检索结果-内蒙古大学图书馆

arXiv 2022年

作者： Wang, Zhe Wang, Yongxiong Hu, Chuanfei Yin, Zhong Song, Yu School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology China Key Laboratory of Measurement and Control of CSE Ministry of Education Southeast University China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology China

Both the temporal dynamics and spatial correlations of Electroencephalogram (EEG), which contain discriminative emotion information, are essential for the emotion recognition. However, some redundant information within the EEG signals would degrade the performance. Specifically, the subjects reach prospective intense emotions for only a fraction of the stimulus duration. Besides, it is a challenge to extract discriminative features from the complex spatial correlations among a number of electrodes. To deal with the problems, we propose a transformer-based model to robustly capture temporal dynamics and spatial correlations of EEG. Especially, temporal feature extractors which share the weight among all the EEG channels are designed to adaptively extract dynamic context information from raw signals. Furthermore, multi-head self-attention mechanism within the transformers could adaptively localize the vital EEG fragments and emphasize the essential brain regions which contribute to the performance. To verify the effectiveness of the proposed method, we conduct the experiments on two public datasets, DEAP and MAHNOB-HCI. The results demonstrate that the proposed method achieves outstanding performance on arousal and valence classification. Copyright © 2022, The Authors. All rights reserved.

关键词： Emotion Recognition

来源：评论

学校读者我要写书评

暂无评论

Application of Improved Canny Algorithm in Image of Surgical Instruments 17

Application of Improved Canny Algorithm in Image of Surgical...

引用

17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： Liu, Hongli Lu, Kuan Shao, Lei Li, Ji Tianjin University of Technology Binshui Xidao Tianjin Key Laboratory for Control Theory Applications in Complicated Systems Xiqing District Tianjin300384 China

ISBN: (纸本)9781728164151

In order to improve the inventory efficiency of surgical instruments, a vision system needs to be installed. The edge detection of the image of surgical instruments is an important step to inventory surgical instruments. However, due to the wide variety of surgical instruments and the different sizes, it is necessary to improve the existing edge detection algorithm to satisfy the actual needs. Canny algorithm has been successfully applied in many computer vision systems, but it needs to be set manually when selecting high-low thresholds, it has poor adaptability and relies on human experience, so it cannot be directly applied to edge detection of surgical instruments. In this paper, based on the study of the traditional Canny algorithm, an improved Canny operator edge detection algorithm is proposed which shows the ability to autonomously select the threshold. Experimental results show that the improved Canny algorithm can effectively retain the true edge information, make the edges more continuous, and effectively achieve the edge detection of surgical instruments compared with the traditional Canny algorithm and the multi-scale morphology algorithm. © 2020 IEEE.

关键词： Image enhancement

来源：评论

学校读者我要写书评

暂无评论

Research on Carbon Monoxide Content Prediction Based on Improved Particle Swarm Optimization SVM

Research on Carbon Monoxide Content Prediction Based on Impr...

引用

第33届中国控制与决策会议

作者： Jianyun Ni Mingyang Zhao Yong Wang Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems School of Electrical and Electronic Engineering Tianjin University of Technology

In the petroleum processing industry,the carbon monoxide(CO) content of the flue gas emitted by the heating furnace is predicted according to the various gases that will be generated in the on-site environment of the heating ***,a Particle Swarm Optimization Support Vector Machine(PSO-SVM) model is proposed for the prediction of carbon monoxide *** optimizing the parameters of SVM for particle swarm optimization,it is easy to fall into the problem of local optimization and premature *** improved particle swarm optimization(IPSO) algorithm is proposed:in the optimization process,adding a passive aggregation term to improve the speed formula of the PSO algorithm can make the particles reach the global optimal ***,the carbon monoxide content is predicted by the improved PSO optimization support vector *** experimental results show that the improved particle swarm algorithm is used to fully explore the potential of the SVM model,and compared with the experimental results of other prediction models,it is proved that the model has the advantages of high accuracy.

关键词： CO content PSO Passive aggregation term SVM

来源：评论

学校读者我要写书评

暂无评论

Approximation Secure control of Cyber-physical systems under False Data Injection Attacks

Approximation Secure Control of Cyber-physical Systems under...

