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1 引言近年来,我国铁路信息化快速发展, 铁道部已开始建立数据仓库,运用已经积累的海量的数据信息来展现运输生产的动态,实现技术经济指标的统计和灵活的多维分析。但是海量的信息带来方便的同时也带来了一些其他的问题:第一是信息量过大,难以消化;第二是信息
1 Introduction In recent years, with the rapid development of railway informationization in our country, the Ministry of Railways has started to set up a data warehouse to display the dynamic of transportation production by utilizing the huge amount of accumulated data and information, and realize the statistical and flexible multidimensional analysis of technical and economic indicators. However, the convenience brought by massive information brings with it some other problems as well: the first is that the amount of information is too large to be digested; the second is the information