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H.264/AVC를 위해 inter mode에 적용된 향상된 고속 모드 결정 알고리즘
양상봉(Sang-Bong Yang),조상복(Sang-Bock Cho) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
The H.264/AVC standard developed by the joint Video Team (JVT) provides better coding efficiency than previous standards. The new emerging H.264/AVC employs variable block size motion estimation using multiple reference frame with 1/4-pel MV(Motion Vector) accuracy. These techniques are a important feature to accomplish higher coding efficiency. However, these techniques are increased overall computational complexity. To overcome this problem, this paper proposes advanced fast mode decision suited for variable block size by classifying inter mode based on Rate Distortion Optimization(RDO) technique. Proposed algorithm is going to use to implement H/W structure for fast mode decision. The experimental results shows that the proposed algorithm provides significant reduction computational complexity without any noticeable coding loss and additional computation. Entire computational complexity is decreased about 30%.
A Study on Fracture Criterion of PMMA Plates Having a V-Notch with an End Hole
추원철(Won Chul Choo),조상봉(Sang Bong Cho),윤존도(Jon Do Yun) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.10
The aim of this study was to examine the validity of fracture criterion for PMMA plates that have a V-notch with an end hole. The predicted stress intensity factors and crack initiation angles by the fracture criterion based on the maximum circumferential stress and the novozhilov’s criteria were compared with the experimental results. By increasing the radius of end hole, the differences of predicted stress intensity factors and experimental results increased, possibly due to the plastic zone size. The results indicated that when the radius of end hole is < 1 ㎜, the fracture criterion would be useful.