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网络舆情监测系统实时定向采集主流权威有影响力的微博、新闻、论坛、博客等网站信息,抽取舆情要素,发现舆情热点,挖掘舆情敏感话题,及时预警,追踪发展情况,并研判舆情态势。本文就此进行简要论述。 相似文献
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In order to solve the poor performance in text classification when using traditional formula of mutual information (MI),a feature selection algorithm were proposed based on improved mutual information.The improved mutual information algorithm,which is on the basis of traditional improved mutual information methods that enhance the MI value of negative characteristics and feature’s frequency,supports the concept of concentration degree and dispersion degree.In accordance with the concept of concentration degree and dispersion degree,formulas which embody concentration degree and dispersion degree were constructed and the improved mutual information was implemented based on these.In this paper,the feature selection algorithm was applied based on improved mutual information to a text classifier based on Biomimetic Pattern Recognition and it was compared with several other feature selection methods.The experimental results showed that the improved mutual information feature selection method greatly enhances the performance compared with traditional mutual information feature selection methods and the performance is better than that of information gain.Through the introduction of the concept of concentration degree and dispersion degree,the improved mutual information feature selection method greatly improves the performance of text classification system. 相似文献
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本通过分析舆情信息采集策略,提出智能化的关键词追踪模型,通过关键词智能追踪模型的应用,网络舆情监测系统能及时抓取热点事件的热点关键词,从而实现网络舆情监控系统对热点事件发展趋势的灵敏响应,并为网络舆情热点事件的预警提供数据支持。简单来说关键词智能追踪模型就是以一定的关键词权重算法为基础,依据舆情事件变化速度,通过多次的反复的归纳计算,对之前选取的关键词进行修改、调整和校对的过程。 相似文献
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由于国产结晶器振动液压缸(以下简称振动缸)使用寿命普遍较短,严重影响生产,导致国内钢铁企业纷纷选择进口振动缸。虽然价格昂贵,但使用寿命远远超过国产振动缸,明显提高铸坯质量。根据生产和维修记录,总结了振动缸的主要失效形式。分析失效原因,借鉴国外密封技术,采用间隙密封[1]结构,同时对活塞、活塞杆、伺服环[1]和缸筒内壁进行热处理,使其具有摩擦系数小、泄露少等特点,从而提高振动缸的使用寿命。实践证明,该振动缸的使用寿命接近进口振动缸的使用寿命。 相似文献
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