The relationship between leadership, group identity and intention to attend: the case of Buffalo City Metropolitan Municipality in Eastern Cape Province of South Africa
- Authors: Mazantsana, Pumla
- Date: 2018
- Subjects: Leadership -- South Africa -- Research , Labor turnover -- South Africa -- Buffalo City Metropolitan Municipality Absenteeism (Labor) -- South Africa -- Buffalo City Metropolitan Municipality
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/32741 , vital:32340
- Description: The study investigated the relationship between leadership, group identity and intention to attend; among a sample of employees in the Buffalo City Metropolitan Municipality. Since it is a common occurrence that public entities in South Africa are faced with high labour turnover and absenteeism as a result of failure to attend, strategies are required that will assist in reducing this challenging issue. The expectation is that by virtue of the leadership authorities and responsibilities, they play an important in the effective functioning of such public entities.
- Full Text:
- Date Issued: 2018
- Authors: Mazantsana, Pumla
- Date: 2018
- Subjects: Leadership -- South Africa -- Research , Labor turnover -- South Africa -- Buffalo City Metropolitan Municipality Absenteeism (Labor) -- South Africa -- Buffalo City Metropolitan Municipality
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/32741 , vital:32340
- Description: The study investigated the relationship between leadership, group identity and intention to attend; among a sample of employees in the Buffalo City Metropolitan Municipality. Since it is a common occurrence that public entities in South Africa are faced with high labour turnover and absenteeism as a result of failure to attend, strategies are required that will assist in reducing this challenging issue. The expectation is that by virtue of the leadership authorities and responsibilities, they play an important in the effective functioning of such public entities.
- Full Text:
- Date Issued: 2018
Statistical methods for the detection of non-technical losses: a case study for the Nelson Mandela Bay Municipality
- Authors: Pazi, Sisa
- Date: 2017
- Subjects: Nonparametric statistics Mathematical statistics , Statistics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/19706 , vital:28939
- Description: Electricity is one of the most stolen commodities in the world. Electricity theft can be defined as the criminal act of stealing electrical power. Several types of electricity theft exist, including illegal connections and bypassing and tampering with energy meters. The negative financial impacts, due to lost revenue, of electricity theft are far reaching and affect both developing and developed countries. . Here in South Africa, Eskom loses over R2 Billion annually due to electricity theft. Data mining and nonparametric statistical methods have been used to detect fraudulent usage of electricity by assessing abnormalities and abrupt changes in kilowatt hour (kWh) consumption patterns. Identifying effective measures to detect fraudulent electricity usage is an active area of research in the electrical domain. In this study, Support Vector Machines (SVM), Naïve Bayes (NB) and k-Nearest Neighbour (KNN) algorithms were used to design and propose an electricity fraud detection model. Using the Nelson Mandela Bay Municipality as a case study, three classifiers were built with SVM, NB and KNN algorithms. The performance of these classifiers were evaluated and compared.
- Full Text:
- Date Issued: 2017
- Authors: Pazi, Sisa
- Date: 2017
- Subjects: Nonparametric statistics Mathematical statistics , Statistics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/19706 , vital:28939
- Description: Electricity is one of the most stolen commodities in the world. Electricity theft can be defined as the criminal act of stealing electrical power. Several types of electricity theft exist, including illegal connections and bypassing and tampering with energy meters. The negative financial impacts, due to lost revenue, of electricity theft are far reaching and affect both developing and developed countries. . Here in South Africa, Eskom loses over R2 Billion annually due to electricity theft. Data mining and nonparametric statistical methods have been used to detect fraudulent usage of electricity by assessing abnormalities and abrupt changes in kilowatt hour (kWh) consumption patterns. Identifying effective measures to detect fraudulent electricity usage is an active area of research in the electrical domain. In this study, Support Vector Machines (SVM), Naïve Bayes (NB) and k-Nearest Neighbour (KNN) algorithms were used to design and propose an electricity fraud detection model. Using the Nelson Mandela Bay Municipality as a case study, three classifiers were built with SVM, NB and KNN algorithms. The performance of these classifiers were evaluated and compared.
