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Now showing items 1-20 of 21

    • Combining speed and acceleration to detect reckless driving in the informal public transport industry 

      Zeeman, A. S.; Booysen, Marthinus J. (IEEE -- Institute of Electrical and Electronics Engineers, 2013-10)
      The informal transport industry in Sub-Saharan Africa is notoriously dangerous, leading to many fatalities annually. This paper presents an innovative way of monitoring driver behaviour, in real-time, by taking into ...

    • Compact high-power broadband absorptive filters using slotted waveguide harmonic pads 

      Stander, Tinus; Meyer, Petrie; Van der Walt, Pieter Willem (The Institution of Engineering and Technology - IET, 2014-06)
      A compact high-power broadband absorptive filter is designed by cascading a slotted waveguide harmonic pad with a wide stop-band reflective filter. Absorption is achieved by coupling a surface current standing wave to ...

    • Constant radiation characteristics for log-periodic dipole array antennas 

      Lehmensiek, Robert; De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2014)
      Given the correct terminal voltages on each element of a log-periodic dipole array constant radiation characteristics can be achieved for an omni-directional radiation pattern. In this communication it is shown that this ...

    • Etched ring absorbing waveguide filter based on a slotted waveguide antenna response 

      Stander, Tinus; Meyer, Petrie (Wiley, 2008-04)
      A cascade of resistively loaded etched rings in waveguide is proposed to act as the load in a balanced FMCW Reflected Power Canceller topology using a slotted waveguide array antenna. A synthesis technique using derived ...

    • Fast parametric modeling of radio astronomy reflector antenna noise temperature 

      De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2016)
      This communication presents an approximate method to rapidly estimate the antenna noise temperature of a reflector antenna system as a function of the geometric parameters describing the reflector dishes. The initial ...

    • Household electricity and water monitor and control with cellular communications and web interface 

      Muller, R. I.; Booysen, Marthinus J. (IEEE -- Institute of Electrical and Electronics Engineers, 2014-01)
      The availability and depletion of natural resources is increasingly punted as the limiting factor for sustainability. A lot of focus is currently placed on the role and effect of fossil fuels as well as water conservation. ...

    • Impact of Neighbor Awareness at the MAC Layer in a Vehicular Ad-hoc NETwork (VANET) 

      Booysen, Marthinus J.; Zeadally, Sherali; Van Rooyen, Gert-Jan (IEEE -- Institute of Electrical and Electronics Engineers, 2013-06)
      Despite various proposed Medium Access Control (MAC) approaches, efficient medium access in VANET remains a significant challenge, especially for the broadcast of safety messages. A key contributing factor to packet ...

    • Informal public transport in Sub-Saharan Africa as a vessel for novel intelligent transport systems 

      Booysen, Marthinus J.; Andersen, S. J.; Zeeman, A. S. (IEEE -- Institute of Electrical and Electronics Engineers, 2013-10)
      Developed countries have lead the way in the implementation of Intelligent Transport Systems, with the objectives of improving safety, efficiency, and environmental impact of transport. With the developing world entering ...

    • Left ventricular segmentation from MRI datasets with edge modelling conditional random fields 

      Dreijer, Janto F.; Herbst, Ben M.; Du Preez, Johan A. (BioMed Central, 2013-07)
      Background: This paper considers automatic segmentation of the left cardiac ventricle in short axis magnetic resonance images. Various aspects, such as the presence of papillary muscles near the endocardium border, makes ...

    • Machine-to-machine (M2M) communications in vehicular networks 

      Booysen, Marthinus J.; Gilmore, J. S.; Zeadally, Sherali; Van Rooyen, Gert-Jan (Korea Society of Internet Information (KSII), 2012-02)
      To address the need for autonomous control of remote and distributed mobile systems, Machine-to-Machine (M2M) communications are rapidly gaining attention from both academia and industry. M2M communications have recently ...

