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천연해수중 전착법에 의해 제작한 Calcareous 석출막의 형성구조와 방식특성
류한진,윤용섭,김기준,문경만,이명훈 한국해양대학교 해양과학기술연구소 2001 硏究論文集 Vol.10 No.1
A unique feature of cathodic protection in seawater is formation of calcareous deposit on cathodic metal surface. Deposits are a consequence of pH increase of the electrolyte adjacent to metal surfaces by cathodic current. Constitute of calcareous deposits are mainly calcium carbonate(CaCO3) and magnesium carbonate(Mg(OH)2). These deposits increase the "throwing power" of the cathodic protection system, increase the life of sacrifical anodes, reduce cathodic current requirement, and mitigate corrosion reactions when the cathodic current source is interrupted, But calcareous deposits cannot enough protect steel surface, because it is formed ununiformly on metal surface. Recently, electrodeposition technologys that enables steel structure surface to be protected like a coating methods have been studying in developed countries. But there are some problems in corrosion resistance for longtime, adhesion force, and strength between deposit and base metal. In this work, electrodeposit films were formed on steel substrates by electrodeposition technique in seawater. The effect of current density, coating time, and attachment of mesh were investigated during formation process of the electrodeposited films by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and X-ray Diffractor (XRD), Corrosion resistance of electrodeposits were investigated by potentiostat in seawater.
에지 영상을 이용한 MPEG 비디오의 점진적 장면전환 검출
류한진,유헌우,장동식 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(2)
In this paper, a new algorithm for dissolve scene change detection in MPEG frame sequences is proposed. The proposed algorithm is based on the fact that most of dissolve curves can be characterized by a variance distribution of edge information in the frame sequences. Average edge frame sequences are obtained by performing "sobel" edge detection twice. Features are extracted by comparing a variance with those of local blocks in the average edge frames. Those features are further processed by the opening operation to obtain a smoothing variance curve. The lowest variance in the local frame sequences is chosen as a dissolve detection point. Experimental results show that the proposed algorithm retrieves up to 18 dissolves in total 20 dissolves of some tested videos.