A synopsis of the Afrotropical Tricorythidae
- Authors: Barber-James, Helen M
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7003 , http://hdl.handle.net/10962/d1008362
- Description: The Tricorythidae of the Afrotropical Region is currently composed of five described genera, three of which are thought to be restricted to Madagascar (Madecassorythus Elouard and Oliarioniny, Ranorythus Oliarinony and Elouard, and Spinirythus Oliarinony and Elouard), one which is restricted to Africa (Dicercomyzon Demoulin), and one which is thought to be distributed on both landmasses (Tricorythus Eaton). Based on sexual dimorphism, manifest in the relative eye size of mature male and female nymphs and adults and on the structure of the genitalia of adult males, it is proposed that there are two additional genera in Africa, as yet undescribed. One of these genera is represented by a species currently placed in Tricorythus (T. discolor [Burmeister]). Several other undescribed species within South Africa have been identified as belonging to the group. A second lineage is represented by Tricorythus tinctus Kimmins, from Uganda, the only currently described species. There are also several more undescribed species of this group widespread in Africa.
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A tuple space web service for distributed programming-Simplifying distributed web services applications
- Authors: Wells, George C , Mueller, Barbara , Schulé, Lo¨ıc
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430437 , vital:72691 , https://www.scitepress.org/PublishedPapers/2008/15170/15170.pdf
- Description: This paper describes a new tuple space web service for coordination and communication in distributed web applications. This web service is based on the Linda programming model. Linda is a coordination lan-guage for parallel and distributed processing, providing a communica-tion mechanism based on a logically shared memory space. The origi-nal Linda model has been extended through the provision of a pro-grammable mechanism, providing additional flexibility and improved performance. The implementation of the web service is discussed, to-gether with the details of the programmable matching mechanism. Some results from the implementation of a location-based mobile appli-cation, using the tuple space web service are presented, demonstrating the benefits of our system.
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A VLBI study of OH masers in a proto-planetary nebula OH 0.9+1.3
- Authors: McAlpine, Kim
- Date: 2008
- Subjects: Very long baseline interferometry , Proto-planetary nebulae , Masers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5499 , http://hdl.handle.net/10962/d1005285 , Very long baseline interferometry , Proto-planetary nebulae , Masers
- Description: This thesis reports the calibration, imaging and analysis of one epoch of VLBA observations of the 1612 MHz OH maser emission from the protoplanetary nebula OH 0.9+1.3. These are the first polarisation VLBI observations of this source and the spatial morphology of the OH emission is resolved on this scale. Proto-planetary nebulae represent the transition phase in the evolution of stars between the asymptotic giant branch (AGB) phase and their emergence as planetary nebulae. A long-standing astronomical question is how the predominantly spherical circumstellar envelopes of AGB stars evolve into the bipolar and axisymmetric structures that are commonly observed in planetary nebula. Proto-planetary nebulae offer a unique opportunity to study this transformation process. The high-resolution VLBI maps produced in this thesis were used to investigate the morphology and kinematics of OH 0.9+1.3 with a view to gaining insight into the development of asymmetries in the circumstellar material. The OH maser emission of OH 0.9+1.3 has a double-peaked profile with one peak blue-shifted and the other red-shifted with respect to the stellar velocity. The total intensity maser maps demonstrate a considerable degree of asymmetry with the blue- and red-shifted emission located in spatially distinct regions of the envelope. The blue-shifted emission is distributed preferentially along an axis at a projected position angle of » 135± ( North through East). The morphology of this source is not consistent with the standard symmetric thin-shell model and an attempt to fit the traditional OH/IR kinematic model of a simple expanding shell to the maser components was found to be unsatisfactory. No definitive evidence of a bipolar outflow was observed either. The high degree of asymmetry observed in the source is consistent with its status as a proto-planetary nebula. The source was imaged in all four Stokes parameters and the fractional linear and circular polarisations of the maser components were derived from the Stokes parameter maps. In all except one of the components the total fractional polarisation was found to be low ( < 15%). The mean fractional linear and circular polarisation were calculated to be 5.54% and 7.11% respectively. The absence of an identifiable Zeeman pair in the Stokes V map prohibited the estimation of the magnetic field in the circumstellar envelope of this source.
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A xylem retrieval pathway in rice leaf blades – evidence of a role for endocytosis?
