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이정주,손종상,김정윤,김영호,Lee, J.J.,Son, J.S.,Kim, J.Y.,Kim, Y.H. 대한의용생체공학회 2011 의공학회지 Vol.32 No.2
The purpose of the present study was to analyze the lower stiffness over the difference between soft and stiff landings during hopping. Five male subjects performed hopping on two legs at 2.5 Hz. During the experiments, 3D motion capture system was used to obtain the kinematic data and two force plates were synchronized to calculate the kinetic data. We determined lower extremity stiffness of the knee and ankle from kinetic and kinematic data. Leg stiffness was approximately 1.2-times significantly higher in stiff landing than in soft landing_ There was no significant difference in knee joint stiffness between soft and stiff landings. Ankle joint stiffness was approximately 1.34-times significantly higher in stiff landing than in soft landing. These results suggest that humans adjust lower extremity stiffness over the comparison of two different landing methods we evaluated.
교환 결합 상태가 다른 [Ni80Fe20 / Cu / Co / Cu] 다층 박막에서 Co 계면 삽입이 자기적 특성에 미치는 영향
이정주(J. J. Lee),최상준(J. S. Choi),홍재화(J. H. Hong),권순주(S. J. Kwon) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.2
The [Ni_(80)Fe(20)/Cu/Co/Cu] multilayers were grown by evaporation technique, and according to magnetic exchange coupling relation, magnetoresistance ratio and magnetization curve were studied by Co inserting Ni_(80)Fe_(20)/Cu interface. Insertion of Co layer to the antiferromagnetically coupled system, i. e t_(Cu) =25 Å, decrease the MR ratio contrary to previous reports. However the insertion to the ferromagnetically coupled (t_(Cu) = 27 Å) and the non-coupled (t_(Cu)=47 Å) systems increase the ratio to 3.5 % and 6 % respectively. The results imply that the insertion change the magnetic exchange coupling state as well as the spin dependent scattering of conduction electrons. Besides, insertion of Co layer between Cu and Ni_(80)Fe_(20) layer enhances thermal stability to the 300℃, which indicates that insertion of Co has a role of the effective diffusion barrier.