国内外分类主题一体化标引和检索系统研究进展

本文概述了近十年来国内外分类主题一体化标引和检索系统的研究进展情况 ,并对比分析了国内和国外分类主题一体化标引和检索系统的特点 ,认为建立高度专业化、综合化的超级知识库 ,是建立我国一体化情报检索语言的基础     

倒排检索系统中工作区使用策略探讨

在倒排检索系统中，工作区管理仍是一个值得研讨的问题。本文首先分析了现有的工作区管理方法存在的问题，然后博采众法之长，提出两种改进的管理方法。经综合定性比较，表明改进方法的性能较优。     

直播中手机短信的选择和使用

手机短信在广播节目中的运用,为节目增加了互动的手段,从而使传者与听者的交流更加充分,广播节目在丰富性、灵动性等方面得到拓展。但是不正确地使用手机短信,也让广播节目走向琐碎,所以广播节目的生产者要理性对待手机短信。有效规避不当使用手机短信对广播节目带来的影响。     

集成检索系统中资源选择技术及算法

介绍近年来出现的主要资源选择技术的基本思想及算法,包括基于资源相关度排序的资源选择技术、基于文献分布状况的资源选择技术、基于检索成本计算的资源选择技术和基于资源内容等级结构的资源选择技术,并对目前的资源选择技术进行分析和评价。     

压力铸造中涂料的选择和使用

压铸生产过程中,在机械的压室和冲头的配合面,模具型腔表面,浇道表面及活动部分的配合部位（如抽芯机构,硕出机构,导柱及导套等）都必须根据工艺要求喷上不同的润滑材料,统称压铸涂料,包括脱模剂,润滑剂。     

新闻主题的选择和提炼

主题是新闻的灵魂和“统帅”。人无灵魂,无异于行尸走肉：新闻无灵魂,只能是一堆零散材料。清代学者王夫之在《姜斋诗话》中说：文以意为主。“意犹帅也,无帅之兵,谓之乌合”。一篇稿子质量高低,价值大小,在很大程度上取决于主题是否正确,是否深刻。     

Web教学资源主题检索系统的设计与实现

Internet蕴涵着大量的教学资源，但因为缺乏行之有效检索工具，因而造成多数学生和教育工作者望洋兴叹。本文提出了一种基于Web的教学资源主题检索系统设计方案。该系统采用了关键词与关键模式相结合的检索方法和基于系统历史记录的搜索策略，极大地提高了教学信息的获取效率和准确性。     

电池的选择和使用

商业拍摄过程中，闪光灯是使用次数最多的器材，同时也是最费电的器材。为了达到回电迅速，放电持久的目的，我几乎使用过了所有市场上能买到的各种品牌电池。我以前曾做过金霸王电池的销售工作，通过参加厂家的业务知识培训深知碱性电池的好处：碱性电池的电压是1.5V，充电电池的电压是1.2V，碱性电池虽然没有充电电池回电速度快，可是放电平稳，放电曲线从满到无一直保持平稳状态，不会损伤摄影器材。但是在实际拍摄过程中，由于使用成本的原因，没有多少商业摄影师能够承受昂贵的电池费用开支。而且碱性电池电量一旦不足，回电时间就显得很慢很慢，充电电池则没有先兆，说没电就没电，都要提防着点，以防错失拍摄良机。在相机机身上除非应急尽量不要使用充电电池（数码相机专用电池除外），因为充电电池放电的电流不是很稳，容易损坏机身电路。     

LC Classification of a Library and Information Science Library for Maximum Shelf Retrieval

In reclassifying a Library and Information Science library from DDC to LC, an attempt was made to concentrate books with related subject headings on the shelf for maximum shelf retrieval even in cases where the Subject Authorities or C.I.P. assign them varying numbers. Most of the shelf concentration was achieved either by selecting a single number for a given heading and then classifying all books with the heading in that number or by replacing the standard LC number for a heading with one which placed it together with related books on the shelf.     

