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항공기소음 자동측정국 감시효율 향상을 위한 위치설정에 대한 연구
손정곤(Son, Jung-Gon),정우홍(Jeong, Woo-Hong),황민기(Hwang, Min-Gee),권현(Gwon, Hyun) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
The monitoring efficiency of the aircraft noise monitoring stations is decided to the reference noise level and the infringement of each monitoring stations. We calcurates the monitoring efficiency of three noise monitoring station among twelve in the vicinity of Gimpo Int'l Airport. As a result, the monitoring efficiency shows that the noise monitoring stations No#3, No#5 and No#6 are 14.3%, 18.5% and 29.3% respectively, Among them No#6 staion looks higher efficiency than another two stations because of underneath the flight trackas.
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.
3D 가상심장을 이용한 심방세동의 complex fractionated atrial electrogram (CFAE) 분석 및 catheter ablation
박진서(J.S.Park),권순성(S.S.Kwon),김준우(J.W.Kim),이현승(H.S.Lee),지윤철(Y.C.Ji),황민기(M.K.Hwang),박희남(H.N.Pak),심은보(E.B.Shim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study analyzed complex fractionated atrial electrogram (CFAE) and CFAE ablation for atrial fibrillation patient. We modeled atrial fibrillation by a 3D virtual heart. For this purpose, measurement techniques of cardiac ablation using catheter was numerically implemented by a simulation method, and FIR filtering was used to analyze electric signal pattern measured. Through these methods, CFAE values was calculated in the 3D mapping at virtual heart, and we found ablation target of atrial fibrillation patient. This study also simulated CFAE and CFAE-based ablation for 20 patients and the computed results were compared with actual clinical data.