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박해수(H. S. Park),윤용산(Y. S. Yoon) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
A finite element model of human head by linear biphasic theory is developed to study the dynamic response of the human head to impact. Intracranial tissues are modeled as a binary mixture, i.e. the fluid and solid phases. To validate the biphasic finite element formulation. the result of the numerical analysis of a one-dimensional wave propagation problem is compared with that of analytic solution. The permeabilities of the subarachnoid space and brain which may reproduce the same coup and contre-coup CSF( cerebral spinal fluid) pressures from the monophasic model are searched in the specified range of skull permeability. Then the intracranial pressure distributions from the biphasic model for the frontal impact are compared with those from the monophasic model. In general, the biphasic model produces a more injurious intracranial pressure distribution than the monophasic model.<br/>
Pd층의 두께 변화에 따른 [Co/Pd] 다층박막의 연엑스선 방사광 분광 연구
김대현(D. H. Kim),이은숙(Eunsook Lee),김현우(Hyun Woo Kim),성승호(Seungho Seong),강정수(J.-S. Kang),양승모(Seung-Mo Yang),박해수(Hae-Soo Park),홍진표(JinPyo Hong) 한국자기학회 2016 韓國磁氣學會誌 Vol.26 No.4
We have investigated the electronic structures of intermetallic multilayer (ML) films of [Co(2Å)/Pd(xÅ)] (x: the thickness of the Pd sublayer; x = 1 Å, 3 Å, 5 Å, 7 Å, 9 Å) by employing soft X-ray absorption spectroscopy (XAS) and soft X-ray magnetic circular dichroism (XMCD). Both Co 2p XAS and XMCD spectra are found to be similar to one another, as well as to those of Co metal, providing evidence for the metallic bonding of Co ions in [Co/Pd] ML films. By analyzing the measured Co 2p XMCD spectra, we have determined the orbital magnetic moments and the spin magnetic moments of Co ions in [Co(2Å)/Pd(xÅ)] ML films. Based on this analysis, we have found that the orbital magnetic moments are enhanced greatly when x increases from 1 Å to 3 Å, and then do not change much for x ≥ 3 Å. This finding suggests that the interface spin-orbit coupling plays an important role in determining the perpendicular magnetic anisotropy in [Co/Pd] ML films.