization is a term used to signify the techniques that render audible a sound field through the mathematical or physical modeling of the sound source, the acoustic space and the listener. The present work aims to analyse fully computed process of modeling to the constitution of virtual acoustics environments that can be implemented and interactively simu
Publicado em: 2005
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17. Influencia da forma urbana em ambiente sonoro : um estudo no bairro Jardins em Aracaju (SE)
Environmental noise pollution resulting from the combination of various noise sources, such as, alarms, sirens, commercial activities and services, religious temples, industries, civil engineering works and the traffic of automobile vehicles, have increased the level of urban noise and contributed to the appearance of sound environments that are more and mor
Publicado em: 2005
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18. Efeitos da Segmentação em Sistemas Híbridos ANN+HMM
The Hidden Markov Models has become the widely used speech recognition framework due to its solid probabilistic approach. However, this robustness is damaged when the Markov chains are trained under the maximum likelihood method, which is poor in discriminative power. Until now several efficient techniques and algorithms have been developed to increase the p
Publicado em: 2005
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19. MODELAGEM ACÚSTICA NO DOMÍNIO DA TRANSFORMADA WAVELET / ACOUSTIC MODELING IN THE WAVELET TRANSFORM DOMAIN
Seismic signal processing is a key step to oil exploration. The path between data acquisition and seismic interpretation is composed by a sequence of interdependent processes, among which are modeling and migration processes. A 2D acoustic modeling algorithm in wavelet Transform domain, based on custom tools and tools already made known in literature is pres
Publicado em: 2004
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20. {Kinetic simulations to modeling events in space plasmas} / Simulação cinéticas para modelagens de fenômenos em plasma espaciais
- The purpose of this doctoral thesis is to study some phenomena in space plasma using theoretical models and computer simulation via particles. Firstly, we concentrate on studying the process involving nonlinear interactions among Langmuir, electromagnetic and ion acoustic waves, associated with type III solar radio bursts. Starting from the generalized Zak
Publicado em: 2004
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21. Analise vibro-acustica utilizando o metodo de elementos finitos com mapeamento Dirichlet-to-Neumann (DtN)
This work were interested in finding a method of fluid-structure coupling with infinite fluid medium. After a literature analysis in infinite fluid medium modeling, were adopted the Dirichlet-to-Neumann (DtN) Method, wich is exact, non refiexive and can be directly included in the Finite Element Method (FEM) wich is used in fluid-structure modeling. First, t
Publicado em: 1999
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22. Segmentação automatica e treinamento discriminativo aplicados a um sistema de reconhecimento de digitos conectados
Hidden Markov Model is actually the main approach to Speech Recognition problem, because of the good performance and high degree of flexibility that can be achieved. Unfortunately, this acoustical modeling is not optimum and some problems still affect it s robustness and performance in a more realistic condition. The weakness of the temporal modeling embedde
Publicado em: 1999
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23. Inversão sismoestratigrafica 2D aplicada a Caracterização de um reservatorio delgado
The purpose of this work is to estimate thin reservoir properties even without counting on a good quality and a homogeneous database. Following a regional geological setting, well data such as logs, reports, cores, has led to an interpretation of the depositional model in which the sandstone interval is inserted as an estuary filling an incised valley system
Publicado em: 1998
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24. 1D SEISMIC INVERSION USING SIMULATED ANNEALING / A INVERSÃO SÍSMICA 1D USANDO O SIMULATED ANNEALING
The seismic inverse problem involves determining the subsurface physical properties from data sampled at Earth`s surface. A mathematical model of the response of the subsurface excited by a seismic source, having physical properties as parameters, provides a synthetic model for this response. This makes possible to compare sampled and synthetic data. The per
Publicado em: 1997