DRAPA-a flexible framework for evaluating the quality of VoIP components
- Clayton, Bradley, Terzoli, Alfredo, Irwin, Barry V W
- Authors: Clayton, Bradley , Terzoli, Alfredo , Irwin, Barry V W
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428213 , vital:72494 , https://d1wqtxts1xzle7.cloudfront.net/3456214/No_268_-_Clayton-libre.pdf?1390832682=andresponse-content-disposi-tion=inline%3B+filename%3DDRAPA_a_flexible_framework_for_evaluatin.pdfandExpires=1714742712andSignature=FTQ3UMH7w9KMXeuld-NbnboBP9kqza7jDnVI2AJMFrhV6fkW56bPgPZKVAY-bKJFqJP-jq4h4JwRhWVuCA-oIIA4ckbhKHA4OoL4X5DYtlujkhkombcp-B5fVR02AioXBazDtfnTGvZLE21wluH0BnkBL9OAQSen7YJDzDsYtNH2pFIn06Nmg9-kDaJoRmW9KWlQs8BwyaXml4-pG~FrpiGCRclANXBSpmsxYSdJyZAnHq2ZZNqx9pEHigaYHUUgllDq64dp8C8R84xAbbbRcvt-XNhuQ~fU2AkJILms4FUkJSjGI0E-TOKhh7vQiVIh5KzZX8MOiS~rEuBH6ekx8g__andKey-Pair-Id=APKAJLOHF5GGSLRBV4ZA
- Description: When adding to or altering a VoIP system, the overall performance and quality of the system is at risk. For example, adding confidentiality, in-tegrity and authentication (CIA) would incur an overhead for each addi-tional security method. A method of measuring the performance of a VoIP system after a change or addition is needed. This paper describes a framework and testbed (DRAPA) which provides a flexible base from which VoIP performance analysis systems can be built. DRAPA gener-ates and collects data from any part of a VoIP system within a real do-main. This paper also discusses the flexibility of DRAPA. While security is our primary focus, DRAPA allows the user to configure the testbed and change the type and nature of data to be collected.
- Full Text:
- Date Issued: 2006
- Authors: Clayton, Bradley , Terzoli, Alfredo , Irwin, Barry V W
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428213 , vital:72494 , https://d1wqtxts1xzle7.cloudfront.net/3456214/No_268_-_Clayton-libre.pdf?1390832682=andresponse-content-disposi-tion=inline%3B+filename%3DDRAPA_a_flexible_framework_for_evaluatin.pdfandExpires=1714742712andSignature=FTQ3UMH7w9KMXeuld-NbnboBP9kqza7jDnVI2AJMFrhV6fkW56bPgPZKVAY-bKJFqJP-jq4h4JwRhWVuCA-oIIA4ckbhKHA4OoL4X5DYtlujkhkombcp-B5fVR02AioXBazDtfnTGvZLE21wluH0BnkBL9OAQSen7YJDzDsYtNH2pFIn06Nmg9-kDaJoRmW9KWlQs8BwyaXml4-pG~FrpiGCRclANXBSpmsxYSdJyZAnHq2ZZNqx9pEHigaYHUUgllDq64dp8C8R84xAbbbRcvt-XNhuQ~fU2AkJILms4FUkJSjGI0E-TOKhh7vQiVIh5KzZX8MOiS~rEuBH6ekx8g__andKey-Pair-Id=APKAJLOHF5GGSLRBV4ZA
- Description: When adding to or altering a VoIP system, the overall performance and quality of the system is at risk. For example, adding confidentiality, in-tegrity and authentication (CIA) would incur an overhead for each addi-tional security method. A method of measuring the performance of a VoIP system after a change or addition is needed. This paper describes a framework and testbed (DRAPA) which provides a flexible base from which VoIP performance analysis systems can be built. DRAPA gener-ates and collects data from any part of a VoIP system within a real do-main. This paper also discusses the flexibility of DRAPA. While security is our primary focus, DRAPA allows the user to configure the testbed and change the type and nature of data to be collected.
