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Vector quantization (VQ) is a lossy compression technique that mainly includes three stages: codebook generation, encoding and decoding. The efficiency of VQ extremely depends on the achieved codebook quality. The most commonly used method for VQ codebook generation, is the Linde-Buzo-Gray (LBG) algorithm. High sensitivity to initial codebook, is mentioned as one of the drawbacks of LBG algorithm...
Porosity formation in aluminium alloys is strongly dependent on melt cleanliness (oxide level) and its hydrogen content. Porosity phenomenon in aluminium alloys is extremely important in case of critically stressed components such as in aerospace applications. In order to investigate the effect of varying oxide levels (by the addition of anodized plates and oxide rods), series of reproducible castings...
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