- Authors: Botha, Christiaan E J , Aoki, N , Scofield, G N , Liu, Lin , Furbank, R T , White, R G
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:6505 , http://hdl.handle.net/10962/d1005930 , http://dx.doi.org/10.1093/jxb/ern150
- Description: The structure and transport properties of pit membranes at the interface between the metaxylem and xylem parenchyma cells and the possible role of these pit membranes in solute transfer to the phloem was investigated. Electron microscopy revealed a fibrillar, almost tubular matrix within the pit membrane structure between the xylem vessels and xylem parenchyma of leaf blade bundles in rice (Oryza sativa). These pits are involved primarily with regulating water flux to the surrounding xylem parenchyma cells. Vascular parenchyma cells contain large mitochondrial populations, numerous dictyosomes, endomembrane complexes and vesicles in close proximity to the pit membrane. Taken collectively this suggests that endocytosis may occur at this interface. A weak solution of 5,6-carboxyfluorescein diacetate (5,6-CFDA) was applied to cut ends of leaves and after a minimum of 45 minutes, the distribution of the fluorescent cleavage product, 5,6-carboxyfluorescein (5,6-CF) was observed using confocal microscopy. Cleavage of 5,6-CFDA occurred within the xylem parenchyma cells and the non-polar 5,6-CF was then symplasmically transported to other parenchyma elements and ultimately, via numerous pore plasmodesmata, to adjacent thick-walled sieve tubes. Application of Lucifer Yellow, and, separately, Texas Red labelled dextran (10 kDa) to the transpiration stream, confirmed that these membrane-impermeant probes could only have been offloaded from the xylem via the xylem vessel-xylem parenchyma pit membranes, suggesting endocytotic transmembrane transfer of these membrane-impermeant fluorophores. Accumulation within the thick-walled sieve tubes, but not in thin-walled sieve tubes, confirms the presence of a symplasmic phloem loading pathway, via pore plasmodesmata between xylem parenchyma and thick-walled sieve tubes, but not thin-walled sieve tubes.
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Access to educational resources: illustrative examples from rural schools in the Eastern Cape Province
- Authors: Hendricks, Monica
- Date: 2008
- Language: English
- Type: Book chapter
- Identifier: vital:7020 , http://hdl.handle.net/10962/d1007200
- Description: [Introduction] This chapter looks at the causes and effects of the widely varying degree of access to material resources across schools in the Eastern Cape. Starting with a broad overview of schools and classroom resources across the whole province, I go on to examine the Grahamstown education district. I discuss the inequalities in resource provision between groupings of schools in the district: comparing independent and state schools, and also examining disparities across schools in different localities within the government sector. The role of parents in providing resources for their children’s schooling is also discussed, as are the relationships among the various participants in education, such as non-governmental organisations, officials of the Department of Education, and teachers.
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Action research on leadership style, and relationships in an East London law firm
- Authors: Stoltz, Tania
- Date: 2008
- Subjects: Action research Law offices Leadership Law firms--South Africa--East London Law offices--South Africa--East London
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:798 , http://hdl.handle.net/10962/d1004592
- Description: "Good leadership springs from a genuine passion for the work and a genuine concern for other people. Great Leaders are people who love what they do and want to share that love with others. " (Daft, 2005:20). During an informal discussion with my husband Hugo Daniels, the leader in this Action Research Case Study, it became apparent that lawyers do not attend a single module or complete a single subject during their formal training at university to obtain their law degree that is related to the field of leadership and how to lead, inspire and motivate followers. The discussion centered on the problems the leader was experiencing in his East London law firm, problems he believed to be as a result of his lack of knowledge in the field of leadership. And so this research project began. It was obvious from the start that to intervene in the firm in order to bring about change would need the participation of everyone in the firm. The first step towards facilitating change would be to change the leadership style of the director of the firm. He would be required to gain knowledge in the field of leadership and the effects that different leadership styles have on followers. At the same time staff's perception of the current leadership style would have to be determined, as well as the desired style for their leader. The research process could then begin, based on the needs expressed by the staff and with participation from all levels in the firm. The case involved 27 members of staff made up of three heads of departments, twenty three general staff members and the leader. Data was gathered through formal interviews with the leader and the heads of departments, as well as from personal journals kept by two heads of departments and the leader. General staff members were first asked to complete The Productive Practice Survey (Hall 1987) to determine their perceptions of the current leadership style in the firm and what they thought they needed from their leader if the firm is to move forward. The Productive Practice Survey (Hall 1987) was not used with the intention of gathering quantitative data, but rather as a means of gathering information of staff's perception in general while ensuring anonymity, so as to facilitate a discussion during a feedback session. The Productive Survey's (Hall 1987) content and working is explained in further detail in Chapter 3 on page 44. Initially participants were skeptical of the process and used the survey as a medium to lash out against the firm and Hugo Daniels as a leader, leaving no room for suggestions for improvement, an "it is what it is" approach. During the feedback session general staff members became more open when they realized that change would benefit them, as changes would be suggested by them and implemented with their participation. They became less reluctant about change and provided valuable input during the session. All participants understood that this Participatory Action Research intervention was only the beginning of change in the firm and the sustainability of the changes rests on the firm as a whole, and working towards it would be a continuous process not ending with the Participatory Action Research process.
