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International Journal of control and Automation 2016年第10期9卷 293-302页

作者： He, Zhaolan Wang, Jing Liu, Zongze Zhao, Jie School of Automation Harbin University of Science and Technology Harbin China Institute of Control and Communication Engineering Harbin University of Science and Technology Harbin China

In this paper, a novel fault-tolerant control scheme is proposed for a class of uncertain switched systems with time-delay. The mathematical model of actuator which fault is established. Our attention is focused on the design of a sliding mode fault-tolerant controller, which guarantees the system to be asymptotically stable and has a H∞ disturbance attenuation performance in the case of actuator failure. Sufficient conditions for the existence of a desired sliding mode controller are established in terms of linear matrix inequalities (LMIs), and the corresponding sliding mode controller is designed. Simulation results verify the validity and feasibility of the proposed fault-tolerant control strategy. © 2016 SERSC.

关键词： Time delay

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The influence of PROFIBUS message block time on transmission delay time property

The influence of PROFIBUS message block time on transmission...

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6th International Forum on Strategic technology, IFOST 2011

作者： Zhang, Yuping Li, Chen Higher Educational Key Laboratory for Measuring and Control Technology College of Measure-Control Tech.and Communication Engineer Harbin University of Science and Technology Harbin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China

ISBN: (纸本)9781457703966

The real time property of fieldbus is very important to industrial control system. The transmission time delay is an important factor that influences the real time property of fieldbus. Starting from the medium access control mechanism of PROFIBUS, the PROFIBUS simplified transmission time delay formulas were given, and one of the important factors that influence message transmission time delay message block time, has been deeply analyzed. According to the relation of the address of the node which tries to send message with the node which owns the token, PROFIBUS message block time mathematical model was proposed, and the correctness of the mathematical model has been validated by the simulation. The conclusion of this paper will provide the theoretic reference basis for the further study on the real time property of PROFIBUS. © 2011 IEEE.

关键词： Medium access control

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State-of-the-Art Development of Complex Systems and Their Simulation Methods

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Complex System Modeling and Simulation 2021年第4期1卷 271-290页

作者： Yiming Tang Lin Li Xiaoping Liu School of Computer and Information and Engineering Research Center of Safety Critical Industry Measure and Control TechnologyMinistry of EducationHefei University of TechnologyHefei 230601China

The research on complex systems is different from that on general systems because the former must consider self-organization,emergence,uncertainty,predetermination,and *** an important method to transform the world,a simulation is one of the most important skills to discover complex *** this study,we provide a survey on complex systems and their simulation ***,the development history of complex system research is summarized from two main ***,the eight common characteristics of the most complex systems are ***,the simulation methods of complex systems are introduced in detail from four aspects,namely,meta-synthesis methods,complex networks,intelligent technologies,and other *** the overall point of view,intelligent technologies are the driving force,and complex networks are the advanced ***-synthesis methods are the integration strategy,and other methods are the *** addition,we show three complex system simulation examples:digital reactor simulation,simulation of a logistics system in the industrial site,and crowd evacuation *** examples show that a simulation is a useful means and an important method in complex system ***,the future development prospects for complex systems and their simulation methods are suggested.

关键词： systems science complex systems complexity complex system simulation

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Towards green for relay in InterPlaNetary Internet based on differential game model

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Science China(Information Sciences) 2014年第4期57卷 65-73页

作者： LIN FuHong LIU Qian ZHOU XianWei XIONG Ke School of Computer and Communication Engineering University of Science and Technology Beijing School of Computer and Information Technology Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University

InterPlaNetary Internet(IPN)plays a very important role in the exploitation of ***,the relays in IPN are suffered from high symbol error,limited storage space,and limited available *** analyze the performance of the relay in IPN,in this article,we build a differential game model,where the controller is transmitting rate,and the goal is to maximize the payoff according to the symbol error rate,the storage space and the available energy in the *** such a design,the green relays can be achieved for IPNs,which could prolong the live of the *** the model is not easy to discuss,we analyze it using the Bellman theorem and then get some formulas on the trace of the optimal transmitting ***,extensive simulation results are presented to demonstrate the performance of our proposed model,which shows that by using our derived optimal transmitting rate trace,the relay’s payoff can be maximized.

