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Browsing Research Articles (Electrical, Electronic & Computer Engineering) by Issue Date

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Browsing Research Articles (Electrical, Electronic & Computer Engineering) by Issue Date

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  • Chaos synchronization of the fractional Lü system
    Deng, D.H.; Li, C.P. (Elsevier, 2005-08)
    Chaos synchronization of the fractional Lü system is theoretically and numerically studied by two methods. The suitable conditions for achieving synchronization of this fractional differential system are derived by using ...
  • Generalized projective synchronization of a unified chaotic system
    Yan, J.; Li, C.P. (Elsevier, 2005-11)
    In the present paper, a simple but efficient control technique of the generalized projective synchronization is applied to a unified chaotic system. Numerical simulations show that this method works very well, which can ...
  • Polynomial Gaussian beams and topological charge conservation
    Roux, Filippus S. (Elsevier, 2006)
    We investigate polynomial Gaussian beams with rotationally symmetric Gaussian envelops and complex bivariate polynomial prefactors of finite order. A formalism for the propagation of such beams is developed, which expresses ...
  • Tweedimensionele generatorfunksie vir die vektorkardiogram vir gebruik in volumegeleidingsmodelle van die toraks
    Hanekom, Tania; Viljoen, Suretha; Joubert, M.; Geldenhuys, T.A. (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2006-09)
    An electrocardiogram (ECG) measures the electrical activity of the heart on the surface of the skin. Volume conduction models of the thorax can be designed to simulate such measurements. However, to drive such simulations ...
  • Ultrawideband as an industrial wireless solution
    Hancke, Gerhard P.; Allen, B. (IEEE, 2006-10)
    Ultrawideband wireless technology is capable of transmitting data at very high rates, over a wide frequency spectrum, with very low power consumption. UWB also offers precision location positioning and tracking, significantly ...
  • Analitiese tegniek om die foneemherkenningsvermoë van Suid-Afrikaanse kogleêre inplantinggebruikers te bepaal
    Pretorius, L.L.; Hanekom, J.J. (Johannes Jurgens); Van Wieringen, A.; Wouters, J. (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2006-12)
    This article describes analytical tests developed to investigate the extent to which Afrikaans- and Englishspeaking South African cochlear implant users recognize phonemes. Vowel stimuli (in a /?VOWEL t/ context) and ...
  • Frequency offset estimation for GSM and EDGE
    Olivier, Jan Corne (Elsevier, 2007-01)
    A low complexity method for estimating the frequency offset in global system mobile (GSM) and enhanced data rates for GSM evolution (EDGE) is proposed. The method is based on minimising a suitable least squares (LS) metric ...
  • Get valuable information from the data graveyard
    Bauer, M. (Southern African Institute for Industrial Engineering, 2007-05)
    Continuous measurements such as temperature, pressure, or flow are recorded and stored in the plant data history of industrial chemical plants. Frequently, data is accumulated and kept in storage without anyone drawing ...
  • Scalable and energy efficient localisation in wireless sensor networks
    Erasmus, Daniel J.E.; Hancke, Gerhard P. (Computer Society of South Africa, 2007-12)
    A need exists for localisation algorithms in Wireless Sensor Networks (WSNs) that are scalable, energy efficient and able to function in easy to deploy sensor networks. This paper proposes a beaconless Cluster-based Radial ...
  • SEER : a simple energy efficient routing protocol for wireless sensor networks
    Hancke, Gerhard P.; Leuschner, C. Jaco (Computer Society of South Africa, 2007-12)
    The nature of wireless sensor networks necessitates specific design requirements, of which energy efficiency is paramount. In this paper we present SEER (Simple Energy Efficient Routing), a novel routing protocol for ...
  • A modelling methodology for natural dam-river network systems
    Zhuan, X.; Zheng, G.; Xia, Xiaohua (Elsevier, 2008)
    An approach for modeling a natural dam-river network systems is proposed in this paper. Generally, the relationship among the variables of a natural dam-river network system are complex and difficult to describe. In this ...
  • A low-cost open-hardware wideband multiple-input–multiple-output (MIMO) wireless channel sounder
    Maharaj, Bodhaswar Tikanath Jugpershad; Wallace, Jon W.; Jensen, Michael A.; Linde, Louis P. (Institute of Electrical and Electronics Engineers, 2008)
    Due to the complexity of multiple-input–multipleoutput (MIMO) wireless channels, direct measurement is the main viable option for accurate characterization. Details on a new low-cost wideband channel sounder are presented, ...
  • An XML model for use across heterogeneous client–server applications
    Chinnappen-Rimer, Suvendi; Hancke, Gerhard P. (Institute of Electrical and Electronics Engineers, 2008)
    Applications that use directory services or relational databases operate in a client–server model, where a client requests information from a server, and the server returns a response to the client. These client–server ...
  • Improved BDFE using a priori information for turbo equalization
    Wu, Jingxian; Leong, Sang-Yick; Lee, Kah-Ping; Xiao, Chengshan; Olivier, Jan Corne (Institute of Electrical and Electronics Engineers, 2008-01)
    Turbo equalization improves communication system performance by iteratively exchanging information between soft-input soft-output (SISO) equalizer and SISO channel decoder. The trellis-based maximum a posteriori robability ...
  • Speaker-specific variability of phoneme durations
    Van Heerden, C.J.; Barnard, E. (Computer Society of South Africa, 2008-06)
    The durations of phonemes varies for different speakers. To this end, the correlations between phonemes across different speakers are studied and a novel approach to predict unknown phoneme durations from the values of ...
  • Predicting action potential characteristics of human auditory nerve fibres through modification of the Hodgkin–Huxley equations
    Smit, J.E.; Hanekom, Tania; Hanekom, J.J. (Johannes Jurgens) (Academy of Science of South Africa, 2008-07)
    In 1952, Hodgkin and Huxley published an empirical set of equations describing changes in the neural membrane potential of the squid giant axon during the application of depolarizing or hyperpolarizing stimuli. As these ...
  • Improving the security of chaotic synchronization with a ∆-modulated cryptographic technique
    Liang, Xiyin; Zhang, Jiangfeng; Xia, Xiaohua (IEEE, 2008-07)
    A secure chaos-based communication with a ∆-modulated chaotic cryptographic technique is developed in this paper. We prove that a ∆-modulated feedback control of a 1-D discrete-time control system gives rise to a chaotic ...
  • Adaptive synchronization for generalized Lorenz systems
    Liang, Xiyin; Zhang, Jiangfeng; Xia, Xiaohua (Institute of Electrical and Electronics Engineers, 2008-08)
    In literature it is conjectured that the states of the generalized Lorenz system with an unknown parameter can not be estimated by adaptive observers. In this paper we show that this unknown parameter and the states can ...
  • Performance of a quasi-synchronous four-dimensional super-orthogonal WCDMA modulator for next generation wireless applications
    Linde, Louis P.; Staphorst, L.; Vlok, J.D. (Academy of Science of South Africa, 2008-11)
    This paper presents the bit-error-rate (BER) performance of an upwards-expandable spectral and power efficient quasi-synchronous multi-layer-modulated (MLM) four-dimensional super-orthogonal wideband code-division multiple ...
  • Semi-global finite-time observers for nonlinear systems
    Shen, Yanjun; Xia, Xiaohua (Elsevier, 2008-12)
    It is well known that high gain observers exist for single output nonlinear systems that are uniformly observable and globally Lipschitzian. Under the same conditions, we show that these systems admit semi-global and ...

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