- Full Text:
- Date Issued: 2006
Izaci namaqhalo esiXhosa: Xhosa idioms and proverbs referring to plants
- Cocks, Michelle L, Dold, Anthony P
- Authors: Cocks, Michelle L , Dold, Anthony P
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141326 , vital:37962 , https://hdl.handle.net/10520/EJC112940
- Description: Converging with the ecological extinction crisis, the planet has been experiencing a severe erosion of the diversity of human cultures and languages, reducing the pool of knowledge, behaviors and values from which individual communities and humanity at large can draw to respond to social and environmental stresses.
- Full Text:
- Date Issued: 2006
- Authors: Cocks, Michelle L , Dold, Anthony P
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141326 , vital:37962 , https://hdl.handle.net/10520/EJC112940
- Description: Converging with the ecological extinction crisis, the planet has been experiencing a severe erosion of the diversity of human cultures and languages, reducing the pool of knowledge, behaviors and values from which individual communities and humanity at large can draw to respond to social and environmental stresses.
- Full Text:
- Date Issued: 2006
What matters in economics teaching and learning? A case study of an introductory macroeconomics course in South Africa
- Snowball, Jeanette D, Wilson, M K
- Authors: Snowball, Jeanette D , Wilson, M K
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68500 , vital:29270 , https://doi.org/10.19030/tlc.v3i11.1659
- Description: Publisher version , In many universities, economics lecturers now face the challenge of dealing with large, diverse classes, especially at undergraduate level. A common concern is the non-attendance at lectures of unmotivated (conscript) students. Poor lecture quality, as reflected in student evaluations of teaching (SETs), is often blamed for lack of attendance and consequent poor performance. This paper presents the results of a student assessment of a macroeconomics 1 course, coupled with a self-assessment of their own input into the course. The results obtained, using econometric models, suggest that students inputs and attitudes to the course are equally, or more, important than lecture attendance itself.
- Full Text:
- Date Issued: 2006
- Authors: Snowball, Jeanette D , Wilson, M K
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68500 , vital:29270 , https://doi.org/10.19030/tlc.v3i11.1659
- Description: Publisher version , In many universities, economics lecturers now face the challenge of dealing with large, diverse classes, especially at undergraduate level. A common concern is the non-attendance at lectures of unmotivated (conscript) students. Poor lecture quality, as reflected in student evaluations of teaching (SETs), is often blamed for lack of attendance and consequent poor performance. This paper presents the results of a student assessment of a macroeconomics 1 course, coupled with a self-assessment of their own input into the course. The results obtained, using econometric models, suggest that students inputs and attitudes to the course are equally, or more, important than lecture attendance itself.
- Full Text:
- Date Issued: 2006
Imbhola yesiXhosa traditional Xhosa cosmetics:
- Cocks, Michelle L, Dold, Anthony P
- Authors: Cocks, Michelle L , Dold, Anthony P
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141370 , vital:37966 , http://pza.sanbi.org/sites/default/files/info_library/imbhola_yesixhosa_pdf.pdf
- Description: Plants have been used for cosmetic purposes since time immemorial. The earliest known cosmetics come from the First Dynasty of Egypt, about 3100-2907 BC. Since the ancient Egyptians who used olive oil perfumed with aromatic plants to keep their skin supple, humans have been using plant extracts for cleansing and beautifying purposes.
- Full Text:
- Date Issued: 2005
- Authors: Cocks, Michelle L , Dold, Anthony P
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141370 , vital:37966 , http://pza.sanbi.org/sites/default/files/info_library/imbhola_yesixhosa_pdf.pdf
- Description: Plants have been used for cosmetic purposes since time immemorial. The earliest known cosmetics come from the First Dynasty of Egypt, about 3100-2907 BC. Since the ancient Egyptians who used olive oil perfumed with aromatic plants to keep their skin supple, humans have been using plant extracts for cleansing and beautifying purposes.
- Full Text:
- Date Issued: 2005
Marine Reserves: a guide to science, design, and use
- Authors: Booth, Anthony J
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124965 , vital:35714 , https://doi.10.2989/16085910509503862
- Description: With the considerable pressures that are being placed on our marine resources, there is an urgent need to find alternative strategies to ensure their long-term sustainability. One measure that has been proposed, and which is rapidly gaining popularity, is the designation of Marine Protected Area (MPA). These are demarcated areas that prohibit (or at least restrict) consumptive or extractive uses, such that human interferences and impacts are minimised. In this edited collection of papers, most of which have been written or co-written by the authors themselves, Sobel and Dahlgren have presented an excellent synopsis of the rationale behind, and the scientific basis underpinning, the use of marine reserves as a management tool. In addition, they have devoted half the book to the provision of case studies.
