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노나현(Nahyeon Roh),김아람(Aram Kim),박민지(Minji Park),박민혜(Minhye Park),전예진(Yejin Jeon),김가은(Kaeun Kim),백유진(Yujin Baek),오은미(Eunmi Oh),오세종(Sejong Oh) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, numerical study is conducted to suggest wing which reduce the vortex strength generated by the leading aircraft. The wing with 3 holes is suggested, which is named as Raon-hajae. Computational grid is created by using pointwise. ANSYS Fluent is employed with the incompressible assumption and RSM turbulence model. As a result of this study, it is confirmed that decrement of lift coefficient is 2.1% and increment of drag coefficient is 11.8%. Nevertheless penalty of aerodynamic performance, reduction of vortex strength is confirmed up to 63%.
HEVC 복호기에서의 타일, 슬라이스, 디블록킹 필터 병렬화 방법
손소희(Sohee Son),백아람(Aram Baek),최해철(Haechul Choi) 한국방송·미디어공학회 2017 방송공학회논문지 Vol.22 No.4
The development of display devices and the increase of network transmission bandwidth bring demands for over 2K high resolution video such as panorama video, 4K ultra-high definition commercial broadcasting, and ultra-wide viewing video. To compress these image sequences with significant amount of data, High Efficiency Video Coding (HEVC) standard with the highest coding efficiency is a promising solution. HEVC, the latest video coding standard, provides high encoding efficiency using various advanced encoding tools, but it also requires significant amounts of computation complexity compared to previous coding standards. In particular, the complexity of HEVC decoding process is a imposing challenges on real-time playback of ultra-high resolution video. To accelerate the HEVC decoding process for ultra high resolution video, this paper introduces a data-level parallel video decoding method using slice and/or tile supported by HEVC. Moreover, deblocking filter process is further parallelized. The proposed method distributes independent decoding operations of each tile and/or each slice to multiple threads as well as deblocking filter operations. The experimental results show that the proposed method facilitates executions up to 2.0 times faster than the HEVC reference software for 4K videos.