- Full Text:
- Date Issued: 2017
Investigating issues adversely affecting Grade 9 learner performance in the Natural Sciences in selected schools in the Cofimvaba District
- Authors: Hlalukana, Sibonginkosi
- Date: 2013
- Subjects: Science -- Study and teaching (Secondary) -- South Africa , Competency-based education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9465 , http://hdl.handle.net/10948/d1020821
- Description: South Africa faces a deepening crisis due to underachievement in science at secondary school level. High failure rates in science at Grade 12 have resulted in the subject being an unpopular choice in the Cofimvaba District, resulting in fewer learners electing to take the subject at Further Education and Training (FET) level. As a result acute shortages of scientific oriented professionals such as engineers, technologists, skilled artisans, technicians, doctors and chartered accountants derail the development of South Africa. Hence, this study seeks to investigate issues that affect Grade 9 learner performance in the Natural Sciences in the Cofimvaba District. A qualitative research design using observations and interviews with learners and teachers as instruments were conducted to gain an insight into the barriers to teaching and learning in South African rural schools. The findings of this study reveal direct and indirect factors commensurate with the findings of Mji and Makgato (2006:264). They included: classroom climate, the Language of Teaching and Learning (LoLT) in Natural Science classrooms, practical work, teacher subject specialisation and the socio-economic background of the learners. Based on the findings of this study it can be concluded that the quality of teachers, a lack of resources, neglect of the practical component, home conditions and parental absence all contribute as barriers to learner performance in the Natural Sciences.
- Full Text:
- Date Issued: 2013
- Authors: Hlalukana, Sibonginkosi
- Date: 2013
- Subjects: Science -- Study and teaching (Secondary) -- South Africa , Competency-based education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9465 , http://hdl.handle.net/10948/d1020821
- Description: South Africa faces a deepening crisis due to underachievement in science at secondary school level. High failure rates in science at Grade 12 have resulted in the subject being an unpopular choice in the Cofimvaba District, resulting in fewer learners electing to take the subject at Further Education and Training (FET) level. As a result acute shortages of scientific oriented professionals such as engineers, technologists, skilled artisans, technicians, doctors and chartered accountants derail the development of South Africa. Hence, this study seeks to investigate issues that affect Grade 9 learner performance in the Natural Sciences in the Cofimvaba District. A qualitative research design using observations and interviews with learners and teachers as instruments were conducted to gain an insight into the barriers to teaching and learning in South African rural schools. The findings of this study reveal direct and indirect factors commensurate with the findings of Mji and Makgato (2006:264). They included: classroom climate, the Language of Teaching and Learning (LoLT) in Natural Science classrooms, practical work, teacher subject specialisation and the socio-economic background of the learners. Based on the findings of this study it can be concluded that the quality of teachers, a lack of resources, neglect of the practical component, home conditions and parental absence all contribute as barriers to learner performance in the Natural Sciences.
- Full Text:
- Date Issued: 2013
Feeding ecology and dietary patterns of the Indo-Pacific bottlenose dolphin (Tursiops Aduncus) off KwaZulu-Natal, South Africa
- Authors: Kaiser, Sabina Marie Luise
- Date: 2012
- Subjects: Bottlenose dolphin -- Ecology -- South Africa -- KwaZulu-Natal , Bottlenose dolphin -- Feeding and feeds -- South Africa -- KwaZulu-Natal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10710 , http://hdl.handle.net/10948/d1011509 , Bottlenose dolphin -- Ecology -- South Africa -- KwaZulu-Natal , Bottlenose dolphin -- Feeding and feeds -- South Africa -- KwaZulu-Natal
- Description: The Indo-Pacific bottlenose dolphin (Tursiops aduncus) is a common top predator along the KwaZulu-Natal coast. There have been several dietary studies done on this species, most of which have classed this predator as an opportunistic feeder preying on the most abundant prey species in that area. In KwaZulu-Natal (KZN) a dietary study was carried out in 1990, but there have been no followup studies to examine potential changes in diet. A number of bottlenose dolphins get entangled in the shark-nets set off the KZN coast each year. These dolphins provide a valuable source of information about different aspects of the ecology of this population. The aim of this study was to examine the diet of bottlenose dolphins off the KwaZulu-Natal coast with particular emphasis on temporal change in diet composition. The contents of 102 stomachs of bottlenose dolphins (58 females, 44 males) accidentally caught in the shark nets between 1985 and 2010 were analysed, and compared to historical data from dolphins caught between 1975 and 1986. A total of 94 different prey species from 37 families (32 fish families, five cephalopod families) were identified in the stomach contents. Teleosts made up the most important prey group in numbers and weight constituting 84 percent and 67 percent, respectively, while cephalopods made up 15 percent of the number and 30 percent of the weight of the prey items. Multi Dimensional