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第37届中国控制会议

作者： Bo Liang Shan Jiang Liya Dou Lin Wang Xiaofan Wang Department of automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China

With the development of the Internet, many online websites spring up, which provide a platform for users to purchase products. In order to evaluate the real quality of products, many of these websites introduce the rating system, where people can give discrete ratings to products to express whether they are satisfied or not about the transactions. Nevertheless, various forms of unfair attacks have been observed in the rating system. Therefore, how to evaluate the intrinsic quality of products becomes a significant yet difficult problem. There have been several works focusing on building a reputation system to solve this problem.In this paper, we consider that a user with a small rating fluctuation deserves more reputation. Based on this idea, we propose an efficient method to calculate the product quality in an iterative way. We use the standard deviation of the vector difference between the user’s rating vector and the product’s estimated quality vector to measure the fluctuation. The user reputation is inversely proportional to the product of the mean square between his rating vector and the products’ estimated quality vector times the standard deviation. And then we redistribute the user’s reputation according to the user’s degree. The product quality is determined by the weighted average ratings. Our simulations demonstrate that our method can recognize the good quality product and give them high rankings. The proposed method has a better performance and robustness than the state of the art methods in both real and artificial networks.

关键词： Rating system User reputation Iterative ranking method

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SDRE based Optimal Time-Varying Sliding Mode Control for Re-entry Vehicle

SDRE based Optimal Time-Varying Sliding Mode Control for Re-...

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第25届中国控制与决策会议

作者： Liang Wang Yongzhi Sheng Xiangdong Liu Jie Geng School of automation Beijing Institute of Technology key laboratory for Intelligent Control & Decision of Complex Systems Beijing Institute of Technology

ISBN: (纸本)9781467355339

An optimal time-varying sliding mode controller based on SDRE approach is proposed in this paper for re-entry vehicle attitude control in the presence of parametric uncertainties and external disturbances. Firstly, an optimal time-varying sliding surface is obtained through the minimization of a given performance index function and the philosophy of time-varying sliding mode control. Subsequently, a discontinuous control law is designed for guaranteeing the existence of the sliding mode throughout the entire response of the system. Therefore, the global robustness can be ensured. Simulation example is finally given to illustrate the effectiveness of the proposed controller.

关键词： Re-entry vehicle Attitude control SDRE Optimal time-varying sliding mode control

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Long-term stable target tracking algorithm based on improved Staple

Long-term stable target tracking algorithm based on improved...

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第40届中国控制会议

作者： Haoyu Liao Le Li Yongqiang Bai School of automation Beijing Institute of Technology key laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology

Staple algorithm has been widely proven to be an efficient target tracking method, but it is still easy to fail in some tracking scenarios such as target deformation, motion blur, and complete occlusion. This paper makes improvements to the above problems. First of all, we use a binary mask based on spatial reliability to enhance the target information in Staple’s color features, which improves the tracking accuracy of the algorithm in complex scenes. Secondly, we propose a response graph evaluation index based on secondary detection, that is, the least square filter is used for convolution at the original response peak to obtain a more accurate tracking state judgment. Finally, if the current state is judged to be a failure, we use a particle filter-based motion estimation method to relocate the target, thereby improving the algorithm’s tracking success rate when the target is occluded. The test results on the OTB2015 data set show that the overall accuracy of the algorithm in this paper has reached 80%, and the overall success rate has reached 73.2%, which proves the long-term stable tracking performance of the algorithm.

关键词： Target tracking Staple Binary mask Particle filter Anti-occlusion

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Optimal Control for Realizing Target Flow Velocity in 1D MHD Flow

Optimal Control for Realizing Target Flow Velocity in 1D MHD...

