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오인석(In Seok Oh),인세진(Se Jin In),최돈묵(Don Mook Choi),이영석(Young Seak Lee),김정일(Jung Il Kim),주혁종(Hyeok Jong Joo) 대한공업교육학회 2000 대한공업교육학회지 Vol.25 No.1
The 4D preforms were made of both weaving and rod network types. Densified 4D CFRC was fabricated with coal tar pitch matrix through the process of pressure impregnation and carbonization(PIC). Each preform type was compared with combustion and thermal properties of 4D CFRC and investigated. In case the high heat treatment was up to 2300℃, the oxidation resistance of 4D CFRC was much increased. As a result of combustion test, the ablation resistance of 4D CFRC rose with the growing of density and heat treatment temperature(HTT). Therefore, to obtain better ablation resistance under the worse conditions such as high temperature, high HTT and densification are essential parameters.
MR Imaging in a Child with Scurvy: a Case Report
Seung Woo Choi,Sun-Won Park,Young Se Kwon,오인석,Myung Kwan Lim,Won Hong Kim,Chang Hae Suh 대한영상의학회 2007 Korean Journal of Radiology Vol.8 No.5
Scurvy is very rare disease in industrialized societies. Nevertheless, it still exists in higher risk groups including economically disadvantaged populations with poor nutrition, such as the elderly and chronic alcoholics. The incidence of scurvy in the pediatric population is very low. This study reports a case of scurvy in a 5-year-old girl with cerebral palsy and developmental delay based on MRI findings.
정승주(Seung-Ju Jeong),여진기(Jin-Ki Yeo),오인석(In-Seok Oh),성세진(Se-Jin Seong) 전력전자학회 1996 전력전자학술대회 논문집 Vol.1996 No.-
A Switched Reluctance Motor(SRM) has a torque pulsating inherently due to characteristics of pulse driving. A torque pulsating causes noise and sound vibration. To reduce a noise, a torque pulsating shall be controlled Many efforts to make flat-topped current has been proposed to minimize a torque pulsating up to now. This paper proposed a control scheme to minimize the vibration of SRM by controlling the vibration directly by using of self-tunning technique The experimental results show that the proposed control scheme is effective in reducing the torque ripple and noise.
자속 모델 기준 추종방식을 이용한 SRM 회전자 위치평가알고리즘 비교
최재동(Jae-dong Choi),안재황(Jae-hwang An),황영성(Young-seong Hwang),성세진(Se-jin Seong),오인석(In-seok Oh) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper introduces a new rotor position estimation algorithm for the SRM, based on the magnetizing curves of aligned and unaligned rotor positions The flux linkage is calculated by the measured data from phase voltage and phase current, and the calculated data are used as the input of magnetizing profiles for rotor position detection. Each of the magnetizing profiles consisted of the methods using the neural network and fuzzy algorithm.<br/> And also, the optimal phase is selected by phase selector. To demonstrate the promise of this approach, the proposed rotor position estimation algorithms are verified by the experiment results for variable speed range