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Decentralised federated learning with adaptive partial gradient aggregation

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CAAI Transactions on Intelligence Technology 2020年第3期5卷 230-236页

作者： Jingyan Jiang liang hu College of Computer Science and Technology Jilin UniversityChangchun 130012People’s Republic of China

Federated learning aims to collaboratively train a machine learning model with possibly geo-distributed workers,which is inherently communication *** achieve communication efficiency,the conventional federated learning algorithms allow the worker to decrease the communication frequency by training the model locally for multiple *** federated learning architecture,inherited from the parameter server design,relies on highly centralised topologies and large nodes-to-server bandwidths,and convergence property relies on the stochastic gradient descent training in local,which usually causes the large end-to-end training latency in real-world federated learning ***,in this study,the authors propose the adaptive partial gradient aggregation method,a gradient partial level decentralised federated learning,to tackle this *** FedPGA,they propose a partial gradient exchange mechanism that makes full use of node-to-node bandwidth for speeding up the communication ***,an adaptive model updating method further reduces the convergence rate by adaptive increasing the step size of the stable direction of gradient *** experimental results on various datasets demonstrate that the training time is reduced up to 14×compared to baselines without accuracy degrade.

关键词： gradient aggregation server

Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity

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Chinese Physics B 2021年第6期30卷 346-358页

作者： liang hu Xiang-Ming hu Qing-Ping hu College of Physical Science and Technology Central China Normal UniversityWuhan 430079China

For a three-level atom, two nondegenerate(even microwave and optical) electric dipole transitions are usually allowed;for either of these, the fluorescence spectra are well-described in terms of spontaneous transitions from a triplet of dressed sublevels to an adjacent lower-lying triplet. When the three dressed sublevels are equally spaced from each other, a remarkable feature known as degenerate cascade fluorescence takes place, which displays a five-peaked structure. We show that a single cavity can make all the spectral lines extremely narrow, whether they arise from cavity-coupled or cavity-free transitions. This effect is based on intrinsic cascade lasing feedback and makes it possible to use a single microwave cavity(even a bad cavity) to narrow the spectral lines in the optical frequency regime.

关键词： resonance fluorescence narrow spectral lines microwave cavity

Multi-loop adaptive internal model control based on a dynamic partial least squares model

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 190-200页

作者： Zhao ZHAO Bin hu Jun liang State Key Lab of Industrial Control Technology Department of Control Seienee & Engineering Zhejiang University Hangzhou 310027 China

A multi-loop adaptive internal model control (IMC) strategy based on a dynamic partial least squares (PLS) frame-work is proposed to account for plant model errors caused by slow aging,drift in operational conditions,or environmental *** PLS decomposition structure enables multi-loop controller design within latent spaces,a multivariable adaptive control scheme can be converted easily into several independent univariable control loops in the PLS *** each latent subspace,once the model error exceeds a specific threshold,online adaptation rules are implemented separately to correct the plant model mismatch via a recursive least squares (RLS) *** the IMC extracts the inverse of the minimum part of the internal model as its structure,the IMC controller is self-tuned by explicitly updating the parameters,which are parts of the internal *** parameter convergence and system stability are briefly analyzed,and proved to be ***,the proposed control scheme is tested and evaluated using a widely-used benchmark of a multi-input multi-output (MIMO) system with pure delay.

关键词： Partial least squares (PLS) Adaptive internal model control (IMC) Recursive least squares (RLS)

Applications of chemical imaging techniques in paleontology

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National Science Review 2019年第5期6卷 1040-1053页

作者： Yanhong Pan liang hu Tao Zhao CAS Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of Sciences

Chemical imaging techniques, based on a combination of microscopy and spectroscopy, are designed to analyse the composition and spatial distribution of heterogeneous chemical complexes within a *** the last few decades, it has become an increasingly popular tool for characterizing trace elements,isotopic information and organic biomarkers(molecular biosignatures) found in ***, we introduce the analytical principle of each technique and the interpretation of the chemical signals, followed by a review of the main applications of these techniques in *** also demonstrate that each technique is associated with pros and cons, and the current limitations and obstacles associated with the use of each specific technique should be taken into account before being applied to fossil ***, we propose that, due to the rapid advances in the available technology and overall trends towards more multi-disciplinary studies in paleontology, chemical imaging techniques can be expected to have broader applications in paleontology in the near future.

