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정운익,강문일,진영화,Chung Un-ik,Kang Mun-il,Jean Young-hwa 대한수의사회 1985 대한수의사회지 Vol.21 No.1
A disease characterized by an acute respiratory syndrome occured in a large fattening farm for calves located in Chung-nam Province, July, 1983. The first onset of the disease was in the herd consisting of 12 calves transported and mixed from the surburbs
Un Ik Chung(鄭雲翼) 한국예방수의학회 1979 예방수의학회지 Vol.3 No.2
The detection and elimination of the damaged meat are the most important steps in meat hygiene. This paper described the physiological nature of the muscular tissue and discussed the differential diagnosis of meat damages with reference to causes. Discussions were also made on various factors affecting the deleterious changes of marketing meat.
박익근 ( Ik Keun Park ),박은수 ( Un Soo Park ),김현묵 ( Hyun Mook Kim ),안형근 ( Hyung Keun Ahn ),김정석 ( Chung Soek Kim ),권숙인 ( Sook In Kwun ),변재원 ( Jai Won Byeon ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
It is very important to evaluate the surface or subsurface microstructure because of th on mechanical properties of materials. Surface SH-wave which is horizontally polarized traveling along near surface and subsurface layer is an attractive technique for material difficulty in preparing specimens form in-service industrial facilities. In this stud evaluation for degraded structural materials used at high temperature by Surface SH-wave discussed. 2.25Cr-lMo steel specimens which were prepared by the isothermal aging heat tr 650° were evaluated by ultrasonic nondestructive evaluation techniques investigating th velocities, attenuation coefficient and amplitude spectra etc. In addition, it has verif the frequency-dependence of ultrasonic group velocity and attenuation coefficient using wav
초음파를 이용한 2.25Cr-1Mo 고온 구조재 열화ㆍ손상의 비파괴평가
박익근(Ik Keun Park),박은수(Un Su Park),김정석(Chung Seok Kim),김현묵(Hyun Mook Kim),권숙인(Sook In Kwun),변재원(Jai Won Byeon) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Ultrasonic is a powerful nondestructive technique for the purpose of microstructure evaluation and getting the information of material properties in services facilities. In this study, nondestructive evaluation for degraded structural materials used at high temperature by conventional L-wave and surface SH-wave is discussed. Sixteen kinds of 2.25Cr-1Mo steel specimens with different degradation levels which were prepared by the isothermal aging heat treatment at 650℃ were evaluated by ultrasonic nondestructive evaluation investigating the change of attenuation coefficient analyzed by spectral analysis. As carbide precipitation increase and spherodization near grain boundary of microstructure to aging degradation, attenuation coefficient had a tendency to increase as aging time. It was identified possible to evaluate degradation using the characteristics of surface SH wave. Most of all, frequency dependency of ultrasonic attenuation coefficient to aging degradation appeared prominently on the surface SH-wave. And it was also observed that the change of ultrasonic attenuation with aging time was more sensitive at high frequency region and surface SH-wave mode.
Synthesis and Antifungal Activity of 2,5-Disubstituted-6-arylamino-4,7-benzimidazolediones
Ryu, Chung-Kyu,Song, Eun-Ha,Shim, Ju-Yeon,You, Hea-Jung,Choi, Ko Un,Choi, Ik Hwa,Lee, Eun Young,Chae, Mi Jin 梨花女子大學校 藥學硏究所 2002 藥學硏究論文集 Vol.- No.11
2,5-Disubstituted-6-arylamino-4,7-benzimidazolediones were synthesized and tested for in vitro antifungal activity against pathogenic fungi. Among them, 6-arylamino-5-chloro-2-(2-pyridyl)-4,7-benzimidazolediones exhibited potent antifungal activity against Candida specis and Aspergillus niger.