NSTL网络服务系统用户检索表达式研究分析

通过分析NSTL用户检索表达式发现:全文检索和字段检索的使用比例相当;精确检索只占4.08%，布尔检索表达式占38.44%，并且随着单个检索表达式中布尔运算符数量的增加，相应检索表达式的数量呈现指数递减现象，其中使用“and”运算符的比例达91%;用户最倾向使用的前5个检索字段依次为标题、关键词、出版年、作者和来源文献题名。从这些现象可以看出NSTL用户的部分检索特征，对于系统的改进具有重要意义。

Analysis on Users'''' Search Expressions in NSTL Network Service System

By analyzing the users' search expressions in NSTL system, this article finds that: full-text search and filed search are used to some tune; precise search is only used by the proportion of 4.08%; Boolean search is used by the proportion of 38.44%; the total amount of expressions will go down by the exponential curve along with the increasing of the Boolean operators in a single expression; the using proportion of 'and' operator up to 91%; five most favorable used search fields are title, keyword, publish year, author name and source document title. The paper thinks that part of the users' search characteristics can be shown from these phenomena, and this will have profound significance for system amending.