引用

第32届中国过程控制会议(CPCC2021)

作者： Xuxi Yang Qiang Gao Yuehui Ji Enzeng Dong School of Electrical and Electronic Engineering and Tianjin Key Laboratory for Control Theory & Applications in Complicated SystemsTianjin University of Technology

For the strict-feedback cyber-physical systems(CPSs),an approximation secure control is formulated based on backstepping,sliding mode disturbance observer and fuzzy logic system,to resist the stealthy false data injection attacks through sensor *** system state cannot be measured exactly as the sensors are attacked by *** initial system dynamic subjected to false data injection attacks is modelled as uncertainty dynamics and unknown control *** first n-1 step in the recursive control,sliding mode disturbance observer are designed to estimate the lumped *** the last step,two fuzzy logic system are introduced to approximate the lumped uncertainty and unknown control *** closed-loop stability analysis is discussed and proved Lyapunov *** numerical simulation can validate the effectiveness of the proposed control scheme.

关键词： Secure control Cyber-physical systems False Data Injection Attacks Sliding Mode Disturbance Observer

来源：评论

学校读者我要写书评

暂无评论

Design of a portable toxic gas monitor

Design of a portable toxic gas monitor

引用

2020 IEEE International Conference on Advances in Electrical Engineering and Computer applications, AEECA 2020

作者： Cong, Yu Zhang, Baofeng Xing, Yunlong Zhu, Junchao Ministry of Education Engineering Research Center of Optoelectronic Devices and Communicatioon Technology Tianjin300384 China Tianjin Key Laboratory for Control Theory and Applications in Complicated System Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9781728165202

To solve the problem of real-time monitoring of the distribution of toxic gases in high-risk pollution areas and ensure the safety of field workers, a portable toxic gas monitoring system based on u/COS-II is designed by combining embedded system and Internet of things technology. The system can collect six kinds of toxic gases such as carbon monoxide and sulfur dioxide in the environment in real-time;display the gas concentration through the human-computer interface, set the gas alarm threshold;and use the wireless transmission unit to upload the data to the cloud server. The experimental data show that the system has stable performance and small error, which can meet the requirements of real-time, accurate and comprehensive monitoring of gas distribution in high-risk pollution sites, and remind the site staff to evacuate in time. © 2020 IEEE.

关键词： Internet of things

来源：评论

学校读者我要写书评

暂无评论

Aero-optical imaging deviation-based study of exposure times for a typical blunt-ended air vehicle

引用

Applied Optics 2025年第16期64卷 D25-D34页

作者： Xuelong LiLiang Xu Qilong Wang Xiangjun Zhang Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems School of Electrical Engineering and AutomationTianjin University of Technology Tianjin 300384 China

In this paper, based on aero-optical imaging deviation, the exposure time required for the transition from transient to steady state under different boundary conditions is investigated for a typical blunt-ended air vehicle, and two methods of determining the flight state of a typical blunt-ended air vehicle are proposed. It is shown that the lower air density at higher altitudes leads to a decrease in the heat transfer efficiency and prolongs the time required to reach thermal equilibrium. The increase in Mach number accelerates the heating of the optical dome but delays the process of the system reaching steady state. Therefore, when optimizing the design to mitigate aero-optical effects, it is more critical to control the maximum temperature of the air vehicle at steady state than simply pursuing a high Mach. This study provides an important theoretical basis for the design of hypersonic air vehicles.

关键词： Imaging systems Infrared detectors Infrared imaging Optical systems Refractive index Wavefront distortions

来源：评论

学校读者我要写书评

暂无评论

control Strategy of Grid-connected Wind Power Inverter Based on Linear Active Disturbance Rejection control 17

Control Strategy of Grid-connected Wind Power Inverter Based...

