珠海台网络硬盘多频道数字播控系统

叙述了以视频服务器为中心构建的网络化多频道自动播出系统的实践、见解和系统的特点。该系统着重考虑了视频服务器选型、系统可靠性、网络化控制及监控、信号共享等问题；同时，实现了多路同时上载、多路边播边上载，以及自动延时播出等功能。     

IKE协议的安全性分析

在简略介绍IKE协议RFC2409工作机制的基础上,对协议现有的安全问题进行了分析,并针对协议阶段1中主模式与积极模式下身份保护存在的问题提出了协议修改建议,对阶段1中安全联盟建立的可靠性进行了探讨以加强协议抵御DoS攻击的能力。     

Capacity Efficiency and Restorability of Path Protection and Rerouting in WDM Networks Subject to Dual Failures

Resilient optical networks are predominately designed to protect against single failures of fiber links. But in larger networks, operators also see dual failures. As the capacity was planned for single failures, disconnections can occur by dual failures even if enough topological connectivity is provided. In our approach the design of the network minimizes the average loss caused by dual failures, while single failures are still fully survived. High dual failure restorability is the primary aim, capacity is optimized in a second step. For WDM networks with full wavelength conversion, we formulate mixed integer linear programming models for dedicated path protection, shared (backup) path protection, and path rerouting with and without stub-release. For larger problem instances in path rerouting, we propose two heuristics. Computational results indicate that the connectivity is of much more importance for high restorability values than the overall protection capacity. Shared protection has similar restorability levels as dedicated protection while the capacity is comparable to rerouting. Rerouting surpasses the protection mechanisms in restorability and comes close to 100% dual failure survivability. Compared to single failure planning, both shared path protection and rerouting need significantly more capacity in dual failure planning.     

On Finding the Multicast Protection Tree Considering SRLG in WDM Optical Networks

In this letter, a new sharing mechanism, SRLG sharing, is proposed, which allows the links of the same shared risk link group (SRLG) in a primary light tree to share protections in WDM optical networks. In previous studies, how to share spare resources with SRLG constraints has not been studied in multicast optical networks. In this letter, considering SRLG sharing, we propose a novel algorithm –multicast with SRLG sharing (MSS)– to establish a protection light tree. Finally, the algorithm MSS and the algorithm multicast with no SRLG sharing (MNSS) are compared through a simulation to show that our new sharing scheme of SRLG sharing is more efficient than that of no SRLG sharing in terms of spare resource utilization and blocking probability.     

城域波分网络中的光环路保护分析

介绍了在城域波分网络中应用的四种环形保护倒换方案及其实现方式，并对各种保护倒换方案的特性进行了分析比较。     

关于通信导航设备电源防雷的探讨

根据通信导航设备在雷击中的损坏现象，提出了电源防雷措施，即实施分级保护，在多雷区配置防雷变压器。简单介绍了级间配合，抑制横向过电压的产生，以及接地阻抗的简单计算和正确选用等，以达到对电源系统的有效防雷保护。     

WDM网络光层保护新算法的探讨

首先介绍了几种按照不同标准划分的WDM网络光层保护方法,然后提出了三种实现光层保护的新算法,对它们的内容和性能做了详细描述。按照提出的算法所求得的解,可以为WDM网络提供新的光层保护方式。     

新型低压抽屉式开关柜在冶金系统的应用

介绍新型低压抽屉式开关柜的结构性能和特点，并与早期低压柜作了比较。阐述了新型低压抽屉式开关柜在冶金系统应用中的几点改进情况。     

环境保护地理信息系统的设计

本文主要介绍基于计算机网络的通用型环境保护地理信息系统的功能和实现方法。     

微机型漏电保护装置的抗干扰措施浅析

本文针对微机型漏电保护装置在工业运行环境下,可能遇到的干扰进行了分析,并提出了从硬件到软件一系列行之有效的抗干扰措施。