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원전 조기경보 시스템의 신뢰성 향상을 위한 패턴모델 및 고장판정 조건의 최적화
민지호(Ji Ho Min),김대웅(Dae-Woong Kim),김양석(Yang-Seok Kim),이병오(Byoung-Oh Lee),박치용(Chi-Yong Park) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.1
본 논문에서는 원전 조기경보 시스템의 신뢰성 향상을 위해 수행한 내역에 관해 기술한다. 기 구축된 데이터 특성 기반의 시스템을 설비의 특성과 전문가의 경험을 반영하여 최적화함으로써, 시스템의 성능과 신뢰성을 향상시켰다. 최적화 과정은 크게 두 가지로 분류되는데, 먼저 시스템의 예측성능을 향상시키기 위해 패턴모델을 최적화한 후 오경보 발생을 예방하기 위해 경보 발생을 결정하는 고장판정 조건을 최적화하였다. 수행결과 시스템의 예측성능과 경보 신뢰성이 크게 향상되어, 제안된 방법이 효과적인 것을 확인하였다. In this study, an enhancement of reliability in early warning system for NPPs is carried out. Previous early warning system adopts a data-driven approach which does not consider equipment characteristics and expert know-how. To overcome this weakness and improve the reliability, two methods of system optimization are performed. First, to improve the estimation ability of the signals, pattern models are optimized. Second, important parameters that determine fault decision rule are optimized to evade false warnings. The results show that the reliability of system is greatly improved and confirm the effectiveness of proposed approach.
신혜경,민지호,정용식,Shin, Hye-Kyung,Min, Ji-Ho,Chung, Yong-Sik 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.2
Antimicrobial acitivity of chitosan fiber was reinforced by N-halamine which is a compound containing nitrogen-chlorine covalent bond that is formed by halogenation of amine in chitosan. Upon pH and chlorination time of sodium hypochlorite solution, aminogroup in chitosan fiber was differnetly chlorinated according to respective conditions. The chlorination of chitosan fiber was confirmed by iodometric titration. The results obtained are following: longer reaction time caused the chlorination of chitosan fibers to increase, and acidic conditions during the treatemnt was more effective compared to alkaline or neutral conditions. The chlorinated chitosan fibers showed powerful antimicrobial activity against both E. coli and S. aureus. SEM observations demonstrated that the chlorinated chitosan fibers were not damaged under the acidic treatment condition.
펌프 기동 및 정지에 따른 배관 압력상승과 수격작용 영향 고찰
허민웅,민지호,Heo, Min Woong,Min, Ji Ho 한국압력기기공학회 2017 한국압력기기공학회 논문집 Vol.13 No.1
In the fire protection system or fire fighting water supply system, the jockey pump is generally installed for the prevention of the pressure decrease of pipes, the frequent driving of the fire pump and protection the pipes from the water hammer. In this paper, the pressure-rise in fire fighting water distribution pipes in condition of pipe pressurization by the surge tank at the start-up and the sudden-stop of the fire pump without additional installation of jockey pump is considered by using simple formula calculations and the evaluation of water hammer occurrence in condition of pipe pressurization by the surge tank is included. As a result, the pressure-rise of pipes is less than the pipe design pressure at the condition of pump's start-up and sudden stop, and the possibility of water hammer occurrence is remarkably low due to pressurization of the pipes by the surge tank.
구제요법으로 시행한 소라페닙 치료에 극적인 반응을 보인 폐전이를 동반한 진행성 간세포암종 1예
김대하 ( Dae-ha Kim ),민지호 ( Gee Ho Min ),이동원 ( Dong-won Lee ),안계련 ( Ke Ryun Ahn ),김지혜 ( Ji Hye Kim ),서상준 ( Sang-jun Suh ),정영걸 ( Young Kul Jung ),임형준 ( Hyung Joon Yim ) 대한간암학회 2016 대한간암학회지 Vol.16 No.1
Sorafenib is a multi-targeted tyrosine kinase inhibitor that inhibits Raf kinase and the vascular endothelial growth factor receptor intracellular kinase pathway and is the first agent to demonstrate a statistically significant improvement in overall survival for patients with advanced hepatocellular carcinoma (HCC). However, there were few cases of partial or complete response reported in the previous studies. We herein report a case of dramatic partial response in a patient who had advanced HCC with multiple lung metastasis and portal vein thrombosis treated with sorafenib. (J Liver Cancer 2016;16:57-62)