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Attribute reduction is a core research topic of rough set, but classical attribute reduction algorithm and its extended algorithms base on decision tables with decision attributes and can not be applied to attribute reduction of abnormal decision tables without decision attributes. So, based on rough set theory, it studied abnormal decision tables in fractal dimension and presented a heuristic attribute...
With the continuous development of network technology, Web mail technology has become an important means of information transmission and management in government agencies, enterprises and individuals, however, the subsequent problems of protecting web mail security has become a concern to users. This paper presents a free, flexible and not dependent on the mail protocol web mail forensics system model...
People pay great attention on the indoor air pollution of public building now. Indoor environment of six university buildings (library, laboratory, classroom, dormitory, computer room and office) were measured with gas detector from March to May. The concentrations of total volatile organic compounds (VOCs) of these sites meet the "Indoor air quality standards "requirements of China. The...
With the rapid development of World Wide Web, text categorization has played an important role in organizing and processing large amount of text data. TFmiddotIDF is a simple and quick term weighting method, and widely used in text categorization. But the drawback of TFmiddotIDF is large weight may be assigned to rarely appeared terms in despite of the posterior distribution. This paper presents a...
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