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조용진,정동윤,최홍대,박종희,손병화,Cho, Yong-Jin,Jeong, Dong-Youn,Choi, Hong-Dae,Park, Jong-Hee,Son, Byeng-Wha 한국생약학회 1998 생약학회지 Vol.29 No.3
Two isoflavonoids were isolated from the flowers of Pueraria lobata (Flos puerariae) guided initially fractionation based on brine shrimp lethality assay. The structures were identified as 4',5,7-trihydroxy-6-methoxyisoflavone (tectorigenin) and 4',7-dihydroxy-6-methoxyisoflavone (glycitein), respectively, on the basis of their spectroscopic and physicochemical evidences.
조용진(Yong-Jin Cho),한송이(Song-I Han) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.5
This study examined the use of LIT (lock-in infrared thermography) to detect defects in the welded parts of ships and offshore structures. A quantitative analysis was used with the filtering and texture measurement of image processing techniques to find optimized experimental condition. We verified the reliability of our methods by applying image processing techniques in order to normalize the evaluations of comparative images that showed a phase difference. In addition, it was found that a low to mid-range intensity of light exposure on the surface showed good results, whereas high exposure did not provide significant results. A lock-in frequency of around 0.1 Hz was satisfactory regardless of the intensity of the light source. In addition, making the integration time of the thermography camera inversely proportional to the intensity of the exposed light source during the experiment provided good results.
함정 적외선신호 민감도 해석을 통한 기상변수 영향에 관한 연구
조용진(Yong-Jin Cho),정호석(Ho-Seok Jung) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.3
According to a study on improving ship survivability, an IR signature represents the contrast radiance intensity between the radiation signature from a ship and the background signature. It was found from applying stealth techniques to the process of ship development that the IR signature is remarkably sensitive and dependent on the environment. In this study, marine climate data for the sea near the Korean Peninsula were collected, and the marine meteorological environment in Korean waters was defined. Based on this data, a study on the sensitivity of the IR signature of target objects was performed using analytical methods. The results of the research indicated that clouds have important effects on the infrared signature, but the velocity of the wind and the humidity have only slight effects on the IR signature. In addition, the air and seawater temperatures had hardly any effect on the IR signature, but it is judged that additional study is needed.