整合检索系统发展概述

文章首先概述了整合检索系统的兴起,然后介绍了整合检索的两种技术方案:基于备用性(just-in-case)处理的元数据集中索引式整合检索和基于即时性(just-in-time)处理的跨库检索系统。最后在分析这两种方案的优缺点和各自适用范围的基础上,介绍集成了两种方案的资源探索发现系统,并探讨了统一资源管理的一些新动向。     

Expanding the Use of Linked Data Value Vocabularies in PCC Cataloging

Abstract

The Program for Cooperative Cataloging's 2018–21 strategic plan includes as one of its goals to “expand [the] use of linked data value vocabularies to augment, and where feasible to replace, existing metadata practices”. This paper sets out the reasons for pursuing this goal and considers some of the implications for MARC cataloging practice.     

Classification and Subject Indexing Issues at a Mexican Library Specializing in Law Research

Abstract

Subject indexing and classification of law resources is a complex issue due to several factors: specialized meanings of legal terms, meanings across different branches of law, terms in legal systems from diverse countries, and terms in different languages. These issues led to the development of a classification and subject indexing system which will help answer the major challenges of indexing and classifying law resources in the Research Institute Library at the National Autonomous University of Mexico. Adopting its own classification required interdisciplinary work between law and information organization specialists, constant updating by legal specialists and others beyond the Legal Research Institute; and the sharing of this classification system with other institutions. Now, this classification system is used by important institutions that specialize in law, such as the network of Libraries of the Supreme Court of Justice of the Nation of Mexico. The purpose of this article is to show why and how this law classification and subject system was developed and is continuously being updated by libarians and law scholars in order for it to meet their specific needs.     

分布式情报检索系统的拓扑模型

本文建立了分布式情报检索系统的三种拓扑模型———检索拓扑 ,伪度量拓扑和相似性拓扑 ,并证明了检索拓扑与相似性拓扑具有一定的分布式特征 ,从而说明了这两种拓扑模型在分布式意义下的合理性。     

试论主题语言在网络信息检索中的应用

分析关键词语言、标题语言、叙词语言在网络信息检索中的应用现状，论述主题语言在网络信息检索领域的发展趋势。     

A Librarian-Centered Study of Perceptions of Subject Terms and Controlled Vocabulary

Controlled vocabulary and subject headings in OPAC records have proven to be useful in improving search results. The authors used a survey to gather information about librarian opinions and professional use of controlled vocabulary. Data from a range of backgrounds and expertise were examined, including academic and public libraries, and technical services as well as public services professionals. Responses overall demonstrated positive opinions of the value of controlled vocabulary, including in reference interactions as well as during bibliographic instruction sessions. Results are also examined based upon factors such as age and type of librarian.     

主题信息检索应用数据库技术的研究现状与展望

文献领域主题信息检索应用数据库技术的系统研究是数字图书馆建设的关键之一。 当前,主题信息检索应用数据库技术的研究可在两个方面展开:XML的关系数据库应用研究, XML MARC的信息描述和主题检索。参考文献30。     

图书馆自动化集成系统中的主题检索研究

从图书馆自动化系统中书目数据的主题标引和主题检索入手,系统地分析了主题检索途径在计算机检索系统中的地位和作用,探讨了主题检索发展的趋势,试图为现阶段书目数据建设提供有益的参考意见.     

A New Approach to Clustering Records in Information Retrieval Systems

This work introduces a new approach to record clustering where a hybrid algorithm is presented to cluster records based upon threshold values and the query patterns made to a particular database. The Hamming Distance of a file is used as a measure of space density. The objective of the algorithm is to minimize the Hamming Distance of the file while attaching significance to the most frequent queries being asked. Simulation experiments conducted proved that a great reduction in response time is yielded after the restructuring of a file. We study the space density properties of a file and how it affects retrieval time before and after clustering, as a means of predicting file performance and making appropriate choices of parameters. Criteria, such as, block size, threshold value, percentage of records satisfying a given set of queries, etc., which affect clustering and response time are also studied.