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1987 4th Southern African Computer Symposium
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Browsing 1987 4th Southern African Computer Symposium by Issue Date

Browsing 1987 4th Southern African Computer Symposium by Issue Date

Now showing items 1-20 of 24

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 ...
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 ...
The design and use of a Prolog trace generator for CSP

Kourie, DG (1987)

The role of traces in the context of formal description techniques is discussed, as well as issues arising in the generation of these traces by means of software. A trace generator (written in Prolog) for systems described ...
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 ...
The ELSIM language: an FSM-based language for the ELSIM SEE

Du Plessis, L; Borman, C (1987)

A formal requirements specification language, the ELSIM language, is presented. The language uses conceptual models for modelling data processing, and control characteristics and behaviour of real-time systems, and is ...
Ada for multi-microprocessors: some problems and solutions

Bishop, JM (1987)

This paper looks at ways of obtaining a distributed version of an Ada program. Since current approaches require a large investment in system software, we propose instead the use of an Adapter, which can be a manual methodology ...
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 ...
An approach to direct end-user usage of multiple databases

Philips, MJ (1987)

The difficulties encountered by users without experience of the use of multiple databases are described, as well as an approach which allow such users to make worthwhile use of these systems, encompassing potentially ...
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 ...
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. ...
An extensible system and a programming tool for workstation computers

Wirth, N (1987)
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 ...
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 ...
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 ...
The development of a software fault tolerant system for a real time control environment

Morris, MA (1987)

Difference equation methods are used to develop redundant (n-version) programs required for high reliability computing systems. The n-version programs are developed by exploiting the iterative nature of real time software. The ...
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. ...
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 ...
An approximate solution method for multiclass queueing networks with state dependent routing and window flow control

Krzesinski, AE (1987)

A Multidass Queueing Network (MQN) Q ( N, .M ) consisting of M centres with index set .M and population vector N is partitioned into two subnetworks Q ( fJ -V , .M -1) ) and Q (V , V ) . The centres in Q (V , · V ) are ...
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 ...

Browsing 1987 4th Southern African Computer Symposium by Issue Date

Browsing 1987 4th Southern African Computer Symposium by Issue Date

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