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장성철(Seongcheol Jang),황희융(Heeyeung Hwang) 한국정보과학회 1993 한국정보과학회 학술발표논문집 Vol.20 No.1
윈도우즈 NT(Windows New Technology)는 개인용 컴퓨터뿐만 아니라 미니 컴퓨터에서도 사용될 수 있는 차세대 운영체제이다. 이러한 윈도우즈 NT를 기반으로 하는 국내의 응용 소프트웨어 개발을 위해서는 한글 입출력 문제가 해결되어야 한다. 본 논문에서는 이를 위하여 원래의 문자 출력 함수의 주소를 수정하는 한글 출력 기법과 메시지 훅(message hook)을 이용한 한글 입력 기법을 처음으로 제안한다. 이러한 기법은 윈도우즈 NT 응용 소프트웨어 개발에 상당한 영향을 끼칠 수 있다.
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Effect of operating temperature using Ni-Al-ZrH<sub>2</sub> anode in molten carbonate fuel cell
서동호(Seo, Dongho),장성철(Jang, Seongcheol),윤성필(Yoon, Sungpil),남석우(Nam, Suk Woo),오인환(Oh, In-Hwan),임태훈(Lim, Tae-Hoon),홍성안(Hong, Seong-Ahn),한종희(Han, Jonghee) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Fuel cell is a device that directly converts chemical energy in the form of a fuel into electrical energy by way of an electrochemical reaction. In the anode for a high temperature fuel cell, nickel or nickel alloy has been used in consideration of the cost, oxidation catalystic ability of hydrogen which is used as fuel, electron conductivity, and high temperature stability in reducing atmosphere. Most MCFC stacks currently operate at an average temperature of 650?C. There is some gains with decreased temperature in MCFC to diminish the electrolyte loss from evaporation and the material corrosion, which could improve the MCFC life. However, operating temperature has a strong related on a number of electrode reaction rates and ohmic losses. Baker et al. reported the effect of temperature (575 to 650?C). The rates of cell voltage loss were 1.4mV/?C for a reduction in temperature from 650 to 600?C, and 2.16mV/?C for a decrease from 600 to 575?C. The two major contributors responsible for the change in cell voltage with reducing operation temperature are the ohmic polarization and electrode polarization. It appears that in the temperature range of 550 to 650?C, about 1/3 of the total change in cell voltage with decreasing temperature is due to an increase in ohmic polarization, and the electrode polarization at the anode and cathode. In addition, the oxidation reaction of hydrogen on an ordinary nickel alloy anode in MCFC is generally considered to take place in the three phase zone, but anyway the area contributing to this reaction is limited. Therefore, in order to maintain a high performance of the fuel cell, it is necessary to keep this reaction responsible area as wide as possible, that is, it is needed to keep the porosity and specific surface area of the anode at a high level. In this study effective anodes are prepared for low temperature MCFC capable of enhancing the cell performance by using zirconium hydride at least in part of anode material.
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Base-Isolated NPP의 Interface 배관계통에 대한 내진해석방법 연구
김대수(Daesoo Kim),이효승(Hyoseung Lee),류동원(Dongwon Lyu),김수겸(Sookyum Kim),장성철(Seongcheol Jang) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
A study of the application of seismic isolation system have been widely researched in order to increase the safety of seismic analysis for nuclear power plant(NPP). In the design of base isolated NPPs, the seismic analysis of interface piping system multi-supported between base-isolated and fixed building is one of the key issues. For the seismic design of interface piping system, it is needed not only rigidity to withstand the force of the inertia response generated by excitations from base-isolated and fixed building but also flexibility to cope with the large relative displacements between two buildings. In order to meet seismic requirements of interface piping system, this paper utilized two methods to perform the seismic analysis of MS interface piping system. First, in order to satisfy the rigidity requirement of MS interface piping system, this paper adapts Multiple Input Response Spectrum (MIRS) method together with the SRSS combination between support groups, USNRC Regulatory Guide 1.61 damping as seismic analysis method to consider different vibration characteristics of base-isolated and fixed building. Second, in order to secure the flexibility of MS interface piping system, this paper use the method to adjust the stiffness of pipe supports installed on MS interface piping system, and performs the sensitivity study on the stiffness of pipe support to find the optimal stiffness that can distribute the excessive piping stress and support loads occurred in the local portion of MS interface piping system.
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