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불안정지지면 훈련에 따른 만성 뇌졸중 환자의 다리 근활성도와 동요속도의 상관성 연구
서흥원 ( Heung Won Seo ),김명철 ( Mung Chul Kim ) 대한통합의학회 2013 대한통합의학회지 Vol.1 No.4
Purpose: This research was conducted to see the correlation between sway speed and muscle activity for lower extremity of stroke patients through unstable surface training. Methods: A total of 60 patients were randomly divided unstable surface group (30 peoples) and stable surface group (30 people). Then they were asked to carry out the same exercise program for 6 weeks. The unstable surface group and stable surface group performed the exercise program on the balance mat and on the hard wood block. We checked the changes of sway speed and the changes in muscle activity for lower extremity. Results: The unstable surface group displayed significantly reduced sway speed, and improved muscle activity of lower extremity. There were significant correlation between change amount of muscle activity and sway velocity in Gastrocnemius, Biceps femoris during unstable surface training(r=.373, p<.05)(r=.369, p<.05). And there were not show significant differences during stable surface training. Conclusion: Judging from this, we can have knowledge that the correlation between increase of muscle activity and decrease of sway velocity for Gastrocnemius, Biceps femoris in the unstable surface training.
白点基,徐興源 부산대학교 공과대학 1992 工大論文集 Vol.43 No.-
The aim of the present paper is to develop a computer program predicting the ultimate fracture strength of initially cracked structures under monotonically increasing external loads. For this purpose, two kinds of 3-D isoparametric solid elements, one 6-node wedge element and another 8-node brick element are formulated along the small deformation theory. Plasticity in the element is checked using von Mises' yield criterion. Elasto-plastic stiffness matrix of the element is calculated taking account of strain hardening effect. If the principal strain at crack tip exceeds the critical fracture strain depending on the material property, the crack tip is supposed to be opened and the crack tip node which was previously constrained in the direction perpendicular to the crack line is becomes free. After that, the crack may be propagated to the adjacent node. Once a crack tip node is fractured, the energy of the newly fractured node should be released which is to be absorbed by the remaining part. The accumulated reaction force which was carried by the newly fractured node so far is then applied in the opposite direction. During the action of crack tip relief force, since unloading may occur in the yielded element, the unloading check should be made. If the yielded element unloads, the elastic stress-strain equation is used in the calculation of the stiffness matrix of the element, while for the loading elements, the elastoplastic stress-strain equation is continuously used. Verification of the computer program is made comparing with the experimental results for center cracked panel subjected to tensil and bending load. Also some factors affecting ultimate fracture strength of initially cracked plates are investigated. It is concluded that the computer program developed here gives an accurate solution and may be useful tool for predicting the ultimate fracture load of initially cracked structural systems under monotonically increasing external loads.