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회전체 진동 감소를 위한 마그네틱 댐퍼의 설계 및 응용
김영배,이형복,이봉기,Kim, Young-Bae,Yi, Hyeong-Bok,Lee, Bong-Ki 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
In this study, active control magnetic actuator for reducing vibration of rotor system is performed. Identification, modeling, simulation, control system design, and evaluation of active magnetic damper system have been researched. Power amplifier modeling, connected magnetic actuator and augmented by system identification, is included to establish a magnetic damper simulation which provides close performance correspondence to the physical plant. A magnetic actuator, digital controller using DSP(Digital Signal Processor), and bipolar operational power supply/amplifiers are developed to show the effectiveness of reducing rotor vibration. Also the curve fitting procedure to obtain the transfer function of frequency dependent components is developed. Two kinds of test are executed as sliding and oil bearing. Results presented in this paper will provide a well-defined technical parameters in designing magnetic damper system for the proposed rotor.
김영배,Kim, Yeong-Bae 한국화재보험협회 1991 방재기술 Vol.10 No.-
It seems that the use of one of the major fire-fighting agents-halon-is going to be denied to the fire protection community at the end of the century. It is now being widely accepted that the CFC and halons released into the atomosphere are contributing to both the depletion of the ozone layer green house effect. Therefore, we should research to determine suitable alternative(gaseous) fire extinguishings agents to the halons and improve or develop other extinguishing systems.
김영배,한원남,유태종,Kim, Young-Bae,Han, Won-Nam,Yoo, Tai-Jong 한국식품과학회 1985 한국식품과학회지 Vol.17 No.5
$28^{\circ}{\pm}2^{\circ}C$에서 24주 동안 저장한 쌀은 대조구및 곰팡이를 접종한 경우에는 수분항량이 각각 13.7%$\sim$14.1%로서 곰팡이의 생장은 보이지 않았다. 바구미가 존재할 경우에는 , n-hexanal 함량도 대조구및 곰팡이구에 비하여 현격한 차이를 나타내며 변화하였다. Polished rice was stored for 24 weeks at $28^{\c수분함량이 16.0% after infestation with rice weevil (Sitophilus oryzae), inoculation with a storage mold, or both treatment. The moisture contents of stored rice with and without rice weevil were 16.6%-17.3% and 13.70%-14.1% respeotively. Fungal numbers were $4.3{\times}10^{6}$/g to $7.2{\times}10^{6}$/g with insects while no fungal growth occurred without them. There were considerable differences between rice weevil infested- and non-infested rice in rice kernel hardness, 1000 kernel weight, maximum viscosity on amylogram, reducing sugar content, fat acidity, and n-hexanal content in head space gas.