中国3G通信市场的发展竞争浅析

中国通信市场的格局,也将随着3G时代的到来而被打破,未来通信领域,必将是一出精彩的三国演义.中国的移动市场不再任由中国移动一家用庭信步,唯我独尊.我们坚信,再过上一段时间等待3G网络成熟.届时,3G会褪去华丽的包蓑,走入寻常百姓家.     

论3G初期联通市场策略

2008年10月15日,新联通公司正式挂牌成立,新公司定名为"中国联合网络通信有限公司";2009年1月7日,工业和信息化部为中国移动、中国电信和中国联通发放3张第三代移动通信(3G)牌照,此举标志着我国正式进入3G时代.本文将围绕联通公司获得WCDMA牌照后在3G时代的市场定位,从宣传、业务、后台支撑三大方面论述公司所应采取的市场策略.     

2G用户向3G迁移的策略分析

3G牌照下发后,如何将用户迁移到3G的研究成为业界的焦点。首先采用系统动力学的分析方法,建立动力学模型,找出影响移动用户迁移到3G的因素。然后通过模型对增强广告力度、增大3G终端补贴、提高3G业务吸引度、降低3G资费及提高3G服务质量等策略进行仿真模拟,得出这些策略都能加快用户向3G转移的结论。     

国内移动运营商营销移动阅读业务的思考

随着我国3G网络建设的快速展开,成功实现3G应用的迫切性日益显现。移动阅读作为在国外十分成功的一种无线应用,在被中国的移动运营商移植到国内时,因为中国特殊的国情会有着不同的市场前景。除了开发基于专用阅读器的移动阅读服务之外,还要拓展使用各种已有手机终端的移动阅读才能够使移动阅读业务成熟发展。     

A Risk-Benefit Analysis of French High Fish Consumption: A QALY Approach

The health risk and the nutritional benefit of a food are usually assessed separately. Toxicologists recommend limiting the consumption of certain fish because of methylmercury; while nutritionists recommend eating more oily fish because of omega 3. A common evaluation is imperative to provide coherent recommendations. In order to evaluate the risks along with the benefits related to fish consumption, a common metric based on the quality-adjusted life year (QALY) method has been used. The impact of a theoretical change from a medium n-3 PUFAs intake to a high intake is studied, in terms of the cardiovascular system (CHD mortality, stroke mortality and morbidity) and on fetal neuronal development (IQ loss or gain). This application can be considered as a sensitive analysis of the model used and looks at the impact of changing the dose-response relationships between cardiovascular diseases and n-3 PUFAs intakes. Results show that increasing fish consumption may have a beneficial impact on health. However, the confidence interval of the overall estimation has a negative lower bound, which means that this increase in fish consumption may have a negative impact due to MeHg contamination. Some limits of the QALY approach are identified. The first concerns determination of the dose-response relationships. The second concerns the economic origins of the approach and of individual preferences. Finally, since only one beneficial aspect and one risk element were studied, consideration should be given to how other beneficial and risk components may be integrated in the model.     

Linking taxation and social protection: Evidence on redistribution and poverty reduction in Ethiopia

Although redistribution results from the simultaneous effects of taxes and transfers, analyses of their distributional effects in low‐income countries have largely been undertaken from singular perspectives. This article jointly assesses the distributional effect of taxes and transfers (through social protection) using Ethiopia as a case study. We find that Ethiopia's flagship social protection programme is more effective than income taxation in achieving poverty reduction, while neither policy achieves a sizeable reduction in overall inequality. We also find that Ethiopia does not currently have the capacity to close the poverty gap or to fully fund its main safety net programme using domestic income sources alone.     

军人电子健康档案互联互通性相关标准概述和应用建议

在介绍互联互通性概念的基础上,分析了电子健康档案互联互通性标准的分类和引用关系,并分别对互联互通性标准的3个层次,即信息集成规范、信息模型标准和信息语义标准的主要代表性标准的内容和典型应用进行了综述,提出了在军人电子健康档案系统建设中如何运用上述标准的建议。     

Return and volatility interaction between oil prices and stock markets in Saudi Arabia

The paper aims at investigating the links between world oil price and stock sector markets in Saudi Arabia over the weekly period from January 10, 2007 until September 28, 2011. To that effect, we make use of the VAR-GARCH process developed by Ling and McAleer (2003), which has the advantage to address the issue of return and volatility spillovers among the series we consider. Globally, the empirical findings show evidence of return and volatility transmission between oil price and stock sectors. However, the spillover effects are unidirectional from oil to some sectors for returns, but bidirectional for volatility patterns with more apparent links from sectors to oil. The optimal weights and hedge ratios for oil/stock portfolio holdings are sensitive to the sectors considered, and allow a better understanding of the links between sectors and oil for investors who seek for investment opportunities and want to diversify their portfolios. The findings are of great interest and have important implications for investors, market participants and policy makers.     

OIL AND THE MACROECONOMY: A QUANTITATIVE STRUCTURAL ANALYSIS

We model an open economy where macroeconomic variables fluctuate in response to oil supply shocks, as well as aggregate demand and supply shocks generated domestically and abroad. We use several robust predictions of the model to identify five fundamental shocks underlying the fluctuations of the (real) oil price, the US activity and the global business cycle. The estimates show that supply shocks generated in the global economy explain the largest fraction of the oil price fluctuations, about four times more than canonical oil supply shocks. The correlation between oil prices and the US activity varies with the type of shock.     

COMPETITION AND RELATIONAL CONTRACTS: THE ROLE OF UNEMPLOYMENT AS A DISCIPLINARY DEVICE

Abstract When workers are faced with the threat of unemployment, their relationship with a particular firm becomes valuable. As a result, a worker may comply with the terms of a relational contract that demands high effort even when performance is not enforceable by a third party. But can relational contracts motivate high effort when workers can easily find alternative jobs? We examine how competition for labor affects the emergence of relational contracts and their effectiveness in overcoming moral hazard in the labor market. We show that effective relational contracts do emerge in a market with excess demand for labor. Long‐term relationships turn out to be less frequent when there is excess demand for labor than they are in a market characterized by exogenous unemployment. However, stronger competition for labor does not impair labor market efficiency: higher wages induced by competition lead to higher effort out of concerns for reciprocity.