- Full Text:
- Date Issued: 2005
- Authors: Booth, Anthony J
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124965 , vital:35714 , https://doi.10.2989/16085910509503862
- Description: With the considerable pressures that are being placed on our marine resources, there is an urgent need to find alternative strategies to ensure their long-term sustainability. One measure that has been proposed, and which is rapidly gaining popularity, is the designation of Marine Protected Area (MPA). These are demarcated areas that prohibit (or at least restrict) consumptive or extractive uses, such that human interferences and impacts are minimised. In this edited collection of papers, most of which have been written or co-written by the authors themselves, Sobel and Dahlgren have presented an excellent synopsis of the rationale behind, and the scientific basis underpinning, the use of marine reserves as a management tool. In addition, they have devoted half the book to the provision of case studies.
- Full Text:
- Date Issued: 2005
The Dassie and the Hunter: A South African Meeting
- Authors: Kaschula, Russell H
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/175147 , vital:42547 , https://doi.org/10.4314/tvl.v43i1.29727
- Description: This book does not resemble any of Jeff Opland’s previous academic works. There is no similarity in style, and to some extent content. His previous books, namely, Xhosa oral poetry: Aspects of a black South African tradition (Cambridge University Press, 1983), and Xhosa poets and poetry (David Philip, 1998), were written as purely scientific, academic works. The Dassie and the Hunter amounts to a subtle snub of academia and its restrictive rules. Though written by Opland, it is as if he and his research subject, Manisi, have colluded to make this work different and special, in a personal mystical way, disregarding academic etiquette, weaving a more creative, poetic tapestry. This makes the book an interesting read. In style and content, it is neither rigorously academic, solely biographical, nor purely creative. It evades classification. It is individualistic.
- Full Text:
- Date Issued: 2005
- Authors: Kaschula, Russell H
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/175147 , vital:42547 , https://doi.org/10.4314/tvl.v43i1.29727
- Description: This book does not resemble any of Jeff Opland’s previous academic works. There is no similarity in style, and to some extent content. His previous books, namely, Xhosa oral poetry: Aspects of a black South African tradition (Cambridge University Press, 1983), and Xhosa poets and poetry (David Philip, 1998), were written as purely scientific, academic works. The Dassie and the Hunter amounts to a subtle snub of academia and its restrictive rules. Though written by Opland, it is as if he and his research subject, Manisi, have colluded to make this work different and special, in a personal mystical way, disregarding academic etiquette, weaving a more creative, poetic tapestry. This makes the book an interesting read. In style and content, it is neither rigorously academic, solely biographical, nor purely creative. It evades classification. It is individualistic.
- Full Text:
- Date Issued: 2005
Transmitting rdf graph deltas for a cheaper semantic web
- Cloran, Russell, Irwin, Barry V W
- Authors: Cloran, Russell , Irwin, Barry V W
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428288 , vital:72500
- Description: The Resoure Description Format is set to become the format to fulfill the vision of the Semantic Web. If RDF is widely to be used as a data representation framework, it would be advantageous to support the transmission differences in RDF graphs, enabling small and therefore possibly more frequent updates. This paper discusses the tools re-quired to enable transmission of graph differences, and the work need-ed to complete this toolset.
- Full Text:
- Date Issued: 2005
- Authors: Cloran, Russell , Irwin, Barry V W
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428288 , vital:72500
- Description: The Resoure Description Format is set to become the format to fulfill the vision of the Semantic Web. If RDF is widely to be used as a data representation framework, it would be advantageous to support the transmission differences in RDF graphs, enabling small and therefore possibly more frequent updates. This paper discusses the tools re-quired to enable transmission of graph differences, and the work need-ed to complete this toolset.
