A study of the summarizing strategies used by ESL first year science students at the University of Botswana
- Authors: Chimbganda, Ambrose Bruce
- Date: 2007
- Subjects: English language -- Study and teaching (Foreign speakers) -- Botswana English language -- Study and teaching (Higher) -- Botswana Science -- Study and teaching (Higher) -- Botswana Language and education -- Botswana College students -- Botswana -- Language
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2341 , http://hdl.handle.net/10962/d1002623
- Description: One of the major problems faced by speakers of English as a second language (ESL) or non-native speakers of English (NNS) is that when they go to college or university, they find themselves without sufficient academic literacy skills to enable them to navigate their learning successfully, such as the ability to summarize textual material. This thesis examines the summarizing strategies used by ESL first year science students at the University of Botswana. Using multiple data collection methods, otherwise known as triangulation or pluralistic research, which is a combination of quantitative and qualitative methods, one hundred and twenty randomly sampled students completed questionnaires and summarized a scientific text. In order to observe the students more closely, nine students (3 high-, 3 average- and 3 low-proficiency) were purposively selected from the sample and wrote a further summary. The nine students were later interviewed in order to find out from them the kinds of strategies they had used in summarizing the texts. To obtain systematic data, the summaries and the taped interview were coded and analyzed using a hybrid scoring classification previously used by other researchers. The results from the Likert type of questionnaire suggest that the ESL first year science students are 'aware' of the appropriate reading, production and self-assessment strategies to use when summarizing. However, when the data from the questionnaire were cross-checked against the strategies they had used in the actual summarization of the text, most of their claims, especially those of the low-proficiency students, were not sustained. As a whole, the results show that high-proficiency students produce more accurate idea units and are more capable of generalizing ideas than low-proficiency students who prefer to "cut and paste" ideas. There are also significant differences between high- and low proficiency students in the manner in which they decode the text: low-proficiency students produce more distortions in their summaries than high-proficiency students who generally give accurate information. Similarly, high-proficiency students are able to sort out global ideas from a labyrinth of localized ideas, unlike average- and low-proficiency students who include trivial information. The same trend is observed with paraphrasing and sentence combinations: high-proficiency students are generally able to recast and coordinate their ideas, unlike low-proficiency students who produce run-on ideas. In terms of the discrete cognitive and meta-cognitive skills preferred by students, low proficiency students are noticeably unable to exploit pre-summarizing cognitive strategies such as discriminating, selecting, note-making, grouping, inferring meanings of new words and using synonyms to convey the intended meanings. There are also greater differences between high- and low-proficiency students when it comes to the use of meta-cognitive strategies. Unlike high-proficiency students who use their reservoir of meta-cognitive skills such as self-judgment, low-proficiency students ostensibly find it difficult to direct their summaries to the demands of the task and are unable to check the accuracy of their summaries. The findings also show that some of the high-proficiency students and many average- and low-proficiency students distort idea units, find it difficult to use their own words and cannot distinguish between main and supporting details. This resulted in the production of circuitous summaries that often failed to capture the gist of the argument. The way the students processed the main ideas also reveals an inherent weakness: most students of different proficiency levels were unable to combine ideas from different paragraphs to produce a coherent text. Not surprising, then, there were too many long summaries produced by both high- and low-proficiency students. To tackle some of the problems related to summarization, pre-reading strategies can be taught, which activate relevant prior knowledge, so that the learning of new knowledge can be facilitated. During the reading process students can become more meta-cognitively aware by monitoring their level of understanding of the text by using, for example, the strategy suggested by Schraw (1998) of "stop, read and think". Text analysis can also be used to help the students identify the main themes or macro-propositions in a text, and hence gain a more global perspective of the content, which is important for selecting the main ideas in a text. A particularly useful approach to fostering a deeper understanding of content is to use a form of reciprocal or peer-mediated teaching, in which students in pairs can articulate to each other their understanding of the main ideas expressed in the text. As part of the solution to the problems faced by students when processing information, we need to take Sewlall's (2000: 170) advice that there should be "a paradigm shift in the learning philosophy from content-based to an emphasis on the acquisition of skills". In this regard, both content and ESL teachers need to train their students in the explicit use of summarizing strategies, and to plan interwoven lessons and learning activities that develop the learners' intellectual ways of dealing with different learning problems so that they can make learning quicker, easier, more effective and exciting.
- Full Text:
- Date Issued: 2007
- Authors: Chimbganda, Ambrose Bruce
- Date: 2007
- Subjects: English language -- Study and teaching (Foreign speakers) -- Botswana English language -- Study and teaching (Higher) -- Botswana Science -- Study and teaching (Higher) -- Botswana Language and education -- Botswana College students -- Botswana -- Language
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2341 , http://hdl.handle.net/10962/d1002623
- Description: One of the major problems faced by speakers of English as a second language (ESL) or non-native speakers of English (NNS) is that when they go to college or university, they find themselves without sufficient academic literacy skills to enable them to navigate their learning successfully, such as the ability to summarize textual material. This thesis examines the summarizing strategies used by ESL first year science students at the University of Botswana. Using multiple data collection methods, otherwise known as triangulation or pluralistic research, which is a combination of quantitative and qualitative methods, one hundred and twenty randomly sampled students completed questionnaires and summarized a scientific text. In order to observe the students more closely, nine students (3 high-, 3 average- and 3 low-proficiency) were purposively selected from the sample and wrote a further summary. The nine students were later interviewed in order to find out from them the kinds of strategies they had used in summarizing the texts. To obtain systematic data, the summaries and the taped interview were coded and analyzed using a hybrid scoring classification previously used by other researchers. The results from the Likert type of questionnaire suggest that the ESL first year science students are 'aware' of the appropriate reading, production and self-assessment strategies to use when summarizing. However, when the data from the questionnaire were cross-checked against the strategies they had used in the actual summarization of the text, most of their claims, especially those of the low-proficiency students, were not sustained. As a whole, the results show that high-proficiency students produce more accurate idea units and are more capable of generalizing ideas than low-proficiency students who prefer to "cut and paste" ideas. There are also significant differences between high- and low proficiency students in the manner in which they decode the text: low-proficiency students produce more distortions in their summaries than high-proficiency students who generally give accurate information. Similarly, high-proficiency students are able to sort out global ideas from a labyrinth of localized ideas, unlike average- and low-proficiency students who include trivial information. The same trend is observed with paraphrasing and sentence combinations: high-proficiency students are generally able to recast and coordinate their ideas, unlike low-proficiency students who produce run-on ideas. In terms of the discrete cognitive and meta-cognitive skills preferred by students, low proficiency students are noticeably unable to exploit pre-summarizing cognitive strategies such as discriminating, selecting, note-making, grouping, inferring meanings of new words and using synonyms to convey the intended meanings. There are also greater differences between high- and low-proficiency students when it comes to the use of meta-cognitive strategies. Unlike high-proficiency students who use their reservoir of meta-cognitive skills such as self-judgment, low-proficiency students ostensibly find it difficult to direct their summaries to the demands of the task and are unable to check the accuracy of their summaries. The findings also show that some of the high-proficiency students and many average- and low-proficiency students distort idea units, find it difficult to use their own words and cannot distinguish between main and supporting details. This resulted in the production of circuitous summaries that often failed to capture the gist of the argument. The way the students processed the main ideas also reveals an inherent weakness: most students of different proficiency levels were unable to combine ideas from different paragraphs to produce a coherent text. Not surprising, then, there were too many long summaries produced by both high- and low-proficiency students. To tackle some of the problems related to summarization, pre-reading strategies can be taught, which activate relevant prior knowledge, so that the learning of new knowledge can be facilitated. During the reading process students can become more meta-cognitively aware by monitoring their level of understanding of the text by using, for example, the strategy suggested by Schraw (1998) of "stop, read and think". Text analysis can also be used to help the students identify the main themes or macro-propositions in a text, and hence gain a more global perspective of the content, which is important for selecting the main ideas in a text. A particularly useful approach to fostering a deeper understanding of content is to use a form of reciprocal or peer-mediated teaching, in which students in pairs can articulate to each other their understanding of the main ideas expressed in the text. As part of the solution to the problems faced by students when processing information, we need to take Sewlall's (2000: 170) advice that there should be "a paradigm shift in the learning philosophy from content-based to an emphasis on the acquisition of skills". In this regard, both content and ESL teachers need to train their students in the explicit use of summarizing strategies, and to plan interwoven lessons and learning activities that develop the learners' intellectual ways of dealing with different learning problems so that they can make learning quicker, easier, more effective and exciting.
- Full Text:
- Date Issued: 2007
An investigation into e-learning acceptance in selected South African companies
- Chinyamurindi, Willie Tafadzwa
- Authors: Chinyamurindi, Willie Tafadzwa
- Date: 2007
- Subjects: Computer-assisted instruction , Electronic learning , Employees -- Training of -- Computer-assisted instruction , Internet in education
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9405 , http://hdl.handle.net/10948/487 , http://hdl.handle.net/10948/d1011908 , Computer-assisted instruction , Electronic learning , Employees -- Training of -- Computer-assisted instruction , Internet in education
- Description: The study investigated the acceptance of electronic (e-learning) based instruction in selected South African companies based upon the dominants of e-learning acceptance that included computer self-efficacy, perceived usefulness, perceived ease of use and behavioral intention to use. A quantitative research methodology was conducted on a sample of male and female trainees in selected South African companies using e-learning as a mode of instruction (N=191) using the “E-learning Acceptance Measure” by Ong and Lai (2006). Analysis of variance was used to determine whether the biographical characteristic of gender could account for any differences towards the determinants of e-learning acceptance. Multiple stepwise regression was used to determine differences between dominants of e-learning acceptance and gender. The results of the study showed that there were no statistically significant differences in mean between men’s rating of computer self-efficacy, perceived usefulness, perceived ease of use and behavioral intention than that of women. In terms of influences, the results show the existence of influence between certain dominants of e-learning acceptance however no gender differences were found in influence. Recommendations were made based upon these results on how South African companies can help trainees accept and use e-learning.