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Adoption of ICTs in a marginalised area of South Africa
- Authors: Mapi, Thandeka , Dalvit, Lorenzo , Terzoli, Alfredo
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431130 , vital:72747 , https://d1wqtxts1xzle7.cloudfront.net/4390301/5-thandeka-libre.pdf?1390837024=response-content-disposi-tion=inline%3B+filename%3DAdoption_of_ICTs_in_a_Marginalised_Area.pdfExpires=1714988863Signature=N683m3iYa8BDSsrNBb-fZpYmsy~pftZZQbiEdNz8ZFJaL2I-Wt32FIJcLEKFnrSjj0AfnYak4RVZjuZhuFVHQZOnkt7tIBBwccqexeEkwq94rCX6r1~aA~GdyL4Z3WzHRK~Xoug17mnu869TGq8VxuSNBf-LmbSr03uZeXlk2dpobbp3ROl06wauhLm02p1th1qBM5n-Bc0q8wYS-zkY-jA9fc7w6ZE~m6hlHE6Amt1xg~db99oRcu1EuXSdHyWDZDw3OsQ9zlMfX7AU6EBhfAtFbxXuVXOlNOEPuXHgiQ1UbFveqfVKGFRg0dmYXzw62MQM0EQQ2g4qXgk2Xc2z0cQ__Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
- Description: This paper examines how a community in Dwesa, a marginalised area in the Transkei Region of the Eastern Cape, South Africa, adopts Information and Communication Technologies (ICTs). This research is part of the Siyakhula project, which aims at promoting the potential of the area through ICTs. The project is situated in four different schools: Mpume, Nondobo, Mtokwane and Ngwane. Fostering ICT awareness and a sense of owner-ship by the community are seen as crucial factors, and computer literacy education is an integral part of the project. The study focuses on how di-verse groups of people adopt new technologies and approach ICT educa-tion. Qualitative research methods such as Participatory Action Research (PAR) and Participant Observation (PO) were adopted in the study.
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Adsorption of 4-nitrophenol onto Amberlite® IRA-900 modified with metallophthalocyanines
- Authors: Marais, Eloïse , Nyokong, Tebello
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/268576 , vital:54211 , xlink:href="https://doi.org/10.1016/j.jhazmat.2007.06.096"
- Description: The adsorption of 4-nitrophenol using commercially available Amberlite® IRA-900 modified with metal phthalocyanines (MPc) was investigated. The metallophthalocyanines immobilised onto the surface of Amberlite® IRA-900 include Fe (FePcS4), Co (CoPcS4) and Ni (NiPcS4) tetrasulphophthalocyanines, and differently sulphonated phthalocyanine mixtures of Fe (FePcSmix), Co (CoPcSmix) and Ni (NiPcSmix). Adsorption rates were fastest for the modified adsorbents at a loading of 1 × 10−3 g MPc/g Amberlite, at pH 9. The highest amount of 4-NP removal was obtained on FePcSmix modified Amberlite® IRA-900 with Qt = 42.9 mmol g−1 and adsorption efficiency of 86%. The recovery efficiency of 4-NP within 150 min was 76%. Using the Langmuir–Hinshelwood kinetic model, the complexes showed an order of 4-nitrophenol adsorption to be as follows: CoPcSmix > NiPcS4 > NiPcSmix > FePcS4 > FePcSmix > CoPcS4. The MPc modified Amberlite® IRA-900 was used repeatedly, following removal of 4-NP by nitric acid, without any significant loss of activity.
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Agathis bishopi (Nixon) (Hymenoptera: braconidae) its biology and usefulness as a biological control agent for false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: tortricidae), on citrus bishopi (Nixon) (Hymenoptera: braconidae) its biology and usefulness as a biological control agent for false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: tortricidae), on citrus
- Authors: Gendall, Kierryn Leigh
- Date: 2008
- Subjects: Cryptophlebia leucotreta -- Parasites , Cryptophlebia leucotreta -- Control , Pests -- Biological control , Tortricidae , Braconidae , Citrus -- Diseases and pests
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5635 , http://hdl.handle.net/10962/d1005317 , Cryptophlebia leucotreta -- Parasites , Cryptophlebia leucotreta -- Control , Pests -- Biological control , Tortricidae , Braconidae , Citrus -- Diseases and pests
- Description: The false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), is one of the major pests of citrus in South Africa, the others being mealybug, Mediterranean fruit fly, bollworm and some mites. Due to problems such as the expense of pesticides, insects evolving pesticide resistance (Hogsette 1999), chemical residue on the skin of export fruit and the negative impact of pesticides on the environment, it became necessary to find alternative methods for pest control (Viggiani 2000). Agathis bishopi (Nixon) (Hymenoptera: Braconidae), a larval parasitoid of false codling moth known only from the Sundays River Valley area (Sishuba 2003), offers a means of control for the pest. A total of 11 389 navel oranges were collected from various orchards in the Addo/Kirkwood area, and false codling moth larvae infested 36.09% of the fruit. A single parasitoid species, A. bishopi, was reared from these larvae. In 2006 the highest parasitism rate, 11.43%, was recorded in May and in 2007, the highest parasitism rate, 13.27%, was in April. Agathis bishopi parasitizes larvae in instars 2 and 3, possibly due to the accessibility of these younger instars to the female parasitoid and possibly due to the length of the life cycle of this koinobiont. Second instar hosts yielded the highest number of parasitoids, and there was no emergence of parasitoids from fifth instar larvae. Females of A. bishopi live for 18.5 days (n = 20; S.E. = 3.1) and males for 8.25 days (n = 20; S.E. = 1.23). Females produce an average of 23 offspring in a lifetime, while female false codling moths produce about 800 eggs each. A high number of parasitoids will be required per hectare to reduce the population of false codling moth. Captive rearing of A. bishopi proved difficult due to viral and fungal contamination. Agathis bishopi has potential for use in an integrated pest management programme once the hurdle of mass-rearing has been overcome.