- Full Text:
- Date Issued: 2005
Shakespeare's Victorian Stage: performing history in the theatre of Charles Kean, Richard W. Schoch: book review
- Authors: Wright, Laurence
- Date: 2004
- Language: English
- Type: text , article
- Identifier: vital:7050 , http://hdl.handle.net/10962/d1007393 , http://hdl.handle.net/10520/EJC48030
- Description: preprint , This book is a primarily a study of Charles Kean’s productions of Shakespeare’s English chronicle plays at the Princess’s Theatre between 1852 and 1859, a period crucial to the development of ideas of English nationalism. Schoch focuses on these particular stagings as more than drama; as performances of nineteenth century theories of history and historical representation. His project operates under the aegis of the so-called ‘linguistic turn’ in cultural theory, and is suspicious of neo-marxian fundamentalism.
- Full Text:
- Date Issued: 2004
- Authors: Wright, Laurence
- Date: 2004
- Language: English
- Type: text , article
- Identifier: vital:7050 , http://hdl.handle.net/10962/d1007393 , http://hdl.handle.net/10520/EJC48030
- Description: preprint , This book is a primarily a study of Charles Kean’s productions of Shakespeare’s English chronicle plays at the Princess’s Theatre between 1852 and 1859, a period crucial to the development of ideas of English nationalism. Schoch focuses on these particular stagings as more than drama; as performances of nineteenth century theories of history and historical representation. His project operates under the aegis of the so-called ‘linguistic turn’ in cultural theory, and is suspicious of neo-marxian fundamentalism.
- Full Text:
- Date Issued: 2004
A digital watermarking scheme for Bezier surfaces
- Chadwick, J, Bangay, Shaun D, Wentworth, Peter E
- Authors: Chadwick, J , Bangay, Shaun D , Wentworth, Peter E
- Date: 2003
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/432769 , vital:72898 , https://www.cs.ru.ac.za/research/groups/vrsig/pastprojects/046watermarking/paper01.pdf
- Description: Owners and vendors are increasingly publishing their materials in digital form. Because such materials can be exactly copied, a mechanism is required that will protect the legitimate owners of these works, by providing proof of original ownership. Digital watermarking has now become one accepted method of establishing ownership of digital materials. The owner of a work embeds a pattern, called a digital watermark, in the content. This embedded watermark is normally undetectable, but its presence can be demonstrated by the owner of the work or his agent, thereby proving ownership. Digital watermarking has been used for many types of multimedia content, primarily audio, video and flat images. Recently, interest has been shown in applying digital watermarking schemes to 3D surfaces, in various formats. In this paper, we examine a method whereby a digital watermark can be embedded in a Bezier surface. A prototype watermarking method for such surfaces is presented, with some experimental results, and a discussion of directions for future research.
- Full Text:
- Date Issued: 2003
- Authors: Chadwick, J , Bangay, Shaun D , Wentworth, Peter E
- Date: 2003
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/432769 , vital:72898 , https://www.cs.ru.ac.za/research/groups/vrsig/pastprojects/046watermarking/paper01.pdf
- Description: Owners and vendors are increasingly publishing their materials in digital form. Because such materials can be exactly copied, a mechanism is required that will protect the legitimate owners of these works, by providing proof of original ownership. Digital watermarking has now become one accepted method of establishing ownership of digital materials. The owner of a work embeds a pattern, called a digital watermark, in the content. This embedded watermark is normally undetectable, but its presence can be demonstrated by the owner of the work or his agent, thereby proving ownership. Digital watermarking has been used for many types of multimedia content, primarily audio, video and flat images. Recently, interest has been shown in applying digital watermarking schemes to 3D surfaces, in various formats. In this paper, we examine a method whereby a digital watermark can be embedded in a Bezier surface. A prototype watermarking method for such surfaces is presented, with some experimental results, and a discussion of directions for future research.
- Full Text:
- Date Issued: 2003
A new public sphere?: outstanding issues
- Wasserman, Herman, de Beer, Arrie
- Authors: Wasserman, Herman , de Beer, Arrie
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159142 , vital:40272 , https://hdl.handle.net/10520/EJC146261
- Description: It is widely accepted that a healthy public sphere is a necessity for democracy, and that the media can facilitate debate in this sphere. In the years since democratisation in South Africa, the media's freedom to fulfil this role has been jealously guarded.
