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광촉매용 TiO₂ 강유전체 박막의 증착 두께에 따른 Photon Energy 특성에 관한 연구
김병인(Byeung-In Kim),전인주(Jun-In Joo),이상일(Sang-Il Lee) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
This study evaporates TiO₂ layer thickness differently with RF sputtering method on Si Wafer(n-100). Thin film is made with the structure of Si+TiO₂ and Si+TiO₂+Al by evaporating TiN which is used as Antireflection of superintegrated semiconductor integrated circuit with Photo Catalyst. The research is peformed to increase the characteristics of photon energy according to TiO₂ thickness and the reliability and reproductibility of TiO₂ thin film. Reversal of electric Permittivity values is induced by dipole polarization shown in the dielectric of thin film. Complex electric constant (ε₁,ε₂) has larger peak values as it"s thickness is thinner and then it is larger according to the increase of frequency. Electric Permittivity by photon energy has large value in imaginary number and is reduced exponentially by the increase of carrier density according to that of photon energy.
메탈핼라이드 램프용 저주파 구형파 구동의 퍼지제어 전자식 안정기
金柄哲,金亨坤,全仁柱,宋燦日 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
A low frequency square wave driven electronic ballast for metal halide (MH) lamps is developed. The lamp current/wattage is controlled by fuzzy logic controller based on the low cost 8-bit microcontroller. This electronic ballast consists of a buck converter, a low frequency square wave full bridge inverter, a high voltage burst pulse generator using IGBT for the MH lamp ignition, an over-current protection circuit and an 8-bit microcontroller circuit. The ballast system is operated on the constant current mode during the MH lamp start-up process and the system is operated on the constant power mode during steady state. Experimental results show that the fuzzy logic control operation is carried .out successfully by the 8-bit microcontroller PIC16F877. In this electronic ballast system, in spite of the limited control bandwidth caused by low operating speed of the %bit microcontroller, the good performance in the constant lamp current characteristic is obtained. Acoustic resonance of the MH lamps can be effectively avoided because the instantaneous lamp power is fully constant due to the low frequency square wave drive.