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장성철(Seong-Cheol Jang),배동호(Dong-Ho Bae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Even though nuclear power showed remarkable increase as an industrial energy source, recently, its demand has been slowed down by conservatism of nuclear power industry and market stagnation. Therefore, many researchers have so far investigated on improving and developing technologies to maximize the economical efficiency as well as safety maintenance of nuclear power plant using the destructive and nondestructive approaches. In particular, evaluation of mechanical characteristics of materials by aging degradation due to corrosion, creep, and fatigue is actively investigated. In this paper, as a fundamental study to evaluate fracture characteristics and material degradation by corrosion, evaluated electrochemical corrosion and corrosion fatigue characteristics of CF8A steel using as a material of the piping system in nuclear power plant. CF8A steel was artificially aged at 400℃ for 3 months. The environmental test condition is 3.5wt.% NaCl solution of room temperature.
장성철(Seong-Cheol Jang),배동호(Dong-Ho Bae) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Even though nuclear power showed remarkable increase as an industrial energy source, recently, its demand has been slowed down by conservatism of nuclear power industry and market stagnation. Therefore, many researchers have so far investigated on improving and developing technologies to maximize the economical efficiency as well as safety maintenance of nuclear power plant using the destructive and nondestructive approaches. In particular, evaluation of mechanical characteristics of materials by aging degradation due to corrosion, creep, and fatigue is actively investigated. In this paper, as a basic study to evaluate fracture characteristics and material degradation by corrosion, evaluated electrochemical corrosion and corrosion fatigue characteristics of CF8A using as a material of the piping system in nuclear power plant. And, by using the DCPD method as a nondestructive damage and fracture life prediction approach, evaluated its possibility and reliability.
Zeolite 5A에서의 H<sub>2</sub>/CO/CO<sub>2</sub> 단성분 및 혼합성분의 흡착평형
안의섭,장성철,최도영,김성현,최대기,Ahn, Eui-Sub,Jang, Seong-Cheol,Choi, Do-Young,Kim, Sung-Hyun,Choi, Dae-Ki 한국화학공학회 2006 Korean Chemical Engineering Research(HWAHAK KONGHA Vol. No.
Zeolite 5A 촉매에서 $H_2$, CO, $CO_2$에 대한 단성분 및 혼합성분의 흡착평형 실험을 정적부피법에 의해 수행하였다. 실험 데이타는 온도범위 293.15 K, 303.15 K, 313.15 K이고, 압력범위는 25 atm까지로 하여 얻었다. 각각의 파라미터들은 단성분 실험을 통해 얻었고, 이를 통해 혼합성분의 흡착 평형을 예측하였으며 실험값과 비교하였다. Zeolite 5A 에서의 $H_2/CO_2$, $CO/CO_2$ 혼합가스의 흡착평형 실험 결과는 Langmuir isotherm, Langmuir-Freundlich isotherm and Dual-Site Langmuir isotherm을 이용해 예측하였다. 그 결과 Dual-Site Langmuir isotherm모델이 가장 유사한 예측을 하는 것으로 나타났다. Adsorption experiments for $H_2$, $CO_2$, CO, and their binary mixtures on zeolite 5A were performed by static volumetric method. Experimental data were obtained at temperatures of 293.15, 303.15 and 313.15 K and at pressures to 25 atm. The parameters obtained from single component adsorption isotherm. Multicomponent adsorption equilibria could be predicted and compared with experimental data. Langmuir isotherm, Langmuir-Freundlich isotherm and Dual-Site Langmuir isotherm be used to predict the experimental results for binary adsorption equilibria of $CO_2/CO$ and $H_2/CO_2$ on zeolite 5A. Dual-Site Langmuir isotherm showed the best agreement with the experimental results.
김동수,박재범,장성철,Kim, Dong-Su,Park, Jae-Beom,Jang, Seong-Cheol 한국기계연구원 2000 硏究論文集 Vol.30 No.-
Electro-Rheological(ER) fluids change their apparent viscosity according to the electric field strength. The electrical and rheological properties of zeolite based the ER fluids were reported. The electric field dependent yield stress are obtained from experimental investigation on the Bingham property of the ER fluid. Using ER fluids, it is possible to directly interface between electric drop and flow rate of the ER fluid was hydraulic control valve measured under application of an electric field. The purpose of the present study is pressure drop measurement of an ER valve by using strain gage. The performance characteristics of the valve system are evalusted in terms of pressrue fixed with respect to the intensity of employed electric fields and flow rates. As a result, it is esperimentally confirmed that pressure control valve using ER fluids applicable to use in hydraulic power systems.
스퍼터링 공정 압력이 InZnO 박막트랜지스터의 광학 및 전기적 특성에 미치는 영향
박지민,김형도,장성철,김현석,Park, Ji-Min,Kim, Hyoung-Do,Jang, Seong Cheol,Kim, Hyun-Suk 한국재료학회 2020 한국재료학회지 Vol.30 No.4
Amorphous In-Ga-Zn-O (a-IGZO) thin film transistors, because of their relatively low mobility, have limits in attempts to fulfill high-end specifications for display backplanes. In-Zn-O (IZO) is a promising semiconductor material for high mobility device applications with excellent transparency to visible light region and low temperature process capability. In this paper, the effects of working pressure on the physical and electrical properties of IZO films and thin film transistors are investigated. The working pressure is modulated from 2 mTorr to 5 mTorr, whereas the other process conditions are fixed. As the working pressure increases, the extracted optical band gap of IZO films gradually decreases. Absorption coefficient spectra indicate that subgap states increase at high working pressure. Furthermore, IZO film fabricated at low working pressure shows smoother surface morphology. As a result, IZO thin film transistors with optimum conditions exhibit excellent switching characteristics with high mobility (≥ 30㎠/Vs) and large on/off ratio.