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In keyword search over relational databases (KSORD), retrieval of user's initial query is often unsatisfying. User has to reformulate his query and execute the new query, which costs much time and effort. In this paper, a method of automatically reformulating user queries by relevance feedback is introduced, which is
some keywords, the search engine will return all the web pages related to the keywords in a reasonable order with some sort algorithm. In this process, retrieval results sort algorithm plays a significant role of user satisfaction. This paper starts from the background of sort algorithm, and introduces the history and
the linear space. BZ-tree is constructed using Z curve. BZ-tree is a balanced multi-branch tree. BZ-tree has the characteristic of B+-tree and R-tree. In BZ-tree, Z values of the points are the keywords, and all points are stored in leaf nodes, ordered by Z values. Using the reduction of the dimensionality of BZ-tree
Traditional text retrieval techniques greatly consume system resources. Although some file-sharing software realizes file positioning and high-speed downloads, they have no enough capacity to analysis variety format Chinese documents and to extract keywords. At the same time, during the operation of system, it exist
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.