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황석순,김권배,손수인,서영숙,김기식,김윤년 啓明大學校 醫科大學 1990 계명의대학술지 Vol.9 No.3
To evaluate the relationship between coronary artery disease(CAD) and the various levels of lipid and lipoproteins, we performed coronary angiography to the patient, who were suspected coronary artery disease from January 1988 to August 1989. And compared it with normal control group. The number of control group were 41(21 men, 20 women), and the patient group were 52(42 men, 10 women). The age was not differ between two groups. The results were as follows; 1. In CAD group, the plasma concentration of total lipid, triglyceride, total cholesterol, phosphlipid, and TC/HDL ratio were significantly higher than in control group. But, though, the concentration of HDL was lower in CAD group, had no significant difference between two groups. 2. The severity of CAD were well correlated with total lipid, cholesterol, LDL, trigylceride, phospholipid, TC/HDL, LDL/HDL levels. HDL level didnt's show significant correlation with the degree of CAD. We concluded that total lipid, cholesterol, trigylceride TC/LDL ratio were valuable markers of CAD in Korean, but futhur studies of lipoproteiins and other risk factors in the large population will be recommended.
Electron Cyclotron Resonance O_2 Plasma에서 증착한 규소 산화 박막의 특성
안명환,서문석,장재선,서성모,이기방,윤창주,이형재,남기석,최규현,손춘배,김용섭,강석희 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-
규소 산화막을 ECR-CVD(electron cyclotron resonance-chemical vapor deposition) 증착방법으로 5인치 기판위에 상온에서 증착하고, 증착공정조건인 증착율, 기판온도, 마이크로파의 세기변화 및 플라즈마 혼합기체의 비에 따른 규소 산화막의 특성을 조사하였다. 또한 산화막의 구조적인 특성을 비교하기 위해 FTIR을 이용하여 ECR-CVD 증착한 산화막, RPE-CVD(remote plasma enhanced-CVD) 증착한 산화막 및 열 산화막의 stretching frequency를 측정하였다. 측정된 결과 ECR-CVD로 증착된 산화막이 구조적인 면에서 열 산화막과 거의 같음을 보였다. ECR-CVD로 증착된 산화막의 전기적인 특성을 전류-전압 및 축전-전압 측정에의하여 분석하였다. 축전된 산화막의 전기적인 특성은 산화막의 전하 밀도는 1×10 exp (11)/㎠이였고, 평균 절연 파괴 전압은 약 6 MV/㎝이다. We have grown thin films of SiO_2 at room temperature by using an ECR-CVD system and have investigated the changes in the properties of the deposited films with changes in the processing conditions such as the deposition rate, the substrate temperature, the microwave power and the plasma gas mixing ratio. We also measured the stretching frequency of three kinds of oxides, and ECR-CVD-grown oxide, a PECVD-grown oxide, and a thermally grown oxide, using FTIR analysis to compare their structural properties. The result shows that the structural properties of the ECR-grown oxide are similar to those of the thermally grown oxide. Additionally, the electrical properties of the ECR-grown oxide were investigated by using current-voltage and capacitance-voltage measurements. These electrical results indicate that the oxide charge density and the average breakdown voltage are 1×10 exp (11) ㎝^-2 and 6 MV/㎝, respectively.
n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구
유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-
승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.
윤영석(Young Suk Yoon),구완서(Wan Suh Koo),박인석(In Suk Park),김석영(Suk Young Kim),최의진(Euy Jin Choi),방병기(Byung Kee Bang) 대한내과학회 1991 대한내과학회지 Vol.41 No.2
N/A To investigate a possible association between intracellular free calcium and blood pressure in normotensive subjects and patients with essential hypertension, intraplatelet free calcium was measured with intracellularly trapped fluorescent indicator Fura 2-AM. The results were as follows: 1) Intraplatelet free calcium levels were significantly higher in patients with essential hypertension than in normotensive subjects (222.4±58.0 vs. 119.6±10.9 nM; p < 0.0001). 2) There was a close correlation between the intraplatelet free calcium levels and the systolic, diastolic and mean blood pressure (n=45; r=0.817 for SBP, 0.728 for DBP, 0.800 for MBP; p<0.0001, respectively). 3) Antihypertensive treatment with calcium channel blookers or beta-blockers resulted in a reduction in both blood pressure and intraplatelet free calcium(p<0.0001). 4) There was a significant correlation between intraplatelet free calcium and serum cholesterol concentration (r=0.462, p<0.05). Based on the above findings, there was a close correlation between the free calcium level in platelets and blood pressure, and the serum cholesterol concentrations. Antihypertensive treatment with calcium channel blockers or beta blockers resulted in a reduction in free calcium, which correlated with the fall in blood pressure.
정중기(Jung Kee Chung),서준석(Jun Suk Suh),홍인규(Inn Gyu Hong),권오중(Oh Joong Kwon),박연호(Yeon Ho Park),서경석(Kyung Suk Suh),김선희(Sun Whe Kim),박용현(Yong Hyun Park) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.1
N/A Background/Aims: Patient with choledocholithiasis(CL) may have residual stones postoperatively and cholodochoscopic extraction became one of the main therapeutic modalities recently. Analysing the incidence of postoperative residual stones in cholodocholithiasis patients and the effect of choledochoscopic stone remova], we may have the necessity of some modification of operation procedures such as cutaneous jejunostomy. Methods: Analysing c]inical data of 64 patients who were confirmed as having biliary stones during operation and were c>perated during the 4 year period until 1994, we investigated the relationship between operation modality and incidence of residual stone and effectiveness of endoscopic extraction and of medical management on postoperative periods. Results: Residua) stones(RS) were noted in 35.9%(23/64) of operated choledocholithiasis patients and by operative procedure, choledochojejunostomy cases had the highest incidence of RS at 58.3%. Complete removal of RS by choledochoscopy was achieved in 8 of 14 cases and two cases of recurrent and 4 case of remaining stones were managed medically. Conclusions: In managing CL patients, left lobectomy of liver is one of tbe definite treatment modalities in left sided CL and in right sided CL with high suspicion of RS, additive cutaneous jejunostomy on conventional choledochojejunostomy may have beneficial ro)e in long term postoperative choledochoscopic trial. (Korean J Gastroenterol 1997; 29:93 - 101)