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Temperature and magnetic field dependent optical properties of superconducting $MgB_2$ thin film
정종훈,이해자,김경완,김명훈,노태원,강원남,정창욱,이성익,Jung, J. H.,Lee, H. J.,Kim, K. W.,Kim, M. W.,Noh, T. W.,Wang, Y. J.,Kang, W. N.,Jung, C. U.,Lee, Sung-Ik 한국초전도학회 2001 Progress in superconductivity Vol.3 No.1
We investigated the temperature and magnetic field dependent optical properties of a$ MgB_2$ thin film in the far-infrared region. In the superconducting state, i.e. 5 K, we obtained the values of superconducting gap $2\Delta$ ~ 5.2 meV and $2\Delta$ $_{k}$ $B/T_{c}$ ~1.8. Although the value of$ 2\Delta$</TEX$B/T_{c}$ was nearly half of the BCS value, the $2\Delta$ seemed to follow the temperature dependence of the BCS formula. Under the magnetic field (H), the superconducting state became suppressed. Interestingly, we found that the normal state area fraction abruptly increased at low field but slowly increased at high field. It did not follow the H-dependences predicted for a s-wave superconductor (i.e. a linear dependence) nor for a s-wave one (i.e. $H^{1}$2/ dependence). We discussed the complex gap nature of $MgB_2$ in comparison with two gap and anisotropic s-wave scenarios.ios.
비선형 현가요소를 가진 철도차량의 승차감 및 민감도 해석
김명훈(M.H.KIm),탁태오(T.O.Tak),박진용(J.Y.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
In this study, ride sensitivity analysis of a train with non-linear suspension elements are performed. Non-linear characteristics of springs and dampers for primary and secondary suspensions of a train is parameterized. Equation of motion of the train model is derived, and using the direct differentiation method. sensitivity equations are obtained. For a nominal ride quality performance index, sensitivity analysis with respect to various design parameters regarding non-linear suspension parameters are carried out.<br/>