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이현승(H.S. Lee),권순성(S.S. Kwon),박진서(J.S. Park),지윤철(Y.C. Jee),황민기(M.G. Hwang),박희남(H.N. Pak),심은보(E.B. Shim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
To represent atrial fibrillation (AF) we use the bi-domain model coupled with the Courtmanche model of human atrial cell and simulate the 3D electric waves on left atrial surface. S1-S2 stimulation protocol is applied to induce AF in the model. We obtained patient-specific geometries of left atrium (LA) from CT data and constructed three-dimensional (3D) simulation models. The purpose of this study is to investigate the effect of nerve activity on electric wave propagation in AF. In the cell model, we add acetycoline-activated potassium current to reflect the nerve effect of ganglionated plexus. Parasympathetic actions are formulated based on the experimental results of acetylcholine effects in patch-clamp studies. Computed results show that ach-activated potassium current by parasympathetic stimuls induces maintained AF waves than control condition.
다점 지지된 TFT-LCD 대형 유리기판의 처짐 최소 최적화
이현승(H. S. Lee),이영신(Y. S. Lee),변성우(S. W. Byun) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
A LCD glass plate is supported by multi-pin and golf-tee type support. In the FEM analysis, the support condition is treated as simply supported boundary condition. In this study, the optimization on the location of multi-simply support is conducted. The size optimization method of ANSYS 8.0 is used as the optimization tool to search for the optimal support location of LCD glass plate. In the manufacturing process, the support condition is a fatal factor of quality control of LCD production. From the results of optimization, deflection decreases 51% compared with the original model.