Search Results - "Ha, Hojin"

Layer-weighted unequal error protection for scalable video coding extension of H.264/AVC by Ha, Hojin, Yim, Changhoon

“…The scalable video coding extension of H.264/AVC is a current standardization project. This paper deals with unequal error protection (UEP) scheme for scalable…”
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Computational analysis of naturally oscillating tandem square and circular bluff bodies: a GPU based immersed boundary - lattice Boltzmann approach by Adeeb, Ehsan, Ha, Hojin

“…In this study, a fluid-structure interaction solver is employed to explore the flow physics of tandem oscillating square bluff bodies by varying the corner…”
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Assessing the impact of turbulent kinetic energy boundary conditions on turbulent flow simulations using computational fluid dynamics by Jung, Eui Cheol, Lee, Gyu-Han, Shim, Eun Bo, Ha, Hojin

“…Computational fluid dynamics has been widely used to study hemodynamics, but accurately determining boundary conditions for turbulent blood flow remains…”
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Fluid–structure interaction simulation of visceral perfusion and impact of different cannulation methods on aortic dissection by Lee, Gyu-Han, Heo, Woon, Lee, Youngjin, Kim, Tae-Hoon, Huh, Hyungkyu, Song, Suk-Won, Ha, Hojin

“…Hemodynamics in aortic dissection (AD) is closely associated with the risk of aortic aneurysm, rupture, and malperfusion. Altered blood flow in patients with…”
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Age-Related Vascular Changes Affect Turbulence in Aortic Blood Flow by Ha, Hojin, Ziegler, Magnus, Welander, Martin, Bjarnegård, Niclas, Carlhäll, Carl-Johan, Lindenberger, Marcus, Länne, Toste, Ebbers, Tino, Dyverfeldt, Petter

“…Turbulent blood flow is implicated in the pathogenesis of several aortic diseases but the extent and degree of turbulent blood flow in the normal aorta is…”
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Multi-VENC acquisition of four-dimensional phase-contrast MRI to improve precision of velocity field measurement by Ha, Hojin, Kim, Guk Bae, Kweon, Jihoon, Kim, Young-Hak, Kim, Namkug, Yang, Dong Hyun, Lee, Sang Joon

“…Purpose The present study aims to improve precision of four‐dimensional (4D) phase‐contrast (PC) MRI technique by using multiple velocity encoding (VENC)…”
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4D Flow MRI quantification of blood flow patterns, turbulence and pressure drop in normal and stenotic prosthetic heart valves by Ha, Hojin, Kvitting, John-Peder Escobar, Dyverfeldt, Petter, Ebbers, Tino

“…To assess valvular flow characteristics and pressure drop in a variety of normal and stenotic prosthetic heart valves (PHVs) using 4D Flow MRI. In-vitro flow…”
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Assessment of turbulent viscous stress using ICOSA 4D Flow MRI for prediction of hemodynamic blood damage by Ha, Hojin, Lantz, Jonas, Haraldsson, Henrik, Casas, Belen, Ziegler, Magnus, Karlsson, Matts, Saloner, David, Dyverfeldt, Petter, Ebbers, Tino

“…Flow-induced blood damage plays an important role in determining the hemodynamic impact of abnormal blood flow, but quantifying of these effects, which are…”
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Effect of swirling inlet condition on the flow field in a stenosed arterial vessel model by Ha, Hojin, Lee, Sang-Joon

“…Abstract Blood flow in an artery is closely related to atherosclerosis progression. Hemodynamic environments influence platelet activation, aggregation, and…”
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The influence of the aortic valve angle on the hemodynamic features of the thoracic aorta by Ha, Hojin, Kim, Guk Bae, Kweon, Jihoon, Lee, Sang Joon, Kim, Young-Hak, Kim, Namkug, Yang, Dong Hyun

“…Since the first observation of a helical flow pattern in aortic blood flow, the existence of helical blood flow has been found to be associated with various…”
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Characterization of baseline hemodynamics after the Fontan procedure: a retrospective cohort study on the comparison of 4D Flow MRI and computational fluid dynamics by Lee, Gyu-Han, Koo, Hyun Jung, Park, Kyung Jin, Yang, Dong Hyun, Ha, Hojin

