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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; ...
  • Claessens, R; De Waal, A; De Villiers, Pieter; Penders, A; Pavlin, G; Tuyls, K (SCITEPRESS, 2016-04)
    The range of applications that require processing of temporally and spatially distributed sensory data is expanding. Common challenges in domains with these characteristics are sound reasoning about uncertain phenomena and ...
  • 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 ...
  • Rademeyer, E; Van der Walt, Christiaan M; De Waal, A (IEEE, 2016-12)
    This paper investigates the performance of two-class classification credit scoring data sets with low default ratios. The standard two-class parametric Gaussian and non-parametric Parzen classifiers are extended, using ...
  • 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 ...