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Guilin Wang,Kun Yang,Yang Yang,Shaohua Zhang 한국자원공학회 2017 Geosystem engineering Vol.20 No.4
This study proposes a comprehensive simulation model that couples natural and human processes that have traditionally been simulated and analyzed independently. This model was established to support a risk assessment associated with natural disasters and social emergencies. In this paper, a driving mechanism was refined to reflect changes in the water environment and to understand the natural process of non-point source pollution formation in the Dianchi Lake basin. The land use and land cover model, incorporating the changes from the human activities and the natural process, was constructed to understand how humans affect the land use and land cover in the Dianchi Lake basin. Moreover, this paper studies the effects of land use and land cover changes on the non-point pollution and the urban non-point pollution with the SWAT and SWMM models. The land use and land cover changes, especially the growth and spread of the urban area, are changing the structure of the ecosystem and are degenerating the functions of the ecosystem. Ultimately, this study comprehensively simulated natural and human processes to analyze the effects of the human activities on water environment.
Chi Zhang,Xiaolu Huang,Miao Yang,Si-Lu Chen,Jinhua Chen,Guilin Yang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.3
A long-stroke nano-positioning stage driven by voice coil actuator (VCA) and supported by flexure guide is designed in this paper. The Halbach permanent magnet array is implemented in the VCA to improve the air-gap flux density with the magnetic concentration effect. The air-gap magnetic fi eld is modeled with an equivalent magnetic structure and verified by finite element analysis. The proposed equivalent magnetic structure reduces the number of boundary condition equations and hence simplifies the analysis procedure. Besides, a novel spring-damping tuning method is proposed based on the equivalent dynamic model of the closed-loop system. This tuning method regards P control and D control as a virtual spring and a virtual damper. The controller parameters are tuned in an intuitive way. Experimental results show that the positioning stage is capable of achieving a resolution of 40 nm within a stroke of 0.8 mm with high repeatability. The spring-damping tuning method ensures better control performance compared to Ziegler Nichols (Z–N) tuning method where overshoot and settling time are decreased.
Detecting small lung tumors in mouse models by refractive-index microradiology
Chien, Chia-Chi,Zhang, Guilin,Hwu, Y.,Liu, Ping,Yue, Weisheng,Sun, Jianqi,Li, Yan,Xue, Hongjie,Xu, Lisa X.,Wang, Chang Hai,Chen, Nanyow,Lu, Chien Hung,Lee, Ting-Kuo,Yang, Yuh-Cheng,Lu, Yen-Ta,Ching, Y Springer-Verlag 2011 ANALYTICAL AND BIOANALYTICAL CHEMISTRY Vol.401 No.3
Xiao Lu,Yuanyu Cai,Guilin Zhang,Hongxia Wang,Haixia Wang,Xiao Liang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5
This paper considers optimal control problem for networked control systems (NCSs) with Markovian packet dropouts. Since previous literatures generally consider the one-way Markovian packet dropouts, i.e., from the sensor to the estimator or from the controller to the actuator. To make a further study of this issue, we aim to give the complete solution to the control problem of the two-way Markovian packet dropouts, i.e., from the sensor to the estimator and from the controller to the actuator. Firstly, by applying the Pontryagin’s maximum principle and mathematical induction method, a solution to the forward and backward stochastic difference equations (FBSDEs) is derived. Secondly, in virtue of the solution to the FBSDEs, we obtain the necessary and sufficient condition for the optimal control problem. Thirdly, the optimal controller is given based on the complete square method. Finally, numerical examples are proposed to illustrate the effectiveness of the theoretical results.
Xuerui Wan,Runxia Yang,Guilin Liu,Manling Zhu,Tianliang Zhang,Lei Liu,Run Wu 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.2
Cellular prion protein (PrPC) is ubiquitously expressed in the cytomembrane of a considerable number of eukaryotic cells. Although several studies have investigated the functions of PrPC in cell proliferation, cell apoptosis, and tumorigenesis of mammals, the correlated functions of chicken PrPC (chPrPC) remain unknown. In this study, stable chPrPC-downregulated Marek’s disease (MD) virus-transformed avian T cells (MSB1-SiRNA-3) were established by introducing short interfering RNA (SiRNA) targeting chicken prion protein genes. We found that downregulation of chPrPC inhibits proliferation, invasion, and migration, and induces G1 cell cycle phase arrest and apoptosis of MSB1-SiRNA-3 cells compared with Marek’s disease virus-transformed avian T cells (MSB1) and negative control cells. To the best of our knowledge, the present study provides the first evidence supporting the positive correlation between the expression level of chPrPC and the proliferation, migration, and invasion ability of MSB1 cells, but appears to protect MSB1 cells from apoptosis, which suggests it functions in the formation and development of MD tumors. This evidence may contribute to future research into the specific molecular mechanisms of chPrPC in the formation and development of MD tumors.
Application of copper sulfate based fenton-like catalyst in degradation of quinoline
Zhaojie Jiao,Haifeng Gong,Ye Peng,Guilin Zhou,Xianming Zhang,Xu Gao,Yunqi Liu 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.5
In the practical application of water treatment, the Fenton reaction usually works at a lower pH. To overcome the above shortcomings, a Fenton-like reaction system with copper sulfate as a catalyst was proposed. In this paper, quinoline was used as the target pollutant and the effects of catalyst dosage, H₂O₂ dosage, reaction temperature, and initial concentration of quinoline and pH on the removal effect were investigated, and the evolution in pH and hydroxyl radical concentration during reaction, as well as the possible catalytic mechanism and degradation pathway were clarified. The results show that under a catalyst dosage of 0.4 g・L<SUP>-1</SUP>, a H₂O₂ dosage of 196 mmol・L<SUP>-1</SUP>, a quinoline concentration of 100 mg・L<SUP>-1</SUP> and a temperature of 75°C, the removal of quinoline and total organic carbon (TOC) reaches 99.5% and 87.2% in 65 min, respectively. Furthermore, the copper sulfate-driven homogeneous Fenton system exhibits a superior adaptability to pH in the range of 3.8 to 8.8. In the degradation of quinoline, ·OH radicals may attack the nitrogen ring and the benzene ring in sequence. The work provides a technical support for the treatment of organic wastewater, and shows promising in practical applications.
Research on High-Frequency Isolation Type of Dual-PWM Variable Frequency Speed Regulation
Liu Jiangong,Liu Wenzhuang,Wang Yiying,Zhang Guilin,Chen Longfei 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
Frequency converters are widely used in power grids, motor speed regulation, and other fields. When the voltage level is above low voltage and the workspace is limited, traditional frequency converters mostly adopt the power frequency transformer to connect to the power grid. But the structure has the problems of bigger volume and complexity. To solve these problems, this paper proposes a three-stage topology structure of high-frequency isolation type of dual-PWM variable frequency speed regulation based on three-phase rectification, single active isolated DC/DC converter, and three-phase inverter, and analyzes its power transmission characteristics in detail. And a new method that combines high-frequency electrical isolation and frequency conversion is discussed. Then, the control strategies of the new method are also described. Lastly, simulation and experiment are constructed to verify the new design method is correct and feasible, and that the steady and dynamic characteristics of the three-stage high-frequency isolated frequency converter are better.