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SUNScholar Research Repository

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  • Adaptive estimation of speech parameters 
    Basson J.A.L., du Preez J.A. (IEEE, 1994)
    Linear predictive coding (LPC), and transformations of it, is currently the most popular way of analysing speech signals. Major limitations of using a frame-based technique are that each frame is analysed in isolation of ...
  • Adaptive unstructured remeshing using gradient-only optimisation algorithms for shape optimisation 
    Wilke D.N.   Kok S.   Groenwold A.A. (2006)
    In this 'work-in-progress' paper, we show how gradient-only optimization algorithms can effectively be used for optimization problems characterized by noise and discontinuities; an example of such a function being the ...
  • A distributed scheme for value-based bandwidth reconfiguration 
    Arvidsson A.   Gobel J.   Krzesinski A.   Taylor P. (2009)
    This paper presents a scheme for reallocating bandwidth in path-oriented transport networks. At random time points, bandwidth is allocated to those paths that (possibly temporarily) value it most highly. The scheme acts ...
  • Advances in catalytic chain transfer polymerisation mediated by cobaloximes 
    Sanderson R.D.   Makawa-Mbewe J.   De Kock J.J. (2001)
    Catalytic chain transfer copolymerisation of MMA and HEMA (70:30) has been carried out under semi-continuous emulsion polymerisation conditions, using CoBF as catalyst. It has been shown that macromonomers of low molar ...
  • Advances in the design of Jaumann absorbers 
    du Toit L.J.   Cloete J.H. (1990)
    The authors consider electric screens with the material spacers assumed homogeneous, nonmagnetic, lossless, commensurate, and isotropic. Normal incidence is assumed. Such an N-layered structure may be modeled as a transmission ...
  • Advantages of strict (Tygerberg) criteria for evaluation of-sperm morphology 
    Menkveld R.   Kruger T.F. (1995)
    The purpose of this paper was to compare the validity of strict criteria for sperm morphology evaluation with other evaluation criteria in the diagnosis and prognosis of male fertility potential. Adoption of strict criteria ...
  • Affirming a role for specialised dictionaries in indigenous African languages 
    Nkomo D. (2010)
    One of the main problems facing speakers and language practitioners of indigenous African languages is the shortage of appropriate dictionaries for a variety of purposes. This lack results in users consulting any available ...
  • A flying capacitor multilevel inverter with bootstrap-powered MOSFET gate drive circuits 
    Molepo S.A.   Mouton H.D.T. (2002)
    The problem of non-technical power loss due to theft of electricity experienced in developing countries is of great concern. This is done mainly by tapping of the overhead AC reticulation networks and bypassing of metering ...
  • African experience with training courses on sperm examination 
    Franken D.R.   Aneck-Hahn N. (2008)
    In conjunction with the World Health Organization's Department of Health and Research, the Department of Obstetrics and University of Stellenbosch, South Africa presented since 1997 hands-on semenology workshops for 87 ...
  • A GPS based time-stamping and scheduling system for wide area power system measurements 
    Van As M.T.S.   Vermeulen H.J. (2002)
    This paper describes a synchronising and scheduling system for wide area synchronised data acquisition applications and fault location in power systems, using Global Positioning System (GPS) technology. The system hardware ...
  • A graph-theoretic proof of the non-existence of self-orthogonal Latin squares of order 6 
    Burger A.P.   Kidd M.P.   Van Vuuren J.H. (2011)
    The non-existence of a pair of mutually orthogonal Latin squares of order six is a well-known result in the theory of combinatorial designs. It was conjectured by Euler in 1782 and was first proved by Tarry in 1900 by means ...
  • A hardware emulator testbed for software defined radio 
    Witkowsky J.   Van Rooyen G.-J. (2002)
    In software defined radio (SDR), most of the traditionally analogue signal processing, synthesis and analysis functions of a communications system are performed digitally. However, critical hardware system components (such ...
  • A high energy-resolution zero degree facility for (p,p′) and (p,t) reactions 
    Neveling R.   Fujita H.   Smit F.D.   Adachi T.   Berg G.P.A.   Buthelezi E.Z.   Carter J.   Conradie J.L.   Couder M.   Fearick R.W.   Fortsch S.V.   Fourie D.   Fujita Y.   Gorres J.   Hatanaka K.   Heilmann A.M.   Mira J.P.   Murray S.H.T.   Von Neumann-Cosel P.   O'Brien S.   Papka P.   Poltoratska I.   Richter A.   Sideras-Haddad E.   Swartz J.A.   Tamii A.   Usman I.T.   Van Zyl J.J. (2011)
  • A landscape with objects: Private game reserves, game lodges and the 'New Safari' 
    Green L. (2010)
    This paper investigates the proliferation of high-end private game reserves in Africa as the manifestation of an emerging economic but also symbolic and emotional investment in the value of nature. Increasing concern for ...
  • Algorithms for high order hidden Markov modelling 
    du Preez J.A. (1997)
    We detail an algorithm that transforms any higher order hidden Markov model (HMM) to an equivalent first order HMM. This makes it possible to process higher order HMMs with standard techniques applicable to first order ...
  • Ambiguity of unary symmetric difference NFAs 
    Van Der Merwe B.   Van Zijl L.   Geldenhuys J. (2011)
    Okhotin [9] showed an exponential trade-off in the conversion from nondeterministic unary finite automata to unambiguous nondeterministic unary finite automata. In this paper, we consider the trade-off in the case of unary ...
  • A mechanism for zinc toxicity in neuroblastoma cells 
    Daniels W.M.U.   Hendricks J.   Salie R.   Van Rensburg S.J. (2004)
    Zinc is an important component of proteins essential for normal functioning of the brain. However, it has been shown in vitro that this metal, at elevated levels, can be toxic to cells leading to their death. We investigated ...
  • A method to determine the performance characteristics of cooling tower spray zones 
    Reuter H.C.R.   Viljoen D.J.   Kroger D.G. (2010)
    Cooling tower spray zones play an important role in cooling tower performance. Ideally they must distribute the cooling water uniformly onto the fill and must produce small drops at minimal pressure head to maximise heat ...
  • Amino acid supplementation, controlled oxygen limitation and sequential double induction improves heterologous xylanase production by Pichia stipitis 
    Gorgens J.F.   Passoth V.   Van Zyl W.H.   Knoetze J.H.   Hahn-Hagerdal B. (2005)
    Heterologous endo-β-1,4-xylanase was produced by Pichia stipitis under control of the hypoxia-inducible PsADH2-promoter in a high-cell-density culture. After promoter induction by a shift to oxygen limitation, different ...
  • An AC-to-AC converter based voltage regulator 
    Van Schalkwyk C.   Beukes H.J.   Du T Mouton H. (2002)
    This paper presents an AC voltage regulator based on a pulse width modulated AC-to-AC converter and a step-down transformer. The regulator is aimed at electrification of small rural communities and compensates for the ...