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오늘 본 자료
Lee, Byeonghun,Lee, Saebom,Kim, Hyeonsoo,Jeong, Kijun,Park, Jinbyung,Lee, Eunyeol,Lee, Jinwon Kluwer Academic Publishers 2015 Biotechnology letters Vol.37 No.5
<P>To produce 10-ketostearic acid from oleic acid.</P>
Advanced Interactive Preintegrated Volume Rendering with a Power Series
Byeonghun Lee,Yeong-Gil Shin IEEE 2013 IEEE transactions on visualization and computer gr Vol.19 No.8
<P>Preintegrated volume rendering produces high-quality renderings without increased sampling rates. However, a look-up table of a conventional preintegrated volume rendering requires a dimensionality of two, which disturbs interactive renderings when the transfer function is changed. Furthermore, as the resolution of the volume data set increases, the memory space required is impractical or inefficient, especially on GPUs. In the past, several approximation methods have been proposed to reduce the complexity of both the time and memory requirement, but most of them do not correctly present thin opaque structures within slabs and ignore the self-attenuation. We propose an advanced interactive preintegrated volume rendering algorithm that achieves not only high-quality renderings comparable to the conventional ones, but also O(n) time and memory space requirements even with the self-attenuation within the slabs applied. The algorithm proposed in this paper decomposes the exponential term of the ray integration equation into a power series of a finite order in the form of a linear combination to build a one-dimensional look-up table. Moreover, the proposed algorithm effectively applies the self-attenuation that is caused by fully opaque isosurfaces, by introducing an opaque prediction table. Experimental results demonstrate that the proposed algorithm offers renderings visibly identical to existing preintegrated volume renderings without degrading rendering speed.</P>
배기가스 재순환 방식이 예혼합 연소시스템에 미치는 영향
유병훈(Byeonghun Yu),이승로(Seungro Lee),금성민(Sung-Min Kum),이창언(Chang-Eon Lee) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.- No.46
The premixed combustion system applying exhaust gas recirculation was investigated to achieve the low pollutant emission and the high thermal efficiency. In this study, it was studied the effects of EGR on the thermal efficiency, NOx and CO emissions with various EGR ratios and equivalence ratios. As results, when equivalence ratio was increased, thermal efficiency increased and NOx and CO concentration increased. When EGR was applied, NOx and CO concentration decreased and thermal efficiency increased. Especially, in the case of 15% of EGR ratio at 0.85 of equivalence ratio, NOx and CO concentration will be a smaller than these of a current operating condition of the boiler and thermal efficiency was about 1.7% higher.
유병훈(Byeonghun Yu),김종민(Jong-Min Kim),이승로(Seungro Lee),금성민(Sung-Min Kum),이창언(Chang-Eon Lee),손승길(Seung-Kil Son) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
In this study, the effect of exhaust gas recirculation on NOx and CO emissions and flame behaviors on the burner surface were experimentally investigated by various equivalence ratio using a condensing boiler as typical household premixed combustion device. As results, the NOx and CO emissions increased as the equivalence ratio and boiler capacity increased without exhaust gas recirculation. However, NOx and CO emissions decreased, when the rate of exhaust gas recirculation increased, Also if equivalence ratio was increased to improve the efficiency of boiler, the part of the metal fiber burner surface changed in red. In addition, when the rate of exhaust gas recirculation increased, the part of the metal fiber burner surface was almost unchanged.