- A-Z Publications
- Ergonomics SA : Journal of the Ergonomics Society of South Africa
- Previous Issues
- Volume 26, Issue 2, 2014
Ergonomics SA : Journal of the Ergonomics Society of South Africa - Volume 26, Issue 2, 2014
Volume 26, Issue 2, 2014
Source: Ergonomics SA : Journal of the Ergonomics Society of South Africa 26 (2014)More Less
I recently came upon the idea of "academic citizenship" which encompasses those tasks which are often in tension with career-advancing work, such as preparing manuscripts for publication, and securing funding. Citizenship in this sense is the act of engaging with academic pursuits so that the very world of academe might continue to thrive. Reviewing draft manuscripts, editing submissions, peer-reviewing theses at Masters or PhD level are arduous tasks which are poorly remunerated if at all and do not contribute directly to career advancement goals. These are fundamental tasks and it is worth pondering the nature of our own contribution as "citizens" of academe, perhaps even challenging our peers to make this a point of focus in 2015.
Comparisons of muscular activity in males and females while walking in restricted postures, Ergonomics SA, 25 (1) 2013, pp. 39-51 : corrigendumSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 26 (2014)More Less
Important health and safety performance improvement indicators for small & medium construction enterprises in South Africa : eliciting expert opinion using the Delphi TechniqueSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 26, pp 3 –22 (2014)More Less
This study sought to identify and validate a comprehensive set of health and safety (H&S) elements and leading indicator metrics, in an industry where there has been an over-reliance of lagging indicators such as accident rates and workers compensation in monitoring H&S performance improvement. The Delphi approach was used to elicit the opinion of H&S experts on 64 H&S potential leading indicator metrics. The metrics were categorized in 10 H&S elements that were considered essential to improve H&S performance. Sixteen experts completed all four iterative rounds of Delphi and rated each indicator on a 10-point Likert-type scale of importance, where 1=unimportant and 10=very important. Consensus of the indicator metrics was reached when measures attracted final scores of; median 9 to 10 and more than 50% of respondents rating the indicator between 9 and 10. Forty-eight indicator metrics were retained after four successive rounds of Delphi. The limitation was; reliance of a structured questionnaire survey in the first round of Delphi as experts were not allowed to add any new indicators, until the fourth round. This study contributes to the H&S body of knowledge where no consensus has been reached pertaining to important H&S culture leading indicator metrics for monitoring H&S performance in construction small and medium enterprises (SMEs) at project level in South Africa.
Source: Ergonomics SA : Journal of the Ergonomics Society of South Africa 26, pp 23 –38 (2014)More Less
Low back pain has become one of the most influential musculoskeletal disorders of modern society. Exercise has been shown to be very effective in the treatment of chronic low back pain. The goal of the study was to test the effect of two exercise intervention programmes (conservative or progressive-aggressive programmes) for 12 weeks on low back muscle strength as well as psychological factors in participants with chronic low back pain. In total 32 participants were recruited for the study and randomly assigned to two exercise groups. However, due to medical and work related reasons a number of subjects dropped out. At the end there were 10 subjects in the conservative exercise group and 11 in the progressive-aggressive group. Statistically significant differences at the 5% level of significance were found at the post-test measurements between the two groups. The results from the present study indicate that both types of programmes have shown to be very effective in the treatment of chronic low back pain, but that an aggressive-progressive exercise programme may be slightly more effective than a more conservative exercises programme.
Source: Ergonomics SA : Journal of the Ergonomics Society of South Africa 26, pp 39 –49 (2014)More Less
The changes in users' Web search performance using search engines over ten years was investigated in this study. Matched data obtained from samples in 2000 and 2010 were used for the comparative analysis. The patterns of Web search engine use suggested a dominance in using a particular search engine. Statistical comparisons for performance measures (i.e. time, number of steps, satisfaction, and accuracy) were taken. Since users' exposure to Web search engines had increased significantly in the intervening years, Web experience was used as a covariate for the two primary search performance measures (time and steps). The results indicated that the 2010 sample had improved significantly across all performance measures with the exception of satisfaction. In contrast to expectations, Web experience did not act as a covariate in the majority of instances and so it is likely that improvements in search performance were due to technical developments of Web search engines and the increasing size of the Web.
Source: Ergonomics SA : Journal of the Ergonomics Society of South Africa 26, pp 50 –66 (2014)More Less
The changes in users' mental models of Web search engines over ten years were investigated in this study. Matched data obtained from samples in 2000 and 2010 were used for the comparative analysis. Ward's Cluster analyses including the Pseudo T2 Statistical analyses were used to determine the mental model clusters for the seventeen salient design features of Web search engines at each time point. The cubic clustering criterion (CCC) and the dendogram were conducted for each sample to help determine the number of clusters to interpret. The results indicated that the cluster formations for the 2000 sample differed from those of the 2010 sample. The detailed analyses of the salient features demonstrated that the accuracy and completeness of users' mental models of Web search engines had improved slightly from 2000 to 2010. The analyses conducted indicate that users' mental models of Web search engines still remain largely inaccurate and incomplete, but may have aligned more closely with designers' conceptualisations.