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Event-triggered Guaranteed Cost Control for Uncertain Switched Linear Systems

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Event-triggered Guaranteed Cost Control for Uncertain Switch...

第36届中国控制会议

作者： yiwen qi Yanhui Liu Pengyu Zeng School of Automation Shenyang Aerospace University

ISBN: (纸本)9781538629185

This paper studies the guaranteed cost state-feedback control for uncertain switched linear systems with an eventtriggering strategy. With the proposed event-triggering strategy, the system state can be sampled and updated only when a defined error exceeds a given threshold, which is very different from the traditional periodic sampling. More specifically, first,sufficient conditions for the stability and guaranteed cost performance of the resulting event-triggered switched closed-loop system are derived by utilizing the average dwell time method and linear matrix inequalities（LMIs） technique. A certain upper bound of the guaranteed cost against the system uncertainties is obtained. Subsequently, another set of sufficient conditions are presented for solving the event-triggered guaranteed cost state-feedback controllers. Furthermore, the Zeno behavior is discussed by presenting a positive lower bound estimation on the inter-execution intervals. Finally, numerical simulations are provided to demonstrate the effectiveness of the proposed approach.

关键词： Uncertain switched linear systems event-triggering strategy guaranteed cost state-feedback average dwell time

Condition Monitoring of the Aircraft Airborne Equipment Based on Neural Network and Information Fusion

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Condition Monitoring of the Aircraft Airborne Equipment Base...

第25届中国控制与决策会议

作者： Jianguo Cui Xue Yan Liying Jiang yiwen qi Yunzhe An Dong Zhang School of Automation Shenyang Aerospace University School of Computer Shenyang Aerospace University Shenyang Aeroengine Research Institute

ISBN: (纸本)9781467355339

According to the poor effect of current aircraft airborne equipment, a method based on the Neural Network and Dempster-Shafer evidence theory information fusion is put forward. As the important aircraft airborne equipment, the aero-engine, whose lubrication system works properly or not, directly affect the operation of the aero-engine condition. This paper will study on the condition monitoring of lubrication system of aero-engine. Firstly, through the aero-engine lubrication condition monitoring professional system, the performance status information will be got. Then given to the large amount of information we acquired, two neural networks are used to diagnose respectively. In order to improve the accuracy of the health condition monitoring ,on this basis, Dempster-Shafer evidence theory is used to conduct a information fusion of the results to the above two neural networks. The advantages of the method of artificial neural network and D-S evidence theory are effectively improved the diagnostic accuracy. So this paper gives a good health diagnosis method, and it has a good value of engineering application.

关键词： Aircraft Airborne Equipment Aero-engine Lubrication System Information Fusion Condition Monitoring

Multi-party privacy-preserving decision tree training with a privileged party

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Science China(Information Sciences) 2024年第8期67卷 253-268页

作者： yiwen TONG qi FENG Min LUO Debiao HE Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education School of Cyber Science and Engineering Wuhan University Shanghai Technology Innovation Centre of Distributed Privacy-Preserving Artificial Intelligence Matrix Elements Technologies Key Laboratory of Computing Power Network and Information Security Ministry of EducationShandong Computer Science Center Qilu University of Technology(Shandong Academy of Sciences)

Currently, a decision tree is the most commonly used data mining algorithm for classification tasks. While a significant number of studies have investigated privacy-preserving decision trees, the methods proposed in these studies often have shortcomings in terms of data privacy breach or efficiency. Additionally,these methods typically only apply to symmetric frameworks, which consist of two or more parties with equal privilege, and are not suitable for asymmetric scenarios where parties have unequal privilege. In this paper,we propose SecureCART, a three-party privacy-preserving decision tree training scheme with a privileged party. We adopt the existing pMPL framework and design novel secure interactive protocols for division,comparison, and asymmetric multiplication. Compared to similar schemes, our division protocol is 93.5–560.4× faster, with the communication overhead reduced by over 90%; further, our multiplication protocol is approximately 1.5× faster, with the communication overhead reduced by around 20%. Our comparison protocol based on function secret sharing maintains good performance when adapted to pMPL. Based on the proposed secure protocols, we implement SecureCART in C++ and analyze its performance using three real-world datasets in both LAN and WAN environments. he experimental results indicate that SecureCART is significantly faster than similar schemes proposed in past studies, and that the loss of accuracy while using SecureCART remains within an acceptable range.