- Full Text:
- Date Issued: 2007
- Authors: Chinyamurindi, Willie Tafadzwa
- Date: 2007
- Subjects: Computer-assisted instruction , Electronic learning , Employees -- Training of -- Computer-assisted instruction , Internet in education
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9405 , http://hdl.handle.net/10948/487 , http://hdl.handle.net/10948/d1011908 , Computer-assisted instruction , Electronic learning , Employees -- Training of -- Computer-assisted instruction , Internet in education
- Description: The study investigated the acceptance of electronic (e-learning) based instruction in selected South African companies based upon the dominants of e-learning acceptance that included computer self-efficacy, perceived usefulness, perceived ease of use and behavioral intention to use. A quantitative research methodology was conducted on a sample of male and female trainees in selected South African companies using e-learning as a mode of instruction (N=191) using the “E-learning Acceptance Measure” by Ong and Lai (2006). Analysis of variance was used to determine whether the biographical characteristic of gender could account for any differences towards the determinants of e-learning acceptance. Multiple stepwise regression was used to determine differences between dominants of e-learning acceptance and gender. The results of the study showed that there were no statistically significant differences in mean between men’s rating of computer self-efficacy, perceived usefulness, perceived ease of use and behavioral intention than that of women. In terms of influences, the results show the existence of influence between certain dominants of e-learning acceptance however no gender differences were found in influence. Recommendations were made based upon these results on how South African companies can help trainees accept and use e-learning.
- Full Text:
- Date Issued: 2007
The roles of district education officers in the implementation of the guidance and counselling curriculum in Zimbabwe
- Authors: Chipenyu, Wilbert
- Date: 2007
- Subjects: Education -- Zimbabwe , Education -- Guidance -- Zimbabwe , Education -- Curricula -- Zimbabwe , School management and organization -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: vital:9557 , http://hdl.handle.net/10948/488 , Education -- Zimbabwe , Education -- Guidance -- Zimbabwe , Education -- Curricula -- Zimbabwe , School management and organization -- Zimbabwe
- Description: This study presents a description of the roles District Education Officers in the implementation of the Guidance and Counselling curriculum in Zimbabwe. The roles of the District Education Officers were researched through the literature study and empirical research. It was found that although their professional contribution is vital in successful implementation, there are other obstacles namely, financial constraints, very high workload, lack of government support and inferior appointment procedures for District Education Officers which tend to hamper them to fulfil their duties.
- Full Text:
- Date Issued: 2007
- Authors: Chipenyu, Wilbert
- Date: 2007
- Subjects: Education -- Zimbabwe , Education -- Guidance -- Zimbabwe , Education -- Curricula -- Zimbabwe , School management and organization -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: vital:9557 , http://hdl.handle.net/10948/488 , Education -- Zimbabwe , Education -- Guidance -- Zimbabwe , Education -- Curricula -- Zimbabwe , School management and organization -- Zimbabwe
- Description: This study presents a description of the roles District Education Officers in the implementation of the Guidance and Counselling curriculum in Zimbabwe. The roles of the District Education Officers were researched through the literature study and empirical research. It was found that although their professional contribution is vital in successful implementation, there are other obstacles namely, financial constraints, very high workload, lack of government support and inferior appointment procedures for District Education Officers which tend to hamper them to fulfil their duties.
- Full Text:
- Date Issued: 2007
Women living with HIV/AIDS: a phenomenological intergenerational interpretation of their experiences
- Chisaka, Janet Kaemba Chishimba
- Authors: Chisaka, Janet Kaemba Chishimba
- Date: 2007
- Subjects: AIDS (Disease) in women -- South Africa -- Case studies HIV positive women -- South Africa -- Case studies Poor women -- South Africa -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3307 , http://hdl.handle.net/10962/d1003095
- Description: This study deals with the impact of HIV/AIDS on women living in chronic poverty. The question arises: Do we focus on their HIV/AIDS stories only or do we include their other lived experiences? This phenomenological study, on two sets of three generations of women infected and affected by HIV/AIDS and living in poverty, is an attempt at understanding the way the women experience their lifeworlds, not only their HIV/AIDS stories. One set includes a grandmother, her daughter who is living with full-blown AIDS, and her granddaughter, while the other includes a grandmother, her daughter and her granddaughter infected with HIV. The initial focus of the study was on the women’s HIV/AIDS narratives. However as the study progressed, especially during the interviews, it became apparent that the women’s generational poverty or chronic poverty was of greater concern to them than the HIV/AIDS that they were experiencing. Of the six participants, only one woman centred her life story on HIV/AIDS. This finding echoes other studies on HIV/AIDS among poor women: that chronic poverty is more threatening to the women than the risk or reality of AIDS. As a phenomenological researcher my aim was to focus on the participants’ own interpretations of the studied phenomenon. However, this was inadequate in accounting for the role that social structures play in shaping and informing the women’s subjective consciousness and experience. For this reason, I used feminist ideas to understand and interpret the women’s patriarchal experiences.
- Full Text:
- Date Issued: 2007
Women living with HIV/AIDS: a phenomenological intergenerational interpretation of their experiences
- Authors: Chisaka, Janet Kaemba Chishimba
- Date: 2007
- Subjects: AIDS (Disease) in women -- South Africa -- Case studies HIV positive women -- South Africa -- Case studies Poor women -- South Africa -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3307 , http://hdl.handle.net/10962/d1003095
- Description: This study deals with the impact of HIV/AIDS on women living in chronic poverty. The question arises: Do we focus on their HIV/AIDS stories only or do we include their other lived experiences? This phenomenological study, on two sets of three generations of women infected and affected by HIV/AIDS and living in poverty, is an attempt at understanding the way the women experience their lifeworlds, not only their HIV/AIDS stories. One set includes a grandmother, her daughter who is living with full-blown AIDS, and her granddaughter, while the other includes a grandmother, her daughter and her granddaughter infected with HIV. The initial focus of the study was on the women’s HIV/AIDS narratives. However as the study progressed, especially during the interviews, it became apparent that the women’s generational poverty or chronic poverty was of greater concern to them than the HIV/AIDS that they were experiencing. Of the six participants, only one woman centred her life story on HIV/AIDS. This finding echoes other studies on HIV/AIDS among poor women: that chronic poverty is more threatening to the women than the risk or reality of AIDS. As a phenomenological researcher my aim was to focus on the participants’ own interpretations of the studied phenomenon. However, this was inadequate in accounting for the role that social structures play in shaping and informing the women’s subjective consciousness and experience. For this reason, I used feminist ideas to understand and interpret the women’s patriarchal experiences.
- Full Text:
- Date Issued: 2007
Time-resolved luminescence of low sensitivity quartz from crystalline rocks
- Chithambo, Makaiko L, Preusser, F, Ramseyer, K, Ogundare, F O
- Authors: Chithambo, Makaiko L , Preusser, F , Ramseyer, K , Ogundare, F O
- Date: 2007
- Language: English
- Type: text , article
- Identifier: vital:6801 , http://hdl.handle.net/10962/d1004164 , https://doi.org/10.1016/j.radmeas.2006.07.005
- Description: preprint , Time-resolved luminescence spectra of low sensitivity natural quartz from crystalline rocks are presented. The luminescence was pulse-stimulated at width using 470 nm blue light from quartz separated from plutonic, metamorphic, volcanic and hydrothermal samples. Measurements were made at 20 °C. All samples show evidence of a short lifetime component less than long although in several cases too weak in intensity to be evaluated accurately. On the other hand, the value of the principal lifetime component varies considerably being about in metamorphic quartz, in plutonic quartz, and in one example of hydrothermal quartz. The results illustrate a new feature of luminescence from quartz for which lifetimes less than or greater than have never been reported at room temperature before. It is argued that the thermal provenance of the quartz and so the annealing it will have experienced influences the size of the observed lifetime. In particular, the results are explained in terms of a model consisting of three luminescence centers with the dominant lifetime linked to preferential recombination at one center depending on the thermal history of the sample and hence the hole concentration of the center.
- Full Text:
- Date Issued: 2007
- Authors: Chithambo, Makaiko L , Preusser, F , Ramseyer, K , Ogundare, F O
- Date: 2007
- Language: English
- Type: text , article
- Identifier: vital:6801 , http://hdl.handle.net/10962/d1004164 , https://doi.org/10.1016/j.radmeas.2006.07.005
- Description: preprint , Time-resolved luminescence spectra of low sensitivity natural quartz from crystalline rocks are presented. The luminescence was pulse-stimulated at width using 470 nm blue light from quartz separated from plutonic, metamorphic, volcanic and hydrothermal samples. Measurements were made at 20 °C. All samples show evidence of a short lifetime component less than long although in several cases too weak in intensity to be evaluated accurately. On the other hand, the value of the principal lifetime component varies considerably being about in metamorphic quartz, in plutonic quartz, and in one example of hydrothermal quartz. The results illustrate a new feature of luminescence from quartz for which lifetimes less than or greater than have never been reported at room temperature before. It is argued that the thermal provenance of the quartz and so the annealing it will have experienced influences the size of the observed lifetime. In particular, the results are explained in terms of a model consisting of three luminescence centers with the dominant lifetime linked to preferential recombination at one center depending on the thermal history of the sample and hence the hole concentration of the center.
