绿色供应商选择研究

绿色供应商的选择应符合循环经济和绿色供应链的发展要求,运用直觉模糊多属性决策的方法,选择绿色供应链管理中绿色供应商可以使评选出的结果更加符合实际。     

Determining an optimal hierarchical forecasting model based on the characteristics of the data set: Technical note

The efficient flow of goods and services involves addressing multilevel forecast questions, and careful consideration when aggregating or disaggregating hierarchical estimates. Assessing all possible aggregation alternatives helps to determine the statistically most accurate way of consolidating multilevel forecasts. However, doing so in a multilevel and multiproduct supply chain may prove to be a very computationally intensive and time-consuming task. In this paper, we present a new, two-level oblique linear discriminant tree model, which identifies the optimal hierarchical forecast technique for a given hierarchical database in a very time-efficient manner. We induced our model from a real-world dataset, and it separates all historical time series into the four aggregation mechanisms considered. The separation process is a function of both the positive and negative correlation groups' variances at the lowest level of the hierarchical datasets. Our primary contributions are: (1) establishing a clear-cut relationship between the correlation metrics at the lowest level of the hierarchy and the optimal aggregation mechanism for a product/service hierarchy, and (2) developing an analytical model for personalized forecast aggregation decisions, based on characteristics of a hierarchical dataset.     

双差数列的几个性质

讨论了双差数列与周期双差数列的通项公式以及求和公式。     

基于马尔柯夫分析的计算机预测和决策应用

从DSS应用现状出发,介绍了马尔柯夫分析的定义和数学原理,阐述了马尔柯夫分析的过程和预测的基本步骤,利用Excel设计了进行市场占有率预测的应用模型,并进行了仿真预测和决策分析。测试表明,应用模型简便通用,操作方便,提高了预测的计算精度和效率。     

配件物流中产品不同生命周期的配件库存预测

研究同一产品在不同生命周期对配件的库存预测方法,生命周期包括新产品,成熟产品,产品生命后周期。其中对成熟产品,产品生命后周期的配件预测给出了预测公式。     

基于B2C的中国互联网用户团购行为的实证研究

基于互联网的团购成为了中国电子商务新的增长点。传统的团购研究多关注成交机制的差异,而新的互联网团购限定了成交价格、谈判区间和边际效应,形成了具有广告效益、利润收益和客户信任为一体的中介平台。通过搜集20家中国主要的团购网站在一年中的销售数据,研究发现品牌因素、折扣大小、累积效应都对参与团购人数产生显著影响。     

浅析机队规划

随着世界金融危机的出现,航空公司的运营效益受到了很大的影响,如何提高航空公司的经济效益是当今民航界的又一主题。文章对提高我国航空公司运行效率有一定的理论指导意义。     

我国锦纶帘子布市场前景预测与应对措施

文章从国内外帘子布行业的现状及其格局的重新调整，汽车、公路运输业、轮胎相关行业的现状及发展前景，加入WTO和国家宏观政策变化对帘子布行业的影响等方面进行全面、深层次的分析，应用两种数学公式模型对未来15年的国内帘子布市场需求量的上下限进行预测，并提出应对措施。     

Entry and the Number of Firms in the Swedish Pharmaceuticals Market

This paper analyses the factors that determineentry into the Swedish pharmaceuticals market. The analysis is based onpanel data for 22 different substances covering the years 1972 to 1996. Theresults show that profit opportunities in a particular market have apositive impact on entry. In addition, there is some evidence suggestingthat the length of the patent protection period has a negative impact onentry.     

Does the financial analysts' usage of non-financial information influence the analysts' forecast accuracy? Some evidence from the Belgian sell-side financial analyst

This paper examines whether the use of non-financial information by sell-side financial analysts influences the accuracy of analysts’ forecasts. The research findings, based on a survey of Belgian financial analysts, suggest that financial analysts who use more forward-looking information and more internal-structure information offer more accurate forecasts. Furthermore, the listed Belgian firms examined in this study have improved their non-financial information reporting over time. However, neither the frequency nor the quantity of non-financial information mentioned by financial analysts in their reports appears to have increased over time.