摘要： 随着问答社区信息的长期积累,越来越多的过时信息充斥在其中并被搜索引擎检索,给信息需求者带来不便。用户的网页浏览日志中隐性地包含用户的行为习惯,通过分析得到这些信息对判断网页信息时效性有着重要意义。文中提出针对网页浏览日志的查询过程划分方法,并在划分的基础之上对大量真实用户的浏览行为习惯做了统计分析。结果显示,用户查询一次信息平均浏览8.05个页面,用时6.28分钟,有将近1/3的查询在交替并发中进行,另外用户对于网站站内搜索的依赖较高。从浏览日志数据集中选取了一个社区网站的浏览记录来进行初步的网页信息时效性分析,结果表明造成用户不满意的原因主要是查询相关度不高,而过时信息只是其中一小部分。
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