应用ABAP/4在SAP R/3系统中进行报表开发

根据总部推广,公司自2006年6月开始推广ERP项目建设,由于企业是分散型企业,各家子公司对报表需求不同,因此,需要开发一些报表程序来满足不同企业的特殊需求。文章立足于公司ERP项目建设,介绍了SAP ABAP/4的特点、编程方法、步骤等,用实例分析了ABAP/4在企业ERP系统中发挥的作用。     

Short run and long run causality in time series: inference

We propose methods for testing hypothesis of non-causality at various horizons, as defined in Dufour and Renault (Econometrica 66, (1998) 1099–1125). We study in detail the case of VAR models and we propose linear methods based on running vector autoregressions at different horizons. While the hypotheses considered are nonlinear, the proposed methods only require linear regression techniques as well as standard Gaussian asymptotic distributional theory. Bootstrap procedures are also considered. For the case of integrated processes, we propose extended regression methods that avoid nonstandard asymptotics. The methods are applied to a VAR model of the US economy.     

4D CAD在大型桥梁施工进度管理中的应用

4DCAD是三维CAD模型加上时间维形成的新技术,是CAD技术在工程施工管理领域的新发展。文章在对4DCAD技术的深入研究的基础上,建立了大型桥梁施工进度管理的4DCAD模型,并开发了相关的系统,该系统可提高施工管理的信息化水平,并可提供更多的管理信息,为项目的管理提供客观、科学的依据,具有一定的现实意义。     

Can hedging tell the full story? Reconciling differences in United States aggregate- and industry-level exchange rate risk premium

While the importance of currency movements to industry competitiveness is theoretically well established, there is little evidence that currency risk impacts US industries. Applying a conditional asset pricing model to 36 US industries, we find that all industries have a significant currency premium that adds about 2.47 percentage points to the cost of equity and accounts for approximately 11.7% of total risk premium in absolute value. Cross-industry variation in the currency premium is explained by foreign income, industry competitiveness, leverage, liquidity, and other industry characteristics, while its time variation is explained by US aggregate foreign trade, monetary policy, growth opportunities, and other macro variables. The results indicate that methodological weakness, not hedging, explains the insignificant industry currency risk premium found in previous work, thus resolving the puzzle that currency risk premium is important at the aggregate stock market level, but not at the industry level.     

第四方物流在我国发展现状及对策研究

随着经济的全球化、信息技术的发展及竞争环境的迅速变化。对物流提出了新的要求．不仅要求物流在降低成本、提供便捷服务方面有所建树，还要求物流企业能够提供一整套的供应链解决方案，以提高企业的整体竞争力。在这种情况下第四方物流这一新兴的物流方式应运而生。文章首先对第四方物流在国内外的发展现状进行总结分析，发现第四方物流在国外已进入成熟阶段．而在国内还处于萌芽阶段。其次．从发展第三方物流、培养专业物流人才、改变企业经营策略以及转变政府职能等方面．提出了在我国发展第四方物流的对策和建议。     

Urban hotel development patterns in the face of political shifts

This paper discusses changes in the spatial pattern of tourism accommodation in Jerusalem in the past 150 years. This is done with particular reference to urban development and political shifts during this period and in respect to various theoretical models relating to the location of hotels in urban areas. The time frame of the paper is divided into four chronological periods according to the main geopolitical changes in the city: the end of the Ottoman period; the period of the British Mandate; the city divided between Israel and Jordan; and the city unified under Israeli sovereignty.     

IPv4/IPv6共存与过渡技术在校园网中的研究与部署

本文主要研究IPv4/IPv6共存与过渡的3种主要技术,比较它们的优缺点,并结合目前高校校园网建设的现状,阐述了这几种过渡技术在IPv6校园网中的具体部署情况.     

A re-examination of the technological catching-up hypothesis across OECD industries

This study re-examines the catching-up hypothesis at the industry level across the main OECD countries, using panel data econometric models involving technological gap indicators calculated with a nonparametric distance function suggested by Färe et al. [Färe, R.S., Grosskopf, M.N., Norris, M., Xhang, Z., 1994. Productivity growth, technical progress, and efficiency change in industrialized countries. American Economic Review 84, 66–83]. The results show that there is statistical evidence of a catching-up process at the industry level. Moreover, both tradables and nontradables sectors exhibit catching-up effects and technology adoption from abroad. This result complements the findings by Bernard and Jones [Bernard, A.B., Jones, C.I., 1996a. Comparing apples to oranges: productivity convergence and measurement across industries and countries. American Economic Review 86(5), 1216–1238., Bernard, A.B., Jones, C.I., 1996b. Productivity across industries and countries: Time series theory and evidence. Review Of Economics and Statistics 78, 135–146], Gouyette and Perelman [Gouyette, C., Perelman, S., 1997. Productivity convergence in OECD services industries. Structural Change and Economic Dynamics 8, 279–295] and Hansson and Henrekson [Hansson, P., Henrekson, M., 1997. Catching up, social capability, government size and economic growth, in V. Bergström, eds, Government and Growth, Oxford: Clarendon Press, 61–126] that there is no (or even a slow) catching-up effect in the manufacturing sector. Moreover, social capability indicators evaluated for each country show that “Non-European” and “Central European” tradables sectors have a rather similar degree of inefficiency while “North European” countries are less efficient for both tradables and non-tradables. Lastly, both the cross country and the cross sectors dispersions of inefficiency levels are smaller for tradables sectors than for non-tradables.