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Unequal Luby Transform Based on Block Weight Shift (ULT-BWS) for Error Resilient Video Transmission
Springer Science + Business Media 2016 Wireless personal communications Vol.89 No.4
<P>In this paper, we propose an unequal Luby transform (LT) based on block weight shift (ULT-BWS) method as an unequal forward error correction method to minimize video distortion over packet-lossy networks. First, we consider unequal amount of error propagation effects from packet loss in hierarchical prediction structure to give unequal property in an LT codes. For robust video transmission over various channel status, the ULT-BWS method assigns an efficient amount of protection for frame blocks with different error propagation weights by controlling the range of more important blocks in a group of pictures. Simulation results demonstrate that the proposed ULT-BWS method gives robust performance and significantly improved video quality, compared with the conventional ULT schemes.</P>
Ha, H.,Hwang, D.,Kim, G.B.,Kweon, J.,Lee, S.J.,Baek, J.,Kim, Y.H.,Kim, N.,Yang, D.H. Pergamon Press 2016 Magnetic resonance imaging Vol.34 No.6
Quantifying turbulence velocity fluctuation is important because it indicates the fluid energy dissipation of the blood flow, which is closely related to the pressure drop along the blood vessel. This study aims to evaluate the effects of scan parameters and the target vessel size of 4D phase-contrast (PC)-MRI on quantification of turbulent kinetic energy (TKE). Comprehensive 4D PC-MRI measurements with various velocity-encoding (VENC), echo time (TE), and voxel size values were carried out to estimate TKE distribution in stenotic flow. The total TKE (TKE<SUB>sum</SUB>), maximum TKE (TKE<SUB>max</SUB>), and background noise level (TKE<SUB>noise</SUB>) were compared for each scan parameter. The feasibility of TKE estimation in small vessels was also investigated. Results show that the optimum VENC for stenotic flow with a peak velocity of 125cm/s was 70cm/s. Higher VENC values overestimated the TKE<SUB>sum</SUB> by up to six-fold due to increased TKE<SUB>noise</SUB>, whereas lower VENC values (30cm/s) underestimated it by 57.1%. TE and voxel size did not significantly influence the TKE<SUB>sum</SUB> and TKE<SUB>noise</SUB>, although the TKE<SUB>max</SUB> significantly increased as the voxel size increased. TKE quantification in small-sized vessels (3-5-mm diameter) was feasible unless high-velocity turbulence caused severe phase dispersion in the reference image.
Molecular Association of Glucose Transporter in the Plasma Membrane of Rat Adipocyte
Hah. Jong-Sik 대한생리학회 1991 대한생리학회지 Vol.25 No.2
Molecular association of glucose transporters with the other proteins in the plasma membrane was assessed by gel electrophoresis and immunoblot techniques. Approximately 31.5±5.1% of GLUT-4, 64.8±2.7% of clathrin, 48.7% of total protein in the plasma membrane (PM) were found insoluble upon extraction with 1% Tx-100. Sodium dodecyl sulfate polyacrylamide gel electrophoresis revealed that the Tx-100 insoluble PM fraction contained about 4 major polypeptides with apparent molecular weight of above 200, 100-120, 80 and 30-35 KDa that were readily removed upon wash with a high pH buffer which is known to remove clathrin and 0.5 M Tris-buffer which is known to remove assembly proteins (AP). Immunoblotting of GLUT4 and clathrin against specific antibodies showed that GLUT-4 and clathrin were co-solubilized up to 84.6% and 82.7% respectively by wash with a high pH buffer and 1% Tx-100. When the membrane was pre-washed with a high pH buffer and 0.5 M Tris solution, GLUT4 and clathrin were not solubilized further suggesting that GLUT4 molecules are in molecular association with clathrin, AP and/or other extrinsic membrane proteins in plasma membrane and the formation of clathrin-coated structures might be involved in insulin stimulated glucose transporter translocation mechanism.
HAH, Byoung-Joo 국제지역학회 2002 국제지역연구 Vol.6 No.2
해방 후 한국과 아랍간의 외교관계 발전은 몇 번의 전환점을 거쳐 지속적으로 발전하여 왔다. 다른 한편으로 1965년에 한국에 최초로 아랍교육기관인 아랍어과가 개설됨으로써 학계의 교육 및 연구의 장이 시작되었다. 이후 관련 교육기관과 연구기관의 지속적인 발전을 거듭하여왔다. 특히 1966년에는 한국 최초의 중동연구기관인 한국중동아프리카연구원(KIMA)이 설립되었다. 1979년에는 전국규모의 중동학술 단체인 한국중동학회(KAMES)가 설립되어 교육 및 연구기반이 확충되어왔다. 이는 직간접으로 한국과 아랍과의 관계발전에 공헌하여 온 것이 사실이다. 이에 본 연구에서는 이러한 교육 및 연구기관의 역할을 중심으로 연구 분석하고자 하는 것이다. 이러한 목적을 위해 국내 모든 관련 교육기관 및 학술기관을 연구 대상으로 하였으며, 크게 연구기관 자체와 교육 및 연구자로 나누어 고찰하였다.