微博营销对电影票房影响的实证研究

随着微博逐渐成为电影宣传的主要平台,研究微博数据与电影票房之间的关系显得尤为重要。运用实证研究的方法,收集3个平台上电影上映前一周和上映四周这段期间每天每个影响因素的数据。将这些因素分别与票房进行相关性分析,发现每个因素都与票房成正相关,经过主成分回归分析建立了回归模型,将模型在统计的数据中进行实证研究。结果表明,该模型有很好的预测性,可以为电影制片方的营销策略提供更具有实用价值的参考。     

预应力连续箱梁顶推施工模拟研究

编制程序模拟预应力混凝土结构连续箱梁顶推法施工全过程,文章介绍了程序基本原理及其基本功能,为施工过程提供理论指导。     

250km客运专线铁路32m组合箱梁预制施工工艺

文章以新建铁路客运专线某梁场32m组合箱梁施工技术为例,介绍了目前客运专线普遍采用的32m有砟轨道后张法预应力混凝土组合箱梁的预制施工工艺,为类似工程设计、施工提供参考。     

Station level gasoline demand in an Australian market with regular price cycles*

Regular and frequent gasoline price cycles are being observed in many Australian and Canadian markets. What is driving these price cycles has been the subject of academic studies and government investigations. The existing explanations for these price cycles all rely on the presumption that drivers are intensively sensitive to gasoline price differentials at the station level. However, no empirical evidence exists in the literature to support this presumption. This paper provides the first piece of empirical evidence. This paper uses a unique price and quantity data set and novel instruments to estimate the station level gasoline demand in the cycling market of Perth, Australia. The elasticity estimates confirm that drivers in the Perth area are indeed very sensitive to gasoline price differentials.     

分形理论及其在资本市场研究中的意义

资本市场不是一个简单的线性系统 ,而是一个极其复杂的非线性系统。正因为如此 ,用分形理论来解释并预测各种复杂的经济现象便具有十分重要的现实意义。本文详细介绍了分形理论的基本概念 ,介绍了Hausdorff维数、拓扑维数和盒维数的定义 ,最后探讨了分形理论在资本市场研究中的意义。     

浅谈白盒测试之基本路径测试方法研究

本文分析了白盒测试中基本路径测试方法的相关概念，阐述了利用基本路径测试方法设计测试用例的过程，最后通过实例说明基本路径测试方法的使用。     

现浇箱梁大直径钢管支架施工工艺

阿尔及利亚东西高速公路M4标段现浇箱梁数量较多,在工期十分紧张,周转材料资源匮乏的条件下,采用大直径钢管代替碗扣支架施工,保证了工期,节省了成本,也使现浇箱梁支架施工工艺有了一定的提高。     

连续箱梁施工要点

本文简单描述了桥梁连续箱梁施工要点,重点叙述了连续箱梁施工工艺,为以后类似的施工积累经验。     

On the asymptotic behaviour of the Stringer bound1

The Stringer bound is a widely used nonparametric 100(1 -α)% upper confidence bound for the fraction of errors in an accounting population. This bound has been found in practice to be rather conservative, but no rigorous mathematical proof of the correctness of the Stringer bound as an upper confidence bound is known and also no counterexamples are available. In a pioneering paper Bickel (1992) has given some fixed sample support to the bound's conservatism together with an asymptotic expansion in probability of the Stringer bound, which has led to his claim of the asymptotic conservatism of the Stringer bound. In the present paper we obtain expansions of arbitrary order of the coefficients in the Stringer bound. As a consequence we obtain Bickel's asymptotic expansion with probability 1 and we show that the asymptotic conservatism holds for confidence levels 1 -α, with α∈ (0,1/2]. It means that in general also in a finite sampling situation the Stringer bound does not necessarily have the right confidence level. Based on our expansions we propose a modified Stringer bound which has asymptotically precisely the right nominal confidence level. Finally, we discuss other consequences of the expansions of the Stringer bound such as a central limit theorem, a law of the iterated logarithm and the functional versions of them.     

基于DCL的参数化绘图通用对话框设计

介绍在AutoCAD环境下采用Visual LISP语言及对话框设计语言(DCL)开发的通用参数化设计对话框函数。对于使用Visual LISP二次开发参数化设计或绘图程序的用户,可直接调用该函数,通过对函数代入参数,即可显示图形与参数直观对应的对话框,并可直观确定选定的参数。用户不必编写繁杂的对话框管理程序,即可写出较专业的参数设计与绘图的Visual LISP程序。