A Temporal Query System for Protocol-Directed Decision Support
A Temporal Query System for Protocol-Directed Decision Support
复制标题
用于协议导向决策支持的时态查询系统
DOI:
10.1055/s-0038-1635036
复制
发表时间:
1994
影响因子:
1.7
通讯作者:
M. Musen
中科院分区:
文献类型:
--
作者:
Amar K. Das;M. Musen
Abstract: Chronus is a query system that supports temporal extensions to the Structured Query Language (SQL) for relational databases. Although the relational data model can store time-stamped data and can permit simple temporal-comparison operations, it does not provide either a closed or a sufficient algebra for manipulating temporal data. In this paper, we outline an algebra that maintains a consistent relational representation of temporal data and that allows the type of temporal queries needed for protocol-directed decision support. We also discuss how Chronus can translate between our temporal algebra and the relational algebra used for SQL queries. We have applied our system to the task of screening patients for clinical trials. Our results demonstrate that Chronus can express sufficiently all required temporal queries, and that the search time of such queries is similar to that of standard SQL.
DOI:
10.1016/0010-4809(91)90016-p
发表时间:
1991
期刊:
Computers and biomedical research, an international journal
影响因子:
--
作者:
Kahn,MG;Tu,S;Fagan,LM
通讯作者:
Fagan,LM
DOI:
10.1006/cbmr.1993.1018
发表时间:
1993
期刊:
Computers and biomedical research, an international journal
影响因子:
--
作者:
Shahar,Y;Musen,MA
通讯作者:
Musen,MA
DOI:
--
发表时间:
1992
期刊:
Proceedings. Symposium on Computer Applications in Medical Care
影响因子:
--
作者:
Musen,MA;Carlson,RW;Fagan,LM;Deresinski,SC;Shortliffe,EH
通讯作者:
Shortliffe,EH