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- 저자 : Feifei Qin (검색결과 5 건)
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Feifei Qin,Han Zhao,Shengchao Zhen,Hao Sun,Yan Zhang 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.1
This study designs a control of two-degree of freedom lower limb rehabilitation robot (LLRR) for the patient who needs the proper physical therapy after a spinal cord injury (SCI), stroke, or a surgical operation. The robot manipulator can perform specified passive exercises as well as copy exercise motions and perform them without the physiotherapist. Specifically, the uncertainties including the model uncertainty, initial condition deviation and the external disturbance are also considered. Firstly, a unilateral man-robot dynamical model is proposed based on Lagrange method. Then, we propose a Lyapunov based robust control to suppress the effect of uncertainties. The control algorithm consists of a PD feedback component and a piecewise function component. Theoretical analysis is provided to demonstrate that the controller can guarantee the uniform boundedness and uniform ultimate boundedness of the system. Moreover, the joint angle trajectory of a healthy person is explicitly obtained by the experimental platform and used as the pre-specified trajectory of the LLRR. Finally, numerical simulation is presented to illustrate the effectiveness and the trajectory-tracking control performance of the control.
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Zou Feifei,Guo Qin,Shen Bo,Lv Yuan 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
Aedes albopictus with a worldwide distribution, has been a vector for more than 20 arboviruses such as dengue, chikugunya, Zika and West Nile, but insecticide resistance in A. albopictus has become more and more serious, as a result of improper application of pyrethroid insecticides for mosquito control. The P450 gene cluster is known to be involved in metabolic mechanisms of pyrethroid resistance in other mosquito species. However, little is known about metabolic resistance in field A. albopictus in China. In this study, we collected five different field strains and first revealed the larval and adult resistance status of A. albopictus to deltamethrin in Jiangsu province of China. A combination of comparative genomics and P450 gene cluster analysis was conducted to investigate the underlying CYP6-mediated metabolic resistance mechanisms against deltamethrin in these field mosquitoes. The significance of three CYP6 genes, AALF024122, AALF024124 and AALF018944 in deltamethrin resistance was identified in our study. Furthermore, RNA interference-mediated silencing of three genes all increased the sensitivity of mosquitoes to deltamethrin in vivo, showing that these genes may be viable biomarkers for pyre throid resistance management in field A. albopictus.
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Force Ripple Modeling and Minimizing of an Ironless Permanent-Magnet Linear Synchronous Motor
Shengchao Zhen,Panpan Chen,Xianmin Chen,Feifei Qin,Huixing Zhou 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.6
A force ripple model considering both non-ideal magnetic field and windings was developed to study methods for the suppression of the force ripple in an ironless permanent-magnet linear synchronous motor (PMLSM) to improve its low speed stability and position tracking performance. With this new model, which uses the d-q reference frame, the force ripple information could be calculated at discrete positions using the winding features and magnetic flux density (MFD). A PMLSM with two movers and one stator was designed to measure the air gap MFD and force ripple at different positions. The reliability of the model was validated through a comparison of the force ripple data obtained with the new model and practical measurements. The error ratio between the theoretical calculations and measured forces was less than ± 4%. Force constants were available from the model using the measured MFD, and these force constants were then used as force compensation coefficients to adjust the current in terms of the mover’s position. The force ripple, particularly the periodic force ripple causing resonance of the mechanical system, was significantly reduced with compensation. The theoretical analysis and experimental results show the effectiveness of the improved model.
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MODEL-BASED CONTROL OF SYNCHRONIZER SHIFTING PROCESS FOR TRAJECTORY TRACKING CONTROL
Yan Zhang,Han Zhao,Mingming Qiu,Feifei Qin,Bingzhan Zhang 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.4
A novel approach of the tracking control for synchronizer displacement is introduced in this paper. Based on modeling for the structure of synchronizer and shifting process, a shifting displacement tracking controller is designed by the Udwadia - Kalaba equation. The engagement rule of synchronizer combination sleeve is regarded as the trajectory constraint of the system, certain constraint force is imposed to follow this trajectory constraint, which could be obtained by the Udwadia- Kalaba equation without using Lagrange multiplier or other auxiliary variables. Specific comparative study with conventional PID control is discussed. Simulations and vehicle test results show that the shifting actuator can accurately track the desired trajectory determined by the upper layer control strategy, thus verify the effectiveness of the controller.
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Ci Dunwei,Tang Zhaohui,Ding Hong,Cui Li,Zhang Guanchu,Li Shangxia,Dai Liangxiang,Qin Feifei,Zhang Zhimeng,Yang Jishun,Xu Yang 한국미생물학회 2021 The journal of microbiology Vol.59 No.1
Peanut (Arachis hypogaea. L) is an important oil seed crop. Both arbuscular mycorrhizal fungi (AMF) symbiosis and calcium (Ca2+) application can ameliorate the impact of saline soil on peanut production, and the rhizosphere bacterial communities are also closely correlated with peanut salt tolerance; however, whether AMF and Ca2+ can withstand high-salinity through or partially through modulating rhizosphere bacterial communities is unclear. Here, we used the rhizosphere bacterial DNA from saline alkali soil treated with AMF and Ca2+ alone or together to perform high-throughput sequencing of 16S rRNA genes. Taxonomic analysis revealed that AMF and Ca2+ treatment increased the abundance of Proteobacteria and Firmicutes at the phylum level. The nitrogenfixing bacterium Sphingomonas was the dominant genus in these soils at the genus level, and the soil invertase and urease activities were also increased after AMF and Ca2+ treatment, implying that AMF and Ca2+ effectively improved the living environment of plants under salt stress. Moreover, AMF combined with Ca2+ was better than AMF or Ca2+ alone at altering the bacterial structure and improving peanut growth in saline alkali soil. Together, AMF and Ca2+ applications are conducive to peanut salt adaption by regulating the bacterial community in saline alkali soil.
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