Showing items 1 - 20 of 5905

Your selections:

Price discovery in the cryptocurrency option market : a univariate GARCH approach

- Venter, Pierre J., Mare, Eben, Pindza, Edson

A competency framework for coaches working in coaching development centres

- Slabbert, Bernice, Hoole, Crystal

  • Authors: Slabbert, Bernice , Hoole, Crystal
  • Date: 2021
  • Subjects: Coaching , Competency frameworks , Coaching development centres
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/479143 , uj:43327 , Citation: Slabbert, B., & Hoole, C. (2021). A competency framework for coaches working in coaching development centres. SA Journal of Industrial Psychology/SA Tydskrif vir Bedryfsielkunde, 47(0), a1841. https://doi. org/10.4102/sajip.v47i0.1841 , ISSN: (Online) 2071-0763
  • Description: Abstract: Orientation: Globalisation and the new world of work has changed the labour market, resulting in highly complex, volatile and dynamic environments. Organisations are dependent on highly skilled human capital to not only survive but also thrive. Selecting and developing talent is thus becoming a business necessity. Assessment centres (ACs) and development assessment centres (DACs) have become popular tools to manage talent because of the successful outcomes it provides. In recent years, there has been a noticeable increase in the awareness of the benefits that coaching can offer in the AC environment as well as the development of coaching development centres (CDCs). However, research on CDCs is still limited. For CDCs to provide the same rigorous results as ACs and ADCs, a well-defined competency framework is needed for coaches working in a CDC. Research purpose: The aim of this study was to explore the required competencies and formulate a competency framework for coaches working in a CDC. Motivation for the study: Coaching, which is at the heart of coaching practices such as executive coaching, one-on-one coaching, team coaching and CDCs, requires a clear set of coaching competencies to ensure that it deliver its mandate to its clients: individuals, organisations and the profession. Coaches in a CDC environment work in a different context and require different competencies. A competency framework for CDC specifically is therefore needed. Research approach/design and method: Adopting a qualitative methodology, a self-completed questionnaire was administered to eight participants, followed by a semi-structured interview. Lastly, the competency framework was verified by an expert panel of five experts using the Delphi technique. Main findings: A final competency framework consisting of 25 competencies, of which 14 are considered as core competencies, was validated. Practical/managerial implications: The study contributes to the understanding of the unique behavioural demands associated with coaches operating in the context of a CDC. It provides a conceptual and practical framework of what competencies are needed to work successfully and effectively as a coach in a CDC, and ultimately enhance the effectiveness of a CDC. Contribution/value-add: Utilising this framework in practice will enable us to use candidates best suited to the role of a coach at a CDC, and will enhance the overall success of such centres.
  • Full Text:

A confluence of liminality in a rural learner transitioning to boarding school in South Africa

- Bennett, T., Ramsaroop, S., Petersen, N.

  • Authors: Bennett, T. , Ramsaroop, S. , Petersen, N.
  • Date: 2021
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481550 , uj:43637 , Citation: Bennett, T., Ramsaroop, S. & Petersen, N. 2021. A confluence of liminality in a rural learner transitioning to boarding school in South Africa.
  • Description: Abstract: Many rural children in South Africa are subjected to social isolation, poor quality schooling and other related challenges, which impacts their growth and development and access to post-school educational opportunities. Well-functioning boarding schools offer a solution but research in South Africa is still in its infancy. Using the theoretical frame of liminality, in a qualitative case study, the authors explore the influence of a wellfunctioning boarding school on the social and academic development of a socioeconomically disadvantaged rural male learner. Data from interviews, observations, progress reports and open-ended questionnaires were analysed using content analysis procedures and interpreted for evidence of possible shifts, tensions, and challenges. The findings confirm that while the young man benefitted both academically and socially, the confluence of liminal spaces in his transition from a rural background to boarding school, resulted in ongoing tensions that prolonged his state of liminality. We discuss the consequences for the learner and our roles as researchers and engage with the implications for this type of research for development agents both in South Africa and internationally.
  • Full Text:

A critical review of standards to examine the parameters of Child-Friendly Environment (CFE) in parks and open space of planned neighborhoods : a case of Lucknow City, India

- Agarwal, Mohit Kumar, Sehgal, Vandana, Ogra, Aurobindo

A deep gated recurrent unit based model for wireless intrusion detection system

- Kasongo, Sydney Mambwe, Sun, Yanxia

A dilemma for determination pluralism (or dualism)

