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HyoungCheol Lee,GeunYoung Yeom,Jin Koog Shin,Sung Il Baik,Yoo Jin Lee,Young Woon Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
In this study, silicon thin films were deposited by using a transformer-coupled-plasma chemicalvapor deposition (TCPCVD) technique using SiH4/H2/PH3, and the effects of rf power on the structural and the electrical properties of the deposited thin films were investigated for applications to silicon solar cells. Increasing the rf power from 50 to 500 W increased the percent of crystalline silicon in the film from 42 to about 79 %. The increase in crystalline silicon was mostly attributed to an increase in the number of nanosized crystalline silicon grains having grain sizes from 3 to 15 nm. The increase in crystalline percent was also accompanied by an increase in the stress in the film. The increased crystalline silicon percent in the films increased the dark conductivity and, at 500 W of rf power, a dark conductivity of 10 −1cm−1 could be obtained for a 40-nm-thick film, which is applicable to silicon-based solar cells.
하이브리드 굴삭기의 상위제어기 개발을 위한 MILS 환경 구축
진기창(Kichang Jin),박태호(Taeho Park),이지호(Jiho Lee),정유석(Yuseuk Jung),권영민(Youngmin Kwon),이형철(Hyoungcheol Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The hybrid excavator is designed and constructed by replacing the hydraulic components of the conventional hydraulic excavator with the electric components. The target hybrid excavator of this research is the compound hybrid excavator replacing only the swing part with the electric motor. This paper presents dynamic modeling of the compound hybrid excavator including an engine, a generator, ultra capacitors, hydraulic components and the swing part. The developed model is programmed with the AMESim and validated by the experimental data.