.png){kind=icon}
返回
A methodology to retrieve text documents from multiple databases
.png){kind=icon}
PRE
AI
DOI：10.1109/TKDE.2002.1047772.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
This paper presents a methodology for finding the n most similar documents across multiple text databases for any given query and for any positive integer n. This methodology consists of two steps. First, the contents of databases are indicated approximately by database representatives. Databases are ranked using their representatives with respect to the given query. We provide a necessary and sufficient condition to rank the databases optimally. In order to satisfy this condition, we provide three estimation methods. One estimation method is intended for short queries; the other two are for all queries. Second, we provide an algorithm, OptDocRetrv, to retrieve documents from the databases according to their rank and in a particular way. We show that if the databases containing the n most similar documents for a given query are ranked ahead of other databases, our methodology will guarantee the retrieval of the n most similar documents for the query. When the number of databases is large, we propose to organize database representatives into a hierarchy and employ a best-search algorithm to search the hierarchy. It is shown that the effectiveness of the best-search algorithm is the same as that of evaluating the user query against all database representatives.
Keyword:
distributed information retrieval
resource discovery
database selection
metasearch
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
10.4
论文数:
6.9K
被引数:
3.2W
机构
暂无机构信息
引用论文
Applications of α-alkoxyorganocuprate reagents in the regiospecific synthesis of cyclic homoaldol products.png)
Tetrahedron
TetrahedronIF0
PREAI
分享收藏QSPR Modelling of the Solubility of Drug and Drug‐like Compounds in Supercritical Carbon Dioxide
PREAI
分享收藏A corpus analysis approach for automatic query expansion and its extension to multiple databases一种自动查询扩展的语料分析方法及其对多数据库的扩展
OAAI
OAAI分享收藏Population Size and Migration of Anopheles gambiae in the Bancoumana Region of Mali and Their Significance for Efficient Vector ControlPLoS ONE
OAAI
PLoS ONEIF0
OAAI分享收藏
查看更多内容