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Min, Kyeongsik,Kim, Sun Young,Song, Hyun Kyu,Chang, Changsoo,Cho, Seung-Je,Moon, Jinho,Yang, Jin Kuk,Lee, Jae Young,Lee, Kong-Joo,Suh, Se Won 梨花女子大學校 藥學硏究所 2000 藥學硏究論文集 Vol.- No.9
Human nucleoside diphosphate kinase A catalyzes phosphoryl transfer and acts as a suppressor of metastasis. It has been crystallized using 2-methyl-2,4-pentanediol as a precipitant at 288 K. The crystal is monoclinic, belonging to the space group P2_1, with unit-cell parameters a = 74.21. b = 78.11, c = 82.29 Å, β = 101.33°. The asymmetric unit contains a homohexamer. with a corresponding crystal volume per protein mass (V_m) of 2.27 Å^3 Da^-1 and a solvent content of 46%. Native X-ray data to 2.15 Å resolution have been collected using synchrotron X-rays.
복합재 구조물의 저속 충격 손상 및 충격 후 압축 강도 해석
서영욱(Young W. Suh),우경식(Kyeongsik Woo),최익현(Ik-Hyun Choi),김근택(Keun-Taek Kim),안석민(Seok-Min Ahn) 한국항공우주연구원 2011 항공우주기술 Vol.10 No.1
최근 항공기의 성능향상 및 경량화 등의 필요에 의해 많은 항공기 특히 소형항공기 구조물에 있어 복합재료의 사용이 증가되고 있다. 그러나 복합재료의 복잡한 기계적 거동 특성 및 파손양상 등으로 인하여 그 사용에는 많은 제한이 따르고 있는 실정이다. 복합재에 발생하는 저속충격은 외관상 드러나지는 않기 때문에 복합재 구조물을 설계하는 데 있어 매우 중요하며, 특히 충격 후 충격손상으로 야기되는 층간 분리등은 구조물의 압축강도를 현저하게 저하시킬 수 있다. 본 연구에서는 적층복합재 구조물의 저속충격에 의한 손상거동 및 충격 후 잔류압축강도를 수치적으로 예측하였다. 예측 된 충격하중 이력곡선과 충격 후의 압축 강도를 시험결과와 비교하였고 잘 일치함을 확인 할 수 있었다. The demand for weight saving and high performance of aircraft require the more uses of composite materials. However the complicate behaviors and various failure characteristics restrict usage of composite materials. Low-velocity impact damage is a major concern in the design of structures made of composite materials, because impact damage is hidden and cannot be detected by visual inspection. Especially, the reduction on compressive strength after impact is influenced by the ply delaminations introduced as damage by impact event. In this research, the numerical analysis was performed to investigate impact damage and compressive strength after impact. It was found that impact force history and compressive strength after impact calculated by the numerical analysis were compared and shown a good agreement with experimental results.
SUH, YOO-HUN,CHONG, YOUNG HAE,KIM, SEONG-HUN,CHOI, WOONG,MIN, KYEONGSIK,JEONG, SUNG-JIN,FRASER, S. P.,DJAMGOZ, M. B. A. 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-
APP may be associated with defense mechanisms in the central nervous system involving the immune system.^1 The finding of low levels of APP was initially described in proportion to lymphocytes.^2 We examined APP expression in human lymphocytes and spleen and compared APP expression in lymphocytes from Alzheimer's patients to that in lymphocytes from age-matched controls. In spleen, the majority of cells showing A? immunoreactivity was found in the T cell-dependent zone. Fluorescence activated cell sort analysis(FACS) indicated that around 90% of CD4^+ T cells and 60% of CD8^+ T cells were immunoreactive to A? specific monoclonal antibody (mAb) 4G8. Northern blot analysis showed that lymphocyte APP mRNA was gradually increased to reach a maximum at 3 days
( Noori Lee ),( Dong Hoon Lee ),( Jung Hoon Lee ),( Kyeongsik Min ),( Sung Yun Kang ),( Seungkil Seo ),( Byung Lae Rho ),( Wonho Kim ) 한국고무학회 2015 엘라스토머 및 콤포지트 Vol.50 No.2
In this study, epoxy/anhydride mixing ratio for the highly silica filled compounds with chromium (III) octoate catalyst was investigated at a low curing temperature (71°C for 40 hr) by evaluating the compressive strength with the weight ratio ranges from 0.3/1.0 to 1.0/1.0 of epoxy part (Part A)/anhydride part (Part B). In case of epoxy/anhydride compounds used surface unmodified silica by coupling agent, these compounds need excess anhydride unlike the weight ratio in the conventional epoxy/anhydride compounds. In curing behavior, the epoxy/anhydride compounds containing chromium (III) octoate showed high conversions at 71°C for 40 hr, even if a dipropylene glycol (DPG) was not used as a polymerization initiator. Also, DPG leads to a poor epoxy network structure. In conclusion, the appropriate weight ratio of Part A/Part B of highly silica filled epoxy/anhydride compounds with chromium (III) octoate catalyst is 0.5/1.0 and the maximum amounts of silica is 1470 phr of epoxy resin.