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Digital Twin-Assisted Semi-Federated Learning Framework for Industrial Edge Intelligence

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China Communications 2024年第5期21卷 314-329页

作者： Wu Xiongyue tang jianhua Marie Siew Shien-Ming Wu School of Intelligent Engineering South China University of TechnologyGuangzhou 511442China Electrical and Computer Engineering Department Carnegie Mellon UniversityPittsburghPA 15213United States

The rapid development of emerging technologies,such as edge intelligence and digital twins,have added momentum towards the development of the Industrial Internet of Things(IIo T).However,the massive amount of data generated by the IIo T,coupled with heterogeneous computation capacity across IIo T devices,and users’data privacy concerns,have posed challenges towards achieving industrial edge intelligence(IEI).To achieve IEI,in this paper,we propose a semi-federated learning framework where a portion of the data with higher privacy is kept locally and a portion of the less private data can be potentially uploaded to the edge *** addition,we leverage digital twins to overcome the problem of computation capacity heterogeneity of IIo T devices through the mapping of physical *** formulate a synchronization latency minimization problem which jointly optimizes edge association and the proportion of uploaded nonprivate *** the joint problem is NP-hard and combinatorial and taking into account the reality of largescale device training,we develop a multi-agent hybrid action deep reinforcement learning(DRL)algorithm to find the optimal *** results show that our proposed DRL algorithm can reduce latency and have a better convergence performance for semi-federated learning compared to benchmark algorithms.

关键词： digital twin edge association industrial edge intelligence(IEI) semi-federated learning

Approximate analytical solution in slow-fast system based on modified multi-scale method

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Applied Mathematics and Mechanics(English Edition) 2020年第4期41卷 605-622页

作者： Xianghong LI jianhua tang Yanli WANG Yongjun SHEN Department of Mathematics and Physics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

A simple,yet accurate modi?ed multi-scale method(MMSM)for an approximately analytical solution in nonlinear oscillators with two time scales under forced harmonic excitation is *** method depends on the classical multi-scale method(MSM)and the method of variation of *** that the forced excitation is a constant,one could easily obtain the approximate analytical solution of the simpli?ed system based on the traditional ***,this solution for the oscillator under forced harmonic excitation could be established after replacing the harmonic excitation by the constant *** certify the correctness and precision of the proposed analytical method,the van der Pol system with two scales subject to slowly periodic excitation is investigated;this system presents rich dynamical phenomena such as spiking(SP),spiking-quiescence(SP-QS),and quiescence(QS)*** approximate analytical expressions of the three types of responses are given by the MMSM,and it can be found that the precision of the new analytical method is higher than that of the classical MSM and better than that of the harmonic balance method(HBM).The results obtained by the present method are considerably better than those obtained by traditional methods,quantitatively and qualitatively,particularly when the excitation frequency is far less than the natural frequency of the system.

关键词： modified multi-scale method(MMSM) slow-fast system multi-scale method(MSM) van der Pol system

Numerical integration of rotation with geometry propagators

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International Journal of Modeling, Simulation, and Scientific Computing 2016年第3期7卷 150-170页

作者： jianhua tang Linfang Qian Qiang Yin School of Mechanical Engineering Nanjing University of Science and Technology Nanjing P.R.China

Commutator free method is an effective method for solving rotating *** examples show that the use of the proposed combining method can achieve the same order accuracy with less computation than other geometry integration ***,it is difficult to be directly applied to mechanic dynamics *** this paper,commutator free method which is often applied to rotation integration and classical Runge–Kutta(RK)method which is usually operated in Linear space are combined to solve the multi-body dynamic *** explicit Runge–Kutta coefficients are reconstructed to meet different order accuracy integration *** reconstruction method is discussed and coefficients are *** this method,the dynamic equations can be solved accurately and economically without much modification on the classical numerical ***,CG method and CF method can also be combined with adaptive RK method without many ***,the results of the examples show that with less computation,fourth-order combining method is as accurate as fourth-order Crouch–Grossman algorithm.

