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Browsing by Issue Date, starting with "2014-09-20"

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    Development of parallel direct simulation Monte Carlo method using a cut-cell Cartesian grid on a single graphics processor
    (2014-09-20)
    Lo, M. -C.
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    Su, C. -C.
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    Wu, J-S
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    Kuo, F. -A.
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    機械工程學系
    This study developed a parallel two-dimensional direct simulation Monte Carlo (DSMC) method using a cut-cell Cartesian grid for treating geometrically complex objects using a single graphics processing unit (GPU). Transient adaptive sub-cell (TAS) and variable time-step (VTS) approaches were implemented to reduce computation time without a loss in accuracy. The proposed method was validated using two benchmarks: 2D hypersonic flow of nitrogen over a ramp and 2D hypersonic flow of argon around a cylinder using various free-stream Knudsen numbers. We also detailed the influence of TAS and VTS on computational accuracy and efficiency. Our results demonstrate the efficacy of using TAS in combination with VTS in reducing computation times by more than 10x. Compared to the throughput of a single core Intel CPU, the proposed approach using a single GPU enables a 13-35x increase in speed, which varies according to the size of the problem and type of GPU used in the simulation. Finally, the transition from regular reflection to Mach reflection for supersonic flow through a channel was simulated to demonstrate the efficacy of the proposed approach in reproducing flow fields in challenging problems. (C) 2014 Elsevier Ltd. All rights reserved.
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    Speckle reduction by combination of digital filter and optical suppression in a modified Gerchberg-Saxton algorithm computer-generated hologram
    (2014-09-20)
    Chen, Chien-Yue
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    Deng, Qing-Long
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    Wu, Pei-Jung
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    Lin, Bor-Shyh
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    Chang, Hsuan T.
    A speckleless illuminated modified-Gerchberg-Saxton-algorithm-type computer-generated hologram, which adopts a lower frequency of the iterative algorithm and calculation time, is proposed to code a hologram with two signals and position a multiplexing phase-only function, which can reconstruct the left and the right viewing holograms on the pupillary-distance position after the decryption and still maintain the content with high contrast and definition. The reconstructed image quality presents root mean square error of 0.03, with a diffraction efficiency of 87%, and signal-to-noise ratio of 8 dB after the analysis. Furthermore, two denoising techniques for the digital filter and optical suppression are combined, in which the speckle suppression with pseudorandom phase modulation and a rotating diffuser are utilized for successfully reducing the speckle contrast, which was reduced to below 4%. The goal was to reduce visual fatigue for the viewers. (C) 2014 Optical Society of America
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    新手上路
    (2014-09-21)
    黃苡齊
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    Department of Communication and Technology
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    傳播與科技學系
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    亦敵亦友 喀報大魔王
    (2014-09-21)
    張婷芳
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    Department of Communication and Technology
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    傳播與科技學系
    關於面對喀報種種的心情點滴
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    新手上路
    (2014-09-21)
    張凱翔
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    Department of Communication and Technology
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    傳播與科技學系
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    Hola! yo soy Clara 喀報新手上路請多指教
    (2014-09-21)
    陳怡均
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    Department of Communication and Technology
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    傳播與科技學系
    一段莫名的自我介紹、一些對喀報緊張的心情，還有一則湊字數的笑話。
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    新手上路
    (2014-09-21)
    許翔
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    Department of Communication and Technology
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    傳播與科技學系
    新手上路，對於喀報及多多系統等等的心得感想與疑問。
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    新手上路 how about my vacation
    (2014-09-21)
    顏晟宇
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    Department of Communication and Technology
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    傳播與科技學系
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    喀報　甜蜜的負擔
    (2014-09-21)
    陳珮容
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    Department of Communication and Technology
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    傳播與科技學系
    面對喀報，真的是既期待又怕受傷害。但幸運的是，我們可以自由選擇自己有興趣的主題，透過採訪、觀察完成文章及報導；我很期待自己能夠脫離舒適圈，用勇敢的態度面對喀報。
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    新手上路
    (2014-09-21)
    杜以翔
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    Department of Communication and Technology
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    傳播與科技學系
    杜以翔的新手上路
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    新手上路
    (2014-09-21)
    查爾灣.米吉
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    Department of Communication and Technology
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    傳播與科技學系
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    新手上路
    (2014-09-21)
    賴奕安
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    Department of Communication and Technology
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    傳播與科技學系
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    光州‧ 美麗‧ 日記
    (2014-09-21)
    黃美恩
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    Department of Communication and Technology
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    傳播與科技學系
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    新手上路
    (2014-09-21)
    洪詩宸
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    Department of Communication and Technology
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    傳播與科技學系
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    駛前大革命 爆爆龍來襲
    (2014-09-21)
    劉敏慈
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    Department of Communication and Technology
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    傳播與科技學系
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    喀報小新手
    (2014-09-21)
    郭穎慈
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    Department of Communication and Technology
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    傳播與科技學系
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    新手上路
    (2014-09-21)
    李怡安
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    Department of Communication and Technology
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    傳播與科技學系
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    新學期、接觸喀報的第一次
    (2014-09-21)
    沈祖廷
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    Department of Communication and Technology
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    傳播與科技學系
    暑假流浪也夠了，終於回到傳科系正軌上。風聞許久的喀報，試試水溫，就要開始精彩的一年。
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    新手上路
    (2014-09-21)
    謝宜寧
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    Department of Communication and Technology
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    傳播與科技學系
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    新手上路 與喀報同進退
    (2014-09-21)
    陳致穎
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    Department of Communication and Technology
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    傳播與科技學系