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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  • Universal decremental redundancy compression with fountain codes 
    Luus, Francois Pierre Sarel; McDonald, A.; Maharaj, Bodhaswar Tikanath Jugpershad (South African Institute of Electrical Engineers, 2010-06)
    A new universal noise-robust lossless compression algorithm based on a decremental redundancy approach with fountain codes is proposed. The binary entropy code is harnessed to compress complex sources with the addition of ...
  • Photonic transitions (1.4 eV–2.8 eV) in silicon p(+) np(+) injection-avalanche CMOS LEDs as function of depletion layer profiling and defect engineering 
    Snyman, Lukas Willem; Du Plessis, Monuko; Bellotti, Enrico (Institute of Electrical and Electronics Engineers, 2010-06)
    p+ np+ CMOS Si LED structures were modeled in order to investigate the effect of various depletion layer profiles and defect engineering on the photonic transitions in the 1.4–2.8 eV, 450–750 nm regime. Modeling shows that ...
  • Geometric steady states of nonlinear systems 
    Xia, Xiaohua; Zhang, Jiangfeng (Institute of Electrical and Electronics Engineers, 2010-06)
    The analytic concept of steady states for nonlinear systems was introduced by Isidori and Byrnes, and its geometric properties were also given implicitly mixed with the solvability of the output regulation problem for ...
  • Super-orthogonal block codes with multichannel equalisation and OFDM in frequency selective fading 
    Sokoya, O.; Maharaj, Bodhaswar Tikanath Jugpershad (Hindawi Publishing Corporation, 2010-06)
    Super-orthogonal block codes in space-time domain (i.e., Super-orthogonal space-time trellis codes (SOSTTCs)) were initially designed for frequency nonselective (FNS) channels but in frequency selective (FS) channels these ...
  • High-gain dual-polarised planar slot array for WLAN applications 
    Joubert, Johan; Odendaal, J.W. (Johann Wilhelm); Prinsloo, J. (Institution of Engineering and Technology, 2010-07)
    A high-gain dual-polarised planar etched slot array for use in wireless local area networks (WLAN) is presented. Two sets of four collinear slots are used as radiators for each polarisation. Each set of four collinear ...
  • Automatic detection of African elephant (Loxodonta africana) infrasonic vocalisations from recordings 
    Venter, Pieter J.; Hanekom, Johannes Jurgens (Elsevier, 2010-07)
    Recordings of elephant vocalisations can be used to determine the size and composition of the herd, the sexual state, as well as the emotional condition of an elephant. Manual analysis of recordings (by listening to these ...
  • An elliptically flared waveguide horn 
    Malherbe, J.A.G., 1940-; Katcodia, Y. (Wiley, 2010-09)
    An X-band waveguide horn of which the sides flare by an elliptic function is described. Measurements performed show that the structure exhibits an absence of side lobes in the conventional sense, and that the radiation ...
  • Opportunities and challenges of wireless sensor networks in smart grid 
    Gungor, Vehbi Cagri; Lu, Bin; Hancke, Gerhard P. (Institute of Electrical and Electronics Engineers, 2010-10)
    The collaborative and low-cost nature of wireless sensor networks (WSNs) brings significant advantages over traditional communication technologies used in today’s electric power systems. Recently, WSNs have been widely ...
  • Optimal hoist scheduling of a deep level mine twin rock winder system for demand side management 
    Badenhorst, Werner; Zhang, Jiangfeng; Xia, Xiaohua (Elsevier, 2011)
    This paper presents a near optimal hoist scheduling and control program for rock winders found in South African deep level mines in the context of demand side management and time-of-use (TOU) tariffs. The objective is to ...
  • Actor coordination using info-gap decision theory in wireless sensor and actor networks 
    Chinnappen-Rimer, Suvendi; Hancke, Gerhard P. (Inderscience, 2011)
    Mobile, unmanned, power and resource-rich devices, called actors, deployed within a Wireless Sensor Network (WSN) application area, enable faster response times to events. Due to cost constraints, only a few actors can ...
  • Elliptically shaped quad-ridge horn antennas as feed for a reflector 
    Jacobs, Ockert Botha; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Institute of Electrical and Electronics Engineers, 2011)
    Quad-ridge horn antennas of various geometries are considered as possible candidates for a wideband reflector antenna feed. It is demonstrated that shaping the sidewalls of the ridge horns significantly improves the ...
  • Tolerance analysis of cross-eye jamming systems 
    Du Plessis, W.P. (Warren Paul); Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Institute of Electrical and Electronics Engineers (IEEE), 2011-01)
    The matching required between the two directions through a retrodirective cross-eye jammer is considered using both the traditional phase-front analysis and an extended analysis. The design parameters to achieve a specified ...
  • Experimental simulation of retrodirective cross-eye jamming 
    Du Plessis, W.P. (Warren Paul); Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Aerospace & Electronic Systems Society, 2011-01)
    Experimental measurements that accurately simulate the effect of a retrodirective cross-eye jammer on a monopulse radar are described. The accuracy of a recently published extended analysis of retrodirective cross-eye ...
  • The performance of different synthesis signals in acoustic models of cochlear implants 
    Strydom, Trudie; Hanekom, Johannes Jurgens (Acoustical Society of America, 2011-02)
    Synthesis (carrier) signals in acoustic models embody assumptions about perception of auditory electric stimulation. This study compared speech intelligibility of consonants and vowels processed through a set of nine ...
  • Pseudo-elliptic bandpass filter with subharmonic stubs 
    Malherbe, J.A.G., 1940- (Institution of Engineering and Technology, 2011-02)
    A simple bandpass filter that approximates equal ripples in both the pass band and the stopband is described. The filter comprises two stubs, resonant at one-half and one-quarter of the centre frequency, respectively, and ...
  • A model predictive control approach to the periodic implementation of the solutions of the optimal dynamic resource allocation problem 
    Zhang, Jiangfeng; Xia, Xiaohua (Elsevier, 2011-02)
    This paper proposes a model predictive control (MPC) approach to the periodic implementation of the optimal solutions of a class of resource allocation problems in which the allocation requirements and conditions repeat ...
  • On identifiability of nonlinear ODE models and applications in viral dynamics 
    Miao, Hongyu; Xia, Xiaohua; Perelson, Alan S.; Wu, Hulin (Society for Industrial and Applied Mathematics, 2011-02-08)
    Ordinary differential equations (ODEs) are a powerful tool for modeling dynamic processes with wide applications in a variety of scientific fields. Over the last two decades, ODEs have also emerged as a prevailing tool ...
  • Modeling and energy efficiency optimization of belt conveyors 
    Zhang, Shirong; Xia, Xiaohua (Elsevier, 2011-03)
    The improvement of the energy efficiency of belt conveyor systems can be achieved at equipment and operation levels. Specifically, variable speed control, an equipment level intervention, is recommended to improve operation ...
  • An analysis of the effects of electrical field interaction with an acoustic model of cochlear implants 
    Strydom, Trudie; Hanekom, Johannes Jurgens (Acoustical Society of America, 2011-04)
    Electrical field interaction caused by current spread in a cochlear implant was modeled in an explicit way in an acoustic model (the SPREAD model) presented to six listeners with normal hearing. The typical processing ...
  • Modelling, validation, and control of an industrial fuel gas blending system 
    Muller, Cornelius Jacobus; Craig, Ian Keith; Ricker, N.L. (Elsevier, 2011-04)
    In industrial fuel gas preparation, several compositional properties must be controlled within specified limits. This allows client plants to burn the gas safely and with consistent heat production. The variables to be ...