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염료감응형 태양전지 광전극의 초음파 열처리를 통한 광전효율 개선에 관한 연구
金熙濟(Hee-Je Kim),金龍哲(Yong-Chul Kim),崔津英(Jin-Young Choi),金昊成(Ho-Sung Kim),李東吉(Dong-Gil Lee),洪知兌(Ji-Tae Hong) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
A making process of DSC(dye sensitized solar cell) was presented. In general, Photo electrodes of DSC was made by using colloid paste of nano TiO₂ and processing of Doctor-blade printing and high temperature sintering for porous structure. These methods lead to cracks on TiO₂ surface and ununiform of TiO₂ thickness. This phenomenon is one factor that makes low efficiency to cells. After TiO₂ printing on TCO glass, a physical vibration was adapted for reducing ununiform of TiO₂ thickness. And a thermal treatment at Low temperature(under 75℃) was adapted for reducing cracks on TiO₂ surface. In this paper, we have designed and manufactured an ultrasonic circuit (100W, frequency and duty variable) and a thermal equipment. Then, we have optimized forcing time, frequency and duty of ultrasonic irradiation and thermal heating for surface treatment of photo-electrode of DSC. In I-V characteristic test of DSC, ultrasonic and thermal treated DSC shows 19% improved its efficiency against monolithic DSC. And it shows stability of light-harvesting from drastically change of light irradiation test.
선박 추진축계의 임계 속도 및 휘돌림 응답에 관한 연구
金龍哲,李建都 嶺南大學校 工業技術硏究所 1993 工業技術硏究所論文集 Vol.21 No.2
In the present study the lateral vibration characteristics of marine propeller shafts are investigated. As a solution method the transfer matrix method is employed to calculate the critical speeds and the whirling response of a marine propeller shaft. The modelling procedure was also developed, From numerical results, it was found that the elliptical motion and the backward whirling response can be caused by asymmetric stiffness of the oil film. Furthermore, in the case of marine propeller shaft the critical speed is sensitive to the position and the supporting conditions of the journal bearings.