检索结果-南通市图书馆

Chinese Physics B 2019年第1期28卷 313-322页

作者： Muyun Fang Cancan Zhou Xin Huang Xiao Li Jianping Zhou School of Computer Science and Technology Anhui University of Technology School of Computer Science and Technology Huaibei Normal University

The paper addresses the issue of H_∞ couple-group consensus for a class of discrete-time stochastic multi-agent systems via output-feedback control. Both fixed and Markovian switching communication topologies are considered. By employing linear transformations, the closed-loop systems are converted into reduced-order systems and the H_∞ couplegroup consensus issue under consideration is changed into a stochastic H_∞ control problem. New conditions for the mean-square asymptotic stability and H_∞ performance of the reduced-order systems are proposed. On the basis of these conditions, constructive approaches for the design of the output-feedback control protocols are developed for the fixed communication topology and the Markovian switching communication topologies, respectively. Finally, two numerical examples are given to illustrate the applicability of the present design approaches.

关键词： multi-agent system couple-group consensus output feedback control switching topologies

Identifying topologies and system parameters of uncertaintime-varying delayed complex networks

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第1期62卷 94-105页

作者： WANG Xiong GU HaiBo WANG QianYao Lü JinHu LSC Academy of Mathematics and Systems Science Chinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences School of Automation Science and Electrical Engineering State Key Laboratory of Software Development Environment and Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University

Node dynamics and network topologies play vital roles in determining the network features and network dynamical *** it is of great theoretical significance and practical value to recover the topology structures and system parameters of uncertain complex networks with available information. This paper presents an adaptive anticipatory synchronization-based approach to identify the unknown system parameters and network topological structures of uncertain time-varying delayed complex networks in the presence of noise. Moreover, during the identification process, our proposed scheme guarantees anticipatory synchronization between the uncertain drive and constructed auxiliary response network simultaneously. Particularly, our method can be extended to several special cases. Furthermore, numerical simulations are provided to verify the effectiveness and applicability of our method for reconstructing network topologies and node parameters. We hope our method can provide basic insight into future research on addressing reconstruction issues of uncertain realistic and large-scale complex networks.

关键词： system parameters and network topologies identification anticipatory synchronization uncertain time-varying delayed complex networks noise-perturbed complex networks

Controllably Growing topologies in One-shot RAFT Polymerization via Macro-latent Monomer Strategy

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第1期39卷 60-69,I0006页

作者： Liu-Qiao Zhang Yang Gao Zhi-Hao Huang Wei Zhang Nian-Chen Zhou Zheng-Biao Zhang Xiu-Lin Zhu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Global Institute of Software Technology Suzhou 215163China

The controlled and efficient synthesis of polymers with tailored topologies is challenging but important for exploring structure/property research. Herein, we proposed a concept of macro-latent monomer to achieve the controlled growth of polymer *** macro-latent monomer was installed by a dynamic furan/maleimide covalent bond at the chain terminal. One-shot reversible additionfragmentation chain transfer(RAFT) polymerization of styrene and the macro-latent monomer created controlled growth of polymer *** temperature such as 40 ℃ could not activate the macro-latent monomer and thus the polymerization created the homo-polystyrene. By contrast, high temperature of ~110 ℃ activated the macro-latent monomer, and a maleimide-terminated macro-monomer was released via the retro-Diels Alder reaction. This macro-monomer immediately joined the cross polymerization with styrene and thus produced the side chains. By delicately manipulating the polymerization temperature, the predetermined placement of the macro-latent monomer-derived polymeric sidechains created controllably growing topologies, including star-, π-shaped, and density-variable grafting copolymers. This work paved a new way for creating on-demand topologies and would greatly enrich the topology synthesis.