- Full Text:
- Date Issued: 2007
Service provider's perceptions of the quality and accessiblity of health services under social health insurance in Dar-Es-Salaam
- Authors: Chomi, Eunice Nahyuha
- Date: 2007
- Subjects: Health insurance -- Tanzania , Medical personnel -- Insurance requirements -- Tanzania
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10079 , http://hdl.handle.net/10948/489 , Health insurance -- Tanzania , Medical personnel -- Insurance requirements -- Tanzania
- Description: Social health insurance is a form of health care financing that has gained increased attention in African countries in the past decade. Tanzania introduced social health insurance by the establishment of the National Health Insurance Fund (NHIF) in 1999 with, inter alia, the objective of improvement of the quality and availability of health services. The goal of this study was to determine the perceptions of services providers on the quality and accessibility of health services following the introduction of social health insurance. A qualitative approach was used to gain an insider's perspective from the service providers of how the services have changed following the introduction of the scheme. Individual interviews, observation and field notes were used to gather information on the quality and accessibility of health services under the policy of social health insurance. Data were analysed using Tesch's method of data analysis. The health workers generally perceived the fund as being beneficial to its members as it reduced the financial barriers to receiving health care. However, the objectives of the NHIF as a health financing mechanism were not adequately understood by the health workers. Although they perceived the quality of health services as having improved compared to previous years, they did not associate this improvement with the NHIF. The health workers also perceived accessibility of health services as having improved for insured patients but not for non-insured patients.
- Full Text:
- Date Issued: 2007
- Authors: Chomi, Eunice Nahyuha
- Date: 2007
- Subjects: Health insurance -- Tanzania , Medical personnel -- Insurance requirements -- Tanzania
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10079 , http://hdl.handle.net/10948/489 , Health insurance -- Tanzania , Medical personnel -- Insurance requirements -- Tanzania
- Description: Social health insurance is a form of health care financing that has gained increased attention in African countries in the past decade. Tanzania introduced social health insurance by the establishment of the National Health Insurance Fund (NHIF) in 1999 with, inter alia, the objective of improvement of the quality and availability of health services. The goal of this study was to determine the perceptions of services providers on the quality and accessibility of health services following the introduction of social health insurance. A qualitative approach was used to gain an insider's perspective from the service providers of how the services have changed following the introduction of the scheme. Individual interviews, observation and field notes were used to gather information on the quality and accessibility of health services under the policy of social health insurance. Data were analysed using Tesch's method of data analysis. The health workers generally perceived the fund as being beneficial to its members as it reduced the financial barriers to receiving health care. However, the objectives of the NHIF as a health financing mechanism were not adequately understood by the health workers. Although they perceived the quality of health services as having improved compared to previous years, they did not associate this improvement with the NHIF. The health workers also perceived accessibility of health services as having improved for insured patients but not for non-insured patients.
- Full Text:
- Date Issued: 2007
The microbial ecology of sulphidogenic lignocellulose degradation
- Authors: Clarke, Anna Maria
- Date: 2007
- Subjects: Microbial ecology , Lignocellulose , Sulfides , Lignin , Lignocellulose -- Biodegradation , Mines and mineral resources -- Waste disposal , Acid mine drainage
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4094 , http://hdl.handle.net/10962/d1008181
- Description: Acid mine drainage is a well known environmental pollutant, not only in South Africa, but throughout the world, and the use of microbial processes in the treatment of these wastes has been the subject of investigation over past decades. Lignocellulose packed-bed reactors have been used in passive treatment systems, and, although effective initially, they show early decline in performance while the packing material remains largely un-utilized. Little is known about this phenomenon which remains a severe constraint in the development of efficient passive mine water treatment systems. It has been proposed that the degradation pathways of the complex lignocellulose substrate may be limited in some way in these systems during the manifestation of this effect. This study has addressed the problem using a molecular microbial ecology methodology in an attempt to relate trophic functions of the microbial population to the physico-chemical data of the system. A field-scale lignocellulose packed-bed reactor located at Vryheid Coronation Colliery (Northern Kwa-Zulu Natal province, South Africa) was monitored for six years and the results showed the classic profile of performance decline related to a slowdown in sulphate reduction and alkalinity production. The reactor was decommissioned , comprehensive samples were collected along the depth profile and the microbial populations investigated by means of 16S rRNA gene methodology. The population was found to include cellulolytic Clostridia spp., CytophagaIFlavobacterlBacteroidetes, Sphingomonadaceae and as yet uncultured microorganisms related to microbiota identified in the rumen and termite gut. These are all known to be involved as primary fermenters of cellulose. Oesulphosporosinus was present as sulphate reducer. A comparison of substrata sampling and population distribution suggested that spatial and temporal gradients within the system may become established over the course of its operation. Based on these findings, a laboratory-scale reactor was constructed to simulate the performance of the packed-bed reactor under controlled experimental conditions. The laboratory-scale reactor was operated for 273 days and showed comparable performance to that in the field in both biomolecular and physicochemical data. Clearly defined trophic niches were observed. These results suggested that a sequence of events does occur in lignocellulose degradation over time. Based on the spatial and temporal column studies, a descriptive model was proposed to account for these events. It was found that fermentative organisms predominate in the inlet zone of the system using easily extractable compounds from the wood, thus providing feedstock for sulphate reduction occurring in the succeeding compartments. Production of sulphide and alkalinity appears to be involved in the enhancement of lignin degradation and this, in turn, appears to enhance access to the cellulose fraction. However, once the readily extractables are exhausted, the decline in sulphide and alkalinity production leads inexorably to a decline in the overall performance of the system as a sulphate reducing unit operation. These observations led to the proposal that with the addition of a limited amount of a readily available carbon source, such as molasses, in the initial zone of the the reactor, the ongoing generation of sulphide would be sustained and this in turn would sustain the microbial attack on the lignocellulose complex. This proposal was tested in scale-up studies and positive results indicate that the descriptive model may, to some extent, provide an account of events occurring in these systems. The work on sustaining lignocellulose degradation through the maintenance of sulphate reduction in the initial stages of the reactor flow path has led to the development of the Degrading Packed-bed Reactor concept and that, has subsequently been successfully evaluated in the field.
- Full Text:
- Date Issued: 2007
- Authors: Clarke, Anna Maria
- Date: 2007
- Subjects: Microbial ecology , Lignocellulose , Sulfides , Lignin , Lignocellulose -- Biodegradation , Mines and mineral resources -- Waste disposal , Acid mine drainage
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4094 , http://hdl.handle.net/10962/d1008181
- Description: Acid mine drainage is a well known environmental pollutant, not only in South Africa, but throughout the world, and the use of microbial processes in the treatment of these wastes has been the subject of investigation over past decades. Lignocellulose packed-bed reactors have been used in passive treatment systems, and, although effective initially, they show early decline in performance while the packing material remains largely un-utilized. Little is known about this phenomenon which remains a severe constraint in the development of efficient passive mine water treatment systems. It has been proposed that the degradation pathways of the complex lignocellulose substrate may be limited in some way in these systems during the manifestation of this effect. This study has addressed the problem using a molecular microbial ecology methodology in an attempt to relate trophic functions of the microbial population to the physico-chemical data of the system. A field-scale lignocellulose packed-bed reactor located at Vryheid Coronation Colliery (Northern Kwa-Zulu Natal province, South Africa) was monitored for six years and the results showed the classic profile of performance decline related to a slowdown in sulphate reduction and alkalinity production. The reactor was decommissioned , comprehensive samples were collected along the depth profile and the microbial populations investigated by means of 16S rRNA gene methodology. The population was found to include cellulolytic Clostridia spp., CytophagaIFlavobacterlBacteroidetes, Sphingomonadaceae and as yet uncultured microorganisms related to microbiota identified in the rumen and termite gut. These are all known to be involved as primary fermenters of cellulose. Oesulphosporosinus was present as sulphate reducer. A comparison of substrata sampling and population distribution suggested that spatial and temporal gradients within the system may become established over the course of its operation. Based on these findings, a laboratory-scale reactor was constructed to simulate the performance of the packed-bed reactor under controlled experimental conditions. The laboratory-scale reactor was operated for 273 days and showed comparable performance to that in the field in both biomolecular and physicochemical data. Clearly defined trophic niches were observed. These results suggested that a sequence of events does occur in lignocellulose degradation over time. Based on the spatial and temporal column studies, a descriptive model was proposed to account for these events. It was found that fermentative organisms predominate in the inlet zone of the system using easily extractable compounds from the wood, thus providing feedstock for sulphate reduction occurring in the succeeding compartments. Production of sulphide and alkalinity appears to be involved in the enhancement of lignin degradation and this, in turn, appears to enhance access to the cellulose fraction. However, once the readily extractables are exhausted, the decline in sulphide and alkalinity production leads inexorably to a decline in the overall performance of the system as a sulphate reducing unit operation. These observations led to the proposal that with the addition of a limited amount of a readily available carbon source, such as molasses, in the initial zone of the the reactor, the ongoing generation of sulphide would be sustained and this in turn would sustain the microbial attack on the lignocellulose complex. This proposal was tested in scale-up studies and positive results indicate that the descriptive model may, to some extent, provide an account of events occurring in these systems. The work on sustaining lignocellulose degradation through the maintenance of sulphate reduction in the initial stages of the reactor flow path has led to the development of the Degrading Packed-bed Reactor concept and that, has subsequently been successfully evaluated in the field.
- Full Text:
- Date Issued: 2007
Securing media streams in an Asterisk-based environment and evaluating the resulting performance cost
- Authors: Clayton, Bradley
- Date: 2007 , 2007-01-08
- Subjects: Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4647 , http://hdl.handle.net/10962/d1006606 , Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Description: When adding Confidentiality, Integrity and Availability (CIA) to a multi-user VoIP (Voice over IP) system, performance and quality are at risk. The aim of this study is twofold. Firstly, it describes current methods suitable to secure voice streams within a VoIP system and make them available in an Asterisk-based VoIP environment. (Asterisk is a well established, open-source, TDM/VoIP PBX.) Secondly, this study evaluates the performance cost incurred after implementing each security method within the Asterisk-based system, using a special testbed suite, named DRAPA, which was developed expressly for this study. The three security methods implemented and studied were IPSec (Internet Protocol Security), SRTP (Secure Real-time Transport Protocol), and SIAX2 (Secure Inter-Asterisk eXchange 2 protocol). From the experiments, it was found that bandwidth and CPU usage were significantly affected by the addition of CIA. In ranking the three security methods in terms of these two resources, it was found that SRTP incurs the least bandwidth overhead, followed by SIAX2 and then IPSec. Where CPU utilisation is concerned, it was found that SIAX2 incurs the least overhead, followed by IPSec, and then SRTP.
