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제대혈의 렙틴농도와 샌상아 출생체중 및 각종 대사지표와의 상관관계
조보연,박경수,전종관,박도준,이윤용,박건상,윤보현,김성연,이홍규 대한내분비학회 1999 Endocrinology and metabolism Vol.14 No.2
Background: Leptin, produced in the adipose tissue, is involved in the regulation of body weight. The release of the leptin is increased in obese adults even in children. This study investigated whether the serum leptin in cord blood was related to babys birth weight and metabolic parameters. Methods: 71 pairs of singleton pregnancy babies and their mother were studied. Babies are classified in LGA (large for gestational age), AGA (appropriate for gestational age), SGA (small for gestational age) three groups. After delivery, cord blood and maternal venous blood samples were drawn. We measured the plasma leptin, insulin-like growth factor (IGF)-1, insulin and proinsulin in cord and maternal serum. Results: The concentration of leptin from cord blood was increased in LGA babies and decreased in SGA babies compued with the level in AGA babies. There was positive correlatian (r=0.55, p$lt;0.01) between the plasma leptin level in cord and birth weight. There were positive correlatian between both the plasma proinsulin (r=0.37, p$lt;0.01) and IGF-1 (r=0.32, p$lt;0.01) and birth weight, too. But there was no difference between female and male baby's cord blood leptin level. In multiple regression analysis, cord blood leptin level was found independent factor related to birth weight ( p=0.001) Concludion : The plasma leptin, proinsulin and IGF-1 is correlates to the birth weight. These data provide evidence that leptin and proinsulin are highly related to the nutritional status already during the fetal periods, and effect on the intrauterine fetal growth. (J Kor Soc Endocrinol 14:365~371, 1999)
전해수,이윤용,김재덕,임종성,조정식,박선근 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
기상과 액상 모두를 계속해서 순환시키는 상평형실험장치(circulation type)를 이용하여, CO₂-C₂H_5OH계에 대한 고압기액상평형실험을 313.2 K, 323.2 K, 333.2 K에서 압력 (약 5 ㎫-혼합물의 임계압력부근)을 변화시키면서 수행하였다. 각각의 온도에 대한 혼합물의 임계압력은 8.1㎫, 9.3㎫, 10.6㎫ 정도로서 온도가 증가할수록 혼합물의 임계압력이 증가하는 것을 알 수 있었다. 또 CO₂-C₂H_5OH 및 CO₂-H₂O계의 고압상평형자료를 Adachi와 Sugie의 혼합법칙을 사용한 Patel-Teja의 3차상태방정식에 적용하여 상관시켜 본 결과 만족할 만한 상관결과를 얻었다. High pressure vapor-liquid equilibria for CO₂-C₂H_5OH system were measured at three temperatures of 313.2 K, 323.2 K and 333.2 K using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated over a pressure range from ca. 5 ㎫ up to near mixture critical point. The critical pressures of the mixtures were about 8.1 ㎫, 9.3 ㎫ and 10.6 ㎫ at the three temperatures, respectively. This result shows that the temperature increases with the critical pressure of the mixture. The high pressure vapor-liquid equilibrium data for CO₂-C₂H_5OH and CO₂-H₂O systems were satisfactorily correlated by applying the Patel-Teja equation of state with the Adachi-Sugie mixing rule.
김승재,이윤용,조성용 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
직경이 20㎝이고 자유 면적비가 8.2%인 체단탑의 특성을 공기-물계에서 고찰하였다. 수력학적 특성으로는 체단의 건조 압력강하와 전체 압력강하, 그리고 체단위의 dynamic head와 froth height를 측정하였으며 실험 결과로부터 aeration factor를 계산하였다. 또한 반응증류 모사탑으로써 체단위에서의 액체 체류시간분포를 측정하였으며 성능 향상을 위한 개량된 체단탑을 제안하여 기존의 체단탑과 비교, 고찰하였다. 그 결과, 개량된 체단탑에서는 기존의 체단탑에 비하여 체단 위에서의 액체 체류시간이 약 40%정도 증가하였다. The characteristics of a sieve tray having the 20㎝ diameter and 8.2% free area were studied in an air-water system. Hydrodynamics such as dry pressure drops, total pressure drops, dynamic heads and froth heights on the sieve tray were carried out. Aeration factors were estimated from the experimental results obtained from this work. In addition, the residence time distributions of liquid on the sieve tray as a simulated reactive distillation column were measured and compared with those of the modified sieve tray combined a meshed chamber for an improvement of the performance. As a result, mean residence times on the combined sieve tray are about 40% higher than those on the conventional sieve tray.
