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작동중인 모스 전계 효과 트랜지스터 단면에서의 온도 분포 측정
권오명(Oh-Myoung Kwon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Understanding of heat generation in semiconductor devices is important in the thermal management of<br/> integrated circuits and in the analysis of the device physics. Scanning thermal microscope was used to<br/> measure the temperature distribution on the cross-section of an operating metal-oxide-semiconductor fieldeffect<br/> transistor (MOSFET). The temperature distributions were measured both in DC and AC modes in<br/> order to take account of the leakage current. The measurement results showed that as the drain bias was<br/> increased the hot spot moved to the drain.
작동중인 모스 전계 효과 트랜지스터 단면에서의 상대온도 및 전위 분포 측정
권오명,Kwon, Oh-Myoung 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.7
Understanding of heat generation in semiconductor devices is important in the thermal management of integrated circuits and in the analysis of the device physics. Scanning thermal microscope was used to measure the temperature and the electric potential distribution on the cross-section of an operating metal-oxide-semiconductor field-effect transistor (MOSFET). The temperature distributions were measured both in DC and AC modes in order to take account of the leakage current. The measurement results showed that as the drain bias was increased the hot spot moved to the drain. The density of the iso-potential lines near the drain increased with the increase in the drain bias.
오명화 ( Myoung Hwa Oh ),이전형 ( Jeon Hyeong Lee ),권유정 ( Yoo Jung Kwon ),이종대 ( Jong Dae Lee ),이명희 ( Myoung Hee Lee ),김경 ( Kyung Kim ) 대한물리의학회 2009 대한물리의학회지 Vol.4 No.2
Purpose:The purpose of this study was to investigated the effect of stability on heel-heights of insole in healthy adults. Methods:Subjects of 39 males measured stability index of the Biodex Stability System(BSS) by wearing shoes of 2cm, 5cm insoles including bare feet. The BSS was consisted of a movable balance platform and the platform was interfaced with computer software that enables the device to serve as an assessment of balance performance. Stability index of the BSS included overall stability index(OSI), anteroposterior stability index (APSI), mediolateral stability index(MLSI). In the BSS, subjects were asked to step on to the platform of the BSS and assume a comfortable position while maintaining slight flexion in the knees, looking straight ahead. Subjects were trained for 10min for adaptation to the heel-height of insole and then they maintained double limb stance for 2min. Biodex platform set to convert Lv.8 into Lv.1 gradually. Results:There were statistically significant differences between heel-heights of insole and stability index of OSI, APSI, and MLSI(p<.05). The result of post-hoc test were as follows; 1)OSI had significant differences between bare feet and 2cm, 5cm. 2)APSI had significant differences between bare feet and 2cm, 5cm. 3)MLSI had significant differences between bare feet and 2cm, 5cm(p<.05). Conclusions:We found that the more heels of insole high, the more stability index increases. In particular, balance index of insole above 5cm more increased and we could acknowledge that the insole above 5cm more effected balance of healthy adults.
오인규(In-Gyu Oh),최영석(Young-Seok Choi),김준형(Joo-Hyung Kim),양상호(San-Ho Yang),권오명(Oh-Myoung Kwon) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
In this paper, a numerical study has been carried out to investigate the influence of design variables on the performance of a jet fan. In order to achieve an optimum jet fan design, three-dimensional computational fluid dynamics and the DOE(Design of Experiments) method have been applied. Several geometric variables of rotor, stator, bell-mouth and silencer were employed to improve the performance of the jet fan considering reversible performance. The objective functions are defined as the effective exit velocity and total efficiency at the operating condition. Based on the present results, the effects of various components of jet fan were analyzed in a point of view of forward and reverse performance.