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- 저자 : Gao Junchang (검색결과 2 건)
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Junchang Zhai,Liqun Gao,Steven Li 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
This paper presents a new approach to the problem of robust pole assignment in a circular region usingnovel global harmony search (NGHS) algorithm. Based on geometric principles, the position information of polesin the circular region is depicted and the rules of dynamic selection of poles from the circular region are determined. This ensures the algorithm select poles dynamically from the circular region. In order to get a set of poles and thestate feedback controller which allow the system to have a maximum allowable perturbation or uncertainty, theupper bound of perturbation or uncertainty is optimized by the NGHS algorithm for the poles in the circular region. In contrast to most existing methods, an optimization method using NGHS algorithm for the dynamic selectionof poles, makes the closed-loop system show better robustness. Finally, the simulation results demonstrate theeffectiveness of the proposed approach.
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Fu Hao,Chen Guang,Gao Junchang,Wu Yadong,Tao Xin,Huang Youguo 한국탄소학회 2024 Carbon Letters Vol.34 No.5
The thermal conductivity (TC) of graphene-based/metal composites is currently not satisfactory because of the existence of large interfacial thermal resistance between graphene and metal originating from the strong scattering of phonons. In this work, 6063Al-alloy-based reduced graphene oxide (rGO) composite with strong covalent bonds interface was prepared via self-assembly, reduction, and electrophoresis-deposition processes by using 3-aminopropyl triethoxysilane (APTS) as a link agent. Structural characterizations confirmed the successful construction of strong Al-O-Si-O-C covalent bonds in the as-prepared 6063Al-Ag-APTS-rGO composite, which can promote the transfer of phonons in the interface. Benefiting from the unique structure, 6063Al-Ag-APTS-rGO (214.1 W/mK) showed obviously higher cross-plane TC than 6063Al (195.6 W/mK). Comparative experiments showed that 6063Al-Ag-APTS-rGO has better cross-plane TC than 6063Al/Ag/APTS/rGO (196.6 W/mK) prepared via physical mixing of stirring process, evidencing the significance of electrophoresis-deposition (EPD) process on constructing strong covalent bonds for improving the heat dissipation performance. Besides, the effects of different rGO contents and test temperature on the TC of the composites and their corrosion resistance were also discussed. This work demonstrated a feasible strategy for the construction of metal–carbon interface composite with improved thermal performance.
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