系统优化在电信业务运营商运行维护中的意义

以中国联通网络中DWDM系统和SDH系统为例，阐述网络优化和传输设备的系统优化过程以及优化在网络维护中的意义。     

21世纪电子元件的发展趋势

２１世纪电子元件的发展趋势主要是元件片式化、包装编带化、生产专业化和规模化、工艺精细化、生产环境“绿色化”,电子元件企业要创新管理,并在生产过程中符合社会保障的要求。鉴于市场日益国际化,电子元件的发展更应顺从知识经济规律。     

Noncooperative exchange using money and broker-dealers

This paper presents a model of exchange where a single commodity serves as a means of payment and trade must pass through designated brokers. Broker buy and sell prices, trader allocations, and broker profits depend on the buy and sell decisions of all the market participants, and the exchange problem is described as a noncooperative game. The existence of an equilibrium is established and bounds are placed on the price spread on each commodity. Finally, the properties of the noncooperative equilibria under replication are examined.     

PBX技术.市态.营销.选购

本文介绍了ＰＢＸ交换机的技术及市场需求态势。并提出ＰＢＸ产品的营销要素及其用户在选购时应遵循的原则。     

A Study of Target Market and Administration Tactics of Advertisement Letter Service

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硅集成电路发展趋势及展望

本文阐述了硅集成电路的发展趋势,并对集成电路的市场进行了展望。     

网络经济下开源运动的抉择探析

从寡头垄断市场结构角度来分析开源运动现象存在的内在实质原因，并对开源后的寡头领先企业和跟随企业对市场规模的影响和企业的决策行为选择进行深入分析，并对在这种环境下的各自的优势和劣势进行了对比分析，指出了对中国企业的借鉴作用。     

无线数据增值业务平台垄断与竞争商务模式

商务模式，乏移动商务的重要研究内容之一，随着无线数据增值业务的快速发展，人们发现开放或封闭的商务模式都可以找到成功和不太成功的案例。首先对中间平台商务模式的组织架构进行了定性的讨论，然后在建立理论模型的基础上对无线数据增值业务平台商务模式中开放和封闭的组织结构对平台利润的影响进行了比较分析，给出了不同商务模式所适用的不同条件。     

Asymmetric conditional volatility in international stock markets

Recent studies show that a negative shock in stock prices will generate more volatility than a positive shock of similar magnitude. The aim of this paper is to appraise the hypothesis under which the conditional mean and the conditional variance of stock returns are asymmetric functions of past information. We compare the results for the Portuguese Stock Market Index PSI 20 with six other Stock Market Indices, namely the SP 500, FTSE 100, DAX 30, CAC 40, ASE 20, and IBEX 35. In order to assess asymmetric volatility we use autoregressive conditional heteroskedasticity specifications known as TARCH and EGARCH. We also test for asymmetry after controlling for the effect of macroeconomic factors on stock market returns using TAR and M-TAR specifications within a VAR framework. Our results show that the conditional variance is an asymmetric function of past innovations raising proportionately more during market declines, a phenomenon known as the leverage effect. However, when we control for the effect of changes in macroeconomic variables, we find no significant evidence of asymmetric behaviour of the stock market returns. There are some signs that the Portuguese Stock Market tends to show somewhat less market efficiency than other markets since the effect of the shocks appear to take a longer time to dissipate.     

第三代移动通信经营权角逐的背后

目前，全球对第三代移动通信（３Ｇ）经营权的争夺已硝烟四起，各国已拍卖或即将拍卖的每张３Ｇ的经营执照都达到几十亿美元之多。各大通信公司出重金购买３Ｇ经营执照主要基于：３Ｇ的技术性能优势、自身的生存需要和巨额的赢利预期。３Ｇ经营权的争夺说明全球电信市场的开放实际上只是对少数实力雄厚的大公司的开发，各国的移动通信市场不可避免地被少数几家垄断寡头所控制，中国以此必须作出积极的反应。