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Finite-time Control for a Class of Networked Control Systems with Short Time-varying Delays and Sampling Jitter

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International Journal of Automation and computing 2015年第4期12卷 448-454页

作者： chang-chun hua Shao-Chong Yu Xin-Ping Guan Department of Electrical Engineering University of Yanshan Department of Automation Shanghai Jiaotong University

This paper is concerned with the finite-time control problem for a class of networked control systems(NCSs) with short time-varying delays and sampling *** a state feedback controller,the closed-loop NCS is described as a discrete-time linear system model,and the uncertain parts reflect the effect of the the network-induced delays and short sampling jitter of the system *** a robust approach is proposed to solve the finite-time stability and stabilization problems for the considered *** illustrative example is provided to demonstrate the effectiveness of the proposed theoretical results.

关键词： Networked control system(NCS) time-varying delay sampling jitter finite-time stability state feedback.

Modeling and Control for Wireless Networked Control System

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International Journal of Automation and computing 2011年第3期8卷 357-363页

作者： chang-chun hua Ying Zheng Xin-Ping Guan Department of Electrical Engineering Yanshan University Qinhuangdao 066004 PRC Department of Automation Shanghai Jiao Tong University Shanghai 20024 PRC

In this paper, the stabilization problem is considered for the class of wireless networked control systems （WNCS）. An indicator is introduced in the WNCS model. The packet drop sequences in the indicator are represented as states of a Markov chain. A new discrete Markov switching system model integrating 802.11 protocol and new scheduling approach for wireless networks with control systems are constructed. The variable controller can be obtained easily by solving the linear matrix inequality （LMI） with the use of the Matlab toolbox. Both the known and unknown dropout probabilities are considered. Finally, a simulation is given to show the feasibility of the proposed method.

关键词： Wireless networked control systems (WNCS) packet dropout sequences controller network scheduling stability.

Extended-state-observer-based robust torsional vibration suppression for rolling mill main drive system with input saturation

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Journal of Iron and Steel Research International 2023年第5期30卷 985-993页

作者： Jia-qiang Chen Shu-zong Chen chang-chun hua Cheng Jia Cheng Qian Institute of Electrical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina

A robust torsional vibration suppression strategy is proposed for the main drive system of the rolling mill subject to uncertainties,disturbances and input *** given model information incorporated into observer design,an extended state observer that relies only on roller speed measurements is developed to estimate the system states and lumped uncertainties of the rolling mill main drive *** handle the motor torque saturation,an auxiliary signal system with the same order as the plant is *** error between the control input and plant input is taken as the input of the constructed auxiliary system,and a number of signals are generated to compensate for the effect of the motor torque ***,a robust output feedback controller is introduced to obtain better transient and steady-state performance of the rolling mill main drive system and the stability of the closed-loop system is strictly proved via Lyapunov ***,comparative simulations are performed to verify the effectiveness and superiority of the proposed control strategy.

关键词： Rolling mill Main drive system Vibration suppression Extended state observer Input saturation

Event-Triggered Synchronization Control for Chaotic Lur’e Systems with Time Delays

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Event-Triggered Synchronization Control for Chaotic Lur’e S...

A Study of BCI Signal Pattern Recognition by Using Quasi-Newton-SVM Method

第37届中国控制会议

作者： Ru Bai Kuo Li chang-chun hua Department of Automation School of Electrical EngineeringYanshan University

In this paper,an event-triggered synchronization control scheme is developed for a class of chaotic Lur’e systems with time delays.A novel Lyapunov-Krasovskii functional（LKF） is designed to extend the sampling period of the ***,an improved event-triggered mechanism is constructed to decrease the amounts of communication between controller and sensor,and the numbers of controller *** on the Lyapunov stability theory,it is proved strictly that the chaotic Lur’e systems are asymptotically stable with the proposed ***,a numerical simulation is presented to illustrate the effectiveness of the event-triggered synchronization control strategy.

关键词： Event-triggered control sampled-data control time-delays synchronization control chaotic Lur’e systems

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Chinese Journal of Biomedical Engineering(English Edition) 2006年第4期15卷 171-177页

作者： YANG chang-chun MA Zheng-hua SUN Yu-qiang ZOU Ling Department of Computer Science and Technology Jiangsu Polytechnic University213164 JiangsuChina Department of Computer Science and TechnologyJiangsu Polytechnic University213164 JiangsuChina Department of Computer Science and TechnologyJiangsu Polytechnic University213164 JiangsuChina Department of Computer Science and TechnologyJiangsu Polytechnic University213164 JiangsuChina

The recognition of electroencephalogram (EEG) signals is the key of brain computer interface (BCI). Aimed at the problem that the recognition rate of EEG by using support vector machine (SVM) is low in BCI, based on the assumption that a well-defined physiological signal which also has a smooth form "hides" inside the noisy EEG signal, a Quasi-Newton-SVM recognition method based on Quasi-Newton method and SVM algorithm was presented. Firstly, the EEG signals were preprocessed by Quasi-Newton method and got the signals which were fit for SVM. Secondly, the preprocessed signals were classified by SVM method. The present simulation results indicated the Quasi-Newton-SVM approach improved the recognition rate compared with using SVM method; we also discussed the relationship between the artificial smooth signals and the classification errors.

