If the port is not open, the scanned host sends a packet with the RST and ack flags set.

如果端口未打开，则被扫描主机发送设置了rst和ack标志的包。

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As an effect tool of pattern recognition and data processing, rough set theory (RST) and support vector machine (SVM) have become the focus of research in machine learning.

粗糙集理论(rst)与支持向量机(SVM)作为模式识别，数据处理的有效工具，已成为机器学习的研究热点。

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In this paper, a method of text categorization based on rough set theory is presented. RST is applied to rules' extraction of the text categorization.

本文将粗糙集理论应用于文本自动分类的规则提取，提出了基于粗糙集理论的文本分类方法。

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