A Problem of Domain Restriction in Data Bases a Logical Approach

1985 ◽  
Vol 8 (1) ◽  
pp. 1-25
Author(s):  
Andrzej W. Jankowski ◽  
Cecylia Rauszer
Keyword(s):  
Information Systems ◽  
Mathematical Models ◽  
Data Base ◽  
Mathematical Description ◽  
Data Bases ◽  
Domain Restriction ◽  
Intermediate Logic ◽  
Logical Constants ◽  
Limited Access ◽  
Logical Approach

The paper deals with the mathematical description of information systems with a limited access to a data base. Similarly as in [1] an area to which the user has access is called his priority. The information systems introduced in the paper are mathematical models for an intermediate logic with logical constants that corresponds to the priorities. The principles for operating this language are described, as well as a complete semantics is formulated.

scholarly journals Application of the Variety-Generator Approach to Searches of Personal Names in Bibliographic Data Bases--Part 2. Optimization of Key-Sets, and Evaluation of Their Retrieval Efficiency

1974 ◽  
Vol 7 (3) ◽  
pp. 201
Author(s):  
Dirk W. Fokker ◽  
Michael F. Lynch
Keyword(s):  
Information Systems ◽  
Data Base ◽  
Variable Length ◽  
Data Bases ◽  
Personal Names ◽  
Fixed Length ◽  
Bibliographic Data ◽  
Retrieval Efficiency ◽  
Types Of Information ◽  
High Degree

<p class="p1">Keys consisting of variable-length chamcter strings from the front and rear of surnames, derived by analysis of author names in a particular data base, am used to provide approximate representations of author names. When combined in appropriate ratios, and used together with keys for each of the first two initials of personal names, they provide a high degree of discrimination in search.</p> <p class="p1">Methods for optimization of key-sets are described, and the performance of key-sets varying in size between <span class="s1">150 </span>and <span class="s1">300 </span>is determined at file sizes of up to <span class="s1">50,000 </span>name entries. The effects of varying the proportions of the queries present in the file are also examined. The results obtained with fixed-length keys are compared with those for variable-length keys, showing the latter to be greatly superior.</p> <p class="p1">Implications of the work for a variety of types of information systems are discussed.</p>

Data structures and accessing in data-base systems, I: Evolution of information systems

1973 ◽  
Vol 12 (1) ◽  
pp. 30-44 ◽  
Author(s):  
M. E. Senko ◽  
E. B. Altman ◽  
M. M. Astrahan ◽  
P. L. Fehder
Keyword(s):  
Information Systems ◽  
Data Base ◽  
Data Structures

The use of thesauri in online retrieval

1984 ◽  
Vol 8 (2) ◽  
pp. 63-66 ◽  
Author(s):  
C.P.R. Dubois
Keyword(s):  
Information Retrieval ◽  
Data Base ◽  
Case Studies ◽  
Controlled Vocabulary ◽  
Free Text ◽  
Data Bases ◽  
Online Data ◽  
Controlled Vocabularies ◽  
Semantic Maps ◽  
Actual Use

The controlled vocabulary versus the free text approach to information retrieval is reviewed from the mid 1960s to the early 1980s. The dominance of the free text approach following the Cranfield tests is increasingly coming into question as a result of tests on existing online data bases and case studies. This is supported by two case studies on the Coffeeline data base. The differences and values of the two approaches are explored considering thesauri as semantic maps. It is suggested that the most appropriate evaluatory technique for indexing languages is to study the actual use made of various techniques in a wide variety of search environments. Such research is becoming more urgent. Economic and other reasons for the scarcity of online thesauri are reviewed and suggestions are made for methods to secure revenue from thesaurus display facilities. Finally, the promising outlook for renewed develop ment of controlled vocabularies with more effective online display techniques is mentioned, although such development must be based on firm research of user behaviour and needs.

lnformatiestromen en gegevensbanken inde parlementaire werkzaamheden

Res Publica ◽  
1989 ◽  
Vol 31 (2) ◽  
pp. 181-188
Author(s):  
Louis Vanvelthoven
Keyword(s):  
Data Base ◽  
Information Flow ◽  
Telephone Network ◽  
The Other ◽  
Direct Access ◽  
External Information ◽  
Data Bases ◽  
The Public ◽  
Public Data ◽  
Set Up

