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Browsing Quaestiones Informaticae (QI) by Title

Browsing Quaestiones Informaticae (QI) by Title

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  • A model for fault-tolerant computer systems 
    Goosen, H.A.; Hoogendoorn, C.H.; Goosen (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    Reliability is an important consideration in the design of computer systems. This is a result of the increasing complexity of computer systems and of the greater reliance placed on their continuous and correct operation. ...
  • 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 · ...
  • Modeller : a DSS for experimental study of Human-computer interaction 
    Finnie, G.R. (Computer Society of South Africa (on behalf of SAICSIT), 1986)
    This paper describes the structure of a simple nonprocedural financial modelling system designed to collect a variety of statistics on aspects of novice interaction with decision support systems. Some findings on the use ...
  • Modelling Blocking on Admission of Tasks to Computer Systems 
    Wulf, S. (Computer Society of South Africa (on behalf of SAICSIT), 1983)
    The need for modelling techniques to allow blocking of tasks prior to admission to the computer system in queueing network models is described. A detailed algorithm which presents a technique to enforce blocking by priority ...
  • Modelling distributed database concurrency control overheads 
    Rennhackkamp, M.H.; Von Solms, S.H. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    Numerous concurrency control methods have been proposed for distributed databases. Various crz·teria are used to compare these methods. The comparisons range from qualitative overviews through quantitative analyses to ...
  • Models to evaluate the state of computer Facilities at South African universities 
    Bruwer, P.J.S.; Hattingh, J.M. (Computer Society of South Africa (on behalf of SAICSIT), 1986)
    Computer technology has grown exponentially in the course of the past decade in terms of sophistication - not only with regard to hardware and networks, but also with regard to mainframe and micro-computer systems. ...
  • Nebulas as Structural Data Models 
    Van Rooyen, H.O.; Weiermans, D.J. (Computer Society of South Africa (on behalf of SAICSIT), 1983)
    Nebula modell_ing is_ a generalised structural modelling technique which applies to any finite set of objects (entities) and n-ary relat1onsh1ps (n ~2). A nebula model can be presented in either diagrammatic or tabular ...
  • New CS syllabuses at Natal (PMB) 
    Postma, Stef W. (Computer Society of South Africa (on behalf of SAICSIT), 1986)
    The Department of Computer Science of the Pietermaritzburg Campus of the University of Natal is one of the youngest departments in the country, although service courses to the Faculty of Commerce have been available ...
  • 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. ...
  • Novice attitude changes during a first course In computing: a case study 
    Finnie, G.R. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    This paper describes a study of changes in attitude toward computers exhibited by novice student users during a first course in business computing. Several dimensions of attitude were established by factor analysis. ...
  • On a Generalisation of Cayley Diagrams 
    Labuschagne, W.A.; Van Rooyen, H.O. (Computer Society of South Africa (on behalf of SAICSIT), 1984)
    A technique for partially representing binary group operations by sets of binary relations was devised by Cayley. This technique can be generalised to permit the representation of arbitrary sets of n-ary relations {n ~ ...
  • On learning styles and novice computer use 
    Finnie, G.R. (Computer Society of South Africa (on behalf of SAICSIT), 1987)
    Learning to use a decision support system involves both formal and informal teaching as well as self-teaching. Many cases have been documented of unsuccesful implementation of DSS or MIS in organisations and identifying ...
  • On syntax and semantics related to incomplete information databases 
    Orlowska, M.E. (Computer Society of South Africa (on behalf of SAICSIT), 1988)
    We propose a mathematical model of a database with incomplete information, which we call the N-system. Basically speaking, such a system stores information concerning properties of some objects. The information may be ...
  • The P-NP Question and Recent Independence Results 
    Philips, N.C.K. (Computer Society of South Africa (on behalf of SAICSIT), 1979)
    Despite intensive research the P = NP question is unresolved and the research suggests thatitis hard to answer. The corresponding question for query machines with recursive oracles is undecidable in set theory. Simply ...
  • The parallel conditional 
    Postma, Stef W.; Philips, N.C.K. (S W Postma and N C K Phillips (1988) The parallel conditional. Computer Society of South Africa (on behalf of SAICSIT), 1988)
    The parallel conditional is a new but natural programming language construct. It is particularly suited to evaluation on parallel maclunes and generalizes other well known conditionals.
  • A partial RJE pad specification to illustrate LOTOS 
    Kourie, D.G. (Computer Society of South Africa (on behalf of SAICSIT), 1986)
    LOTOS (Language Of Temporal Ordering Specification) is employed to give a partial specification of a system to connect RJE devices across an X.25 network. The system's implementation has been described fully elsewhere ...
  • A persistent programming language: preliminary Report 
    Berman, Sonia (Computer Society of South Africa (on behalf of SAICSIT), 1986)
    A persistent programming language PPL is currently being designed at the University of Cape Town. The language treats persistence (permanent storage) as an orthogonal property of data and is consistent in its treatment of ...
  • 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 ...
  • 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 ...
  • Program Design as the Tool of Preference in Computer Literacy Education, Experience, Incentives, Implications 
    Richfield, J.M. (Computer Society of South Africa (on behalf of SAICSIT), 1984)
    Structured program design is urged as a rewarding vehicle for the introduction of computer concepts to age groups ranging from mid primary school to senior management. Progressively expanded subsets of the material form ...

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