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- 저자 : Yu Yandong (검색결과 2 건)
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Yuge Yao,Yandong Yu,Yang Nie 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.9
The degradation and restoration of image are very important and widely studied in the field of computer visualization and image processing. The key of image restoration is to analyze the cause of image degradation, and to establish a reasonable model. The cause of image degradation is described by reasonable degradation model and specific parameters. In this paper, the linear image degradation model and common image restoration methods are described, and the system of image degradation model and image restoration is built. The simulation results show that the system of image degradation and restoration using Model-Based Design (MBD) methodology is not only efficient and simple, and convenient for hardware implementation.
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Fabrication of High-Strength Mg–Gd–Nd–Zn–Sn–Zr Alloy via Extrusion and Aging
Yan Zehua,Yu Yandong,Qian Jiahao,Luo Junting,Sang Yanchao 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
A high-strength Mg–9Gd–3Nd–1Zn–1Sn–0.5Zr (wt%) alloy bar was successfully fabricated by extrusion and followingaging two-steps processes, during which the alloy′s microstructures were determined to investigate the refinement mechanismduring extrusion and to reveal the morphology precipitation behavior of the as-extruded alloy after aging. Based on thecharacterization of the mechanical properties, the strengthening mechanism of the alloy under different treatment processeshad been discussed. Our results showed that the greater the extent of extrusion, the finer the grains and eutectic phase, andcrushing and dynamic recrystallization are the refinement mechanisms of the alloy in narrow-zone. After peak-aged treatmentat 200 °C, a large number of spherical β′ phase and lamellar precipitated phase had been observed, which replacesthe amorphous β" phase of the alloy was under-aged. The ultimate tensile strength, yield strength, and elongation were462.12 MPa, 391.97 MPa, and 4.2% respectively, and the increase number of the β′ phase and long-period stacking ordered(LPSO) phase were the reason why the strength of the alloy reached the highest value. At the over-aging stage (96 h), thesize of the lamellar precipitates and the LPSO was larger than that of the peak-aged, and the spherical β′ phase appeared inpeak-aging stage decreased significantly, which reduced its performance.
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