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조민태,노형운,서상소,김재수,Cho, Min-Tae,Roh, Hyung-Woon,Suh, Sang-Ho,Kim, Jae-Soo 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
The objectives of the present study are to numerically and experimentally investigate the steady and pulsatile flow phenomena in the circular tubes, to quantitatively compare the flow characteristics of Newtonian and non-Newtonian fluids, and to find meaningful hemodynamic information through the flow analysis in the human blood vessels. The particle image velocimetry is adopted to visualize the flow fields in the circular tube. and the results from the particle image velocimetry are used to validate the results of the numerical analysis. In order to investigate the blood flow phenomena in the circular tube. constitutive equations, which are suitable to describe the rheological properties of the non-Newtonian fluids. are determined, and the steady and pulsatile momentum equations are solved by the finite volume prediction. The velocity vectors of the steady and pulsatile flow in the circular tube obtained by the particle image velocimetry arc in good agreement with those by the numerical analysis. For the given mass flow rate. the axial velocity profiles of the Newtonian and the non-Newtonian fluids appear differently. The pulsatile flow phenomena of the Newtonian and the non-Newtonian fluids are quite different from those of the steady flow.
관상동맥내 혈관벽 재형성에 의한 혈류역학적 응력변화에 관한 연구
조민태(Min-Tae Cho),서상호(Sang-Ho Suh),권혁문(Hyuck-Moon Kwon),유상신(Sang-Sin Yoo) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study, changes of shear stress and shear rate are obtained in order to investigate hemodynamic characteristics in the stenosed coronary artery with arterial remodeling. Two models for the arterial remodeling used for this research are a pre-stenotic dialation and a post stenotic dilation models. The wall shear stresses are calculated by the computer simulation. The peak shear stress appeared in the stenotic region of the post-stenotic model. Plaque rupture could be easily occured in the post-stenotic model. The area of negative shear stress values are distributed widely in the post-stenotic model. In the pre-stenotic dilation model, two small recirculation zones are formed, but the shear stresses are lower than in the post-stenotic dilation model. The shear stress on the surfaces of the pre-stenotic dilation model.
서상호,노형운,조민태,양수봉,Suh Sang-Ho,Roh Hyung-Woon,Cho Min-Tae,Yang Soo-Bong 한국공학교육학회 2000 공학교육연구 Vol.3 No.1
미래 지향적 공학교육은 기본이론을 철저하게 습득시키고 다양한 실험교육을 통해 창의성을 함양하며, 실제 사회와 연계된 실용성에 중점을 두어야 한다. 본 논문에서는 교육 패러다임의 변화에 발맞추어 LOD 시스템의 개발방향을 제시하고 공학실험과목의 콘텐츠를 제작하는 방법을 소개하였다. Internet 기반의 LOD시스템을 구축할 때 코스웨어 개발에 필요한 고려사항과 설계방안을 검토하여 이를 공학실험과목의 콘텐츠 제작시 적용하였다. 본 연구의 결과는 실험교과내용을 충실하게 설명하고, 공학실험에 필요한 학습보조자료와 멀티미디어 자료를 제공하여, 학생들의 학습증진에 기여할 뿐만 아니라 대학의 미래상을 예측하고 이를 구현함으로서 대학의 나가야 할 방향을 제시할 수 있을 것이다. Future education for engineering should focus on the teaching of fundamentals, creativity cultivated through various experimental educational programs, and industry-related practices. This study presents the development of the LOD system and a contents production of the experimental courses in engineering in accordance with paradigm change. In this study, considerations and design plan for developing LOD system are discussed and they are applied to the contents production of the experimental course in engineering. The results of this study help to teach the experimental courses completely, providing the course supplements and the multimedia data required in the experimental courses, and to promote and conduct the student's projects. This study can also anticipate an image of the future university and present the direction where the university should follow in the future.
접선류 임펠러형 수도미터의 노즐직경이 성능특성에 미치는 영향
서상호,이병호,조민태,노형운,Suh, Sang-Ho,Lee, Byung-Ho,Cho, Min-Tae,Roh, Hyung-Woon 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.3
In this study the effects of nozzle diameter on the performance characteristics for the tangential impeller-type water meter are studied experimentally. The nozzle is cut along the tangential direction of the inner case in the water meter. The nozzle shape is round and the number of nozzles used for the experimental study are 8. The performance characteristics are discussed for various nozzle diameters such as 3.1, 3.3, 3.5, 4.0, 4.5 and 5.0 mm. Among the tangential impeller-type water meters, the water meter with the nozzle diameter of 5.0 mm shows the least pressure loss and the instrumental error compared to the Korean Standards.
동맥경화증의 발생에 관한 혈류역학적 가설들에 대한 비교연구
서상호(Sang-Ho Suh),조민태(Min-Tae Cho),노형운(Hyung-Woon Roh),권혁문(Hyuck Moon Kwon) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Atherosclerosis, which is a degenerate disease, is believed to occur in the vascular system due to<br/> deposition of cholesterol and low density lipoprotein(LDL) or thrombosis on the blood vessel.<br/> Atherosclerosis narrows arterial lumen, which is known as stenosis phenomenon of blood vessel.<br/> Pathogenesis of atherosclerosis is thought to occur mainly by aging. Restenosis phenomenon is<br/> observed in the same site of insertion of a stent and balloon angioplasty after treatment of<br/> interventional theraphy. Several hypothetical theories related to the generation of atherosclerosis have<br/> been reported: high shear stress theory, low shear stress theory, high shear stress gradient theory, flow<br/> separation and turbulence theory and high pressure theory. However, no one theory clearly explains the<br/> causes of atherosclerosis. In the present study the generation of atherosclerosis in the left coronary<br/> artery is investigated. The hypotheses are verified by using the computer simulation.
협착이 발생된 관상동맥의 보상적 재형성과 혈류역학적 인자의 상관관계
서상호(Sang-Ho Suh),조민태(Min-Tae Cho),권혁문(Hyuck-Moon Kwon),유상신(Sang-Sin Yoo) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Atherosclerotic arteries show a tendency to undergo compensatory vascular enlargement during the early stage of plaque accumulation. The objective of the present study is to investigate the relationship between the compensatory remodelling of the stenosed coronary artery and hemodynamic stresses. Two models for the compensatory remodelling are a pre-stenotic dilation and a post-stenotic dilation models. The boundary condition at inlet is set to have the same flow rate for two models. and the wall shear stresses in two models are calculated by the computer simulation. The peak wall shear stress on the post-stenotic model is higher than that of the pre-stenotic model. Two recirculation zones are generated in the pre-stenotic model, and the zones in the pre-stenotic model are smaller than those in the post-stenotic model. Variation of the wall shear stress in the pre-stenotic model is lower than those in the post-stenotic model.
서상호(Sang-Ho Suh),조민태(Min-Tae Cho),김동주(Dong-Joo Kim),노형운(Hyung-Woon Roh) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
The objective of the present study were to measure the viscosities of non-Newtonian fluids by the transient flow concept in a capillary tube and to apply to hemodynamic studies and pump performance evaluations. The developed capillary tube viscometer could be used to measure the viscosities of the non-Newtonian fluids for a wide range of the shear rate by a run of experiment in a very short time interval. The measured viscosities of water and blood for different shear rates were good agreement with those of the well established data. The measured viscosities for muddy water varied with the shear rates.