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An adaptive approach for optimized opportunistic routing over Delay Tolerant Mobile Ad hoc Networks
- Authors: Zhao, Xiaogeng
- Date: 2008
- Subjects: Ad hoc networks (Computer networks) Computer network architectures Computer networks Routing protocols (Computer network protocols)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4588 , http://hdl.handle.net/10962/d1004822
- Description: This thesis presents a framework for investigating opportunistic routing in Delay Tolerant Mobile Ad hoc Networks (DTMANETs), and introduces the concept of an Opportunistic Confidence Index (OCI). The OCI enables multiple opportunistic routing protocols to be applied as an adaptive group to improve DTMANET routing reliability, performance, and efficiency. The DTMANET is a recently acknowledged networkarchitecture, which is designed to address the challenging and marginal environments created by adaptive, mobile, and unreliable network node presence. Because of its ad hoc and autonomic nature, routing in a DTMANET is a very challenging problem. The design of routing protocols in such environments, which ensure a high percentage delivery rate (reliability), achieve a reasonable delivery time (performance), and at the same time maintain an acceptable communication overhead (efficiency), is of fundamental consequence to the usefulness of DTMANETs. In recent years, a number of investigations into DTMANET routing have been conducted, resulting in the emergence of a class of routing known as opportunistic routing protocols. Current research into opportunistic routing has exposed opportunities for positive impacts on DTMANET routing. To date, most investigations have concentrated upon one or other of the quality metrics of reliability, performance, or efficiency, while some approaches have pursued a balance of these metrics through assumptions of a high level of global knowledge and/or uniform mobile device behaviours. No prior research that we are aware of has studied the connection between multiple opportunistic elements and their influences upon one another, and none has demonstrated the possibility of modelling and using multiple different opportunistic elements as an adaptive group to aid the routing process in a DTMANET. This thesis investigates OCI opportunities and their viability through the design of an extensible simulation environment, which makes use of methods and techniques such as abstract modelling, opportunistic element simplification and isolation, random attribute generation and assignment, localized knowledge sharing, automated scenario generation, intelligent weight assignment and/or opportunistic element permutation. These methods and techniques are incorporated at both data acquisition and analysis phases. Our results show a significant improvement in all three metric categories. In one of the most applicable scenarios tested, OCI yielded a 31.05% message delivery increase (reliability improvement), 22.18% message delivery time reduction (performance improvement), and 73.64% routing depth decrement (efficiency improvement). We are able to conclude that the OCI approach is feasible across a range of scenarios, and that the use of multiple opportunistic elements to aid decision-making processes in DTMANET environments has value.
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An analysis of exchange rate pass-through to prices in South Africa
- Authors: Karoro, Tapiwa Daniel
- Date: 2008
- Subjects: Foreign exchange rates -- South Africa , Monetary policy -- South Africa , Inflation (Finance) -- South Africa , Prices -- South Africa , Banks and banking -- South Africa , South Africa -- Economic policy
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:953 , http://hdl.handle.net/10962/d1002687 , Foreign exchange rates -- South Africa , Monetary policy -- South Africa , Inflation (Finance) -- South Africa , Prices -- South Africa , Banks and banking -- South Africa , South Africa -- Economic policy
- Description: The fact that South Africa has a floating exchange rate policy as well as an open trade policy leaves the country’s import, producer and consumer prices susceptible to the effects of exchange rate movements. Given the central role that inflation targeting occupies in South Africa’s monetary policy, it becomes necessary to determine the nature of influence of exchange rate changes on domestic prices. To this end, this thesis examines the magnitude and speed of exchange rate pass-through (ERPT) to import, producer and consumer prices in South Africa. Furthermore, it explores whether the direction and size of changes in the exchange rate have different pass-through effects on import prices, that is, whether the exchange rate pass-through is symmetric or asymmetric. The paper uses monthly data covering the period January 1980 to December 2005. In investigating ERPT, two main stages are identified. The initial stage is the transmission of fluctuations in the exchange rate to import prices, while the second-stage entails the pass-through of changes in import prices to producer and consumer prices. The first stage is estimated using the Johansen (1991) and (1995) cointegration techniques and a vector error correction model (VECM). The second stage pass-through is determined by estimating impulse response and variance decomposition functions, as well as conducting block exogeneity Wald tests. The study follows Wickremasinghe and Silvapulle’s (2004) approach in estimating pass-through asymmetry with respect to appreciations and depreciations. In addition, the thesis adapts the analytical framework of Wickremasinghe and Silvapulle (2004) to investigate the pass-through of large and small changes in the exchange rate to import prices. The results suggest that ERPT in South Africa is incomplete but relatively high. Furthermore, ERPT is found to be higher in periods of rand depreciation than appreciation which supports the binding quantity constraint theory. There is also some evidence that pass-through is higher in periods of small changes than large changes in the exchange rate, which supports the menu cost theory when invoices are denominated in the exporters’ currency.
