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박석인(S. Park),한수빈(S. Han),정봉만(B. Jung),김규덕(G. Kim),정학근(H. Jeong),유승원(S. Yu) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
Electrodeless fluorescent lamps utilizing an inductively coupled plasma were found to have a long lifetime and high efficacy and now are used in some indoor and outdoor applications. This paper gives a basic data of electrodeless fluorescent lamp "QL"(Philips). The experimental system consist of QL 85W/840 lamp and QL 85W S/03 ballast.
A Power Control Scheme of a Fuel Cell Hybrid Power Source
Yujin Song(송유진),S. B. Han(한수빈),S. I. Park(박석인),H. G. Jeong(정학근),B. M. Jung(정봉만),G. D. Kim(김규덕),S. W. Yu(유승원) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
This paper describes a power control scheme to improve the performance of a fuel cell-battery hybrid power source for residential application. The proposed power control scheme includes a power control strategy to control the power flow of the fuel cell hybrid power system and a digital control technique for a front-end dc-dc converter of the fuel cell. The power control strategy enables the fuel cell to operate within the high efficiency region defined by the polarization curve and efficiency curve of the fuel cell. A dual boost converter with digital control is applied as a front-end ed-ed converter to control the fuel cell output power. The digital control technique of the converter employs a moving-average digital filter into its voltage feedback loop to cancel the low frequency harmonic current drawn from the fuel cell and then limits the fuel cell output current to a current limit using a predictive current limiter to keep the fuel cell operation within the high efficiency region as well as to minimize the fuel cell oxygen starvation.
박석인(S. Park),한수빈(S. Han),정봉만(B. Jung),김규덕(G. Kim),함중걸(J. Ham) 한국조명·전기설비학회 2002 한국조명·전기설비학회 학술대회논문집 Vol.2002 No.-
Electrodeless fluorescent lamps utilizing an inductively coupled plasma were found to have a long lifetime and high efficacy and now are used in some indoor and outdoor applications. This paper gives a basic data of electrodeless fluorescent lamp ‘Endura’(OSRAM SYLVANIA ICETRON/ENDURA 150W). The experimental system consist of ENDURA 150W/840 Coolwhite lamp and ENDURA 150/200-240 S ballast.
PTA 법에 의한 스텔라이트 12 합금 육성층의 조직과 경도에 미치는 전류와 예열온도의 영향
정병호,김민영,김무길,김규덕,이성열 한국열처리공학회 2000 熱處理工學會誌 Vol.13 No.4
Stellite 12 alloy-powder was overlaid on 410 stainless steel valve seat using plasma transferred arc(PTA) process. Variation of characteristic of microstructure and hardness of deposit with current(90-150A) and preheat temperature(R.T.∼400℃) was investigated. Important conclusion obtained are as follows; All welding conditions used produced a sound deposit layer with no defect in single pass welding. The maximum deposit had 4.0∼4.8㎜ in thickness and its bead width was increased with increase of current and preheat temperature. The deposit showed hypoeutectic microstruture, which was consisting of primary cobalt dendrite and networked M_7C₃type eutectic carbides. The amount of eutectic carbides was decreased and its dendritic secondary arm spacing was increased with increase of current. Hardness of the deposit was decreased with increase of current. Preheat temperature up to 400℃, however, showed little influence on the hardness and microstructure. The hardness was also influenced by diluted Fe content near the interface in addition to microstructure and dendritic secondary arm spacing. Hot hardness at 500℃ showed higher than 300HV.