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Distributed Tracking Control of a Class of Multi-agent Systems in Non-affine Pure-feedback Form Under a Directed Topology

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IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 169-180页

作者： Yang Yang Dong Yue College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China Institute of Advanced Technology and Jiangsu Engineering Laboratory of Big Data Analysis and Control for Active Distribution Network Nanjing University of Posts and Telecommunications Nanjing 210023 China IEEE

In this paper, we consider a consensus tracking problem of a class of networked multi-agent systems(MASs)in non-affine pure-feedback form under a directed topology. A distributed adaptive tracking consensus control scheme is constructed recursively by the backstepping method, graph theory,neural networks(NNs) and the dynamic surface control(DSC)approach. The key advantage of the proposed control strategy is that, by the DSC technique, it avoids "explosion of complexity"problem along with the increase of the degree of individual agents and thus the computational burden of the scheme can be drastically reduced. Moreover, there is no requirement for prior knowledge about system parameters of individual agents and uncertain dynamics by employing NNs approximation *** then further show that, in theory, the designed control policy guarantees the consensus errors to be cooperatively semi-globally uniformly ultimately bounded(CSUUB). Finally, two examples are presented to validate the effectiveness of the proposed control strategy.

关键词： Backstepping consensus multi-agent systems(MASs) neural networks(NNs)

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中国城市住宅室内甲醛浓度及影响因素

化学进展 2022年第3期34卷 743-772页

作者：王琼肖康南京邮电大学材料科学与工程学院南京210023

本文汇集整理了文献报道的中国城市装修住宅室内甲醛浓度的数据,数据分布于2003—2018年之间,涵盖31省62市,总10394套装修房屋和27384个房间。文中从全国分布状况、逐年变化趋势、室内温湿度影响、季节变化规律、房间类型区别和装修后... 详细信息

本文汇集整理了文献报道的中国城市装修住宅室内甲醛浓度的数据,数据分布于2003—2018年之间,涵盖31省62市,总10394套装修房屋和27384个房间。文中从全国分布状况、逐年变化趋势、室内温湿度影响、季节变化规律、房间类型区别和装修后晾置时间几个不同方面分析了室内甲醛污染现状和影响室内甲醛浓度的主要因素。结果显示,全国室内甲醛污染十分严重,浓度显著高于国标GB/T 18883-2002规定的标准,且超标率大都在50%以上。虽然自国标GB/T 18883-2002颁布以后,室内甲醛浓度在2003—2009年间逐年下降,但2013年之后又呈现上升趋势,需要引起警惕。整体而言,室内温度越高、装修量越大、装修材料越易释放甲醛、装修后晾置时间越短、房间通风越少,甲醛浓度越高。南方和北方室内甲醛浓度季节变化规律不同,但无论南方还是北方,室温越高、通风换气越少的季节,甲醛浓度越高。

关键词：室内空气质量(IAQ) 室内甲醛影响因素室内温度室内装修通风换气

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极地灾害区域监测的目标搜索规划与算法

系统仿真学报 2023年第7期35卷 1526-1538页

作者：丁飞张美楠庄衡衡马海蓉张登银南京邮电大学物联网学院江苏南京210003 南京邮电大学江苏省宽带无线通信和物联网重点实验室江苏南京210003 南京邮电大学通信与网络技术国家工程研究中心江苏南京210003

为提高极地水域船舶安全航行路线规划与碰撞预警能力,提出了监测中心基于聚类和树形索引的目标搜索优化方法。以船舶当前航行区域构建灾害监测场景,引入虚拟电子围栏对监测区域进行定义;通过谱聚类算法对围栏区域进行风险等级划分,提取... 详细信息

为提高极地水域船舶安全航行路线规划与碰撞预警能力,提出了监测中心基于聚类和树形索引的目标搜索优化方法。以船舶当前航行区域构建灾害监测场景,引入虚拟电子围栏对监测区域进行定义;通过谱聚类算法对围栏区域进行风险等级划分,提取出高风险区域,实现目标搜索场景生成的优化;融合R-tree索引的射线算法对目标船只与围栏区域匹配关系的高效判定,从而实现目标搜索计算的优化。利用科考船舶的航行数据进行场景设定,通过仿真实验对目标搜索优化方法进行性能评估,结果表明,所提目标搜索算法性能优于传统方法,场景生成计算复杂度降低约50%,目标搜索计算效率提升约40%。

关键词：极地预警谱聚类 R-tree索引射线算法

Energy Model for UAV Communications:Experimental Validation and Model Generalization

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China Communications 2021年第7期18卷 253-264页

