基于CORBA技术的OLP网管接口的设计与实现

随着电信网络中网元设备智能化和多样化程度的不断发展,网元管理系统(EMS)接口的统一化要求变得日益重要.文章主要基于电信管理论坛(TMF)规范和公共对象请求代理体系结构(CORBA)技术分析了在光线路保护(OLP)网元管理系统中OLP系统与上层网络管理系统(NMS)之间的接口的设计与实现.     

基于GMPLS的光突发交换网络的仿真研究

光突发交换技术(OBS, Optical Burst Switching)是电路交换到分组交换的过渡技术,GLOBS网络是通用多协议标记交换(GMPLS, Generahzed Multi-Protocol Label Switching)技术和OBS技术结合的产物,后者是将现有光网络技术向光因特网过渡的有效途径。提出了基于OPNET软件的G-LOBS通用仿真平台的设计,设计出了基于流量工程的资源预留(RSVP-TE, Resource Reservation Protocol-Traffic Engineering)信令模块,并用OPNET软件对RSVP-TE协议进行了仿真分析。     

双环路模拟预失真器在3G功放中的研究

预失真是目前3G功放中的主流线性化技术之一.文章介绍了一种双环路模拟预失真方案,从理论和实践上进行了推理与验证,分析了目前实验电路存在的问题,并提出了改进的措施.实验结果表明,该方案能使某3G功放的三阶互调失真比(IMD3)改善20 dB,对宽带码分多址(WCDMA)信号的邻道功率泄漏比(ACLR)改善近5 dB,可基本满足指标的要求.     

Application d'un modèle de flambement conditionné à la pose des câbles à fibres optiques

Application of a conditioned buckling solution to the laying of optical cables. Mechanical behaviour of cables submitted to an axial compressive load is subjected to buckling instabilities due to their length compared with their diameter. In some cases rigid walls modify the boundary conditions during the loading or the buckling phenomenon, it will be called conditioned buckling. This paper presents the buckling of a homogeneous cable in a horizontal circular rigid duct subjected to its own weight and an axial compressive load. Buckling load and pitch associated to sinusoidal and helical buckling are determined as transmission of axial load during buckling. A finite element simulation is computed and comparisons are made with the analytical solution. A direct application to the optical fibre cable laying in underground duct is made and experimentation is conducted with a life-sized bench designed at the LM ² S of the ENSAM of Paris and located at the CNET Lannion. Comparisons between experimental and analytical results are presented.     

IPTV增值业务平台内容管理系统的设计与实现

网络电视(IPTV)内容管理系统主要实现对IPTV第三方增值业务提供商所提供的视频和文字信息等内容进行管理的功能.文章重点描述了IPTV内容管理系统的总体设计方案,介绍了组成该系统的主要功能模块的功能及其外部接口,给出了IPTV内容管理系统的软件结构,详细讨论了IPTV内容管理系统的编程实现方法.     

IPTV增值业务平台计费系统的研究

目前,IPTV业务正逐渐走向实际运营阶段.成为电信运营商的主流宽带业务.文章主要介绍了IPTv增值业务平台计费系统的构成.描述了IPTV业务运营平台与电信B0SS系统和SP系统之间的接口.分析了系统接口间的信息同步实现方式.讨论了IPTV计费系统的计费方式.     

Amélioration du confort dynamique des trains dans l'optique d'une augmentation des vitesses

Improving dynamic train comfort to increase train speed. The permanent focus of railway competitiveness in the field of passenger transport is determined by several factors, one of which is the increase in traffic speed both on conventional and new very high speed lines. Without taking special precautions, such increases in speed could lead to an inevitable downgrading of the dynamic comfort of passengers, i.e. an increase in stresses especially of the transverse type affecting the train passengers. Such stresses are generated either by centrifugal forces when running through curves, or by vibrations transmitted by the bogies to the carbody. Alstom Transport and SNCF have pooled their efforts to prevent this deterioration and are currently undertaking research work along two lines. (1) The train tilting system as tested on a TGV of the Paris-Sud-Est class shows that there is a 15 percent speed increase on a given distance while simultaneously reducing by half the transverse acceleration to which the passengers are subjected to. (2) The so-called active transverse suspension helps to obtain at 350 km · h ⁻¹ a passenger comfort level superior to the one recorded on a TGV train running at 300 km · h ⁻¹ .