It is indicated that the relational order between dressing factors and corn yield is as followes: basic dressing N>supplementary N>total dressing N>total dressing K>supplementary K>basic dressing P>supplementary P>total dressing P; and that of dressing N in grain formation period >dressing N in seedling period>dressing N in spike period>dressing K in s.

According to some problems existed in network intrusion detection technique,such as alerts overwhelming,false-positives and lack of alert description,this paper introduces chronicle correlation method to alert events analysis by some correlative examples.

Through the analysis of the feasibility of using the relation sequence to select the independent variables of multivariate regression model, a model is set up by combining relation sequence analySiswith regression analysis.