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An analysis of local level development in South Africa: a case study of Uitenhage
- Authors: Meyer, Sarah
- Date: 2008
- Subjects: Local government -- South Africa -- Uitenhage -- Case studies Economic development -- South Africa -- Case studies Municipal corporations -- South Africa -- Case studies Community development -- South Africa -- Case studies Cities and towns -- South Africa -- Case studies Social responsibility of business -- South Africa Small business -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:4813 , http://hdl.handle.net/10962/d1005487
- Description: Development backlogs, in terms of unemployment and poverty, plague many developing countries. Countries have established and implemented various policies and plans to address these challenges. In response to these development backlogs, South Africa has instituted the notion of decentralisation and developmental local government, whereby local governments are largely responsible for initiating and facilitating development in the area under their jurisdiction. Furthermore, the potential role the private sector can play in development is being increasingly recognised by government, politicians, academics and developers alike. Uitenhage has a strong corporate presence and therefore this sector has the potential to contribute towards development in the town. However the concept of using corporate social responsibility (CSR) to promote development in South Africa is relatively new and, as will be revealed in the case study, definitions and underlying motivation for undertaking CSR vary. Local Economic Development (LED) and, more recently, CSR, have been recognised as major drivers of development and are being implemented throughout the country. As this thesis illustrates, they often merge and can work hand-in-hand to promote local development. Although the private sector, through CSR has the potential to contribute to development, they often do not have the available human resources to implement development initiatives. As is evident in the case study, partnerships between the private and public sectors often emerge as a result. Development institutions play a key role in development and often assist in bridging the gap between citizens, the state and the market. The development institutions in Uitenhage often act as instigators and facilitators on behalf of the larger corporations. The case study in Uitenhage, is a locality where there is a strong automotive industrial cluster and several major firms which are active in the development process. Furthermore, development institutions are committed to the socio-economic development of the town and the promotion of small micro medium enterprises (SMMEs), through various support services. The development institutions, often in partnership with the local government and the public sector, have initiated various local developmental projects in the town, of which three will be discussed in the case study. In this thesis, case study research reveals that corporations often do not meet their potential developmental role and their CSR actions are often considered as ‘window-dressing’ aimed at boosting their corporate image. Similarly, with regard to the development institutions, their development and job creation results look impressive at first glance, but further investigation reveals a collapse of a large number of projects. Despite the potential of LED and CSR to be major drivers of local development, there are still a number of hindering factors, which will be revealed in this thesis and lessons to be learnt which can help to inform future local development projects
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An Analysis of Network Scanning Traffic as it relates to Scan-Detection in Network Intrusion Detection Systems
- Authors: Barnett, Richard J , Irwin, Barry V W
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428156 , vital:72490 , https://www.researchgate.net/profile/Barry-Ir-win/publication/326225058_An_Analysis_of_Network_Scanning_Traffic_as_it_relates_to_Scan-Detec-tion_in_Network_Intrusion_Detection_Systems/links/5b3f21eaa6fdcc8506ffe659/An-Analysis-of-Network-Scanning-Traffic-as-it-relates-to-Scan-Detection-in-Network-Intrusion-Detection-Systems.pdf
- Description: Network Intrusion Detection is, in a modern network, a useful tool to de-tect a wide variety of malicious traffic. The ever present prevalence of scanning activity on the Internet is fair justification to warrant scan de-tection as a component of network intrusion detection. Whilst current systems are able to perform scan-detection, the methods they use are often flawed and exhibit an inability to detect scans in an efficient and scalable manner. Existing research by van Riel and Irwin has illustrated a number of flaws present in the open source systems Snort and Bro. This paper builds on this by describing current research at Rhodes Uni-versity in which these flaws are being addressed. In particular, this re-search will address the flaws in the scan-detection engines in Snort and Bro by developing new plug-ins for these systems which take into con-sideration the improvements which are identified over the course of the research.
