企业内部网络系统建设及管理

随着计算机网络技术的不断发展,企业内部网络系统建设成为了现代企业发展的一项重要举措和趋势。本文结合企业发展需要,探讨了企业内部网络系统的建设和管理工作,包括了网络设计原则、网络技术设计、网络设备的选择及内部网使用及管理方面,可供参考借鉴。     

浅论校园网络改造实施

本论文分析了原有校园网络系统的状况及存在的问题。对校园网网络系统的整体设计,布线系统设计,拓扑结构的设计,IP地址规划等方面进行了详细的规划。采用了千兆以太网为主干的校园网络,层次化网络体系结构,核心网络层采用了双核心冗余结构,在网络系统综合布线中设计了多线路实现线路冗余和端口汇聚增加带宽。     

浅谈盐城水文局计算机网络安全维护工作

随着现代化信息技术的发展和水文工作要求的不断提高,盐城水文局计算机网络系统已经深入到水文业务活动的各个方面,现正向水情实时监测、实时传输、实时显示的方向发展,而水质自动监测系统建设也已展开,这就对网络系统安全性提出了新的要求,网络系统一旦崩溃,将会造成无法估量的损失。因此,如何加强水文计算机网络的安全性和可靠性就成为了一个亟待解决的问题。     

微机称量与物资计量网络系统的设计

本文介绍了微机称量系统以及计量网络系统的硬件设计和软件设计。微机称量系统中主要采用XK3128称重显示仪进行称重,用称重模块实现称重并记录的功能;计量网络系统采用DDN进行实时数据传输,优化了企业资源管理。     

浅谈网络处理器技术

从网络系统技术革新着手,分析网络处理器的出现的背景,介绍网络处理器的定义、技术特性及其应用领域,并针对网络处理器的设计目标和发展的需要,提出网络处珲器未来的发展趋势.     

一个远程数据网络信息系统

本钢在线监测的能源数据类型主要:高炉煤气、焦炉煤气、发生炉煤气、氧、蒸汽、水等,一级、二级计量检测点共198处,以往主要采用DDZ-Ⅲ型单元仪在线计量,日报、月报量的数据统计全由人工完成,数据信息反馈滞后,制约公司生产调度。有鉴与此,1998年我们用研华公司的ADAM5510系列PLC,建了能源数据采集网络,从而使一、二级源数据能够通过网络实时地反馈到生调度部门,提高了能源管理水平。一、网络系统的构成:数据采集网络系统分为两部分:第部分是数据传输网络系统,在计控厂公司及二级厂矿之间建立局域网,计厂计算机室设置总站,配置一套网络…     

浅谈利用冗余备份技术提高网络的可靠性

提高网络系统可靠性的方法，除了保汪系统本身的质量和规范的管理外，网络设计中主要是利用冗余备份技术设计冗余部件，即构建网络系统的备份体系，增强系统的容错能力。     

企业网络信息安全存在的风险及其防范策略

随着企业各部门之间、企业和企业之间、国际间信息交流的日益频繁,企业网络系统的安全问题已经提到重要的议事日程上来。一个技术上可行、设计上合理、投资上平衡的安全策略已经成为成功的企业网络系统的重要组成部分。本文分析了企业网络信息安全存在的风险,并提出了防范策略。     

电动汽车控制网络实时性分析研究

分析了影响电动汽车分布式控制系统实时性的主要因素,通过对整个网络系统的测试,考察了实际运行的网络的性能是否能够满足汽车动力系统的实时性要求.对目前电动汽车网络中常采用的125kb/s,250kb/s和500kb/s三种通信速率的CAN网络实时性进行了对比测试分析,结果表明:在相同的网络中,总线正常通信的情况下,提高总线通信速率,能有效降低总线负载率;10ms的信息在网络上实时性要求比较高,将主要影响网络实时性能.所得研究结果对制定电动汽车CAN网络协议具有重要参考价值.     

基于神经网络的地形匹配方法研究

提出了基于神经网络实现多特征融合的地形匹配算法，充分利用地形的各种不同的统计特征和几何特征，构造了一种地形匹配网络模型．通过对实时图和基准图的分析，给出了计算网络节点之间的权值函数，建立了网络系统能量方程，通过求系统的最小能量得到最佳匹配位置．由于网络能融合地形的不同统计特征和几何特征，所以算法大大提高了系统的抗干扰能力和定位精度，适合于实时图容易发生畸变的地形匹配领域．实验结果表明，定位精度和抗干扰能力均优于传统的地形匹配方法．     

Fast approximate methods for the reliability analysis of computer networks

The complexity of computer communication networks has taken a dramatic upswing, following significant developments in electronic technology such as medium and large scale integrated circuits and microprocessors. Although components of a computer communication network are broadly classified into software, hardware and communications, the most important problem is that of ensuring the reliable flow of information from source to destination. An important parameter in the analysis of these networks is to find the probability of obtaining a situation in which each node in the network communicates with all other remaining communication centres (nodes). This probability, termed as overall reliability, can be determined using the concept of spanning trees. As the exact reliability evaluation becomes unmanageable even for a reasonable sized system, we present an approximate technique using clustering methods. It has been shown that when component reliability ⩾ 0.9, the suggested technique gives results quite close to those obtained by exact methods with an enormous saving in computation time and memory usage. For still quicker reliability analysis while designing the topological configuration of real-time computer systems, an empirical form of the reliability index is proposed which serves as a fairly good indicator of overall reliability and can be easily incorporated in a design procedure, such as local search, to design maximally reliable computer communication network.     

