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Set-Membership Filtering Subject to Impulsive Measurement Outliers:A Recursive Algorithm

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IEEE/CAA Journal of Automatica Sinica 2021年第2期8卷 377-388页

作者： Lei Zou Zidong Wang hang geng Xiaohui Liu with the Department of Computer Science Brunel University LondonUxbridgeMiddlesexUB83PHUnited Kingdom

This paper is concerned with the set-membership filtering problem for a class of linear time-varying systems with norm-bounded noises and impulsive measurement outliers.A new representation is proposed to model the measurement outlier by an impulsive signal whose minimum interval length(i.e.,the minimum duration between two adjacent impulsive signals)and minimum norm(i.e.,the minimum of the norms of all impulsive signals)are larger than certain thresholds that are adjustable according to engineering *** order to guarantee satisfactory filtering performance,a so-called parameter-dependent set-membership filter is put forward that is capable of generating a time-varying ellipsoidal region containing the true system ***,a novel outlier detection strategy is developed,based on a dedicatedly constructed input-output model,to examine whether the received measurement is corrupted by an ***,through the outcome of the outlier detection,the gain matrix of the desired filter and the corresponding ellipsoidal region are calculated by solving two recursive difference ***,the ultimate boundedness issue on the time-varying ellipsoidal region is thoroughly ***,a simulation example is provided to demonstrate the effectiveness of our proposed parameter-dependent set-membership filtering strategy.

关键词： Boundedness analysis impulsive measurement outliers parameter-dependent filter set-membership filtering time-varying systems

川西锦鸡儿灌木扩张对高寒草地土壤有机碳矿化的影响

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生态学报 2024年第16期44卷 7150-7159页

作者：黎萱耿行高永恒陈东毅李良安王平甘肃农业大学资源与环境学院兰州730070 中国科学院成都生物研究所成都610041 贵州省黔西南布依族苗族自治州能源局兴义562400

以川西锦鸡儿(Caragana erinacea)灌丛草地为研究对象,分析川西锦鸡儿灌木不同扩张程度下(原生草地、中度灌木扩张和重度灌木扩张)0—10 cm、10—20 cm和20—40 cm土壤理化性质及土壤有机碳(SOC)矿化的变化特征,探究灌木扩张对高寒草地... 详细信息

以川西锦鸡儿(Caragana erinacea)灌丛草地为研究对象,分析川西锦鸡儿灌木不同扩张程度下(原生草地、中度灌木扩张和重度灌木扩张)0—10 cm、10—20 cm和20—40 cm土壤理化性质及土壤有机碳(SOC)矿化的变化特征,探究灌木扩张对高寒草地SOC矿化的影响机制。结果表明:(1)灌木扩张对土壤全氮(TN)含量无显著影响,显著增加各土层SOC含量,显著增加10—20 cm土壤矿物矿质结合态有机碳(MAOC)含量及其占SOC比例,显著减小0—20 cm土壤含水量(SWC)。重度灌木扩张显著增加10—40 cm土壤微生物生物量碳(MBC)含量,显著减小0—10 cm土层MBC/SOC和MAOC/SOC。(2)不同土壤深度对SOC矿化激发效应存在差异,灌木扩张显著降低0—10 cm土壤有机碳潜在矿化碳库(C_(0)),重度灌木扩张显著增加10—40 cm土层C_(0)。(3)相关性分析表明,SOC矿化过程与SWC、SOC、TN、MBC和MAOC显著正相关,与MAOC/SOC显著负相关。逐步回归分析表明,SOC矿化与MBC和SWC相关性最强,可以有效解释C_(0)变化的91.1%。由此推断,川西锦鸡儿灌木扩张后该区域SOC矿化的变化,主要是由于灌木扩张影响MBC和SWC所致,土壤浅表水分减少影响微生物活动使得SOC矿化减弱,灌木根系发育土层微生物量增多使得SOC矿化增强。

关键词：土壤有机碳矿化灌木扩张高寒草地川西锦鸡儿

Variance-Constrained Filtering Fusion for Nonlinear Cyber-Physical Systems With the Denial-of-Service Attacks and Stochastic Communication Protocol

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 978-989页

作者： hang geng Zidong Wang Yun Chen Xiaojian Yi Yuhua Cheng IEEE School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China Department of Computer Science Brunel University LondonUxbridgeMiddlesexUB83PHUnited Kingdom Key Laboratory for IoT and Information Fusion Technology of Zhejiang School of AutomationHangzhou Dianzi UniversityHangzhou 310018China School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

In this paper,a new filtering fusion problem is studied for nonlinear cyber-physical systems under errorvariance constraints and denial-of-service *** prevent data collision and reduce communication cost,the stochastic communication protocol is adopted in the sensor-to-filter channels to regulate the transmission order of *** sensor is allowed to enter the network according to the transmission priority decided by a set of independent and identicallydistributed random *** the defenders’view,the occurrence of the denial-of-service attack is governed by the randomly Bernoulli-distributed *** the local filtering stage,a set of variance-constrained local filters are designed where the upper bounds(on the filtering error covariances)are first acquired and later minimized by appropriately designing filter *** the fusion stage,all local estimates and error covariances are combined to develop a variance-constrained fusion estimator under the federated fusion ***,the performance of the fusion estimator is examined by studying the boundedness of the fused error covariance.A simulation example is finally presented to demonstrate the effectiveness of the proposed fusion estimator.