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An analysis of the implementation of sustainability principles in Buffalo City Municipality
- Authors: Mniki, Phumzile
- Date: 2008
- Subjects: Buffalo City (South Africa) Local government -- South Africa -- Eastern Cape -- Case studies Municipal government -- South Africa -- Eastern Cape -- Case studies Sustainable development -- South Africa -- Eastern Cape -- Case studies Strategic planning -- South Africa -- Eastern Cape -- Case studies Economic development -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:790 , http://hdl.handle.net/10962/d1003941
- Description: This study investigated the planning, implementation and monitoring of sustainability principles in Buffalo City Municipality (BCM), in the Eastern Cape Province. It also analysed how reporting on sustainability principles was done at this municipality. The research was conducted as a qualitative case study that used analyses of documents, questionnaires and interviews to gather data. All respondents were involved with BCM, some as municipal officials in key positions in the different directorates and others as councillors. The study was contextualised within the area of sustainable development at local government level. The focus was on how the mandate of sustainable local development at local government level was met in BCM. The focus was on the planning, implementation and monitoring of stipulations of Local Agenda 21 and sustainability principles. The study focused on the provision of basic services; inter-generational equity; integration of economic, social and environmental aspects; community involvement; institutional capacity building; partnerships, and global links. The study established that Buffalo City Municipality incorporated sustainability in its vision. There was a lack of common understanding of the meaning of sustainability. Sustainability principles featured prominently at the integrated development planning phase but were less explicitly mentioned in the implementation, monitoring and reporting phases. Sustainability principles were subsumed in the developmental goals of the municipality. The study also highlighted the need for a strategy to have an institution-wide implementation of sustainability principles which would incorporate raising awareness about sustainability and its value.
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An analysis of the influence of question design on pupils' approaches to number pattern generalisation tasks
- Authors: Samson, Duncan Alistair
- Date: 2008
- Subjects: Mathematics -- Study and teaching Number theory -- Problems, exercises, etc Algebra -- Study and teaching Arithmetic -- Foundations Pattern perception
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1421 , http://hdl.handle.net/10962/d1003302
- Description: This study is based on a qualitative investigation framed within an interpretive paradigm, and aims to investigate the extent to which question design affects the solution strategies adopted by children when solving linear number pattern generalisation tasks presented in pictorial and numeric contexts. The research tool comprised a series of 22 pencil and paper exercises based on linear generalisation tasks set in both numeric and 2-dimensional pictorial contexts. The responses to these linear generalisation questions were classified by means of stage descriptors as well as stage modifiers. The method or strategy adopted was carefully analysed and classified into one of seven categories. A meta-analysis focused on the formula derived for the nth term in conjunction with its justification. The process of justification proved to be a critical factor in being able to accurately interpret the origin of the sub-structure evident in many of these responses. From a theoretical perspective, the central role of justification/proof within the context of this study is seen as communication of mathematical understanding, and the process of justification/proof proved to be highly successful in providing a window of understanding into each pupil’s cognitive reasoning. The results of this study strongly support the notion that question design can play a critical role in influencing pupils’ choice of strategy and level of attainment when solving pattern generalisation tasks. Furthermore, this study identified a diverse range of visually motivated strategies and mechanisms of visualisation. An awareness and appreciation for such a diversity of visualisation strategies, as well as an understanding of the importance of appropriate question design, has direct pedagogical application within the context of the mathematics classroom.
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An appraisal of basic infrastructural service delivery and community participation at the local level a case study of three municipalities in the Eastern Cape
- Authors: Mamba, Bonginkosi
- Date: 2008
- Subjects: Municipal services -- South Africa -- Eastern Cape Case studies , Housing policy -- South Africa -- Eastern Cape Case studies , Housing -- South Africa -- Eastern Cape Case studies , Local government -- South Africa -- Eastern Cape Case studies
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:958 , http://hdl.handle.net/10962/d1002692 , Municipal services -- South Africa -- Eastern Cape Case studies , Housing policy -- South Africa -- Eastern Cape Case studies , Housing -- South Africa -- Eastern Cape Case studies , Local government -- South Africa -- Eastern Cape Case studies
- Description: Housing provision plays a vital role in meeting basic needs. Dwellings provide the security required for basic functioning and are thus essential for both human development and the alleviation of poverty. This study examines the levels and quality of basic infrastructural service delivery (electricity, water and sanitation) at local government level, focusing on housing. The local government areas studied include Grahamstown Fort Beaufort and Duncan Village. This was done for the purposes of analyzing the effectiveness of the existing housing policy with regard to the adequacy of scale, its developmental logic, implementation and coordination. Justification for basic infrastructural service delivery is based on the Basic Needs Approach [BNA] which forms the cornerstone of the World Bank’s delivery framework. The paper makes use of two methods: firstly, secondary sources are used to provide an impression of the broad policy framework focusing around basic service delivery with housing as the centrepiece. Specific attention is thus given to Integrated Development Plans (IDPs) as this is the level of policy-making responsible for the delivery of these services to communities. Secondly, previously un-analysed data drawn from a household social exclusion survey (2005-2006) conducted in three Eastern Cape municipalities (Buffalo City, Makana and Nkonkobe – representing respectively urban, small town, and rural areas) are evaluated. The data are analysed two ways – graphically and through a regression analysis – to test four hypotheses regarding basic service delivery. Graphical analysis demonstrates that services differ according to housing type and location. It was found that brick houses seem more likely to have better basic services than either shacks or mud dwellings. The results also show that there are inequalities in the provision of certain basic services such as water and sanitation between Duncan Village and Grahamstown. Overall, the results of this study show that government is still faced with major challenges in addressing housing backlogs.
