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S. Y. Anaman,S. Ansah,M. G. Jo(조민구),J. Y. Suh(서진유),H. N. Han(한흥남),M. J. Kang(강민정),J. S. Lee(이종숙),S. T. Hong(홍성태),H. H. Cho(조훈휘) 한국소성가공학회 2021 한국소성가공학회 학술대회 논문집 Vol.2021 No.5
The electrochemical properties of a friction stir processed (FSPed) equiatomic CrMnFeCoNi high-entropy alloy (HEA) is investigated in an aerated 0.5 M Na<sub>2</sub>SO<sub>4</sub> electrolyte solution at room temperature. The microstructural analysis reveals a highly refined stir zone (SZ) with an average grain size that decreases from the top region of the SZ to the bottom region of the SZ (also known as shear processed zone; SPZ). However, the region below the SPZ, (i.e., below the plunge depth) experienced an increase in average grain size and dislocation densities compared to the other regions. There is no secondary phase observed in the FSPed region, however, the microstructural evolution in the FSPed region affects the electrochemical behavior of the HEA. Cr<sub>2</sub>O<sub>3</sub> passive layer is observed to form on the FSPed HEA leading to excellent corrosion properties from the polarization corrosion tests. Grain refinement in the SZ enhances the rapid formation of the passive layer, thus, leading to better corrosion properties in the front surface of the FSPed HEA. The localized corrosion behavior of the FSPed HEA is predicted to be caused by the micro-galvanic nature of the HEA, which leads to an increase in polarization at the anodic sites (pits). A numerical model is established using the corrosion parameters from the experiment to simulate the localized corrosion behavior on the surface of the FSPed HEA in a neutral environment. The predicted initial pitting potential and corresponding current density agree well with the experimental results. The model is also capable of tracking the dissolution of the pits over longer periods.
기상 환원제를 사용하는 선택적 환원촉매에서 유동혼합 개선에 관한 연구
고상철(S.C. Ko),이범호(B.H. Lee),조승환(S.H. Cho),이상헌(S.H. Lee),홍성태(S.T. Hong),이대엽(D.Y. Lee) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
Since emission regulations for vehicles have become more stringent, SCR technology has drawn a strong attention in order to reduce NOx emissions. Optimal design of a reductant injection nozzle and a multi-hole plate located between the cone and catalyst is critical in that the uniform distribution of reductant is necessary to maximize the NOx conversion efficiency and minimize the slip of reductant in SCR. In this work, an LPG fuel(C3H8 in vapor state) was used as a reductant for LPG vehicles. A Realizable k-ε model is used for turbulence, and SCR body is defined as porous media with inertia and viscous resistances measured in this work. Effect of the number of nozzle holes on the flow mixing index was analyzed, which revealed that a four hole nozzle shows the best performance in terms of uniformity of flow. An installment of a multi-hole plate at the entrance of catalyst was evaluated with flow mixing index, uniformity of flow, and pressure drop. A multi-hole plate with gradual hole diameter change in three steps showed the best uniformity of flow within the conditions suggested in this work.
정선태(S. T. Cheoung),유철중(C. J. Yoo),장옥배(O. B. Chang),홍성태(S. T. Hong),정병열(B. Y. Chung) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B
오늘날 사회는 더욱 고도화 · 다양화되어 불의의 재난으로 인하여 시민의 생명과 재산이 위협받는 경우가 빈번히 발생하게 되었다. 복잡하고 다양화된 재난에 신속히 대응하고 구조 · 구급 등 소방 관련업무 수요에 능동적으로 대처하여 시민에게 양질의 봉사행정 서비스를 제공하기 위해서는 국내 실정에 맞는 지리정보시스템을 활용한 소방응급지령시스템이 절실히 요구되고 있다. 본 논문에서는 우리의 생활과 밀접한 지역정보, 도시정보 및 각종 기반 시설물 정보를 공간정보 데이터베이스로 구축하여 이를 이용한 소방응급지령시스템을 개발하였다. 소방행정 및 지령업무 전산화를 통한 고도 정보산업사회의 재난관리 기능을 강화함으로써 국민생활 안정과 복지향상을 도모하고, 아울러 본 소방응급지령시스템을 기본 모델로 제시하여 향수 국내 모든 지역의 소방업무에 이 시스템을 확산하는데 그 목적이 있다.