Scaling (MDS) indicated that there is no resource partitioning between males and females, but significant partitioning between juveniles and adults. Six prey species contributed more than 60 percent of the weight of all prey species in the diet. These species are the most important according to their calculated index of relative importance score and are, in order of importance: Sepia sp. (cuttlefish)., Pomadasys olivaceus (piggy), Trachurus delagoa (maasbanker), Scomber japonicus (mackeral), Loligo sp. (squid). and Pagellus bellottii natalensis (pandora or red tjor-tjor). When compared to historic data, no changes in the main prey species has occurred, but the piggy has decreased in importance (1976-1986 percent IRI=45; 2000-2010 percent IRI=22), while the maasbanker has increased (1975-1986, percent RI=4; 2000-2010 percent RI=20). Stable carbon and nitrogen isotope analysis performed on tissue from the teeth of T. aduncus caught in the shark nets between 1970 and 2010 showed that there has been no significant shift in trophic level (δ15N) or in primary prey source (δ13C) over this time. The isotopic signatures of different tissues from an individual were used to create a base line and describe the differences in tissue signatures. Blubber was found to be significantly different from skin and muscle, which were found to be isotopically similar. Skin from remote biopsies can therefore probably be used in place of muscle for isotopic studies of bottlenose dolphins, while caution should be taken when using blubber. Given that T. aduncus is still listed as “data deficient” by the International Union for the Conservation of Nature (IUCN), and the potential for climate change and expanding fisheries to alter the distribution and abundance of their prey species, long term dietary studies such as this are important in order for their effective conservation and management.
- Full Text:
- Date Issued: 2012
- Authors: Kaiser, Sabina Marie Luise
- Date: 2012
- Subjects: Bottlenose dolphin -- Ecology -- South Africa -- KwaZulu-Natal , Bottlenose dolphin -- Feeding and feeds -- South Africa -- KwaZulu-Natal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10710 , http://hdl.handle.net/10948/d1011509 , Bottlenose dolphin -- Ecology -- South Africa -- KwaZulu-Natal , Bottlenose dolphin -- Feeding and feeds -- South Africa -- KwaZulu-Natal
- Description: The Indo-Pacific bottlenose dolphin (Tursiops aduncus) is a common top predator along the KwaZulu-Natal coast. There have been several dietary studies done on this species, most of which have classed this predator as an opportunistic feeder preying on the most abundant prey species in that area. In KwaZulu-Natal (KZN) a dietary study was carried out in 1990, but there have been no followup studies to examine potential changes in diet. A number of bottlenose dolphins get entangled in the shark-nets set off the KZN coast each year. These dolphins provide a valuable source of information about different aspects of the ecology of this population. The aim of this study was to examine the diet of bottlenose dolphins off the KwaZulu-Natal coast with particular emphasis on temporal change in diet composition. The contents of 102 stomachs of bottlenose dolphins (58 females, 44 males) accidentally caught in the shark nets between 1985 and 2010 were analysed, and compared to historical data from dolphins caught between 1975 and 1986. A total of 94 different prey species from 37 families (32 fish families, five cephalopod families) were identified in the stomach contents. Teleosts made up the most important prey group in numbers and weight constituting 84 percent and 67 percent, respectively, while cephalopods made up 15 percent of the number and 30 percent of the weight of the prey items. Multi Dimensional Scaling (MDS) indicated that there is no resource partitioning between males and females, but significant partitioning between juveniles and adults. Six prey species contributed more than 60 percent of the weight of all prey species in the diet. These species are the most important according to their calculated index of relative importance score and are, in order of importance: Sepia sp. (cuttlefish)., Pomadasys olivaceus (piggy), Trachurus delagoa (maasbanker), Scomber japonicus (mackeral), Loligo sp. (squid). and Pagellus bellottii natalensis (pandora or red tjor-tjor). When compared to historic data, no changes in the main prey species has occurred, but the piggy has decreased in importance (1976-1986 percent IRI=45; 2000-2010 percent IRI=22), while the maasbanker has increased (1975-1986, percent RI=4; 2000-2010 percent RI=20). Stable carbon and nitrogen isotope analysis performed on tissue from the teeth of T. aduncus caught in the shark nets between 1970 and 2010 showed that there has been no significant shift in trophic level (δ15N) or in primary prey source (δ13C) over this time. The isotopic signatures of different tissues from an individual were used to create a base line and describe the differences in tissue signatures. Blubber was found to be significantly different from skin and muscle, which were found to be isotopically similar. Skin from remote biopsies can therefore probably be used in place of muscle for isotopic studies of bottlenose dolphins, while caution should be taken when using blubber. Given that T. aduncus is still listed as “data deficient” by the International Union for the Conservation of Nature (IUCN), and the potential for climate change and expanding fisheries to alter the distribution and abundance of their prey species, long term dietary studies such as this are important in order for their effective conservation and management.
