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Asymptotic Behavior of Asynchronous Stochastic Approximation

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Asymptotic Behavior of Asynchronous Stochastic Approximation

第十九届中国控制会议

作者： Hai-Tao Fang and Han- fu Chen Laboratory of systems and Control, institute of systems science. academy of mathematics and systems science. chinese academy of sciences, beijing, 100080, P. R. china

＜正＞The pathwise convergence of a distributed, asynchronous stochastic approximation（SA） scheme is analyzed. The conditions imposed on the step size and noise are the weakest in comparison with the existing ones. The step sizes in different processors are allowed to be different, and the time-delays between processors are also allowed to be different and even time-varying.

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Admission Control with Elastic QoS for Video on Demand systems

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International Journal of Automation and computing 2012年第5期9卷 467-473页

作者： fu-Shou Lin 1 Bao-Qun Yin 1,2 Jing Huang 1 Xu-Min Wu 1 1 Key Lab of Anhui Network Communication System and Control, University of science and Technology of china, Hefei 230027, china 2 National Network New Media Engineering Research Center, institute of Acoustics, chinese academy of science, beijing 100190, china Key Lab of Anhui Network Communication System and Control University of Science and Technology of China Hefei China National Network New Media Engineering Research Center Institute of Acoustics Chinese Academy of Science Beijing China

In network service systems, satisfying quality of service (QoS) is one of the main objectives. Admission control and resource allocation strategy can be used to guarantee the QoS requirement. Based on partially observable Markov decision processes (POMDPs), this paper proposes a novel admission control model for video on demand (VOD) service systems with elastic QoS. Elastic QoS is also considered in resource allocation strategy. Policy gradient algorithm is often available to find the solution of POMDP problems, with a satisfactory convergence rate. Through numerical examples, it can be shown that the proposed admission control strategy has better performance than complete admission control strategy.

关键词： Partially observable Markov decision processes (POMDPs) admission control resource allocation elastic quality of service (QoS) policy gradient

维普期刊数据库

Convergence Rate of Stochastic Approximation Algorithms in the Degenerate Case

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Convergence Rate of Stochastic Approximation Algorithms in t...

1995年中国控制会议

作者： Han-fu Chen Laboratory of systems and Control, institute of systems science, The chinese academy of sciences, beijing 100080, P. R. china

＜正＞Let f（·） be an unknown function whose root x0 is sought by stochastic approximation. This paper demonstrates the convergence rate of stochastic approximation algorithms for the degenerate case f’（x0 ） = 0. In comparison with the previous work, here no growth rate restriction is imposed on f（·）, no statistical property is required for the measurement noise, the general step size is considered and the result is obtained for the multidimensional case, which is not a straightforward extension of the one-dimensional result.

关键词： Stochastic approximation convergence rate.

ON THE STRICT EFFICIENCY IN A LOCALLYCONVEX SPACE

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systems science and mathematical sciences 1999年第1期12卷 40-44页

作者： fu Wantao (Department of mathematics, Nanchang University, Nanchang 330047, china)CHENG Yonghong (institute of systems science, Acadetnia Sinica, beijing 100080, china)

In this paper, a new concept, strictly efficient points in locally convex spaces,is introduced, and scalar characterization of a strictly efficient point is established. furthermore, we study the best approximation pr... 详细信息

关键词： Strictly efficient points base for a cone best approximation property.

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mathematics of multi-agent learning systems at the interface of game theory and artificial intelligence

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science china(Information sciences) 2024年第6期67卷 445-447页

作者： Long WANG Feng fu Xingru CHEN Center for systems and Control College of EngineeringPeking University Center for Multi-Agent Research Institute for Artificial IntelligencePeking University Department of mathematics Dartmouth College Department of Biomedical Data science Geisel School of Medicine at Dartmouth School of science Beijing University of Posts and Telecommunications

Evolutionary game theory (EGT) and artificial intelligence(AI) are two fields that,at first glance,might seem distinct,but they have notable connections and *** former focuses on the evolution of behaviors (or strategies)in a population,where individuals interact with others and update their strategies based on imitation (or social learning).

