检索结果-南通市图书馆

Asynchronous cooperative communication systems:A survey on signal designs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(information Sciences) 2011年第8期54卷 1547-1561页

作者： WANG HuiMing 1,2 & XIA XiangGen 3 1 School of Electronic and information engineering, Xi’an jiaotong university, Xi’an 710049,china 2 State Key Laboratory of Integrated Services Networks, Xidian university,Xi’an 710049, china 3 Department of electrical and Computer engineering,university of Delaware,Newark,DE 19716,USA School of Electronic and information engineering Xi’an Jiaotong University Xi’an China State Key Laboratory of Integrated Services Networks Xidian University Xi’an China Department of electrical and Computer engineering University of Delaware Newark USA

Cooperative communications is a promising technique for future high speed wireless *** systems may be formulated as virtual multi-input multi-output (MIMO) systems where spatial/cooperetive diversity is a key advantage. However,different from MIMO systems,one of the major chal- lenges for cooperative communications systems is that the cooperative transmissions in cooperative systems may be neither time nor frequency synchronized,since the transmissions are from multiple cooperative nodes at different *** existing signal designs for co-located MIMO systems may not be able to collect the cooperative diversity in cooperative communications *** paper gives an overview of recent research efforts on combating the time and frequency asynchronism of the cooperative communication *** focus on the signal designs (or space-time codings/modulations) to achieve full cooperative diversity,and summarize some of the resent distributed space-timing coding and space-frequency coding techniques to combat timing errors and frequency offsets,and in the meantime to achieve full cooperative diversity,in both one-way and two-way cooperative networks.

关键词： cooperative communications time and frequency offsets space-time coding space-frequency codes full cooperative diversity linear receiver

A hybrid Differential Evolution Algorithm for Nonlinear Parameter Estimation of Kinetic Systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A hybrid Differential Evolution Algorithm for Nonlinear Para...

Research and Design of IP Phone Based on VoIP Technology

第24届中国控制与决策会议

作者： Chao Zhao, Aimin An college of Chemistry and Chemical engineering, FuZhou university,FuZhou,350108,P.R.china. Qiaolin Xu Faculty of School of electrical engineering and information engineering, lanzhou university of Technology, lanzhou,Gansu 730050, china

The determination of the optimal model parameters for kinetic systems development of kinetic models is a time consuming, iterative process [1]. In this paper, we presented a novel hybrid Differential Evolution （DE） algorithm for solving kinetic parameter estimation problems based on the Differential Evolution technique together with a local search strategy. By combining the merits of DE with Gauss-Newton method, the proposed hybrid approach employs a DE algorithm for identifying promising regions of the solution space followed by use of Gauss-Newton method to determine the optimum in the identified regions. The computational results indicate that the global searching ability and the convergence speed of this hybrid algorithm are significantly improved. Additionally, study of kinetic model parameters for an irreversible, first-order reaction system was carried out to test the applicability of the proposed algorithm. The suggested method can be used to estimate suitable values for the model parameters of a complex mathematical model.

关键词： Parameter estimation Kinetic models Hybrid Differential Evolution (HDE) Guass-Newton method

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

微计算机信息 2003年第9期 88-89+16页

作者： Yuan,Zhanting Zhang,Qiuyu Sun,Wei(college of electrical and information engineering,Gansu Univ.of Tech.,lanzhou730050,china)

To present a VoIP-based solution to LAN/Intranet-oriented IP *** core is low power dissipation DSP chip in charge of voice codec and8/16bit single-chip in charge of communications protocol processing and control *** IP Phone can be used either as a desktop PC peripheral or as an Internet network terminal by RJ45or other *** pa-per introduces VoIP technology and H.323protocol stack,and some details of hardware design architecture are discussed yet.

关键词： IP Phone VoIP H.323protocol DSP

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

汉字图的设计及其在新型图形密码中的应用

数学的实践与认识 2018年第14期48卷 156-164页

作者：牟亚蓉张小慧姚兵西北师范大学数学与统计学院甘肃兰州730070 兰州交通大学电子与信息工程学院甘肃兰州730070

给出汉字的一种数学模型，叫做拓扑图（运筹学科），也称为汉字图（信息学科）．利用汉字的数学模型来设计新型图形密码（Topsnut—GPWs），以及在Topsnut—GPWs中的应用．证明了可以将任意一棵非平凡树拆分为若干个汉字图，并证明了对... 详细信息

给出汉字的一种数学模型，叫做拓扑图（运筹学科），也称为汉字图（信息学科）．利用汉字的数学模型来设计新型图形密码（Topsnut—GPWs），以及在Topsnut—GPWs中的应用．证明了可以将任意一棵非平凡树拆分为若干个汉字图，并证明了对独体无圈的汉字图实施边-串联运算后得到的树具有奇优美标号．最后提出关于汉字图研究的一些问题．

关键词：汉字图独体字数学模型奇优美标号集有序优美标号

Remote condition fault diagnosis system of Wind Turbines based on Data Mining Technology

在线全文

学校读者我要写书评

暂无评论

Remote condition fault diagnosis system of Wind Turbines bas...

