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Multistage Synchronous Secure Communication Method

Journal of Physics: Conference Series 2018年第3期1087卷

作者： Wei Sun Jun He Lei Quan Science and Technology on Complex Electronic System Simulation Labratory University of Aerospace Engineering Beijing 101416 China Naval Academy of Armament Beijing 100161 China Based on Time-delayed Hyperchaotic System

To solve the security of data transmission in network, a secure communication method based on time-delayed hyperchaotic synchronization is presented. By selecting the typical hyperchaotic system, the communication system synchronization scheme is designed to realize the recovery of the encrypted signal, and the security performance of the method is analyzed by simulation. The simulation results show that the synchronization method has the characteristics of high security and is easy to implement.

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Smooth controller design for non-linear systems using multiple fixed models

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IET Control Theory & Applications 2017年第9期11卷 1467-1473页

作者： Jie Chen Wei Chen Jian Sun The Key Laboratory of Intelligent Control and Decision of Complex System School of Automation Beijing Institute of Technology Beijing People's Republic of China Science and Technology on Electronic Information Control Laboratory Chengdu People's Republic of China

Multiple model adaptive control (MMAC) with second-level adaptation is a recently proposed methodology for dealing with systems where the parametric uncertainty is large. Compared with the multiple model switching scheme, the new scheme can lead to significant improvements in performance. Some research has been conducted using the new scheme, but all of the results concern linear systems with an adaptive identification model set. In this study, MMAC with second-level adaptation scheme is extended to non-linear systems in strict feedback form, and the fixed identification model set is under consideration. This is motivated by the fact that a smooth controller can lead to smooth performance and the fixed identification model set gains potential advantages over the adaptive identification model set, especially for the case that the parameters of the system change over the time. Design details are presented and the stability of MMAC with second-level adaptation using a fixed identification model set for non-linear systems is given, which has not been discussed before. Finally, two simulations are performed to show that this scheme performs much better than conventional schemes, including adaptive control and multiple-model switching schemes, in terms of convergence speed and transient performance.

关键词： nonlinear control systems control system synthesis adaptive control uncertain systems linear systems identification convergence transient performance convergence speed fixed identification model set second-level adaptation scheme adaptive identification model set linear systems multiple model switching scheme parametric uncertainty MMAC multiple model adaptive control multiple fixed models nonlinear systems smooth controller design

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Research on knowledge network modelling for aero-craft system design 7

Research on knowledge network modelling for aero-craft syste...

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7th International Conference on simulation and Modeling Methodologies, Technologies and Applications, SIMULTECH 2017

作者： Zhai, Xiang Dai, Feng Qu, Huiyang Zhong, Lingling Du, Chenyong Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China School of Mechanical Engineering Zhejiang University Hangzhou China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing China Aviation Engineering Institute Civil Aviation Flight University of China Sichuan China Beijing ZhiYuanChuangTong IT Co Ltd Beijing China

ISBN: (纸本)9789897582653

A great amount of existing knowledge is required during the development of aero-craft system. At present, the existing knowledge organization model construct different knowledge model for different stages is difficult to adapt to the complicated product life cycle application. This study proposes a product development oriented knowledge network model focusing on expressing the knowledge demands and connecting the computer-aided system. Under the overall knowledge network model, this study describes the ontology description method of spacecraft product model, development tasks and aerospace terminology. Recommending missile aerodynamic knowledge within the design stage is presented as a case study, and the framework and the method is proved to be effective. © Copyright 2017 by SCITEPRESS - science and technology Publications, Lda. All rights reserved.

关键词： Ontology

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Geoacoustic inversion using ship noise vector field

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Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University 2018年第2期39卷 236-240页

作者： Ren, Qunyan Piao, Shengchun Ma, Li Guo, Shengming Liao, Tianjun Institute of Acoustics Chinese Academy of Sciences Beijing100190 China Key Laboratory of Underwater Acoustics Environment Chinese Academy of Sciences Beijing100190 China Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University Harbin150001 China State Key Laboratory of Complex System Simulation Beijing100101 China

Seabed geoacoustic parameters and associated uncertainties are important for sonar performance prediction and related applications, and the feasibility of jointly using pressure and vector fields to increase geoacoustic inversion reliability is discussed. The matching field inversion algorithm is used to process ship noise data collected by a single-vector hydrophone, and the estimation value and posterior probability distribution is derived. Theoretical analysis and a numerical simulation suggest that the component of the vertical particle velocity provides more abundant acoustic signal transmission characteristics than when using the acoustic pressure field only, and more consolidated estimates can be obtained through using pressure and vector fields jointly than by treating them individually. © 2018, Editorial Department of Journal of HEU. All right reserved.

关键词： Uncertainty analysis

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Analysis of deceptive moving target generated by single jammer in multi-channel SAR-GMTI

Analysis of deceptive moving target generated by single jamm...

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International Applied Computational Electromagnetics Society Symposium in China

作者： Jingke Zhang Dahai Dai Zongfeng Qi Yonghu Zeng Shunping Xiao State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Engineering National University of Defense Technology

ISBN: (纸本)9781509043118

Based on three-channel SAR-GMTI system, the velocity and location of the deceptive moving target generated by single jammer are studied. Study result shows that both the deceptive stationary target and moving target can be considered as moving target, and the estimated azimuth location which has nothing to do with the setting value is the same as jammer.

