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Xenon flashlamp와 광촉매를 이용한 타원형 반응기의 살균 특성에 관한 연구
이동길(Dong-Gil Lee),홍지태(Ji-Tae Hong),최경화(Kyoung-Hwa Choi),차재호(Jaeho Cha),김홍주(Hong-Ju Kim),김희제(Hee-Je Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.3
In this paper, we invented a new and unique technique for the sterilization of Escherichia coli(E. coli) in polluted water. We applied a rich ultra-violet(UV) light from pulsed xenon flashlamp and photocatalyst(TiO₂) to sterilize E. coli in polluted water. This method based on the use of UV light and photocatalyst is eco-friendly and does not cause secondary pollution. The proposed elliptical reactor is able to concentrate on quartz sleeve coated TiO₂ or general quartz sleeve. The primary objective of our research was to determine the important parameters such as pulse repetition rate and input voltage and to know on the sterilizing efficiency of quartz sleeve coated TiO₂ and general quartz sleeve. We obtained to achieve 99.999% sterilization in as little as 6 pulses at 800 V in case of quartz sleeve coated TiO₂, and 10 pulses at 800 V in case of general quartz sleeve for 5 minutes. Although transmitted light of quartz sleeve coated TiO₂ is deceased, the sterilizing efficiency is increased by 40% than general quartz sleeve. The reason of high sterilizing efficiency is that generated hydroxyl radical(OH) by photocatalyst and is able to concentrate light at a focus by using elliptical reactor.
자동차 밸브용 강재의 봉대봉 이종마찰용접부의 피로수명에 관한 연구
이동길(Dong-Gil Lee),이상열(Sang-Ryoul Lee),정재강(Jae-Kang Chung) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The fatigue crack propagation behavior was tested with STR3, martensite stainless steel, and STR35, austenite stainless steel, to look over the fatigue properties on the friction welding zone according to the small artificial defect positions. From the experiment, the fatigue limits of the STR3 and STR35 base metal were 429.0㎫ and 409.4㎫ respectably. The fatigue lifes of the STR35 specimens showed about 190% for base metal specimen, about 82% for 1.0㎜ HAZ specimen higher than that of the STR3. To the contrary, the fatigue life of the STR35 specimens showed about 35% for 0.5㎜ HAZ specimen lower than that of the STR3. And the fatigue life of weld interface specimen was much lower than that of the other specimens.