1995 SAICSIT 95 Research and Development Symposium
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Papers Delivered at the SAICSIT 95 Research and Development Symposium (South African Institute for Computer Scientists and Information Technologists), Film Auditorium, University of South Africa, Pretoria, 25-26 May1995, edited by A.L. Steenkamp (UNISA) (ISBN 0-86981-909-7).
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Item An overview of the Internet services available in South Africa(1995) Radovanovic, A; Venter, DM; Steenkamp, A.L.South African networking history started in the mid 1980's. Within less than ten years, the country became the 15-th fastest growing network within the lnternet community. Today, the South African network offers a variety of services on more than 20,000 Internet servers. The new information retrieval tools, as well as the new networking technologies, has pushed research towards a South African version of the "Information Superhighway".Item Rank-one update of Cholesky factorization(1995) Ntlatlapa, N; Steenkamp, A.L.Symmetric positive definite matrices appear in most methods for Unconstrained Optimization. The method widely adopted for factoring these matrices is Cholesky Factorization. Furthermore, in Quassi-Newton methods for unconstrained optimization these matrices are continually updated and factorized. Here we consider factoring an n x n symmetric positive definite matrix of the form: A' = A + CXZZT , where A is symmetric positive definite, a is a scalar and z is a vector of length n. We assume that A has already been factorized by Cholesky factorization. The adopted methods are due to Gill et. al. [GGS75, GM72].Item The design of a 2D non-linear filter for digital image processing(1995) Cloete, E; Steenkamp, A.L.A 1 D non-linear filter which is based on 'max-min' selectors is extended for use in 2 0 applications. The objective of this research is to remove impulsive noise without unduly changing original, valid data. Some examples are presented to indicate the use of this new filter as a pre-filter for detecting dense regions of images.Item Higraphs: an overview of theory and application(1995) Hillebrand, G; Steenkamp, A.L.This paper presents an overview of the established concepts of David Harel' s higraphs, to increase their visibility. Higraphs are a union of extended graph and extended set theory which allows the understandable definition of complex semantics, having a powerful intuitive cognitive nature. Viewing 'the big picture' is cited as an example of this understandability. A number of other applications of higraphs are given. Some novel applications are suggested, including the use of higraphs in analyzing business processes, graphical user interface specification, graph domain specification and executable graphs, A proposition is made that process graphs and data-entity state-transition higraphs are duals. Finally, a case is made for 'informal' higraphs in group communications.Item An organisational model for simplifying the complexity of managing software project(1995) Zellouf, M; Prevot, P; Aubry, R; Steenkamp, A.L.The project success depends to a large degree on communication and coordination among team members. But project management systems and models do not support cooperative group work. Their basic philosophy is rather hierarchical and centralistic. It is the intention of this paper to present an Organisational Model for simplifying the complexity of managing software project, both at software project modelling aspect and the aspect of communication and coordination among project team members. In particular, it focuses on the following points: an activity is the main component of project management, the constraints between activities and resources must be established. A role defines a group of duties and responsibilities. The activity related communication proceeds by the exchange of products between roles. While the constraints coordinate the products flow between roles. The benefit of the practical use of the model is to reduce the coordination effort required of project team members, and thus to increase the productivity in software development project.