关键词： hypertext   information access methods   information retrieval   text retrieval  

摘要： Information retrieval typically involves accessing textual information from a database in response to a user's vague information need, Hypertext or hypermedia, on the other hand, involves a user browsing through a database of textual or multimedia information in response to a variety of types of information need. Thus information retrieval can be said to have a searching metaphor while hypertext has a browsing analogy. Initially, these two technologies for information access appear to be very different, almost competitive in nature. In this paper information retrieval systems are briefly reviewed and hypertext systems are also examined. These two techniques for accessing information have been integrated into a prototype system which is described. The system dynamically generates guided tours in response to a user's query and the tour guides the user through the hypertext. Some experiments reporting on the effectiveness of this as an information access strategy are given.

关键词： 文献信息   工具书   文献信息检索   运筹学  

摘要： 《文献信息控制学》(学苑出版社于1991年10月出版)是我院唐建华副研究员从事多年图书馆学、文献学、图书馆情报系统运筹学、软科学的研究所获得的第二个成果,他的第一个成果是《图书馆效用分析的数学模型——图书馆运筹学》(学苑出版社于1989年12月出版),它们是姊妹篇,都是四川省科委资助的1989—1991年软科学研究项目。《文献信息控制学》应用范围较广泛,可供各行各业的管理现代化参考。该书共分7章42节,共22万多字。主要内容有文献信息控制学的兴起;文献控制学基本原理;文献信息控制的结构和机制;文献信息的工具书控制:文献控制与工具书,输人与输出控制,书目控制(索引,文摘),字典词典(词表)控制,表谱图录控制;文献信息计算机控制}文献信

关键词： 情报检索   检索系统   评价   文献  

摘要： 本文针对文献信息检索系统评价中存在的一些问题，以信息论中的熵值概念为基础着眼于系统处理过程，从而建立起对系统的有序性评价方法，并给出了用计算机实现的一种系统功能构成图．该方法为更客观地评价信息检索系统提供了有益的尝试．

关键词： ALGORITHMS   DESIGN   PERFORMANCE   DPPM, PATTERN MATCHER  

摘要： We propose a document-searching architecture based on high-speed hardware pattern matching to increase the throughput of an information retrieval system. We also propose a new parallel VLSI pattern-matching algorithm called the Data Parallel Pattern Matching (DPPM) algorithm, which serially broadcasts and compares the pattern to a block of data in parallel. The DPPM algorithm utilizes the high degree of integration of VLSI technology to attain very high-speed processing through parallelism. Performance of the DPPM has been evaluated both analytically and by simulation. Based on the simulation statistics and timing analysis on the hardware design, a search rate of multiple gigabytes per second is achievable using 2-mu-m CMOS technology. The potential performance of the proposed document-searching architecture is also analyzed using the simulation statistics of the DPPM algorithm.

ISBN: (纸本)7561101333

关键词： 文献分类法   文献工作   分面分类法   二次文献   主题法   等级分类法   分类体系   分类标准   科学技术   文献信息检索  

摘要： 一、文献分类的涵义文献是一种智力资源,对科学技术的发展和人类社会的进步,起着很大的作用。尽管各种类型文献工作部门的性质不同,但它们的主要任务,总是生产、收集、存贮、交流各种文献资源,千方百计提供各种服务。

关键词： 模糊信息   检索   dBASE-Ⅲ   数据库  

ISBN: (纸本)7561100787