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RISS 인기검색어
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- 저자 : Qingshan Zheng (검색결과 4 건)
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Zheng Li,Qingshan Zhang,Jinfeng An,Huixian Liu,Hexu Sun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3
When the dual-axis linear motor is processing components, its accuracy will be affected by the uncertainty and nonlinearity of the system, and the complexity of the processing curve trajectory. The goal is to improve the machining accuracy and response speed of the XY dual-axis permanent magnet synchronous linear motor two-dimensional platform, improve the anti-interference ability, and reduce the contour error. This paper proposes a coupled control method based on dual closed-loop single-axis high-order terminal sliding mode position control (TSMC). First, an improved mathematical model of equivalent contour error is established. Combine the coordinated controller to get the coupling link. Then, to accelerate error convergence and suppress chattering, a high-order terminal sliding mode controller is designed. The single-axis current controller is designed using high-order sliding mode algorithms. Simulations and experiments show the effectiveness and feasibility of the proposed method.
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Yuqi Wang,Qingshan Xu,Jiaqi Zheng 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.4
The speed of one-time power fl ow calculation is hard to be further improved with satisfi ed accuracy and stability after decades of researches. However, the improvement on many-times calculation speed may be possible and is important for practical application. This paper proposes a novel method which can dramatically improve the many-times calculation speed of power fl ow without sacrifi ce of accuracy, convergence and stability in DC power systems. To achieve the purpose, this paper adopts a novel basic technique to separate the computation loads of grid topology analysis and bus types analysis from power fl ow equations. The technique is based on the analysis of linear relationships-based nonlinear problems and strict mathematical derivations. Combined with the basic technique, a correctness method is also proposed to deal with the specifi c nonlinear factors in power fl ow calculation. Thus, a complete novel power fl ow calculation method is proposed and the detailed mathematical derivation is presented. With the novel ant lion optimizer, the proper DC test systems are constructed. Compared with classical Newton–Raphson method, the proposed method is more stable and the initial values requirement is lower. At last, the numerical verifi cation validates that the speed of the proposed method can be more than 10 times faster than Newton–Raphson method without the sacrifi ce of other performance.
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Expression Profile of Neuro-Endocrine-Immune Network in Rats with Vascular Endothelial Dysfunction
Lujin Li,Yiling Wu,Qingshan Zheng,Zhenghua Jia,Ling Xu 대한약리학회 2014 The Korean Journal of Physiology & Pharmacology Vol.18 No.2
This study was to determine the correlation between endothelial function and neuro-endocrineimmune(NEI) network through observing the changes of NEI network under the different endothelialdysfunction models. Three endothelial dysfunction models were established in male Wistar rats afterexposure to homocysteine (Hcy), high fat diet (HFD) and Hcy+HFD. The results showed that therewas endothelial dysfunction in all three models with varying degrees. However, the expression of NEInetwork was totally different. Interestingly, treatment with simvastatin was able to improve vascularendothelial function and restored the imbalance of the NEI network, observed in the Hcy+HFD group. The results indicated that NEI network may have a strong association with endothelial function, andthis relationship can be used to distinguish different risk factors and evaluate drug effects.
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Expression Profile of Neuro-Endocrine-Immune Network in Rats with Vascular Endothelial Dysfunction
Li, Lujin,Jia, Zhenghua,Xu, Ling,Wu, Yiling,Zheng, Qingshan The Korean Society of Pharmacology 2014 The Korean Journal of Physiology & Pharmacology Vol.18 No.2
This study was to determine the correlation between endothelial function and neuro-endocrine-immune (NEI) network through observing the changes of NEI network under the different endothelial dysfunction models. Three endothelial dysfunction models were established in male Wistar rats after exposure to homocysteine (Hcy), high fat diet (HFD) and Hcy+HFD. The results showed that there was endothelial dysfunction in all three models with varying degrees. However, the expression of NEI network was totally different. Interestingly, treatment with simvastatin was able to improve vascular endothelial function and restored the imbalance of the NEI network, observed in the Hcy+HFD group. The results indicated that NEI network may have a strong association with endothelial function, and this relationship can be used to distinguish different risk factors and evaluate drug effects.
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