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1980년(年) 한국(韓國)에서 분리(分離)된 Vibrio cholerae에 관(關)한 연구(硏究)
정태화 ( T. H. Chung ),조민기 ( M. K. Cho ),정은주 ( E. J. Chung ),윤승기 ( S. K. Yun ) 대한임상검사과학회 1982 대한임상검사과학회지(KJCLS) Vol.14 No.1
An Investigation was carried out for determination of biological characteristics of Vibrio cholerae isolated in Korea in 1980. The results were summarized as follows: 1. All cultures isolated were identified as Vibrio cholerae 01 biotype eltor, serotype Inaba, and showed typical biochemical properties. 2. The isolates had same agglutination titer against reference antisera as that of referance stran. 3. LD50 of isolates in mice were 8~23 organisms. 4. In antimicrobial susceptibility testing by Kirby-Bauer disc method , Over 90% of cultures were sensitive to tetracycline, gantrisin, chloramphenicol, gentamicin and nalidixic acid.
정은주,최성민,오세철,정윤중 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
Silicon nitride composites reinforced with 0∼40 vol% silicon carbide particle were prepared by hot pressing under 30 MPa for 60 min in flowing nitrogen atmosphere. The range of sintering temperature was between 1750 to 1850℃ The effects of silicon carbide particle dispersoids on fracture toughness and fIexural strength of silicon nitride based composites were investigated Fully densed silicon carbide reinforced silicon nitride composites were obtained up to 20 vol% particle at 1850℃. Flexural strengths were less than that of Si₃N₄ monolith, and showed a maximum value(911 MPa) at 20 vol%. Hardness increased with silicon carbide particle content up to 40 vol%, and showed a maximum value (18.9 GPa) at 40 vol%. Fracture toughness had the tendecy to increase with silicon carbide particle content up to 20 vol%, and showed a maximum value (6.9 MPam1/2) at 10 vol%. Fracture toughness was improved by crack branching crack deletion and crack bridging mechanism.