- Van der Merwe, Ragnar

  • Authors: Van der Merwe, Ragnar
  • Date: 2021
  • Subjects: Truth , Dualism , Pluralism
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481720 , uj:43658 , Citation: Van der Merwe, R. 2021. A dilemma for determination pluralism (or dualism).
  • Description: Abstract: Douglas Edwards is arguably the most prominent contemporary advocate of moderate alethic pluralism. Significantly influenced by Crispin Wright and Michael Lynch, his work on the nature of truth has become widely discussed in the topical literature. Edwards labels his version of moderate alethic pluralism determination pluralism. At first blush, determination pluralism appears philosophically promising. The position deserves thoughtful consideration, particularly because of its capacity to accommodate the scope problem. I argue, however, that upon analysis the view is better understood as a form of metaphysical dualism or what I will call meta-dualism. Furthermore, determination pluralists face a dilemma; there appears to be an instability at the core of their dualistic model. On the one horn of the dilemma, they need a clear metaphysical demarcation at the interface of their two necessary domains. On the other horn, they seem to need to a metaphysically vague boundary at the interface of their two necessary domains. Determination pluralism needs substantial revision.
  • Full Text:

A double-layer-clustering differential evolution by speciation and self-adaptive strategies for multimodal optimization

- Liu, Qingxue, Du, Shengzhi, Van Wyk, Barend Jacobus, Sun, Yanxia

A fuzzy-based optimization technique for the energy and spectrum efficiencies trade-off in cognitive radio-enabled 5G network

- Khalaf, Osamah Ibrahim, Ogudo, Kingsley A., Singh, Manwinder

A holistic assessment of construction and demolition waste management in the Nigerian construction projects

- Aboginije, Ademilade, Aigbavboa, Clinton, Thwala, Wellington

A metabolomics and molecular networking approach to elucidate the structures of secondary metabolite produced by Serratia marcescens strains

- Clements, Tanya, Rautenbach, Marina, Ndlovu, Thando, Khan, Seeham, Khan, Wesaal

  • Authors: Clements, Tanya , Rautenbach, Marina , Ndlovu, Thando , Khan, Seeham , Khan, Wesaal
  • Date: 2021
  • Subjects: Pigmented and non-pigmented Serratia marcescens , Molecular networking , Prodigiosin
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481202 , uj:43593 , Citation: Clements T, Rautenbach M, Ndlovu T, Khan S and Khan W (2021) A Metabolomics and Molecular Networking Approach to Elucidate the Structures of Secondary Metabolites Produced by Serratia marcescens Strains. Front. Chem. 9:633870. DOI: 10.3389/fchem.2021.633870
  • Description: Abstract: An integrated approach that combines reverse-phase high-performance liquid chromatography (RP-HPLC), electrospray ionization mass spectrometry, untargeted ultra-performance liquid chromatography coupled to tandem mass spectrometry (UPLC-MSE) and molecular networking (using the Global Natural Products Social molecular network platform) was used to elucidate the metabolic profiles and chemical structures of the secondary metabolites produced by pigmented (P1) and non-pigmented (NP1) Serratia marcescens (S. marcescens) strains. Tandem mass spectrometry-based molecular networking guided the structural elucidation of 18 compounds for the P1 strain (including 6 serratamolides, 10 glucosamine derivatives, prodigiosin and serratiochelin A) and 15 compounds for the NP1 strain (including 8 serratamolides, 6 glucosamine derivatives and serratiochelin A) using the MSE fragmentation profiles. The serratamolide homologues were comprised of a peptide moiety of two L-serine residues (cyclic or open-ring) linked to two fatty acid chains (lengths of C10, C12, or C12:1). Moreover, the putative structure of a novel open-ring serratamolide homologue was described. The glucosamine derivative homologues (i.e., N-butylglucosamine ester derivatives) consisted of four residues, including glucose/hexose, valine, a fatty acid chain (lengths of C13 – C17 and varying from saturated to unsaturated) and butyric acid. The putative structures of seven novel glucosamine derivative homologues and one glucosamine derivative congener (containing an oxo-hexanoic acid residue instead of a butyric acid residue) were described. Moreover, seven fractions collected during RPHPLC, with major molecular ions corresponding to prodigiosin, serratamolides (A, B, and C), and glucosamine derivatives (A, C, and E), displayed antimicrobial activity against a clinical Enterococcus faecalis S1 strain using the disc diffusion assay. The minimum inhibitory and bactericidal concentration assays however, revealed that prodigiosin exhibited the greatest antimicrobial potency, followed by glucosamine derivative A and then the serratamolides (A, B, and C)...
  • Full Text:

A multinational comparison of care-leaving policy and legislation

- Strahl, Benjamin, Van Breda, Adrian Du Plessis, Mann-Feder, Varda, Schröer, Wolfgang

A network analysis of the General Health Questionnaire

- Van Zyl, C.J.J.

