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Propylene 산화반응에서 촉매내 전달 현상의 영향
김상환,이인철,박형상 한국화학공학회 1988 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.26 No.5
Propylene 부분 산화용 tin-antimony oxide계 공업용 촉매에서 촉매내 물질전달 현상이 반응에 미치는 영향을 다공성 매질내의 물질전달에 관한 Dusty-Gas model과 Feng-Stewart model을 이용하여 검토하였다. 본 촉매반응의 경우 촉매내에 multiple solution은 생기지 않았으며, 촉매 내부 전달 현상에 의하여 propylene의 acrolein으로의 선택성은 감소하였다. 위 두 model이 서로 다른 basis를 갖고 있는데 반하여, 기공 크기가 uniform하고 촉매내에서 viscous flow가 없는 경우에는 같은 결과를 보여줌을 알 수 있다. The influence of internal diffusion on the partial oxidation of propylene on the tin-antimony oxide based catalyst has been studied. For this study, two flux relations in the porous medium (Dusty-Gas model and FengStewart model) have been adopted. In this catalytic reaction system, multiple solution problem has not happened and the internal diffusion decreases the selectivity of propylene to acrolein. The two models differ conceptually, but it has been known that they give the same result for the catalytic reaction system of uniform pore size and no net viscous flow.
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National Utilization of Calcium Supplements in Patients with Osteoporotic Hip Fracture in Korea
김상환,고영봉,이영균,홍석우,최형진,하용찬,신찬수 대한골대사학회 2013 대한골대사학회지 Vol.20 No.2
Background: Calcium is prescribed worldwide for patients diagnosed with osteoporosis. However, the national utilization of calcium and compliance with calcium is unclear in Korea. Our purpose is to evaluate Korea's national utilization of calcium and compliance with calcium in patients with osteoporotic hip fracture from 2007 to 2010 using data from the Health Insurance Review and Assessment (HIRA) Service. Methods: From 2007to 2011, osteoporotic hip fractures were identified using the International Classification of Diseases, 10th revision (ICD-10) and procedure code form from the nationwide data-base of the Health Insurance Review and Assessment Service. Compliant users of calci-um were defined as the patients’ medication possession ratio of 80 or more. We analyzed the compliance of calcium according to age and gender. Results: Among 85,228 pa-tients with hip fracture, 20,800 patients (24.4%) received a prescription of a calcium sup-plement. Among them, only 1,692 patients (8.1%) were identified as compliant users of calcium. The proportion of compliant users was higher in women than men in all age groups. The proportion of compliant users decreased with age in women. Conclusions:In Korea, the national utilization of calcium was low and compliance with calcium was unsatisfactory even in patients with osteoporotic hip fracture.
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소 수정란의 할구 분리방법에 따른 생존율 및 성판별 PCR의 개선
김상환,김경래,이호준,정덕원,김대은,이득환,윤종택 韓國受精卵移植學會 2013 한국동물생명공학회지 Vol.28 No.3
The present study was conducted to compare on embryo survival rates by blastomere isolation methods, and establish the optimal PCR procedure for perform the sexing of bovine blastocysts produced by IVF. IVF embryos used in the study was used the Bisected or Sliced methods for blastomere isolation, and the survival rates of blastocyst with rapid way of sexing PCR was assessed. In the present study for survival rates in blastocyst was the total cleavage rate was 75% and a blastocyst development among cleaved embryos was 40%. Survival rate of embryos treated with intact, bisected or sliced method was 100, 63.3 or 81.3%, respectively. Therefore, survival rate of embryos treated with sliced method was higher compared to that of embryos treated with bisected method. The sexing rate of female or male was not significantly different between S4BFBR primer and BSY + BSP primer (1.75 : 1 vs. 1.43 : 1), respectively. Because of the PCR amplification using the S4BFBR primer was simpler method than multiplex PCR amplification method. Furthermore, the accuracy of sexing rate and reduction of PCR work time between 2-step and 3-step of PCR methods was 98.0% / 1.5 hr and 97.0% / 3.5 hr, respectively. Based on these results, it can be suggested that the sliced and PCR methods we developed was very effective method to reduce time consuming and procedure of PCR amplification for sexing with the increase of survival rate on the blastocyst.