作者： Ning Gao Yong Zeng Jian Wang Di Wu Chaoyue Zhang Qingheng Song Jachen Qian Shi Jin National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China College of Electrical and Information Engineeing Huaihua UniversityHuaihua 418008China Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua 418008China

Wireless communication involving unmanned aerial vehicles(UAVs)is expected to play an important role in future wireless ***,different from conventional terrestrial communication systems,UAVs typically have rather limited onboard energy on one hand,and require additional flying energy consumption on the other *** renders energy-efficient UAV communication with smart energy expenditure of paramount *** this paper,via extensive flight experiments,we aim to firstly validate the recently derived theoretical energy model for rotary-wing UAVs,and then develop a general model for those complicated flight scenarios where rigorous theoretical model derivation is quite challenging,if not ***,we first investigate how UAV power consumption varies with its flying speed for the simplest straight-and-level *** about 12,000 valid power-speed data points collected,we first apply the model-based curve fitting to obtain the modelling parameters based on the theoretical closed-form energy model in the existing *** addition,in order to exclude the potential bias caused by the theoretical energy model,the obtained measurement data is also trained using a model-free deep neural *** is found that the obtained curve from both methods can match quite well with the theoretical energy ***,we further extend the study to arbitrary 2-dimensional(2-D)flight,where,to our best knowledge,no rigorous theoretical derivation is available for the closed-form energy model as a function of its flying speed,direction,and *** fill the gap,we first propose a heuristic energy model for these more complicated cases,and then provide experimental validation based on the measurement results for circular level flight.

关键词： UAV communications energy model energy consumption flight experiments model generalization

First-principles study of structural and opto-electronic characteristics of ultra-thin amorphous carbon films

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Chinese Physics B 2022年第1期31卷 434-444页

作者： Xiao-Yan Liu Lei Wang Yi Tong College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China

Most amorphous carbon(a-C)applications require films with ultra-thin thicknesses;however,the electronic structure and opto-electronic characteristics of such films remain unclear so *** address this issue,we developed a theoretical model based on the density functional theory and molecular dynamic simulations,in order to calculate the electronic structure and opto-electronic characteristics of the ultra-thin a-C films at different densities and *** was found to have a weak influence over the resulting electronic structure and opto-electronic characteristics,whereas density had a significant influence on these *** volume fraction of sp3 bonding increased with density,whereas that of sp2 bonding initially increased,reached a peak value of 2.52 g/cm^(3),and then decreased ***,the extinction coefficients of the ultra-thin a-C films were found to be density-sensitive in the long-wavelength *** implies that switching the volume ratio of sp2 to sp3 bonding can effectively alter the transmittances of ultra-thin a-C films,and this can serve as a novel approach toward photonic memory ***,the electrical resistivity of the ultra-thin a-C films appeared independent of *** implicitly indicates that the electrical switching behavior of a-C films previously utilized for non-volatile storage applications is likely due to an electrically induced effect and not a purely thermal consequence.

关键词： amorphous carbon density optical properties electronic structure density functional theory

Self-assembly into Polymorphic 2D Nanosheets with Crystallization-Induced Emission Enhancement

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Chinese Journal of Chemistry 2022年第7期40卷 832-837页

作者： He Zhang Dong Jin Dongqing Lin Lei Huang Jin Wang Shasha Wang Linghai Xie Centre for Molecular Systems and Organic Devices(CMSOD) Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&TelecommunicationsNanjingJiangsu 210023China

Organic micro/nanocrystals with polymorphic tailorability and perfect platform to modulate decode the complex relationship among molecular structures,supramolecular/noncovalent interactions,aggregates and exciton ***,we precisely tune the polymorphic two-dimensional organic nanosheets(2DONs)of cyano-spirocyclic aromatic hydrocarbon(2'-CN-SFX),where the crystal growth processes are dominated by precursor *** low concentration(ca.2 mmol/L)affords the rhombus-like nanosheets with monoclinic P21/c space group,in which molecules adopt antiparallel and slipped stacking *** contrast,the high concentration(ca.4 mmol/L)favors herringbone-like molecular packing pattern and then generates shuttle-like nanosheets with monoclinic C2/c space *** above polymorphic nanosheets exhibit unprecedented crystallization-induced emission en-hancement(CIEE)feature that increases the photoluminescence quantum yields(PLQYs)from 16%in solution,21%in amorphous film to 37%-39%in crystalline *** result will offer promising opportunities for nanophotonics and organic intelligent semi-conductors.

