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Browsing South African Computer Journal (SACJ) by Issue Date

Browsing South African Computer Journal (SACJ) by Issue Date

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  • On the generation of permutations 
    Naccache de Paz, D (South African Institute of Computer Scientists and Information Technologists, 1990)
    A new incremental algorithm for generating permutations on 1,2,..n (hereafter called "arrangements') is presented. The scheme generates arrangement k +1 by reversing a certain prefix of its predecessor and linking it to ...
  • Data structuring via functions 
    Venter, BH (South African Institute of Computer Scientists and Information Technologists, 1990)
    A programming language data model is introduced, based on the notions that variables are functions and types are sets of values. It is shown that, despite the simplicity of the underlying mathematical formalism, the data ...
  • Review of mapping neural networks in classification systems 
    Hing, RL (South African Institute of Computer Scientists and Information Technologists, 1990)
    An old approach used in classification systems has been revived by the discovery of new algorithms which use this approach to approximate complex non-linear functions. This approach, known as neurocomputing, classifies ...
  • A file server for a multi-transputer UNIX system 
    Hoffman, PK; Smit, G de V (South African Institute of Computer Scientists and Information Technologists, 1990)
    The DISTRIX operating system is a multiprocessor UNIX-like distributed operating system. It consists of a number of satellite processors connected to central servers. The system is based on the MINIX operating system, ...
  • Data-dependence of semantic information 
    Heidema, J; Labuschagne, W.A. (South African Institute of Computer Scientists and Information Technologists, 1990)
    The theory of semantic information is sketched in an algebraic setting, and automorphisms characterising various degrees of incompatibility are introduced. Data-dependent measures of semantic information are defined in ...
  • The fixpoint theorem in the El-Calculus 
    Postma, SW; McGee, A (South African Institute of Computer Scientists and Information Technologists, 1990)
    The οr.1-calculus is presented as an extension to the standard 1-calculus, and a r.1-term called the strong conditional is discussed. The strong conditional is shown to be non-monotomic, and an extension is made to the ...
  • Kritiese faktore vir die suksesvolle afhandeling van inligtingstelselprojekte 
    Bruwer, P.J.S. (South African Institute of Computer Scientists and Information Technologists, 1990)
    During the past 30 years the rapid evolution and distribution of information systems have brought about a change in the issues surrounding information systems projects. The technical, internal and external environment ...
  • An exploratory study into communications between IS staff and users during requirement specification 
    Du Plessis, CJ; Rip, SDE; Lay, PMQ (South African Institute of Computer Scientists and Information Technologists, 1990)
    Communication between IS staff and users during requirement specification is unavoidable. However, little research has been conducted to explore the relationship between effective group communication and the quality of the ...
  • MINIX for a distributed database system 
    Meumann, MD; Rennhackkamp, MH (South African Institute of Computer Scientists and Information Technologists, 1990)
    A user of a distributed database management system must be able to access data which is stored on a number of different sites, connected by a network, without being aware of the physical data distribution. The NRDNIX ...
  • A review of the use of computers in education in South Africa Part 1: Primary and High schools 
    Fallick, PM; Pistorius, MC (South African Institute of Computer Scientists and Information Technologists, 1990)
    This informal review is based on personal discussions carried out within the last year with various experts in the field as to the current use of computers in primary and secondary schools. An attempt has been made to ...
  • A design environment for semantic data models 
    Kambanis, J. (South African Institute of Computer Scientists and Information Technologists, 1990)
    This paper describes the functionality and architecture of a Semantic Data Modeling environment. It integrates User Interface techniques used in Computer Aided Software Engineering-and Expert Systems shells into a system ...
  • The NRDNIX distributed database management system 
    Rennhackkamp, MH (South African Institute of Computer Scientists and Information Technologists, 1990)
    A distributed database management system must facilitate integrated processing of data which is physically distributed over a network of node computers, while providing locality transparency. The NRDNIX prototype has ...
  • The use of a lattice for fast pattern matching 
    Oosthuizen, GD (South African Institute of Computer Scientists and Information Technologists, 1990)
    Pattern recognition involves the matching of a given pattern against a collection of patterns in store in order to identify the given pattern as belonging to a particular class already known to the system or not. Similarly, ...
  • Predicting the performance of shared multiprocessor caches 
    Goosen, HA; Cheriton, DR (South African Institute of Computer Scientists and Information Technologists, 1990)
    We investigate the performance of shared caches in a shared-memory multiprocessor executing parallel programs, and formulate simple models for estimating the load placed on the bus by such a shared cache. We·analyze three ...
  • A multi-criteria partitioning technique for information system design 
    Mende, J. (South African Institute of Computer Scientists and Information Technologists, 1990)
    In order to design and operate a complex computer based information system, one needs to partition its transformation process into modules of manageable size. The same process can be partitioned in many different ways, ...
  • Four major success criteria for information system design 
    Mende, J. (South African Institute of Computer Scientists and Information Technologists, 1990)
    Both in the advancement of Information Systems theory and in practical development projects, significant errors of omission can occur unless one is aware of all aspects of the concept "information system success". At least ...
  • Image reconstruction via the Hartley transform 
    Murrell, HC; Carson, D (South African Institute of Computer Scientists and Information Technologists, 1990)
    The continuous and discrete Hartley transforms are real valued transforms that have similar properties to the continuous and discrete Fourier transforms. In addition, a fast algorithm exists for computing the discrete ...
  • Homological transfer: an informations systems research method 
    Mende, J. (South African Institute of Computer Scientists and Information Technologists, 1990)
    Information systems are members of a large class of similar systems called "productive processes". The existence of similarities between manufacturing, financial, educational, informational and other productive processes ...
  • OCTOLISP: An experiment with data structures 
    Dempster, Robert (South African Institute of Computer Scientists and Information Technologists, 1990)
    OCTOLISP is a functional programming language which provides the programmer with a number of explicit data structures, such as lists, stacks, vectors, sets, trees and forests. Each of these data structures also has a ...
  • A review of the use of computers in education in South Africa: Tertiary education 
    Pistorius, MC; Fallick, PM (South African Institute of Computer Scientists and Information Technologists, 1990)
    This informal review is based on personal discussions carried out within the last year with various experts in the field on the current use of computers in tertiary education, particularly at universities. An attempt has ...

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