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Intra Prediction Algorithm Using Adaptive Modes
Kyungmin Lim(임경민),Jaeho Lee(이재호),Seongwan Kim(김성완),Daehyun Pak(박대현),Sangyoun Lee(이상윤) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.6C
H.264/AVC는 화면 내, 화면 간 예측을 포함한 다양한 부호화 기술을 이용, 높은 부호화 성능을 보여준다. 그러나 화면 내 예측은 화면 간 예측에 비해 여전히 많은 부호화 데이터를 포함하고 있다. 본 논문에서는 적응적 모드선택 기술을 포함한 새로운 화면 내 부호화 기술을 제안한다. 인접 모드의 결합을 통한 새로운 부호화 모드와 단순화된 gradient 모드가 추가되면서 세밀한 방향의 특징 및 gradation 영역을 효과적으로 부호화한다. 또한 주변블록을 통해서 적절한 모드를 선택적으로 제공하면서 상대적으로 적은 복잡도와 높은 부호화 성능을 보여준다. 제안한 방법은 1.72배의 복잡도 증가수준에서 1.96%의 비트율 절감 및 0.25 dB의 PSNR 향상을 보여주고 있다. H.264/AVC has shown high coding efficiency by using various coding tools, including intra and inter prediction. However, there are still many more redundancy components in intra prediction than in inter prediction. In this paper, a novel intra prediction method is proposed with adaptive mode selection. The combined intra prediction modes and simplified gradient modes are added in order to refine the directional feature and gradation region. Suitable modes are selected according to the neighboring blocks that provide a high compression rate and lower computational complexity. The improvement of the proposed method is 1.96% in terms of the bitrate, 0.25 dB in PSNR, and 1.72 times in terms of the computational complexity.
급속 파괴 양극산화로 제조된 TiO₂ 나노 튜브 분말을 활용한 폴리에틸렌 복합 필름의 UV 광촉매 분해
임경민(Kyungmin Lim),김용태(Yong-Tae Kim),최진섭(Jinsub Choi) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.4
Photocatalytic decomposition of polyethylene film with TiO₂ nanotube powders (NTs) was investigated under UV irradiation at ambient conditions. TiO₂ NTs composed of individual nanotubes are prepared by rapid breakdown anodization technique. A comparative study on the photocatalytic decomposition of polyethylene-TiO₂ composite films prepared using TiO₂ nanoparticles (NPs) or TiO₂ NTs (NTs), respectively, was conducted under UV irradiation. Polyethylene film incorporated with TiO₂ NTs showed 26 wt% weight loss after 200 h under UV irradiation about two times faster decomposition rate than TiO₂ NPs which is attributed to large surface area of TiO₂ NTs.
다양한 형태의 AAO membrane 제조 및 리튬이온 전지의 분리막 응용 연구
김문수(Moonsu Kim),임경민(Kyungmin Lim),하재윤(Jaeyun Ha),김용태(Yong-Tae Kim),최진섭(Jinsub Choi) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.5
In order to improve the energy density and safety of Li-ion batteries, the development of a separator with high thermal stability and electrolyte wettability is an important desire. Thus, the ceramic separator to replace the polymer type is one of the most promising materials that can prevent short-circuit caused by the formation of dendrite and thermal deformation. In this study, we introduce the fabrication of various anodic aluminum oxide membranes for the application of Li-ion battery separators with the advantages of improved mechanical/thermal stability, wettability, and a high rate of Li+ migration through the membrane. Two different types of through-holes and branched anodic aluminum oxide membranes are well used in lithium-ion battery separators, however, branched anodic aluminum oxide membranes exhibit the most improved performance with capacity (126.0 mAh g<SUP>-1</SUP> @ 0.3C), capacity drop at the high C-rate (30.6 %), and low internal resistance (8.2 Ω).