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권혁문(Hyuk-Moon Kwon),곽동주(Dong-Joo Kwak),성열문(Youl-Moon Sung),송재은(Jae-Eun Song) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In this study, used simplest sandwich cells containing Ru2? liquid electrolytes in order to clarify the role of nanoporous TiO₂ electrodes. And, the cell structure is as follow: F:SnO₂ glass/ nanoporous TiO₂/ tris(2,2'-bipyridy)ruthenium(Ⅱ) colplex [Ru(bpy)₃(PF?)₂] in acetonitrile/ F:SnO₂ glass. The result, we found that ECL intensities increased rapidly by use of cathodes with nanoporous TiO₂ layers. And, porous TiO₂ electrodes were confirmed to be efficient for ECL devices as well as solar cell devices. It is thought that the increases in the ECL intensities may be associated with both formation of Ru? in porous TiO₂ electrodes and the process taking place after reduction of Ru? which occurs in the nanoporous electrodes.
권혁문(Hyuk-Moon Kwon),성열문(Youl-Moon Sung),박차수(Cha-Soo Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Electrochemiluminescence (ECL) involves the generation of species at electrode surfaces that then undergo electron-transfer reactions to form excited states that emit light. ECL is a means of converting electrical energy into radiative energy. It involves the production of reactive intermediates from stable precursors at the surface of an electrode. These intermediates then react under a variety of conditions to form excited states that emit light. In this work, the ECL cell using nanocrysralline TiO2 electrode and Ru (Ⅱ) complex (Ru(bpy)32+) is fabricated for low-cost high-efficient energy conversion device application. The nanocrysralline TiO2 electrode (∼10 ?m thickness) with large surface area (∼360 ㎡/g) can largely inject electrons from nanoporous TiO2 layer and allows the oxidation/reduction of Ru (Ⅱ) complex in the nanopores. The cell structure is composed of a glass/ FTO/ nanocrysralline TiO2/ Ru (Ⅱ) complex in acetonitrile/ FTO/ glass.
권혁문(Hyuk-Moon kwon),카오미드(Accarat Choumead),성열문(Youl-Moon Sung),박차수(Cha-Soo Park) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
Electrochemiluminescence (ECL) involves the generation of species at electrode surfaces that then undergo electron-transfer reactions to form excited states that emit light. ECL is a means of converting electrical energy into radiative energy. It involves the production of reactive intermediates from stable precursors at the surface of an electrode. These intermediates then react under a variety of conditions to form excited states that emit light. In this work, the ECL cell using nanocrystalline TiO₂ electrode and Ru (Ⅱ) complex (Ru(bpy)₃²?) is fabricated for low-cost high-efficient energy conversion device application. The nanocrystalline TiO₂ electrode (~10 ㎛ thickness) with large surface area (~360 ㎡/g) can largely inject electrons from nanoporous TiO₂ layer and allows the oxidation/reduction of Ru (Ⅱ) complex in the nanopores. The cell structure is composed of a glass/ FTO/ nanocrystalline TiO₂/ Ru (Ⅱ) complex in propylene carbonate/ ITO/ glass.
권혁문(Hyuk-Moon Kwon),곽동주(Dong-Joo Kwak),박민우(Min-Woo Park),성열문(Youl-Moon Sung) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
본 연구에서는 DSCs 제작시 고가의 TCO전극을 사용하지 않고, Ti plate와 SUS plate를 작업전극으로 대체하여 DSCs를 제작하였다. Ti plate와 SUS plate를 작업전극을 제작한 샘플은 Jsc 및 효율에서 큰 차이를 보였지만, 상대전극으로 사용시 큰 차이가 없었다. 이는 백금을 코팅한 상대전극에서 빛이 반사되어, 입사되는 빛의 양이 줄어들었기때문에 Jsc 및 효율이 낮게 나온것으로 판단되었다. 향후 FTO glass에 백금을 스퍼터링하여 투명도를 조절하는 실험이 필요할 것으로 보인다.
나노입자 이산화티타늄 전극 기반의 고효율 전기화학형 발광 셀 제작
권혁문(Hyuk-Moon Kwon),한치환(Chi-Hwan Han),성열문(Youl-Moon Sung) 대한전기학회 2010 전기학회논문지 Vol.59 No.2
In this work, electrochemiluminescence (ECL) cell using nanocrysralline TiO₂ electrode and Ru(Ⅱ) complex (Ru(bpy)₃<SUP>2+</SUP>) is fabricated for low-cost high-efficient energy conversion device application. The nanocrysralline TiO₂ layer (~10㎛ thickness) with large surface area (~360㎡/g) can largely inject electrons from nanoporous TiO₂ electrode and allows the oxidation/reduction of Ru(Ⅱ) complex in the nanopores. The cell structure is composed of a glass/ F-doped SnO₂(FTO)/ porous TiO₂/ Ru(Ⅱ) complex in acetonitrile/ FTO/ glass. The nanocrysralline TiO₂ layer is prepared using sol-gel combustion method. The ECL efficiency of the cell consisting of the porous TiO₂ layers was 250 ㏅/W, which was higher than that consisting of only FTO electrode (50㏅/W). The nanoporous TiO₂ layers wwas effective for increasing ECL intensities.
노형운(Hyung-Woon Roh),김재수(Jae-Soo Kim),서상호(Sang-Ho Suh),권혁문(Hyuk-Moon Kwon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Catheters are used to measure translesional pressure gradients in the stenosed coronary arteries.<br/> Catheter insertions during coronary angioplasty cause flow obstructions. A narrowed flow cross section<br/> with catheter present effectively introduced a tighter stenosis than the enlarged residual stenoses after<br/> balloon angiplasty. In this study, three dimensional computer simulations are conducted to investigate<br/> the flow blockage effects due to the catheter insertions during the coronary angioplasty. This study is<br/> also extended to investigate the effects of stenotic vessel sizes and shapes, catheter size and<br/> positioning effects on the blood flow characteristics.
시뮬레이션에 의한 道路橋의 耐久性 推定을 위한 荷重列 發生
金炅燦,權赫文 領南大學校 産業技術硏究所 1990 연구보고 Vol.18 No.2
Vehicular loads are simulated for the estimation of the durability of highway bridges. The following observations are made: 1) In the simulation of vehicular loads, actual time-headways are most appropriately represented by log-normal distribution for all groupings of vehicle types, and speeds are by normal, log-normal or gamma distribution depending on the type groupings. 2) Simulated vehicular loads may be used in the analysis of the reliability of highway bridges and in determining the maximum expected live load for given probability of occurrence. 3) Collection on continuous basis of basic data, which enter in the simulation of vehicular loads, enables the prediction of cumulative fatigue damage on bridges.