Implementing OSI-based interfaces for network management

Experience acquired in the development of an interface between a fiber optic system and a prototype management system developed using an object-oriented approach is discussed. Open System Interconnection (OSI) implementation concerns, the use of an ASN.1 compiler, and the use of standard application programming interfaces (APIs) are described. The role of the seven-layer OSI stack in exchanging information between managing operating systems and managed network elements is reviewed. The implementation of an OSI stack on a SUN workstation using the UNIX operating system is also described. Methods for passive and active testing of the resulting programs are discussed     

一种双光幕弹丸测速系统设计与实现

在现在代武器的研究中,需要对弹丸速度进行高精度测量,因此设计了一种软硬件结合的双光幕测速系统。整个系统以FPGA为控制核心,通过控制硬件电路实现对前端光幕传感器电流信号的调理及采集,之后将数据存储并通过网口上传到上位机。设计中对转换后的信号进行了软件调零,解决了传统硬件调零不稳定的问题,同时采用弹底触发的方式进行计时,提高了弹丸测速的准确性。与传统测速系统相比,该系统具有精度高、灵活性好等优点。通过多次测试与实验,该系统已成功应用于某军工产品的研制中。     

Realization of a Signaling System No. 7 Network for AT&T

Transition of the AT&T Communications Common Channel Interoffice Signaling (CCIS) Network, currently the world's largest, to a more powerful and flexible network with Common Channel Signaling System No. 7 capability has begun with the introduction of a more powerful signaling transfer point system and high-speed data links. The evolving AT&T network will be a key element in supporting an Integrated Services Digital Network (ISDN) capability. This paper describes the status of the existing AT&T CCIS network and how it will evolve toward a new network employing Signaling System No. 7 utilizing the ISDN User part (ISDN-UP). It also considers Signaling System No. 7 ISDN-UP implementation and the flexibility of the ISDNUP protocol in support of future customer needs.     

DNESYS-an expert system for automatic extraction of drainagenetworks from digital elevation data

The problems that arose in earlier programs to map drainage systems are analyzed in detail. An expert system called the drainage Network Extraction System (DNESYS) is described. It uses both local operator and global reasoning to extract drainage networks and ridge lines. A stream representation called a parameterized directed graph (PDG) is constructed to model a drainage system. The construction of the model begins with an initial pixel labeling procedure. Then, a network tracing and property measurement procedure converts the two-dimensional low-level labeling information into a symbolic database for high-level processing. The application of Dempster-Shafer evidence theory allows evidence collection and uncertain reasoning to be performed against the DNESYS knowledge-base that contains the drainage system model and the organized expert knowledge. By discarding erroneous information and supplying missing information, DNESYS produces a complete PDG which can be converted into the final drainage system     

基于多核网络处理器平台的网络入侵检测系统方案研究

网络入侵检测是网络安全研究领域的重要方向之一。本文全面分析了网络入侵检测系统的实现技术,结合Cavium公司的多核网络处理器的架构特点及其混合操作系统的特性,提出了基于多核网络处理器的网络入侵检测系统方案,确保了系统吞吐能力、扩展性分析。     

基于WinCE的网络嗅探器的设计与实现

网络嗅探器是网络数据包捕获和解析的基本工具.提出了一种基于WinCE嵌入式系统网络嗅探器的设计和实现方案,利用了Winpcap库函数实现网络数据包捕获功能,分析了Winpcap和NDIS网络驱动程序的结构与联系,给出了网络数据包的传递与解析流程,并将Winpcap在WinCE平台上进行移植.经应用测试表明,该网络探嗅器具有较好的系统兼容性和广泛适用性.     

Modeling and accomplishing the BEREC network neutrality policy

Network neutrality (NN) is a principle of equal treatment of data in network infrastructures with fairness and universality being the primary outcomes of the NN management practice. For networks, the accomplishment of NN management practice is essential to deal with heterogeneous user requirements and the ever-increasing data traffic. Current tools and methods address the NN problem by detecting network neutrality violations and detecting traffic differentiation. This paper proposes the NN-PCM (Network Neutrality Policy Conformance Module) that deploys the BEREC network neutrality policy using a bandwidth allocation model (BAM). The NN-PCM new approach allocates bandwidth to network users and accomplishes the BEREC NN policy concomitantly. Network neutrality is achieved by grouping users with similar traffic requirements in classes and leveraging the bandwidth allocation model's characteristics. The conceptual analysis and simulation results indicate that NN-PCM allocates bandwidth to users and accomplishes BEREC network neutrality conformance by design with transparent, nondiscriminatory, exceptional, and proportional management practices.     

