http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Numerical Study on Blood Flow Dynamics and Wall Mechanics in a Compliant Carotid Bifurcation Model
Minh Tuan Nguyen(웬민투안),Sang-Wook Lee(이상욱) 한국가시화정보학회 2015 한국가시화정보학회지 Vol.13 No.2
Blood flow simulations in an realistic carotid bifurcation model with considering wall compliance were carried out to investigate the effect of wall elasticity on the wall shear stress and wall solid stress. Canonical waveforms of flow rates and pressure in carotid arteries were imposed for boundary conditions. Compared to a rigid wall model, we found an increased recirculation region at the carotid bulb and an overall reduction of wall shear stress in a compliant model. Additionally, there was appreciable change of flow rate and pressure wave in longitudinal direction. Both solid and wall shear stress concentration occur at the bifurcation apex.
Numerical Investigation of Secondary Flow and Mixing in Small-amplitude Sinusoidal Vessels
Minh Tuan Nguyen,Sang-Wook Lee 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
There has been much evidence suggesting that the biological response of cardiovascular system is strongly correlated with local hemodynamic parameters, particularly, wall shear stress. In this study, we numerically investigated secondary flow and mixing performance in small-amplitude sinusoidal tubes under pulsatile inflow conditions, which is often observed in in-vivo vascular system. Although many studies have been conducted to investigate the flow features in helical, in-plane curvature would be interesting. Numerical results showed that combination of small amplitude sinusoidal curvature and pulsatile flow has significant influence on the nature of flow patterns and particle mixing mechanism. This implies that characterizing accurate geometry is essential in accurate predicting of in vivo hemodynamics and may motivate further study on any possibility of reflection of secondary flow on vascular remodeling and pathophysiology.
Minh Tuan Nguyen,Sang Wook Lee 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3
Numerical simulations on pulsatile flow within sinusoidally wavy shaped vessels were conducted for mean Reynolds number of 350, which is in the range of physiological flow rates. We considered the constant pitch of six tube diameters 6D and relatively small amplitudes from A = 0.1D to 0.5D for sinusoidal vessel geometry and investigated the secondary velocity profiles and particle mixing characteristics. The results showed that relatively small amplitude of wavy vessel geometry has significant influence on the nature of flow patterns and particle mixing characteristics. This implies that characterizing accurate geometry is essential for accurate prediction of in vivo hemodynamics and may motivate further study on any possibility of reflection of secondary flow on vascular remodeling and pathophysiology.
Optical Memory in DuPont Photopolymers by Using Femtosecond Laser Pulses
Minh-Tuan Trinh,임기수,김은경,Sun-Kyun Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.2
To investigate the feasibility of a high density optical memory in photopolymers, we used two-photon absorption of near-infrared femtosecond laser pulses to perform bit-wise three-dimensional storage. We monitored the transmitted probe beam, which was modulated by the change of refractive index caused by the femtosecond laser irradiation. The size of the spots generated by the focused Gaussian beam depended on the laser intensity and exposure time. The minimum lateral and longitudinal sizes of a spot were estimated as 0.5 and 5 $\mu$m, respectively.