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고합급백주철에 있어서 열처리가 기지조직의 변태에 미치는 영향
신상우,류성곤,Shin, Sang-Woo,Ryu, Seong-Gon 한국재료학회 2000 한국재료학회지 Vol.10 No.6
3%C-10%Cr-5%Mo-5%W, 3%C-10%V-5%Mo-5%W 및 3%C-17%Cr-3%V의 3종류 고합금백주철에 있어서 열처리후의 기지조직의 변태거동을 연구하였다. 15kg 용량의 고주파 유도용해로에 선철, 고철, Fe-Cr, Fe-V, Fe-Mo 및 Fe-W 등을 장입시켜 용해시킨 후 슬래그를 제거시키고 $1550^{\circ}C$에서 Y-block의 펩 주형에 주입시켰다. 적당한 크기로 절단한 시편을 진공분위기하에$950^{\circ}C$에서 5시간동안 우선 균질화처리를 실시하였다. 그 후 다시 이 시편을 $1050^{\circ}C$에서 2시간동안 오스테나이징시킨 후 강제공냉을 행하였다. 강제공냉된 시편을 $300^{\circ}C$에서 3시간 유지시킨 후 템퍼링을 실시하였다. 주방상태에서의 기지조직은 3합금 공히 퍼얼라이트이었으며 강제공냉후에는 마르텐사이트 및 오스테나이트로 변태하였다. 또한 기지조직내에 무수히 많은 이차탄화물 입자들의 석출되었다. 템프링 후 일부 오스테나이트 및 마르텐사이트는 템퍼드마르텐사이트로 변태하였다. 변태하였다. Three different white cast irons alloyed with Cr, V, Mo and W were prepared in order to study their transformation behavior of matrix structures in heat-treated conditions. The specimens were produced using a 15kg-capacity high frequency induction furnace. Melts were super-heated to $1600^{\circ}C$, and poured at $1550^{\circ}C$ into Y-block pepset molds. Three combinations of the alloying elements were selected so as to obtain the different types of carbides and matrix structures : 3%C-10%Cr-5%Mo-5%W(alloy No. 1), 3%C-10%V-5%Mo-5%W(alloy No. 2) and 3%C-17%Cr-3%V(alloy No. 3). The heat-treatments were conducted as follows: frist of all, as-cast specimens were homogenized at $950^{\circ}C$ for 5h under the vacuum atmosphere. Then, they were austenitized at $1050^{\circ}C$ for 2h and followed by air-hardening in air. The air-hardened specimens were tempered at $300^{\circ}C$ for 3h. The observation of morphology of the matrix structures was carried out in the states of as-cast(AS), air-hardened(AHF) and tempered(AHFT). The matrix structures of each alloy were almost fully pearlitic in the as-cast state but it was transformed to martensite, tempered martensite and retained austenite by the heat-treatments such as air-hardening and tempering.
차등 $3\omega$ 기법을 이용한 다층 유전체 박막의 열전도도 측정 및 검증
신상우,조한나,조형희,Shin, Sang-Woo,Cho, Han-Na,Cho, Hyung-Hee 정보저장시스템학회 2006 정보저장시스템학회논문집 Vol.2 No.1
In this study, measurement of thermal conductivity of multilayer thin dielectric film has been conducted via differential $3\omega$ method. Also, verification of differential $3\omega$ method has been accomplished with various proposed criteria. The target film for the measurement is 300 nm thick silicon dioxide which is covered with upper protective layer of various thicknesses. The upper protective layer is inserted between the target film and the heater line for purpose of electrical insulator or anti-oxidation barrier since the target film may be a good electrical conductor or a well-oxidizing material. Since the verification of differential $3\omega$ method has not been conducted yet, we have shown that the measurement of thermal conductivity of thin films with upper protective layer via differential $3\omega$ method is verified to be reliable as long as the proposed preconditions of the samples are satisfied. Experimental results show that the experimental errors tend to increase with aspect ratio between thickness of the upper protective layer and width of the heater line due to heat spreading effect.
〈학술논문 or 기술논문〉 DEM 방법을 통한 다성분 자성 입자의 거동해석
신상우(Sang woo Shin),서인수(In soo Seo),이상환(Sang hwan Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, Discrete Element Method was used to analyze the movement of several hundred charged particles in the magnetic field. Finite Element Method was used to measure the magnetic field. For size distribution of particle’s diameter, we distributed particles based on the Gaussian distribution by Monte Carlo Method. Chain formation is formed by magnetic charged particles by magnetic force. Then chain length was measured according to the different particle size distribution and magnitude of the magnetic field. In this result, multi size component particles simulation is a more realistic approach to the phenomenon than previous one size component particles simulation.
기술수용모델 기반 건축·도시 분야 융복합 교육의 수용의도에 관한 조사
신상우(Shin, Sang-Woo),김재준(Kim, Jae-Jun),여옥경(Yuh, Ok-Kyung) 대한건축학회 2015 대한건축학회논문집 Vol.31 No.12
The purpose of this study is to analyze the acceptance intention of education for effective convergence of education trainees using technical acceptance model(TAM) and Structural Equation Modeling Approach(SEM). The order of study was set research model and studies were conducted a study to verify that research model fit. Through previous research, Innovativeness of the respondents, subjective norms of the respondents, the perceived usefulness, perceived ease of use, and the convergence of education also accommodate five factors were derived and it was set according to the TAM seven hypotheses. This study was conducted a survey of the Cyber University Students. The survey was composed of five factors and twenty detail factors. A total of 244 parts of the survey results were derived through. The results of this study is as follows; Education subjective norm, level of Acceptance-intention, perceived ease of use, perceived usefulness are identified as affecting. As a result, the Architecture and Urban area convergence education it is important to show the orientation to be useful in a commercial environment. The result is indicating that the need to focus on any part of the Architecture and Urban area convergence educational opportunities.
신상우(Shin, Sang Woo) 한국증권법학회 2013 증권법연구 Vol.14 No.3
EU 및 FATF의 회원국인 독일은 2002년 자금세탁법(GwG)의 개정을 통해 법률 및 회계분야 전문직 종사자에게 일정한 의무를 부과했다. 이로 인해 전문직 종사자는 의심스러운 거래행위 또는 법에 저촉되는 자금세탁행위를 인지한 때에 고객의 신원을 확인해야 하고 직업단체에 신고해야 할 의무를 부담하게 되었다. 전문직 종사자의 이러한 의무는 불법거래행위를 사전에 예방할 수 있으며, 또한 수사기관에 정보를 제공함으로써 수사기관과의 공조를 향상시킬 수 있다. 우리나라 역시 FATF의 회원국으로서 자금세탁행위와 공중협박자금조달행위를 퇴치하고자 노력하고 있다. 그러나 독일의 자금세탁법과 비교해 볼 때, 우리나라의‘특정 금융거래정보의 보고 및 이용 등에 관한 법률’ 제2조 제1호에는 단지 “금융기관등”이라고만 규정되어 있어 독일 자금세탁법에 상응하는 전문직 종사자의 의무를 가지고 있지 않다. 따라서 독일과 같이 전문직 종사자의 의무를 특정 금융거래정보의 보고 및 이용 등에 관한 법률에 도입하여 자금세탁행위와 공중협박자금조달행위를 퇴치하고자 노력하여야 한다.