害虫群落季节动态分析,采用系统聚类方法(Hierarchy Cluster)对该场主要害虫发生情况进行分析,将其分为四个阶段,其中1-3月与10-12、4-6月、7月、8-9月各自为一类。
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首先，采用动态聚类方法，将整个系统分解为几个子系统。
First, the whole system was decomposed into several subsystems by adopting fuzzy k-means cluster.
本文依据灰色系统理论，采用灰色定权聚类方法，根据国家环境质量标准，对南京市近三年地表水的质量进行评估。
According to the National Standard of Environmental Quality, we analyzed and assessed the surface water quality in Nanjing in the recent three years.
方法采用队列随访调查的方法收集居民疫水暴露的情况，并用系统聚类法中样品聚类(Q型)进行聚类分析。
Methods The data of resident's contacting infectious water were collected with cohort study, and were analyzed by sample cluster analysis (Q type).
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