- Full Text:
- Date Issued: 2007
- Authors: Clayton, Bradley
- Date: 2007 , 2007-01-08
- Subjects: Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4647 , http://hdl.handle.net/10962/d1006606 , Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Description: When adding Confidentiality, Integrity and Availability (CIA) to a multi-user VoIP (Voice over IP) system, performance and quality are at risk. The aim of this study is twofold. Firstly, it describes current methods suitable to secure voice streams within a VoIP system and make them available in an Asterisk-based VoIP environment. (Asterisk is a well established, open-source, TDM/VoIP PBX.) Secondly, this study evaluates the performance cost incurred after implementing each security method within the Asterisk-based system, using a special testbed suite, named DRAPA, which was developed expressly for this study. The three security methods implemented and studied were IPSec (Internet Protocol Security), SRTP (Secure Real-time Transport Protocol), and SIAX2 (Secure Inter-Asterisk eXchange 2 protocol). From the experiments, it was found that bandwidth and CPU usage were significantly affected by the addition of CIA. In ranking the three security methods in terms of these two resources, it was found that SRTP incurs the least bandwidth overhead, followed by SIAX2 and then IPSec. Where CPU utilisation is concerned, it was found that SIAX2 incurs the least overhead, followed by IPSec, and then SRTP.
- Full Text:
- Date Issued: 2007
Trust on the semantic web
- Authors: Cloran, Russell Andrew
- Date: 2007 , 2006-08-07
- Subjects: Semantic Web , RDF (Document markup language) , XML (Document markup language) , Knowledge acquisition (Expert systems) , Data protection
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4649 , http://hdl.handle.net/10962/d1006616 , Semantic Web , RDF (Document markup language) , XML (Document markup language) , Knowledge acquisition (Expert systems) , Data protection
- Description: The Semantic Web is a vision to create a “web of knowledge”; an extension of the Web as we know it which will create an information space which will be usable by machines in very rich ways. The technologies which make up the Semantic Web allow machines to reason across information gathered from the Web, presenting only relevant results and inferences to the user. Users of the Web in its current form assess the credibility of the information they gather in a number of different ways. If processing happens without the user being able to check the source and credibility of each piece of information used in the processing, the user must be able to trust that the machine has used trustworthy information at each step of the processing. The machine should therefore be able to automatically assess the credibility of each piece of information it gathers from the Web. A case study on advanced checks for website credibility is presented, and the site presented in the case presented is found to be credible, despite failing many of the checks which are presented. A website with a backend based on RDF technologies is constructed. A better understanding of RDF technologies and good knowledge of the RAP and Redland RDF application frameworks is gained. The second aim of constructing the website was to gather information to be used for testing various trust metrics. The website did not gain widespread support, and therefore not enough data was gathered for this. Techniques for presenting RDF data to users were also developed during website development, and these are discussed. Experiences in gathering RDF data are presented next. A scutter was successfully developed, and the data smushed to create a database where uniquely identifiable objects were linked, even where gathered from different sources. Finally, the use of digital signature as a means of linking an author and content produced by that author is presented. RDF/XML canonicalisation is discussed in the provision of ideal cryptographic checking of RDF graphs, rather than simply checking at the document level. The notion of canonicalisation on the semantic, structural and syntactic levels is proposed. A combination of an existing canonicalisation algorithm and a restricted RDF/XML dialect is presented as a solution to the RDF/XML canonicalisation problem. We conclude that a trusted Semantic Web is possible, with buy in from publishing and consuming parties.
- Full Text:
- Date Issued: 2007
- Authors: Cloran, Russell Andrew
- Date: 2007 , 2006-08-07
- Subjects: Semantic Web , RDF (Document markup language) , XML (Document markup language) , Knowledge acquisition (Expert systems) , Data protection
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4649 , http://hdl.handle.net/10962/d1006616 , Semantic Web , RDF (Document markup language) , XML (Document markup language) , Knowledge acquisition (Expert systems) , Data protection
- Description: The Semantic Web is a vision to create a “web of knowledge”; an extension of the Web as we know it which will create an information space which will be usable by machines in very rich ways. The technologies which make up the Semantic Web allow machines to reason across information gathered from the Web, presenting only relevant results and inferences to the user. Users of the Web in its current form assess the credibility of the information they gather in a number of different ways. If processing happens without the user being able to check the source and credibility of each piece of information used in the processing, the user must be able to trust that the machine has used trustworthy information at each step of the processing. The machine should therefore be able to automatically assess the credibility of each piece of information it gathers from the Web. A case study on advanced checks for website credibility is presented, and the site presented in the case presented is found to be credible, despite failing many of the checks which are presented. A website with a backend based on RDF technologies is constructed. A better understanding of RDF technologies and good knowledge of the RAP and Redland RDF application frameworks is gained. The second aim of constructing the website was to gather information to be used for testing various trust metrics. The website did not gain widespread support, and therefore not enough data was gathered for this. Techniques for presenting RDF data to users were also developed during website development, and these are discussed. Experiences in gathering RDF data are presented next. A scutter was successfully developed, and the data smushed to create a database where uniquely identifiable objects were linked, even where gathered from different sources. Finally, the use of digital signature as a means of linking an author and content produced by that author is presented. RDF/XML canonicalisation is discussed in the provision of ideal cryptographic checking of RDF graphs, rather than simply checking at the document level. The notion of canonicalisation on the semantic, structural and syntactic levels is proposed. A combination of an existing canonicalisation algorithm and a restricted RDF/XML dialect is presented as a solution to the RDF/XML canonicalisation problem. We conclude that a trusted Semantic Web is possible, with buy in from publishing and consuming parties.
- Full Text:
- Date Issued: 2007
The use of Landsat ETM imagery as a suitable data capture source for alien acacia species for the WFW programme
- Authors: Cobbing, Benedict Louis
- Date: 2007
- Subjects: Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4856 , http://hdl.handle.net/10962/d1005532 , Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Description: Geographic Information System technology today allows for the rapid analysis of vast amounts of spatial and non-spatial data. The power of a GIS can only be effected with the rapid collection of accurate input data. This is particularly true in the case of the South African National Working for Water (WFW) Programme where large volumes of spatial data on alien vegetation infestations are captured throughout the country. Alien vegetation clearing contracts cannot be generated, for WFW, without this data, so that the accurate capture of such data is crucial to the success of the programme. Mapping Invasive Alien Plant (IAP) data within WFW is a perennial problem (Coetzee, pers com, 2002), because not enough mapping is being done to meet the annual requirements of the programme in the various provinces. This is re-iterated by Richardson, 2004, who states that there is a shortage of accurate data on IAP abundance in South Africa. Therefore there is a need to investigate alternate methods of data capture; such as remote sensing, whilst working within the existing WFW data capture standards. The aim of this research was to investigate the use of Landsat ETM imagery as a data capture source for mapping alien vegetation for the WFW Programme in terms of their approved mapping methods, for both automated and manual classification techniques. The automated and manual classification results were compared to control data captured by differential Global Positioning Systems (DGPS). The research tested the various methods of data capture using Landsat ETM images over a range of study sites of varying complexity: a simple grassland area, a medium complexity grassy fynbos site and a complicated indigenous forest site. An important component of the research was to develop a mapping (classification) Ranking System based upon variables identified by WFW as fundamental in data capture decision making: spatial and positional accuracy, time constraints and cost constraints for three typical alien invaded areas. The mapping Ranking System compared the results of the various mapping methods for each factor for the study sites against each other. This provided an indication of which mapping method is the most efficient or suitable for a particular area.
- Full Text:
- Date Issued: 2007
- Authors: Cobbing, Benedict Louis
- Date: 2007
- Subjects: Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4856 , http://hdl.handle.net/10962/d1005532 , Geographic information systems , Global Positioning System , Landsat satellites , Agriculture -- Remote sensing , Geography -- Remote sensing
- Description: Geographic Information System technology today allows for the rapid analysis of vast amounts of spatial and non-spatial data. The power of a GIS can only be effected with the rapid collection of accurate input data. This is particularly true in the case of the South African National Working for Water (WFW) Programme where large volumes of spatial data on alien vegetation infestations are captured throughout the country. Alien vegetation clearing contracts cannot be generated, for WFW, without this data, so that the accurate capture of such data is crucial to the success of the programme. Mapping Invasive Alien Plant (IAP) data within WFW is a perennial problem (Coetzee, pers com, 2002), because not enough mapping is being done to meet the annual requirements of the programme in the various provinces. This is re-iterated by Richardson, 2004, who states that there is a shortage of accurate data on IAP abundance in South Africa. Therefore there is a need to investigate alternate methods of data capture; such as remote sensing, whilst working within the existing WFW data capture standards. The aim of this research was to investigate the use of Landsat ETM imagery as a data capture source for mapping alien vegetation for the WFW Programme in terms of their approved mapping methods, for both automated and manual classification techniques. The automated and manual classification results were compared to control data captured by differential Global Positioning Systems (DGPS). The research tested the various methods of data capture using Landsat ETM images over a range of study sites of varying complexity: a simple grassland area, a medium complexity grassy fynbos site and a complicated indigenous forest site. An important component of the research was to develop a mapping (classification) Ranking System based upon variables identified by WFW as fundamental in data capture decision making: spatial and positional accuracy, time constraints and cost constraints for three typical alien invaded areas. The mapping Ranking System compared the results of the various mapping methods for each factor for the study sites against each other. This provided an indication of which mapping method is the most efficient or suitable for a particular area.
