1989 5th South African Computer Symposium: Recent submissions

  • Proceedings of the 5th/Vth Southern African Computer Symposium, Holiday Inn, Sandton, 29 November - 1 December 1989 (Full book) 
    Kritzinger, P. (Ed.) (SAICS (South African Institute of Computer Scientists), 1989-11-29)
  • Integrated network management 
    Roos, J.D. Von Backström, L. (SAICS, 1989-11-29)
    Over the last decade, networks have evolved into sophisticated, multi-vendor, multi-protocol networks, which need to be properly managed and protected. The preferred way of accomplishing this, is through Integrated Network ...
  • A protocol engineering workstation - with an application to protocol performance analysis 
    Kritzinger, P.S. Wheeler, G. (SAICS, 1989-11-29)
    This paper describes the Protocol Engineering Workstation (PEW), an integrated specification, debugging and testing package based upon the Estelle FDT. It consists of three primary integrated components: a screen editor, ...
  • Predicting the performance of shared multiprocessor caches 
    Goosen, H.A. Cheriton, D.R. (SAICS, 1989-11-29)
    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 ...
  • Structuring hypertext 
    Barrow, J. (SAICS, 1989-11-29)
    With the many new opportunities for text-handling created by the associative form of hypertext come the possible user problems of disorientation, high cognitive load, and low precision access. The possibility of dynamic ...
  • A systematic method for synthesis of asynchronous machines using Interface Protocol Asynchronous Cell (IPAC) PAL device 
    Aghdasi, F. (SAICS, 1989-11-29)
    A novel method of designing asynchronous sequential circuits is introduced which lends itself to implementation by edge sensitive flip-flops in a manner that edge sensitive inputs and level sensitive signals can be combined. ...
  • Towards a general cell silicon compiler 
    Moosa, M.S. Levy, D.C. (SAICS, 1989-11-29)
    This paper provides an overview of a general cell silicon compiler being developed at the University of Natal. The individual components, together with their motivation, are presented. No attempt is made to provide explicit ...
  • A comparison of assignment and matching lower bounds for the symmetric travelling salesman problem 
    Smith, T.H.C. Meyer, T.W.S. (SAICS, 1989-11-29)
    Improved lower bounds for the Euclidean travelling salesman problem, based on the assignment relaxation, have previously been presented. We present computational experience which indicates that the (continuous) 2-matching ...
  • The representation of chemical structures by using structure graph grammars 
    Ehlers, E.M. Von Solms, S.H. Tew, A.W. (SAICS, 1989-11-29)
    The use of graph grammars in modeling three dimensional structures is discussed. Two extensions of graph grammars are proposed. Structure graph grammars generate three dimensional structure graphs. The representation of ...
  • Generalized product form solutions for multiserver centres with concurrent classes of customers 
    Krzesinski, A.E. Crosby, S. (SAICS, 1989-11-29)
    The MultiServer centre with Concurrent Classes of Customers (MSCCC) is a service centre consisting of B parallel identical exponential servers. The customers requesting service at the MSCCC centre belong to K classes. ...
  • Generalized product form solutions for multiserver centres with concurrent classes of customers 
    Krzesinski, A.E. Crosby, S. (SAICS, 1989-11-29)
    The MultiServer centre with Concurrent Classes of Customers (MSCCC) is a service centre consisting of B parallel identical exponential servers. The customers requesting service at the MSCCC centre belong to K classes. ...
  • A model for conceptual views of a task realm 
    Short, R.C.M. (SAICS, 1989-11-29)
    An earlier article in this journal argued the case for the developers of an information system, for a particular task realm, to begin the development with the determination of the conceptual views of that realm held by the ...
  • A multi-criteria partitioning technique for information system design 
    Mende, J. (SAICS, 1989-11-29)
    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, ...
  • A methodology for the management of end-user computing 
    Eloff, J.H.P. Eloff, M.M. (SAICS, 1989-11-29)
    End-user computing is becoming an issue of strategic importance in the computer industry today. We have seen many organizations implementing end-user computing according to the guidelines as included in conventional software ...
  • Query processing in NRDNIX 
    Lamprechts, S. (SAICS, 1989-11-29)
    NRDNIX is a distributed database management system (DDBMS) under implementation on a network of powerful personal computers. Several design aspects influence the query processing strategy followed in NRDNIX. These design ...
  • Relational database triggers 
    Rennhackkamp, M. (SAICS, 1989-11-29)
    A database procedure, also named a trigger, is a powerful procedural construct. It forms part of the database definition and is stored in a compiled form for efficient execution. A trigger mechanism consists of actions to ...
  • Finding regular paths in acyclic graphs 
    Wood, P.T. (SAICS, 1989-11-29)
    Increasing the expressive power of relational query languages by providing some form of recursion is currently a topic of much research. For many recursive queries in relational databases, a relation can be represented as ...
  • Persistent sets - an alternative to relational databases 
    Berman, S. (SAICS, 1989-11-29)
    Persistent programming languages, which extend conventional languages to treat database data as well, are becoming viable alternatives to Database Management Systems. However, they are currently lacking in one essential ...
  • Database consistency under UNIX 
    Viktor, H.L. (SAICS, 1989-11-29)
    A recovery technique to facilitate the recovery from system failures should ensure a consistent database state at all times. The UNIX write system call uses a delayed-write policy. Data blocks are kept in a buffer cache ...
  • A file server for a multi-transputer UNIX system 
    Hoffman, K. Smit, G. de V. (SAICS, 1989-11-29)
    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, ...

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