低压电力线信号接入系统电磁兼容测试方法研究

针对低压电力线信号接入系统传输组网的特点,建立符合实际情况的PLC系统典型配置,并根据现有国内外通行电信标准,研究适合低压电力线信号接入系统的电磁兼容性指标,探讨PLC系统的电磁兼容测试方法.     

互联网技术与电信网技术研究

互联网的高速发展,互联网的用户群体的巨大改变,互联网外部环境的巨大变化,使原有的互联网技术和互联网的设计理念已难于适应发展的需要。互联网向何处去已引起世界各国的高度关注,互联网处于发展的十字路口;互联网技术对电信网的强烈冲击使得电信界处于相当被动的局面,电信界在寻找发展方向,寻找技术的突破口,以便自己重新立于主动地位,但至今没有找到,电信网也处于发展的十字路口。电信网和互联网的发展导致下一代网技术的发展。下一代网的关键技术是什么,这些关键技术问题能不能解决,是否可能在近期得到解决并用于商用系统,都是必须重视和研究的问题。     

三种数字集群系统的话音编码技术分析比较

在众多数字集群系统标准中 ,Motorola公司研制的综合调度增强型网络iDEN、泛欧数字集群无线系统TETRA和以色列的数字集群系统FHMA属姣姣者。在优选适合我国国情的数字集群系统标准的最后阶段 ,就是从这三种系统标准中优选一种。本文主要介绍这三种系统的话音编码技术 ,并对它们进行分析比较。     

Global Intermedia Agenda Setting: A Big Data Analysis of International News Flow

This study contributes to international news flow literature methodologically, by significantly expanding its scope, and theoretically, by incorporating intermedia agenda-setting theory, through which we reveal how news media in different countries influence each other in covering international news. With a big data analysis of 4,708 online news sources from 67 countries in 2015, the study shows that wealthier countries not only continue to attract most of the world news attention, they are also more likely to decide how other countries perceive the world. However, international news flow is not as hierarchical and U.S.-centric as found earlier. Online-only, emerging media in core countries are not necessarily more impactful in setting the world news agenda than those in (semi)peripheral countries.     

An Algorithm for Predicting the Relationship between Lemmas and Corpus Size

Much research on natural language processing (NLP), computational linguistics and lexicography has relied and depended on linguistic corpora. In recent years, many organizations around the world have been constructing their own large corpora to achieve corpus representativeness and/or linguistic comprehensiveness. However, there is no reliable guideline as to how large machine readable corpus resources should be compiled to develop practical NLP software and/or complete dictionaries for humans and computational use. In order to shed some new light on this issue, we shall reveal the flaws of several previous researches aiming to predict corpus size, especially those using pure regression or curve‐fitting methods. To overcome these flaws, we shall contrive a new mathematical tool: a piecewise curve‐fitting algorithm, and next, suggest how to determine the tolerance error of the algorithm for good prediction, using a specific corpus. Finally, we shall illustrate experimentally that the algorithm presented is valid, accurate and very reliable. We are confident that this study can contribute to solving some inherent problems of corpus linguistics, such as corpus predictability, compiling methodology, corpus representativeness and linguistic comprehensiveness.     

Third world entry into the electronic age

The leadership of Western nations in technology development, especially in telecommunications continues to be strengthened. But where does the third world fit into this high-tech scenario. Many experts believe that Western communication technologies can allow developing countries to leapfrog over the industrial age. However, this article points out that unless third world countries can develop their own infrastructure, skills and knowledge base, competing with Western nations for them could become technological Blind Man's Bluff.     

3G网络不同制式的比较与运营分析

分析了不同的3G制式之间的技术差异，不同无线制式之间的技术差异以及国外运营3G网络的成功和失败案例。四种3G制式各有利弊，不同的国家、不同的运营商都需要根据自己的情况选择适合自己的3G制式。     

电信市场准入的再思考

首先对电信市场准入原来所持有的理论依据进行了进一步的思考和探索，并结合世界上一些国家、国际组织和地区电信市场的改革开放实践，进行了进一步的分析。认为出于对规模经济的考虑和对基础电信业务具有公用事业特性的认定。从而通过监管手段对市场准入进行限制是不适当的．而是应该由市场来解决。对中国电信市场来说，它首先需要解决的是需不需要维持国有资本对基础电信行业控制，之后才谈得上电信市场准入的问题。     

Internet能给发展中国 家带来什么？

在今年９月份日内瓦国际电联（ＩＴＵ）总部ＩＴＵ发展局的研究组会议上，“Ｉｎｔｅｒｎｅｔ对发展中国家意味着什么”这个问题成为与会代表关注的一个焦点。本文作者根据参会获得的一手资料，从ＩＴＵ的角度，概括介绍了Ｉｎｔｅｒｎｅｔ基础设施及其业务在全球特别是在发展中国家的发展状况，分析了发展中国家在这一新的信息化态势面前落后的原因，以及采取相应对策所应考虑的竞争关键问题。     

A Study of the Effects of the Current InternationalSettlement of Internet

1　TheUnbalancedDevelopmentofInternetandtheDigitalDivideAmongCountries　　Withtheadvanceofinformationtechnology ,Internethaspenetratedintovariousaspectsofsocialandeconomiclifedeeplyandimprovedthedevelop mentofproductivityenormously ,which producestheobvioustendencyofeconomicglobalization .In ternetexpeditestheprocessofeconomicglobaliza tion ,throughwhichanycountrywouldbeabletoparticipateintheglobalproductionandrebuildingthetraditionalindustrymoreintensivelyandexten sively.Alotofnewinformati…