远程遥控驾驶场景下基于网络信息开放的QoS预测

5G系统的飞速发展支持许多车联网用例对服务质量（quality of service,Qo S）的苛刻要求。但网络和应用的适配仍然存在很多问题。网络信息开放是一种潜在的解决方案,旨在实现网络向应用程序实时提供蜂窝无线网络信息,从而帮助服务提供方实现更好的策略控制并改善用户体验。提出一种基于网络信息开放的服务质量预测（predictive QoS,PQo S）方法,通过提前预测即将发生的网络变化来支持应用做出提前响应,提高用户的体验质量（qualityofexperience,Qo E）。介绍了网络信息开放及PQo S的背景,并介绍了PQo S的国内外研究、标准及落地现状;提出一种远程遥控驾驶（tele-operateddriving,To D）场景下基于网络信息开放的Qo S预测方法;对实际测试的数据进行分析,评估验证了PQo S的可行性。结果表明,基于网络信息开放的Qo S预测技术能够良好地支持包括5G ToD在内的车联网应用,为5G系统在智慧交通行业的落地提供了参考。     

基于PC104无人机网络视频系统的构建

无人机网络视频系统是无人机的重要组成部分,现在提出了一种基于PC104工控机的网络视频系统构建方案,从视频数据采集、压缩及传输等多个方面探讨无人机网络视频系统的构建过程并给出了网络视频系统主要部分的软件实现方案。最终实现了无人机网络视频系统的构建,实验结果表明,基于PC104无人机网络视频系统具有可靠的数据处理、传输、显示质量,可应用于监控、勘测等领域。     

基于高性能网络处理器的NIPS设计与实现

在高速网络环境下,利用入侵防御系统（IPS）对全部的网络流量进行检测是一项十分巨大挑战。网络处理器是专门处理和转发网络数据流的高速可编程处理器,在网络交换及通信设备中有着十分广泛的应用。论文首先介绍IPS的特点,及其在网络安全中的重要作用;接着,详细介绍Intel高性能网络处理器的硬件组成和框架,并给出一种基于Intel高性能网络处理器的NIPS的具体设计与实现方案。     

基于AJAX技术的县区级配电Web GIS系统的实现

Web GIS(网络地理信息系统)是目前地理信息系统发展的一种趋势,互联网的公众用户不需要安装专门的地图软件,也不需要具有专业的软件操作能力,只要登陆互联网就可以体验到网络地理信息带来的直观与方便快捷.根据农村配电网络的特点,通过引入.NET和AJAX技术,设计了县区级农村配电网络地理信息系统.主要介绍了AJAX技术原理,软件开发的平台和系统实现的主要功能.     

中国国家金融网络的规划设计和应用

正在试点的中国国家金融网络，是一个基于开放系统结构的，支持国家级金融应用系统的数据通信网络，它有用模块化结构设计，物理网络分主干网和区域子网２层，并将向准网格状网络拓扑演进。网络层以Ｘ．２５协议为基础并引入了帧中继技术。该网的网管系统和灾难恢复措施使网络具有较高的安全性。ＣＮＦＮ将全方位地为我国金融界广大用户提供各类数据通信服务。     

A control and management network for wireless ATM systems

This paper describes the design of a control and management network (orderwire) for a mobile wireless Asynchronous Transfer Mode (ATM) network. This mobile wireless ATM network is part of the Rapidly Deployable Radio Network (RDRN). The orderwire system consists of a packet radio network which overlays the mobile wireless ATM network. Each network element in this network uses Global Positioning System (GPS) information to control a beamforming antenna subsystem which provides for spatial reuse. This paper also proposes a novel Virtual Network Configuration (VNC) algorithm for predictive network configuration. A mobile ATM Private Network–Network Interface (PNNI) based on VNC is also discussed. Finally, as a prelude to the system implementation, results of a Maisie simulation of the orderwire system are discussed. This revised version was published online in June 2006 with corrections to the Cover Date.     