关键词： Latent monomer Diels-Alder reaction Maleimide Styrene topologies

Hybrid-triggered consensus for multi-agent systems with time-delays,uncertain switching topologies, and stochastic cyber-attacks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第9期28卷 131-144页

作者： Xia Chen Li-Yuan Yin Yong-Tai Liu Hao Liu School of Automation Shenyang Aerospace University

We propose a new approach to discuss the consensus problem of multi-agent systems with time-varying delayed control inputs, switching topologies, and stochastic cyber-attacks under hybrid-triggered mechanism.A Bernoulli variable is used to describe the hybrid-triggered scheme, which is introduced to alleviate the burden of the *** mathematical model of the closed-loop control system is established by taking the influences of time-varying delayed control inputs,switching topologies, and stochastic cyber-attacks into account under the hybrid-triggered scheme.A theorem as the main result is given to make the system consistent based on the theory of Lyapunov stability and linear matrix *** jumps with uncertain rates of transitions are applied to describe the switch of ***, a simulation example demonstrates the feasibility of the theory in this paper.

关键词： hybrid-triggered consensus multi-agent system time-delay and cyber-attacks switching topologies

The Impact of Network topologies and Radio Duty Cycle Mechanisms on the RPL Routing Protocol Power Consumption

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第5期79卷 1835-1854页

作者： Amal Hkiri Hamzah Faraj Omar Ben Bahri Mouna Karmani Sami Alqurashi Mohsen Machhout Physic Department Electronics and Micro-Electronics LaboratoryFaculty of Sciences of MonastirMonastir5000Tunisia Department of Science and Technology College of RanyahTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

The Internet of Things(IoT)has witnessed a significant surge in adoption,particularly through the utilization of Wireless Sensor Networks(WSNs),which comprise small internet-connected *** deployments span various environments and offer a multitude of ***,the widespread use of battery-powered devices introduces challenges due to their limited hardware resources and communication *** response to this,the Internet Engineering Task Force(IETF)has developed the IPv6 Routing Protocol for Low-power and Lossy Networks(RPL)to address the unique requirements of such *** the critical role of RPL in maintaining high performance,this paper proposes a novel approach to optimizing power ***,it introduces a developed sensor motes topology integrated with a Radio Duty Cycling(RDC)mechanism aimed at minimizing power *** rigorous analysis,the paper evaluates the power efficiency of this approach through several simulations conducted across different network topologies,including random,linear,tree,and elliptical ***,three distinct RDC mechanisms—CXMAC,ContikiMAC,and NullRDC—are investigated to assess their impact on power *** findings of the study,based on a comprehensive and deep analysis of the simulated results,highlight the efficiency of ContikiMAC in power *** research contributes valuable insights into enhancing the energy efficiency of RPL-based IoT networks,ultimately facilitating their widespread deployment and usability in diverse environments.

关键词： WSN IoT radio duty cycles topologies

Derivation of Multilevel Voltage Source Converter topologies for Medium Voltage Drives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2017年第2期3卷 24-31页

作者： Yunwei Li Zhongyi Quan Department of Electrical and Computer Engineering University of AlbertaEdmontonT6G 1H9Canada

Multilevel voltage source converters(MLVSCs)have been widely applied in the medium voltage drive(MVD)*** performance of a MVD system is strongly dependent on the utilized *** of today,many interesting topologies have been proposed and evaluated in *** addition to proposing new topologies,another important research topic is the MLVSC topology *** this paper,two topology derivation principles,*** conformation principle and vertical conformation principle,are proposed from the standpoint of *** both principles,a MLVSC topology can be considered as a certain combination of one base switching cell and several module switching *** the proposed principle,the derived topology will naturally have modularity,which is favorable in practical *** addition,voltage level extension based on cascaded H-bridge building blocks(HBBBs)is also *** challenging issues faced by the emerging topologies for MVD applications are also *** is hoped that this paper can provide a new perspective on the MLVSC topology derivation and inspire new topologies in the future.

