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Pin 순서를 고려한 Global Router 개발에 관한 연구
이병호(B. H. Lee),정정화(J. H. Jung),임인칠(I. C. Lim) 한국정보과학회 1984 한국정보과학회 학술발표논문집 Vol.11 No.2
본 논문에서는 LSI/VLSI layout CAD에 있어서의 Global routing에 관하여 논하였다. 종래의 Global router에서는 pin의 위치를 cell의 중앙에 두었기 때문에 신호선의 channel 사용량을 정확히 산출할 수 없었다. 그 결과 배선량 overflow가 발생하여 100% 결선율을 저해하는 등 많은 문제점이 있었다. 본 연구에서는 이러한 문제점을 모두 보완할 수 있는 pin 순서를 고려한 새로운 방법의 Global routing 알고리즘을 제안하였다. 이 알고리즘을 사용하여 Global router를 개발하고 program의 실험 결과를 통하여 제안한 알고리즘의 유용성을 보였다.
이병호(B.H.Lee),이상준(S.J.Lee),김태권(T.K.Kim),최경호(G.H.Choi) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The purpose of this study was to investigate about the effect of EGR and with fuel additive on diesel emissions. EGR rate was defined with the volume of fresh change and the estimated volume of recirculated gas with assumption of constant volumetric efficiency. The major conclusion of this work include; ( i ) the amount of NOX concentration is decreased about 88% with the 40% of EGR rate, and the amount of smoke density is increased three times respectively; (ii) adding the 30 ppm of iron additive to the diesel fuel, the smoke density is decreased about 60%; (iii) below the 50% of engine load with the 40% of EGR rate, the amount of oxygen is decreased 27%, and the heat capacity is increased 42%, respectively; (iv) finally, the reason of NOX decrease by EGR seems to be that it is influenced by the increase of heat capacity because of excess air under the low load condition and by the amount of oxygen because of rich condition with the high load.<br/>
CNC를 적용한 자동차 EGR 냉각기의 냉각성능에 관한 연구
이병호(B. H. Lee),김보한(B. H. Kim),김영진(Y. J. Kim),이윤환(H. U. Lee),정한식(H. S. Chung) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
Although combustion is essential in most energy generation processes, it is one 01 the major causes of air pollution. Circle fin exhaust pipes were designed to study the effect of cooling the recirculated exhaust gases (EGR) of Diesel engines on the chemical composition of the exhaust gases and the reduction in the percentages of pollutant emissions. The gases examined in this study were oxides of nitrogen (NOx), carbon dioxide (CO<sub>2</sub>) and carbon monoxide (CO). In addition, O<sub>2</sub> concentration in the exhaust was measured. The designs adopted in this study were exhaust pipes with solid and hollow fins around them direct surface force measurement in water using a nanosize colloidal probe Technique The direct force measurement between colloidal surfaces has been an essential topic in both theories and applications of surface chemistry. As particle size is decreased from micron size down to true Carbon nano Colloid size (<10 nm), surface forces are increasingly important. Nanoparticles at close proximity or high solids loading arc expected to show a different behavior than what can be estimated from continuum and mean field theories. The current tools for directly measuring interaction forces such as a surface force apparatus or atomic force microscopy (AFM) are limited to particles much larger than nanosize. Here a modified colloidal probe technique is suggested using a multiwalled. This paper use Water and CNC fluid at normal cooling system of EGR. Experimental result showed all good agreement at Re=2.54×10<sup>2</sup>.