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China Communications 2023年第4期20卷 340-355页

作者： Yueping Cai Xiaowen Zhang Shaoliu Hu Xiaocong Wei School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400030China Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education Chongqing UniversityChongqing 400030China

The ubiquitous and deterministic communication systems are becoming indispensable for future vertical applications such as industrial automation systems and smart grids.5G-TSN(Time-Sensitive Networking)integrated networks with the 5G system(5GS)as a TSN bridge are promising to provide the required communication service.To guarantee the endto-end(E2E)QoS(Quality of service)performance of traffic is a great challenge in 5G-TSN integrated networks.A dynamic QoS mapping method is proposed in this paper.It is based on the improved K-means clustering algorithm and the rough set theory(IKCRQM).The IKC-RQM designs a dynamic and loadaware QoS mapping algorithm to improve its flexibility.An adaptive semi-persistent scheduling(ASPS)mechanism is proposed to solve the challenging deterministic scheduling in 5GS.It includes two parts:one part is the persistent resource allocation for timesensitive flows,and the other part is the dynamic resource allocation based on the max-min fair share algorithm.Simulation results show that the proposed IKC-RQM algorithm achieves flexible and appropriate QoS mapping,and the ASPS performs corresponding resource allocations to guarantee the deterministic transmissions of time-sensitive flows in 5G-TSN integrated networks.

关键词： 5G-TSN integrated networks QoS mapping traffic scheduling resource allocation

Distributed Secondary Control and Optimal Power Sharing in Microgrids

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IEEE/CAA Journal of Automatica Sinica 2015年第3期2卷 304-312页

作者： Gang Chen Ening Feng the Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education and the College of Automation Chongqing University

We address the control problem of microgrids and present a fully distributed control system which consists of primary controller,secondary controller,and optimal active power sharing controller.Different from the existing control structure in microgrids,all these controllers are implemented as local controllers at each distributed generator.Thus,the requirement for a central controller is obviated.The performance analysis of the proposed control systems is provided,and the finite-time convergence properties for distributed secondary frequency and voltage controllers are achieved.Moreover,the distributed control system possesses the optimal active power sharing property.In the end,a microgrid test system is investigated to validate the effectiveness of the proposed control strategies.

关键词： Microgrid droop control distributed control optimal control

Impulsive stabilization of a class of nonlinear system with bounded gain error

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Chinese Physics B 2014年第12期23卷 103-108页

作者：马铁东赵飞亚 Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education Chongqing University College of Automation Chongqing University

Considering mechanical limitation or device restriction in practical application, this paper investigates impulsive stabilization of nonlinear systems with impulsive gain error. Compared with the existing impulsive analytical approaches,the proposed impulsive control method is more practically applicable, which includes control gain error with an acceptable boundary. A sufficient criterion for global exponential stability of an impulsive control system is derived, which relaxes the condition for precise impulsive gain efficiently. The effectiveness of the proposed method is confirmed by theoretical analysis and numerical simulation based on Chua＇s circuit.

关键词： bounded gain error impulsive control exponential stability Chua＇s circuit

Feedback control scheme of traffic jams based on the coupled map car-following model

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Chinese Physics B 2013年第9期22卷 203-208页

作者：周桐孙棣华赵敏李华民 Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education Chongqing University College of Automation Chongqing University

Based on the pioneering work of Konishi et al. [Phys. Rev. E （1999） 60 4000], a new feedback control scheme is presented to suppress traffic jams based on the coupled map car-following model under the open boundary condition. The effect of the safe headway on the traffic system is considered. According to the control theory, the condition under which traffic jams can be suppressed is analyzed. The results are compared with the previous results concerning congestion control. The simulations show that the suppression performance of our scheme on traffic jams is better than those of the previous schemes, although all the schemes can suppress traffic jams. The simulation results are consistent with theoretical analyses.

