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Study on the Properties of Terahertz-Wave Propagation in complex Atmosphere

Study on the Properties of Terahertz-Wave Propagation in Com...

The 7th UK/Europe-China Workshop on Millimeter Waves and Terahertz Technologies(第7届英国/欧洲-中国毫米波与太赫兹技术研讨会)

作者： Xiaofan Yang Guoyu Wang Liandong Wang Xianqi Lin Bo Zhang State Key Laboratory of Complex Electromagnetic Environment Effects on Electronic and Information System Luoyang Electronic Equipment Test Center of China Luoyang471003China EHF Key Laboratory of Fundamental Science University of Electronic Science and Technology of ChinaChengdu611731China

Changing weather condition,region height and meteorological parameters of atmosphere determines the feasibility of proposed research,technical and commercial applications of THz electromagnetic wave *** to International Telecommunication Union Radio communication Sector(ITU-R)recommendation P.676-9,the paper programmed,simulated and calculated THz band atmospheric gases attenuation under different water-vapour density(0,5,7.5,15g/m3),temperature(-20,15.40℃),barometric pressure(80,101.3,110kPa),***,based on the solid electronics THz band T/R modules,series 330GHz wave propagation attenuation experiment are carried out under certain atmosphere *** experimental results of IF power show good agreement with the calculation results,the power discrepancy less than 1.5dB.

关键词： Terahertz Electromagnetic wave propagation Absorption Atmospheric gases attenuation

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Distributed differential evolution algorithm with adaptive parameters

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Kongzhi yu Juece/Control and Decision 2014年第4期29卷 701-706页

作者： Zhang, Chun-Mei Chen, Jie Xin, Bin School of Automation Ministry of Education Beijing Institute of Technology Beijing 100081 China Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing Institute of Technology Beijing 100081 China School of Electronic Information Engineering Taiyuan University of Science and Technology Taiyuan 030024 China

An adaptive distributed differential evolution algorithm is proposed based on the change of the individual's fitness value. Firstly, the initial population is divided into several subpopulations. When the migration condition is satisfied, the best individual in each subpopulation will replace the worst individual of its neighbor subpopulations according to the Von Neumann topology. The migration mechanism among subpopulations enables the information to be communicated in the whole population. Meanwhile, the adaptive mechanism of F and CR is presented for assigning different F and CR to each individual according to the individual's fitness. Numerical results show that, the proposed algorithm is beneficial to explore the solution space, which can avoid the premature convergence and search the excellent solutions.

关键词： Optimization

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The freeform collimating lens designed for light transmission

The freeform collimating lens designed for light transmissio...

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International Conference on Advanced Robotics and Intelligent systems (ARIS)

作者： A. J. W. Whang K. C. Jhan C. C. Su J. W. Chen Photonics System Simulation and Design Laboratory National Taiwan University of Science and Technology Taipei Taiwan Department of Electro-Optical Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Electronic Engineering National Taiwan University of Science and Technology Taipei Taiwan

This paper explores the design of a collimating lens based on freeform method. With this freeform structure, the light can be propagated as nearly parallel light which allow the light be transmitted to a large distanc... 详细信息

关键词： Lenses Lighting Vectors Educational institutions Laboratories Renewable energy sources Optical fibers

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Research and implementation of distributed disaster recovery system based on PRS algorithm

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第3期7卷 91-106页

作者： Wan, Jian Xuan, Huijia Zhang, Jilin School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex System Modeling and Simulation Ministry of Education Hangzhou China Electric Engineering School Zhejiang University Hangzhou China

With the advent of the information age, the data volumes of various industries are in explosive growth, which increasingly highlights the importance of data. When a disaster occurs, how to recover the data completely and rapidly is one of the important issues receiving common concerns throughout the current industrial and academic circles. Based on the traditional disaster recovery system, this paper researches and implements a PRS algorithm-based distributed disaster recovery system[1, 2] called OsnDDR, which ensures the high availability of the system under the circumstance of continuous disasters or multi-node damage. The system adopts PRS algorithm based on RS erasure code [3] to reduce the storage resource consumption caused by the data redundancy and designs the load balancing strategy to guarantee the load balancing of each disaster recovery center in the system. © 2014 SERSC.

关键词： Disasters

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Improved optimization for data disaster recovery system over low-bandwidth networks

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第5期7卷 1-16页

作者： Wan, Jian Hong, Xiaolong Zhang, Jinlin School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex System Modeling and Simulation Ministry of Education Hangzhou China Electric Engineering School Zhejiang University Hangzhou China

Data generated by various fields are increasing exponentially and thus results in challenges for data performances in both scales of diversity and complexity. The problem how to solve the bottlenecks of low-bandwidth networks has been of fatal significance for all kinds of network status. We present a new approach on improved optimization for data disaster recovery system (DDRS) over low-bandwidth networks that not only aims to improve the defects and deficiencies of mainstream DDRS but also helps ensure the reliable network resources for operators to conduct multi-services. A novel bandwidth self-adaptive approach (BSAA) for data packing replication was essentially established to make contribution to the integral performance improvement. A Hidden Markov Model (HMM) for predicting network status was also built to ensure system availability and stability. Experiments showed that the DDRS over low-bandwidth networks named InfoDr can effectively optimize the workload with better performance and better application self-adaptability for multi-services.

关键词： Hidden Markov models

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A modified SNR estimation algorithm based on singular value decomposition

A modified SNR estimation algorithm based on singular value ...

