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Browsing Quaestiones Informaticae Vol 6 No 1 by Type "Article"

Browsing Quaestiones Informaticae Vol 6 No 1 by Type "Article"

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  • A detailed look at operating system processes 
    Venter, B.H. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    An operating system provides, among other things, an operational definition of a process. The concept of a process is one of the fundamental concepts of Computer Science, and the designer of an operating system must strive ...
  • A new general-purpose operating system 
    Venter, B.H. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    The current generation of widely-used, multi-user, general-purpose operating systems have evolved from versions that were designed when many of the issues that are important today were unimportant or not even thought of. ...
  • Protection Graph Rewriting Grammars and the Take/Grant Security Model 
    Von Solms, S.H.; De Villiers, D.P. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    The operations in the Take/Grant Protection Model are formalised using theory and results from the discipline of formal languages. A Protection Graph Rewriting Grammar is defined, which generates protection graphs consistent ...
  • Protocol Performance Using Image Protocols 
    Kritzinger, Pieter S. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    Performance analyses of data communication systems do not always rely on a detailed analysis of the underlying protocols. Those analyses which do, usually rely on an analysis of the protocol state transition graph. These ...
  • A Structural Model of Information Systems Theory 
    Mende, J. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    The laws and techniques of maJure sub1ects such as Physics and Electrical Engineering are logically connected to one another in the form of a deductive network There is a foundation of basic laws deriving from them ...
  • The use of colour in raster graphics 
    Smit, P.J. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    Colour computer graphics covers a wide field of applications such as games, computer aided-design, image processing and digital terrain modelling. The traditional way of using colour in raster graphics systems, the RGB ...
  • Using NLC-Grammars to Formalise the Take/Grant and Send/Receive Security Models 
    De Villiers, D.P.; Von Solms, S.H. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    In this paper the Send/Receive and Take/Grant logical security models are formalised using results from formal language theory. By using the graph rewriting facilities of NLC-grammars, and by extending these facilities ...

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