关键词： traffic jam coupled map car-following model control scheme safe headway

A joint image encryption and watermarking algorithm based on compressive sensing and chaotic map

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Chinese Physics B 2015年第6期24卷 198-206页

作者：肖迪蔡洪坤郑洪英 key laboratory of dependable service computing in cyber physical society(Chongqing University) of Chinese ministry of education College of Computer ScienceChongqing University

In this paper, a compressive sensing （CS） and chaotic map-based joint image encryption and watermarking algorithm is proposed. The transform domain coefficients of the original image are scrambled by Arnold map firstly. Then the watermark is adhered to the scrambled data. By compressive sensing, a set of watermarked measurements is obtained as the watermarked cipher image. In this algorithm, watermark embedding and data compression can be performed without knowing the original image; similarly, watermark extraction will not interfere with decryption. Due to the characteristics of CS, this algorithm features compressible cipher image size, flexible watermark capacity, and lossless watermark extraction from the compressed cipher image as well as robustness against packet loss. Simulation results and analyses show that the algorithm achieves good performance in the sense of security, watermark capacity, extraction accuracy, reconstruction, robustness, etc.

关键词： joint encryption and watermarking compressive sensing chaos Arnold map

Load-redistribution strategy based on time-varying load against cascading failure of complex network

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Chinese Physics B 2015年第7期24卷 371-377页

作者：刘军熊庆宇石欣王楷石为人 School of Automation Chongqing University key laboratory of dependable service computing in cyber physical society Ministry of Education School of Software Engineering Chongqing University

Cascading failure can cause great damage to complex networks, so it is of great significance to improve the network robustness against cascading failure. Many previous existing works on load-redistribution strategies require global information, which is not suitable for large scale networks, and some strategies based on local information assume that the load of a node is always its initial load before the network is attacked, and the load of the failure node is redistributed to its neighbors according to their initial load or initial residual capacity. This paper proposes a new load-redistribution strategy based on local information considering an ever-changing load. It redistributes the loads of the failure node to its nearest neighbors according to their current residual capacity, which makes full use of the residual capacity of the network. Experiments are conducted on two typical networks and two real networks, and the experimental results show that the new load-redistribution strategy can reduce the size of cascading failure efficiently.

关键词： load redistribution,time-varying load,cascading failure,complex networks

RGCNU: Recurrent Graph Convolutional Network With Uncertainty Estimation for Remaining Useful Life Prediction

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IEEE/CAA Journal of Automatica Sinica 2023年第7期10卷 1640-1642页

作者： Qiwu Zhu Qingyu Xiong Zhengyi Yang Yang Yu School of Big Data&Software Engineering Chongqing UniversityChongqing 400044 key laboratory of dependable service computing in cyber physical society Ministry of EducationChongqing 400044China School of Biology and Engineering Guizhou Medical UniversityGuiyang 550025China

Dear Editor,This letter focuses on the problem of remaining useful life(RUL)prediction of equipment. Existing graph neural network(GCN)-based approaches merely provide the point estimation of RUL. However,the estimated RUL often varies widely due to the model parameters and the noise in data. It is important to know the uncertainty in predictions for reliable risk analysis and maintenance decision making.To map the relationship between noisy condition monitoring data and RUL with uncertainty.

关键词： letter estimation prediction

A new coupled map car-following model considering drivers' steady desired speed

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Chinese Physics B 2014年第5期23卷 41-45页

作者：周桐孙棣华李华民刘卫宁 College of Automation Chongqing University Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education Chongqing University College of Computer Science Chongqing University

Based on the pioneering work of Konishi et al., in consideration of the influence of drivers＇ steady desired speed ef/ect on the traffic flow, we develop a new coupled map car-following model in the real world. By use of the control theory, the stability condition of our model is derived. The validity of the present theoretical scheme is verified via numerical simulation, confirming the correctness of our theoretical analysis.

关键词： traffic flow traffic congestion coupled map car-following model steady desired speed effect

Density waves in a lattice hydrodynamic traffic flow model with the anticipation effect

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Chinese Physics B 2012年第4期21卷 619-624页

作者：赵敏孙棣华田川 College of Automation Chongqing UniversityChongqing 400030China key laboratory of dependable service computing in cyber physical society(Chongqing University) Ministry of EducationChongqing 400030China

By introducing the traffic anticipation effect in the real world into the original lattice hydrodynamic model, we present a new anticipation effect lattice hydrodynamic （AELH） model, and obtain the linear stability condition of the model by applying the linear stability theory. Through nonlinear analysis, we derive the Burgers equation and Korteweg-de Vries （KdV） equation, to describe the propagating behaviour of traffic density waves in the stable and the metastable regions, respectively. The good agreement between simulation results and analytical results shows that the stability of traffic flow can be enhanced when the anticipation effect is considered.

关键词： traffic flow lattice hydrodynamic model density waves anticipation effect