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Semiempirical MO Study on Malonyl-CoA. 1. Malonic Acid and Malonyl Methyl Sulfide
유인기,김영주,김시춘,김유삼,강영기,Yu, In Gi,Kim, Yeong Ju,Kim, Si Chun,Kim, Yu Sam,Gang, Yeong Gi Korean Chemical Society 1995 Bulletin of the Korean Chemical Society Vol.16 No.2
The conformational study on malonic acid, hydrogen malonate, malonate, malonyl methyl sulfide, and malonyl methyl sulfide anion, as the model compounds of malonyl-CoA, was carried out using the semiempirical MO methods (MNDO, AM1, and PM3) and hydration shell model. On the whole, the feasible conformations of malonic acid, hydrogen malonate, and malonate seem to be similar to each other. In malonic acid and malonate, two carboxyl groups are nearly perpendicular to the plane of the carbon skeleton, despite of different orientation of two carboxyl groups themselves. In particular, two carboxyl groups of hydrogen malonate are on the plane formed by carbon atoms with an intramolecular hydrogen bond. The calculated results on the geometry and conformation of three compounds are reasonably consistent with those of X-ray and spectroscopic experiments as well as the previous calculations. The orientation of two carbonyl groups of malonyl methyl sulfide is quite similar to that of malonic acid, but different from that of its anion. Especially, the computed probable conformations of the sulfide anion by the three methods are different from each other. The role of hydration seems not to be crucial in stabilizing the overall conformations of malonic acid, hydrogen malonate, malonate, and malonyl methyl sulfide. However, the probable conformations of the unhydrated sulfide anion obtained by the MNDO and AM1 methods become less stabilized by including hydration. The AM1 method seems to be appropriate for conformational study of malonyl-CoA and its model compounds because it does not result in the formation of too strong hydrogen bonds and significant change in conformational energy from one compound to another.
초고성능 콘크리트를 활용한 측구 저류조 개발 및 적용성 분석
김정수,이성호,유인기 융복합지식학회 2022 융복합지식학회논문지 Vol.10 No.4
도심지에서 배수관거의 통수능력 부족으로 인한 월류 및 빗물받이의 배수 기능 상실로 인한 침수피해가 있으므로 침수피해를 저감하기 위한 배수관거 시설 개선에 관한 연구가 필요한 실정이다. 본 연구에서는 배수관거에서의 역류 방지 및 노면수 저류가 가능한 노면수 측구 저류 저류조를 제안하였다. 도로 측구부에 설치되는 측구 저류조의 저류 능력을 향상하기 위해서는 기존 측구 수로보다 단면이 확대되어야 하고 구조적인 안정성의 확보가 필요하다. 따라서 본 연구에서는 측구 저류조의 저류 단면 증대를 위하여 초고성능 콘크리트를 활용을 위한 초고성능 모르타르 경화체의 기초 물성을 평가하였으며, 구조적 안정성을 검토하기 위하여 2차원 구조 해석을수행하였다. 또한, 측구 저류조의 적용성을 확인하기 위하여 실물 크기의 모듈형 측구 저류조를 개발하고 제작하였으며, SWMM을 통한 유출해석을 통하여 측구 저류조의 침수 저감효과를 분석하였다. 초고성능 콘크리트는 품질기준에서 제시한 시험 항목을 모두 만족하였으며, 도출된 실험값을 준용하면 기존 측구 수로관보다 두께가 감소하여 저류 능력을 향상시킬 뿐 아니라 구조적인 안정성도 확보하는 것으로 분석되었다. 또한 제작된 모듈형 측구 저류조는 제작 및 시공성을 충분히 확보하였으며, 실제 도심지에 적용할 경우 약24%의 침수면적이 저감되었다. 그러므로 본 연구에서 개발된 초고성능 콘크리트 측구 저류조는 도심지의 침수 저감을 위한 구조적인 대책으로 적용이 가능할 것으로 판단된다.
노석선,이태현,황성록,유인기,이인호,강상진,류현신,Roh, Seok-Seon,Lee, Tae-Hyun,Hwang, Seong-Lok,Yoo, In-Kee,Lee, In-Ho,Kang, Sang-Jin,Ryu, Hyun-Shin 대한한방안이비인후피부과학회 2007 한방안이비인후피부과학회지 Vol.20 No.1
Objectives ; Sasang Constitional Medicine is a part of Korean traditional Medicine, and classify human constitution into four types. Scalp and hair is a part of skin. Skin is one of constitutional charasteristic element. So we researched a correlation between Sasang constitutions and Korean adult scalp and hair condition. This is a basic study to find constitution can be a important factor to care scalp and hair. Methods ; We examined Sasang constitutions and scalp and hair condition of 80 human who aged from 20-50. Scalp disease, dandruff was observed by video micro scope and sebum tape diagnosis. Thickness of hair was measured by Laser Scan Micrometer(LSM-3100). Itching sense and life habit was also investigated. Constitution diagnosis and scalp, hair diagnosis was investigated seperately as a blind test and the data was statistically analyzed with chi-square test, correlation analysis, one-way analysis of varience. Results ; 1. In Sasang Constitution, Taeumin group had significant tendency of oilily scalp. 70% of Taeumin group had oilily scalp. 2. The group of dry or oilily scalp had more itching sense and more sensativity of scalp compaired to neuter scalp group. 3. There was no correlation between height, weight, thickness of hair, itching sense, scalp disease and Sasang constitution. 4. There was correlation between loss of hair and drinking alcohol, obesity, curly hair, soft scalp. Conclusions ; Korean adult scalp and hair condition had correlation with Sasang constitution.