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- 저자 : Xiaochen Duan (검색결과 2 건)
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Xiaochen Duan,Jingjing Hao,Yanliang Niu 대한전자공학회 2023 IEIE Transactions on Smart Processing & Computing Vol.12 No.6
This paper proposes a particle swarm optimization algorithm, error back propagation neural network, fuzzy inference system, and other non-linear method models with high fitting degree and accuracy to optimize the scientific and accurate decision-making of investment plans for international high-speed railway projects, solve the problems of lag, linearity, and simplicity in the current investment forecasting and decision-making methods, and maximize the economic and social benefits of investment, based on the mining of historical data of the full life cycle cost. These methods were suitable for the randomness, complexity, and non-linearity presented in the full life cycle of international high-speed rail investment. The investment plan decision-making of international high-speed railway construction projects was conducted. The investment error of the selected line construction stage was 1.85%, and the operating investment error from November 14, 2007, to now was 0.64%, which is within the allowable range of ±3%. The ratio of operating investment in the next 80 years to that in the first 20 years was five. The built model was applied to three alternative routes, and the predicted results according to the model were the same as the selected routes in the actual project.
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Low Cost Fabrication of UV Photodetector Based on Hexagonal Nanocrystal ZnO:Al/p-Si Heterojunction
Li Duan,Feng Wei,Jibin Fan,Xiaochen Yu,Wenxue Zhang,Yan Zhang,Fengni He,Xiaojiao Cheng,Ye Tian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
ZnO:Al/p-Si heterojunction was fabricated by depositing a hexagonal nanocrystal ZnO:Al film on p-type Si substrate using a simple chemical bath deposition (CBD) method. The vertically aligned hexagonal ZnO:Al nanocrystals reduce the grain boundary scattering and provide good conductivity. The ZnO:Al/Si heterojunction shows obvious photocurrent under ultraviolet (UV) illumination. A high UV-to-visible rejection ratio of the ZnO:Al/Si heterojunction indicates that the hexagonal nanocrystal ZnO:Al film is a good material for fabricating UV photodetectors. Furthermore, the response speed of the photodetector based on ZnO:Al hexagonal nanocrystal film is faster than that of most previously reported photodetectors based on ZnO:Al nanorods. We infer it is because the ZnO:Al nanocrystals film has a smaller surface to volume ratio than the ZnO:Al nanorod array.
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