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홍승배(Seung-Bae Hong),최성환(Sung-Hwan Choi),이현승(Hyun-Seung Lee),지윤철(Yoon-Cheol Ji),김영만(Young-Man Kim),김기태(Ki-Tae Kim),심은보(Eun Bo Shim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Electric shock can terminate reentrant wave or fibrillation in ventricle. The goal of the present study is to examine the effect of shock strength on defibrillation efficiency. For this purpose, we developed a computational model of virtual defibrillation based on a realistic 3D geometry of canine ventricles. The ventricles were electrically paced by virtual electrodes, and then truncated-exponential monophasic and biphasic shocks with varying shock strength are applied via external electrodes. This study used bidomain method to simulate electric wave phenomena in ventricles, and a finite element method with Galerkin approximation is used to discretize the 3D domain spatially. We applied effective strength of monophasic and biphasic shocks to the ventricular fibrillation model and observed whether the fibrillation is terminated or not by the specific strength of the imposed electric shock.
최승윤(Choi Seung Yun),홍승배(Hong Seung Bae),임기무(Lim Ki Moo),심은보(Shim Eun Bo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Arrhythmia causes sudden cardiac death. In the past, there were medical limitations in finding the cause of arrhythmia. As an alternative solution for research of arrhythmia, there have been studies to find the causes of arrhythmia by producing a virtual heart model. Medically, arrhythmia has two main causes: abnormal occurrence of action potential and abnormal conduction of action potential. Based on these, the tachycardia, which is one of the arrhythmia, was manifested and the phenomenon of ventricular fibrillation was numerically analyzed in this study. For this purpose, an electrophysiological model of ventricular cells was implemented, which was subsequently applied to the reaction-diffusion partial differential equation to interpret the macroscopic conduction phenomenon in two-dimensional tissues. The ventricular fibrillation refers to a condition where several irregular waves occur in cardiac tissue, whose generation mechanism is pathologically related to the cardiac tissue.
유체 와류와 심장 회귀성파동의 유사성 분석을 통한 부정맥 진단 인자 발굴
류아진(Ah-Jin Ryu),홍승배(Seung-Bae Hong),임기무(Ki Moo Lim),심은보(Eun-Bo Shim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
We introduced newly proposed parameters related to the electric wave propagation in cardiac tissue. Method to find the parameter was hinted from fluid dynamics. In fluid dynamics, governing partial differential equations for fluid flow is non-dimensionalized. To categorize complex flow phenomenon such as turbulence, we use non-dimensional parameters obtained during the non-dimensionalization process. Since the similarity between fluid turbulence and chaotic electric waves in heart was well recognized, we supposed that the approach used in fluid turbulence can be also plausible to analyze chaotic electric waves in heart. Thus, we non-dimensionalized the governing equation of the electric wave conduction in cardiac tissue and found a new non-dimensional parameter named as Shim number. This implies a tissue or cellular length scale relative to half-diffusive length. Though we did not provide any supporting data for the dependence of electric wave phenomena of cardiac tissue on the number, it can be a plausible candidate as a categorizing parameter for chaotic phenomena in cardiac tissue such as tachycardia and fibrillation.
사물지능통신(M2M) 융합서비스 지원을 위한 이기종 플랫폼 간 연동방안
이성협 ( Sung-hyup Lee ),전근표 ( Gun-pyo Jeon ),권선영 ( Sun-young Kwon ),서종한 ( Jong-han Seo ),장원규 ( Won-gyu Jang ),홍승배 ( Seung-bae Hong ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
최근 IT(Information Technology)와 他산업 간의 융·복합이 촉진되면서 새로운 융합서비스로 사물지능 통신(M2M, Machine to Machine)이 차세대 지능형 인프라 기반의 핵심 서비스로 부각되고 있다. 사물지능 통신은 기존의 통신 인프라를 활용하여 사물정보의 수집, 가공, 처리를 통해 최종 서비스를 제공하는 기술 분야로 PHY, MAC, 라우팅에 대한 기술 이슈보다는 서비스 관점에서의 네트워크 아키텍처 정의와 기능, 서비스 플랫폼 간의 연동, M2M 단말과 네트워크 간의 인터페이스에 대한 연구가 진행 중이다. 본 논문에서는 사물지능통신 융합서비스를 사용자에게 보다 편리하게 제공하기 위한 기존 플랫폼 간의 연동을 위한 요구사항과 방안을 제안한다.