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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.
Chunfeng Wang,Jun Yang,Guilin Liu,Hong Gao,Meiling Chen 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.4
This study aims to reveal the changes in the microstructure of hypoeutectic gray cast iron under the addition of compositesilicon carbide powder of different mass fractions, and to explore how modified silicon carbide (SiC) particles of different sizesand contents improve the mechanical properties of hypoeutectic gray cast iron. The results showed that the modified SiCparticles increased the nucleation, the undercooling and microstructure of hypoeutectic gray cast iron, and the tensile strengthof the iron at room temperature was increased by 18,28%. The present work solves the problem that traditional SiC ceramicparticles are prone to agglomeration in molten metal, analyzes its action mechanism, and can expand the application of SiCceramic particles to strengthening metal properties of casting materials.
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.
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
Pattern Recognition of Partial Discharge in Power Transformer Based on InfoGAN and CNN
Lv Fangcheng,Liu Guilin,Wang Qiang,Lu Xiuquan,Lei Shengfeng,Wang Shenghui,Ma Kang 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
As an important equipment in the power system, it has a significant meaning in scientifically diagnosing the insulation state of oil-immersed power transformers. At present, the pattern recognition of partial discharge (PD) in a transformer has the problem of the insufficient generalization ability of the classifier due to scarcity and imbalance of samples, resulting in low recognition accuracy. To solve this problem, this paper proposes a pattern recognition of the PD method based on information maximizing generative adversarial nets (InfoGAN) and convolutional neural networks. In this method, phase-resolved partial discharge (PRPD) maps, constructed from pulse current waveforms, are chosen as the training samples. First, the InfoGAN is trained to generate new samples which expanded the original sample database, then various classifiers are trained by using the expanded sample database to realize the pattern recognition. Results of the test show that the proposed method can generate new highly similar samples more stable than other data enhancement methods, and effectively enrich the data diversity. In addition, the classifier trained by the expanded sample database has better generalization ability and is applicable to different classifiers, while residual network 18 has the highest recognition rate of 99.0%. This method can effectively balance and expand PRPD samples, and improve the recognition accuracy of the classifier to a certain extent. It has a good application prospect in PD diagnosis engineering.
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.