关键词： Multilevel converters voltage source converters topologies medium voltage drives

Study of New Planar Resonator’s topologies Little Perceptible in Variations of Substratum’s Height

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Circuits and Systems 2012年第3期3卷 223-229页

作者： Nizar Zrigui Lahbib Zenkouar Seddik Bri Department of Electrical Engineering Graduate School of Technology Moulay Ismail university Meknes Morocco Laboratory of Electronics and Communication (LEC) Ecole Mohammadia d’Ingénieurs (EMI) Mohammed V university - Agdal Rabat Morocco

The mobile communication (radio, mobile, satellite telephony…) insert band filters which are required to comply with stringent pass-band characteristics concerning the selectivity, the group delay, the insertion losses and the mass and volume. The mass and volume of payload electronic equipment is a significant contributor to the overall cost of space systems. Within this framework, many improvements were made in the design of filters and multiplexers which represent a considerable portion of the overall satellite payload. The High Temperature Superconducting (HTS) planar technology permits to realize compact size filtering devices. Moreover, it could also provide a superior performance not attainable by any other technology. However, not controllable parameters in the manufacturing processes (indistinctness of the engraving, the not uniformity of substratum thickness) do not allow to obtain a precision on the echo’s frequency and to keep a high quality factor. So, it is necessary to use method to tune the center frequency of filters after the fabrication or to study new resonator topologies which present lower sensitivity to LAIO3 substrate thickness. This last point is the object of this article.

关键词： Resonator Planar Technology topologies Echo’s Frequency Substratum’s Height Quality Factor

Recent Development of Linear Machine topologies and Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2018年第1期2卷 65-72页

作者： Q.F.Lu W.H.Mei Zhejiang University China

Linear machines(LMs)produce linear motion without any intermediate transmission mechanisms,thus the whole electromechanical system has simple structure and its efficiency is *** of such merits,linear machines have been studied for a long time and rapidly developed in recent *** to the characteristic of open structure,linear machines have more diversity than rotary machines in terms of machine *** for the wide applications of linear machines,*** train,precision machine tools,semiconductor processing device,automatic equipment,logistic transport line,ropeless lifter,compressor,etc.,this paper reviews the most applied linear machines including machine topologies,operating principle and *** addition,the influence of end effects and the corresponding reduction methods are also ***,several commercial applications are exemplified.

关键词： Application linear induction machine linear machine linear synchronous machine topologies

Design principles in MOF-derived electromagnetic wave absorption materials:Review and perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 405-427页

作者： Zhenguo Gao Kai Yang Zehao Zhao Di Lan Qian Zhou Jiaoqiang Zhang Hongjing Wu School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072China MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072China College of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China

At present,metal-organic framework(MOF)-derived nano-micro architectures are actively explored for electromagnetic(EM)wave absorption owing to their flexible composition and structural manipulation that enhance dielectric and magnetic ***,the basic design principles in MOF-derived microwave absorption materials have not been *** review is devoted to analyzing design principles in MOF-derived microwave absorption materials from the following perspectives:diverse monomers(ligands and ions of MOFs),topologies,chemical states,and physical *** derived essential information regarding the EM wave absorption mechanism and the structural-functional dependency is also comprehensively ***,a clear insight into the challenges and perspectives of the industrial revolution upgrading in this promising field is proposed.

关键词： metal-organic frameworks topologies chemical states physical properties electromagnetic wave absorption

Three-dimensional finite-time cooperative guidance for multiple missiles without radial velocity measurements

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2019年第5期32卷 1294-1304页

作者： Teng LYU Chuanjiang LI Yanning GUO Guangfu MA Department of Control Science and Engineering Harbin Institute of Technology

In order to simultaneously attack a target with impact angle constraint in threedimensional(3-D) space, a novel distributed cooperative guidance law for multiple missiles under directed communication topologies is proposed without radial velocity measurements. First, based on missiles-target 3-D relative motion equations, the multiple missiles cooperative guidance model with impact angle constraint is constructed. Then, in Line-of-Sight(LOS) direction, based on multiagent system cooperative control theory, one guidance law with directed topologies is designed with strict proof, which can guarantee finite time consensus of multiple missiles' impact times. Next, in elevation direction and azimuth direction of LOS, based on homogeneous system stability theory and integral sliding mode control theory, two guidance laws are proposed respectively with strict proof, which can guarantee LOS angles converge to desired values and LOS angular rates converge to zero in finite time. Finally, the effectiveness of the designed cooperative guidance law is demonstrated through simulation results.

关键词： 3-D cooperative guidance Directed communication topologies Finite time Impact angle constraint Radial velocity measurements