关键词： privacy protection decision trees secure multi-party computation secret sharing privileged party

Health Assessment Method of the Aircraft Hydraulic System Based on Gray Clustering 25th

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Health Assessment Method of the Aircraft Hydraulic System Ba...

第25届中国控制与决策会议

作者： Jianguo Cui Zeli Lin Liying Jiang yiwen qi Fengxia Ma Xin Jin School of Automation Shenyang Aerospace University College of Northern Science and Technology Shenyang Aerospace University Shenyang Aeroengine Research Institute

ISBN: (纸本)9781467355339

In connection with the problem which is difficult to be accurately assess the present health status of the aircraft hydraulic system, in this paper, a gray cluster analysis method has been put forward and used to comprehensively assess the health status of the aircraft hydraulic system. Firstly, according to the expertise to rate for the key components of the aircraft hydraulic system. Then it uses and relies on piecewise linear function to determine the whitening weight function. At last it uses the gray clustering algorithm to accurately assess the health status of the aircraft hydraulic system （divided into five levels: health, sub-health, available, fault, scrap）. And it uses a case to verify the accuracy of the assessment methods. And it has a good application value for the maintenance and security of the aircraft hydraulic system.

关键词： PHM Aircraft Hydraukics Health State Evaluation Grey Clustering

Rapid Phase Ambiguity Elimination Methods for DOA Estimator via Hybrid Massive MIMO Receive Array

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Chinese Journal of Electronics 2024年第1期33卷 175-184页

作者： Xichao ZHAN Zhongwen SUN Feng SHU yiwen CHEN Xin CHENG Yuanyuan WU qi ZHANG Yifan LI Peng ZHANG School of Information and Communication Engineering Hainan University School of Electronic and Optical Engineering Nanjing University of Science and Technology

For a sub-connected hybrid multiple-input multiple-output(MIMO) receiver with K subarrays and N antennas, there exists a challenging problem of how to rapidly remove phase ambiguity in only single time-slot. A direction of arrival(DOA) estimator of maximizing received power(Max-RP) is proposed to find the maximum value of K-subarray output powers, where each subarray is in charge of one sector, and the center angle of the sector corresponding to the maximum output is the estimated true DOA. To make an enhancement on precision, Max-RP plus quadratic interpolation(Max-RP-qi) method is designed. In the proposed Max-RP-qi, a quadratic interpolation scheme is adopted to interpolate the three DOA values corresponding to the largest three receive powers of *** achieve the Cramer Rao lower bound, a Root-MUSIC plus Max-RP-qi scheme is developed. Simulation results show that the proposed three methods eliminate the phase ambiguity during one time-slot and also show low computational complexities. The proposed Root-MUSIC plus Max-RP-qi scheme can reach the Cramer Rao lower bound,and the proposed Max-RP and Max-RP-qi are still some performance losses 2–4 d B compared to the Cramer Rao lower bound.

关键词： Phased arrays Interpolation Wireless sensor networks Direction-of-arrival estimation Simulation Receiving antennas Massive MIMO

Decentralized Event-Triggered Control for Switched Systems Under Stochastic Cyber Attacks and Actuator Failures

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Decentralized Event-Triggered Control for Switched Systems U...

第三十九届中国控制会议

作者： Xiujuan Zhao yiwen qi Shuo Yuan Xindi Xu yiwen Tang School of Automation Shenyang Aerospace University

This paper studies the decentralized event-triggered H∞ control for networked switched systems subject to stochastic cyber attacks and actuator failures. First, since the system state is divided into multiple communication channels, decentralized states are sampled and triggered, respectively. A set of decentralized event-triggering mechanisms（DETMs） is introduced to determine whether the sampled data is released. Subsequently, a data buffer merges the released data from decentralized triggering mechanisms. Stochastic cyber attacks and actuator failures are taken into account for a more practical situation. By using a delay system analysis approach, a time-delay closed-loop switched system is derived. Then, sufficient conditions are provided to guarantee H∞ performance of switched system by utilizing piecewise Lyapunov functional method and average dwell time technique. Moreover, sufficient conditions for designing event-triggered state feedback controllers and event-triggering parameters are given. Finally, a numerical simulation is shown to verify the effectiveness of the proposed method.