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Low-Complexity Reconstruction of Covariance Matrix in Hybrid Uniform Circular Array

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china Communications 2024年第3期21卷 66-74页

作者： fu Zihao Liu Yinsheng Duan Hongtao Information School Communication University of ChinaBeijing 100024China beijing institute of Electronic System Engineering Beijing 100854China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China beijing Radio Monitoring Station of State Radio Monitoring Center(SRMC) Beijing 100037China

Spatial covariance matrix(SCM) is essential in many multi-antenna systems such as massive multiple-input multiple-output(MIMO). For multi-antenna systems operating at millimeter-wave bands, hybrid analog-digital structure has been widely adopted to reduce the cost of radio frequency *** this situation, signals received at the antennas are unavailable to the digital receiver, and as a consequence, traditional sample average approach cannot be used for SCM reconstruction in hybrid multi-antenna systems. To address this issue, beam sweeping algorithm(BSA) which can reconstruct the SCM effectively for a hybrid uniform linear array, has been proposed in our previous works. However, direct extension of BSA to a hybrid uniform circular array(UCA)will result in a huge computational burden. To this end, a low-complexity approach is proposed in this paper. By exploiting the symmetry features of SCM for the UCA, the number of unknowns can be reduced significantly and thus the complexity of reconstruction can be saved accordingly. furthermore, an insightful analysis is also presented in this paper, showing that the reduction of the number of unknowns can also improve the accuracy of the reconstructed SCM. Simulation results are also shown to demonstrate the proposed approach.

关键词： hybrid array millimeter-wave spatial covariance matrix uniform circular array

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Special issue on electrochemical conversion and utilization of hydrogen energy

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Frontiers in Energy 2024年第3期18卷 263-264页

作者： Yun ZHENG Bo YU Xiaogang fu Jiujun ZHANG institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China State Key Laboratory of Solidification Processing Atomic Control&Catalysis Engineering LaboratorySchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

The concerns over energy crisis and climate change caused by the excessive consumption of fossil fuels and the associated emission of greenhouse gases, have driven many countries to develop policies for an energy transition into zero-carbon energy sources, essentially aiming at decarbonizing their energy systems. Among various renewable sources, hydrogen has been hailed as an ideal alternative to provide secure, cost-effective, and non-polluting energy. In recent years, there has been noteworthy progress in hydrogen electrochemical conversion and utilization techniques and devices, including water electrolyzers, proton-exchange membrane fuel cells (PEMFCs), solid oxide fuel cells (SOFCs), etc. Each of these technologies has yielded a series of encouraging advances. To showcase these recent advances, Frontiers in Energy is launching a special issue titled “electrochemical conversion and utilization of hydrogen energy”.

关键词： hydrogen energy. electrochemical

An Intelligent Framework for Resilience Recovery of FANETs with Spatio-Temporal Aggregation and Multi-Head Attention Mechanism

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Computers, Materials & Continua 2024年第5期79卷 2375-2398页

作者： Zhijun Guo Yun Sun YingWang Chaoqi fu Jilong Zhong Air Traffic Control and Navigation College Air Force Engineering UniversityXi’an710000China institute of systems Engineering Academy of Military ScienceBeijing100101China Equipment Management and UAV Engineering College Air Force Engineering UniversityXi’an710038China Defense Innovation institute Academy of Military ScienceBeijing100071China

Due to the time-varying topology and possible disturbances in a conflict environment,it is still challenging to maintain the mission performance of flying Ad hoc networks(FANET),which limits the application of Unmanned Aerial Vehicle(UAV)swarms in harsh *** paper proposes an intelligent framework to quickly recover the cooperative coveragemission by aggregating the historical spatio-temporal network with the attention *** mission resilience metric is introduced in conjunction with connectivity and coverage status information to simplify the optimization model.A spatio-temporal node pooling method is proposed to ensure all node location features can be updated after destruction by capturing the temporal network *** with the corresponding Laplacian matrix as the hyperparameter,a recovery algorithm based on the multi-head attention graph network is designed to achieve rapid *** results showed that the proposed framework can facilitate rapid recovery of the connectivity and coverage more effectively compared to the existing *** results demonstrate that the average connectivity and coverage results is improved by 17.92%and 16.96%,respectively compared with the state-of-the-art ***,by the ablation study,the contributions of each different improvement are *** proposed model can be used to support resilient network design for real-time mission execution.

关键词： Resilience cooperative mission FANET spatio-temporal node pooling multi-head attention graph network

Fault Tolerant Control for Missile Guidance Laws with Finite-Time convergence

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Fault Tolerant Control for Missile Guidance Laws with Finite...

2011 chinese Control and Decision Conference（CCDC）

作者： Zheng Zhu,Yuanqing Xia and Mengyin fu are with the Department of Automatic Control,beijing institute of Technology,beijing 100081,china..Shuo Wang is with the Lab of Complex systems and Intelligence science,institute of Automation,chinese academy of sciences.

This paper aims to develop hit-to-kill guidance laws for missile interception with actuator *** faulttolerant control schemes with sliding mode control and finitetime control are proposed for the design of guidance laws to achieve the interception in the presence of bounded target ***,simulation results are presented to illustrate the effectiveness of the control strategies.

关键词： Guidance law Sliding mode control Fault tolerant control Finite-time control