- Full Text:
- Date Issued: 2007
Impact of nutrients and herbivory by Eccritotarsus catarinensis on the biological control of water hyacinth, Eichhornia crassipes
- Coetzee, Julie A, Byrne, Marcus J, Hill, Martin P
- Authors: Coetzee, Julie A , Byrne, Marcus J , Hill, Martin P
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:6945 , http://hdl.handle.net/10962/d1011973 , https://orcid.org/0000-0003-0579-5298
- Description: Many water hyacinth infestations in South Africa are the symptom of eutrophication, and as a result, biological control of this weed is variable. This study examined the effects of herbivory by the mirid, Eccritotarsus catarinensis, on water hyacinth grown at high, medium and low nitrogen (N) and phosphorus (P) nutrient concentrations. Water nutrient concentration appears to be the overriding factor affecting plant growth parameters of water hyacinth plants—at high nutrient concentrations, leaf and daughter plant production were more than double than at low nutrient concentrations, while stem length was twice as great at high nutrient concentrations compared to low concentrations. Chlorophyll content was also twice as high at high nutrient concentrations than low concentrations. Conversely, flower production at high nutrient concentrations was less than half that at low concentrations. Herbivory by E. catarinensis did not have as great an effect on water hyacinth vigour as nutrient concentration did, although it significantly reduced the production of daughter plants by 23 ± 9%, the length of the second petiole by 13 ± 5%, and chlorophyll content of water hyacinth leaves by 15 ± 6%. In terms of insect numbers, mirids performed better on plants grown under medium nutrient conditions (99 ± 28 S.E.), compared to high nutrient concentrations (52 ± 27 S.E.), and low nutrient concentrations (25 ± 30 S.E.). Thus, these results suggest that the fastest and most significant reduction in water hyacinth proliferation would be reached by lowering the water nutrient concentrations, and herbivory by E. catarinensis alone is not sufficient to reduce all aspects of water hyacinth vigour, especially at very high nutrient concentrations.
- Full Text:
- Date Issued: 2007
- Authors: Coetzee, Julie A , Byrne, Marcus J , Hill, Martin P
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:6945 , http://hdl.handle.net/10962/d1011973 , https://orcid.org/0000-0003-0579-5298
- Description: Many water hyacinth infestations in South Africa are the symptom of eutrophication, and as a result, biological control of this weed is variable. This study examined the effects of herbivory by the mirid, Eccritotarsus catarinensis, on water hyacinth grown at high, medium and low nitrogen (N) and phosphorus (P) nutrient concentrations. Water nutrient concentration appears to be the overriding factor affecting plant growth parameters of water hyacinth plants—at high nutrient concentrations, leaf and daughter plant production were more than double than at low nutrient concentrations, while stem length was twice as great at high nutrient concentrations compared to low concentrations. Chlorophyll content was also twice as high at high nutrient concentrations than low concentrations. Conversely, flower production at high nutrient concentrations was less than half that at low concentrations. Herbivory by E. catarinensis did not have as great an effect on water hyacinth vigour as nutrient concentration did, although it significantly reduced the production of daughter plants by 23 ± 9%, the length of the second petiole by 13 ± 5%, and chlorophyll content of water hyacinth leaves by 15 ± 6%. In terms of insect numbers, mirids performed better on plants grown under medium nutrient conditions (99 ± 28 S.E.), compared to high nutrient concentrations (52 ± 27 S.E.), and low nutrient concentrations (25 ± 30 S.E.). Thus, these results suggest that the fastest and most significant reduction in water hyacinth proliferation would be reached by lowering the water nutrient concentrations, and herbivory by E. catarinensis alone is not sufficient to reduce all aspects of water hyacinth vigour, especially at very high nutrient concentrations.
- Full Text:
- Date Issued: 2007
Resilience in families living with a Type I diabetic child
- Authors: Coetzee, Mariska
- Date: 2007
- Subjects: Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9922 , http://hdl.handle.net/10948/665 , Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Description: Type I diabetes has the ability to promote change in the family. In truth, although the child with diabetes is the diagnosed patient, the whole family has diabetes. While the challenges that families have to face are many, families seem to have the ability to “bounce back” (i.e., they have resilience). Research on the construct of resilience, and more specifically, family resilience has surged in recent times. However, South African research on family resilience is limited. This study aimed to explore and describe the factors that facilitate adjustment and adaptation in families that include a child living with Type I diabetes. The Resiliency Model of Stress, Adjustment and Adaptation, developed by McCubbin and McCubbin (2001) served as a framework to conceptualise the families’ adjustment and adaptation process. Non-probability purposive and snowball sampling techniques were employed. Sixteen families participated in this study, providing a total of 31 participants. Participants consisted of the caregivers of a family living with a child between the ages of four and 12 with Type I diabetes. The study was triangular in nature, with an exploratory, descriptive approach. A biographical questionnaire with an open-ended question was used in conjunction with seven other questionnaires to gather data. These questionnaires were: The Family Hardiness Index (FHI), the Family Time and Routine Index (FTRI), the Social Support Index (SSI), the Family Problem-Solving Communication (FPSC) Index, the Family Crises-Oriented Personal Evaluation Scales (F-COPES), the Relative and Friend Support Index, and the Family Attachment and Changeability Index 8 (FACI8). Descriptive statistics were used to describe the biographical information. Quantitative data were analysed by means of correlation and regression analysis, and a content analysis was conducted to analyse the qualitative data. The results of the quantitative analysis indicated three significant positive correlations with the FACI8. These variables were family hardiness (measured by the FHI), family problem-solving communication (measured by the FPSC), and family time and routines (measured by the FTRI). The results of the qualitative analysis revealed that social support, the caregivers’ acceptance of the condition, and spirituality and religion were the most important strength factors that contributed to the families’ adjustment and adaptation. Although the study had a small sample and many limitations, the study could be used as a stepping-stone for future research on resilience in families living with chronic medical conditions and will contribute to family resilience research in the South African context.
- Full Text:
- Date Issued: 2007
- Authors: Coetzee, Mariska
- Date: 2007
- Subjects: Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9922 , http://hdl.handle.net/10948/665 , Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Description: Type I diabetes has the ability to promote change in the family. In truth, although the child with diabetes is the diagnosed patient, the whole family has diabetes. While the challenges that families have to face are many, families seem to have the ability to “bounce back” (i.e., they have resilience). Research on the construct of resilience, and more specifically, family resilience has surged in recent times. However, South African research on family resilience is limited. This study aimed to explore and describe the factors that facilitate adjustment and adaptation in families that include a child living with Type I diabetes. The Resiliency Model of Stress, Adjustment and Adaptation, developed by McCubbin and McCubbin (2001) served as a framework to conceptualise the families’ adjustment and adaptation process. Non-probability purposive and snowball sampling techniques were employed. Sixteen families participated in this study, providing a total of 31 participants. Participants consisted of the caregivers of a family living with a child between the ages of four and 12 with Type I diabetes. The study was triangular in nature, with an exploratory, descriptive approach. A biographical questionnaire with an open-ended question was used in conjunction with seven other questionnaires to gather data. These questionnaires were: The Family Hardiness Index (FHI), the Family Time and Routine Index (FTRI), the Social Support Index (SSI), the Family Problem-Solving Communication (FPSC) Index, the Family Crises-Oriented Personal Evaluation Scales (F-COPES), the Relative and Friend Support Index, and the Family Attachment and Changeability Index 8 (FACI8). Descriptive statistics were used to describe the biographical information. Quantitative data were analysed by means of correlation and regression analysis, and a content analysis was conducted to analyse the qualitative data. The results of the quantitative analysis indicated three significant positive correlations with the FACI8. These variables were family hardiness (measured by the FHI), family problem-solving communication (measured by the FPSC), and family time and routines (measured by the FTRI). The results of the qualitative analysis revealed that social support, the caregivers’ acceptance of the condition, and spirituality and religion were the most important strength factors that contributed to the families’ adjustment and adaptation. Although the study had a small sample and many limitations, the study could be used as a stepping-stone for future research on resilience in families living with chronic medical conditions and will contribute to family resilience research in the South African context.