关键词： Brain-computer interface (BCI) EEG Support vector machine (SVM) Quasi-Newton method

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新疆主要城市城市化水平及其发展对策

干旱区资源与环境 2006年第4期20卷 102-107页

作者：温江熊黑钢常春华新疆大学资源与环境科学学院乌鲁木齐830046 干旱半干旱可持续发展国际研究中心新疆绿洲生态重点实验室

本文选取了经济城市化、产业结构城市化、人口城市化、生活质量城市化四个一级指标以及其下层的十三个二级子指标构成了新疆各主要城市城市化水平测度的指标体系。通过层次分析法(AHP)以及德尔菲法(Delphi)来确定各指标的权重,根据多指... 详细信息

本文选取了经济城市化、产业结构城市化、人口城市化、生活质量城市化四个一级指标以及其下层的十三个二级子指标构成了新疆各主要城市城市化水平测度的指标体系。通过层次分析法(AHP)以及德尔菲法(Delphi)来确定各指标的权重,根据多指标综合评价模型得出新疆主要城市城市化水平。依据各市的城市化水平进行聚类,并根据聚类结果将新疆19个主要城市分为五个层次:第一层次:克拉玛依和乌鲁木齐,城市化水平最高;第二层次:库尔乐、哈密、奎屯、昌吉、伊宁、石河子、喀什,城市化水平较高;第三层次:阜康、米泉、城市化水平中等;第四层次:塔城、博乐、和田、阿克苏、阿勒泰、吐鲁番和乌苏,城市化水平较低;第五层次:阿图什,城市化水平最低。同时,城市化水平的空间分布不平衡。针对各城市城市化水平的层次性和区域不平衡性提出了城市今后发展相应的对策。

关键词：城市化水平产业结构工业化

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新疆各城市城市化水平比较研究

干旱区资源与环境 2007年第2期21卷 27-31页

作者：常春华熊黑钢温江新疆大学资源与环境科学学院新疆绿洲生态重点实验室乌鲁木齐830046

城市化是经济、社会发展的产物,越来越引起广泛的关注。因而,对城市化发展进行客观、综合评价就显得十分必要。本文通过构建新疆各城市城市化水平指标体系,使用层次分析法(AHP)以及德尔菲法(Delphi)来确定各指标的权重,采用多指标综合... 详细信息

城市化是经济、社会发展的产物,越来越引起广泛的关注。因而,对城市化发展进行客观、综合评价就显得十分必要。本文通过构建新疆各城市城市化水平指标体系,使用层次分析法(AHP)以及德尔菲法(Delphi)来确定各指标的权重,采用多指标综合评价模型对新疆19个城市的城市化水平作出比较评价。依据评价结果,对新疆各城市的城市化水平作了阶段性分析,找出了各阶段的变化特点及各城市的发展状况。据此,总结了新疆城市化发展的特点,并提出了各个城市应看清楚各自城市的优势和差距,以利于其在城市发展方面扬长避短,充分利用西部大开发提供的各方面优惠政策,制定相应对策促进其经济、社会、环境的全面发展。

关键词：城市化水平评价分析比较研究

Novel IGBT SPICE Model with Non-destructive Parameter Extraction and Comparison with Measurements

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Semiconductor Photonics and Technology 2002年第3期8卷 157-165页

作者： YUAN Shou cai, ZHU chang chun, LIU Jun hua (School of Electron. and Inform. Eng., Xi’an Jiaotong University, Xi’an 710049, CHN) School of Electron. and Inform. Eng. Xi'an Jiaotong University Xi'an 710049

A subcircuit based model for the insulated gate bipolar transistor(IGBT) is proposed and optimized. The IGBT wide base conductivity modulated resistor is effectively equivalent by using a voltage controlled resistor. Based on analytical equation describing the semiconductor physics, the model parameters are extracted accurately via measured data without device destruction. Employing the MOS level 8 SPICE model, the proposed IGBT subcircuit model gives more simulation accuracy and easy convergence, the simulation results are verified by comparison with measured results.

关键词： IGBT Model SPICE Simulation VDMOSFET

新型职业农民培育影响因素及其精准培育研究——基于7省21县(市、区)63乡(镇)的调研数据

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江西财经大学学报 2018年第3期 86-94页

作者：徐辉许泱李红常春华长江大学湖北农村发展研究中心湖北荆州434023 湖北科技学院经济与管理学院湖北咸宁437100

新型职业农民的培育存在多种影响因素,有针对性地精准培育新型职业农民是打造高素质现代农业生产经营者队伍的关键所在。通过对全国7省21县(市、区)63乡(镇)1512个农民的调研获取第一手数据,并采用Logit二元回归模型实证分析5大类30项... 详细信息

新型职业农民的培育存在多种影响因素,有针对性地精准培育新型职业农民是打造高素质现代农业生产经营者队伍的关键所在。通过对全国7省21县(市、区)63乡(镇)1512个农民的调研获取第一手数据,并采用Logit二元回归模型实证分析5大类30项指标对新型职业农民培育的作用。结果表明,"是否经常自学农业技术和管理知识"等18个因素对新常态下新型职业农民培育具有显著性影响。因此,应在充分尊重农民职业意愿的基础上,优先遴选出受教育程度高,特别是农业大中专毕业生,为他们提供发展平台和推出配套政策,最终培育出优质的新型职业农民,并让他们获得较高的职业收益,扎根农村发展。

关键词：新型职业农民职业农民培育影响因素