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第36届中国控制会议

作者： Zhigang Ren Xiangguo Liu Chao Xu Tehuan Chen Zongze Wu School of automation Guangdong University of Technology state key laboratory of Industrial Control Technology and Institute of Cyber-Systems & Control Zhejiang University Faculty of Mechanical Engineering and Mechanics Ningbo University

ISBN: (纸本)9781538629185

In this paper, we consider an optimal control problem arising in a one-dimensional（1D） Magnetohydrodynam（MHD） flow, which can be modelled by a coupled partial differential equations（PDEs） where the external control input（externinduction of magnetic field） takes the multiplicative effect exerted on both state variables(momentum and magnetic componentsThe aim is to derive the flow velocity to within close proximity of a desired target flow velocity at the pre-indicated termintime. We first use the Galerkin method to obtain a low dimensional dynamical ordinary differential equation（ODE） model baseon the original coupled PDEs. Then, we combine the control parameterization method with the time-scaling transformatiotechnique to obtain an approximate optimal parameter selection problem, which can be solved using gradient-based optimizatiotechniques such as sequential quadratic programming（SQP）. The exact gradients of the cost functional with respect to thdecision parameters are computed based on the analytical equations. Finally, we conclude the paper with simulation results fan example of the 1D MHD flow.

关键词： Magnetohydrodynamic Flow Control Galerkin Method Control Parameterization Time-scaling Transformation

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A Location Strategy for Traffic Emission Remote Sensing System Based on Bus Routes

A Location Strategy for Traffic Emission Remote Sensing Syst...

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第36届中国控制会议

作者： Yuxiao Yang Zerui Li Yu Kang Department of automation University of Science and Technology of China state key laboratory of Fire Science University of Science and Technology of China Institute of Advanced Technology University of Science and Technology of China key laboratory of Technology in Geo-Spatial Information Processing and Application System Chinese Academy of Sciences

ISBN: (纸本)9781538629185

This paper presents a novel location strategy for traffic emission remote sensing system（TERSS） based on bus routes.For the purpose of reducing cost,the corresponding Hypergraph Model is established based on graph theory and the topological structure of urban road network.Then,the location problem of traffic emission remote sensing detectors is defined and transformed into finding the minimum transversal of the Hypergraph which is used to obtain the location scheme for TERSS based on bus routes according to Boolean algebra theorems.Finally,the proposed location strategy helps to obtain a location scheme for a city bus system to monitor buses as many as possible.

关键词： Location strategy TERSS bus routes Boolean algebra

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Bandwidth-saving Panoramic Video Distribution System Based on Semantic Segmentation

Bandwidth-saving Panoramic Video Distribution System Based o...

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第32届中国过程控制会议(CPCC2021)

作者： Jiangeng Li Kai Xu Guangsheng Wang College of automation Faculty of Information TechnologyBeijing University of Technology Beijing key laboratory of Computational Intelligence and Intelligent System

The amount of panoramic video data is large,and transmission under limited bandwidth conditions will inevitably lead to different degrees of stalls and frame loss.In order to solve this problem,this research has improved the panoramic video transmission process,using the form of cutting the panoramic video and pushing the stream to reduce the amount of data transmission.It is divided into three parts:video acquisition side,server side and client side.The video acquisition side uses a panoramic camera to realize 360-degree video splicing and streaming operations.The server side pulls the video stream pushed by the video capture side,processes it and completes the block video push operation.The server side consists of a semantic segmentation module and a block video push module.The semantic segmentation module recognizes and divides the panoramic image into N blocks by introducing the DeepLabv3+ network combined with the context switch module,determines whether there are moving objects in each block,and prompts the information to the block video push module in the form of a matrix.The block video push module determines the index of the block that needs to be streamed according to the matrix and completes the streaming operation of the related block video.The client side pulls the block video stream pushed by the server side,and performs the mapping operation in the browser to complete the playback of the panoramic video on the browser.For the block video that the server side judges that no moving objects appear,the state of the previous frame is still retained.And for the block video with moving objects,the previous frame will be updated by video streaming and texture overlay operations,which greatly reduces the amount of data transmission during the interaction between the server and the client,thereby saving bandwidth.This system not only saves bandwidth,but also improves video utilization efficiency.Taking into account the possible insufficient bandwidth in remote areas,this research can meet people’s viewing ne

关键词： panoramic video semantic segmentation block video streaming operation

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A Sampled-Data Hamilton-Jacobi Reachability Approach to Safe and Robust Motion Planning

A Sampled-Data Hamilton-Jacobi Reachability Approach to Safe...