有限波长转换能力光突发交换网络动态波长分配机制

第三届国际自动化测试与仪器仪表学术会议

作者： Wang Huizhong Liu Guang Wang Xiaopeng (college of electrical and information engineering lanzhou Univ.of Tech 730050 china)

＜正＞A remote condition monitoring and fault diagnosis system based on data-Mining technology has been researched to ensure the large-scale Wind Turbine Generator System （WTGS） of security,stability,economy,and optimizing *** paper introduces the system’s hardware structure,software structure,and network communication. Finally,a concrete application of the system has been proved the system practicable and valid.

关键词： Wind turbine remote monitoring Fault diagnosis Data- mining

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

上海交通大学学报 2009年第3期43卷 355-360页

作者：许毅范戈上海交通大学电子信息与电气工程学院上海200240

为了解决下一代可商用化的有限波长转换能力光突发交换(OBS-LWCC)网中突发包资源竞争问题,根据波长转换器所在的位置分布,将整个网络解构为多个波长连续性子段.基于分解后的网络模型,对各种波长分配算法的突发阻塞性能进行分析和综合比... 详细信息

为了解决下一代可商用化的有限波长转换能力光突发交换(OBS-LWCC)网中突发包资源竞争问题,根据波长转换器所在的位置分布,将整个网络解构为多个波长连续性子段.基于分解后的网络模型,对各种波长分配算法的突发阻塞性能进行分析和综合比较,采用传统优先级计算与子段模型结构相结合的方法,提出一种新的分布式动态波长分配策略PWA-leg.仿真实验表明,在OBS-LWCC网络结构中关键的波长可转换节点处,该算法实现了突发业务最佳承载波长(信道)的智能选择,与传统波长分配算法相比,具有更低的全网突发包阻塞率,能够更好地适应动态突发包业务和网络拓扑的变化.

关键词：光突发交换波长转换波长连续性限制突发竞争波长分配

基于变精度粗糙集的多属性群决策信息系统安全评估

在线全文

学校读者我要写书评

暂无评论

上海交通大学学报 2009年第7期43卷 1161-1166页

作者：赵亮薛质上海交通大学电子信息与电气工程学院上海200240

为了获取信息系统安全状况并制定相应的安全解决方案,提出了基于变精度粗糙集(VPRS)的多属性群决策安全评估方法.以某高校校园网络系统作为评估样本,在信息系统安全评估模型的基础上,将VPRS与层次分析法(AHP)相结合,利用VPRS分类质量的... 详细信息

为了获取信息系统安全状况并制定相应的安全解决方案,提出了基于变精度粗糙集(VPRS)的多属性群决策安全评估方法.以某高校校园网络系统作为评估样本,在信息系统安全评估模型的基础上,将VPRS与层次分析法(AHP)相结合,利用VPRS分类质量的概念,挖掘出隐含在数据背后的内在规律.在确定安全属性权重的基础上,对信息系统进行综合安全评估.实例证明,该方法可以有效解决多属性群决策的瓶颈问题,在信息系统安全评估中具有实际意义.

关键词：安全评估信息系统多属性群决策变精度粗糙集

Face Recognition via Adaptive Image Combination

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai jiaotong university(Science) 2010年第5期15卷 600-603页

作者：于威威 college of information engineering Shanghai Maritime University

Dimension reduction and manifold learning are the two most popular feature extraction *** two methods focus on spatial locality as a guiding principle to find a low-dimensional basis for describing high-dimensional data,but no bases or features are more spatially localized than the original image ***,adaptive image combination is presented to represent a class by a combined *** combined sample is a linear combination of original samples in the same *** image combination (AIC) find the best combination coefficients by minimizing the intrapersonal distance and maximizing the interpersonal *** results show that AIC is effective.

关键词： face recognition feature extraction adaptive image combination (AIC)

An Improved Model-based Control Scheme for Networked System

在线全文

学校读者我要写书评

暂无评论

An Improved Model-based Control Scheme for Networked System