Quaestiones Informaticae (QI): Recent submissions

  • A data structure for exchanging geographical information 
    Cooper, A.K. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    Geographical information consists of non-spatial information (alphanumeric) and spatial information (vector and raster), the relationships between the non-spatial information and the spatial information, as well as ...
  • 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. ...
  • 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 ...
  • Generating relations using formal grammars 
    von Solms, S. H. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    Grammars generating 2-dimensional arrays have been studied by many people [1, 2, 3, 4). One effort was Random Context Array Grammars [4], where different types of context conditions placed on the production, were used ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Pointers as a data type 
    Philips, N.C.K.; Postma, Stef W. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    The distinction between an abstract data type and an implementation of a data type is not as clear as is commonly thought. A hash table can be used to implement the type bag but few of our colleagues think of a hash table ...
  • Common approach to some informational systems 
    Orlowska, M.E. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    In this paper we consider relationships between a complete system [6], an L-system [3], a stochastic system [13] and an N-system [8]. We introduce a notion of the induction of one system by another. We prove the important ...
  • Three packaging rules for information system design 
    Mende, J. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    After identifying the processing functions required in a computer based information system, the designer needs to combine them into an optimal set of load units. Some "packaging" arrangements yield a better system ...
  • The ELSIM language: an FSM-based language for the ELSIM SEE 
    Du Plessis, A.L.; Bornman, C.H. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    A fonnal requirements specification language, the ELSIM language, is presented. The language uses conceptual models for modelling data processing, and control characteristics and behavior of real-time systems, and is ...
  • A comparison of academic and practitioner perceptions of the changing role of the systems analyst: an empirical study 
    Crossman, T.D. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    Changes in technology introduce new job responsibilities and demand new skills profiles from personnel involved in application software development. Inability to perfonn competently within these job responsibilities can ...
  • Strategic planning models for information systems 
    Bruwer, P.J.S. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    A key to the success of the information system function in organizations is a comprehensive, effective planning system. According to R.V. Head's[l] pyramid structure of an Information system managers are classified into ...
  • A model to evaluate the success of information centres in organizations 
    Bruwer, P.J.S.; Groenewald, J.J. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    The objective of this research report was to investigate some South African organizations who have been operating information centres (IC's) successfully for more than two years. As the success of the IC is strongly · ...
  • Abstracts of Old mutual conference for Ph.D and M.Sc students In Computer Science, Stellenbosch, 2-3 October 1987 
    Unknown author (Computer Society of South Africa (on behalf of SAICSIT), 1987)
  • A program development environment for microcomputers 
    Byron-Moore, S.P. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    Any distractions in the working environment can affect the quality and quantity of output. For example, noise may disturb a person's thought processes and lead to errors. In addition, the programmer is subject to other, ...
  • Rekenaar spraaksintese: die omskakeling van teks na klank 
    Wagener, M.J. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    Verslag word gelewer oor die ontwikkeling en implementering van 'n stel letter-na-klank reels vir die omskakeling van Afrikaanse teks na foneme. 'n Inleidende oorsig van rekenaar spraaksintese en 'n kort beskrywing van ...
  • Polygon shading on vector type devices 
    Scheepers, C.F. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    A method is presented whereby the interior of boundary-defined regions on vector type devices may be shaded using regular line, cross-hatch and dot patterns. Different shades are realized by changing shading parameters ...

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