A new absolute date from Swartkrans Cave for the oldest occurrences of Paranthropus robustus and Oldowan stone tools in South Africa

- Kuman, Kathleen, Granger, Darryl E., Gibbon, Ryan J., Pickering, Travis Rayne, Caruana, Matthew, Bruxelles, Laurent, Clarkee, Ronald J., Heaton, Jason L., Stratford, Dominic, Brain, C. K.

A paradigm shift in Higher Education in the context of the Fourth Industrial Revolution

- Du Preez, J., Sinha, S.

A paradigm shift in higher education in the context of the Fourth Industrial Revolution

- Du Preez, J., Sinha, S.

A pilot study comparing the effects of thinning processes on the cross-sectional morphologies of early from late Acheulian Handaxes

- Caruana, Matthew V.

A pilot-study of the use of nutrition-related Apps and Software in Africa during the COVID-19 pandemic

- Tchuenchieu, Alex, Kesa, Hema, Koufie, Gifty, Onyenweaku, Eridiong O.

  • Authors: Tchuenchieu, Alex , Kesa, Hema , Koufie, Gifty , Onyenweaku, Eridiong O.
  • Date: 2021
  • Subjects: Africa , COVID-19 , Eating Habits
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481113 , uj:43582 , Citation: Tchuenchieu, A. et al. A pilot-study of the use of nutrition-related Apps and Software in Africa during the COVID-19 pandemic.
  • Description: Abstract: The ongoing COVID-19 pandemic and the associated lockdown measures have risen the malnutrition problem in the world, especially in Africa. The use of nutrition apps/software at individual level therefore appears as suitable solution given the context. This study aimed at assessing the actual usage level of nutrition apps/software and the determining factors. A cross-sectional study consisting of an online-survey conducted from April to May 2020 with as target Africans aged of 18 and above was carried out. A total of 460 respondents from different African countries was registered. Globally they appeared to have started using computer and smartphones since at least 5 years and this mostly at a daily frequency together with internet. A total of 52.2 % of the respondents recognized not to apply or not to know if they apply the principles of a balanced diet in their day-to-day life, but just 18% reported to be using a nutrition apps/software; COVID-19 pandemic having pushed 7% to refer more to these tools and 0.7% to start using one. South Africa nationals, people living in a household of 3-5 people and those having a monthly income above 500 USD tended to use them more. Almost half of the users report that these tools do not take into consideration foods available in their context. On the other hand, almost half of the non-users (41.5% of respondents) said they would prefer to be advised by a dietician. However up to 50.9% clearly stated they are interested in learning more about these tools, which is of quite of big interest in preventing Non-communicable diseases resurgence in relation to COVID-19 pandemic.
  • Full Text:

A policy approach towards achieving regional economic re-silience in developing countries : evidence from the SADC

- Pretorius, Ockert, Drewes, Ernst, Van Aswegen, Mariske, Malan, Gerard

  • Authors: Pretorius, Ockert , Drewes, Ernst , Van Aswegen, Mariske , Malan, Gerard
  • Date: 2021
  • Subjects: Economic resilience , Regional policy , Regional integration
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/481314 , uj:43608 , Citation: Pretorius, O. et al. 2021. A policy approach towards achieving regional economic re-silience in developing countries : evidence from the SADC.
  • Description: Abstract: External economic shocks such as the global financial crisis (GFC) affect regional economic growth in developing regions through impacting export demand and capital inflows. Resilience to these economic shocks—i.e. the ability to recover from the initial impact and prolonged effects of said shocks—is influenced by the inherent vulnerability of regional economies to their impact. The research objective is to investigate regional economic resilience policy in the context of the Southern African Development Community (SADC), and the wider perspective of trading blocs among de-veloping countries. Central hereto is undertaking an equilibrium and econometric analysis to iden-tify endogenous and exogenous factors of the regional economy that influence economic resilience. Analysis findings indicate that economic openness, export market dynamics and sectoral composi-tion may influence economic resilience. SADC vulnerability may be attributed to the dependence on foreign direct investment (FDI) inflows and exports to higher-income markets, relatively low import tariffs and the comparative importance of tertiary activities to output. A balanced regional policy approach is required: one focused on industrialization, while incorporating elements to sup-port economic resilience. The latter includes increased intra-regional trade anchored in the devel-opment of regional supply and value chains which support primary sector activities, and capaci-tated supranational institutions to oversee regional integration initiatives.
  • Full Text:

