Institutional Repository

Browsing 1987 4th Southern African Computer Symposium by Title

Browsing 1987 4th Southern African Computer Symposium by Title

Sort by: Order: Results:

  • A generalised expression structure 
    Van Biljon, WR (1987)
    The expression structure of programming languages is examined. Two weaknesses are identified. The first pertains to the inability, or limited ability, to redefine operators or to define new operators. The second pertains ...
  • Hidden surface elimination in raster graphics using visigrams 
    Gorringe, HP (1987)
    In any form of display where three-dimensional images are required to be projected onto a two-dimensional display the hidden surface or hidden line removal certainly helps to enhance the realism of the final image. This ...
  • Modelling distributed database concurrency control overheads 
    Rennhackkamp, MH (1987)
    Numerous concurrency control methods have been proposed for distributed databases. Various criteria are used to compare these methods. The comparisons range from qualitative overviews through quantitative analyses ...
  • A new general-purpose operating system 
    Venter, BH (1987)
    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. ...
  • On syntax and semantics related to incomplete information databases 
    Orlowska, ME (1987)
    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 ...
  • Petri net topologies for a specification language 
    Watson, AG (1987)
    This paper presents a formal technique for enforcing deterministic exec­ution in Petri nets, and proceeds to demonstrate how the resultant topology may be used to enforce partial sequencing so that various ...
  • Polygon shading on vector type devices 
    Scheepers, CF (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 ...
  • Protocol performance using image protocols 
    Kritzinger, PS (1987)
    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 protocol validation system 
    Punt, JL (1987)
    This paper discusses a protocol validation system. The input to the system is a protocol definition specified in the specification language ESTELLE. The ESTELLE specification is the input to a translator program which ...
  • The representation of chemical structures by random context structure grammars 
    Ehlers, EM; Von Solms, SH (1987)
    A representation of chemical molecules by Random Context Structure Grammars is proposed. Random Context Structure Grammars generate three-dimensional digital structures. Random Context Structure Grammars and Random Context ...
  • A semantic data model approach to logical data independence 
    Berman, S (1987)
    Semantic data models were originally introduced as a tool for data description and design. SDMI (Semantic Data Model Interface) investigates their use in another role - as the basis for a data manipulation language - and ...
  • Set-oriented functional style of programming 
    Mueller, CSM (1987)
    A novel way of programming, which starts with specific details of a particular example and abstracts these details into generalised sets, is proposed. The whole program is constructed around the definition of these sets. ...
  • SPS-ALGOL: Semantic constructs in a persistent programming language 
    Berman, S (1987)
    Persistent data is defined as that which survives on secon­dary store after program execution terminates. In a persistent programming language there is no distinction what ­ever between persistent data and ...
  • Three packaging rules for information systems design 
    Mende, J (1987)
    After identifying the processing functions required in a computer based information system, the designer needs to combine them into an optimal se t of load un its. Some “packaging” arrangements yield a better system than ...
  • Towards a programming environment standard in LISP 
    Mori, R (1987)
    The programming requirements of the Artificial Intelligence ( AI ) community have led to the creation of tools to aid the software development process. One such tool is the programming environment. ...

Search UnisaIR


Browse

My Account