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한국인 간내결석에서 콜레스테롤의 함량과 그 임상적 의의
박윤찬 ( Yoon Chan Park ),김선회 ( Sun Whe Kim ),장진영 ( Jin Young Jang ),윤유석 ( Yoo Seok Yoon ),안영준 ( Young Joon Ahn ),박용현 ( Yong Hyun Park ) 대한소화기학회 2003 대한소화기학회지 Vol.41 No.5
Backgrounds/Aims: Majority of intrahepatic stones found in Korean patients is calcium bilirubinate stone. However, reports defining cholesterol content of intrahepatic stones are rare. This study was conducted to analyze cholesterol content of intrahepatic stone quantitatively and to define its clinical significance. Methods: Chemical assay and supplementary FTIR (Fourier-transform infrared spectroscope) analysis were performed for cholesterol quantification of intrahepatic stones harvested from 89 consecutive patients by choledochoscope. Results: Intrahepatic stones were grouped by gross appearance and there were 3 cholesterol stones, 2 black stones, and 84 brown stones. Chemical assay disclosed that calcium bilirubinate stones (less than 50% cholesterol) were 89.3% (n=75) of brown stones, and mixed cholesterol stones (50-70% cholesterol) were 10.7% (n=9). Cholesterol content of primary intrahepatic stones (25.9±2.5%) were slightly smaller than that of secondary intrahepatic stones (32.8±4.1%), but it could not reach statistical significance (p=0.135). There were no significant differences in chemical composition of intrahepatic stones according to clinical findings such as age, sex, body mass index, laboratory findings, and locations of stones. Conclusions: Intrahepatic stones found in Korean patients have considerably higher cholesterol content than expected by gross inspection. Investigation of the role of cholesterol metabolism in the pathogenesis of intrahepatic stone may be helpful to establish an appropriate strategy of treatment for intrahepatic stone. (Korean J Gastroenterol 2003;41:382-390)
LiIO₃ 및 BBO 결정을 이용한 Ti : sapphire 레이저의 제 2 조화파 발생
오차환(Cha Hwan Oh),추한태(Han Tae Choo),윤태현(Tai Hyun Yoon),안준석(Jun Suck Ahn),박윤찬(Yoon Chan Park),김상기(Sang Gee Kim),김필수(Phil Soo Kim) 한국광학회 1993 한국광학회지 Vol.4 No.2
LiIO₃ 및 BBO 결정에서 Ti:sapphire 레이저에 대한 제 2 조화파 발생 실험을 실시하였다. LiIO₃ 5 ㎜, 10 ㎜의 두 종류를 이용하였으며 BBO의 길이는 7 ㎜이었다. 780 ㎚~810 ㎚ 영역에서의 LiIO₃ 및 BBO 결정에 대한 제 2 조화파 변환 효율을 측정하였고 이론과 비교하였다. 또, 펌프 출력에 따른 제 2 조화파의 출력을 측정함으로서 794 ㎚에서의 제 2 조화파 변환 계수(conversion coefficient)를 구하였으며, 그 값은 LiIO₃ 결정에 대해 (1.06±0.05)×10-⁴ W-¹(10 ㎜), (5.28±0.33)×10^(-5) W-¹(5 ㎜)이었고 7 ㎜의 BBO에 대해서는 (2.96±0.05)×10^(-5) W-¹이었다. We generated the second harmonic of Ti:sapphire laser in LiIO₃ and BBO crystals. Two LiIO₃ crystals and a BBO crystal were used, and the lengths of LiIO₃ crystals were 5, 10 ㎜ and that of BBO was 7 ㎜. We measured the conversion efficiencies of LiIO₃ and BBO in the wavelength range of 780~810 ㎚, and compared with the caculation of theory. The measured second harmonic conversion coefficients were (1.06±0.05)×10-⁴ W-¹(LiIO₃, 10 ㎜), (5.28±0.33)×10^(-5) W-¹(LiIO₃, 5 ㎜), and (2.96±0.05)×10^(-5) W-¹(BBO, 7 ㎜) at the fundamental wavelength of 794 ㎚.