5  CONCLUSIONS 
In  order  to  improve  the  accuracy  of  the  intrusion 
detection for imbalanced training datasets, this paper 
proposes an effective model, which include 3 parts: 
1)  NKSMOTE-a  modified  unbalanced  data 
processing  method.  2)  feature  reduction  based  on 
correlation analysis, which  reduces  the  original 41-
dimensional feature  to  a  25-dimensional  feature.  3) 
parallel  SVM  algorithm  combining  clustering  and 
classification. 
The  experimental  results  illustrate  that  our 
proposed detection method can obtain an outstanding 
performance with a high ACC, a high DR, a low FAR 
and a rapid training speed. However, the results show 
that  our  method  has  no  advantage  in  testing  time 
comparing  with  other  newly  related  works. 
Therefore,  we  will  consider  to  improve  the 
performance of the proposed method in running time. 
ACKNOWLEDGEMENTS 
The authors would like  to  thank the  editorial board 
and  reviewers.  This  work  was  supported  by  the 
Construction  Project  of  Network  Security  System 
(XXH13507);  the  Strategic  Priority  Research 
Program  of  Chinese  Academy  of  Sciences 
(XDC02030600). 
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