基于用户描述的可配置汇编器

针对传统固定指令集处理器的汇编器开发周期长、无法及时适应可配置处理器指令集需求变化的问题,提出一种基于用户描述的可配置汇编器的设计和实现方法,高度抽象汇编器中依赖指令集的部分,通过对指令集高层次描述,快速将指令集的变化映射到汇编器源代码上。实验结果表明,该方法可降低汇编器50％左右的开发工作。     

移动城域网SR专线热备保护方案

文章详细介绍了移动城域网的现状,并对城域网专线保护现状进行了详细分析,同时提出了两种新的SR专线热备保护方案:"单臂BFD+管理VRRP"专线热备方案和"Eth-CFM+SRRP"专线热备方案,并对这两种方案进行了详细的比较。     

BFD研究及在3G网络中的应用设计

BFD协议能提供标准的、快速、轻负荷、低时延链路故障检测。该文主要介绍了BFD的原理及在WCDMA中的IUB接口中的应用设计,并且给出了相应的测试结果,最后总结中给出了BFD协议应用在其他技术领域的展望。     

省建DNS容灾体系的设计与实现

DNS作为互联网核心业务,其重要性不言而喻,随着运营商越来越多使用Anycast的组网结构承载DNS业务,DNS大都建设为双节点,双节点部署至不同的机楼,这样就可以起到异地容灾的作用。在正常的情况下,当单节点退服,另一节点可以起到替代的作用,但是如果节点没有完全退服,此时就需要人为地进行切换,并且会影响故障时长,笔者提出一种解决方案,可以通过配置来实现双节点的逻辑上的冗余,当节点发生故障时,无论是完全退服故障或是不完全退服,均可以实现DNS业务的双节点间的切换,并且做到用户无感知。     

利用双向转发检测技术实现MPLS L3VPN的快速检测

BFD(双向转发检测)技术能够极大地弥补现有的检测技术在MPLS L3 VPN(多协议标签交换类型三层虚拟专用网)中实现错误检测需时长而无法满足通信需求的缺憾.系统将利用BFD错误检测机制需时短的特性,由其实现对MPLS L3 VPN中LSP(标签交换通道)的快速检测.     

基于路由交换技术的静态专线冗余备份方法

为提升政企高端市场宽带保障的服务质量和客户满意度,南京电信政企客户支撑中心综合考虑客户接入设备层次、网络管理水平和客户需求等因素,以公司推进的维护服务产品化工作为契机,创新性地提出基于路由交换技术的静态专线宽带冗余备份方法,并及时在省市级重点保障大客户中推广,极大地提升了政企大客户的静态专线宽带接入冗余保障能力。     

基于改进BFD算法的多规格一维下料系统

针对现有的计算机下料系统在算法和工作流程方面存在的不足,提出基于改进BFD算法的多规格一维下料求解方法,同时引入流程再造的思想,改善优化下料的工作流程,在此基础上开发了新型的计算机优化下料系统。     

IPRAN网络业务闪断故障定位与分析

IPRAN即IP化的无线接入网,具备综合业务承载能力。不仅能为2G/3G/LTE基站提供承载服务,还能提供核心网设备承载和政企大客户业务专线等服务。因此IPRAN网络不仅需要考虑承载能力,实现电信级的保护倒换机制,还需要工程师对维护过程中发生的各类故障进行定位和分析,确保语音、视频等高实时性业务的服务质量。     

Color‐difference formula performance for several datasets of small color differences based on visual uncertainty

Visual uncertainty, while reported, is not used routinely when evaluating color‐difference formula performance in comparison with visual data; rather, data are analyzed assuming no uncertainty; that is, repeating the experiment would result in the identical average results. Previously, Shen and Berns developed three methods to determine whether a color‐difference formula was well‐fitting, under‐fitting, or over‐fitting visual data when visual uncertainty was considered, the method dependent on how the uncertainty was reported and the colorimetric sampling of the color‐difference stimuli. The “nonellipsoid standard error method” was used in the current analyses. Three datasets were evaluated: BFD‐P, Leeds, and Witt. For the BFD‐P data, incorporating visual uncertainty led to the same performance results as the average results, that CIEDE2000 was an improvement over CIE94, which was an improvement over CIELAB. For the Witt data, incorporating visual uncertainty led to the same performance results as the average results, that CIEDE2000 and CIE94 had equivalent performance, both an improvement over CIELAB. However, both formulas under‐fitted the visual results; thus, neither formula was optimal. For the Leeds dataset, the visual uncertainty analysis did not support the improvement of CIEDE2000 over CIE94 that occurred when evaluating the average results. Both formulas well fit the visual data. These analyses also provided insight into the tradeoffs between the number of color‐difference pairs and the number of observations when fitting a local contour of equal perceived color difference: In particular, increasing the number of observations was more important than increasing the number of color‐difference pairs. Finally, average standard error could be used to approximate visual uncertainty defined using STRESS. © 2010 Wiley Periodicals, Inc. Col Res Appl, 2011