- Full Text:
- Date Issued: 2012
From physics to music: an analysis of the role of overtones in the improvement of choral tone
- Authors: Starker, Leonard Bonn
- Date: 2011
- Subjects: Choral singing , Choral singing -- Intonation , Choral singing -- Instruction and study , Voice culture
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8518 , http://hdl.handle.net/10948/d1012937
- Description: Numerous studies exist examining the link in solo singers between timbre and overtone spectra. The purpose of this study is to examine if similar results can be obtained by applying the same techniques to choral singing. The study is aimed at non-scientific readers and therefore introduces the subject with background to the relevant physics. In this study a number of recorded samples of choirs were taken from www.youtube.com and analyzed. The analysis included computation of long-term average spectra (LTAS) and singing power ratio‟s (SPR), which provided an indication of the relative energy in the higher overtone region of every choir. This was compared to a binary value judgment of the choirs. The results indicate that the SPR as applied to soloists cannot be directly applied to choirs. A link between SPR and a perceived “good” choral tone could exist but would have to be interpreted differently than in the case of soloists. It was also found that a possible link could exist between frequency peaks in LTAS and a choir‟s intonation.
- Full Text:
- Date Issued: 2011
- Authors: Starker, Leonard Bonn
- Date: 2011
- Subjects: Choral singing , Choral singing -- Intonation , Choral singing -- Instruction and study , Voice culture
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8518 , http://hdl.handle.net/10948/d1012937
- Description: Numerous studies exist examining the link in solo singers between timbre and overtone spectra. The purpose of this study is to examine if similar results can be obtained by applying the same techniques to choral singing. The study is aimed at non-scientific readers and therefore introduces the subject with background to the relevant physics. In this study a number of recorded samples of choirs were taken from www.youtube.com and analyzed. The analysis included computation of long-term average spectra (LTAS) and singing power ratio‟s (SPR), which provided an indication of the relative energy in the higher overtone region of every choir. This was compared to a binary value judgment of the choirs. The results indicate that the SPR as applied to soloists cannot be directly applied to choirs. A link between SPR and a perceived “good” choral tone could exist but would have to be interpreted differently than in the case of soloists. It was also found that a possible link could exist between frequency peaks in LTAS and a choir‟s intonation.
- Full Text:
- Date Issued: 2011
From physics to music: an analysis of the role of overtones in the improvement of choral tone
- Authors: Starker, Leonard Bonn
- Date: 2011
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8502 , http://hdl.handle.net/10948/1650
- Description: Numerous studies exist examining the link in solo singers between timbre and overtone spectra. The purpose of this study is to examine if similar results can be obtained by applying the same techniques to choral singing. The study is aimed at non-scientific readers and therefore introduces the subject with background to the relevant physics. In this study a number of recorded samples of choirs were taken from www.youtube.com and analyzed. The analysis included computation of long-term average spectra (LTAS) and singing power ratio‟s (SPR), which provided an indication of the relative energy in the higher overtone region of every choir. This was compared to a binary value judgment of the choirs. The results indicate that the SPR as applied to soloists cannot be directly applied to choirs. A link between SPR and a perceived “good” choral tone could exist but would have to be interpreted differently than in the case of soloists. It was also found that a possible link could exist between frequency peaks in LTAS and a choir's intonation.
- Full Text:
- Date Issued: 2011
- Authors: Starker, Leonard Bonn
- Date: 2011
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8502 , http://hdl.handle.net/10948/1650
- Description: Numerous studies exist examining the link in solo singers between timbre and overtone spectra. The purpose of this study is to examine if similar results can be obtained by applying the same techniques to choral singing. The study is aimed at non-scientific readers and therefore introduces the subject with background to the relevant physics. In this study a number of recorded samples of choirs were taken from www.youtube.com and analyzed. The analysis included computation of long-term average spectra (LTAS) and singing power ratio‟s (SPR), which provided an indication of the relative energy in the higher overtone region of every choir. This was compared to a binary value judgment of the choirs. The results indicate that the SPR as applied to soloists cannot be directly applied to choirs. A link between SPR and a perceived “good” choral tone could exist but would have to be interpreted differently than in the case of soloists. It was also found that a possible link could exist between frequency peaks in LTAS and a choir's intonation.
- Full Text:
- Date Issued: 2011
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