- Full Text:
- Date Issued: 2003
- Authors: Wasserman, Herman , de Beer, Arrie
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159142 , vital:40272 , https://hdl.handle.net/10520/EJC146261
- Description: It is widely accepted that a healthy public sphere is a necessity for democracy, and that the media can facilitate debate in this sphere. In the years since democratisation in South Africa, the media's freedom to fulfil this role has been jealously guarded.
- Full Text:
- Date Issued: 2003
Asterisk: A converged tdm and packet-based communications system
- Authors: Penton, J , Terzoli, Alfredo
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/427547 , vital:72446 , https://citeseerx.ist.psu.edu/document?repid=rep1andtype=pdfanddoi=70080710a6f96bf1c071be14a8b21c17ff8cbc4d
- Description: Converged TDM and packet-based communications systems are a popular topic in computer science and telecommunications arenas. This paper discusses a system called Asterisk that is an open source hybrid TDM and packet voice platform. Asterisk is designed to interface any piece of telephony hardware or software with any telephony application. This makes Asterisk a powerful component that can be easily used in NGN softswitches, conferencing servers and Private Branch eXchanges (PBX). Asterisk has been deployed in the Rhodes University Computer Science Department’s VoIP environment and integrated with our existing H. 323 and SIP packet-based networks. This paper discusses the de-ployment of Asterisk, its interworking with our H. 323 and SIP networks and the functionality it offers in terms of a converged TDM and packet-based communications system.
- Full Text:
- Date Issued: 2003
- Authors: Penton, J , Terzoli, Alfredo
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/427547 , vital:72446 , https://citeseerx.ist.psu.edu/document?repid=rep1andtype=pdfanddoi=70080710a6f96bf1c071be14a8b21c17ff8cbc4d
- Description: Converged TDM and packet-based communications systems are a popular topic in computer science and telecommunications arenas. This paper discusses a system called Asterisk that is an open source hybrid TDM and packet voice platform. Asterisk is designed to interface any piece of telephony hardware or software with any telephony application. This makes Asterisk a powerful component that can be easily used in NGN softswitches, conferencing servers and Private Branch eXchanges (PBX). Asterisk has been deployed in the Rhodes University Computer Science Department’s VoIP environment and integrated with our existing H. 323 and SIP packet-based networks. This paper discusses the de-ployment of Asterisk, its interworking with our H. 323 and SIP networks and the functionality it offers in terms of a converged TDM and packet-based communications system.
- Full Text:
- Date Issued: 2003
Capital E for events: ways that work: useful solutions
- Authors: Garman, Anthea
- Date: 2003
- Language: English
- Type: text , article
- Identifier: vital:38359 , http://hdl.handle.net/10520/EJC146297
- Description: You would think being located in a small town in one of the most impoverished provinces in South Africa would be a drawback for making media. But a small town is a reachable, convenient laboratory environment for student journalists - and never more so than when the National Arts Festival comes to Grahamstown during the winter vacation.
- Full Text:
- Date Issued: 2003
- Authors: Garman, Anthea
- Date: 2003
- Language: English
- Type: text , article
- Identifier: vital:38359 , http://hdl.handle.net/10520/EJC146297
- Description: You would think being located in a small town in one of the most impoverished provinces in South Africa would be a drawback for making media. But a small town is a reachable, convenient laboratory environment for student journalists - and never more so than when the National Arts Festival comes to Grahamstown during the winter vacation.
- Full Text:
- Date Issued: 2003
Interrogate the information society:
- Authors: Berger, Guy
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159181 , vital:40275 , https://hdl.handle.net/10520/EJC146276
- Description: If there is one thing journalists should know about the "Information Society", it's this: never use the phrase as if its meaning speaks for itself. This is one of the most slippery and contentious phrases yet to grace contemporary discourse. For a start, why "Information Society" and not "Knowledge Society"? And why "society" and not "economy"? This is not academic semantics. There are wholly different meanings at stake with different implications for journalists, politicians, policy makers and many more.
- Full Text:
- Date Issued: 2003
- Authors: Berger, Guy
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159181 , vital:40275 , https://hdl.handle.net/10520/EJC146276
- Description: If there is one thing journalists should know about the "Information Society", it's this: never use the phrase as if its meaning speaks for itself. This is one of the most slippery and contentious phrases yet to grace contemporary discourse. For a start, why "Information Society" and not "Knowledge Society"? And why "society" and not "economy"? This is not academic semantics. There are wholly different meanings at stake with different implications for journalists, politicians, policy makers and many more.
