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Different seismic data compression algorithms have been developed in order to make the storage more efficient, and to reduce both the transmission time and cost. In general, those algorithms have three stages: transformation , quantization and coding. The Wavelet transform is highly used to compress seismic data, due to the capabilities of the Wavelets on(More)
A seismic survey can produce a vast amount of data which is on the order of hundreds of terabytes. A high performance seismic data decompression algorithm can solve problems related not only to storage and transmission but also bandwidth. Decoding is one of the most expensive computational process in seismic data decompression due to the use of enthropy(More)
To examine the influence of sleep state, respiratory pattern, and ventilation on cyclical fluctuations (CF) in cerebral blood flow (CBF) velocity (CBFV), we studied 21 'healthy' preterm infants: birth weight 1,790 +/- 162 g (SEM), study weight 1,960 +/- 165 g, gestational age 32 +/- 1 weeks, postnatal age 20 +/- 4 (range 8-57) days. The CBFV was measured(More)
We aim to use a data compression strategy to improve the seismic data transfer between CPU and FPGA through the PCIe bus. In order to improve the transfer speed, it is necessary that the compressed data transfer time (t<sub>1</sub>) plus the decompression time (t<sub>2</sub>) has to be less than the traditional transfer time (t<sub>t</sub>), that is(More)
Huffman coding algorithm is widely used for seismic data compression because it offers good performance in terms of compression ratio. The algorithm compresses the data by assigning shorter code-words to the most frequent symbols, while the other symbols have longer code-words. It is difficult to accelerate the decoding process by exploiting the parallel(More)
The Discrete Wavelet Transform (DWT) is an important technique for signal analysis, compressing and denoising due to its excellent locality in the time-frequency domain. The DWT is developed by convolutions which demand both a large number of mathematical operations and a large amount of storage. The lifting scheme reduces both computational and storage(More)
Resumen Existen influyentes corrientes del pensamiento bioé-tico contemporáneo que pretenden justificar por di-versos motivos la práctica de feticidios, abortos se-lectivos, " reducciones fetales " , y " terminaciones del embarazo ". Generalmente acuden a razonamientos relacionados con la " autonomía de la madre " y a la Critical notes about some(More)
Subsurface images are widely used by the oil companies to find oil reservoirs. The construction of these images involves to collect and process a huge amount of seismic data. Generally, the oil companies use compression algorithms to reduce the storage and transmission costs. Currently, the compression process is developed on-site using CPU architectures,(More)
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