关键词： IPN differential game symbol error limited storage space energy efficiency

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Pilot decontamination in massive MIMO systems based on pilot design and allocation

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International Journal of Performability engineering 2019年第10期15卷 2753-2761页

作者： Dong, Jingwei Han, Zhiyu Han, Chuang School of Measure-Control Technology and Communication Engineering Harbin University of Science and Technology Harbin150080 China

Pilot contamination has become an important factor affecting the development of massive MIMO. To mitigate pilot contamination, a new scheme of joint polar coordinate pilot assignment and pseudo random code pilot design is proposed in this paper. The scheme allocates the pilot according to the size of the user's polar angle, which is marked with polar coordinates, and uses pseudo random codes with different time delays to add disturbance to users that share the same pilot sequence and users of neighboring cells so as to improve the accuracy of channel estimation. Through theoretical derivation and data simulation analysis of minimum mean square error (MMSE) channel estimation of the system, the scheme can significantly reduce the mean square error (MSE) of channel estimation and improve the signal-to-noise ratio and average transmission rate of uplink transmission. Thus, the adverse effect of pilot contamination on channel estimation is reduced, and the channel throughput is improved. © 2019 Totem Publisher, Inc. All rights reserved.

关键词： MIMO systems

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A new mechanism to provide QoS in IEEE 802.11 MAC

A new mechanism to provide QoS in IEEE 802.11 MAC

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2006 IEEE 64th Vehicular technology Conference, VTC-2006 Fall

作者： Kai, Kang Xiaokang, Lin Aili, Wang Graduate School at Shenzhen Tsinghua University Shenzhen China College of Measure-control Tech. and Communication Harbin University of Science and Technology Harbin China

ISBN: (纸本)1424400635

This paper proposes a new mechanism to support Medium Access control (MAC)-level Quality-of-Service (QoS) in IEEE 802.11. Several slots are assembled together to form a super slot, and every slot in the super slot is designated for a given priority traffic to send frames. The slot assignment is done according to the traffic priority. The highest priority traffic is sent at the first slot in a super slot and the lowest priority traffic is sent at the last one. By the arrangement on the sending order, if many stations with different priority traffic want to send frames in a super slot all together, only the highest priority traffic of them can get the transmission opportunity (TXOP). This new priority scheme is robust and provides good performance on throughput, MAC delay and frame dropping probability for the high priority traffic. This new mechanism can improve the performance of IEEE 802.11e EDCA greatly. © 2006 IEEE.

关键词： Medium access control

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Channel and space-based joint rate allocation algorithm

Channel and space-based joint rate allocation algorithm

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Dayong Wang Chao Yuan Yu Sun Xin Lu Hui Guo Frederic Dufaux Ce Zhu Key Laboratory of Big Data Intelligent Computing Chongqing University of Posts and Telecommunications Guangxi Key Laboratory of Machine Vision and Intelligent Control Wuzhou University Chongqing Key Laboratory of Image Cognition Chongqing University of Posts and Telecommunications China Department of Computer Science University of Central Arkansas Faculty of Computing Engineering and Media (CEM) De Montfort University UK Université Paris-Saclay CNRS CentraleSupélec Laboratoire Des Signaux et Systèmes France School of Information and Communication Engineering University of Electronic Science and Technology of China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Rate control is a critical component for image and video compression Particularly under limited network bandwidth conditions, bitrate control is essential to ensure efficient image transmission by effectively allocation channel resources. In this research, since both Channel and Spatial have relationship with rate allocation, we first propose a joint Channel-wise and Spatial-wise Quantization scheme to determine optimal quantization parameters. Subsequently, we develop a quantization step estimation network to obtain parameters to efficiently allocate rate according to target rate. Experiments demonstrate that our algorithm significantly improve compressed image quality with minimal bitrate distortion and achieve accurate rate control with nearly 3% average bitrate error.

