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Data-Driven Control of Distributed Event-Triggered Network Systems

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IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 351-364页

作者： Xin Wang Jian sun Gang Wang Frank Allgower Jie Chen the National Key Laboratory of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of TechnologyBeijing 100081 the Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China IEEE the Institute for Systems Theory and Automatic Control University of StuttgartStuttgart 70550Germany the Department of Control Science and Engineering Tongji UniversityShanghai 201804 the National Key Laboratory of Autonomous Intelligent Unmanned Systems Beijing Institute of TechnologyBeijing 100081China

The present paper deals with data-driven event-triggered control of a class of unknown discrete-time interconnected systems(*** systems).To this end,we start by putting forth a novel distributed event-triggering transmission strategy based on periodic sampling,under which a model-based stability criterion for the closed-loop network system is derived,by leveraging a discrete-time looped-functional *** the model-based criterion with a data-driven system representation recently developed in the literature,a purely data-driven stability criterion expressed in the form of linear matrix inequalities(LMIs)is ***,the data-driven stability criterion suggests a means for co-designing the event-triggering coefficient matrix and the feedback control gain matrix using only some offline collected state-input ***,numerical results corroborate the efficacy of the proposed distributed data-driven event-triggered network system(ETS)in cutting off data transmissions and the co-design procedure.

关键词： Data-driven control distributed event-triggered network system(ETS) linear matrix inequalitie(LMI) looped-functional stability

Computing polynomial univariate representations of zero-dimensional ideals by Grbner basis

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Science China Mathematics 2012年第6期55卷 1293-1302页

作者： MA XiaoDong sun Yao WANG DingKang KLMM Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China

Rational Univariate Representation （RUR） of zero-dimensional ideals is used to describe the zeros of zero-dimensional ideals and RUR has been studied extensively. In 1999, Roullier proposed an efficient algorithm to compute RUR of zero-dimensional ideals. In this paper, we will present a new algorithm to compute Polynomial Univariate Representation （PUR） of zero-dimensional ideals. The new algorithm is based on some interesting properties of Grobner basis. The new algorithm also provides a method for testing separating elements.

关键词： RUR PUR zero-dimensional ideals Grobner basis

Spatiotemporal evolution and driving factors of the rural settlements in the mountain-plain transitional zone

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International Journal of Agricultural and Biological Engineering 2022年第2期15卷 149-155页

作者： Daoliang sun Buting Hong Ping Ren College of Geography and Resources Science Sichuan Normal UniversityChengdu 610066SichuanChina Key Lab of Land Resources Evaluation and Monitoring in Southwest Ministry of EducationSichuan Normal UniversityChengdu 610066SichuanChina Collaborative Innovation Center for Land Resource Development and Protection Sichuan Normal UniversityChengdu 610066SichuanChina Xiangyang Urban Design and Planning Research Institute Xiangyang 441000HubeiChina

Identifying the spatiotemporal evolution characteristics of rural settlements and their driving factors is of great significance to layout optimization of rural settlements,intensive and economical use of rural land,and preparation of land space *** on the mountain-plain transitional zone of Dujiangyan City,China,as the study area,this paper employs methods including landscape pattern index,kernel density estimation,average nearest neighbor index,and Geodetector to quantitatively analyze the spatiotemporal layout evolution characteristics of rural settlements and relevant driving factors in Dujiangyan City over the last *** four main findings are as ***,land use area of rural settlements and the quantity of patches in Dujiangyan exhibited synchronous changes during *** class area(CA)increased from 6161.43 to 7265.43 hm^(2),then declined to 7043.01 hm^(2),and the number of patches(NP)increased from 16543 to 26018,and then declined to ***,the maximum kernel density estimation values in the east and southeast of Dujiangyan City increased remarkably from 48.34 to 74.69 per hm^(2) during ***,the average nearest neighbor index of rural settlements continually decreased in the foregoing 10 years,indicating a higher concentration of rural ***,production and living conditions are the main driving factors of dynamic change in land use in rural settlements,while the impact of socio-economic factors is relatively *** others,the p-value of road accessibility is 0.057,and the impact p-value of land slope is 0.035.

关键词： rural settlement spatiotemporal evolution driving factors geodetector

Line Fault Detection of DC Distribution Networks Using the Artificial Neural Network

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Energy Engineering 2023年第7期120卷 1667-1683页

作者： Xunyou Zhang Chuanyang Liu Zuo sun Country College of Mechanical and Electrical Engineering Chizhou UniversityChizhou247000China School of Electrical Engineering Southeast UniversityNanjing210096China College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing211106China

ADC distribution network is an effective solution for increasing renewable energy utilization with distinct benefits,such as high efficiency and easy ***,a sudden increase in the current after the occurrence of faults in the network may adversely affect network *** study proposes an artificial neural network(ANN)-based fault detection and protection method for DC distribution *** ANN is applied to a classifier for different faults ontheDC *** backpropagationneuralnetwork is used to predict the line current,and the fault detection threshold is obtained on the basis of the difference between the predicted current and the actual *** proposed method only uses local signals,with no requirement of a strict communication *** experiments are conducted for the proposed algorithm on a two-terminal DC distribution network modeled in the PSCAD/EMTDC and developed on the MATLAB *** results confirm that the proposed method can accurately detect and classify line faults within a few milliseconds and is not affected by fault locations,fault resistance,noise,and communication delay.