“…The aim of this study was to characterize the hemodynamics of Fontan patients using both four-dimensional flow magnetic resonance imaging (4D Flow MRI) and…”
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Native Sinus Hemodynamics and Thrombosis in Transcatheter Heart Valve: Effect of Implant Depth and Coronary Flow by Koo, Hyun Jung, Kang, Jihun, Kang, Do-Yoon, Ahn, Jung-Min, Park, Duk-Woo, Park, Seung-Jung, Kang, Joon-Won, Ha, Hojin, Yang, Dong Hyun

“…This study aimed to investigate the hemodynamic and anatomic factors associated with sinus thrombosis following transcatheter aortic valve replacement (TAVR),…”
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Turbulent Kinetic Energy Measurement Using Phase Contrast MRI for Estimating the Post-Stenotic Pressure Drop: In Vitro Validation and Clinical Application by Ha, Hojin, Kim, Guk Bae, Kweon, Jihoon, Huh, Hyung Kyu, Lee, Sang Joon, Koo, Hyun Jung, Kang, Joon-Won, Lim, Tae-Hwan, Kim, Dae-Hee, Kim, Young-Hak, Kim, Namkug, Yang, Dong Hyun

“…Although the measurement of turbulence kinetic energy (TKE) by using magnetic resonance imaging (MRI) has been introduced as an alternative index for…”
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Fluid-dynamic optimal design of helical vascular graft for stenotic disturbed flow by Ha, Hojin, Hwang, Dongha, Choi, Woo-Rak, Baek, Jehyun, Lee, Sang Joon

“…Although a helical configuration of a prosthetic vascular graft appears to be clinically beneficial in suppressing thrombosis and intimal hyperplasia, an…”
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Non-invasive cardiovascular magnetic resonance assessment of pressure recovery distance after aortic valve stenosis by Fernandes, Joao Filipe, Gill, Harminder, Nio, Amanda, Faraci, Alessandro, Galli, Valeria, Marlevi, David, Bissell, Malenka, Ha, Hojin, Rajani, Ronak, Mortier, Peter, Myerson, Saul G., Dyverfeldt, Petter, Ebbers, Tino, Nordsletten, David A., Lamata, Pablo

“…Decisions in the management of aortic stenosis are based on the peak pressure drop, captured by Doppler echocardiography, whereas gold standard catheterization…”
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Numerical simulations of wind loading on the floating photovoltaic systems by Lee, Gyu-Han, Choi, Ji-Woong, Kim, JaeUn, Seo, Ji-Hyun, Ha, Hojin

“…This study analyses the fluid dynamics of wind loadings on the floating photovoltaic (PV) system using computational fluid dynamics. The two representative…”
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Effect of pannus formation on the prosthetic heart valve: In vitro demonstration using particle image velocimetry by Ha, Hojin, Koo, Hyun Jung, Huh, Hyung Kyu, Kim, Guk Bae, Kweon, Jihoon, Kim, Namkug, Kim, Young-Hak, Kang, Joon-Won, Lim, Tae-Hwan, Song, Jae-Kwan, Lee, Sang Joon, Yang, Dong Hyun

“…Although hemodynamic influence of the subprosthetic tissue, termed as pannus, may contribute to prosthetic aortic valve dysfunction, the relationship between…”
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Fluid-dynamic effect of pannus formation around the prosthetic heart valve: in vitro demonstration using a heart-mimic pulsatile pump and particle image velocimetry by Kang, Jihun, Kim, Doohyeon, Lee, Youngjin, Choi, Woorak, Lee, Sang Joon, Yang, Dong Hyun, Ha, Hojin

“…The abnormal growth of tissue, called pannus, is frequently found in patients who have an implanted prosthetic heart valve. Its growth is related to the valve…”
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In-vitro and In-Vivo Assessment of 4D Flow MRI Reynolds Stress Mapping for Pulsatile Blood Flow by Ha, Hojin, Huh, Hyung Kyu, Park, Kyung Jin, Dyverfeldt, Petter, Ebbers, Tino, Kim, Dae-Hee, Yang, Dong Hyun

“…Imaging hemodynamics play an important role in the diagnosis of abnormal blood flow due to vascular and valvular diseases as well as in monitoring the recovery…”
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Improving Blood Flow Visualization of Recirculation Regions at Carotid Bulb in 4D Flow MRI Using Semi-Automatic Segmentation with ITK-SNAP by Ngo, Minh Tri, Lee, Ui Yun, Ha, Hojin, Jung, Jinmu, Lee, Dong Hwan, Kwak, Hyo Sung

“…Assessment of carotid bulb hemodynamics using four-dimensional (4D) flow magnetic resonance imaging (MRI) requires accurate segmentation of recirculation…”
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