    • Minibus driving behaviour on the Cape Town to Mthatha Route 

      Booysen, Marthinus J.; Ebot, N. A.; Akpa, E. N. O. (Southern African Transport Conference, 2014-07)
      Minibus taxis are considered to be notoriously dangerous and are seen as the epitome of bad driving in South Africa in particular, and Sub-Saharan Africa in general. Minibus taxis are used for long-distance and urban travel. ...

    • Modeling of the radiation pattern of a pair of thin circular-arc dipoles over an infinite ground plane 

      De Villiers, Dirk I. L.; Lehmensiek, Robert (Institute of Electrical and Electronics Engineers, 2013)
      This communication presents a model of the radiation pattern of two circular-arc dipoles above an infinite perfectly electrically conducting ground plane. A Fourier expansion is used to describe the currents on the wires, ...

    • Parametric modeling of radiation patterns and scattering parameters of antennas 

      Mutonkole, Ngoy; Samuel, Elizabeth Rita; De Villiers, Dirk I. L.; Dhaene, Tom (Institute of Electrical and Electronics Engineers, 2016)
      This paper describes a data-driven method to model the radiation patterns (over a large angular region) and scattering parameters of antennas as a function of the geometry of the antenna. The radiation pattern model consists ...

    • A performance comparison of media access control protocols for vehicular ad-hoc networks (VANETs) 

      Booysen, Marthinus J.; Zeadally, Sherali; Van Rooyen, Gert-Jan (The Institution of Engineering and Technology (IET), 2012-04)
      The emergence of computationally rich vehicles and recent advances in wireless communication technologies are fueling vehicular network research in industry and academia. A key challenge to the successful deployment of ...

    • Public transport sector driver behaviour : measuring recklessness using speed and acceleration 

      Zeeman, Adriaan Siebrits; Booysen, Marthinus J. (Southern African Transport Conference, 2014-07)
      The informal transport industry in Sub-Saharan Africa is notoriously dangerous, leading to many fatalities annually. This paper presents an innovative way of monitoring driver behaviour, in real-time, by taking into account ...

    • Rapid calculation of antenna noise temperature in offset Gregorian reflector systems 

      De Villiers, Dirk I. L.; Lehmensiek, Robert (Institute of Electrical and Electronics Engineers, 2015)
      Antenna noise temperature calculations of reflector systems is often a slow process and makes direct optimization of the sensitivity of these systems a difficult and time consuming task. This paper presents an improvement ...

    • The relevance of Intelligent Transport Systems (ITS) in sub-sub-Saharan Africa 

      Booysen, Marthinus J. (Development Bank of Southern Africa, 2013-07)
      Countries like the United States, Japan, and a number of countries in Europe, have led the way in a field that has become known as Intelligent Transportation Systems. The term broadly describes any intelligent intervention ...

    • Remotely controllable wireless road stud network 

      Le Roux, J. H.; Barnard, A.; Booysen, Marthinus J. (IEEE -- Institute of Electrical and Electronics Engineers, 2013-10)
      Developing countries face many infrastructure related challenges, one of them being road safety. This paper proposes a novel system introducing a network of wirelessly connected road studs that are remotely controllable ...

    • Simple capacitive seat sensing for occupancy detection and passenger counting in minibus taxis 

      Zeeman, Adriaan Siebrits; Booysen, Marthinus J. (Southern African Transport Conference, 2014-07)
      The informal public transportation sector in Sub-Saharan Africa contributes significantly to public transport, and yet little is known about passenger mobility patterns. We propose a low cost system to measure occupancy ...

    • Survey of Media Access Control (MAC) protocols for Vehicular Ad hoc NETworks (VANETs) 

      Booysen, Marthinus J.; Zeadally, Sherali; Van Rooyen, Gert-Jan (The Institution of Engineering and Technology (IET), 2011-07)
      Recent advances of various wireless communication technologies and the emergence of computationally rich vehicles are pushing Vehicular Ad-hoc NETwork (VANET) research to the forefront in academia and industry. A lot of ...