关键词： Cyber-physical system(CPS) denial-of-service attack stochastic communication protocol(SCP) variance-constrained filtering fusion

The UIO-based LMMSE Filter for NCSs With Packet Dropout 25th

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The UIO-based LMMSE Filter for NCSs With Packet Dropout

A Review on Intelligent Detection and Classification of Power Quality Disturbances:Trends,Methodologies,and Prospects

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作者： hang geng Yan Liang Xiaojing Zhang School of Electronics Northwestern Polytechnical University

ISBN: (纸本)9781467355339

This paper puts forward a UIO-based linear-minimum-mean-square-error （LMMSE） estimation problem of a class of the net-worked control systems （NCSs）, and the disturbance of the state and its measurements is zero mean white noise with covariance being;An unknown input observer （UIO） is established stemmed from a linear multi-sensor model and a linear time-varying estimation error system is proposed where packet dropouts are presented as zero-mean white input noise. Based on the error system, a LMMSE estimator is set up to obtain an error estimate of the state. By compensating the primary estimate of the UIO with the error estimate of the LMMSE, a much more accurate estimate of the state is achieved. A numerical example of distributive target tracking is given to illustrate the proposed estimator.

关键词： Linear-minimum-mean-square-error filter Multi-sensor Fusion Packet dropout Networked control systems Unknown input observers.

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Computer Modeling in Engineering & Sciences 2023年第11期137卷 1345-1379页

作者： Yanjun Yan Kai Chen hang geng Wenqian Fan Xinrui Zhou School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu611731China

With increasing global concerns about clean energy in smart grids,the detection of power quality disturbances(PQDs)caused by energy instability is becoming more and more *** is well acknowledged that the PQD effects on power grid equipment are destructive and hazardous,which causes irreversible damage to underlying electrical/electronic equipment of the concerned intelligent *** order to ensure safe and reliable equipment implementation,appropriate PQDdetection technologiesmust be adopted to avoid such adverse *** paper summarizes the newly proposed and traditional PQD detection techniques in order to give a quick start to new researchers in the related field,where specific scenarios and events for which each technique is applicable are also clearly ***,comments on the future evolution of PQD detection techniques are *** the published review articles,this paper focuses on the new techniques from the last five years while providing a brief recap on traditional PQD detection techniques so as to supply researchers with a systematic and state-of-the-art review for PQD detection.

关键词： Power quality disturbance renewable energy feature extraction and optimization intelligent classification signal processing smart grids

Conductor Arrangement and Phase Sequence Optimization Scheme for 500 kV Four-Circuit Transmission Lines on Same Tower

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Energy Engineering 2023年第10期120卷 2287-2306页

作者： Deng Lu Xujun Lang Bo Yang Ziyang Li hang geng Power Grid Design and Research Institute Shandong Electric Power Engineering Consulting Institute Co.Ltd.Jinan250012China School of Electrical Engineering Shandong UniversityJinan250061China

The four-circuit parallel line on the same tower effectively solves the problems faced by the line reconstruction and construction under the condition of the increasing shortage of transmission *** the conductor and phase sequence arrangement of multiple transmission lines is conducive to improving electromagnetic and electrostatic coupling caused by electromagnetic *** paper uses the ATP-EMTP simulation software to build a 500 kV multi-circuit transmission line on the same *** stimulates the induced voltage and current values of different line lengths,tower spacing,vertical and horizontal spacing between different circuits,phase sequence arrangement,and nominal tower ***,use the BP neural network optimized by a genetic algorithm to predict the induced voltage and current under the unknown conductor and phase sequence ***,based on multi-objective particle swarm algorithm to construct the optimization model of conductor arrangement scheme of overhead transmission line,combined with electromagnetic environment control index,determine the optimal conductor arrangement scheme by the size of particle fitness function,a significant reduction in induced voltages and currents between transmission lines and the four-circuit conductor layout scheme meeting the requirements of the electromagnetic environment is obtained,which provides a reference for the tower design of the transmission station project.