Opening up as many sources of information as possible is particularly conducive to the development of workable policy plans and to efficient decision-making in a democratic political system. It follows that MPs can greatly benefit from using computerized information systems.As far as the parliamentary activities are concerned, we can distinguish between internal and external information flow. The contents of the parliamentary documents, the procedure for processing them and the information on the parliamentary control are part of the internal information flow. The external information on the other hand refers to the relations between the MPs and the executive and the judiciary branches, supranational and international institutions as well as the library.To date, the House of Representatives has been the only assembly that has set up a computerized information system . The data bases of the House comprise : the parliamentary documents and the state of advancement of all proceedings linked to these documents (bath in the House and in the Senate) until the publication of the text in the official state journal. Other databases relate to the parliamentary control : interpellations, motions, oral questions and the entire text of the written parliamentary questions.The record of the House will also be stored in a data base giving references. The library fund has been integrated in the interlibrary network DOBIS-LIBIS.  A data base was also designed for the press information, and linked to an image processing system.What has been realized in the House to date must also be feasible for the other parliamentary assemblies. Viewed from that perspective, it seems advisable that data bases be centralized in one parliamentary information DP centre. Access to this centre should be particulary user-friendly and uniform, so much so that all MPs can make maximum use of it.The system set up by the House meets with an ever increasing demand from other possible users. In this context, attention should be drawn to the interconnection of this system with other parliamentary assemblies, the extension of the system to other users in the House ofthe MPs and the external access to the system via the telephone network: direct access for the universities, and for certain public and private institutions and individual MPs, and the BISTEL and/ or VIDEOTEX access.The majority of the public data bases linked to the telephone network can be interrogated via the BISTEL system, hut many interesting applications are not accessible via the telephone network as they function in closed circuits.Opening up data bases by linking them to the telephone network, implies that the problem of cost and privacy be carefully examined. As to privacy, we should reflect on the public or confidential character of the data and its consequences, on safeguarding the information stored in the system and on the evolution ofcommunications technology from the perspective of a continental European communications network.

Mathematical models of optimal management of material support of educational and scientific activities of industrial universities

2020 ◽  
pp. 79-90
Author(s):  
N. V. Kalganova ◽  
Keyword(s):  
Higher Education ◽  
Mathematical Models ◽  
Numerical Solution ◽  
Mathematical Description ◽  
Financial Support ◽  
Software Package ◽  
Optimal Management ◽  
Material Support ◽  
Support Strategy ◽  
The University

The paper considers mathematical differential models for managing the achievement of planned values of material support for educational and scientific activities of the university based on the analysis of this area of activity of transport universities. Models contain a mathematical description of the material and financial processes under study, which analytically show their dynamics for a certain period. The models are quite simple and can be used for planning and forecasting the financial support strategy of higher education institutions. In her research, the author relied on the work of Russian scientists, in particular, on [1-5]. This paper presents a mathematical description of the set of possible options for the system, predicting the consequences of the implemented options, and justifying the rational choice of management to achieve optimal educational and material support of the university. In this paper, we used methods for solving and investigating differential equations, as well as the MathCAD 15 software package for their numerical solution [6-8].

Numeric data bases on‐line

Online Review ◽  
1977 ◽  
Vol 1 (3) ◽  
pp. 207-215 ◽  
Author(s):  
James A. Luedke
Keyword(s):  
Data Base ◽  
Distributed Processing ◽  
Large Data ◽  
Training Needs ◽  
Data Bases ◽  
Textual Information ◽  
Large Data Base ◽  
User Training ◽  
On Line ◽  
Numeric Data

The activities that are at present furthering the visibility of numeric data bases and systems are discussed. A tentative estimate of the numbers of existing numeric data bases and systems in various categories of accessibility (on‐line, batch, and remotely accessible) and availability (public, restricted, and in‐house) is made. Numeric data bases and systems are becoming offered by information retrieval services through many of the channels that made bibliographic and textual information systems successful. These include remote accessibility and marketing by large data base vendors. The user community for numeric data bases is generally more restricted, with the possible exception of business and financial numeric data bases. User training needs are generally greater as well. Numeric data bases may nevertheless reach large user audiences with the advent of distributed processing and, ultimately, data base maps which can automatically locate and link together data bases in many locations.

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