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An assessment of the companion modelling approach in a context of negotiating water allocation strategies : the case of the Kat River Valley, Eastern Cape, South Africa
- Authors: Gumede, Felicity Hlengiwe
- Date: 2008
- Subjects: Water supply -- South Africa -- Kat River Valley -- Management , Water resources development -- South Africa -- Kat River Valley , Integrated water development -- South Africa -- Kat River Valley
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4820 , http://hdl.handle.net/10962/d1005494 , Water supply -- South Africa -- Kat River Valley -- Management , Water resources development -- South Africa -- Kat River Valley , Integrated water development -- South Africa -- Kat River Valley
- Description: This Masters research took place in the Kat River Valley in the Eastern Cape, South Africa. The Kat River Valley is a semi-rural catchment that covers an area of approximately 1700km² and is characterized by a complicated history of dispossession and resettlement. Farming is the main activity that is practiced in the area. This includes the farming of citrus at a commercial scale, rangeland stock farming and small-scale vegetable farming. The economy of the catchment is enhanced mostly by commercial citrus farming, which consumes by far the largest amount of water in the river through irrigation. Water allocation is a burning issue among water users in the catchment and needs to be negotiated taking into consideration social, economic and environment impacts. The aim of this study is to describe, discuss and evaluate the Companion Modelling (ComMod) approach, which used a simulation model and a role-playing game related to the model in order to facilitate and develop negotiating skills as well as build capacity in decision-making amongst local stakeholders for water resource management in the Kat River Valley. The ComMod approach, developed by a group of Companion Modellers, is a community-based science approach that emerged in the 1990s. The ComMod approach is used in order to facilitate collective learning, negotiation and institutional innovation in dealing with resource management complexities faced by rural communities. Through ComMod, the model (KatAWARE) and its related role-playing game was developed by having the contact with local stakeholders. The information to feed the model and the role-playing game came from informal interviews, surveys, geographic information systems (GIS), workshops and focus groups. The use of workshops in the implementation of ComMod was a success. Results show that (1) new knowledge was acquired, which allowed stakeholders to have a broad understanding of a catchment system. (2) Awareness was created about complex systems and enabled stakeholders to see an individual action into to the broader system. (3) Strong interrelationships were fostered amongst different water users, which allowed stakeholders to share their view points. The ComMod process was however associated with a number of limitations, many of which resulted from the constraints that were imposed by the socio-economic background of the study area. Nevertheless, the outcome of the study shows that the ComMod process was useful in helping the Kat River Water Users Association (KRWUA) stakeholders develop negotiating skills regarding water allocation strategies for the development of the Catchment Management Plan.
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An assessment of the service quality expectations and perceptions of the patients of Awali Hospital in the Kingdom of Bahrain
- Authors: Luke, Gary Joseph
- Date: 2008
- Subjects: Awali Hospital Hospitals, Proprietary -- Bahrain Hospital care -- Quality control -- Bahrain Hospital care -- Evaluation -- Bahrain Customer services -- Rating of -- Bahrain Quality assurance
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:730 , http://hdl.handle.net/10962/d1003850
- Description: The quality of service from a hospital is the number one factor that will either turn a customer/patient away or make one for life. More and more hospitals are competing for greater shares in the market and customer-driven quality management is becoming the preferred method for improving their performance. Awali hospital is a private hospital in the Kingdom of Bahrain. It is a small 35-bed hospital that offers private medical services to the public. The hospital was originally built to serve the Bahrain Petroleum Company (Bapco) refinery workers but later opened its doors to the public. With the introduction of private patients came higher expectations of quality and higher demands on the overall services. A number of service quality shortfalls were identified over the years but never identified quantitatively by a patient evaluation survey. An English and Arabic version of the questionnaire based on SERVQUAL (Zeithaml, Parasuraman and Berry, 1988) was developed and placed in Awali hospital to test these service quality shortfalls. This study intends to evaluate these areas by answering questions about the relevant areas of service provided by the hospital. It measured patient satisfaction by looking at human aspects of service (responsiveness, reliability, empathy and assurance) with only one factor of the instrument being devoted to the non-human aspect of care rendered (tangibles). The SERVQUAL instrument has five dimensions that were measured by 21 pairs of item statements. One statement from each pair reflects perceptions, the other expectations. Measurement was accomplished by subtracting expectation from perceptions resulting in a service quality score. Positive or zero scores would reflect ideal or adequate service quality offered by the hospital. A negative score would be indicative of a service experience that did not meet customer expectations. Using the SERVQUAL questionnaire provided, quantifiable reasoning to the research questions in each dimension could be obtained so that precision, objectivity and rigour replaced hunches, experience and intuition as a means of investigating problem areas. Customers were first asked to supply some additional demographic information, for example gender, number of hospital visits, nationality, patient type (Bapco worker, general practitioner referred or private) and type of visit (inpatient, outpatient or both). They werethen asked to rate the hospital service on a 7-point Likert scale ranging from Strongly Agree (7) to Strongly Disagree (1). At the end of the questionnaire was space to write open comments. In total 600 paper questionnaires were distributed in the hospital, 300 English and 300 Arabic. Another 150 electronic questionnaires via emails were sent to refinery workers. Of the total 750 questionnaires distributed 162 were returned of which 156 (or 21.6%) could be statistically analysed. The empirical data results showed that the perception scores were significantly different at the p < 0.05 level from expectation scores. All the service quality differences (SQ=P-E) were negatively scored. This indicated that patients were not satisfied in all five dimensions of services offered by the hospital. Of the five dimensions responsiveness had the largest difference with assurance and reliability following with no significant differences between them. The demographic information revealed some interesting differences between the groups. Of all the demographic groups the most significant differences were between groups, “patient types” and “types of visit”, which showed differences between private patients and refinery workers and patients who used the hospital only as an outpatient and patients who used both services, outpatient and inpatient. In terms of the managerial implications, it was recommended that Awali hospital look to closing Gaps 1-4 of the SERVQUAL gap model which would result in closing the consumer gap, Gap 5. A process model for continuous measurement and improvement of service quality was recommended that looks at asking questions about how the hospital is performing. By adopting some of the recommendations identified in the research questions, Awali hospital could improve their quality of service, and as a consequence, their customer satisfaction and loyalty.
