Quality-of-Service Based Protection in MPLS Control WDM Mesh Networks

Intelligent methods for automatic protection and restoration are critical in optical transport mesh networks. This paper discusses the problem of quality-of-service (QoS)-based protection in terms of the protection-switching time and availability for end-to-end lightpaths in a WDM mesh network. We analyze the backup lightpath-sharing problem in such networks and study the correlation of the working lightpaths and the impact of the correlation on the sharing of the backup lightpaths. We present a multi-protocol-label-switching (MPLS) control-based fully distributed algorithm to solve the protection problem. The proposed algorithm includes intelligent and automatic procedures to set up, take down, activate, restore, and manage backup lightpaths. It greatly reduces the required resources for protection by allowing the sharing of network resources by multiple backup lightpaths. At the same time, it guarantees, if possible, to satisfy the availability requirement even with resource sharing by taking the correlation of working lightpaths into consideration. A simple analysis of the proposed algorithm in terms of computation time and message complexity indicates that the implementation of the algorithm is practical. The illustrative studies that compare the performance of 1:1, unlimited sharing, and QoS-based backup sharing algorithms indicate that QoS-based sharing achieves comparable performance as unlimited sharing, which is much better than the 1:1 backup scheme in terms of connection blocking probability, average number of connections in the network for a given offered load, and network resource utilization.     

Constructive Sets in Computable Sets

The original interpretation of the constructive set theory CZF in Martin-Loef‘s type theory uses the‘extensional identity types’.It is generally believed that these‘types’do not belong to type theory.In this paper it will be shown that the interpretation goes through without identity types.This paper will also show that the interpretation can be given in an intensional type theory.This reflects the computational nature of the interpretation.This computational aspect is reinforced by an ω-Set moel of CZF.     

BYJ型防喷脱接器的设计与应用

本文介绍了BYJ型防喷脱接器的结构和工作原理。它既有抽油杆与大泵活塞脱接功能,又能实现不压井作业施工,是大型抽油泵理想的配套工具。现场应用表明,该防喷脱接器对接成功率较高,并实现了大泵井不压井施工。     

竞争环境下电信行业的普遍服务

以引入竞争为标志的电信领域改革以来，在竞争环境下如何实现作为原有垄断经营者政治使用命的普遍服务，成了世界各国政府，企业，学术界及国际电信机构共同关注的重大问题，我国是个发展中国家，电信的普通服务远没有完成。因此在借鉴国外经验的基础上，研究和探讨竞争环境下实现普遍服务的政策和策略具有十分现实的意义。     

关于超立方体网络的容错路径选择

文章给出ｎ－维超立方体网络的容错路径选择算法，该算法具有自适应性，可以防止死锁和活锁现象的发生，应用该算法，可求出一条基于安全优先策略的可行最短路径。     

高温过热器12Cr2MoWVTib（102）钢管的显微组织和相结构分析

本文对原始状态和在火力发电厂使用不同时间的高这热器１０２钢管进行了显微组织和相结构变化规律的探讨和研究。显微组织研究表明，１０２钢管在高温高压下长期运行过程中，使用温度对显微组织和碳化物相有明显影响，而使用时间对其影响不如温度影响强烈。碳化物颗粒图象分析表明，碳化物随着使用时间缓慢长大，而新的碳化物不沉淀，使颗粒总数不断增加，颗粒，间距逐渐缩小。Ｘ射线衍射数据证明，钢管在高温长期使用过程中，ＭＣ相     

客户机／服务器计算环境

本文介绍了客户机／服务器计算环境的基本概念和产生背景，阐述了客户机／服务器计算中操作系统的选择原则及企业级客户机／服务器计算环境的特点。     

与国际综合业务数字网连接的京,沪,穗国际交换机工程

本文介绍了在新建的北京、上海、广州、国际交换机工程中采用新一代程控交换技术接通国际综合业务数字网，以及本工程采用的中继方式。     

ZXJ10机IN业务功能扩展及实现

本文从智能网的基本概念入手,论述了利用 ZXJ10程控交换系统为发展智能网业务提供支持功能的技术策略以及分阶段实现的过程,并对各个阶段能够实现的业务作了简要介绍。     

服务作业系统设计技术路线及方法体系的研究

服务项目实施需要特定的设施和作业系统。阐述了服务作业系统的特征，以工业工程和市场营销等多学科为指导，探讨了该类系统的设计目标和原理，提出了完整服务作业系统设计技术路线和方法体系。