Intrusion detection methods based clustering are based on distance difference, but to depend on the similarity measurement of all attributes in the same degree tend to arouse misleading.

基于聚类的入侵检测方法大都是以距离差异为基础的，而同等重要地依赖所有属性的相似性度量会引起误导。

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We propose two methods of similarity measurement: entropy difference distance measure(ED) and maximum relative entropy distance measure(MRE) .

提出了两种基于信息嫡的相似性度量方法：嫡差分距离度量和最大相关嫡度量。

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A formula of height difference precision for remote distance measurement by total station is derived in this paper. The influences on the height difference precision are analyzed and calculated.

推导了全站仪“对边测量”高差精度公式，分析并计算了各因素对高差测量精度的影响。

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