- Full Text:
- Date Issued: 2007
The legal history of in-transit robbery
- Authors: Coetzer, André Lodewyk
- Date: 2007
- Subjects: Robbery -- History , Robbery -- South Africa -- History
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10263 , http://hdl.handle.net/10948/829 , Robbery -- History , Robbery -- South Africa -- History
- Description: The crime of in-transit robbery is a sub-specie of the common law crime of robbery, which in essence is a crime of theft with violence. Robbery had evolved from begging, where beggars would harass their victims for money or items of value and then elevating their begging efforts to threats of violence, and in certain instances the usage of physical violence to solicit alms. As soon as road transport became prominent in society, the incidence of in-transit robbery increased where violence was used to overcome any form of resistance from the victim. During sea-faring transportation, piracy occurred using similar methods of violence to obtain goods from victims. In-transit robbery has undergone many changes in terms of modus operandi. From the early days of violent begging during the Roman Empire it has now become a greed driven, carefully planned crime, which is executed with military precision with high technology weapons of war. Robbery has advanced in judicial terms from a non-codified crime to a specific defined crime which carries prescribed minimum sentencing as punishment. , Abstract
- Full Text:
- Date Issued: 2007
- Authors: Coetzer, André Lodewyk
- Date: 2007
- Subjects: Robbery -- History , Robbery -- South Africa -- History
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10263 , http://hdl.handle.net/10948/829 , Robbery -- History , Robbery -- South Africa -- History
- Description: The crime of in-transit robbery is a sub-specie of the common law crime of robbery, which in essence is a crime of theft with violence. Robbery had evolved from begging, where beggars would harass their victims for money or items of value and then elevating their begging efforts to threats of violence, and in certain instances the usage of physical violence to solicit alms. As soon as road transport became prominent in society, the incidence of in-transit robbery increased where violence was used to overcome any form of resistance from the victim. During sea-faring transportation, piracy occurred using similar methods of violence to obtain goods from victims. In-transit robbery has undergone many changes in terms of modus operandi. From the early days of violent begging during the Roman Empire it has now become a greed driven, carefully planned crime, which is executed with military precision with high technology weapons of war. Robbery has advanced in judicial terms from a non-codified crime to a specific defined crime which carries prescribed minimum sentencing as punishment. , Abstract
- Full Text:
- Date Issued: 2007
Opportunity and constraint : historicity, hybridity and notions of cultural identity among farm workers in the Sundays River Valley
- Authors: Connor, Teresa Kathleen
- Date: 2007
- Subjects: Agricultural laborers -- South Africa -- Relocation Addo Elephant National Park (South Africa) Xhosa (African people) -- South Africa -- Eastern Cape -- Ethnic identity Forced migration -- South Africa -- Eastern Cape Land settlement -- South Africa -- Government policy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2117 , http://hdl.handle.net/10962/d1008367
- Description: This thesis focuses on relationships of opportunity and constraint among farm workers in the Sundays River Valley (SRV), Eastern Cape Province. Relationships of 'constraint' include those experiences of displacement and forced removal and war, including forced removals by the apartheid state in 1960 and 1970. Relationships of 'opportunity' include the ways in which residents in the SRV have contested their experiences of upheaval and domination, and the formation of a regional sense of place and belonging/ investigate how farm workers actually draw elements of locality and identity from their experiences of upheaval, and how displacement bolsters feelings of belonging and place. Instead of viewing displacement as a once-off experience, this thesis investigates displacement in historical terms, as a long-term, 'serial' experience of human movement, which is continued in the present- specifically through the creation of the Greater Addo Elephant National Park. I concentrate on developing a spatialised and cultural notion of movemenUplacement. 'Place' is investigated as a term that refers to rather indeterminate feelings of nostalgia, memory and identity, which depend on a particular connection to territory (ie: 'space'). I emphasise that elements of place in the SRV are drawn from and expressed along dualistic lines, which juxtapose situations of opportunity and constraint. In this way, farm workers' sense of connection to farms and ancestral territory in the SRV depends on their experiences of stable residency and work on farms, as well as their memories of removal from land in the area. I emphasise that those elements of conservatism (expressed as 'tradition' and Redness) among Xhosa-speaking farm workers are indications of a certain hybridity of identity in the region, which depend on differentiation from other groups (such as so-called 'coloured' farm workers and 'white' farmers), as well as associations between these groups. This thesis lays emphasis upon those less visible and definable 'identities' in the Eastern Cape Province, specifically by shifting focus away from the exhomeland states of the Ciskei and Transkei, to more marginal expressions of identity and change (among farm workers) in the Province. I point out that labourers cannot solely be defined by their positions as farm workers, but by their place and sense of cultural belonging in the area. In this sense, I use the idea of work as a loaded concept that can comment on a range of cultural attitudes towards belonging and place, and which is firmly embedded in the private lives of labourers - beyond their simple socio-economic conditions of farm work. I use Bourdieu's conception of habitus and doxa to define work as a set of dispositions that have been historicised and internalised by workers to such an extent, that relationships of domination are sometimes inadvertently obscured through their apparent 'naturalness'. Moreover, I point out that work can be related to ritualised action in the SRV through the use of performance and practice-based anthropological theory. Both work and ritual are symbolic actions, and are sites of struggle within which workers express themselves dualistically. Rituals, specifically, are dramatic events that combine disharmonious and harmonious social processes - juxtaposing the powerlessness of workers (on farms), and the deep sense of belonging and place in the SRV. I argue that the deep historical connections in the SRV have largely been ignored by conservationists in the drive to establish new protected zones (such as the Greater Addo Elephant National Park), and that a new model of shared conservation management is needed for this Park.
- Full Text:
- Date Issued: 2007
- Authors: Connor, Teresa Kathleen
- Date: 2007
- Subjects: Agricultural laborers -- South Africa -- Relocation Addo Elephant National Park (South Africa) Xhosa (African people) -- South Africa -- Eastern Cape -- Ethnic identity Forced migration -- South Africa -- Eastern Cape Land settlement -- South Africa -- Government policy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2117 , http://hdl.handle.net/10962/d1008367
- Description: This thesis focuses on relationships of opportunity and constraint among farm workers in the Sundays River Valley (SRV), Eastern Cape Province. Relationships of 'constraint' include those experiences of displacement and forced removal and war, including forced removals by the apartheid state in 1960 and 1970. Relationships of 'opportunity' include the ways in which residents in the SRV have contested their experiences of upheaval and domination, and the formation of a regional sense of place and belonging/ investigate how farm workers actually draw elements of locality and identity from their experiences of upheaval, and how displacement bolsters feelings of belonging and place. Instead of viewing displacement as a once-off experience, this thesis investigates displacement in historical terms, as a long-term, 'serial' experience of human movement, which is continued in the present- specifically through the creation of the Greater Addo Elephant National Park. I concentrate on developing a spatialised and cultural notion of movemenUplacement. 'Place' is investigated as a term that refers to rather indeterminate feelings of nostalgia, memory and identity, which depend on a particular connection to territory (ie: 'space'). I emphasise that elements of place in the SRV are drawn from and expressed along dualistic lines, which juxtapose situations of opportunity and constraint. In this way, farm workers' sense of connection to farms and ancestral territory in the SRV depends on their experiences of stable residency and work on farms, as well as their memories of removal from land in the area. I emphasise that those elements of conservatism (expressed as 'tradition' and Redness) among Xhosa-speaking farm workers are indications of a certain hybridity of identity in the region, which depend on differentiation from other groups (such as so-called 'coloured' farm workers and 'white' farmers), as well as associations between these groups. This thesis lays emphasis upon those less visible and definable 'identities' in the Eastern Cape Province, specifically by shifting focus away from the exhomeland states of the Ciskei and Transkei, to more marginal expressions of identity and change (among farm workers) in the Province. I point out that labourers cannot solely be defined by their positions as farm workers, but by their place and sense of cultural belonging in the area. In this sense, I use the idea of work as a loaded concept that can comment on a range of cultural attitudes towards belonging and place, and which is firmly embedded in the private lives of labourers - beyond their simple socio-economic conditions of farm work. I use Bourdieu's conception of habitus and doxa to define work as a set of dispositions that have been historicised and internalised by workers to such an extent, that relationships of domination are sometimes inadvertently obscured through their apparent 'naturalness'. Moreover, I point out that work can be related to ritualised action in the SRV through the use of performance and practice-based anthropological theory. Both work and ritual are symbolic actions, and are sites of struggle within which workers express themselves dualistically. Rituals, specifically, are dramatic events that combine disharmonious and harmonious social processes - juxtaposing the powerlessness of workers (on farms), and the deep sense of belonging and place in the SRV. I argue that the deep historical connections in the SRV have largely been ignored by conservationists in the drive to establish new protected zones (such as the Greater Addo Elephant National Park), and that a new model of shared conservation management is needed for this Park.
- Full Text:
- Date Issued: 2007
Masculinity, citizenship and political objection to compulsory military service in the South African Defence Force, 1978-1990
- Authors: Conway, Daniel John
- Date: 2013-08-15
- Subjects: Conscientious objectors -- South Africa End Conscription Campaign (South Africa) National service -- South Africa Draft -- South Africa South Africa -- Military policy Masculinity -- South Africa South Africa. South African Defense Force Gays in the military -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2601 , http://hdl.handle.net/10962/d1008383
- Description: This thesis conceptualises compulsory military service and objection to it as public performative acts that generate gendered and political identity. Conscription was the primary performance of citizenship and masculinity for white men in apartheid South Africa. Conscription was also a key governance strategy both in terms of upholding the authority of the state and in engendering discipline in the white population. Objection to military service was therefore a destabilising and transgressive public act. Competing conceptualisations of masculinity and citizenship are inherent in pro and anti-conscription discourses. The refusal to undertake military service places men outside the accepted means of graduating to ' real' manhood and patriotic citizenship. Although objection can be an iconic and transgressive act, objectors have an essentially ambivalent subjectivity in the public realm. Objectors are 'strangers' in a socially constructed and gendered binary of 'insiders' and 'outsiders' . This ambivalent status creates opportunities but also constraints for the performance of objection. The thesis analyses the effectiveness of objectors' performances and argues that there is a distinction between a radical challenge to hegemonic conceptions of militarised masculinity and citizenship and assimilatory challenges. The tension between radicalism and assimilation comes to the fore in response to the state's attacks on objectors. The militarised apartheid state is defined as not only masculine but heteronormative terms and it is the deployment of sexuality that is its most effective means of stigmatising and restricting the performance of objection. The thesis uses interview material, archival data and case studies and concludes that objectors (and their supporters) weaved multiple narratives into their performances but that as the 1980s progressed, the performance of objection to conscription became assimilatory and this demonstrates the heteronormativity of the state, military service and the public realm. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Authors: Conway, Daniel John
- Date: 2013-08-15
- Subjects: Conscientious objectors -- South Africa End Conscription Campaign (South Africa) National service -- South Africa Draft -- South Africa South Africa -- Military policy Masculinity -- South Africa South Africa. South African Defense Force Gays in the military -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2601 , http://hdl.handle.net/10962/d1008383
- Description: This thesis conceptualises compulsory military service and objection to it as public performative acts that generate gendered and political identity. Conscription was the primary performance of citizenship and masculinity for white men in apartheid South Africa. Conscription was also a key governance strategy both in terms of upholding the authority of the state and in engendering discipline in the white population. Objection to military service was therefore a destabilising and transgressive public act. Competing conceptualisations of masculinity and citizenship are inherent in pro and anti-conscription discourses. The refusal to undertake military service places men outside the accepted means of graduating to ' real' manhood and patriotic citizenship. Although objection can be an iconic and transgressive act, objectors have an essentially ambivalent subjectivity in the public realm. Objectors are 'strangers' in a socially constructed and gendered binary of 'insiders' and 'outsiders' . This ambivalent status creates opportunities but also constraints for the performance of objection. The thesis analyses the effectiveness of objectors' performances and argues that there is a distinction between a radical challenge to hegemonic conceptions of militarised masculinity and citizenship and assimilatory challenges. The tension between radicalism and assimilation comes to the fore in response to the state's attacks on objectors. The militarised apartheid state is defined as not only masculine but heteronormative terms and it is the deployment of sexuality that is its most effective means of stigmatising and restricting the performance of objection. The thesis uses interview material, archival data and case studies and concludes that objectors (and their supporters) weaved multiple narratives into their performances but that as the 1980s progressed, the performance of objection to conscription became assimilatory and this demonstrates the heteronormativity of the state, military service and the public realm. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
The role of GMSA to assist their suppliers with the successful implementation of lean practices
- Authors: Conybeare, Nabiel
- Date: 2007
- Subjects: General Motors (South Africa) , Production management -- South Africa , Business logistics -- Management , Automobile industry and trade -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8742 , http://hdl.handle.net/10948/763 , General Motors (South Africa) , Production management -- South Africa , Business logistics -- Management , Automobile industry and trade -- Management
- Description: Over the past couple of decades traditional manufacturing techniques have been replaced by lean production around the world. This change in production methodology brought about the opportunity for numerous companies to reduce costs and customer lead time through the application of this lean philosophy. The worldwide shift from traditional manufacturing to lean manufacturing can be ascribed to the success of Toyota Motor Company. Lean manufacturing refers to a manufacturing improvement process in order to minimize or eliminate waste while maximizing production flow (Tapping, et al., 2002:30). A value stream includes all the operations and processes to transform raw material into finished products or services. Value stream is a management tool used for the planning of a production process involving lean techniques through systematic data capturing and analysis (Tapping 2002 et al., 41). Value stream is a proven process for planning the improvements that will allow companies to develop lean practices. One key to Toyota’s success that GMSA and many other South African companies have not been able to emulate is the transformation of their suppliers to apply the lean philosophy. This lack of supplier transformation is due to various reasons including supplier proximity, supplier relationships, supplier performance levels, and the ordering policies used for supplied parts. Even though many manufacturing organizations realize the importance of practicing lean manufacturing techniques, few organizations apply lean techniques with the required knowledge and tools to transform their organization from traditional manufacturing to lean manufacturing. This research project is based purely on the lean manufacturing principles and philosophies. The aim of the study is to make GMSA’s suppliers aware of the principles and processes of lean manufacturing and to develop a lean implementation strategy to assist organizations with the successful implementation of lean practices. In order to correctly implement and sustain lean manufacturing practices this study will also focus on supplier support and development and the behavior an organization must exhibit to make this transformation a success. The research methodology comprised the following steps: • A literature study was performed by the researcher to get a better understanding of the principles and philosophies of lean manufacturing; • A second literature study was also performed to get a better understanding of the continuous improvement philosophies of lean manufacturing including supplier support & development; and • To accomplish the objectives of this study, interview sessions were conducted with four senior managers of General Motors South Africa. The researcher selected the interviewees from the following departments within General Motors South Africa: Global Purchasing and Supply Chain; Supplier Quality and Development; Vehicle Assembly Operations and Material Supply. The interviewees from General Motors South Africa were identified as qualified data sources for this research project, as their professional opinions and viewpoints could best address the research questions.
