Signal Compression
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. Continuous Scanning Technique with Barkhausen Magnetic Noise for Carbon Steel Sheets
This work studies the application of a Non-Destructive Inspection Technique (NDIT), based on the Magnetic Barkhausen Noise (MBN), for the detection of non-homogeneous regions in carbon steel plates. It presents the advances in the development of a variant of a new non-destructive magnetic test technique, called Continuous Scanning Magnetic Barkhausen Noise (
Mat. Res.. Publicado em: 10/01/2019
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2. Damage evaluation and failure mechanism analysis of steel tube confined reinforced-concrete columns by acoustic emission technology
Abstract As a new kind of composite structures and its advantages, the using of steel tube confined reinforced concrete (STCRC) columns have received increasing attention in civil engineering. Acoustic emission (AE) technique is applied to monitor the damage process of STCRC columns during an uniaxial compression test. The aim of this study is to investigate
Lat. Am. j. solids struct.. Publicado em: 29/11/2018
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3. Influence of the osteosynthesis plate on ultrasound propagation in the bone
Objective: To analyze the influence of steel plates for osteosynthesis on the velocity of ultrasound propagation (VU) through the bone. Methods: The transverse coronal and sagittal velocity of ultrasound propagation underwater were measured on the intact bone and then on assemblies of the same bone with two types of osteosynthesis plates (DCP and semi
Acta ortop. bras.. Publicado em: 2014-10
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4. Periodic mechanical stress activates MEK1/2-ERK1/2 mitogenic signals in rat chondrocytes through Src and PLCγ1
The mitogenic effects of periodic mechanical stress on chondrocytes have been studied extensively but the mechanisms whereby chondrocytes sense and respond to periodic mechanical stress remain a matter of debate. We explored the signal transduction pathways of chondrocyte proliferation and matrix synthesis under periodic mechanical stress. In particular, we
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-12
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5. Compression of electromygraphic signals using adaptive predictive multi-rate codec / Compressão de sinais eletromiográficos usando codificador multitaxa preditivo adaptativo
The development of highly efficient speech codecs has raised the interest in their use in other types of signal, such as electrophysiological ones. This study evaluates the AMRACELP codec, developed for third generation mobile telephony, and proposes changes to improve its performance in compression of electromyographical signals, considering the objective q
Publicado em: 2009
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6. Impacto da utilização de tecnicas de lifting explorando diferença entre ferramentas interpretada e compilada na velocidade computacional da codificação wavelet de imagens estaticas / Impact of using lifting techniques to explore the differences between interpreted and compiled tools in the computational speed of wavelet static image coding
The field of analysis and compression of images has been received special attention of the scientific community because of including in the main systems of digital TV, satellite communications and mobile communications. In this context, the Discrete Transform Wavelet (TWD) arise how a powerful tool and its many advantages allowed your insertion in important
Publicado em: 2009
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7. Use of wavelets to improve the performance of numerical simulations using loads of clues in the automotive industry / Uso de wavelets para a melhoria de desempenho de simulações numéricas usando carregamentos de pistas na indústria automotiva
Wavelets são poderosas ferramentas matemáticas que, entre outras aplicações, visam melhorar a decomposição tempo-freqüência de sinais, avaliando-os em diferentes escalas, em uma abordagem multi-resolução que permite a analise dos diferentes aspectos da informação contida no respectivo sinal. Apesar de ser uma ferramenta relativamente nova, ela ve
Publicado em: 2009
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8. Detecção da condição de rubbing em maquinas rotativas atraves da transformada Wavelet / Detection of rubbing condition on rotating machinery by wavelet transform
This work presents a detection procedure of the rubbing phenomenon and its effects in rotating machinery, applicable on the stationary and non-stationary regimes, using the Wavelet Transform as analysis tool. Firstly, the Continuous Wavelet Transform (CWT) is applied for stationary signals using the Complex Morlet wavelet as mother wavelet, for extracting of
Publicado em: 2008
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9. Electromyografic signal compression exploring twodimensional correlation / Compressão de sinais de eletromiografia explorando correlação bidimensional
Nesta pesquisa é apresentada uma análise da correlação bidimensional de sinais eletromiográficos de superfície obtidos a partir de esforços isométricos e isotônicos. Para tanto, cada sinal foi segmentado em janelas contíguas e estas então concatenadas a fim de produzir uma matriz bidimensional. O tamanho dessas janelas foi variado para que se pude
Publicado em: 2008
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10. Food mechanics: a new device for testing fruits and vegetables
The new mechanical device developed is capable of performing compression tests but also bending, torsion and tensile tests. Its measurement system has the following components: a load cell (0 to 9800 N), a strain gauge signal conditioning board, a plug-in general purpose data acquisition board, and a displacement sensor (0 to 29.7 mm). These components are c
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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11. TRATAMENTO E COMPRESSÃO BASEADA EM WAVELETS PARA DADOS ADQUIRIDOS POR SENSORES / TREATMENT AND WAVELET-BASED COMPRESSION OF SENSOR DATA
This dissertation introduces a strategy to develop a compression method for sensor data inspired on the JPG2000 techniques. The strategy adopted processes data streams much in the same way as signal processing. Due to the unstable nature of sensor data, noise is added to the original signal. This noise is detected and treated while the signal is cleaned and
Publicado em: 2007
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12. Comparison of the discrete transform cosine and the discrete wavelet transform for image of compression of fingerprint / Comparação da transformada wavelet discreta e da transformada do cosseno, para compressão de imagens de impressão digital
This research aims to compare the following fingerprint image compression methods: the discrete cosseno transform (DCT), Haar wavelet transform, Daubechies wavelets transform and wavelet scalar quantization (WSQ). The main interest is to find out the technique with the smallest distortion and higher compression ratio. Image quality is measured using peak sig
Publicado em: 2007