- Full Text:
- Date Issued: 2003
Pharmaceutical Pictograms: Part 1: Communicating Medicine Information to the Low-literate Patient
- Dowse, Roslind, Ehlers, Martina S
- Authors: Dowse, Roslind , Ehlers, Martina S
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157026 , vital:40080
- Description: To assess the influence of formal education on the interpretation of pharmaceutical pictograms.
- Full Text:
- Date Issued: 2003
- Authors: Dowse, Roslind , Ehlers, Martina S
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157026 , vital:40080
- Description: To assess the influence of formal education on the interpretation of pharmaceutical pictograms.
- Full Text:
- Date Issued: 2003
Pipes, poles and people:
- Authors: Kyazze, Sim
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159153 , vital:40273 , https://hdl.handle.net/10520/EJC146268
- Description: Tina James, a South African ICT consultant, tells the story of Minnie Barendse Kruger who had been struggling to get a Khoisan Cultural Village going in the Eastern Cape. Kruger set up a restaurant where traditional food is prepared, and the Barendse Griquas Trust stepped in and helped set up a multi-purpose Community Centre.
- Full Text:
- Date Issued: 2003
- Authors: Kyazze, Sim
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159153 , vital:40273 , https://hdl.handle.net/10520/EJC146268
- Description: Tina James, a South African ICT consultant, tells the story of Minnie Barendse Kruger who had been struggling to get a Khoisan Cultural Village going in the Eastern Cape. Kruger set up a restaurant where traditional food is prepared, and the Barendse Griquas Trust stepped in and helped set up a multi-purpose Community Centre.
- Full Text:
- Date Issued: 2003
The OSS promise:
- Authors: Kyazze, Sim
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159138 , vital:40271 , https://hdl.handle.net/10520/EJC146251
- Description: For Africa the attraction of open source software (OSS), is obvious. But for once, Internet intellectuals are not simply sounding off to annoy the rich north.
- Full Text:
- Date Issued: 2003
- Authors: Kyazze, Sim
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159138 , vital:40271 , https://hdl.handle.net/10520/EJC146251
- Description: For Africa the attraction of open source software (OSS), is obvious. But for once, Internet intellectuals are not simply sounding off to annoy the rich north.
- Full Text:
- Date Issued: 2003
The stories in the details:
- Authors: Kyazze, Sim
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159177 , vital:40274 , https://hdl.handle.net/10520/EJC146272
- Description: A famous journalism adage is that "the story is in the details". For the world Information Society, those details might be in the mind-blowing technological advances in recent years and the dizzying alternative news sources; and in the increased novelty in story telling.
- Full Text:
- Date Issued: 2003
- Authors: Kyazze, Sim
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159177 , vital:40274 , https://hdl.handle.net/10520/EJC146272
- Description: A famous journalism adage is that "the story is in the details". For the world Information Society, those details might be in the mind-blowing technological advances in recent years and the dizzying alternative news sources; and in the increased novelty in story telling.
- Full Text:
- Date Issued: 2003
Parasitic Cape bees in the northern regions of South Africa: source of the founder population
- Neumann, Peter, Radloff, Sarah E, Hepburn, H Randall
- Authors: Neumann, Peter , Radloff, Sarah E , Hepburn, H Randall
- Date: 2002
- Language: English
- Type: text , Article
- Identifier: vital:6908 , http://hdl.handle.net/10962/d1011861
- Description: Multivariate discriminant analyses of nine standard morphometric characters of honeybee workers were used to track the origin of a social parasitic pseudo-clone of thelytokous laying workers that have invaded colonies of Apis mellifera scutellata in South Africa. Twenty social parasitic workers were sampled from both of two infested A. m. scutellata colonies at two distant apiaries (Graskop and Heilbronn, about 390 km apart) and compared with data obtained from 80 colonies in four different geographical zones (zone I: thelytokous A. m. capensis morphocluster; zone II: natural thelytokous hybrids between A. m. capensis and A. m. scutellata; zone III: thelytokous A. m. scutellata morphocluster; zone IV: an arrhenotokous A. m. scutellata morphocluster). Thelytokous laying workers occur naturally in zones I-III. Highly significant morphometric differences were found among the bees in the four zones. The data support the conclusion that the social parasitic workers belong to the thelytokous A. m. capensis morphocluster. It is most likely that the social parasitic workers originated from the heart of the Cape bee's distribution range in the Western Cape region in zone I. Morphometric analysis makes it feasible to restrict the possible origin of the social parasitic workers from the natural distribution range of thelytoky (approximately 240 000 km2) down to about 12 000 km2, which represents a resolution capacity of about 95%.
