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블록기반 부호화 비디오에서 인과적 블록 경계정합을 이용한 적응적 오류 검출
주용수,김태식,김남철 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.8C
본 논문에서는 블록기반으로 부호화된 비디오 영상에서 전송 오류로 인하여 발생하는 화질저하를 개선하기 위하여 인과적 블록경계 정합법을 사용하여 효율적으로 복호가능 오류를 검출하는 알고리즘을 제안하였다. 제안된 방법에서는 먼저 현재 블록의 경계들과 인과적 주위블록외 경계들간 부정합 전력을 계산한다. 다음, 이렇게 구한 부정합 전력들 중 하나라도 인과적 주위 블록들의 통계적 특성을 사용하여 적응적으로 구한 역치보다 크면 오류가 있는 것으로 판단한다. 실제로 H.263으로 부호화된 비디오를 가지고 $10^{-3}$-$10^{-4}$ BERs에서 16비트 연속적인 비트 에러를 가지는 환경에서 제안한 방법을 적용하였다. 기존의 블록경계정합 오류검출법의 하나인 Zeng의 방법과 비교하면, 에러 검출율의 향상은 최대 20%, 그리고 검출된 오류를 은닉 처리한 결과영상의 PSNR 향상은 최대 3.5㏈임을 보여준다. In this Paper, we Propose an effective boundary matching based error detection algorithm using causal neighbor blocks to improve video quality degraded from channel error in block-coded video. The proposed algorithm first calculates boundary mismatch powers between a current block and each of its causal neighbor blocks. It then decides that a current block should be normal if all the mismatch powers are less than an adaptive threshold, which is adaptively determined using the statistics of the two adjacent blocks. In some experiments under the environment of 16bi1s burst error at bit error rates (BERs) of 10$^{-3}$ -10$^{-4}$ , it is shown that the proposed algorithm yields the improvements of maximum 20% in error detection rate and of maximum 3.5㏈ in PSNR of concealed kames, compared with Zeng's error detection algorithm.
주용수,이은진 경남발전연구원 2011 중점정책연구 Vol.2011 No.-
The stream length of the Milyanggang is 100 ㎞, and the catchment area accounts for 6% of the Nakdong River watershed is 1,447.3 ㎢. The Milyanggang is a tributary of the Nakdong River, it"s very important to the local population in the lower Nakdong River who drinks through withdrawal drinking water from the Nakdong River. In spite of continual the Ministry of Environment and Milyang city‘s effort , the water quality of the Milyanggang has become worse since 2006. The objective of this paper is to suggest an improvement effect of water quality. For that, the degeneration causes of the water quality of the Milyanggang have divided into natural causes(precipitation, detention status) and artificial causes(sewer penetration rate, Milyang sewage wastewater treatment plant, non-point source, Milyang dam discharge). The natural causes, especially precipitation has concluded that one of causes because of impossible control. also, the need for constant study have suggested about detention status of the downstream. Looking at the Improvement of water quality for artificial causes, First, sewer treatment areas of Milyang should be expanded to the untreated area. Second, Improvement of water quality of Milyang sewage wastewater treatment plants. Third, Milyang dam should the water supply plan. Fourth, the establish non-point source management should establish. Finally, the study on detention status in the downstream of Milyanggang should be condected.
지연 이중 버퍼링: OneNAND 플래시를 이용한페이지 반입 비용 절감 기법
주용수,박재현,정성우,정의영,장래혁 대한전자공학회 2007 電子工學會論文誌-SD (Semiconductor and devices) Vol.44 No.3
OneNAND flash combines the advantages of NAND and NOR flash, and has become an alternative to the former. But the advanced features of OneNAND flash are not utilized effectively in demand paging systems designed for NAND flash. We propose delayed dual buffering, a demand paging system which fully exploits the random-access I/O interface and dual page buffers of OneNAND flash demand paging system. It effectively reduces the time of page transfer from the OneNAND page buffer to the main memory. On average, it achieves and 28.5% reduction in execution time and 4.4% reduction in paging system energy consumption. NAND와 NOR 플래시의 장점을 결합한 OneNAND 플래시가 출시되면서 기존의 NAND 플래시를 빠르게 대체하게 되었다. 하지만 기존의 NAND 플래시 기반 요구 페이징 시스템에서는 OneNAND 플래시의 기능들이 제대로 활용되지 않았다. 본 연구에서는 OneNAND 플래시의 임의 접근 기능과 이중 페이지 버퍼를 활용하는 새로운 OneNAND 플래시 기반 요구 페이징 기법인 지연 이중 버퍼링 기법을 제안하였다. 이 기법은 요구된 페이지를 페이지 버퍼로부터 주기억장치로 이동하는 데 걸리는 시간을 효과적으로 절감함으로써 페이지 반입 비용을 절감하였다. 실험 결과, 본 연구에서 제안한 기법은 평균 28.5%의 수행 시간 절감 효과와 4.4%의 페이징 시스템 에너지 절감 효과를 보였다.
비휘발성 메모리 기반 캐시의 쓰기 작업 최적화를 위한 캐시 시뮬레이터 설계
주용수,김명회,한인규,임성수,Joo, Yongsoo,Kim, Myeung-Heo,Han, In-Kyu,Lim, Sung-Soo 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.2
Nonvolatile memory (NVM) is being considered as an alternative of traditional memory devices such as SRAM and DRAM, which suffer from various limitations due to the technology scaling of modern integrated circuits. Although NVMs have advantages including nonvolatility, low leakage current, and high density, their inferior write performance in terms of energy and endurance becomes a major challenge to the successful design of NVM-based memory systems. In order to overcome the aforementioned drawback of the NVM, extensive research is required to develop energy- and endurance-aware optimization techniques for NVM-based memory systems. However, researchers have experienced difficulty in finding a suitable simulation tool to prototype and evaluate new NVM optimization schemes because existing simulation tools do not consider the feature of NVM devices. In this article, we introduce a NVM-based cache simulator to support rapid prototyping and evaluation of NVM-based caches, as well as energy- and endurance-aware NVM cache optimization schemes. We demonstrate that the proposed NVM cache simulator can easily prototype PRAM cache and PRAM+STT-RAM hybrid cache as well as evaluate various write traffic reduction schemes and wear leveling schemes.