Browsing Faculty of Engineering by Title

Warm-start heuristics for solving the passive optical network planning problem

Luies, Ruan; Terblanche, Stephanus; Grobler, Magdalena (Univ Stellenbosch, 2018)

The use of automated network planning systems is crucial for reducing the deployment cost and planning time of passive optical telecommunication networks. Mixed integer linear programming is well suited for the purpose of ...

Waste butter and margarine as feedstock for biodiesel production

Schabort, C.J.; Visser, H.P.; Hartzenberg, A.; Venter, R.; Marx, S. (ETA-Florence Renewable Energies, 2012)

The resulting bio-waste from butter and margarine factories should be disposed of in an environmentally friendly manner. Currently the bio-waste is either flushed into the municipal sewerage system or moved to landfill ...

Water-only laboratory coal fractionation using the reflux classifier

Campbell, Q.P.; Le Roux, M.; Smith, I.G.T. (Elsevier, 2015)

Due to health and environmental factors involved with standard float-sink analytical methods, a water-only fractionation procedure was investigated. A laboratory scale 105 × 105 mm reflux classifier was built and used to ...

Where is the power of the IEEE 1459-2010?

Rens, Johan; Van Rooyen, Tian; De Jager, Francois (IEEE, 2014)

The integration of the IEEE 1459-2010 power definitions with the IEC 61000-4-30 PQ standard is investigated. A Class A PQ instrument, which record network coherent data with an absolute time uncertainty of less than 100 ...

White space and digital dividends: the case for dynamic spectrum access in South Africa

Ferreira, Melvin; Helberg, Albert (IEEE, 2011)

In this paper we present the current state of affairs surrounding the analog switch-off and corresponding digital dividend as pertaining to South Africa. Analog switch-off and digital dividends has enjoyed much attention ...

Wing-body circulation control by means of a fuselage trailing edge

Huyssen, R.J.; Spedding, G.R.; Mathews, E.H.; Liebenberg, L. (American Institute of Aeronautics & Astronatics, 2012)

Ideal flight sheds the least amount of kinetic energy into a wake while imparting momentum sufficient to balance the vehicle weight. This combination defines a unique downwash distribution for the wake, which an aircraft ...

A wireless sensor network testbed for the evaluation of energy-aware routing schemes

Grobler, Magdalena J.; Marais, Henri-Jean; Krige, Joubert G.J. (Sage, 2014)

Wireless sensor networks (WSNs) are receiving a lot of research attention due to continual improvement in the technologies used by these networks. The energy efficiency of sensor nodes and the network as a whole is of ...

Woefzela - an open-source platform for ASR data collection in the developing world

de Vries, Nic J.; Badenhorst, Jaco; Davel, Marelie H.; Barnard, Etienne; de Waal, Alta (Interspeech 2011, 2011)

Building transcribed speech corpora for under-resourced languages plays a pivotal role in developing speech technologies for such languages. We have developed an open-source tool for devices running the Android operating ...

Wolof Speech Recognition Model of Digits and Limited-Vocabulary Based on HMM and ToolKit

Tamgno, James K.; Barnard, Etienne; Lishou, Claude; Richomme, Morgan (Computer Modelling and Simulation (UKSim), 2012 UKSim 14th International Conference on, 2012)

This paper is concerned with Automatic Speech Recognition (ASR) using trainable systems. The aim of this work is to build acoustic models for spoken language Wolof. This is done by employing Hidden Markov Models (HMM) and ...

X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals

Everson, Raymond C.; Okolo, Gregory N.; Neomagus, Hein W.J.P.; Dos Santos, Jaen-Mari (Elsevier, 2013)

An investigation was undertaken to determine the effect of carbon structural properties on the reactivity of chars derived from inertinite-rich coal. The structures of chars were characterized by X-ray diffraction and ...