Signal Noise Relation
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Avaliation of figures of merit in multivariate calibration in the determination of quality control parameters in alcohol industry by near infrared spectroscopy / Avaliação de figuras de merito em calibração multivariada na determinação de parametros de controle de qualidade em industria alcooleira por espectroscopia no infravermelho proximo
Soluble solids (Brix), sucrose (Pol) and Reducing Sugar (RS) are important properties in the quality control of alcohol industry to determine grower payment. Thus, the validation was achieved through determination of figures of merit for multivariate calibration models using near infrared spectroscopy (NIR) in region of 1100 - 2500 nm by partial least square
Publicado em: 2005
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14. Obtenção de uma matriz de quantização otimizada para imagens de ultra-sonografia e ressonância magnética
A quantidade de imagens médicas está crescendo, e em hospitais e clínicas onde o número de pacientes é grande, o espaço requerido para todas essas informações é muito grande, o que torna-se um problema. Uma das formas de diminuir esse problema é comprimir essas imagens. O objetivo deste trabalho é obter uma matriz de quantização para imagens de
Publicado em: 2005
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15. ObtenÃÃo de uma matriz de quantizaÃÃo otimizada para imagens de ultra-sonografia e ressonÃncia magnÃtica
A quantidade de imagens mÃdicas està crescendo, e em hospitais e clÃnicas onde o nÃmero de pacientes à grande, o espaÃo requerido para todas essas informaÃÃes à muito grande, o que torna-se um problema. Uma das formas de diminuir esse problema à comprimir essas imagens. O objetivo deste trabalho à obter uma matriz de quantizaÃÃo para imagens de
Publicado em: 2005
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16. METROLOGICAL EVALUATION OF OPTICAL EMITTERS AND DETECTORS APPLIED TO THE CHARACTERIZATION OF ATMOSPHERIC PARTICULATES POLLUTANTS / AVALIAÇÃO METROLÓGICA DE EMISSORES E DETECTORES ÓPTICOS APLICADOS À CARACTERIZAÇÃO DE POLUENTES PARTICULADOS ATMOSFÉRICOS
The atmospheric pollution is a latent world-wide problem, and it is harmful to the health, visibility and climate. For these factors, several studies and researches have been developed to characterize the chemical composition of the pollutants, concentration, size of particles, etc, with the objective of constructing adjusted instruments for the control of t
Publicado em: 2003
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17. Desempenho de sistemas CDMA com detector multi-usuario descorrelacionador
: ln this study, simpIe and precise expressions for the mean asymptotic multiuser efficiency of synchronous and asynchronous CDMA systems using multiuser decorrelating detection (MUD-D) are obtained. Expressions for the signal-interference plus noise ratio (SlNR) gain of MUD-D in relation to the conventional detection on AWGN and frequency-selective and non
Publicado em: 2002
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18. Algoritmo SOM com estrutura hierárquica e dinâmica aplicado a compressão de imagens
ln this work the implementation of the SOM (Self Organizing Maps) algorithm or Kohonen neural network is presented in the form of hierarchical structures, applied to the compression of images. The main objective of this approach is to develop an Hierarchical SOM algorithm with static structure and another one with dynamic structure to generate codebooks (boo
Publicado em: 2002
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19. Uma nova tecnica de detecção de sinais de giroscopio a fibra optica usando "Zero Crossing" com clock sincrono
The objective of this work is to study a new interferometric signal processing technique of fiber optic gyroscope based on zero crossing. A digital demodulation method was developed using this technique which allows the detection of a Sagnac phase difference, proportional to the system rotation rate, measuring time intervals difference determined by zero cro
Publicado em: 1999
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20. Mistura e geração experimental de sinais de microonda empregando amplificadores opticos semicondutores
Recently, the development of techniques that allow optical transmission and generation of microwave and millimetre-wave signals have received significant attention, mainly due to the fact that considerably low-noise optical wavelenght-division multiplexed systems are available to transmit large amounts of data throughout many points interconnected by optical
Publicado em: 1998
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21. Vibro-acoustography: An imaging modality based on ultrasound-stimulated acoustic emission
We describe theoretical principles of an imaging modality that uses the acoustic response of an object to a highly localized dynamic radiation force of an ultrasound field. In this method, named ultrasound-stimulated vibro-acoustography (USVA), ultrasound is used to exert a low-frequency (in kHz range) force on the object. In response, a portion of the objec
The National Academy of Sciences.
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22. Delay accuracy in bat sonar is related to the reciprocal of normalized echo bandwidth, or Q
Big brown bats (Eptesicus fuscus) emit wideband, frequency-modulated biosonar sounds and perceive the distance to objects from the delay of echoes. Bats remember delays and patterns of delay from one broadcast to the next, and they may rely on delays to perceive target scenes. While emitting a series of broadcasts, they can detect very small changes in delay
National Academy of Sciences.