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

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

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  • Tweedimensionele generatorfunksie vir die vektorkardiogram vir gebruik in volumegeleidingsmodelle van die toraks 
    Geldenhuys, T.A.; Joubert, M.; Viljoen, Suretha; Hanekom, Tania (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 ...
  • Analitiese tegniek om die foneemherkenningsvermoë van Suid-Afrikaanse kogleêre inplantinggebruikers te bepaal 
    Pretorius, Linda Luise; Hanekom, 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 ...
  • 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, D.J.E. (Daniel Jacobus Elardus); 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.J. (Charl 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 ...
  • 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 ...
  • A modelling methodology for natural dam-river network systems 
    Zhuan, Xiangtao T.; 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, ...
  • 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, Tanya Heather; Hanekom, 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, Leonard; 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 ...
  • HIV dynamics : analysis and robust multirate MPC-based treatment schedules 
    Elaiw, A.M.; Xia, Xiaohua (Elsevier, 2009)
    Analysis and control of human immunodeficiency virus (HIV) infection have attracted the interests of mathematicians and control engineers during the recent years. Several mathematical models exist and adequately explain ...
  • Improving land cover class separation using an extended Kalman filter on MODIS NDVI time-series data 
    Kleynhans, Waldo; Olivier, Jan Corne; Wessels, K.J. (Konrad); Van den Bergh, Frans; Salmon, Brian Paxton; Steenkamp, Karen C. (Institute of Electrical and Electronics Engineers, 2009)
    It is proposed that the normalized difference vegetation index time series derived from Moderate Resolution Imaging Spectroradiometer satellite data can be modeled as a triply (mean, phase, and amplitude) modulated cosine ...
  • Dual-band dual-polarized array for WLAN applications 
    Steyn, J.M.; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (EMW Publishing, 2009)
    This paper presents a dual-band dual-polarized antenna array design for WLAN applications. Four double-dipole elements are orthogonally interleaved to facilitate operation in both the standard WLAN frequency bands (IEEE ...
  • Gaussian process modeling of CPW-FED slot antennas 
    De Villiers, Johan Pieter; Jacobs, Jan Pieter (EMW Publishing, 2009)
    Gaussian process (GP) regression is proposed as a structured supervised learning alternative to neural networks for the modeling of CPW-fed slot antenna input characteristics. A Gaussian process is a stochastic process ...
  • Comparison of two routing metrics in OLSR on a grid based mesh network 
    Johnson, David; Hancke, Gerhard P. (Elsevier, 2009-03)
    Predicting the performance of ad hoc networking protocols for mesh networks has typically been performed by making use of software based simulation tools. Experimental study and validation of such predictions is a vital ...