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An empirical analysis of the long-run comovement, dynamic returns linkages and volatility transmission between the world major and the South African stock markets
- Authors: Chinzara, Zivanemoyo
- Date: 2008
- Subjects: Stock exchanges -- South Africa , Globalization -- Economic aspects -- South Africa , International economic relations , Portfolio management -- South Africa , Monetary policy -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:970 , http://hdl.handle.net/10962/d1002704 , Stock exchanges -- South Africa , Globalization -- Economic aspects -- South Africa , International economic relations , Portfolio management -- South Africa , Monetary policy -- South Africa
- Description: The international linkages of stock markets have important implications for cost of capital and portfolio diversification. Recent trends in globalization, financial liberalization and financial innovation raises questions with regard to whether African stock markets are being integrated into world equity markets. This study examines the extent to which the South African (SA) equity market is integrated into the world equity markets using daily data for the period 1995-2007. The study is divided into three main parts, each looking at the different ways in which integration can be considered. The first investigates whether there is long run comovement between the SA and the major global equity markets. Both bivariate and multivariate Johansen (1988) and Johansen and Juselius (1990) cointegration approaches were utilised. Vector Error Correction Models (VECMs) are then estimated for portfolios which show evidence of cointegration. The second part analyses returns linkages using the Vector Autoregressive (VAR), block exogeneity, impulse response and variance decomposition. The third part examines the behaviour of volatility and volatility linkages among the stock markets. Firstly volatility is analysed using the GARCH, EGARCH and GJR GARCH. Simultaneously, the hypothesis that investors receive a premium for investing in more risky stock markets is explored using the GARCH-in mean. The long term trend of volatility is also examined. Volatility linkages are then analysed using the VAR, block exogeneity, impulse response and variance decomposition. The first part established that no bivariate cointegration exists between the SA and any of the stock markets being studied, implying that pairwise portfolio diversification is potentially worthwhile for SA portfolio managers. However, multivariate cointegration exists for some portfolios, with the US, UK, Germany and SA showing evidence of error correction for some of these portfolios. Findings on return linkages is that there are significant returns linkages among the markets, with the US and SA being the most exogenous and most endogenous respectively. Findings regarding volatility are that the volatility in all the markets is inherently asymmetric and that except for the US there is no risk premium in any of the markets. The long term trend of volatility in all the stock markets was found to be relatively stable. The final finding was that significant volatility linkages exist among the markets, with the US being the most exogenous and SA and China showing evidence of bidirectional linkages. Overall, except for volatility linkages, the integration of SA into the global equity markets is still quite low. Thus, both SA and international investors can capitalise on this portfolio diversification potential. On the other hand, policy makers should capitalise on this and make policies that will attract the much needed foreign investors.
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An Evaluation Of Scan-Detection Algorithms In Network Intrusion Detection Systems
- Authors: Barnett, Richard J , Irwin, Barry V W
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428701 , vital:72530 , https://digifors.cs.up.ac.za/issa/2008/Proceedings/Research/29.pdf
- Description: Network Intrusion Detection Systems are becoming more prevalent as devices to protect a network. However, the methods they use for some forms of detection are flawed. This paper builds upon existing research by van Riel and Irwin which illustrated these flaws in Snort and Bro's scan-detection engines. Indeed, it has been ascertained that a number of different scanning techniques are not identified by either Snort or Bro. This paper highlights current research into the improvement of these scan detection algorithms and presents insight into how this re-search is being conducted at Rhodes University. This research will im-prove on the scan detection engines in Snort and Bro, permitting them to be used in a production environment without fear of succumbing to the false negative problem which currently exists.
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