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이상성(S. S. Lee),이송근(S. K. Lee),김동현(D. H. Kim),박종근(J. K. Park),문승일(S. I. Moon),윤용태(Y. T. Yoon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
향후 배전계통은 분산전원이 출현함에 따라 계획 및 운영이 더욱 복잡하게 될 것이며, 현재 송전계통에서 조류계산이 필요하듯이 향후 구조적으로 변화된 배전계통에서도 배전 조류계산이 필요하게 될 것이다. 또한 배전계통은 지역적인 특성으로 인하여 그 구조가 변전소를 중심으로 여러 개의 주 피이드로 나누어짐으로 그 구조는 매우 복잡하다. 이런 분산전원의 위치는 배전선로의 중간이나 말단이 될 것이며, 이와 같은 관점에서 볼 때, 배전계통에 대한 조류계산은 그 구조상 분산 조류계산 (Distributed Computation of Load Flow) 알고리즘을 필요로 할 것이다. 배전조류계산은 분산전원이 배전계통에 추가됨에 따라 더욱 부담이 될 것이다. 본 논문에서는 배전계통을 위한 분산형 조류계산의 알고리즘을 제안한다.
이상세 ( S. S Lee ),이영석 ( Y. S Lee ),임승관 ( S. K Lim ),정호춘 ( H. C Jeong ),진달복 ( D. B Chin ),이문영 ( M. Y Lee ),박병림 ( B. R Park ) 한국감성과학회 1999 춘계학술대회 Vol.1999 No.-
Easy check system for cardiac function was developed for computer user n this study. EKG amplifier was designed to remove a common noise and muscle noise. EKG pattern, and calculated real time heart rate and probability of arrhythmia were displayed in personal computer. This system would be an effective tool for checking cardiac function in everyone using computer.
최상대(S. D. Choi),김미선(M. S. Kim),안명천(M. C. Ahn),최영근(Y. G. Choi),김기왕(G. W. Kim),박달호(D. H. Park),황도근(D. G. Hwang),이상석(S. S. Lee) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.4
The electric signals for the voltage as a function of distance between Hall devices and permanent magnets over the radial artery were investigated. The electric signals, that means signals of arterial pulse wave, were differentiated by the hardware of circuits and then were changed to differential signals as magnetic field. The 3-D images simulated by the software as function of the intensity of differential signals were achieved. It shows that these system can apply to pulse diagnostic apparatus of portable type medical instrument.
Laser 열처리를 이용한 FeMn / NiFe 박막의 자화 반전
최상대(S. D. Choi),진대현(D. H. Jin),김선욱(S. W. Kim),김영식(Y. S. Kim),이기암(K. A. Lee),이상석(S. S. Lee),황도근(D. G. Hwang) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.6
We have studied local magnetization reversal and magnetic properties induced by Laser annealing method in the strip-patterned Ta/NiFe/FeMn/Ta and Ta/NiFe/FeMn/NiFe/Ta multilayers fabricated by ion-beam deposition. The films were exposed to the emission of the DPSS (Diode Pumped Solid State, Nd:YAG) laser under 600 G. The laser beam intensity increased up to 440 ㎽. When the laser illuminated the patterned film with the power of above 200 ㎽, the intensity of MR peak located in +87 Oe shrunk. A new MR peak was generated at -63 Oe. When the laser power is 400 ㎽, the location of positive MR peak(Hex) was changed slightly from +87 Oe to +76 Oe, and the MR ratio was decreased from 0.9% to 0.1 %. On the other hand, the new (negative) MR peak shifted from -63 Oe to -80 Oe, with the MR ratio increased up to 0.3%. As the illuminated area expanded, the intensity of opposite MR peak increased and it of negative MR peak decreased. This proved that the local reversal of exchange biasing should be realized by laser annealing.
FeMn / NiFe에서 Laser 열처리에 의한 자구연구
최상대(S. D. Choil),김선욱(S. W. Kim),진대현(D. H. Jin),이미선(M. S. Lee),안진희(J. H. Ahn),주호완(H. W.O Joo),김영식(Y. S. Kim),이기암(K. A. Lee),이상석(S. S. Lee),황도근(D. G. Hwang) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.6
We have studied local magnetization reversal by laser annealing in exchange biased NiFe/FeMn bilayer. Local magnetization reversal was performed by using the DPSS laser under external magnetic field of 600G. When the laser illuminated the patterned film with the power of above 300 ㎽ during 15 min, a magnetoresistance (MR) curve with symmetric peaks at the opposite field was obtained due to the local reversal of exchange biasing. The direction of exchange anisotropy in the locally reversed region can be restored by local laser annealing under alternating magnetic field, even if its MR peak was reduced by the damage and interdiffusion. The magnetic domain structure of the locally reversed region was measured by MFM. The new domains were generated by laser annealing near the exposed area.