检索结果-南通市图书馆

Weyl Spectrum of Upper Triangular Operator Matrices

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2020年第7期36卷 783-796页

作者： Xiu Feng WU Jun jie huang School of Mathematical Sciences Inner Mongolia Normal UniversityHohhot 010022P.R.China School of Mathematical Sciences Inner Mongolia UniversityHohhot 010021P.R.China

This paper is concerned with general n×n upper-triangular operator matrices with given diagonal *** characterizations of perturbations of their left(***)Weyl spectrum and Weyl spectrum are given,based on the space decomposition ***,some sufficient and necessary conditions are given under which the left(***)Weyl spectrum and the Weyl spectrum of such operator matrix,respectively,coincide with the union of the left(***)Weyl spectrum and the Weyl spectrum of its diagonal entries.

关键词： technique. diagonal spectrum

An overview on the distributed internal model approach and its applications

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2024年第3期22卷 345-359页

作者： Youfeng Su He Cai jie huang College of Computer and Data Science Fuzhou UniversityFuzhou 350116China School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinHong KongChina

The cooperative output regulation problem has been studied by two approaches:the distributed observer(DO)approach and the distributed internal model(DIM)approach,*** of these two approaches has its own merits and ***,we presented an overview on the cooperative output regulation problem by the DO *** paper further surveys the cooperative output regulation problem by the DIM *** first summarize the constructions and the roles of two different versions of the internal models:the distributed p-copy internal model and the distributed canonical internal ***,we describe an integrated framework that combines the DO approach and the DIM *** and variants of the DIM and their applications will also be highlighted.

关键词： Cooperative output regulation Distributed p-copy internal model Distributed canonical internal model Integrated approach

Structure and evolution of the submarine cable network of Chinese mainland

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2022年第5期32卷 932-956页

作者： XIE Yongshun WANG Chengjin huang jie Institute of Geographic Sciences and Natural Resources Research CASBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China

Submarine cable network is one of the most important connectivity infrastructures in the digital *** the past 20 years,the submarine cable network of Chinese mainland has formed a complex connectivity *** paper focuses on exploring the structure and evolution of the submarine cable network of Chinese *** results show that the evolution can be divided into four stages:an initial stage(1993-1998),a developmental stage(1999-2002),a stagnation stage(2003-2015)and an accelerated stage(2016-2018).The connectivity structure can be analyzed at micro,meso and macro ***,the connectivity increased significantly overall,but showed significant differences in *** the microscale,the landing cities were characterized by“extensive but low,exclusive and high”;for the mesoscale,the connectivity of countries or regions was characterized by“distance attenuation”as a whole,but,in part,by a“regional identity”;for the macroscale,intercontinental connectivity differences have been *** hierarchy has been upgraded from a“3 system”to a“2+3 system”.Finally,this paper discusses the interaction between submarine cable network construction and international relations,and puts forward policy suggestions for China’s submarine cable construction.

关键词： submarine cable network structure connectivity evolution Chinese mainland

Image restoration with shifting reflective boundary conditions

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第6期56卷 45-59页

作者： huang jie huang TingZhu ZHAO XiLe XU ZongBen School of Mathematical Sciences University of Electronic Science and Technology of China Institute of Information and System Sciences Xi'an Jiaotong University

In signal and image processing,we want to recover a faithful representation of an original scene from blurred,noisy image *** process can be transformed mathematically into solving a linear system with a blurring ***,the blurring matrix is determined from not only a point spread function(PSF),which defines how each pixel is blurred,but also boundary conditions(BCs),which specify our assumptions on the data outside the domain of *** this paper,we first propose shifting reflective BCs which preserve the continuity at the boundaries and,therefore,reduce ringing effects in the restored image.A Kronecker product approximation of the corresponding blurring matrix is then provided,regardless of symmetry requirement of the ***,we demonstrate the efficiency of our approximation in an SVD-based regularization method by several numerical examples.

关键词： Image restoration boundary conditions Kronecker product singular value decomposition

Editorial:special issue on frontiers of control and automation,dedicated to *** *** 60th birthday

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Control Theory and Technology 2023年第3期21卷 263-264页

作者： jie Chen jie huang Lihua Xie Department of Control Science and Engineering Tongji UniversityShanghaiChina Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina Center for Advanced Robotics Technology Innovation School of Electrical and Electronic EngineeringNanyang Technological UniversitySingaporeSingapore

It is our great pleasure and honor to organize this special issue"Frontiers of Control and Automation"in honor of the 60th birthday of our long-time colleague and friend Professor Ben *** Chen obtained his *** in mathemat-ics and computer science in 1983 from Xiamen University,China;*** in electrical engineering in 1988 from Gonzaga University,Spokane,Washington,USA;and *** in electrical and computer engineering in 1991 from Washington State University,Pullman,Washington,USA.