一个智能化并行个人通信专用数据库机的设计方案

对个人通信网节点专用数据库计算机的模型进行了分析。基于一种层次化、分布式网络数据库的控制策略，提出了一种由并行处理机系统支持的、内存和外存结合式的数据库实现方案。该方案具有技术实现性和操作复杂性的良好折中，同时并行处理机系统能够很好地满足个人通信大容量数据库高速操作的要求。     

一种通用网络通信系统的设计与实现

在TCP／IP协议的基础上，采用合理的软件结构、算法以及对同一主机的多网卡支持，设计了一种可应用于大型分布式处理（如分布式仿真）的多机通信系统，目标是屏蔽诸如IP地址、端口号、套接字等网络通信概念，实现一种通用的进行网络通信实时可靠传输的机制，避免类似程序的重复开发，使网络通信的实现更加容易。应用结果表明，系统使用容易、通用性强，实现了对通信服务的实时传输和可靠传输的支持。     

Quantum Communication Networks and Trust Management: A Survey

This paper summarizes the state of art in quantum communication networks and trust management in recent years. As in the classical networks, trust management is the premise and foundation of quantum secure communication and cannot simply be attributed to security issues, therefore the basic and importance of trust management in quantum communication networks should be taken more seriously. Compared with other theories and techniques in quantum communication, the trust of quantum communication and trust management model in quantum communication network environment is still in its initial stage. In this paper, the core technologies of establishing secure and reliable quantum communication networks are categorized and summarized, and the trends of each direction in trust management of quantum communication network are discussed in depth.     

高速可见光通信的前沿研究进展

本文立足于通信领域近年来备受关注的研究热点--可见光通信,阐述了其研究背景和基础系统架构,围绕材料器件、高速系统、异构网络、水下可见光通信和机器学习等五个前沿研究方向展开了对可见光通信研究进展的探讨,并概述了现阶段高速可见光通信技术面临的若干挑战。最后展望了可见光通信的前景:在未来万物互联的智能时代,可见光通信将以其高速传输的优势成为通信网络中不可缺少的一部分,与其它通信方式合作互补共同造福人类生活。     

Green5G: Enhancing Capacity and Coverage in Device-to-Device Communication

With the popularity of green computing and the huge usage of networks, there is an acute need for expansion of the 5G network. 5G is used where energy efficiency is the highest priority, and it can play a pinnacle role in helping every industry to hit sustainability. While in the 5G network, conventional performance guides, such as network capacity and coverage are still major issues and need improvements. Device to Device communication (D2D) communication technology plays an important role to improve the capacity and coverage of 5G technology using different techniques. The issue of energy utilization in the IoT based system is a significant exploration center. Energy optimization in D2D communication is an important point. We need to resolve this issue for increasing system performance. Green IoT speaks to the issue of lessening energy utilization of IoT gadgets which accomplishes a supportable climate for IoT systems. In this paper, we improve the capacity and coverage of 5G technology using Multiple Inputs Multiple Outputs (MU-MIMO). MU-MIMO increases the capacity of 5G in D2D communication. We also present all the problems faced by 5G technology and proposed architecture to enhance system performance.     

A value-of-information based approach to simulation model refinement

Looped water distribution networks have traditionally been used in urban and industrial water supply. Nowadays, they are also being introduced in certain irrigation water distribution systems, such as in greenhouse horticultural systems. The design of looped networks is a much more complex problem than the design of branched ones, but their greater reliability can compensate for the increase in cost. Most articles found in the literature try to minimize the network investment cost, while other designing objectives are considered as constraints. This article introduces a multi-objective memetic algorithm that simultaneously optimizes the total investment cost, and also the reliability of the network in terms of total surplus power at the demand nodes. This memetic algorithm uses the Pareto-dominance concept to determine the quality of the solutions. The results obtained in two small water supply networks, and a large irrigation water supply network denote the good performance of the memetic algorithm here proposed in comparison with other well known meta-heuristics.     

基于无线通讯网络的机器人遥操作

在描述了基于无线通讯网络的遥操作技术原理的基础上,分析了3种具体基于无线通讯网络的机器人遥操作系统,并基于建立的遥操作系统进行了实验,对实验结果进行了分析．同时讨论了手机遥操作机器人技术,实现了手机对机器人的遥操作．从系统实验结果可以看到,基于目前移动通讯网络或无线局域网进行机器人的遥操作是可行的．     

An algorithm of discrete-time Bayesian network for reliability analysis of multilevel system with warm spare gate

Discrete-time Bayesian network (DTBN) is a popular tool for the reliability analysis of dynamic systems, which, however, is insufficient in analyzing the reliability of multilevel system (MLS) with warm spare (WSP) gates. Additionally, conventional DTBNs are not able to consider the situation that dormant components and primary components may fail during the same time interval. To this end, this paper analyzes the dynamic reliability characteristics of dormant systems with WSP gates by utilizing DTBNs. Moreover, an algorithm of modeling the conditional probability table (CPT) for WSP gates together with a new schedule of constructing dynamic Bayesian networks is put forward. The validation of the proposed techniques is implemented by Monte Carlo simulation (MCS) and reliability analysis of an actual communication station system.     

多视觉传感器CAN总线检测系统的设计

研究了多传感器CAN总线视觉检测系统的架构方式与设计方法,给出了视觉传感器的控制电路单元CAN总线控制方法,多路视频信号切换开关单元的信号切换方法,CAN总线控制网络通讯的软件设计.文章介绍的CAN总线控制系统实现了多视觉传感器的分布式网络化控制,尤其适合对实时性、可靠性和精度等要求较高的大型多传感器视觉测量系统的实时控制.