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Browsing by Author "De Waal, A"

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  • Willers, CJ; Willers, MS; De Waal, A (Society of Photo-Optical Instrumentation Engineers (SPIE), 2014-09)
    Infrared missiles pose a significant threat to civilian and military aviation. ManPADS missiles are especially dangerous in the hands of rogue and undisciplined forces. Yet, not all the launched missiles hit their targets; ...
  • De Wet, Febe; De Waal, A; Van Huyssteen, GB (The International Speech Communication Association, 2011-08)
    Afrikaans is one of the eleven official languages of South Africa. It is classified as an under-resourced language. No annotated broadband speech corpora currently exist for Afrikaans. This article reports on the development ...
  • De Waal, A; Barnard, E (PRASA 2008, 2008-11)
    Topic models are unsupervised techniques that extract likely topics from text corpora, by creating probabilistic word-topic and topic-document associations. Evaluation of topic models is a challenge because (a) topic models ...
  • Koen, Hildegarde; De Villiers, Johan P; Roodt, H; De Waal, A (Elsevier, 2017-03)
    A significant challenge in ecological modelling is the lack of complete sets of high-quality data. This is especially true in the rhino poaching problem where data is incomplete. Although there are many poaching attacks, ...
  • Koen, H; De Villiers, JP; Pavlin, G; De Waal, A; De Oude, P; Mignet, F (2014-07)
    Rhino poaching in South Africa is leading to a catastrophic reduction in the rhino population. In this paper a Bayesian network causal model is proposed to model the underlying (causal) relationships that lead to rhino ...
  • De Waal, A; Barnard, E (PRASA 2010, 2010-11)
    Topic models explain a collection of documents with a small set of distributions over terms. These distributions over terms define the topics. Topic models ignore the structure of documents and use a bag-of-words approach ...
  • Johnson, S; Mengersen, K; De Waal, A; Marnewick, K; Cilliers, D; Houser, AM; Boast, L (Elsevier, 2010-02)
    Relocation is one of the strategies used by conservationists to deal with problem cheetahs in southern Africa. The success of a relocation event and the factors that influence it within the broader context of long-term ...
  • Plauché, M; De Waal, A; Sharma Grover, A; Gumede, T (University of Southern California, Annenberg School for Communication & Journalism, 2010)
    Successful ICT projects depend on complex, interrelated sociological and technical factors for which there are no standard theoretical framework for prediction or analysis. Morphological analysis is a problem-solving method ...
  • Claessens, R; De Waal, A; De Villiers, P; Penders, A; Pavlin, G; Tuyls, K (2015-05)
    The proposed framework for Multi-Agent Target Tracking supports i) tracking of objects and ii) search and rescue based on the fusion of very heterogeneous data. The system is based on a novel approach to fusing sensory ...
  • De Waal, A (Pattern Recognition Association of South Africa, 2012-11)
    These proceedings list all peer reviewed papers delivered at the twenty-third annual symposium of the Pattern Recognition Association of South Africa, held in Pretoria in November 2012
  • Willers, CJ; Willers, MS; Santos, RAT; Van der Merwe, PJ; Calitz, JC; De Waal, A; Mudau, AE (SPIE Digital library, 2012-09)
    Electro-optical system design, data analysis and modelling involve a significant amount of calculation and processing. Many of these calculations are of a repetitive and general nature, suitable for including in a generic ...
  • Badenhorst, J; De Waal, A; De Wet, Febe (2012-05)
    The collection of speech data suitable for speech technology development is a challenge for under-resourced languages. Factors such as cost, availability of mother-tongue speakers and vast geographic distances call for ...
  • De Vries, NJ; Davel, MH; Badenhorst, J; Basson, WD; De Wet, Febe; Barnard, E; De Waal, A (Elsevier, 2014-01)
    Acoustic data collection for automatic speech recognition (ASR) purposes is a particularly challenging task when working with under resourced languages, many of which are found in the developing world. We provide a brief ...
  • Venter, JP; De Waal, A; Willers, N (SpringerLink.com, 2007-01)
    Forensic analysis requires a keen detective mind, but the human mind has neither the ability nor the time to process the millions of bytes on a typical computer hard disk. Digital forensic investigators need powerful tools ...
  • De Waal, A; Mouton, F (IEEE Xplore, 2013-11)
    In this paper the authors provide context to Topic Modelling as an Information Warfare technique. Topic modelling is a technique that discovers latent topics in unstructured and unlabelled collection of documents. The topic ...
  • De Villiers, J Pieter; Jousselme, A-L; De Waal, A; Pavlink, G; Laskeyz, K; Blasch, E; Costa, P (IEEE, 2016-07)
    In this paper, the principle taxonomy of the fusion process, the decision loop, is unified with uncertainty quantification and representation. A typical flow of information in the decision loop takes the form of raw ...
  • De Waal, A; Willers, CJ; Roodt, JHS; Mudau, AE (INCOSE South Africa, 2013-08)
    A commonly-used term in the simulation domain is ‘validation, verification and accreditation’ (VVA). When analysing simulation predictions for the purpose of system solution development and decision-making, one key question ...
  • De Vries, NJ; Badenhorst, J; Davel, MH; Barnard, E; De Waal, A (Conference paper, 2011-08)
    Building transcribed speech corpora for under-resourced languages plays a pivotal role in developing speech technologies for such languages. The authors have developed an open-source tool for devices running the Android ...