关键词： computer Xiamen frontier

Global robust stabilization of feedforward systems with uncertainties

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2010年第3期8卷 262-270页

作者： Tianshi CHEN jie huang Department of Electrical Engineering Link6ping University Link6ping Sweden Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong China

This paper studies the global robust stabilization problem for a class of feedforward systems that is subject to both dynamic and time-varying static uncertainties. A small gain theorem-based bottom-up recursive design is developed for constructing a nested saturation control law. At each recursion, two versions of small gain theorem with restrictions are employed to establish the global attractiveness and local stability of the closed-loop system at the equilibrium point, respectively.

关键词： Robust control Nonlinear systems Asymptotic stabilization

Output-based adaptive distributed observer for general linear leader systems over periodic switching digraphs

在线全文

学校读者我要写书评

暂无评论

Autonomous Intelligent Systems 2023年第1期3卷 123-130页

作者： Changran He jie huang Shenzhen Research Institute and Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong KongChina

In this paper,we present a sufficient condition for the exponential stability of a class of linear switched *** an application of this stability result,we establish an output-based adaptive distributed observer for a general linear leader system over a periodic jointly connected switching communication network,which extends the applicability of the output-based adaptive distributed observer from a marginally stable linear leader system to any linear leader system and from an undirected switching graph to a directed switching *** output-based adaptive distributed observer will be applied to solve the leader-following consensus problem for multiple double-integrator systems.

关键词： Distributed observer Multi-agent systems Stability Switched systems

A novel 3D frequency domain SAGE algorithm with applications to parameter estimation in mm Wave massive MIMO indoor channels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第8期60卷 58-69页

作者： Rui FENG jie huang Jian SUN Cheng-Xiang WANG Shandong Provincial Key Laboratory of Wireless Communication Technologies Shandong University State Key Laboratory of Millimeter Waves Southeast University Institute of Sensors Signals and Systems School of Engineering & Physical Sciences Heriot-Watt University

Millimeter wave(mm Wave) and massive multiple-input multiple-output(MIMO) wireless communication channels show some new characteristics different from conventional channels. In order to have an in-depth understanding of mm Wave massive MIMO channels, we conduct channel measurements at 16, 28, and 38 GHz frequency bands using virtual large horizontal planar arrays in an indoor office environment. First, a three dimensional(3D) frequency domain(FD) parameter estimation algorithm extended from the space alternating generalized expectation-maximization(SAGE) algorithm is proposed and used to process the measurement ***, by dividing the large array into several sub-arrays and calculating power delay profiles(PDPs), power azimuth angle profiles(PAAPs), and power elevation angle profiles(PEAPs), we analyze the changes of delay,azimuth angle of arrival(AAo A), and elevation Ao A(EAo A) over the large array. We find that the spatial cross-correlation functions(SCCFs) calculated along different directions of the planar array exhibit significant variations. Third, the comparison of the averaged PDPs(APDPs) at three different frequency bands shows that the attenuation increases when mm Wave channels move to high frequency bands. Furthermore, SCCFs of channels at three frequency bands are also compared for two uniform linear arrays(ULAs). We draw conclusion that the correlation coefficients can be affected by not only measurement environments, but also the relative angle between transmitter(Tx) pointing direction and receiver(Rx) large array, and the operating frequency bands.

关键词： millimeter wave bands massive MIMO 3D FD-SAGE algorithm planar array statistical properties

Thermoacoustic imaging:From single-element scanning to portable and array-based imaging

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2023年第3期21卷 1-20页

作者： Yi-jie huang Qi-Kai-Yu Feng Lin huang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China Zhangjiang Laboratory Shanghai201204China

The microwave-induced thermoacoustic imaging(TAI)technology has both the advantages of high contrast of microwave imaging and high resolution of ultrasound imaging(UI),so it has carried out exploratory application research in various areas,such as the early detection of breast tumors and cerebrovascular ***,the microwave generator used in the traditional TAI technology is huge and expensive,and the temporal resolution is also too low due to the single-element scanning ***,it is difficult to meet the needs of clinical *** this paper,the iterative process and the analysis of related application scenarios from single-element scanning to portable and array-based TAI,such as the miniaturized microwave generator,handheld antenna,multi-channel data acquisition,and UI/TAI􀀁dual-modality imaging,are reviewed,and the future trends of this technology are *** review helps researchers in the field of TAI learn the technological development process and future *** also deepens clinicians’understanding of TAI so as to put forward more application requirements.

关键词： Array-based Portable Single-element scanning Thermoacoustic imaging(TAI)