- Full Text:
- Date Issued: 2007
- Authors: Conybeare, Nabiel
- Date: 2007
- Subjects: General Motors (South Africa) , Production management -- South Africa , Business logistics -- Management , Automobile industry and trade -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8742 , http://hdl.handle.net/10948/763 , General Motors (South Africa) , Production management -- South Africa , Business logistics -- Management , Automobile industry and trade -- Management
- Description: Over the past couple of decades traditional manufacturing techniques have been replaced by lean production around the world. This change in production methodology brought about the opportunity for numerous companies to reduce costs and customer lead time through the application of this lean philosophy. The worldwide shift from traditional manufacturing to lean manufacturing can be ascribed to the success of Toyota Motor Company. Lean manufacturing refers to a manufacturing improvement process in order to minimize or eliminate waste while maximizing production flow (Tapping, et al., 2002:30). A value stream includes all the operations and processes to transform raw material into finished products or services. Value stream is a management tool used for the planning of a production process involving lean techniques through systematic data capturing and analysis (Tapping 2002 et al., 41). Value stream is a proven process for planning the improvements that will allow companies to develop lean practices. One key to Toyota’s success that GMSA and many other South African companies have not been able to emulate is the transformation of their suppliers to apply the lean philosophy. This lack of supplier transformation is due to various reasons including supplier proximity, supplier relationships, supplier performance levels, and the ordering policies used for supplied parts. Even though many manufacturing organizations realize the importance of practicing lean manufacturing techniques, few organizations apply lean techniques with the required knowledge and tools to transform their organization from traditional manufacturing to lean manufacturing. This research project is based purely on the lean manufacturing principles and philosophies. The aim of the study is to make GMSA’s suppliers aware of the principles and processes of lean manufacturing and to develop a lean implementation strategy to assist organizations with the successful implementation of lean practices. In order to correctly implement and sustain lean manufacturing practices this study will also focus on supplier support and development and the behavior an organization must exhibit to make this transformation a success. The research methodology comprised the following steps: • A literature study was performed by the researcher to get a better understanding of the principles and philosophies of lean manufacturing; • A second literature study was also performed to get a better understanding of the continuous improvement philosophies of lean manufacturing including supplier support & development; and • To accomplish the objectives of this study, interview sessions were conducted with four senior managers of General Motors South Africa. The researcher selected the interviewees from the following departments within General Motors South Africa: Global Purchasing and Supply Chain; Supplier Quality and Development; Vehicle Assembly Operations and Material Supply. The interviewees from General Motors South Africa were identified as qualified data sources for this research project, as their professional opinions and viewpoints could best address the research questions.
- Full Text:
- Date Issued: 2007
"He and His Man": allegory and catachresis in J. M. Coetzee's Nobel Lecture
- Authors: Cornwell, Gareth D N
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:2261 , http://hdl.handle.net/10962/d1004619
- Description: This essay offers a reading of J.M. Coetzee's 2003 Nobel Lecture, "He and His Man," a narrative featuring the characters of Robinson Crusoe and Daniel Defoe that borrows extensively from Defoe's Journal of the Plague Year (1722) and Tour through the Whole Island of Great Britain (1724-26). In it Coetzee whimsically explores several concerns of central importance for the activities of reading and writing, most notably the seemingly unavoidable (though ostensibly disabling) phenomenon of displacement or substitution that -- at its most generalizable level -- is best characterized as catachresis.
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- Date Issued: 2007
- Authors: Cornwell, Gareth D N
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:2261 , http://hdl.handle.net/10962/d1004619
- Description: This essay offers a reading of J.M. Coetzee's 2003 Nobel Lecture, "He and His Man," a narrative featuring the characters of Robinson Crusoe and Daniel Defoe that borrows extensively from Defoe's Journal of the Plague Year (1722) and Tour through the Whole Island of Great Britain (1724-26). In it Coetzee whimsically explores several concerns of central importance for the activities of reading and writing, most notably the seemingly unavoidable (though ostensibly disabling) phenomenon of displacement or substitution that -- at its most generalizable level -- is best characterized as catachresis.
- Full Text:
- Date Issued: 2007
An examination of internet usage patterns by mature travellers
- Authors: Correia, Sérgio Barradas
- Date: 2007
- Subjects: Tourism -- Marketing , Internet marketing , Internet users , Older people -- Travel , Older consumers -- Travel
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1194 , http://hdl.handle.net/10962/d1008182 , Tourism -- Marketing , Internet marketing , Internet users , Older people -- Travel , Older consumers -- Travel
- Description: The tourism industry has been identified as the industry with the most potential to create jobs and contribute largely to economic growth. In order to live up to this potential, tourism businesses need to create tourism products for potential tourists which need to be promoted successfully through a number of mediums. The use of the Internet as a medium for promoting and selling tourism products is increasing, however, in order for tourism businesses to successfully promote the tourism product through the Internet, they have to understand the needs and wants of their current and potential target markets. One segment of the tourism market that has come under increasing attention is the mature traveller market. This market is defined as travellers who are 50 years of age and older. Generally, the mature traveller market is viewed as a small homogenous group of old consumers with little or no spending power. However, evidence suggests that this market is comprised of an increasing number of diverse people, who use the Internet and like to spend on tourism products. Therefore, this research will examine differences between Internet users and Internet non-users in the mature traveller market. Specific attention will be paid to investigate differences in demographic, socioeconomic, Internet use and travel-related characteristics. The identification of these characteristics will enable a profile to be d~veloped for each group, which can be used by tourism businesses to effectively promote tourism products over the Internet to the mature market In order to collect data from potential respondents, a questionnaire which was used in a similar study conducted in the US was used. Data was collected using a convenience sample of Internet users and Internet non-users from the Eastern Cape and Gauteng provinces of South Africa. Cronbach alpha and factor analysis were used to assess the reliability and validity of the research instrument and measurement scales. In order to test whether differences did exist between the two groups the Chi-square and t-test statistics were used. Finally in order to examine which factors where influential in differentiating between Internet users and Internet non-users discriminant analysis was employed. The findings in the present study suggest that there are significant differences in demographics, socioeconomic, Internet use and travel-related characteristics between Internet users and Internet non-users in the mature market. By understanding the differences between Internet users and Internet non-users, tourism businesses can identify marketing strategies that appeal to mature travellers who use the Internet and to those do not, by utilising information gathered from Internet users and Internet non-users demographic, socio-economic and travel-related characteristics.
