正文：内容安全研究进展与教学内容选择 关键词】内容安全；教学内容；不良信息过滤；数字水印 [gap=905]Key words：Content security; teaching topics; bad information filtering; watermarking
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After grammatical rules are defined, a method of the state conversion is founded. Based on it, a model of filtering bad text information is presented.
在定义文法的基础上，基于状态转换方法，给出了一种不良信息文本过滤模型。
After analyzing existing information filtering model and classifying algorithm, an intelligent decision-making system for bad information which is based on ANN is proposed.
在对现有信息过滤模型以及分类算法进行分析比较的基础上提出了一个基于人工神经网络的不良信息监测智能决策系统。
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