By using the grey system theory and method, we built a grey prediction model to predict the start and end of an active time period in future.
可用灰色系统理论和方法建立灰色预测模型，预测未来一个活跃时段的起止时间。
On the basis of experiment data in Fugou county, using the grey system theory and method, the paper study the increase production mechanism of vegetables power.
在扶沟县大李庄乡田间监测的基础上，运用灰色关联分析的理论与方法，探讨“菜椒增产素”增产作用机理。
The grey system theory and method and its application in disaster prevention were described. The further research direction on application of grey system theory in disaster prevention was proposed.
对灰色系统理论和方法及其在灾害预防中的作用进行了阐述，并指出了灰色系统理论在灾害预防中的研究方向。
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