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A comparison of algorithms for data base compression by use of fragments as language elements 使用片段作为语言元素的数据库压缩算法的比较
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90069-2
E.J. Schuegraf, H.S. Heaps

The paper describes the advantages of using variable length equifrequent fragments as the language elements for compression coding of large data bases. The problem of finding the minimum space representation of the fragment compressed data base is equivalent to solving a shortest path problem. Three alternate algorithms for compression are described and their performance is tested on both word and text fragments. It is found that text fragments selected by a longest match algorithm produce the best results with regard to compression and use of processing time.

本文介绍了用变长等频片段作为语言元进行大型数据库压缩编码的优点。寻找碎片压缩数据库的最小空间表示的问题相当于解决最短路径问题。描述了三种替代的压缩算法，并对它们在单词和文本片段上的性能进行了测试。结果表明，采用最长匹配算法选择的文本片段在压缩和使用处理时间方面效果最好。
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引用次数: 57
Searching the medlars citation file on-line using Elhill 2 and Stairs: A comparison 使用Elhill 2和Stairs在线检索medlars引文文件:比较
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90070-9
Susanne M. Humphrey

This article is a comparison of ELHILL 2 and STAIRS programs with respect to on-line searching of the MEDLARS citation file. Areas under consideration are database characteristics, basic terminal interactions, commands, search statements, and printing citations resulting from on-line or off-line processing.

本文对ELHILL 2和STAIRS程序在MEDLARS引文文件的在线检索方面进行了比较。考虑的领域包括数据库特性、基本终端交互、命令、搜索语句以及联机或离线处理产生的打印引用。
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引用次数: 4
Information retrieval on-line 联机信息检索
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90074-6
Gerard Salton (Prof.)
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引用次数: 0
Analysis of information systems 信息系统分析
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90076-X
Augustin Merta
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引用次数: 15
Informácios tezauruszok készitésének módszertana. Varga Dénés, in the translation by I.V. Kadysheva metodika podgotovki informacionnych tezaurusov (methodology of the compilation of thesauri) in: sbornik perevodov po voprosam informacionnoj teori i praktiki, Nr
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90073-4
Gerard Salton (Prof.)
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引用次数: 0
Buy or copy? A library operations research model 购买还是复制?图书馆运筹学模型
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90071-0
William Bruce Pitt, Donald H. kraft

The problem of how much of a branch library's budget shoud be spent on acquisition of new material as opposed to holding capital in reserve to photoduplicate material at the main library upon demand is presented. A mathematical model is constructed and discussed in detail, and a solution procedure basen on a dynamic programming approach is developed. Several photoduplication policies are considered, modeled, and compared. An example problem is presented to show how the formulas work. Thus a library problem representative of the larger problems of library networks is developed further as an example of library operations research.

提出了分馆的预算应该花多少钱在购置新资料上，而不是保留资金在总馆按需复印资料。建立了数学模型并进行了详细讨论，提出了基于动态规划方法的求解程序。考虑、建模和比较了几种复印策略。给出了一个例子来说明公式是如何工作的。因此，作为图书馆运筹学的一个例子，一个代表图书馆网络更大问题的图书馆问题得到了进一步的发展。
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引用次数: 7
Computers in information data centers: Joe Ann Clifton and Duane Helgeson, Montvale, N.J.: AFIPS Press, 1973, pp. 109 $10.00 信息数据中心中的计算机:Joe Ann Clifton和Duane Helgeson, Montvale, n.j.: AFIPS Press, 1973, pp. 109 $10.00
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90075-8
K. Reilly
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引用次数: 0
Computers in information data centers 信息数据中心的计算机
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90075-8
Kevin D. Reilly
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引用次数: 0
Book reviewInformation retrieval on-line: F. W. Lancaster and E. G. Fayen. Melville Publishing Company, Los Angeles, California (1973), 597 pp. $18.50 书评——在线信息检索:兰开斯特和法延。梅尔维尔出版公司，洛杉矶，加利福尼亚(1973)，597页，18.5美元
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90074-6
G. Salton
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引用次数: 0
Informácios tezauruszok készitésének módszertana. Varga Dénés, in the translation by I.V. Kadysheva metodika podgotovki informacionnych tezaurusov (methodology of the compilation of thesauri) in: sbornik perevodov po voprosam informacionnoj teori i praktiki, Nr: 17, Moscow (1970). 108 pp
Information Storage and Retrieval
Pub Date : 1974-09-01 DOI: 10.1016/0020-0271(74)90073-4
G. Salton
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引用次数: 0
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