变频调速节能改造方案的经济性评价和比较

本文详细介绍了变频调速节能改造方案的经济性评价方法。静态分析法包括投资回收期法、抵偿年限法和年计算费用法；动态分析法则包括净现值法、内部回收率法、总费用现值法和最小年费用法。     

Energy efficiency maximization resource allocation algorithm in wireless-powered backscatter communication network

In order to alleviate the energy consumption problem caused by the increasing number of Internet of things (IoT) nodes,an energy-efficient (EE) maximization based resource allocation algorithm was proposed for multi-carrier wireless-powered backscatter communication network.Firstly,a multivariable and nonlinear resource allocation model was formulated to jointly optimize transmit power,transmission time,reflection coefficient,and energy-harvesting allocation coefficient,where the maximum transmit power constraint of the power station and the minimum harvested energy constraint at the backscatter device were considered.Then,the original non-convex optimization problem was transformed into a convex one which was solved by using Dinkelbach’s method and the variable substitution approach.Furthermore,the analytical solution of the resource allocation problem was obtained based on Lagrange dual theory.Simulation results verify that the proposed algorithm has better EE by comparing it with the existing algorithm under pure backscatter mode and algorithm under the harvested-then-transmit mode.     

光纤通信在军事上的应用

简述了光纤通信在军事通信中的地位与作用，较全面介绍了陆、海、空军各领域的应用情况，阐明了军事通信对光纤通信元器件的要求和核爆炸对光纤通信的影响。     

利用ATM构造宽带INTERNET骨干网

本文分析了传统的Ｉｎｔｅｒｎｅｔ骨干网的组网方案纯路由器网络的成功及其所面临的挑战，提出在网络核心引入交换技术，通过采用ＡＴＭ构造带宽Ｉｎｔｅｒｎｅｔ骨干网，可以构更大规模的网络，使网络运营者受益，并且为将来Ｉｎｔｅｒｎｅ提供综合业务奠定坚实的基础。     

视频拨号系统

多媒体通信在市场需求和当今技术相互发展、相互促进下得到迅猛发展，视频拨号（ＶＤＴ）业务方兴未艾，市场潜力巨大。文章介绍了视频拨号业务概念、网络结构、实现方案、经营管理和业务现状。     

多路FM－SCM光波系统研制

介绍我们研制的多路ＦＭ－ＳＣＭ（调频副载波复用）光波系统及其性能，讨论了ＳＣＭ光波系统的噪声。该系统主要可用于多路ＣＡＴＶ光纤传输。采用Ｆ－Ｐ腔ＬＤ和ＰＩＮ－ＦＥＴ接收组件，通过系统优化，实现了接收端输出电视图象信号ＳＮＲ＞５５ｄＢ。     

Applications of Soliton Transmission Control in Optimal Design of Long－Haul Soliton Communication System

ＡｐｐｌｉｃａｔｉｏｎｓｏｆｃｈａｏｓｉｎｓｐｒｅａｄｓｐｅｃｔｒｕｍｃｏｍｍｕｎｉｃａｔｉｏｎｓＡｐｐｌｉｃａｔｉｏｎｓｏｆＳｏｌｉｔｏｎＴｒａｎｓｍｉｓｓｉｏｎＣｏｎｔｒｏｌｉｎＯｐｔｉｍａｌＤｅｓｉｇｎｏｆＬｏｎｇ－ＨａｕｌＳｏｌｉｔｏｎＣｏｍ...     

衡量网络可靠性的新模型

本文分析了传统的网络可靠性优化设计方法所存在的问题 ,给出了网络的通信通路数的定义 ,并基于网络的通信通路数给出了更能反映网络运行的实际情况的网络可靠性的定量模型 ,从而解决了传统网络可靠性优化设计方法所存在的问题 .     

多站远程无线控制信号系统通信软件的开发

多站远程无线控制系统是以计算机为中心控制 ,用多个信号源作为下位机通过无线模块进行通信 ,文中介绍了通过无线数传模块实现无线通讯以及ActiveX控件的使用方法 ,提出了使系统应用程序更安全可靠 ,效率更高 ,维护更加方便的几种措施。     

Allocation of jobs and identical resources with two pooling centers

We examine the resource allocation problem of partitioning identical servers into two parallel pooling centers, and simultaneously assigning job types to pooling centers. Each job type has a distinct Poisson arrival rate and a distinct holding cost per unit time. Each pooling center becomes a queueing system with an exponential service time distribution. The goal is to minimize the total holding cost. The problem is shown to be polynomial if a job type can be divided between the pooling centers, and NP-hard if dividing job types is not possible. When there are two servers and jobs cannot be divided, we demonstrate that the two pooling center configuration is rarely optimal. A heuristic which checks the single pooling center has an upper bound on the relative error of 4/3. The heuristic is extended for the multiple server problem, where relative error is bounded above by the number of servers.