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강희정,김익천,김진회,손원근,이두식,Kang, Hee-Jung,Kim, Ik-Chun,Kim, Jin-Hoe,Son, Won-Geun,Lee, Du-Sik 대한수의학회 2001 大韓獸醫學會誌 Vol.41 No.4
Microorganisms were isolated and identified from bovine 296 quarters which showed positive reaction by California Mastitis Test (CMT) in 40 farms of Jeju from September 1999 to June 2000. The organisms associated with the mastitis of bovine were 11 different bacterial species in this study. Which of them, Staphylococcus aureus was the most predominant species as 152 (51.4%) isolates. Other identified species included 49 (16.5%) coliform, 47 (15.8%) Streptococcus dysgalactiae, 15 (5.1%) Bacillus spp., 8 (2.7%) Staphylococcus epidermidis, 6 (2.1%) Streptococcus agalactiae, 5 (1.7%) Enterococcus faecalis, 5 (1.7%) Corynebacterium spp., 3 (1.0%) Streptococcus uberis, 1 (0.3%) Pseudomonas aeruginosa and 1 (0.3%) Pasteurella haemolytica. Almost of all the islolated beacterial species showed high sensitivity against kanamycin (98.6%), cephalothin (98.0%), streptomycin (94.9%), gentamicin (94.6%), ampicillin (92.2%) and polymyxin B (90.2%). On the contrary, they showed resistance against penicillin (47.0%), tetracycline (37.2%), cefazolin (26.0%), bacitracin (22.6%) and erythromycin (19.9%). Eighty-one isolates were not resistant to any antibiotics and 215 drug resistant isolates showed 89 different drug resistance patterns from single to nine multiple antibiotics resistance patterns.
강희정(Hee Jung Kang) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.8
본 연구에서는 비정렬 중첩 혼합 격자계를 사용하는 전산유체기법으로 무베어링 로터허브의 공기역학적 항력을 계산하였다. 동체와 로터 허브 모두 점성 항력보다는 압력 항력이 주요 요소로 작용하고 있으며, 토크 튜브의 항력이 허브 항력에서 가장 큰 비중을 차지하고 있음을 확인할 수 있었다. 허브 항력은 동체 항력 대비 39~41%를 차지하는 것으로 나타났다. 최종적으로 개발된 헬리콥터의 항력 추세와의 비교를 통해, 설계된 무베어링로터 허브의 항력은 요구도를 충족시키는 것으로 확인되었다. In this study, aerodynamic drag of a bearingless rotor hub was predicted by computational fluid dynamics methodology using unstructured overset mixed meshes. The calculated results showed that the drag due to pressure forces rather than the viscous drag act as a major factor on both the fuselage and rotor hub, and the drag acting on the torque tube accounted for the largest portion in the hub drag. It was also found the hub drag accounted for 39 ~ 41% of the fuselage drag. Finally, the result confirmed the drag of the designed rotor hub satisfied the requirement of the aerodynamic hub drag by comparing with the drag trend of developed helicopter.
류마티스 관절염에서 항Cyclic Citrullinated Peptide 항체의 진단적 유용성
강희정 ( Hee Jung Kang ),서영일 ( Young Il Seo ),이영경 ( Young Kyung Lee ),조현찬 ( Hyoun Chan Cho ) 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.2
Objective: Rheumatoid arthritis (RA) is the most common rheumatic disease but its diagnosis primarily relies on clinical disease manifestations. The serologic support is restricted to the determination of rheumatoid factor (RF), of which diagnostic ability is far from satisfaction. We compared the usefulness of a new serologic test, anti-cyclic citrullinated peptide antibodies (anti-CCP) for the diagnosis of RA with RF. Methods: Anti-CCP antibodies were determined in 220 serum samples; 134 from RA patients and 86 from controls including 33 healthy controls and 53 patients with other diseases. Of 33 sera of the healthy controls, 12 were RF positive, which were intentionally included for the better analysis of specificities. Anti-CCP was done with the enzyme-linked immunosorbent assay (ELISA). RF was also assayed in every sample, and results were compared to anti-CCP for sensitivity and specificity. Results: On each receiver operating characteristic curve, the area of under the curve was 0.843±0.028 for anti-CCP and 0.741±0.033 for RF. At each optimum cut-off value, the sensitivity of anti-CCP was comparable to that of RF (76.1% vs 67.2%) and the specificity of anti-CCP was better than that of RF (94.2% vs 74.4%, p 0.001). Importantly, 18 of 38 (47.4%) sera from RA patients negative for RF were positive for anti-CCP. Only one of 12 sera from healthy controls positive for RF was positive for anti-CCP. Conclusion: The anti-CCP ELISA showed high sensitivity even in RF negative RA patients, and very high specificity in healthy controls and disease control groups. The anti-CCP ELISA appeared a very useful new diagnostic test for RA.