关键词： Image quality Quantization (signal) Image coding Bit rate Signal processing algorithms Estimation Rate-distortion Video compression Resource management Speech processing

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Regional path moving horizon tracking controller design for autonomous ground vehicles

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Science China(Information Sciences) 2017年第1期60卷 201-207页

作者： Hongyan GUO Feng LIU Ru YU Zhenping SUN Hong CHEN State Key Laboratory of Automotive Simulation and Control Jilin University(Campus Nanling) College of Communication Engineering Jilin University (Campus Nanling) School of Mechatronic Engineering and Automation National University of Defense Technology

A novel regional path tracking description is presented in this manuscript, and the moving horizon control method that is model predictive control(MPC) is proposed to discuss the regional path tracking issue which could avoid colliding road boundary when tracking a more complex road effectively. The feasible region for autonomous ground vehicles(AGVs) running is determined first according to the detected road ***, in order to keep the actual trajectory of AGVs in the region and satisfy the safety requirements, MPC method is employed to design the path tracking controller considering actuator and road boundary *** order to verify the effectiveness of the proposed method, experiments based on Hongqi AGV HQ430 are carried out, and the results illustrate that the presented method could be successfully applied to Hongqi AGV vehicle HQ 430.

关键词： autonomous ground vehicles regional path tracking model predictive control road boundaries experimental validation

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Optimization Algorithm of RGB-D SLAM Visual Odometry based on Triangulation

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International Journal of Performability engineering 2020年第3期16卷 438-445页

作者： Dong, Jingwei Jiang, Yiming Han, Zhiyu School of Measure Control Technology and Communication Engineering Harbin University of Science and Technology Harbin150080 China

In this paper, an improved RGB-D SLAM scheme is proposed to solve the problems of great tracking error, long time-consuming in front-end, and high pressure of algorithm in back-end. The realization scheme is mainly aimed at improving the visual odometry. First, the ORB extraction algorithm is used to extract the feature points of the current frame and calculate the descriptors. Then, the current frame is matched with the local map by descriptors, and the matched feature points are added to the local map. Finally, the camera pose is calculated by the PnP algorithm. In order to ensure the tracking accuracy, a triangulation algorithm is proposed to optimize the depth value of map points in the local map. A series of fr1 datasets in the tum database are tested. The experimental results show that the real-time performance is guaranteed, and the RMSE (root mean square error) in the tracking process is reduced by 9% on average. Moreover, the image indexes of the point cloud image generated in the tracking process are also significantly improved. © 2020 Totem Publisher, Inc. All rights reserved.

关键词： Triangulation

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A new method for realizing LOG filter in image edge detection

A new method for realizing LOG filter in image edge detectio...

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6th International Forum on Strategic technology, IFOST 2011

作者： Xu, Jingbo Liu, Bo Lin, Haijun Li, Jianxin College of Measure-control Technology and Communication Engineering Harbin University of Science and Technology Harbin 150080 China Higher Educational Key Laboratory for Measuring and Control Technology Instrumentations of Heilongjiang Province Harbin 150080 China

ISBN: (纸本)9781457703966

LOG filter for image edge detection consists of Gaussian filter and Laplace operator. Based on the central limit theorem and the separating characteristic of two dimensional Gaussian filter, Gaussian approximation filter is constructed. The digital filtering algorithm for Gaussian approximation filter is concluded through the bilinear transformation method and zero phase shift filtering technology. The algorithm combined with the Laplace operator has been successfully applied in the implementation of LOG filtering for edge detection. Applying Gaussian approximation filter in LOG filtering is helpful for multi-scale LOG filtering because only one parameter in the algorithm needs to be changed. This method is more convenient than the template method in which the coefficients of the whole mask of LOG filter with different scale need to be refreshed. This is a new implementation for LOG filter. © 2011 IEEE.

关键词： Laplace transforms

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