关键词： Artificial neural network DC distribution network fault detection

Pollination and seed dispersal of Aquilaria sinensis(Lour.)Gilg(Thymelaeaceae):An economic plant species with extremely small populations in China

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Plant Diversity 2016年第5期38卷 227-232页

作者： Gao Chen Changqiu Liu Weibang sun Kunrning Botanical Garden Kunrning Institute of BotanyChinese Academy of SciencesKunrning 650201YunnanChina Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina

Pollination and seed dispersal in angiosperms have long been investigated in order to understand the coevolution of plants and ***,the signals from flowers and/or seeds to attract pollinators and/or seed dispersers have received comparatively little *** this study,the pollination biology and seed dispersal of the vulnerable agarwood plant Aquilaria sinensis(Lour.) Gilg,a traditional medicinal plant in China,was studied in its natural distribution *** reproductive tactics of *** were studied in detail by employing various tests dealing with fruit set and also seed *** headspace extraction followed by GC-MS analysis was also performed in order to reveal the composition of floral *** results showed that noctuids and pyralids are the most effective pollinators of pollinator-dependent *** main compounds of the floral scent were(E,E)-α-Farnesene(61.9 ± 3.2%),trans-Ocimene(16.6 ± 1.2%),and Benzyl salicylate(4.6 ± 1.1%).The results obtained from seed dispersal experiments indicate that hornets are effective seed dispersers and they may play an important role in long-distance seed dispersal of *** on our findings,we recommend several protection methods for this threatened agarwood plant in China.

关键词： Aquilaria GC-MS Pollination Pyralidae Seed dispersal Vespa

Numerical Inversion for the Initial Distribution in the Multi-TermTime-FractionalDiffusion Equation Using Final Observations

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Advances in Applied Mathematics and Mechanics 2017年第6期9卷 1525-1546页

作者： Chunlong sun Gongsheng Li Xianzheng Jia School of Science Shandong University of TechnologyZiboShandong 255049China School of Mathematics Southeast UniversityNanjingJiangsu 210096China

This article deals with numerical inversion for the initial distribution in the multi-term time-fractional diffusion equation using final *** inversion problem is of instability,but it is uniquely solvable based on the solution’s expression for the forward problem and estimation to the multivariate Mittag-Leffler *** view point of optimality,solving the inversion problem is transformed to minimizing a cost functional,and existence of a minimum is proved by the weakly lower semi-continuity of the ***,the homotopy regularization algorithm is introduced based on the minimization problem to perform numerical inversions,and the inversion solutions with noisy data give good approximations to the exact initial distribution demonstrating the efficiency of the inversion algorithm.

关键词： Multi-term time-fractional diffusion multivariate Mittag-Leffler function backward problem ill-posedness numerical inversion

An efficient channel estimator for OFDM system with sparse multipath fading

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High Technology Letters 2009年第2期15卷 175-180页

作者：张晴川 Shu Feng sun Jintao Department of Communication Engineering Nanjing University of Science and Technology Nanjing 210094 P.R. China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 P.R. China

A channel estimator used in sparse muhipath fading channel for orthogonal frequency division multiplexing （OFDM） system is proposed. The dimension of signal subspace can be reduced to improve the performance of channel estimation. The simplified version of original subspace fitting algorithm is employed to derive the sparse multipaths. In order to overcome the difficulty of termination condition, we consider it as a model identification problem and the set of nonzero paths is found under the generalized Akaike information criterion （GAIC）. The computational complexity can be kept very low under proper training design. Our proposed method is superior to other related schemes due to combining the procedure of selecting the most probable taps with GAIC model selection. Simulation in hilly terrain （HT） channel shows that the proposed method has an outstanding performance.

关键词： channel estimation sparse muhipath fading OFDM GAIC

Whole-genome based Archaea phylogeny and taxonomy: A composition vector approach

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Chinese Science Bulletin 2010年第22期55卷 2323-2328页

作者： sun JianDong XU Zhao HAO BaiLin T-Life Research Center & Department of Physics Fudan University Shanghai 200433 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China Santa Fe Institute Santa Fe New Mexico 87501 USA

The newly proposed alignment-free and parameter-free composition vector (CVtree) method has been successfully applied to infer phylogenetic relationship of viruses, chloroplasts, bacteria, and fungi from their whole-genome data. In this study we pay special attention to the phylogenetic positions of 56 Archaea genomes among which 7 species have not been listed either in Bergey’s Manual of Systematic Bacteriology or in Taxonomic Outline of Bacteria and Archaea (TOBA). By inspecting the stable monophyletic branchings in CVTrees reconstructed from a total of 861 genomes (56 Archaea plus 797 Bacteria, using 8 Eukarya as outgroups) definite taxonomic assignments were proposed for these not-fully-classified species. Further development of Archaea taxonomy may verify the predicted phylogenetic results of the CVTree approach.

关键词：细菌分类学全基因组系统发育矢量方法组分古细菌亲缘关系真核生物

MPFS:A truly scalable router architecture for next generation Internet

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Science in China(Series F) 2008年第11期51卷 1761-1771页

作者： sun ZhiGang DAI Yi GONG ZhengHu Department of Computer Science National University of Defense Technology Changsha 410073 China

A new generation architecture of IP routers called massive parallel forwarding and switching （MPFS） is proposed, which is totally different from modern routers. The basic idea of MPFS is mapping complicated forwarding process into multilevel scalable switch fabric so as to implement packet forwarding in a pipelining and distributed way. This processing mechanism is named forwarding in switching （FIS）. By interconnecting multi-stage, lower speed components, called forwarding and switching nodes （FSN）, MPFS achieves better scalability in forwarding and switching performance just like MPP. We put emphasis upon IPv6 lookup problem in MPFS and propose a method for partitioning IPv6 FIB and mapping them to switch fabric. Simulation and computation results suggest that MPFS routers can support line-speed forwarding with a million of IPv6 prefixes at 40 Gbps. We also propose an implementation of 160 Tbps core router based on MPFS architecture at last.

关键词： IP routers forwarding and switching scalability architecture