A robust technique for detecting glaucoma from fundus

- Afolabi, Oluwatobi J., Nelwamondo, Fulufhelo V., Mabuza-Hocket, Gugulethu P., Paul, Babu S.

  • Authors: Afolabi, Oluwatobi J. , Nelwamondo, Fulufhelo V. , Mabuza-Hocket, Gugulethu P. , Paul, Babu S.
  • Date: 2021
  • Subjects: Fundus image , Glaucoma , Segmentation
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/478568 , uj:43255 , Citation: Afolabi, O.J. et al. A robust technique for detecting glaucoma from fundus.
  • Description: Abstract: Glaucoma has been credited to be the foremost cause of preventable loss of sight in the world second only to cataract. Its effect on the eye is usually irreversible and can only be prevented by early detection. In this paper, we developed a glaucoma detection technique. This technique includes a modified U-net model and an extreme gradient boost (XGB) algorithm. The modified U-net model was utilized to segment both the optic cup and the optic disc from the fundus images. The extreme gradient boost algorithm was utilized to analyze extracted features from segmented optic cups and discs and hence detect glaucoma. The modified U-net model was both trained and tested on the DRIONS, DRISHTI-GS, RIM-ONE-V2 and the RIM-ONE-V3 databases. When tested for optic disc segmentation on the four databases, the model achieved the following average dice-scores: 0.96 on RIM-ONE-V3, 0.97 on RIM-ONE-V2, 0.96 on DRIONS, and 0.97 on DRISHTI-GS. The XGB algorithm achieved an accuracy of 88 % and an AUC-ROC of 92.9 % in detecting glaucoma from the segmented optic disc and optic cup. The proposed glaucoma detection technique achieves a state-of-the-art accuracy and useful for observing structural changes in optic cup and optic disc. The advantage of the proposed modified U-net model is that it has much fewer parameters to be trained when compared to the original U-net model and hence faster training time and cheaper training cost.
  • Full Text:

A survey on classification algorithms of brain images in Alzheimer’s disease based on feature extraction techniques

- Hazarika, Ruhul Amin, Maji, Arnab Kumar, Sur, Samarendra Nath, Paul, Babu Sena, Kandar, Debdatta

  • Authors: Hazarika, Ruhul Amin , Maji, Arnab Kumar , Sur, Samarendra Nath , Paul, Babu Sena , Kandar, Debdatta
  • Date: 2021
  • Subjects: Alzheimer’s Disease (AD) , Hippocampus , Magnetic Resonance Imaging (MRI)
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/476430 , uj:43014 , Citation: Hazarika, R.A. et al. 2021. A survey on classification algorithms of brain images in Alzheimer’s disease based on feature extraction techniques.
  • Description: Abstract: Alzheimer’s disease (AD) is one of the most serious neurological disorders for elderly people. AD affected patient experiences severe memory loss. One of the main reasons for memory loss in AD patients is atrophy in the hippocampus, amygdala, etc. Due to the enormous growth of AD patients and the paucity of proper diagnostic tools, detection and classification of AD are considered as a challenging research area. Before a Cognitively normal (CN) person develops symptoms of AD, he may pass through an intermediate stage, commonly known as Mild Cognitive Impairment (MCI). MCI is having two stages, namely StableMCI (SMCI) and Progressive MCI (PMCI). In SMCI, a patient remains stable, whereas, in the case of PMCI, a person gradually develops few symptoms of AD. Several research works are in progress on the detection and classification of AD based on changes in the brain. In this paper, we have analyzed few existing state-of-art works for AD detection and classification, based on different feature extraction approaches. We have summarized the existing research articles with detailed observations. We have also compared the performance and research issues in each of the feature extraction mechanisms and observed that the AD classification using the wavelet transform-based feature extraction approaches might achieve convincing results.
  • Full Text:
  • Disclaimer
  • Privacy
  • Copyright
  • Contact