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포스터 전시회 : 서보 유압형 피에조 인젝터 모델 개발 및 2단 분사 검증
김상명 ( Sang Myeong Kim ),정명철 ( Myoung Chul Jeong ),성기수 ( Gi Su Sung ),조인수 ( In Su Jo ),이진욱 ( Jin Wook Lee ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
Performance of diesel engine with high fuel pressure injection is related its emission gas and fuel consumption. In this study, by using 3rd generation piezo-driven injector model, two-stage injection characteristics and effects were analyzed. And numerical model with injection rate and hydraulic pressure about two-stage injection were developed and verified with experimental results.
김상명(Kim Sang Myoung),박주원(Park Ju Won),이훈하(Lee Hoon Ha),김기호(Kim Ki Ho) 대한토목학회 2008 대한토목학회논문집 A Vol.28 No.3A
Hydration reaction of Free-CaO is thought to be the main reason of expansion failure of slag. A lot of research institutions are conducting studies on solutions to this problem, and moreover it has been carried out how to make use of aggregates for concrete. While studies covering wide rage of blast furnace slag have been accomplished in the country, studies on steelmaking slag are insufficient. Therefore, this study aimed at analyzing basic physical properties of electric arc furnace oxidizing slag, which is the main material, and furthermore it focused on how to make use of aggregates for concrete examining chemical mechanism, which can be put to practical use. To address this issue, components of electric arc furnace oxidizing slag were analyzed with measurement of physical properties, followed by long-term strength and detailed durability analysis, which can evaluate the appropriateness of application of cement concrete. Besides the environmental conservation and recycling which can be obtained by application of industry byproducts, commercializing of electric arc furnace oxidizing slag as fine aggregates for cement concrete are expected. 슬래그의 팽창성 붕괴는 주로 Free-CaO의 수화 반응이 주된 원인으로 분석되고 있으며, 이 문제의 해결 방안을 마련하기 위해 여러 기관에서 연구가 진행되고 있고, 더불어 콘크리트용 골재로의 활용 방안을 지속적으로 연구하고 있다. 현재, 국내에서는 고로 슬래그에 대한 연구는 많이 이루어지고 있지만, 전기로 및 전로 슬래그와 같은 제강 슬래그에 대한 연구는 극히 미비한 실정이다. 이에, 본 연구의 주재료인 전기로 산화 슬래그의 기초적인 물성 분석뿐만 아니라, 화학적인 메커니즘을 규명하여 콘크리트용 잔골재로서의 활용 가능성을 분석하고, 실생활에 응용하는데 그 목적이 있다고 하겠다. 그렇기 때문에, 본 연구의 진행 방향으로 전기로 산화 슬래그의 성분 분석과 함께 기본 물성을 측정하고, 이후에 중/장기 강도 및 세부적인 내구성 분석을 실시하여, 시멘트 콘크리트 적용의 적합성 평가 후, 규격을 제안하는 절차를 밟았다. 본 연구에 대한 기대 효과는 산업 부산물의 활용에 따른 환경 보전 및 재활용이라는 측면 이외에도, 전기로 산화 슬래그의 시멘트 콘크리트용 잔골재서의 상용화에 있다고 하겠다.
황화수소 피독이 고분자전해질 막 연료전지의 성능에 미치는 영향
이수 ( Soo Lee ),진석환 ( Seok Hwan Jin ),김상명 ( Sang Myoung Kim ) 한국유화학회 2011 한국응용과학기술학회지 Vol.28 No.1
Polymer electrolyte membrane fuel cell (PEMFC) performance degrades when hydrogen sulfide (H2S) is present in the fuel hydrogen gas; this is referred to as H2S poisoning. This paper reveals H2S poisoning on PEMFC by measuring electrical performance of single cell FC under various operating conditions. The severity of H2S poisoning depended on H2S concentration under best operating conditions(65˚C of cell temperature and 100% of anode humidification). H2S adsorption occured on the surface of catalyst layer on MEA, but not on the gas diffusion layer(GDL) by analyzing SEM/EDX data. In addition, MEA poisoning by H2S was cumulative but reversible. After poisoning for less than 150 min, performance of PEMFC was recovered up to 80% by just inert nitrogen gas purging.
김익희(Kim Ick Hee),이상명(Lee Sang-Myoung),윤경만(Yoon Kyoung Man) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Since 2010 December the Gyeongchun line can provide better service than the other modes in respect of cost & time efficiency by operating electric double track from Sangbong station to Chuncheon station. However customers living in the Northern part of capital area which there are stations of line No.1 have inconvenience to transfering twice to access Gyeongchun line. To minimize inconvenience this study has analyzed the demand variation of Geongchun line upon changing the terminal of some trains on Gyeongchun line which reduces the number of transfer. In this study the demand variation has been estimated by the direct demand model considering only saving time between O/D. So some additional modifications are required because the effect of fare and accession convenience has not been considered.