关键词： Switched systems Decentralized event-triggering mechanisms Stochastic cyber attacks Actuator failures

Resilient Event-triggered Control for Switched Linear Systems With Network Attacks

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Resilient Event-triggered Control for Switched Linear System...

第32届中国控制与决策会议

作者： Wei Guan Ning Xing yiwen qi Shuo Yuan Xindi Xu Ziyang Liu yiwen Tang School of Automation Shenyang Aerospace University

This paper studies resilient event-triggered H control for switched linear systems under periodic denial of service(DoS) attacks. The resilient event-triggering strategy is used to suppress the influence of DoS attacks and increase the utilization of system resources. Instead of using piecewise functions, a united expression is developed to incorporate different system structures inducing by DoS attacks into one form. Then, by the piecewise Lyapunov functional and average dwell time method, sufficient conditions are derived for guaranteeing the global exponential stability with an H performance level of the resilient event-triggered switched closed-loop system. Subsequently, a sufficient criterion is given for designing the resilient event-triggering parameters and H state feedback controllers in terms of linear matrix inequalities(LMIs). At last, a numerical simulation is provided to demonstrate the feasibility of proposed results.

关键词： Network attacks Resilient event-triggering strategy H∞ performance Average dwell time

Design of an Automatic Testing System for Camera UI Test

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Design of an Automatic Testing System for Camera UI Test

第三十九届中国控制会议

作者： Pengfei Ji yiwen qi Chi Zhang Ning Xing School of Automation Shenyang Aerospace University

In view of the current tedious camera inspection process,limited test cycle and complex test content,in order to reduce the work intensity of testers,the automatic test is designed for functional test with high repeatability and easy *** paper uses video image processing technology and proposes an automatic test application for camera User Interface（UI）.The experimental results show that this system can meet the test requirements for UI in camera function test,which can effectively save the time cost of UI test and improve test efficiency.

关键词： Camera Detection Technology Automatic Test Hash Algorithm Video Image Processing

Brain regulates weight bearing bone through PGE2 skeletal interoception: implication of ankle osteoarthritis and pain

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Bone Research 2024年第1期12卷 107-121页

作者： Feng Gao qimiao Hu Wenwei Chen Jilong Li Cheng qi yiwen Yan Cheng qian Mei Wan James Ficke Junying Zheng Xu Cao Department of Orthopedic Surgery Johns Hopkins University School of MedicineBaltimoreMaryland 21205USA Department of Biomedical Engineering Johns Hopkins University School of MedicineBaltimoreMaryland 21205USA

Bone is a mechanosensitive tissue and undergoes constant remodeling to adapt to the mechanical loading ***,it is unclear whether the signals of bone cells in response to mechanical stress are processed and interpreted in the *** this study,we found that the hypothalamus of the brain regulates bone remodeling and structure by perceiving bone prostaglandin E2(PGE2)concentration in response to mechanical *** PGE2 levels are in proportion to their weight *** weight bearing changes in the tail-suspension mice,the PGE2 concentrations in bones change in line with their weight bearing *** of cyclooxygenase-2(COX2)in the osteoblast lineage cells or knockout of receptor 4(EP4)in sensory nerve blunts bone formation in response to mechanical ***,knockout of TrkA in sensory nerve also significantly reduces mechanical load-induced bone ***,mechanical loading induces cAMP-response element binding protein(CREB)phosphorylation in the hypothalamic arcuate nucleus(ARC)to inhibit sympathetic tyrosine hydroxylase(TH)expression in the paraventricular nucleus(PVN)for ***,we show that elevated PGE2 is associated with ankle osteoarthritis(AOA)and ***,our data demonstrate that in response to mechanical loading,skeletal interoception occurs in the form of hypothalamic processing of PGE2-driven peripheral signaling to maintain physiologic bone homeostasis,while chronically elevated PGE2 can be sensed as pain during AOA and implication of potential treatment.

关键词： pain elevated PGE2

维普期刊数据库