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Browsing South African Computer Journal 1992(6) by Title

Browsing South African Computer Journal 1992(6) by Title

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  • Efficient evaluation of regular path programs 
    Wood, PT (South African Institute of Computer Scientists and Information Technologists, 1992)
    The next generation of query languages for database systems should have the ability to express recursive queries, the efficient evaluation of which will be crucial to the success of these systems. One such query language ...
  • Evaluating the motivating environment for information systems personnel in South Africa compared to the United States 
    Couger, JD; Smith, DC (South African Institute of Computer Scientists and Information Technologists, 1992)
    The South African computer industry suffers from a shortage of skilled staff. Therefore, an important management issue is to maximise the productivity and motivation of Information Systems (IS ) staff in their current and ...
  • Extending local recovery techniques for distributed databases 
    Viktor, HL; Rennhackkamp, MH (South African Institute of Computer Scientists and Information Technologists, 1992)
    The most frequently used local database system failure recovery techniques are logging , shadowing and differential files. In a distributed database these local system failure recovery techniques may be·utilized for recovery ...
  • An implementation of Linda tuple space under the Helios operating system 
    Clayton, Peter G.; Wentworth, EP; Wells, GC; de-Heer-Menlah, FK (th African Institute of Computer Scientists and Information Technologists, 1992)
    We discuss the implementation of Rhoda, our Linda(i)-like Tuple Space server which runs under the Helios(ii) operating system. The approach analyses and partitions tuple space at compile time in order to reduce the run ...
  • An implementation of the parallel conditional 
    Jayasekera, U; Philips, N.C.K. (South African Institute of Computer Scientists and Information Technologists, 1992)
    The parallel conditional, a natural generalisation of both Lisp's COND and Dijkstra's guarded commands, is particularly suited to parallel processing. This note describes the implementation of a preprocessor that enables ...
  • Integrating similarity-based and explanation-based learning 
    Oosthuizen, GD; Avenant, C (South African Institute of Computer Scientists and Information Technologists, 1992)
    Recently, there have been various attempts to combine the strengths of similarity-based learning (SBL) and explanation­-based learning (EBL) in a single learning system. We describe a graph-based learning method called ...
  • Modelling the algebra of weakest preconditions 
    Brink, C; Rewitzky, I (th African Institute of Computer Scientists and Information Technologists, 1992)
    Dijkstra's weakest precondition semantics, as presented in textbook form by Gries, may be viewed as an equational algebra. The problem then is to find a reasonable (set-theoretic ) model of this algebra. This paper provides one.
  • Using statecharts to design and specify a direct-manipulation user interface 
    Van Zijl, L; Mitton, D (South African Institute of Computer Scientists and Information Technologists, 1992)
    Statecharts were developed by Harel et al [10] to specify complex reactive systems. In this paper we report on our application of statecharts as a design and specification tool for an X-Windows based Graphical User Interface ...

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