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第30届中国控制与决策会议

作者： Sébastien Kleff Ning Li Department of automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China

Reachability analysis provides safety guarantees for state-constrained control systems, which makes it an attractive tool to address motion planning problems, but there are still few applications in cluttered environments. In this paper, a Hamilton-Jacobi reachability based formulation of the motion planning problem in both static and dynamic environments for sampled-data systems is proposed. Also, a robust safety-preserving and target-reaching sampled-data feedback controller is synthesized. We use an existing sampled-data reachability algorithm to compute robust reachavoid tubes and formally extend it to the state-time space in order to deal with moving target and obstacles. The validity of this approach is eventually demonstrated through simulations in two simple scenarios and the results are discussed.

关键词： Motion Planning Obstacle Avoidance Reachability Analysis Hamilton-Jacobi Equations Sampled-Data Systems

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Event-Triggering Cooperative Output Regulation of Singular Linear Multi-Agent Systems with Zeno-Free Triggering

Event-Triggering Cooperative Output Regulation of Singular L...

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第32届中国控制与决策会议

作者： Wei Wang Huaguang Zhang Zhenwei Liu Juan Zhang School of Information Science and Engineering Northeastern University state key laboratory of Synthetical automation for Process Industries(Northeastern University) School of Information Science and Engineering Northeastern University(Northeastern University)

In this paper,cooperative output regulation problem of singular heterogeneous linear multi-agent systems with directed communication topology is studied.We design a triggering strategy that combines time-triggering and event-triggering so that Zeno behavior can be avoided completely.Compared with the existing literatures,the main characteristic of this paper is to apply the method of time-and event-triggering to singular multi-agent systems.The results show that the proposed triggering mechanism combined with the proposed distributed control law can solve the problem of cooperative output regulation.Finally,numerical simulation is given to show the effectiveness of the controller and the triggering mechanism.

关键词： Cooperative output regulation Event-triggered control Linear multi-agent systems Singular systems

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Subspace Identification of Closed-loop Errors-in-variables Systems

Subspace Identification of Closed-loop Errors-in-variables S...

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第32届中国控制与决策会议

作者： Li-Hui Geng Terefe Bayisa Ayele Jin-Cang Liu Tianjin key laboratory of Information Sensing and Intelligent Control School of Automation and Electrical EngineeringTianjin University of Technology and Education

This paper studies an identification method for errors-in-variables（EIV） systems governed by an observer based state feedback control law.Due to the input and output measurement noises,traditional identification methods are typically inapplicable in most cases.In order to estimate such a closed-loop EIV system,a coprime factor（CF） model for the true plant is first identified from the available reference,input and output measurements by using the subspace identification method and then a plant estimation model is able to be extracted from the identified CF model.Finally,a numerical simulation is given to show the effectiveness of the studied identification method.

关键词： Subspace identification Closed-loop Errors-in-variables system Coprime factor

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Design and Analysis of a Horizontal Quasi-Zero Stiffness Vibration Isolator by Combining rolling-Ball and Disk Springs in Parallel

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Journal of Beijing Institute of Technology 2017年第4期26卷 468-476页

作者： Gaofeng Guan Dengfeng Xu Yu Zhu Qiang Li Qiang Yu School of Mechatronics Engineering University of Electronic Science and Technology of China Chengdu 611731 China state key Lab of Tribology Tsinghua University Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Beijing key Lab of Precision/Ultra-precision Manufacturing Equipment and Control Tsinghua University Beijing 100084 China School of Information Engineering Wuchang University of Technology Wuhan 430223 China

Combining disk springs having negative stiffness with a rolling-ball in parallel is proposed in this paper. It is used to reduce the system stiffness and the positioning error in a non-ideal environment.The characteristics of a disk spring are analyzed. The dynamic equation of its motion has been obtained based on Newton＇s second law. After definition of a error margin,the dynamic equation of the motion can be treated as a Duffing oscillator,and the influences of non-dimensional parameters on the stiffness and transmissibility are studied. The natural frequency and transmissibility are achieved in a linearization range,where the ratio of linear to nonlinear items is small enough.The influence of mass ratio and non-dimensional parameters on natural frequency are analyzed. Finally,a comparison of numerical example demonstrates that the QZS system can realize a lower stiffness within an increased range.

关键词： quasi-zero stiffness （QZS） vibration isolation natural frequency transmissibility

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