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31.
O. J. Boxma 《Statistica Neerlandica》1984,38(3):199-208
We consider the M/M/1-queue and derive an explicit expression for the joint distribution of the number of arrivals and the number of departures in [0, t), given the number of customers initially present. The derivation is almost purely combinatorial, it avoids the use of generating functions, and immediately yields a simple probabilistic interpretation of the result. 相似文献
32.
知识经济的发展源自于以信息技术、网络技术等高科技及其产业为发展标志的科技革命。中小企业应用Intranet技术,构建企业现代管理信息系统,对提高中小型企业的管理水平和经济效益是十分有益的。 相似文献
33.
在基于SQLServer数据系统的C/S开发中,大多数的开发平台与数据库的连接在应用中使用的是固定参数的连接模式,灵活性很差,对于服务器端的可维护性(如服务器更名,IP地址的改变,多数据库系统混合应用等)变得越来越弱,同时维护成本也随之提升,有的甚至服务器系统安装完毕后除了数据备份之外便一直不作任何变动,在安全性和数据库系统混合运用上形成很多不兼容的问题。本文提供了一种基于TCP/IP的客户机与SQLServer连接方法(使用VB开发环境描述),使得无论服务端还是客户端的维护和应用具备高度灵活性也便于安全性维护,同时这种方法也适应于广域网环境的应用。 相似文献
34.
Sunil Gupta 《Marketing Letters》1994,5(1):5-17
This paper examines the role of managerial judgment in forming a final forecast, or judging the achievability of a critical level of sales, when multiple forecasts or opinions are available to the decision maker. Several factors that can help improve the quality of human intervention are identified and incorporated in a decision aid. Experimental results show that aided combination can help the decision maker exploit her relevant private information and mitigate the generally observed negative effects of human intervention. Further, the results suggest that emphasizing expected sales, even when the organization is primarily interested in go/no-go decisions, helps improve performance. Several suggestions for future research are presented.
相似文献
35.
B. G. Doornekamp J. N. Streumer 《International Journal of Technology and Design Education》1996,6(1):61-82
In the project Technology in Secondary Education: Problem-solving in Teaching/learning Packages, two experiments regarding a construction problem and an explanation problem were conducted, in which two variants of a teching/learning package (strongly structuredvs. weakly structured) were compared. Only with the strongly structured instructional variant of the package for the explanation problem did the pupils come to a quick solution of the problem. In both experiments, the factors that influenced the problem-solving processes of the pupils were investigated. The results are of importance for curriculum developers and the authors of teaching/learning packages for Technology but further research into the factors influencing the problem solving process of pupils is necessary. 相似文献
36.
侯荣华 《中央财经大学学报》2002,(10):61-65
固定资产投资的直接目的是增加固定资产 ,应考察投资和增加固定资产的关系 ,其宏观指标为固定资产交付使用率和项目建成投产率 ;固定资产投资的最终目的是促进经济增长 ,增加国民收入 ,应考察投资和增加国民收入的关系 ,其宏观指标为固定资产投资效益系数或投资系数。我国固定资产交付使用率“七五”时期比“六五”末不断提高 ,“八五”较为平稳 ,“九五”开始回升。我国固定资产投资效益系数“六五”以来较为平稳 ,“八五”较高 ,“九五”下滑幅度较大。应采取多种措施 ,不断提高投资效益。 相似文献
37.
38.
Cynthia J. Campbell Charles E. Wasley 《Review of Quantitative Finance and Accounting》1996,6(3):309-326
We extend prior research on the empirical properties of daily trading volume and methods to detect abnormal trading volume in two ways. We compare the performance of a nonparametric test statistic with the parametric test statistic used in prior research and we study samples of NASDAQ securities as well as samples of NYSE/ASE securities. Prior research has focused exclusively on NYSE securities. We find the nonparametric test statistic is more powerful in detecting abnormal trading volume than the parametric test statistic in both samples of NYSE/ASE and NASDAQ securities. We also document that abnormal trading volume will be detected more often in samples of NYSE/ASE securities compared to NASDAQ securities. 相似文献
39.
Sources of gains from international portfolio diversification 总被引:1,自引:0,他引:1
This paper looks at the determinants of country and industry specific factors in international portfolio returns using a sample of forty eight countries and thirty nine industries over the last three decades. Country factors have remained relatively stable over the sample period while industry factors have significantly increased during the last decade and dropped again since 2000. The importance of industry and country factors is correlated with measures of economic and financial international integration and development. We find that financial market globalization is the main driving force behind the changes in relative magnitude of the different shocks. Country factors are smaller for countries integrated in world financial markets and have declined as the degree of financial integration and the number of countries pursuing financial liberalization has increased. Higher international financial integration within an industry increases the importance of industry factors in explaining returns. Economic integration of production also helps in explaining returns. Countries with a more specialized production activity have higher country shocks. 相似文献
40.
TRAMO/SEATS在危机事件中对旅游影响研究的应用 总被引:1,自引:0,他引:1
国内外对旅游危机事件的研究集中于管理方面,近年相关热点转向对旅游影响的研究.以往定性研究多,从经济数量模型进行定量分析研究的较少.本文使用在经济金融领域使用广泛的ARIMA改进版--TRAMO/SEATS方法评估危机事件,如疾病、地震等突发事件对中国旅游业的影响.作为欧盟各国统计局主要统计方法,TRAMO/SEATS方法能够最大程度地反映旅游业季节性波动的特点.通过该方法对2003年在中国内地和香港地区爆发的SARS进行实证研究,分析评估该危机事件的长期影响.在此基础上提出,国家短期内应当通过提高产品质量和拓展高质量的细分市场实现旅游效益型增长;恢复后期才可以推出更为直接的促销手法实现旅游数量型增长,采取刺激旅游人数快速增长的政策和措施. 相似文献