A Flexible QoS-aware Service Gateway for Heterogeneous Wireless Networks

The integration of different types of wireless access networks, or heterogeneous wireless networks (HWN), is emerging. This article investigates in particular how a combination of UMTS (Universal Mobile Telecommunications System) cellular networks, wireless LAN ad hoc networks, and DVB-H (digital video broadcasting - handheld) broadcasting networks, called UWD networks for short, is constructed and managed to provide users with QoS-aware services. Given the complexity of the UWD networks, a novel policy-based service gateway is proposed. As a software framework sitting over and communicating with the UWD network, this UWD service gateway makes network management decision by reasoning over a set of predefined policies that describe the behaviors of the UWD network. Network variables such as bandwidth, delay, and mobility in policies are fuzzified using fuzzy control theory to make the service gateway (as well as the whole UWD network) more flexible and robust. Both the prototype implementation and the evaluation results indicate the feasibility and effectiveness of the system     

基于网络编码的分布式天线系统性能分析

文章针对多输入多输出（MIMO）系统在移动终端实现上的限制,提出分布式天线系统（DAS）的解决方案来获得空间分集增益。采用DAS模型,通过使用一个具有网络编码解码运算能力的辅助天线增强用户与基站间的通信,探讨基于网络编码的天线分集增益。分析比较无辅助天线系统、简单DAS和基于网络编码的DAS中断概率性能后,理论分析和计算机仿真结果表明,相比简单DAS,基于网络编码的DAS节约硬件成本并提高了频谱利用率;系统中断概率平均降低0．0164,可获得更大的分集增益。     

基于LabVIEW的远程网络数据采集与分析

为了能够在环境恶劣的场合将采集到的数据实时传送给工作人员,设计一套基于LabVIEW的远程网络数据采集与分析系统。通过计算机的运算功能和声卡的A/D转换技术,在LabVIEW软件开发平台下采用TCP/IP协议,实现数据的远程传输和信号的采集、滤波、功率谱的分析以及信号的显示。该方案具有实施简单、界面友好优点,可以推广到环境噪声监测和实验室测量等多种领域。     

刍议高校数字化校园网络系统设计与应用

数字化校园已成为衡量高等院校教学水平和管理水平的重要标志,而校园网络系统是数字化校园的重要基础设施.本文主要介绍了高校数字化校园网络系统的规划设计方案.对校园网的设计目标和功能需求作了详细分析, 重点论述了校园网拓扑结构及IP、路由规划,并对网络安全系统和网络管理系统提出了自己的设计.     

基于TVOS机顶盒的儿童模式设计及实现方案

基于广电网络TVOS机顶盒上线的儿童节目种类繁多、内容丰富,为用户提供了较好体验的“儿童视听大餐”。然而在广电网络TVOS机顶盒中儿童节目入口呈现分散性,且没有针对不同用户的不同需求展示对应的儿童节目,也即缺少儿童节目的用户自定义展示。这就需要在广电网络TVOS机顶盒中设计一种针对儿童的专用儿童模式,在聚合不同入口的儿童节目的同时也支持在TVOS机顶盒侧儿童节目的用户自编排与自定义展示,以达到TVOS机顶盒中儿童节目展示界面千人千面的效果。因此提出一种儿童模式设计并且在TVOS机顶盒上探讨技术实现的可行性,在一定程度上补充了广电网络TVOS机顶盒儿童模式设计的方法,为国内对TVOS机顶盒儿童模式设计有类似需求的广电网络同行提供一个参考。     

配网生产指挥系统及其信息交互方式研究

配网生产指挥系统（Distribution Network Production Command Systemfor Urban Power Grid Company）是在配电自动化的基础上,通过配电信息交互总线集成包括生产管理系统（PMS）等系统的信息和应用,面向配电调度人员和生产运行人员,为配电生产运行提供综合管理...     

TVS-2000红外热像仪图像信息的快速处理研究

针对ＴＶＳ－２０００红外热像仪原机配置的信息处理软件不能实现实时采集、显示、处理等缺陷，研究开发了热图像数据的快速采集、存储及处理软件技术。通过ＧＰＩＢ接口在ＰＣ机与红外热像仪之间进行通信，实现了温度数据的快速连续采集；将采集存储的温度数据在计算机屏幕上显示出来，并对其进行多种处理，以利于用户获取最关心的信息。这些分析包括静态分析和动态分析。其中静态分析可以得到热图像上任意点的温度值，任意区域内的温度分布直方图，任意水平、垂直线上的温度分布剖面及其最高、最低、平均温度值；动态分析可得到任意点在给定时间段内的温度变化走势。文中介绍的新配置系统及实现的功能和软件设计方法，对于配有ＧＰＩＢ接口的智能仪器具有普遍应用价值