关键词： Runge-Kutta method geometry propagators commutator free method

Numerical Study of Parachute-Payload Land Site Distribution with Randomize Wind Gust Model

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 383-394页

作者： tang jianhua Qian Linfang Yin Qiang Jiang Li School of Mechanical Engineering Wuyi UniversityJiangmen 529020 P. R. China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 P.R. China

A parachute-payload model with randomize wind gust is developed to study the landing accuracy of the parachute decelerator system,which can be exactly described by the landing site *** research focuses on the steady descent phase of the parachute descent process,so the parachute and the payload suspension formulation during the phase are mainly *** addition,since the wind effects have a significant impact on the land site distribution of the passive decelerator system and it is difficult to obtain the exact wind profile in practice,major features of parachute-payload system are studied via the randomized wind gust *** the randomized wind gust formulation is adopted,the wind effect can be considered without the exact wind gust profile and the parachute aerodynamic simulation can be fulfilled with ***,the model is validated and discussed,and the parachute land site distributions with different wind randomize profiles are presented for *** results show that when parachute is less stable,the land site tends to have a larger variance.

关键词： parachute decelerator system wind profile Monte Carlo land site distribution

Migration and population structure characteristics of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea

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Acta Oceanologica Sinica 2016年第6期35卷 34-41页

作者： XIONG Ying ZHONG Xiaming tang jianhua YANG Jian Wuxi Fisheries College Nanjing Agricultural UniversityWuxi 214182China Jiangsu Marine Fisheries Research Institute Nantong 226007China Key Laboratory of Fishery Ecological Environment Assessment and Resource Conservation in Middle and Lower Reaches of the Yangtze River Freshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi 214081China

Monthly fishery survey data of the small yellow croaker Larimichthys polyactis in the southern Yellow Sea from2003 and 2013 were employed to evaluate the variation in the resource distribution and biological characteristics（especially body length and sex ratio） in the population on a decadal *** results indicated that the small yellow croaker migrated from the Shawai fishing ground to the Dasha fishing ground in spring and was mainly distributed in the central and western parts of the Dasha fishing ground in April and *** polyactis in the Dasha fishing ground migrated eastward to offshore wintering grounds in autumn and reached the central Dasha fishing ground in October and *** small yellow croaker entered the western waters of the Shawai fishing ground in winter.A large number of age 0＋ fish occurred in the Shawai and Jiangwai fishing grounds in October of 2003 and *** body lengths of the spawning stock and wintering stock in 2013 were larger than those in 2003,and the monthly sex ratios（female to male） were significantly less than 1 in both *** monthly distribution of this fish in the southern Yellow Sea was consistent with a previous finding that ＂the stock migrated between the wintering grounds in the west of Jeju Island and the Lüsi spawning grounds＂ but tended to move more northward,with the spawning grounds extending *** the past decade,body length variation experienced a decline after an increase,rather than a steady *** sex ratio in the single-stick stow net showed a tendency to increase over the decade,but was either less than or more than 1 depending on the fishing gear;therefore,further studies should be conducted to determine the sex structure.

关键词： small yellow croaker resource distribution migration body length sex ratio

Elemental Sulfur and Dimethyl Sulfoxide-Promoted Oxidative Cyclization of Trifluoroacetimidohydrazides with Methylheta-renes for the Synthesis of 3-Hetaryl-5-trifluoromethyl-1,2,4-triazoles

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Chinese Journal of Chemistry 2021年第12期39卷 3443-3447页

作者： Jiajun Zhang jianhua tang Zhengkai Chen Xiao-Feng Wu Department of Chemistry Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhouZhejiang 310018China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning 116023China Leibniz-lnstitutfurKatalysee.V. Albert-Einstein-Stra6e 29a18059 RostockGermany

A metal-free approach for the synthesis of 3-hetaryl-5-trifluoromethyl-1,2,4-triazoles via sulfur/dimethyl sulfoxide-promoted oxidative cyclization of readily available trifluoroacetimidohydrazides with methylhetarenes has been *** transformation proceeds in cascade sulfur-mediated generation of thioaldehyde,condensation,intramolecular cyclization and oxidative aromatization sequence.