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사질토 지반에서 강지보를 고려한 신개념 지보시스템에 대한 연구
김상환,김지태,강준구,Kim, Sang-Hwan,Kim, Ji-Tae,Kang, Jun-Gu 한국터널지하공간학회 2011 한국터널지하공간학회논문집 Vol.13 No.5
본 논문은 록볼트를 강지보와 체결한 신개념 지보시스템을 연구하였으며 본 연구를 수행하기 위해 실험 및 수치해석을 실시하였다. 실험적 연구로서 축소모형실험을 사질토지반에서 실시하여 기존의 지보시스템과 신개념 지보시스템을 비교하였으며, 신개념 지보시스템의 축소모형실험 결과를 확인하기 위해 수채해석을 실시하였다. 터널에 신개념 지보시스템을 적용할 경우 터널의 손상을 감소시키는 것을 확인하였다. This paper presents a new supporting system using steel ribs. In order to perform this research, experimental and numerical studies were performed. In the experimental study, the scaled model tests for the new supporting system consisting of the steel ribs and rock bolts were carried and compared with the conventional existing supporting system. The numerical simulation was carried out to evaluate the new supporting system to verify the experimental results. It was found that the new tunnel supporting system will reduce the tunnel damage.
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칡소의 MC1R의 유전자형에 따른 교배 조합이 자손의 모색과 유전자형 변이에 미치는 영향
김상환,정경섭,이호준,백준석,정덕원,김대은,윤종택 韓國受精卵移植學會 2013 한국동물생명공학회지 Vol.28 No.3
Bovine coat color is decided by the melanocortin receptor 1 (MC1R) genotype mutation and melanogenesis. Specially, in the various cattle breeds, dominant black coat color is expressed by dominant genotype of ED, red or brown is expressed in the frame shift mutation of recessive homozygous e by base pair deletion and wild type of E+ is expressed in various coat colors. However, not very well known about the effected of MC1R genotype mutation on the coat color through family lines in KBC. Therefore, this study were to investigate effect of MC1R genotype mutation on the coat color, and to suggest mating breed system in accordance with of MC1R genotype for increased on brindle coat color appearance. Parents (sire 2 heads and dam 3 heads) and offspring (total : 54 heads) from crossbreeding in KBC family line with the MC1R genotype and phenotype records were selected as experimental animals. The relationship between melanocortin 1 receptor (MC1R) genotypes expression verified by PCR-RFLP, and brindle coat color appearance to the family line of the cross mating breed from MC1R genotype pattern was determined. As a result, 4MC1R genetic variations, E+/E+ (sire 1), E+/e (sire 2 and dam 3), E+/e with 4 bands of 174, 207 and 328 bp (dam 1) and E+/e with 3 bands of 174, 207, 328 and 535 bp (dam 2) from parents (sire and dam) of KBC. However, 3 genetic variations, e/e (24%), E+/E+ (22%) and E+/e (56%) were identified in offspring. Also, brindle coat color expressrated was the e/e with the 0%, E+/E+ with 67% and E+/e with 77% from MC1R genotype in offspring on the cross mating of KBC. Furthermore, when the sire had E+/e genotype and the dam had E+/E+ with the 3 bands or E+/e genotype, and both had whole body-brindle coat color, 62% of the offspring had whole body-brindle coat color. Therefore, the seresults, the mating system from MC1R genotype patterns of the sires (E+/e) and dams (E+/E+ with the 3 bands or E+/e) with brindle coat color may have the highest whole body-brindle coat color expression in their offspring.
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