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부검 실무에서 사후 검체를 이용한 C-반응단백질 검사에 대한 연구
오연호,함석훈,박정우,김형석,박종태,나주영 대한법의학회 2016 대한법의학회지 Vol.40 No.1
C-Reactive protein (CRP) is an acute phase response protein synthesized in the liver as a response to various inflammation. CRP is extensively used as a general marker for inflammation in clinical medicine. A forensic applications of the CRP using postmortem samples have been studied in oversea. We have compared CRP in the between antemortem and postmortem samples and studied stability of postmortem blood samples for CRP test. In 69 consecutive autopsy cases, we have analysed heart blood samples (69 cases), peripheral blood samples (33 cases), and vitreous humor samples (60 cases). Postmortem CRP was elevated in 25 cases (36.2%) and possible causes of CRP elevation were inflammatory disease except one case (unknown). Postmortem CRP test shows sensitivity 86.7%, specificity 80%, positive predictive value 92.9%, and negative predictive value 66.7% for inflammation based on 20 cases with antemortem CRP results. The postmortem CRP levels were similar in the heart blood samples and peripheral blood samples. Vitreous humor samples are not useful in postmortem CRP testing. And both whole blood and serum samples are stable in room temperature until 31 days. We conclude that serum from heart blood is best suitable sample for postmortem CRP test and postmortem CRP test is useful in routine autopsy practice to detect inflammatory disease such as sepsis. From the view of postmortem point, we desire that this valuable test should be used in routine autopsy practice in Korea.
Prediction of Insulation Capability for Ground Fault to Consider Asymmetry in SF6 Circuit Breaker
오연호,송기동,김홍규,이해준,한성진 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.5
Currently, most high-voltage gas circuit breakers (CBs) include asymmetrical geometries in the shield, the tank, the hot-gas exhaust, and the connection parts for bushings. For this reason, a 3-dimensional (3-D) analysis of the insulation capability is necessary, rather than a 2-D analysis. However, a 3-D analysis has difficulties due to the computational time and complex modeling. This paper presents a 3-D analysis considering the asymmetry in high-voltage gas CBs and a technique to reduce the calculation time. In the proposed technique, the arc plasma requiring the most computational time is first calculated by a 2-D analysis. Then, the results such as pressure, temperature, and velocity are input as a source for the 3-D analysis. This technique is applied to a 145kV self-blast-type CB and the analysis result exhibits good agreement with the experimental result.
오연호,한성진,주수원 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2
This paper deals with finite element analysis of small motors using permanent field magnets. To improve the computational accuracy, adaptive finite element algorithm is applied and that estimates the normal directional magnetic field densities at the interfaces of neighboring meshes. Results show the flux distribution to be smoothen and the calculated torque to be improved.