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Development and Evaluation of Raytracing Accelerating Engine with Bit Serial Arithmetic Units
Tomoyuki Kawamoto,Kazuya Tanigawa,Tetsuo Hironaka,Yuhki Yamabe 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In recent years, development of various rendering algorithm provide photorealistic image. However, requirement of quality for rendering causes significant increase of processing time. Raytracing method can generate high quality images.But, it needs much time to get images. Several methods of parallel computing for high speed processing for raytracing with hardware are discussed. But, the chip of conventional raytracing hardware needs huge area because of parallel arithmetic units on it , which result in difficulty on inserting more processing elements(PEs) into the chip. In this paper, we present hardware design of a raytracing accelerator engine with bit serial arithmetic unit to improve performance. Area of bit serial arithmetic unit is small, and operation performance per the unit area is high. We adopt a dot mode for parallel processing because it can make maximum use of the characteristic of bit serial(BS) arithmetic unit. As the first stage, we design prototype hardware which calculate only the process of highest load ratio in PE, and evaluate it. As a result, prototype hardware is about 5.09 times faster on processing time.
Namihira, Tomoyuki,Shinzato, Naoya,Akamine, Hikaru,Nakamura, Ichiro,Maekawa, Hideaki,Kawamoto, Yasuhiro,Matsui, Toru Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.3
To investigate the effect of nitrogen fertilization on the quality of tropical grass silage, guinea grass grown with 3 types of nitrogen fertilizers, namely, urea, ammonium sulfate, and compound fertilizer 804, at 2 fertilization levels, 0.5 and 2.5 kg $Na^{-1}$ (0.5 N and 2.5 N, respectively), was subjected to silage fermentation. Silage fertilized with 0.5 N showed butyrate-dominant fermentation, irrespective of the type of fertilizer used. On the other hand, fermentation of silage fertilized with 2.5 N was significantly affected by the type of fertilizer used; fertilization with ammonium sulfate and compound fertilizer 804 resulted in silage that contained a large amount of butyrate and no lactate; this silage was considered to be of a significantly low quality as compared with silage fertilized with 0.5 N. Among silage fertilized with 2.5 N, the desirable butyrate-free fermentation was found only in urea-fertilized silage, which had the best quality. Grass material fertilized with a high level of urea accumulated a relatively high concentration of nitrate nitrogen (0.22% dry matter). Our results presented here suggest that nitrogen fertilizer management could affect the quality of tropical grass silage and that a relatively high concentration of nitrate in silage may promote butyrate-free fermentation even in tropical grass silage.