本文针对目前网络入侵检测学习算法效率不高的问题,首先提出相对距离的概念,然后构造基于相对距离的竞争激活函数和相似性度量,在此基础上提出一种改进的网络入侵检测算法.该算法的优势在于:(1)相对距离能较好地区分极差较大的列属性值并实现归一化；(2)基于相对距离的竞争激活函数可以处理包含符号属性的数据,不需转换为数值,且计算复杂度较低；(3)算法不需要重置机制.通过对KDD CUP99数据集的实验,验证了在检测精度与其他算法相当的情况下,改进算法学习时间和检测时间显著减少.%Aiming at the problem of lower efficiency of network intrusion detection learning algorithms at present, a concept called relative distance is proposed in this paper, and then competitive activation and similarity measurement are constructed based on it. On that basis we put forward an improved network intrusion detection algorithm. The advantage of the improved algorithm is: (1) The relative distance can distinguish the terms of column with a large range very well and realize normalization in a lower complexity; (2) Competitive activation of relative distance can process the data which includes the characteristics in a lower computation complexity without converting characters into integers; (3) The algorithm needs no reset. Examination results on the KDD Cup99 sets show that the improved algorithm can reduce the learning time and the testing time significantly while maintaining the accuracy of detection compared to other approaches.
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