引用

17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： Chen, Yulong Zhou, Xuesong Ma, Youjie Tianjin University of Technology Key Research Laboratory for Control Theory Applications in Complicated Systems 391 Binshui Xidao Xiqing District Tianjin300384 China

ISBN: (纸本)9781728164151

Aiming at the problem of insufficient anti-disturbance performance and control accuracy of the traditional double closed-loop control strategy in the grid-connected inverter of permanent magnet direct drive wind power system, this paper proposes a control strategy that applies linear active disturbance rejection control technology to the voltage outer loop controller. To improve the control performance of the DC bus voltage. By introducing the sum disturbance signal in the expanded state observer (ESO) to observe its change trend, an effective early correction signal is generated, thereby improving the control system dynamic disturbance observation ability. The analysis of frequency response characteristics and simulation results under various working conditions show that, compared with traditional control methods, this method not only has a faster response speed, but also has a better anti-interference ability. © 2020 IEEE.

关键词： Wind power

来源：评论

学校读者我要写书评

暂无评论

Electric Vehicle Charging Data Management system Based on RFID and Socket Communication

Electric Vehicle Charging Data Management System Based on RF...

引用

第33届中国控制与决策会议

作者： Ang Li School of Electrical and Electronic Engineering Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin University of Technology

Aiming at the problem of accurate calculation of large capacity random load in power grid due to the increase of electric vehicles,a remote management system for charging data of electric vehicles is ***,RFID technology is used to identify the information of charging vehicles,so as to obtain the charging capacity information of charging ***,based on socket communication technology and TCP/IP communication protocol,the identified information data is transferred to SQL Server 2008 r2 database through data analysis,and C#language form program is used to develop the interface of server and *** system realizes the data monitoring and collection of charging power of each charging station,and verifies the effectiveness and feasibility of RFID technology and socket communication technology in the accurate statistical application of the random loads such as electric vehicles.

关键词： RFID Socket Communication Electric Vehicle Data Management system

来源：评论

学校读者我要写书评

暂无评论

An alternative method for conducted immunity tests using multiple CDNs

引用

IEEE Electromagnetic Compatibility Magazine 2019年第1期8卷 54-58页

作者： Mingxing, Du Xing, Zhang Kexin, Wei Gerard, Hurley William Tianjin Key Laboratory of Control Theory and Applications in Complicated Systems Tianjin University of Technology Tianjin China

Measuring immunity is very important when it comes to studying the electromagnetic compatibility (EMC) of a device. At present, most of the standards relating to conducted immunity tests are designed for laboratory use, and the conducted immunity tests are often performed by using coupling/decoupling networks (CDN), in accordance with the international standard EN61000-4-6. However, the laboratory equipment has some limitations. If the (EUT) requires high currents, it is not possible to use one CDN on the mains side because a single CDN cannot handle the high currents involved. To overcome this problem, an alternative method is proposed for conducted immunity tests using multiple CDNs by splitting the mains current sufficiently to meet the current specifications of each individual CDN. From these tests, correction factors (CF) are extracted based on the analysis of loop impedances and injected loop currents in the standard laboratory test setups and in the alternative multi-CDN test setups. Finally, a link is established between the reference method and the multi-CDN method, and then, the equalization between them is realized with these correction factors. © 2012 IEEE.

关键词： Electromagnetic compatibility

来源：评论

学校读者我要写书评

暂无评论

Adaptive Resilient control for Cyber-Physical systems Against Unknown Injection Attacks in Sensor Networks

Research Square

引用

Research Square 2021年

作者： Ji, Yuehui Gao, Qiang Liu, Junjie School of Electrical and Electronic Engineering Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Tianjin300384 China

An adaptive resilient control is concerned for a class of cyber-physical systems(CPSs) in presence of stealthy false data injection attacks in sensor networks and unknown strict-feedback nonlinear dynamics. As the sensors are attacked by ill-disposed hackers, the exactly measured state information is unavailable for state feedback control. After theory ratiocinations, the initial issue of false data injection attacks is transformed into nonlinear uncertainty dynamics and unknown control directions at the last step. At each step in the recursive backstepping control, extended state observers(ESOs) in active disturbance rejection control(ADRC) are investigated to approximate the lumped system uncertainties. Specially, the Nussbaum functions are introduced at the last step in the adaptive control. All the closed-loop signals are proved to be semi-globally uniformly ultimately bounded by Lyapunov theory. Finally, numerical simulations verify that the proposed control can afford favorable stabilization performance and counter false data injection attack. © 2021, CC BY.

关键词： Cyber Physical system

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：