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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.
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.
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.
CFD 및 DOE를 활용한 자동세차기 노즐시스템의 최적설계
최영석(Young-Seok Choi),정욱희(Uk-Hee Jung),권오명(Oh-Myoung Kwon),이경용(Kyoung-Yong Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
An optimization approach is investigated for the design of new nozzle system in a automatic car wash machine. Three-dimensional computational fluid dynamics and design of experiment methods have been employed to know the mutual interaction between the nozzle shape in the automatic car wash machine and the airflow velocity on the vehicle surface. The influence of selected design variables were examined as a results of optimization process. Predicted jet velocity distributions for the optimized geometry were compared with experimental data and the comparisons showed generally good agreements. Also, the performance of the dryer was improved with the optimized results.