关键词： Heterocycles Oxidation Solvent effects Sulfur Trifluoroacetimidohydrazides

Early life migration and population discrimination of the small yellow croaker Larimichthys polyactis from the Yellow Sea: inferences from otolith Sr/Ca ratios

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Journal of Oceanology and Limnology 2022年第2期40卷 818-829页

作者： Dade SONG Ying XIONG Tao JIANG Jian YANG Xiaming ZHONG jianhua tang College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Jiangsu Marine Fisheries Research Institute Nantong 226007China Key Laboratory of Fishery Ecological Environment Assessment and Resource Conservation in Middle and Lower Reaches of Yangtze River Freshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi 214081China

The small yellow croaker Larimichthys polyactis is a benthic marine fish species of high ecological and commercial importance and is widely distributed in the northwestern Pacifi c Ocean,especially in the Chinese coastal waters of the Bohai,Yellow,and East China *** a highly migratory species,the whole life migration of *** has been intensively ***,knowledge about its early life migration is scarce,and population divisions are inconsistent,limiting the ability of fishery scientists and administrators to evaluate the design and potential benefits of thorough conservation and resource-management *** the present study,otolith Sr/Ca was analyzed to investigate the early migratory patterns and discriminate the populations of *** in the Yellow Sea,including two spawning groups and one overwintering *** variation in Sr/Ca ratios of ontogenetic growth zones,including the nucleus(N),larval(L),metamorphosis(M),juvenile(J),and edge(E)zones,was measured by electron probe *** variation in Sr/Ca ratios in early developmental growth zones was generally characterized by an evident downward trend from the N to J zone,which suggests that the early migratory pattern of *** might be from inshore to nearshore *** discriminant analysis,based on the otolith Sr/Ca ratios of the N,L,M,and J zones,allowed the successful discrimination of the two populations,namely,the northern and southern Yellow Sea groups,whose diff erences were mainly reflected in the L and J *** with previous studies,the traditional geographic boundaries(34°N)separating these two populations might be moving *** application of otolith Sr/Ca ratios based on ontogenetic stage could improve our understanding of the migration and population discrimination of *** from the Yellow Sea.

关键词： otolith microchemistry Larimichthys polyactis early life migration population discrimination the Yellow Sea

Age of Loop Information with Flexible Transmission Enabled Communication and Control Co-Design in Industrial IoT

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China Communications 2024年第11期21卷 40-55页

作者： Chen Fangfang tang jianhua Yin Zihang Shien-Ming Wu School of Intelligent Engineering South China University of TechnologyGuangzhou 511442China China Academy of Information and Communications Technology Beijing 100083China

Precise and low-latency information transmission through communication systems is essential in the Industrial Internet of Things(IIoT).However,in an industrial system,there is always a coupling relationship between the control and communication *** improve the system's overall performance,exploring the co-design of communication and control systems is *** this work,we propose a new metric±Age of Loop Information with Flexible Transmission(AoLI-FT),which dynamically adjusts the maximum number of uplink(UL)and downlink(DL)transmission rounds,thus enhancing reliability while ensuring *** goal is to explore the relationship between AoLI-FT,reliability,and control convergence rate,and to design optimal blocklengths for UL and DL that achieve the desired control convergence *** address this issue,we first derive a closed-form expression for the upper bound of ***,we establish a relationship between communication reliability and control convergence rates using a Lyapunov-like ***,we introduce an iterative alternating algorithm to determine the optimal communication and control *** numerical results demonstrate the significant performance advantages of our proposed communication and control co-design strategy in terms of latency and control cost.

关键词： age of loop information co-design flexible transmission IIoT

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健康医疗大数据共享风险及法治因应

学习与实践 2023年第8期 54-60页

作者：汤建华华中农业大学文法学院湖北武汉430070

健康医疗与人工智能、区块链等技术的深度融合,促使健康医疗服务模式发生了根本性转变,产生了国家与个人对健康医疗大数据共享的迫切需求。但健康医疗大数据共享会引发隐私权、版权、公共安全等风险,这些风险不仅涉及个体利益,也涉及公... 详细信息

健康医疗与人工智能、区块链等技术的深度融合,促使健康医疗服务模式发生了根本性转变,产生了国家与个人对健康医疗大数据共享的迫切需求。但健康医疗大数据共享会引发隐私权、版权、公共安全等风险,这些风险不仅涉及个体利益,也涉及公共利益。风险所涉法益的多元化,加剧了健康医疗大数据共享风险治理的难度,其障碍包括主体风险意识不足、缺乏统一法律标准、协同共治机制不完善等方面。据此,应从风险意识培育、法律制度完善、运行机制优化三个方面,不断优化健康医疗大数据共享风险共治策略,实现健康医疗大数据共享风险治理的法治化目标。

关键词：大数据健康医疗风险治理开放共享法治