关键词： Polymorphism Self-assembly 2D nanostructures Steric design Crystallization-induced emission enhancement Supramolecular chemistry

Near-Infrared-Excitable Organic Ultralong Phosphorescence through Multiphoton Absorption

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Research 2020年第1期2020卷 474-485页

作者： Ye Tao Lele Tang Qi Wei Jibiao Jin Wenbo Hu Runfeng Chen Qingqing Yang Huanhuan Li Ping Li Guichuan Xing Quli Fan Chao Zheng Wei Huang Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts&Telecommunications9 Wenyuan RoadNanjing 210023China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Shaanxi Key Laboratory of Flexible ElectronicsXi’an Key Laboratory of Flexible ElectronicsXi’an Key Laboratory of Biomedical Materials&EngineeringXi’an Institute of Flexible ElectronicsInstitute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi’an710072 ShaanxiChina

Organic ultralong room-temperature phosphorescence(OURTP)with a long-lived triplet excited state up to several seconds has triggered widespread research interests,but most OURTP materials are excited by only ultraviolet(UV)or blue light owing to their unique stabilized triplet-and solid-state emission ***,we demonstrate that near-infrared-(NIR-)excitable OURTP molecules can be rationally designed by implanting intra/intermolecular charge transfer(CT)characteristics into Haggregation to stimulate the efficient nonlinear multiphoton absorption(MPA).The resultant upconverted MPA-OURTP show ultralong lifetimes over 0.42 s and a phosphorescence quantum yield of~37%under both UV and NIR light *** by the extraordinary MPA-OURTP,novel applications including two-photon bioimaging,visual laser power detection and excitation,and lifetime multiplexing encryption devices were successfully *** discoveries illustrate not only a delicate design map for the construction of NIR-excitable OURTP materials but also insightful guidance for exploring OURTP-based nonlinear optoelectronic properties and applications.

关键词： excited photon Infrared

Self-filtering illumination source and application in fluorescence imaging

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Chinese Optics Letters 2023年第1期21卷 49-53页

作者：秦飞飞石帆高绪敏严嘉彬叶子琪苏宇龙富建威王永进 Grünberg Research Centre College of Telecommunications and Information EngineeringNanjing University of Posts and TelecommunicationsNanjing 210003China

To date,fluorescence imaging systems have all relied on at least one beam splitter(BS)to ensure the separation of excitation light and ***,we reported SiO2=TiO2 multi-layer long pass filter integrated GaN *** is considered as the potential source for imaging *** results indicate that the GaN LED shows blue emission peaked at 470.3 nm and can be used to excite dye *** with a long pass filter(550 nm),the light source can be used to establish a real-time fluorescence detection for dyes that emit light above 550 *** interestingly,with this source,a real-time imaging system with signature words written with the dyes,such as‘NJUPT’,can be converted into CCD *** work may lead to a new strategy for integrating light sources and BS mirrors to build mini and smart fluorescence imaging systems.

关键词： GaN LED self-filtering illumination source fluorescence imaging

A DHR executor selection algorithm based on historical credibility and dissimilarity clustering

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Science China(Information Sciences) 2023年第11期66卷 288-301页

作者： Sisi SHAO Yimu JI Weili ZHANG Shangdong LIU Fei JIANG Zhigang CAO Fei WU Fukang ZENG Jun ZUO Longfei ZHOU School of Computer Science Nanjing University of Posts and Telecommunications Institue of High Performance Computing and Bigdata Nanjing University of Posts and Telecommunications Purple Mountain Laboratories Nanjing Center of HPC China Jiangsu HPC and Intelligent Processing Engineer Research Center School of Foreign Languages Information Engineering University The 28th Research Institute of China Electronics Technology Group Corporation

The security of the dynamic heterogeneous redundancy(DHR) architecture relies on the heterogeneity of its executors, which also defines the vulnerability of the mimic system. In order to select executors with reliable and significant dissimilarity as service executors, we propose a DHR executor selection algorithm based on historical credibility and dissimilarity clustering(HCDC), which adds two metrics of executor historical credibility and dissimilarity. First, to maximize the difference between heterogeneous executor pools,clustering is performed based on the dissimilarity of the executor. Second, the executor with the highest historical credibility is selected from the heterogeneous executor pool as the candidate pool. The historical credibility is dynamically updated by the negative feedback control based on the results of the multi-mode adjudicator. Finally, the dynamic scheduling algorithm selects the executors from the candidate pool to form the set of service executors. The simulation results demonstrate that, in comparison to existing methods,the algorithm reduces the attack success rate and average failure rate while increasing system reliability.

关键词： endogenous security mimic defense DHR executor selection historical credibility