D-Lib杂志中Web参考文献的可用性和持久性
The Availability and Persistence of Web References in D-Lib Magazine
摘要：
我们探讨了在D-Lib杂志上发表的文章中引用的URL的可用性和持久性。我们提取了4387个独特的URL引用的453篇文章发表于1995年7月至2004年8月。从2004年9月至2005年2月，在25周内每周检查三次是否有供应。我们发现，这些URL中大约有28%最初未能解析，30%在最后一次检查时未能解析。大多数未解决的URL是由于404（页面未找到）和500（内部服务器错误）错误。URL指向的内容相对稳定;在测试期间，只有16%的内容注册了超过1 KB的更改。我们通过检查URL的年龄、路径深度、顶级域和文件扩展名来探索可能导致URL失败的可能因素。根据收集的数据，我们发现D-Lib杂志文章中引用的URL的半衰期约为10年。我们还发现，如果URL指向.net、.edu或国家特定顶级域名中的资源，使用非标准端口（即，不是端口80），或者指向具有不常见或不推荐的扩展的资源（例如，.shtml、.ps、.txt）。
英文摘要：
We explore the availability and persistence of URLs cited in articles published in D-Lib Magazine. We extracted 4387 unique URLs referenced in 453 articles published from July 1995 to August 2004. The availability was checked three times a week for 25 weeks from September 2004 to February 2005. We found that approximately 28% of those URLs failed to resolve initially, and 30% failed to resolve at the last check. A majority of the unresolved URLs were due to 404 (page not found) and 500 (internal server error) errors. The content pointed to by the URLs was relatively stable; only 16% of the content registered more than a 1 KB change during the testing period. We explore possible factors which may cause a URL to fail by examining its age, path depth, top-level domain and file extension. Based on the data collected, we found the half-life of a URL referenced in a D-Lib Magazine article is approximately 10 years. We also found that URLs were more likely to be unavailable if they pointed to resources in the .net, .edu or country-specific top-level domain, used non-standard ports (i.e., not port 80), or pointed to resources with uncommon or deprecated extensions (e.g., .shtml, .ps, .txt).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