- Full Text:
- Date Issued: 2007
- Authors: Correia, Sérgio Barradas
- Date: 2007
- Subjects: Tourism -- Marketing , Internet marketing , Internet users , Older people -- Travel , Older consumers -- Travel
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1194 , http://hdl.handle.net/10962/d1008182 , Tourism -- Marketing , Internet marketing , Internet users , Older people -- Travel , Older consumers -- Travel
- Description: The tourism industry has been identified as the industry with the most potential to create jobs and contribute largely to economic growth. In order to live up to this potential, tourism businesses need to create tourism products for potential tourists which need to be promoted successfully through a number of mediums. The use of the Internet as a medium for promoting and selling tourism products is increasing, however, in order for tourism businesses to successfully promote the tourism product through the Internet, they have to understand the needs and wants of their current and potential target markets. One segment of the tourism market that has come under increasing attention is the mature traveller market. This market is defined as travellers who are 50 years of age and older. Generally, the mature traveller market is viewed as a small homogenous group of old consumers with little or no spending power. However, evidence suggests that this market is comprised of an increasing number of diverse people, who use the Internet and like to spend on tourism products. Therefore, this research will examine differences between Internet users and Internet non-users in the mature traveller market. Specific attention will be paid to investigate differences in demographic, socioeconomic, Internet use and travel-related characteristics. The identification of these characteristics will enable a profile to be d~veloped for each group, which can be used by tourism businesses to effectively promote tourism products over the Internet to the mature market In order to collect data from potential respondents, a questionnaire which was used in a similar study conducted in the US was used. Data was collected using a convenience sample of Internet users and Internet non-users from the Eastern Cape and Gauteng provinces of South Africa. Cronbach alpha and factor analysis were used to assess the reliability and validity of the research instrument and measurement scales. In order to test whether differences did exist between the two groups the Chi-square and t-test statistics were used. Finally in order to examine which factors where influential in differentiating between Internet users and Internet non-users discriminant analysis was employed. The findings in the present study suggest that there are significant differences in demographics, socioeconomic, Internet use and travel-related characteristics between Internet users and Internet non-users in the mature market. By understanding the differences between Internet users and Internet non-users, tourism businesses can identify marketing strategies that appeal to mature travellers who use the Internet and to those do not, by utilising information gathered from Internet users and Internet non-users demographic, socio-economic and travel-related characteristics.
- Full Text:
- Date Issued: 2007
Clients' views on construction and design team competencies
- Authors: Crafford, Gerrit Jacobus
- Date: 2007
- Subjects: Construction industry -- Employees , Core competencies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9679 , http://hdl.handle.net/10948/490 , Construction industry -- Employees , Core competencies
- Description: The effectiveness of the design and construction team in meeting clients’ requirements entirely depends on the competency proficiency of the design and construction teams. This research presents a model of the important competencies required by the design and construction teams in order to provide a competent service as seen by the client. A review of related literature followed by interviews by selected practitioners yielded 29 architectural competencies, 31 civil engineering competencies, 32 construction management competencies, 31 project management competencies, and 33 quantity surveying competencies that were presented in a structured questionnaire. The questionnaire was completed by 52 developers from a census of developers and municipality managers in South Africa. Respondents were asked to rank or rate: the level of importance of each competency for a career in that specific discipline; how evident that competency is in the specific discipline in South Africa; the level of importance of the performance parameters to clients, and the extent to which the various disciplines realise client satisfaction relative to the various performance parameters. The techniques of re-scaling, principal component analysis, content analysis, ranking and quadrant analysis were applied to the data. Results showed a high degree of consistency among respondents in all disciplines, regardless of the demographic differences in the importance of the competencies. A factor solution was obtained for every discipline using principal component analysis on the important competencies of each discipline. The various factor solutions were in turn used to formulate a simplified model. The model shows that the factors are interdependent and interacting. The model indicates that primary competencies for each profession are supported by mostly secondary competencies. These factors v are in turn influenced by the inter-relationships between the practitioners, continued professional development/ research and universities, which are then in turn, influenced the governing bodies. The local and global environment then ultimately influences the governing bodies. An Importance-Evidence quadrant analysis was undertaken in order to integrate the rankings of the current importance levels and current proficiency levels for each discipline’s competencies, which helped to identify areas in which education and training is immediately needed. Respondents ranked all nine performance parameters above average which indicates that there are more than the traditional performance parameters of cost, quality, and time involved in satisfying clients. The research concluded that vital feedback from clients regarding the competencies required by the respective professionals in the design and construction team was obtained.
- Full Text:
- Date Issued: 2007
- Authors: Crafford, Gerrit Jacobus
- Date: 2007
- Subjects: Construction industry -- Employees , Core competencies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9679 , http://hdl.handle.net/10948/490 , Construction industry -- Employees , Core competencies
- Description: The effectiveness of the design and construction team in meeting clients’ requirements entirely depends on the competency proficiency of the design and construction teams. This research presents a model of the important competencies required by the design and construction teams in order to provide a competent service as seen by the client. A review of related literature followed by interviews by selected practitioners yielded 29 architectural competencies, 31 civil engineering competencies, 32 construction management competencies, 31 project management competencies, and 33 quantity surveying competencies that were presented in a structured questionnaire. The questionnaire was completed by 52 developers from a census of developers and municipality managers in South Africa. Respondents were asked to rank or rate: the level of importance of each competency for a career in that specific discipline; how evident that competency is in the specific discipline in South Africa; the level of importance of the performance parameters to clients, and the extent to which the various disciplines realise client satisfaction relative to the various performance parameters. The techniques of re-scaling, principal component analysis, content analysis, ranking and quadrant analysis were applied to the data. Results showed a high degree of consistency among respondents in all disciplines, regardless of the demographic differences in the importance of the competencies. A factor solution was obtained for every discipline using principal component analysis on the important competencies of each discipline. The various factor solutions were in turn used to formulate a simplified model. The model shows that the factors are interdependent and interacting. The model indicates that primary competencies for each profession are supported by mostly secondary competencies. These factors v are in turn influenced by the inter-relationships between the practitioners, continued professional development/ research and universities, which are then in turn, influenced the governing bodies. The local and global environment then ultimately influences the governing bodies. An Importance-Evidence quadrant analysis was undertaken in order to integrate the rankings of the current importance levels and current proficiency levels for each discipline’s competencies, which helped to identify areas in which education and training is immediately needed. Respondents ranked all nine performance parameters above average which indicates that there are more than the traditional performance parameters of cost, quality, and time involved in satisfying clients. The research concluded that vital feedback from clients regarding the competencies required by the respective professionals in the design and construction team was obtained.
- Full Text:
- Date Issued: 2007
The impact of load and frequency on the biomechanical, physiological and perceptual responses to dynamic pushing
- Authors: Cripwell, Adam Michael
- Date: 2007
- Subjects: Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5144 , http://hdl.handle.net/10962/d1008183 , Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Description: The objective of the present research was to establish the biomechanical, physiological and perceptual responses of male operators to dynamic pushing tasks. The pushing tasks were performed using an industrial pallet jack with varying load/frequency combinations, in a controlled laboratory environment. Thirty healthy male subjects comprised the sample. Experimental procedures were conducted utilising the Chatillon ™ Dynamometer to measure force output in the initial, sustained and ending phases. The K4b2 Ergospirometer was used to assess physiological responses (heart rate and oxygen consumption [V02])' Nine recorded forces and nine experimental conditions formed the basis of this study, with subjects required to push three loads (200kg, 350kg, 500kg) at three frequencies (1120 sec, 1/40 sec, 1/60 sec) at a speed of 3.6km.h-1 over 14 metres on a co-efficient of friction controlled walkway for six minutes. Gait analysis, along with perceptions of exertion (,Central ' and 'Local' RPE) were collected during the third and sixth minutes of each condition . Body discomfort and contribution were identified upon completion of each condition. The results demonstrated that load and frequency interacted to influence responses within each domain. Increasing loads required increased force output during each stage of the push, which had a concomitant effect on physiological and perceptual responses. Significant differences arose between the initial, sustained and ending forces for each load, showing the direct relationship between load and force exertion. The combination of heaviest load/quickest frequency required the greatest physiological output, exceeding recommended guidelines for heart rate, V02 and energy expenditure responses. Intermediate combinations required moderate and acceptable energy cost. Linear relationships were established between heart rate and oxygen consumption , as well as between load and V02 , thus providing industrial practitioners an opportunity to evaluate task demands in situ. The combination of high forces and elevated physiological responses increased the subjective rating of the condition. The results emphasise the need to holistically consider all contributing factors in a dynamic pushing task. Dynamic pushing tasks place biomechanical, physiological and perceptual demands on the human operator, which must be minimised in order to ensure that this form of manual materials handling becomes sustainable in the long term.
- Full Text:
- Date Issued: 2007
- Authors: Cripwell, Adam Michael
- Date: 2007
- Subjects: Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5144 , http://hdl.handle.net/10962/d1008183 , Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Description: The objective of the present research was to establish the biomechanical, physiological and perceptual responses of male operators to dynamic pushing tasks. The pushing tasks were performed using an industrial pallet jack with varying load/frequency combinations, in a controlled laboratory environment. Thirty healthy male subjects comprised the sample. Experimental procedures were conducted utilising the Chatillon ™ Dynamometer to measure force output in the initial, sustained and ending phases. The K4b2 Ergospirometer was used to assess physiological responses (heart rate and oxygen consumption [V02])' Nine recorded forces and nine experimental conditions formed the basis of this study, with subjects required to push three loads (200kg, 350kg, 500kg) at three frequencies (1120 sec, 1/40 sec, 1/60 sec) at a speed of 3.6km.h-1 over 14 metres on a co-efficient of friction controlled walkway for six minutes. Gait analysis, along with perceptions of exertion (,Central ' and 'Local' RPE) were collected during the third and sixth minutes of each condition . Body discomfort and contribution were identified upon completion of each condition. The results demonstrated that load and frequency interacted to influence responses within each domain. Increasing loads required increased force output during each stage of the push, which had a concomitant effect on physiological and perceptual responses. Significant differences arose between the initial, sustained and ending forces for each load, showing the direct relationship between load and force exertion. The combination of heaviest load/quickest frequency required the greatest physiological output, exceeding recommended guidelines for heart rate, V02 and energy expenditure responses. Intermediate combinations required moderate and acceptable energy cost. Linear relationships were established between heart rate and oxygen consumption , as well as between load and V02 , thus providing industrial practitioners an opportunity to evaluate task demands in situ. The combination of high forces and elevated physiological responses increased the subjective rating of the condition. The results emphasise the need to holistically consider all contributing factors in a dynamic pushing task. Dynamic pushing tasks place biomechanical, physiological and perceptual demands on the human operator, which must be minimised in order to ensure that this form of manual materials handling becomes sustainable in the long term.
- Full Text:
- Date Issued: 2007