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이수열,이정한,이완,문치웅,조민형,Lee, S.Y.,Yi, J.H.,Yi, W.,Mun, C.W.,Cho, M.H. 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.5
Bridcage RF coil is one of the most widely used RF coils in MRI. In order to use birdcage RF coils in open MRI systems, an open tructured birdcage RF coil has been investigated. By opening the ring structure of an original birdcage RF coil and driving the coil at two opening ends, the original birdcage RF coil can be modified to an open structured coil. In order to improve magnetic field uniformity of the open birdcage RF coil, driving voltage phases at the two opening ends can be controlled to be in-phase or out-of-phase each other. Operating frequency of the open birdcage RF coil has been theoretically derived, and the theoretical derivation has been verified by experiments.
보행시 신발, 속도, 경사도에 따른 동작의 부드러움 차이
최진승(J. S. Choi),탁계래(G. R. Tack),이정한(J. H. Yi),이봉수(B. S. Lee),정순철(S. C. Chung),손상희(S. H. Sohn) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The purpose of this study was to evaluate the smoothness of the gait pattern according to shoe, walking speed, and slope. Eleven male university students used three types(running shoes, mounting climbing boots, elevated forefoot walking shoes) of shoes at various walking speeds(1.19, 1.25, 1.33, 1.56, 1.78, 1.9, 2.0, 2.11, 2.33m/s) and gradients (0, 3, 6, 10%) on a treadmill. Three-dimensional motion analysis (Motion Analysis Corp, Santa Rosa, CA, USA) was conducted with 4 Falcon high speed cameras. The results showed that elevated forefoot walking shoes had the lowest value of normalized jerk at the heel, which means that elevated forefoot walking shoes had the smoothest walking pattern at the heel. In contrast, elevated forefoot walking shoes had greater normalized jerk at the center of mass (COM) at most walking speeds, which means that the smoothness of gait pattern at the center of mass is the lowest for the elevated forefoot walking shoes. This movement at the COM might even have a beneficial effect of activating muscles in the back and abdomen more than other shoes.
정순철 ( S. C. Chung ),우유관 ( Y. K. Woo ),민병찬 ( B. C. Min ),김승철 ( S. C. Kim ),김철중 ( C. J. Kim ),이정한 ( J. H. Yi ) 한국감성과학회 2001 추계학술대회 Vol.2001 No.-
본 연구에서는 운전자의 피로감을 경감시킬 수 있는 자동차용 향 발생장치를 개발하였다. 본 시스템은 공기 압력차에 의해 휘발된 향을 산소와 혼합 시켜 외부로 분사하는 증발 확산 방식을 채택하였다. 또한 3-Port Solenoid Valve를 이용하여 산소만 공급할 수 있도록 또는 산소와 향을 동시에 공급할 수 있도록 두 가지의 분출 경로가 가능하도록 제작하였고 향이 분사되는 배관 앞에 체크 밸브(역류방지기)를 장착하여 한 방향으로만 향이 분출되도록 하였다.