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2014 International Conference on Information and Communications Technologies (ICT 2014)

作者： Tao Wu Haixin Zheng Di Yan Shaolin Liu Science and Technology on Complex Electronic System Simulation Laboratory Academy of Equipment Beijing China Department of Optical and Electrical Equipment Academy of Equipment Beijing China Company of Postgraduate Management Academy of Equipment Beijing China School of Information and Communication Enginneering Beijing University of Posts and Telecommunications China

ISBN: (纸本)9781634392785

When the traditional SNR estimation algorithm based on singular value decomposition (SVD) is applied to the digital data analysis of spaceflight TT&C system, problem of large deviation arises. This paper analyzes the limitations of SVD, and proposes a modified singular value decomposition (MSVD) SNR estimation algorithm. Before estimating SNR by use of SVD, MSVD does some processing to whiten noise, such as band-pass, down-sampling, and up-sampling. The simulation results show that this algorithm can, within a large range, accurately estimate the actually received SNR, effectively improving the application scope of traditional algorithms.

关键词： Blind estimation PSK SNR SVD

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Optimization of GM (1,1) model based on bilevel programming

Optimization of GM (1,1) model based on bilevel programming

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2013 5th International Conference on Intelligent Human-Machine systems and Cybernetics, IHMSC 2013

作者： Chen, Bolin Ke, Hongfa School of Optoelectronic Engineering Changchun University of Science and Technology Changchun China Laboratory of Complex Electronic System Simulation Academy of Equipment Beijing China

ISBN: (纸本)9780769550114

GM (1, 1) is a biased grey exponential model, whose accuracy depends on the structure of background values and the selection of original conditions. Current literatures optimized GM (1, 1) models just by optimizing background values or original conditions separately, or by combining them jointly. However, these methods all ignored the accumulative errors between the optimization of background value and the optimization of original condition. Besides, they can not reflect the dynamic characteristics of the data sequence. Considering the accumulation and spread of the error between the optimization of background value and that of original condition, a new optimized model of GM (1, 1) Based on bilevel programming is put forward. The bilevel programming model is set up on the basis of two objective functions which minimize the square sum of relative errors. Various weights are optimized for individual data sequence. Furthermore, a validity analysis method Based on the grey relational degree between simulation data sequence and the original one is introduced. The simulation results show that the proposed model has extremely high fitting accuracy regardless of the scale of development coefficient. Both of approachability and similarity of the simulation data sequence to the original one reach the best. © 2013 IEEE.

关键词： Errors

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Research on modeling and simulation of complex adaptive systems based on multi-agent

Research on modeling and simulation of complex adaptive syst...

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3rd International Conference on Materials science and Information technology, MSIT 2013

作者： Liao, Shan Liang Lai, Jia Zhe Company of Postgraduate Management The Academy of Equipment Beijing China Science and Technology on Complex Electronic System Simulation Laboratory The Academy of Equipment Beijing China

ISBN: (纸本)9783037857700

With the rapid development of complex adaptive systems, traditional modeling and simulation methods have been unable to meet the need of accurate modeling of complex adaptive systems. Therefore, we need a way to accurately describe the characteristics of complex adaptive systems modeling and simulation. Multi-Agent modeling and simulation methods focus on the study of the interaction between multiple subjects. It is an effective way to study complex adaptive system. This paper analyzes the multi-agent modeling process, sets up a rumor spreading model of a small social network through multi-agent modeling and simulation methods,. The simulation results verify the correctness and accuracy of the model. © (2013) Trans Tech Publications, Switzerland.

关键词： Adaptive systems

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Predicting web service QoS via combining matrix factorization with network location

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International Journal of u- and e- Service, science and technology 2014年第3期7卷 303-318页

作者： Zhou, Li Song, Zhibo Zhai, Suichu Xiao, Tan Yin, Yuyu School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Key Laboratory of Complex System Modeling and Simulation Ministry of Education China Hangzhou Power Supply Cooperation Hangzhou China Electric Engineering School Zhejiang University Hangzhou China

With the increasing abundance of Web Services across Internet, Quality of Service (QoS)-based service recommendation has become a hot issue. It is necessary to predict the missing values of QoS for service recommendation. Because Web services run on the Internet, their network locations may be anther critical factor for QoS prediction. Although there have existed many works on QoS prediction, few consider the influence of the network locations of users or Web Services. In this paper, we propose a novel collaborative QoS prediction framework with network location-based regularization (NLBR). We first elaborate the popular Matrix Factorization (MF) model for missing values prediction. Then, by taking advantage of the local connectivity between Web services users, we incorporate network location information to identify the neighborhood. We conduct the experiments on a public large-scale real-world QoS dataset, Experiments show that our proposed approaches have the better prediction performance compared with the existed approaches. © 2014 SERSC.

关键词： Web services

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Agent-based simulation method of complex system

Agent-based simulation method of complex system

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2013 International Conference on Vehicle and Mechanical Engineering and Information technology, VMEIT 2013

作者： Lai, Jia Zhe Liao, Shan Liang Science and Technology on Complex Electronic System Simulation Laboratory The Academy of Equipment Beijing 101416 China Company of Postgraduate Management The Academy of Equipment Beijing 101416 China

ISBN: (纸本)9783037858202

In this paper a method is introduced to simulate the complex system by ABMS. space system can be considered a complex system that is composed of many satellites,which need a powerful and flexible method to study, MAS structure of space system is gived by analyzing its hiberarchy, by studying the navigation agent, a typical agent structure is gived. introduce the RepastHPC agent platform using MPI, orbit forecasting method is studying, Finally, we realize the MAS simulation and run it on parallel cluster. © (2013) Trans Tech Publications, Switzerland.

关键词： Multi agent systems

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