关键词： INFORMATION retrieval   INFORMATION storage & retrieval systems   TECHNOLOGICAL innovations  

摘要： We describe an evaluation model for expansion systems in information retrieval, that is, systems expanding a user selection of documents in order to provide the user with a larger set of documents sharing the same or related characteristics. Our model leads to a test protocol and practical estimates of the efficiency of an expansion system provided that it is possible for a sample of users to exhaustively scan the content of a subset of the database in order to decide which documents would have been selected by an ''ideal'' expansion system. This condition is met only by databases whose unit contents can be quickly apprehended, such as still image databases or synthetic bibliographical references. We compare our model with other types of possible indicators, and discuss the precision to which our measure can be estimated, using data from experimentation with an image database system developed by our research team.

关键词： Artificial Intelligence   Database Management Systems   Information Retrieval   Information Systems   Research NeedsKnowledge Bases   Conceptual Models   Knowledge Acquisition   Relational Approach (Information Retrieval)   Examples  

摘要： In recent years, there has been an enhancement from database management to knowledge base management. In this article, we investigate an important, yet not widely addressed issue: the role of information retrieval in this enhancement. Central to our investigation is to develop techniques of building information systems which are able to extract and store information from texts so that the stored information can be combined to satisfy unanticipated queries. Success of such techniques will have important practical impact on the automatic construction of knowledge bases from documents, thus reducing the knowledge acquisition bottleneck. We argue that this is not a task which can simply be reduced to database management through logic-based approaches (such as deductive databases), and explore an approach to achieve this by extending classical information retrieval techniques. An experiment has been carried out to implement a conceptual model for storage and retrieval of integrating short scientific documents (written in restricted English) using unstructured relational databases. This article does not address the issues dealing with general information retrieval;instead, by restricting our focus on the problem investigated, we have gained some insight on the relationship between information retrieval and database management, as well as the relationship between information retrieval and knowledge base management.

关键词： 信息检索技术   情报检索   信息技术  

关键词： Relational database systems  

摘要： This paper investigates the use of the tools available in a Relational DBMS for the purpose of developing a Group Technology (GT) application. Specifically, we will concentrate on Structured Query Language (SQL) but the possibilities of using other features such as Host Language programming and Report Generators will also be examined. The paper demonstrates the use of Relational DBMS technology as a tool for implementing a GT project in an advanced manufacturing environment.

关键词： 集合论   情报信息   情报检索  

摘要： 集合论与文献信息检索天津理工大学物理系凌梦怡集合论是十九世纪末德国数学家坎托尔（ＧｅａｒｇＣａｎｔｏｒ）创立的，现已渗透到数学各分支领域，并且在文献信息科学和其他科学领域也得到了广泛的应用。集合的概念象几何学中的点、直线一样是无需再定义的基本概念，它...

关键词： 科技情报-情报检索   情报检索-科技情报  

关键词： 科技情报   情报检索  

ISBN: (纸本)7810238450

摘要： 本书系统地阐述了科技信息检索与利用的吉恩原则和基本方法，介绍了国内外一些重要的检索工具盒使用方法。为适应建立市场经济的需要，对市场信息和技术信息的开发与利用业作了全面介绍。

关键词： 理论与实践   图书情报学   科学会堂   情报专家   科技大厦   研讨内容   软科学研究   期刊研究   洋州   文献信息检索  

摘要： 国际图书情报学理论与实践学术研讨会于5月21日——25日在武汉华中师范大学“科学会堂”和“湖北科技大厦”举行,来自世界各地的图书情报专家、学者200余人参加了大会。其中中国代表134人。境外代表分别来自29个国家和地区。即[亚洲]香港、澳门、泰国、马来西亚、新加坡、菲律宾、印度尼西亚、印度、

ISBN: (纸本)7562208972

关键词： 数据库   模糊信息   检索  

摘要： 模糊信息检索,是数据库管理信息系统和情报检索系统中经常遇到的问题。本文讨论了完全确定信息和模糊信息检索的一般概念和特点,给出了FOXBASE数据库系统中模糊信息检索的一般方法:AT检索法和＄检索法,并详细阐述了FOXBASE中各种模糊条件下,模糊信息检索的具体实现方法。对于中文信息模糊检索,重点论述和解决了目标字段错位问题,并给出了主要程序流程,使FOXBASE的模糊信息检索技术得以补充和完善。