Browsing by Author "Chen, Jia-Wei"

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A Two level Mode Decision Algorithm for H.264 High Profile Intra Encoding
(2012)
Chang, Cheng-Yen
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Chien, Cheng-An
;
Chang, Hsiu-Cheng
;
Chen, Jia-Wei
;
Guo, Jiun-In
A two level mode decision algorithm considering edge information for H.264 high profile intra encoding is proposed to reduce the computational complexity. In level one mode decision, the edge information is used to decide the appropriate intra coding block size according to the observations that a smooth macroblock usually chooses the large intra coding block size, and that a complex macroblock usually chooses the small one. In level two mode decision, we use the correlation between adjacent blocks to decide the appropriate prediction modes. The propose method achieves 34%similar to 59% reduction of computational complexity when compared to JM14 and the PSNR only drops 0.09 db in averag.
BGA cutter improvement utilizing nano-TiAlN coating layers synthesized by cathodic arc ion plating process
(2009-12-25)
Huang, Sung-Hsiu
;
Hsieh, Tsung-Eong
;
Chen, Jia-Wei
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材料科學與工程學系
;
Department of Materials Science and Engineering
Ti/Al targets with various concentration ratios, Ti(0.75)Al(0.25), Ti(0.66)Al(0.33), Ti(0.5)Al(0.5) and Ti(0.33)Al(0.66) were used in a filtered cathodic arc ion plating system (FCAIP) to deposit the multilayer TiAlN films on Si wafer substrates and WC cermet ball grid array (BGA) cutters at various modulation wavelengths. Transmission electron microscopy (TEM), nanoindentation and BGA router were used to evaluate the characteristics of TiAlN layers and the performance of BGA cutters. TEM analysis revealed that the modulation wavelengths of deposited layers are less than 10 nm at various rotation speeds in FCAIP chamber and the crystal structure of TiAlN layer with the maximum hardness is NaCl-B1 structure using the Ti(0.5)Al(0.5) target The maximum hardness of multiple TiAlN layers measured by nanoindentation was 43 GPa,while the TiAlN monolayer exhibited the maximum hardness of 30 GPa in the same chamber. The TiAlN-coated BGA cutter deposited at the optimized condition exhibited a twice longer life and a higher machining speed in comparison with the conventional cutter. (C) 2009 Elsevier B.V. All rights reserved.