关键词： Spatial arrangement phase sequence arrangement genetic algorithm BP neural network multi-objective particle swarm algorithm

慕课在普通外科住院医师规范化培训中的应用效果

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中国继续医学教育 2024年第14期16卷 97-101页

作者：么荣荣耿航杨成鹏田浩佳木斯大学临床医学院黑龙江佳木斯154002

目的分析慕课在普通外科住院医师规范化培训中的应用效果。方法选择2021年1月—2022年1月在佳木斯大学院临床医学院轮转的100名普通外科住培医师为研究对象,采用随机数字表法分为对照组(传统临床教学模式)和观察组(慕课结合传统临床教... 详细信息

目的分析慕课在普通外科住院医师规范化培训中的应用效果。方法选择2021年1月—2022年1月在佳木斯大学院临床医学院轮转的100名普通外科住培医师为研究对象,采用随机数字表法分为对照组(传统临床教学模式)和观察组(慕课结合传统临床教学模式),每组50名。比较2组的评判性思维、理论考核、操作技能、手术技巧、医患沟通能力评分及满意度。结果开课前,2组住培医师的评判性思维评分比较,差异无统计学意义(P>0.05);开课后,观察组住培医师的评判性思维评分高于对照组,差异有统计学意义(P<0.05)。观察组住培医师的理论考核、操作技能、手术技巧、医患沟通能力评分[(91.32±5.23)分、(94.66±3.54)分、(8.96±1.15)分、(9.32±0.23)分]高于对照组[(86.69±4.56)分、(88.67±5.64)分、(7.01±1.12)分、(7.69±1.56)分],差异均有统计学意义(P<0.05)。观察组住培医师的满意度高于对照组,差异有统计学意义(P<0.05)。结论慕课对普通外科住院医师规范化培训的综合应用价值更高,在对住培医师的临床教学中,采用慕课的教学模式能进一步提升外科住院医师的批判性思维、理论知识以及实践技能,同时外科住院医师对培训结果的满意度更高,该临床教学模式的综合价值较高。

关键词：慕课普通外科住院医师规范化培训理论知识操作技能手术技巧

CPT: a pre-trained unbalanced transformer for both Chinese language understanding and generation

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Science China(Information Sciences) 2024年第5期67卷 43-55页

作者： Yunfan SHAO Zhichao geng Yitao LIU Junqi DAI hang YAN Fei YANG Zhe LI Hujun BAO Xipeng QIU School of Computer Science Fudan University Shanghai Key Laboratory of Intelligent Information Processing Fudan University Zhejiang Lab

In this paper, we take the advantage of previous pre-trained models(PTMs) and propose a novel Chinese pre-trained unbalanced transformer(CPT). Different from previous Chinese PTMs, CPT is designed to utilize the shared knowledge between natural language understanding(NLU) and natural language generation(NLG) to boost the performance. CPT consists of three parts: a shared encoder, an understanding decoder, and a generation decoder. Two specific decoders with a shared encoder are pretrained with masked language modeling(MLM) and denoising auto-encoding(DAE) tasks, *** the partially shared architecture and multi-task pre-training, CPT can(1) learn specific knowledge of both NLU or NLG tasks with two decoders and(2) be fine-tuned flexibly that fully exploits the potential of the model. Moreover, the unbalanced transformer saves the computational and storage cost, which makes CPT competitive and greatly accelerates the inference of text generation. Experimental results on a wide range of Chinese NLU and NLG tasks show the effectiveness of CPT.

关键词： pre-trained model transformer language model generation unified model

Natural sources,refined extraction,biosynthesis,metabolism,and bioactivities of dietary polymethoxyflavones(PMFs)

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Food Science and Human Wellness 2024年第1期13卷 27-49页

作者： Renyou Gan Yi Liu hang Li Yu Xia Huan Guo Fang geng Qiguo Zhuang Huabin Li Dingtao Wu Research Center for Plants and Human Health Institute of Urban AgricultureChinese Academy of Agricultural SciencesChengdu National Agricultural Science and Technology CenterChengdu 610213China Key Laboratory of Coarse Cereal Processing Ministry of Agriculture and Rural AffairsSichuan Engineering and Technology Research Centre of Coarse Cereal IndustralizationSchool of Food and Biological EngineeringChengdu UniversityChengdu 610106China China-New Zealand Belt and Road Joint Laboratory on Kiwifruit Sichuan Provincial Academy of Natural Resource SciencesChengdu 610213China Guangdong Provincial Key Laboratory of Food Nutrition and HealthSchool of Public HealthSun Yat-sen UniversityGuangzhou 510080China

Polymethoxyflavones(PMFs)are a type of uncommon dietary flavonoids,characterized by more than one methoxy group,which exist in limited plant species,like Citrus species and Kaempferia *** addition,different PMFs,such as nobiletin,sinensetin,tangeretin,and casticin,have been isolated from these natural *** have received increasing attention due to their multiple bioactivities,such as antioxidant,anti-inflammatory,anti-cancer,metabolic regulatory,immunoregulatory,neuroprotective,and skin protective *** bioactivities of PMFs should be associated with the regulation of critical molecular targets and the interaction with gut *** order to provide a comprehensive and updated review of PMFs,their natural sources,refined extraction,biosynthesis,metabolism,and bioactivities are summarised and discussed,with the emphasis on the molecular mechanisms of PMFs on regulating different chronic ***,PMFs may be promising flavonoids to the forefront of nutraceuticals for the prevention and/or treatment of certain human chronic diseases.

关键词： Nobiletin O-Methyltransferases Gut microbiota Bioactivities Molecular mechanism