전해수,이윤용,임종성,조정식,김재덕 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.4
기상과 액상 모두를 계속해서 순환시키는 circulation type의 고압상평형장치를 이용하여, CO₂-C₂H_5OH-H₂O계에 대한 고압기액상평형실험을 313.2 K와 333.2 K에서 압력 (7.9 ㎫에서 18.5 ㎫까지)과 feed 에탄올농도(20 wt%에서 70 wt%까지 ; CO₂ free basis)를 변화시키면서 수행하였다. CO₂-C₂H_5OH-H₂O계의 고압상평형자료를 Adachi와 Sugie의 혼합규칙을 사용한 Patel-Teja식에 적용하여 상관시켜 본 결과 Wilson type의 혼합규칙, 그리고 Group Contribution Equation of State를 사용할 때보다 기액상평형을 잘 예측할 수 있었고, 본 실험자료와 만족할만한 상관결과를 얻을 수 있었지만, 분리계수나 분배계수의 거동에 대한 예측은 정확하게 표현하지 못하였다. High pressure vapor-liquid equilibria for CO₂-C₂H_5OH₂O system were measured at two temperatures of 313.2 K and 333.2 K using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated over a pressure range from 7.9 ㎫ to 18.5 ㎫. The ethanol concentration in feed varied from 20 wt% to 70 wt% (CO₂ free basis). The Patel-Teja Equation of State with Adachi-Sugie mixing rule predicted the experimental data better than the same equation of state with Wilson type mixing rule and Group Contribution Equation of State, but could not accurately represent the behavior of the separation factor and distribution coefficient.
최대기,이윤용,조성용 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.3
체단(Sieve Tray)에서 기-액간의 접촉 성능을 향상시키기 위하여 체단위에 그물 구조물(Meshed Chamber)를 설치하였을 때 수력학적 특성과 물질전달 특성을 설치하지 않았을 경우와 비교 고찰하였다. 수력학적 특성으로는 공기-물계를 사용하여 체단의 건조 압력강하와 전체 압력강하 그리고 체단위의 Clear Liquid Head를 비교하였으며 물질전달 특성은 탄산-중탄산 완충용액계에서 CO₂ 흡수 실험결과로부터 기-액간 물질전달의 유효 계면면적을 구하여 비교 고찰하였다. In an effort to improve the contacting performance of a sieve tray, a meshed chamber was placed on the sieve tray. Its hydraulic and mass transfer characteristics were measured and compared with those of the sieve tray without the meshed chamber. The hydraulic characteristics of a sieve tray with a meshed chamber such as dry pressure drops, total pressure drops, and clear liquid heads on the tray were compared with the sieve tray alone using the air-water system. Effective interfacial areas on the tray were determined from CO₂ absorption experiments in K₂CO₃KHCO₃ buffer solution and compared with the tray with a meshed chamber.
전해수,최대기,이윤용,김재덕,임종성,조정식,이경록 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.4
초임계유체상과 액상 모두를 계속해서 순환시키는 circulation type의 고압상평형장치를 이용하여 CO₂-C₂H_5-OH-H₂O계 및 CO₂-C₂H_5OH계에 대한 고압상평형실험을 수행하였으며, 에탄올을 고농도로 농축하기 위한 조건을 조사하였다. 그 결과 액상에탄올 고농도영역에서도 기-액 2상이 공존하기 위한 조건, 즉 각 온도에서 계의 압력이 CO₂-C₂H_5OH계의 임계압력(P_(c, m) = 0.1203T-29.44)이하일 때, 에탄올-물의 상압공비조성(89.4 ㏖%)이상으로 에탄올농축이 가능함을 알 수 있었다. 또 에탄올의 물에 대한 분리계수 및 초임계유체상으로의 에탄올용해도 관계를 조사한 결과, Patel-Teja 상태방정식을 이용하여 구한 계산치는 실험치와 정량적으로 많은 오차를 보였지만 정성적으로는 유사한 경향을 나타냄을 알 수 있었다. High pressure vapor-liquid equilibria for CO₂-C₂H_5OH-H₂O and CO₂-C₂H_5OH systems were measured using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated. The conditions to obtain the high ethanol concentration were also investigated. It was possible to concentrate ethanol above the atmospheric ethanol-water azeotropic composition(89.4 ㏖%) when the system pressure was below the critical pressure(P_(c, m) = 0.1203T-29.44) of CO₂-C₂H_5OH system at which vapor-liquid two phases were coexisted at the ethanol high concentration regime. In the relationships between separation factor(ethanol to water) and ethanol solubility in the supercritical fluid phase, it was found that the calculated values by Patel-Teja equation of state had same errors quantitively with the experimental data, but qualitively represented the similar tendencies.