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H.264 표준에서 양자화 계수를 고려한고속 인터모드 결정 방법
김근용,호요성 대한전자공학회 2006 電子工學會論文誌-SP (Signal processing) Vol.43 No.6
The recent video coding standard H.264 employs the rate-distortion optimization (RDO) method for choosing the best coding mode; however, it causes a large amount of encoding time. Thus, in order to reduce the encoding time, we need a fast mode decision algorithm. In this paper, we propose a fast inter mode decision algorithm considering quantization parameter (QP). The occurrence of best modes depends on QP. In order to reflect these characteristics, we consider the coded block pattern (CBP) which has 0 value when all quantized discrete cosine transform (DCT) coefficients are zero. We also use the early SKIP mode decision and early 16×16 mode decision methods. By computer simulations, we have verified that the proposed algorithm requires less encoding time than the fast inter mode decision method of the H.264 reference software for the Baseline and Main profiles by 19.6% and 18.8%, respectively. 최근에 만들어진 비디오 압축 표준인 H.264는 매크로블록당 최적의 부호화 모드를 결정하기 위해 비트율-왜곡 (rate-distortion) 기법을 사용하지만, 그 복잡성으로 인해 부호화하는 데 많은 시간이 걸린다. 따라서, H.264의 부호화 시간을 단축하기 위해 고속 모드결정 방법이 필요하다. 본 논문에서는 양자화 계수에 따라 발생 모드가 변하는 특성에 기반하여 불필요한 움직임 예측 및 모드결정 과정을 생략하는 새로운 고속 모드결정 방법을 제안한다. 양자화 계수에 따라 최적모드의 발생 빈도가 변하게 되는데, 제안한 방법에서는 매크로블록의 양자화된 이산 여현변환 계수들이 모두 0일 때, 0의 값을 가지는 CBP (coded block pattern)를 고려하여 이러한 특성을 반영하며, 조기 SKIP 모드 결정방법과 조기 16×16 모드 결정방법을 이용한다. 컴퓨터 모의실험을 통해, 본 논문에서 제안한 고속 인터모드 결정방법이 H.264의 참조 소프트웨어에 구현된 고속 인터모드 결정방법에 비해, Baseline 프로파일의 경우 19.6%, Main 프로파일의 경우 18.8%의 부호화 시간을 감소시키는 것을 확인했다.
김근용,방인철 한국유전학회 2012 Genes & Genomics Vol.34 No.1
The genus Koreocobitis (Teleostei; Cypriniformes; Cobitidae)is endemic to Korea and consists of two species. Koreocobitis naktongensis was recently separated from Koreocobitis rotundicaudata and erected as a novel species based on distinct morphological differences. Additionally, they show disjunctive separation in biogeography; K. rotundicaudata inhabits only the Han River drainage of the East Korea Subdistrict, and K. naktongensis is found only in the Nakdong River drainage of the South Korea Subdistrict. We determined the complete mitogenomic sequences of these two species to evaluate their phylogenetic position and to estimate the speciation time inferred from the partitioned nucleotide matrix of concatenated mitochondrial genes. The phylogenetic analysis revealed that the two Koreocobitis species consistently branched out together and formed a monophyly with Misgurnus species, with high statistical support within the cobitid lineage. The speciation time between the two Koreocobitis species was estimated to be 18.8 ± 3.7 million years ago (Mya), which is quite younger than that between two subdistrict populations of Coreoleuciscus splendidus showing the identical biogeographical separation pattern (ca. 31.2 Mya). These results indicate that the Noryeong/Sobaek Mountain Ranges functioned as an apparent vicariant barrier that not only allowed speciation of the Koreocobitis species but also contributed to the high genetic differentiation of C. splendidus populations for such a long period of time.
에콜로지 디자인 컨셉에 의한 노인용(老人用)조명기구 디자인에 관한 연구
김근용,조성대 順天靑巖大學 2001 論文集-順天靑巖大學 Vol.25 No.-
This research investigates appearance motive and design direction, and present condition etc. of Ecology design through literature, and wish to present future design that apply to lighting fixtures using by old mans. Also, study together basic principle of lighting, history of lighting design, Life Style of Target etc. that need in lighting design. Specific method of study is as following. 1. Study fundamental theory connected with light such as effect that special quality of light which is basic principle, illumination, surrounding that need lighting, effect that lighting shudders in our eye, lighting of lighting design get in human's mind. 2. Study about design characteristic and background age that arrange making of lighting design to regiment and do so that create design at that time. 3. Study about origin of Ecology design and organization background and forward direction and present condition. 4. Analyze direction of future lighting design that do to reflect Ecology design to lighting fixtures for old man and study element that must consider lie-style analysis with user and this design. 5. In conclusion, direction presentation that design must go forward hereafter and present lighting fixtures for old man by idea sketching and rendering the future design with data that analyze research so far.
김근용 順天靑巖大學 2001 論文集-順天靑巖大學 Vol.25 No.-
Analogized conclusion on the basis of literature research in this research. Literature research First. Research about necessity of advertisement type classification and experienced advertisement type classification, and arrange and summarized about F.C.B model. Second, investigated visual impact characteristic and type. So, F.C.B model of 1. informative, 2. affective, 3. habitual formation, 4. self-satisfaction, Substitute visual impact type by four goods classifications, and selecting typical goods 3 in each type. By analogize and conjecture visual impact techniques, wished to solve subject of study.
김근용,허정수,문성용,김근식,최정화,유준택 한국하천호수학회 2021 생태와 환경 Vol.54 No.3
Pacific herring, Clupea pallasii, a keystone species with significant ecological and commercial importance, is declining globally throughout much of its range. While traditional fishing equipment methods remain limited, new sensitive and rapid detection methods should be developed to monitor fisheries resources. To monitor the presence and quantity of C. pallasii from environmental DNA (eDNA) extracted from seawater samples, a pair of primers and a TaqMan® probe specific to this fish based on mitochondrial cytochrome b (COB) sequences were designed for the real-time PCR (qPCR) assay. The combination of our molecular markers showed high specificity in the qPCR assay, which affirmed the success of presenting a positive signal only in the C. pallasii specimens. The markers also showed a high sensitivity for detecting C. pallasii genomic DNA in the range of 1 pg~100 ng rxn-1 and its DNA plasmid containing COB amplicon in the range of 1~100,000 copies rxn-1, which produced linear standard calibration curves (r2 = 0.99). We performed a qPCR assay for environmental water samples obtained from 29 sampling stations in the southeastern coastal regions of South Korea using molecular markers. The assay successfully detected the C. pallasii eDNA from 14 stations (48.2%), with the highest mean concentration in Jinhae Bay with a value of 76.09±18.39 pg L-1 (246.20±58.58 copies L -1). Our preliminary application of molecular monitoring of C. pallasii will provide essential information for efficient ecological control and management of this valuable fisheries resource.