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Fluoxymesterone, $C_{20}H_{29}FO_3$의 결정구조
김의성,박권일,조성일,Kim, Ui-Seong,Park, Gwon-Il,Jo, Seong-Il 한국결정학회 1993 韓國結晶學會誌 Vol.4 No.1
11 β ,17 β -dihydroxy-9a-fluoro-l7a-methyl androst-4-en-3-one (Fluoxymesterone), CgoH29 FO,, orthorhombic, P2,2,2,, a=13.468(5) A, b= 19.554 (2)A, c=6.578(9)A, a=b=r=90˚, A (CuKa)=1.5406 A , Dm=1.289cm-3, Dc=1.299cm-3 and Z=4 at T=298k. The structure was solved by direct method using seminvariants of ggg Parity group and refined by the full-matrix least-square method, resulting model with reliability factor R=0.069 for 1098 unique reflection over 3σ . Ring A is an 1β-2a-half chair, 5 ring has a highly symmetrical chair conformation, C ring is in a distorted chair conformation and D ring is a 13aenveLope conformation. In the crystal structure, the molecules are packed with a hydrogen bond of 011-H23‥‥03(0.5+x, 1.5-y, 1.0-z) [1.94(9) A of H‥‥0.2.786(9)A of 0‥‥0 and 165(8) ˚ of <O-H 0] and van der Waals forces. 플루옥시메스테론, CtoHagF03, 정방정계, 공간군 P2l 2,2,, T=298k에서, a=13.468(5)A , b=19.554(2)A, c=6.578(9)A, a=b=r=90˚, A(Cu-Ka)=1.5406A, Dm의.289cm-3, Dc= 299cm-3,2 구조는 ggg Parity군에 속하는 반불변수를 사용하는 직접법으로 해석 하였으며, 완전행렬 최소자숭법으로 정밀화하여 3σ 이상인 1098개의 독특한 회절반점에 대하여 최종 신뢰도 인자 R=0.062인 분자모형을 구하였다. A고리는 1β-2a a-반 의자형, B묘고리는 대칭성이 좋은 의자형, C고리는 약간 찌그러진 의자형 이며, D고리는 13u-envelope 형 태이다. 결정구조에서, 분자들은 011-H2로·.0대0.5+ x,1.5-y,1.0-2) [H‥‥0의 1.94(9),40·.0의 2.786(9) A 및 LO-H‥‥0의 165(8) ˚ ] 의 수소결합과 van der Waals 힘으로 채워져 있다.
김의성,Kim, Ui-Seong 한국건설안전협회 2009 建設 安全技術 Vol.49 No.-
By bond mechanism between the prestressing strand and the concrete surrounding it, the effective force of prestressing must be transferred to the concrete entirely. The distance required to transfer the effective force of prestressing is called the transfer length, and the development length is the bond length required to anchor the strand as it resists external loads on the member. Transfer length was determined from the concrete strain profile at the level of the strands at transfer and development length was determined from various external loading lengths and compared with current code equation. Through the test results, bond failure is predicted based on the distress caused by cracks when they propagate within the transfer zone of prestressing strand. The current code equation was found to be conservative in comparison with the measured value.
지연된 의도적 재식술을 통한 치주 조직 재생 방법의 고찰
김유경(You-Kyoung Kim),김동주(Dong-Ju Kim),이은웅(Eun-Ung Lee),임현창(Hyun-Chang Lim),이중석(Jung-Seok Lee),정의원(Ui-Won Jung),윤정호(Jeong-Ho Yun),김의성(Eui-Seong Kim),이승종(Seong-Jong Lee),최성호(Seong-Ho Choi) 대한치과의사협회 2015 대한치과의사협회지 Vol.53 No.7
Purpose: Delayed intentional replantation was introduced as a new alternative to treat the teeth with severe periodontal involvement. The purpose of this study was to elucidate the possibility of delayed intentional replantation and establish theoretical backgrounds. Materials and Methods: Studies were performed into the following two subjects; ① Clinical evaluation of patients who underwent delayed intentional replantation using clinical and radiographic data. Severe periodontitis involved teeth were carefully extracted and proper time for delayed replantation was evaluated by analyzing inflammation markers (IL 6, TNF α). ② Theoretical studies for efficacy of delayed intentional replantation using ( ) Epigallocatechin 3 gallate (EGCG) for preservation of periodontal ligament cells on root surface by minimizing inflammation and treatment of inflammatory extraction sockets. Results: Meaningful success ratio and survival rate were found in delayed intentional replantation showing reduced bone loss and maintained bone level. Additionally, viability of EGCG applied periodontal ligament cells was much higher than control group. Also, EGCG promoted healing of inflammatory extraction sockets by inhibiting inflammatory cell proliferation. Conclusion: Within the limitations of this study, 1 2 weeks after extraction is an appropriate time to do delayed intentional replantation. Also, EGCG provides helpful effects on viability of periodontal ligament cells and periodontium.