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PIV와 LDV를 이용한 냉각수 토출구 주위의 와류 가시화 연구
홍지우(Ji-Woo Hong),신수용(Su-Yong Shin),안병권(Byoung-Kwon Ahn) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.3
Submerged and semi-submerged vehicles expel cooling water through an outlet. In this process, induced noise and vibration by the flow around the outlet have been reported, and it may cause problems directly related to survivability of the navy vessels. The coolant outlet has a net-type structure and circular columns are mostly used. In this study, flow measurements using PIV and LDV were performed for different type outlets; conventional (flat plate with round bar) and improved (flat and flat plate) configurations. Experiments were conducted at a cavitation tunnel where pressure and steady flow rate conditions are ensured for sufficient time to measure the flow. The average velocity field of the outlets were measured and compared through LDV measurements, and instantaneous vorticities were evaluated through PIV measurements. The results show that the improved type of the outlet is advantageous in terms of flow stability compared to the conventional type of the outlet.
양기숙(Ki Sook Yang),신수용(Su Yong Shin),황인숙(In Sook Whang),박성배(Sung Bae Park),김태희(Tae Hee Kim) 한국생약학회 1992 생약학회지 Vol.23 No.1
The effects of Gamdutang extract on the toxicity of lead acetate in mice were examined. Mice were given intraperitoneally daily doses of lead acetate 50㎎/㎏ with Gamdutang Ex. 250 ㎎/㎏, 500 ㎎/㎏ and 1,000 ㎎/㎏ for two weeks. The exposure of Pb(Ac)₂showed the toxicity at all experimental assay such as the gain of body weight, the ratio of organ weight to body weight, serum transaminase activity and cholesterol contents. This toxicity was restored significantly by Gamdutang Ex. administration.