关键词： Jamming Azimuth Synthetic aperture radar Radar imaging Antennas Imaging

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3D-Parallel Coordinates:Visualization for Time Varying Multidimensional Data

3D-Parallel Coordinates:Visualization for Time Varying Multi...

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2016 IEEE 7th International Conference on Software Engineering and Service science

作者： Yao Zhonghua Wu Lingda Science and Technology on Complex Electronic System Simulation Laboratory Equipment Academy

Parallel coordinates can visualize multidimensional data efficiently,during to its shortage in displaying time-varying data,we present a new method to add time dimension,which can extend parallel coordinates into 3D space(3D-Parallel Coordinates)consisted of attribute,range and time *** that timevarying multidimensional data can be displayed as polygonal line cluster for recording and analyzing.A technique called clipping shade is taken to highlight datasets around the current time,and results reveal that 3D-Parallel Coordinates can effectively analyze attribute's time-varying character.

关键词： parallel coordinates time-varying multidimensional data data visualization

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A Hierarchical Access Control Model of Software Repository Based on RBAC

A Hierarchical Access Control Model of Software Repository B...

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2016 IEEE 7th International Conference on Software Engineering and Service science

作者： Cen Pengrui Wu LingDa Yang Chao Yu Ronghuan Science and Technology on Complex Electronic System Simulation Laboratory Academy of Equipment

Analized the task and general form of the software management;pionted out the shortages of the software repository on *** introduced the Role-Based Access Control model(RBAC model) which was introduced into the construction of software repository service by combining with the requirement of security management about software repository.A hierarchical access control model based on RBAC was proposed,and it database of the software repository based on RBAC was *** effective application of this model in the process of software management can ensure the convenience of software distribution;and meanwhile it can effectively improve the security of the software packages.

关键词： software management access control model security

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Network Boundary and Protection

Network Boundary and Protection

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Haitao Yang Jian Zhang Science and Technology on Complex Electronic System Simulation Laboratory Department of Graduate Management Equipment Academy Beijing China

ISBN: (纸本)9781509051557

The exposure of PRISM reminds us of network sovereignty. There are two problems about network sovereignty-network boundary partition and protection. These two problems are discussed in this paper. A method of multidimensional network boundary partition is proposed based on comprehensive analysis of existing schemes. And network boundary protection is studied based on standard rules of cyber warfare. Characteristic of network boundary protection technique is analyzed and methods are proposed about how to construct network boundary protection.

关键词： Law Switches Security Logic gates Servers Internet Ports (Computers)

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Energy efficiency analysis of heterogeneous platforms: Early experiences 7

Energy efficiency analysis of heterogeneous platforms: Early...

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7th International Green and Sustainable Computing Conference, IGSC 2016

作者： Li, Youhuizi Shi, Weisong Jiang, Congfeng Zhang, Jilin Wan, Jian Key Laboratory of Complex Systems Modeling and Simulation Hangzhou Dianzi University China Mobile and Internet Systems Laboratory Wayne State University United States School of Information and Electronic Engineering Zhejiang University of Science and Technology China

ISBN: (纸本)9781509051175

Heterogeneous multi-core platforms, e.g., ARM's ***, are a promising trend to improve the performance and energy efficiency of future mobile systems. However, the immediate benefits and the challenges to take advantage of the heterogeneity are still not clear. In this paper, we present our early experiences about the energy efficiency of the two *** heterogeneous platforms: ODROID XU+E and ODROID XU3. We quantified compared them with homogeneous platforms through multiple benchmarks which include popular mobile applications and high-performance parallel benchmarks. Besides, we analyzed the scheduling impact on the energy consumption of the heterogeneous platforms and the migration cost is also discussed. Based on the results, several insights, such as fine-granularity power control and thread level parallelism, related to hardware, application and system design are derived. © 2016 IEEE.

关键词： Energy utilization

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A novel 3-D imaging algorithm for downward-looking MIMO Array SAR 11

A novel 3-D imaging algorithm for downward-looking MIMO Arra...

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11th European Conference on Synthetic Aperture Radar, EUSAR 2016

作者： Liao, Bin Dai, Dahai Xing, Shiqi Pang, Bo Wang, Xuesong School of Electronic Science and Engineering National University of Defense Technology Changsha410073 China State Key Laboratory of Complex Electromagnetics Effects on Eletctronics and Information System National University of Defense Technology Changsha410073 China

Downward-looking MIMO array 3-D synthetic aperture radar is a hot research recently, it overcomes the layover and can acquire more information with the affordable antenna elements. The multiple transmitters and receivers provide a larger degree of freedom, which could be uesd to reduce the pulse repeat frequency, extend the wide-swath or suppress the interferers and so on. However, there are little literates considering the polarization in this new radar system, this paper introduce the polarization in and proposed a Tikhonov regularization algorithm to reconstruct the 3-D images. The simulation results show the proposed algorithm is excel to FFT method with the SNR increase. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Synthetic aperture radar

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