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기계화학반응에 의한 TiN/TiB<sub>2</sub>/Ti-silicides 나노복합분말의 합성과 반응기구
조영환,김지우,심재혁,안재평,오규환,Cho Young-Whan,Kim Ji-Woo,Shim Jae-Hyeok,Ahn Jae-Pyoung,Oh Kyu-Hwan 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
Nanostructured TiN/$TiB_2$/$TiSi_2$ and TiN/$TiB_2$/$Ti_5Si_2$ composite powders have been prepared by mechanochemical reaction from mixtures of Ti, BN, and $Si_3N_4$ powders. The raw materials have reacted to form a uniform mixture of TiN, $TiB_2$ and $TiSi_2$ or $Ti_5Si_3$ depending on the amount of $Si_3N_4$ used in the starting mixtures, and the reaction proceeded through so-called mechanically activated self-sustaining reaction (MSR). Fine TiN and $TiB_2$ crystallites less than a few tens of nanometer were homogeneously dispersed in the amorphous $TiSi_2$ or $Ti_5Si_3$ matrix after milling for 12 hours. These amorphous matrices became crystalline phases after annealing at high temperatures as expected, but the original microstructure did not change significantly.
조영환 ( Young Whan Cho ),김경조 ( Kyung Jo Kim ),예병덕 ( Byong Duk Ye ),변정식 ( Jeong Sik Byeon ),명승재 ( Seung Jae Myung ),양석균 ( Suk Kyun Yang ),김진호 ( Jin Ho Kim ) 대한소화기학회 2012 대한소화기학회지 Vol.60 No.6
Perivascular epithelioid cell tumor (PEComa) is extremely rare, which originated from mesenchymal cells in the intestine, and composed of histologically and immunohistochemically distinctive perivascular epithelioid cells. We report here on a case of PEComa in the sigmoid colon. A 62-year-old woman presented with hematochzia 10 days ago. Her abdominal computed tomography scan showed a 5 cm sized intraluminal fungating heterogeneously enhanced, high density mass, which infiltrated pericolic tissue surrounding the sigmoid colon. Colonoscopy showed a purple colored polypoid mass with lobulating contour in the sigmoid colon. She underwent laparoscopic anterior resection. On the histologic examination, the tumor consisted of polygonal epithelioid cells with sheet-like growth of nests, which looked like alveolar tissues in lung. The tumor cells were strongly positive stained with human melanoma black-45 (HMB-45). Pathologic examination was compatible with PEComa. Sixteen months after surgery, she did well without tumor recurrence after surgery. We review the literatures concerning PEComa of the intestine focusing on endoscopic findings.
노영수(Young Soo Rho),홍남두(Nam Doo Hong),조영환(Young Whan Cho) 한국생약학회 1985 생약학회지 Vol.16 No.2
These studies were conducted to investigate the effect of Inchungbaek water extract on analgesic and sedative actions, the relaxing action of isolated ileums, vasodilating action and blood pressure. The results of these studies were summarized as follows: Analgesic and sedative actions of Inchungbaek were recognized in mice and rats. The relaxing action of isolated ileums were seen in mice and rabbits, antagonist action was seen acetylcholine and BaCl₂-induced contraction of isolated ileums, and then recognized direct action in the ileum smooth muscle. Hypotensive and vasodilating actions due to vascular smooth muscle relaxation were noted in rabbits and cats.
생약의 수치(修治)에 따른 약호연구(제2보) : 지모(知母)의 진정, 수면효과 및 장관평활근에 미치는 영향
설수용,조영환,노영수,홍남두,김신규,Sul, Soo-Young,Cho, Young-Whan,Rho, Young-Soo,Hong, Nam-Doo,Kim, Sin-Kyu 한국약제학회 1986 Journal of Pharmaceutical Investigation Vol.16 No.1
Anemarrhenae Rhizoma has been clinically used as a sedative drug in oriental medicine. We observed the sedative action and effect on the movement of isolated-ileum with each water extract of Anemarrhenae Rhizoma (F-I), saline solution treated preparation (F-II) and 25% ethanol treated preparation (F-III). The results obtained were summerized as follows; 1) Sedative actions were recognized with F-I, F-II and F-III. 2) Prolonged effect of sleeping time was recognized significantly with F-I, F-II and F-III. 3) Each fraction of Anemarrhenae Rhizoma showed the released action on the isolated-ileum of the mouse, rat, rabbit and guinea pig, and antagonic action against contraction induced by acetylcholine, barium chloride and histamine. Thus the mechanism in the released action of the smooth muscle was partly considered as the direct dependence of the smooth muscle.
서동일(Dong-Il Seo),조영환(Young-Hwan Cho),김성환(Seong-Whan Kim),이흥규(Heung-Kyu Lee) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1A
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