关键词： trace elements isotopic information organic biomarkers fossil materials limits and obstacles

PROBLEMS OF U-SHAPED BELLOWS WITH NONLINEAR DEFORM TION OF LARGE AXISYMMETRICAL DEFLECTION(Ⅰ)--COUNTING NONLINEAR DEFORMATIONS OF RING SHELLS AND COMPRESSED ANGLE OF BELLOWS

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Applied Mathematics and Mechanics(English Edition) 1993年第3期14卷 253-267页

作者： hu liang Shanghai Institute of Applied Mathematics and Mechanics Shanghai University of Technology Shanghai

This paper follows the work of[1,2].There are some progress in dealing with moderately small rotations(the squares of rotation angles are the order of magnitude of strains)of middle surface normals of inside and outside ring shells and compressed angle of *** results agree with experiments *** bellow design,the method given in this paper is of practical value and the discussion of the influence of compressed angle on characteristic relation is helpful.

关键词： U-shaped bellows large axisymmetrical deflection compressed angle

ON PROBLEMS OF U-SHAPED BELLOWS WITH NONLINEAR DEFORMATION OF LARGE AXISYMMETRICAL DEFLECTION(Ⅱ)——COUNTING VARIATION OF THICKNESS DISTRIBUTION

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Applied Mathematics and Mechanics(English Edition) 1993年第6期14卷 559-564页

作者： hu liang Shanghai University of Technology Shanghai Institute of Applied Mathematics and Mechanics Shanghai

On the basis of paper[1],assuming the logarithm of thickness at arbitrary point on a U-shaped bellows meridian is linear with the logarithm of distance between that point and axis of symmetry,perturbation solutions of the corresponding problems of large axisymmetrical deflection are *** effects of thickness distribution variation,which result from technology factors,on stiffness of bellows are discussed.

关键词： U-shaped bellows variation of thickness distribution,decay rate

Quantum coherence of multiqubit states in correlated noisy channels

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Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 116-119页

作者： Ming-liang hu Heng Fan School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China Institute of Physics Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Quantum coherence captures the essential nature of a quantum system[1]and can serve as a resource for quantum information processing[2].Recent studies also provide evidence that long-lived quantum coherence is crucial for overcoming the classical limits of measurement accuracy in quantum metrology[3-5].However,in practice,the unavoidable interaction of a principal system with its surroundings results in decoherence in most ***,the advantage of quantum coherence in empowering the performance of quantum tasks will disappear in a very short time interval,which remains one of the major obstacles in its potential application.

关键词： quantum system disappear

Effects of External Electric Field on AlN Precipitation and Recrystallization Texture of Deep-drawing 08Al Killed Steel Sheet

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Journal of Materials Science & Technology 2006年第6期22卷 747-750页

作者： Xiang ZHAO Zhuochao hu liang ZUO Key Laboratory for Anisotropy Design and Texture Engineering of Materials （Ministry of Education） Northeastern University Shenyang 110004 China

The effects of an electric field on AIN precipitation and recrystallization texture were investigated. Cold-rolled 08Al killed steel sheets were annealed at 550℃ according to the two-step processes, for various maintaining times, with and without applying an electric field. It was found that the electric field promotes the precipitation of the second phase （AlN particles）, strengthens the γ-fiber and weakens the α-fiber texture component in the recrystallized specimens. A possible explanation for the reinforcement of γ-fiber texture by the electric field is that the second phase AIN particle promotes the growth of γ-fiber at the expense of differently oriented grains.

关键词： Electric field annealing AlN Recrystallization texture 08Al killed steel sheet

Limits on sequential sharing of nonlocal advantage of quantum coherence

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 26-35页

作者： Ming-liang hu Jia-Ru Wang Heng Fan School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China Institute of Physics Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Sequential sharing of nonlocal correlation is inherently related to its *** address the question as to how many observers can share the nonlocal advantage of quantum coherence(NAQC)in a(d×d)-dimensional state,where d is a prime or a power of a *** first analyze the trade-off between disturbance and information gain of the general d-dimensional unsharp *** in a scenario where multiple Alices perform unsharp measurements on one party of the state sequentially and independently and a single Bob measures coherence of the conditional states on the other party,we show that at most one Alice can demonstrate NAQC with *** limit holds even when considering the weak measurements with optimal pointer *** results may shed light on the interplay between nonlocal correlations and quantum measurements on high-dimensional systems and the hierarchy of different quantum correlations.

关键词： quantum coherence quantum correlation unsharp measurement

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