http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Urea-SCR 시스템의 유동혼합 개선을 위한 혼합기 형상에 관한 수치적 연구
이종욱(J.W. Lee),최훈기(H.K. Choi),유근종(G.J. Yoo),김원석(W.S. Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
To alleviate NOx emission, a variety of approaches has been applied. In marine diesels, the application of SCR systems has been considered an effective exhaust aftertreatment method for NOx emission control. Most current SCR systems use a various catalyst for the reaction of ammonia with NOx to form nitrogen and water. In theory, it is possible to achieve 100% NOx if the NH3-to-NOx ratio is 1:1. However, the reaction has a limited non-uniformity of the exhaust gas flow and ammonia concentration distribution. Therefore, it is necessary to investigate the optimum flow conditions. In order to achieve uniform flow at monolith front face, we are equipped with a various mixed device. In this paper, it is presented that the mixed devices play an important role improvement of flow patterns and particle distributions of NH3 by numerical simulation.
발전기용 18Cr-18Mn-N 오스테나이트계 스테인리스강의 기계적 특성에 미치는 냉간가공과 응력완화 처리의 영향
황병철(B. Hwang),배종인(J-I. Bae),하헌영(H-Y. Ha),이태호(T-H. Lee),신종호(J-H. Shin),이종욱(J-W. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
High-nitrogen 18Cr-18Mn austenitic steels have been recently developed and used for generator retaining rings which require to have non-magnetic, high strength, high ductility and good corrosion resistance. The ring materials shall be expanded by an appropriate method such as segmented dies, tapered plug and etc. in the temperature range 15 to 200℃, and stress-relief annealed at around 400℃ to achieve the required mechanical properties. This study is concerned with the effect of cold working and stress relief treatment on the mechanical properties of high-nitrogen 18Cr-18Mn austenitic steel with different N content. Although the yield and tensile strength usually increased with N content and cold working ratio, an increase in strength by cold working was dependent on the N content. The strengths also increased after stress relief treatment, which was affected by the amount of cold working. On the other hand, the ductility and impact toughness steadily decreased with cold working ratio, irrespective ofN content and stress relief treatment.
이명열(M. R. Lee),이종욱(J. W. Lee),김영득(Y. D. Kim),신종호(J. H. Shin) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The purposes of this study investigate effect of forging and hot and cold rolling on mechanical properties in austenitic high nitrogen steel(HNS) containing Cu and Ni. The 100㎏ HNS ingots manufactured by Pressurized Vacuum Induction Melting(PVIM) were forged and followed hot and cold rolling. Peak stress(σp) decreased with strain increase. Tensile and yield stress strength were decreased with addition of Cu and Ni, while enlongation was increased slightly. There was no difference in nitrogen contents with addition of Cu and Ni.
설계인자 변경에 따른 버터플라이 밸브 유동 특성에 관한 연구
이종욱(J.W. Lee),최훈기(H.K. Choi),유근종(G.J. Yoo) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
Flow control butterfly valve(FCBV) is known to have difficulty in controlling flow rate along valve opening due to its high flow rate. In low opening condition, the butterfly valve also has some shortcomings such as noise, vibration and erosion which are mostly caused by cavitation effects. Therefore, the FCBV requires proper remedies to reduce cavitation effects and to improve .flow control performance. Numerical analysis is applied to FCBV flow to find effects of design factors such as seat diameter and valve opening rate. Cases with 3 different sizes of seat diameter and various valve opening rate are selected for the numerical analysis. From the analysis results, it is found that the FCBV with small seat diameter shows better pressure loss performance and reduced cavitation effects.
이종욱(J W Lee),임종석(C S Rim) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2
본 논문에서는 3층 채널 배선(Three Layer Channel Routing)에서 via 최소화 문제(Via Minimization Problem)를 층 재배정(Layer Re-assignment)과 via shifting 방법을 이용하여 해결하는 휴리스틱 알고리즘을 제안하였다. 제안된 알고리즘은 via의 제거를 위하여 라인 세그먼트들이 배정된 층을 적당한 층으로 재배정하는 순환 프로시쥬어를 사용하며, 라인 세그먼트 상에서 via의 위치를 이동시켜, 전체 via의 수를 더욱 감소시킨다. 본 논문에서 제안한 알고리즘을 C언어로 구현, 수행시킨 결과, 기존에 제시되었던 방법에 비해 더 많은 via의 감소를 얻을 수 있었다.