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Development of Noise Source Detection System using Array Microphone in Power Plant Equipment
손석만,김동환,이욱륜,구재량,홍진표,Sohn, Seok-Man,Kim, Dong-Hwan,Lee, Wook-Ryun,Koo, Jae-Raeyang,Hong, Jin-Pyo Korea Electric Power Corporation 2015 KEPCO Journal on electric power and energy Vol.1 No.1
In this study, it has been initiated to investigate the specific abnormal vibration signal that has been captured in the power equipment. Array Microphone can be used in order to detect the direction and the position of the noise source. It is possible to track the abnormal mechanical noise in the power plant by utilizing the program and the microphone array system developed from this research. Array microphone system can be operated as a constant monitoring system.
발전소내 긴 밸브 stem을 갖는 옥외 소화전의 파손 현상 규명
손석만(Sohn Seok-Man),이상국(Lee Sang-Guk),이욱륜(Lee Wook-Ryun),이준신(Lee Jun-Shin),김기태(Kim Ki-Tae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Nuclear power plant has many external fire hydrants that have to operate in the state of emergency such as facility fire, forest fire. The valve stem of one among them was broken 3 times for 4 years. It had long valve stem and operated under high water pressure. The elongation and the tensile strength for the broken valve stem was measured to examine the defect of material property. And the vibration level and the natural frequencies was detected to check the resonance. As the result of a diagnosis, the cause of this fault is proven buckling of long valve stem.
차량진동에 대한 안정거울장치의 성능향상을 위한 강건설계 및 공차할당
이종원,정호섭,손석만,Lee, Chong-Won,Jeong, Ho-Seop,Sohn, Seok-Man 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
In this paper, the robust design and tolerancing of the stabilized mirror is performed to increase its stabilization performance under vehicle vibration. Based on the sensitivity analysis, the seven important control factors are first identified, and then the optimal as well as robust values in the sense of Taguchi method are obtained. Finally, the tolerances associated with each design variables are determined based on a successive sensitivity analysis of the simulated system response so that the deviation in the response from the target value meets the specification requirements. The proposed tolerancing method features that it is a robust but conservative design method and that the computational effort is much less than the Monte Carlo simulation method.
이상수 ( Sang Soo Lee ),손우석 ( Woo Seok Sohn ),박한뫼 ( Han Moie Park ),김용만 ( Young Man Kim ),목정은 ( Jung Eun Mok ) 대한산부인과학회 2005 Obstetrics & Gynecology Science Vol.48 No.3
목적: 본 연구의 목적은 향후 세포 면역치료시 사용할 수 있는 T 림프구를 제대혈로부터 분리하여 체외 배양하는데 필요한 최적 조건을 확립하기 위하여, 기존에 사용하던 FBS와 자가 제대혈장 (autologous cord blood plasma, ACBP), 동종 제대혈장 (homologous cord blood plasma, HCBP)을 각각 T 림프구 체외 배양 배지의 영양공급원으로 사용하여, T 림프구의 증폭, 증폭 전후의 T 림프구의 면역학적 특성 Objective: The objective of this study was to establish a clinically applicable culture system by investigating the use of autologous cord blood plasma (ACBP) instead of fetal bovine serum (FBS) for the ex vivo expansion of umbilical cord blood (UCB) T-ly