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[1984년도 춘계총회 및 학술발표회 행사진행 및 발표논문요지] 흠함을 갖는 불연속 평판구조물의 안정성 연구
김시영,이선우,홍봉기 한국수산학회 1984 한국수산과학회지 Vol.17 No.3
木 論文은 不連續 平板構造物 그內部에 欠陷을 가질때 千涉에 依한 安定性 問題의 評價에 대해서 硏究한 바를 報告한다. 여기에 關係하는 종래의 硏究들은 대개 平滑平板等의 連續構造物 內部에 어떤 종류의 欠陷이 存在하여 그 附近에 局所的으로 降伏點을 초월하는 경우에 그 破壞要因인 許容限界應力評價를 爲하여 그 支配特性 媒介變數인 K値, COD, J積分値等이 報告되어 있으나 이들은 欠陷部의 境界가 압축을 받을때 그 部分에서는 全體變形및 J積分의 經路의 獨立性이 問題가 되고 또 精度面에서도 만족치 못하다. 그런데 特히 變位가 없는 접촉境界面에서 適用解析方法이 容易하며 大形高速電子 計算機 利用方法의 하나이고 精度가 뛰어난 BEM(境界要素法)으로 그 特性値를 구했다. 이를 檢定하기 爲하여 光彈性實驗을 병행하여 確認하고 또 지금까지 보고된 COD, J積分値의 式들을 壓縮이 아닌 境界部分에서 修正하여 그 計算例를 BEM 및 실험치와 비교하였다. 그리고 本實驗에 사용된 시험편은 RJ series이며 平面內에 壓縮分布荷重이 作用할때의 欠陷附近의 그 特性値들을 比較檢討하였다.
ZnO를 이용한 GaN 자립형 기판의 제작에 관한 연구
김시영,정미나,이삼녕,장지호,이현재,Katsushi Fujii,Takenari Goto,Takafumi Yao,박승환,이웅,Takashi Sekiguchi 한국물리학회 2010 새물리 Vol.60 No.4
A new hydride vapor phase epitaxy (HVPE)-based approach to the fabrication of freestanding GaN (FS-GaN) substrates was investigated. For the direct formation of low-temperature GaN (LT-GaN) layers, the growth parameters (the polarity of ZnO, the growth temperature, and the V/III ratio) were optimized. The FS-GaN layer was achieved by gas etching (900℃, NH₃) in an HVPE reactor. The fabrication of a thin (80 ㎛) FS-GaN film on a FS-GaN (LT) seed substrate to improve the quality further is discussed. 간단한 공정을 이용한 자립형 GaN 기판 제작을 위하여 PAMBE(Plasma Assisted Molecular Beam Epitaxy)법으로 성장한 ZnO 희생층 상에, HVPE(Hydride Vapor Phase Epitaxy)법으로 GaN를 직접 성장하고, HVPE 반응로 안에서 기상 식각을 시도하여 GaN와 사파이어 기판을 분리하고 그 위에 고온에서 GaN 후막을 재 성장하는 방법을 제안하였다. ZnO-희생층 상에 저온 GaN를 직접 성장하기 위해서, ZnO-희생층의 극성, GaN의 성장 온도 및 V/III ratio를 최적화하였고, 설정된 조건에서 성장한 저온 GaN와 사파이어 기판을 고온 가스 식각을 (900℃, NH₃) 통하여 분리하였으며, 그위에 80 ㎛의 두께를 가지는 자립형 GaN 기판을 제작하여 결정성을 고찰 하였다.
김시영,송유리,이현아,나희삼,정진 대한예방치과·구강보건학회 2022 大韓口腔保健學會誌 Vol.46 No.3
Objectives: Oral streptococci play a significant role in the development of dental caries. Among them, Streptococcus mutans and Streptococcus sobrinus are the principal causative agents of dental caries. Rheum palmatum is a flowering plant of the family Polygonaceae with several known medicinal properties. However, its effects on oral streptococci have yet to be established. Therefore, we investigated the effects of Rheum palmatum for its potential use as an anticaries agent in inhibiting the growth of streptococci and preventing biofilm formation. Methods: Rheum palmatum extract was diluted with sterile distilled water to obtain various extract concentrations. Several strains of oral bacteria, including S. mutans and S. sobrinus , were treated with the varying concentrations. The effects of the extract on bacterial growth was examined using the viable cell count method. Glucan synthesis was measured using a spectrophotometer at 650 nm optical density. Crystal violet staining was also carried out to observe the effect of the extract on biofilm formation. Results: The growth of S. mutans and S. sobrinus was significantly inhibited by the Rheum palmatum solution at concentrations of 0.3% or more compared to the control group. The viable cell count results indicated that the number of bacterial colonies decreased 1.2-fold and 1.7-fold at concentrations of 1.25% and 2.5%, respectively, compared to the control group. Biofilm formation by S. mutans and S. sobrinus was suppressed more than 20-fold compared to the control group at extract concentrations of 1.25% or more. Conclusions: The extract inhibited the growth of caries-causing bacteria, namely S. mutans and S. sobrinus . Furthermore, the extract inhibited the synthesis of glucan and biofilm formation by S. mutans and S. sobrinus . Therefore, this study suggests that the extract is a potential candidate as a therapeutic agent for controlling dental caries.
김시영,김태형,이동호,이상목,김정훈,조경삼,장영운,윤휘중,박용구,이주희,김명임 대한내과학회 2001 대한내과학회지 Vol.60 No.3
$quot;Primary non-Hodgkin's lymphoma of the liver, an organ normally devoid of a native lymphoid tissue, is very rare. We report a case of primary hepatic T-cell lymphoma in a 18-year-old girl, with review of literature. The pateint admitted with fever for 5 months. The ultrasonography revealed a 10 × 7 cm sized mass in the left lobe of the liver. On abdominal CT, the mass was poorly enhancing and low attenuated. On MRI, the signal intensity of the mass was low in T1 weighted image, heterogeneously high in T2 weighted image, and peripherally enhanced in contrast enhancing T1 weighted image. The biopsy specimen obtained by laparatomy showed anaplastic tumor. The malignant cells were positive for T-cell lineage (CD3, CD44, CD45RO). There was no evidence of the lymphoma in other regions. The patient was treated with CHOP (cyclophosphamide, adriamycin, vincristine and prednisolone) chemotherapy without objective response. The patient died of sudden cardiogenic shock.(Korean J Med 60:260-265, 2001)$quot;