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RISS 인기검색어
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- 저자 : Deqiang Chen (검색결과 3 건)
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Low-Rank Representation-Based Image Super-Resolution Reconstruction with Edge-Preserving
( Rui Gao ),( Deqiang Cheng ),( Jie Yao ),( Liangliang Chen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.9
Low-rank representation methods already achieve many applications in the image reconstruction. However, for high-gradient image patches with rich texture details and strong edge information, it is difficult to find sufficient similar patches. Existing low-rank representation methods usually destroy image critical details and fail to preserve edge structure. In order to promote the performance, a new representation-based image super-resolution reconstruction method is proposed, which combines gradient domain guided image filter with the structure-constrained low-rank representation so as to enhance image details as well as reveal the intrinsic structure of an input image. Firstly, we extract the gradient domain guided filter of each atom in high resolution dictionary in order to acquire high-frequency prior information. Secondly, this prior information is taken as a structure constraint and introduced into the low-rank representation framework to develop a new model so as to maintain the edges of reconstructed image. Thirdly, the approximate optimal solution of the model is solved through alternating direction method of multipliers. After that, experiments are performed and results show that the proposed algorithm has higher performances than conventional state-of-the-art algorithms in both quantitative and qualitative aspects.
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Wenqiang Sun,Deqiang Zhang,Xiang Chen,Keyan Wang,Jiqing Zhang,Yunjie Jia 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
Cold work dies (of Cr12MoV) surface of the WC/Ni composite coating prepared by laser cladding can be used to quickly repair worn areas of dies. The composition, hardness, fracture morphology, microstructure, and shear strength of the coating were characterized by microhardness tester, universal tensile testing machine, XRD, EDS, and SEM. The results show that the main phase of the coating is composed are M 23 C 6 , FeNi 3 , Cr 7 C 3 , WC, W 2 C, Cr 2 B, Fe 2 B, and W 2 B. The change of scanning speed only changes the diffraction peak, but has little effect on the internal structure and strengthening mechanism of the coating. With the decrease of scanning speed, the powder deposition density per unit time increases, and a large number of pores and unmelted particles are mixed in the coating, which weakens the bonding strength between the coating and the substrate, and the fracture mechanism of the coating changes from quasi-cleavage fracture to brittle fracture.
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Huan Liu,Nannan Lu,Xiaojun Wang,Xiaoshi Hu,Deqiang Chen 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3
In this study, the wear behaviors of the solution-treated and as-extruded SiCp/AZ91D metal matrix composites with differentsizes and volume fractions of SiC particles were systematically investigated under different wear test parameters. The SiCparticles exhibited a typical necklace-type distribution in the solution-treated composites and a homogeneous distributionin the as-extruded composites. Wear tests results showed that the wear rates of the as-extruded composites were lower thanthat of the solution-treated composites almost under all testing conditions and with the same SiC size and volume fraction. However, the dominant wear mechanisms for these two types of composites were different. The typical necklace-type distributionof SiCpin the solution-treated composites could effectively promote the occurrence of delamination owing to theweak bonding between SiCpand matrix in the particle aggregated regions. By contrast, as the bond between disperse SiCpand matrix was enhanced, the homogeneous distribution of SiCpin the as-extruded composites could promote the occurrenceof adhesion and prevent the occurrence of delamination. Moreover, a higher applied load and higher volume fraction of SiCpobviously promoted the progress of delamination for the solution-treated composites, while the extent of the adhesive wear forthe as-extruded composites was mainly associated with the increase of the applied load, sliding velocity and SiC particle size.
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