- Full Text:
- Date Issued: 2002
- Authors: Neumann, Peter , Radloff, Sarah E , Hepburn, H Randall
- Date: 2002
- Language: English
- Type: text , Article
- Identifier: vital:6908 , http://hdl.handle.net/10962/d1011861
- Description: Multivariate discriminant analyses of nine standard morphometric characters of honeybee workers were used to track the origin of a social parasitic pseudo-clone of thelytokous laying workers that have invaded colonies of Apis mellifera scutellata in South Africa. Twenty social parasitic workers were sampled from both of two infested A. m. scutellata colonies at two distant apiaries (Graskop and Heilbronn, about 390 km apart) and compared with data obtained from 80 colonies in four different geographical zones (zone I: thelytokous A. m. capensis morphocluster; zone II: natural thelytokous hybrids between A. m. capensis and A. m. scutellata; zone III: thelytokous A. m. scutellata morphocluster; zone IV: an arrhenotokous A. m. scutellata morphocluster). Thelytokous laying workers occur naturally in zones I-III. Highly significant morphometric differences were found among the bees in the four zones. The data support the conclusion that the social parasitic workers belong to the thelytokous A. m. capensis morphocluster. It is most likely that the social parasitic workers originated from the heart of the Cape bee's distribution range in the Western Cape region in zone I. Morphometric analysis makes it feasible to restrict the possible origin of the social parasitic workers from the natural distribution range of thelytoky (approximately 240 000 km2) down to about 12 000 km2, which represents a resolution capacity of about 95%.
- Full Text:
- Date Issued: 2002
Reporting indigenous knowledge: the choices they deserve the local is the global
- Authors: Boshoff, Priscilla A
- Date: 2002
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/71176 , vital:29804 , http://doi:10.1006/jmbi.1995.0238
- Description: A few days ago, an interesting article dealing with community development and education came close to being published in a national newspaper. But the editor tossed it back at the surprised journalist, and told him to write it again. Here are some excerpts: Researchers here have recently been facilitating local people to rediscover traditional practices that have been lost through the processes of colonisation and changes in lifestyles. “We are very excited about the ways in which things are being discovered,” said Samuel Mann, research facilitator at the project. “People are beginning to reclaim some of the ways of knowing that still have meaning and relevance to modern everyday life. People are rediscovering the importance of Indigenous Knowledge.” Mba Ngcobo, one of the participants in the project, showed how he and other members of his community had built a grain pit using old traditional knowledge. “It works really well,” he said, “it is amazing how these old ways really work. Our ancestors had marvellous ways of doing things. We can really appreciate the skills that are slowly being lost to us.” Mann explained how the traditional pit storage method produced carbon dioxide that keeps the grain fresh and insect-free for months. “Carbon dioxide storage is now the preferred way of many milling and storage companies to keep grain. It keeps grain fresh without having to resort to insecticides.”
- Full Text:
- Date Issued: 2002
- Authors: Boshoff, Priscilla A
- Date: 2002
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/71176 , vital:29804 , http://doi:10.1006/jmbi.1995.0238
- Description: A few days ago, an interesting article dealing with community development and education came close to being published in a national newspaper. But the editor tossed it back at the surprised journalist, and told him to write it again. Here are some excerpts: Researchers here have recently been facilitating local people to rediscover traditional practices that have been lost through the processes of colonisation and changes in lifestyles. “We are very excited about the ways in which things are being discovered,” said Samuel Mann, research facilitator at the project. “People are beginning to reclaim some of the ways of knowing that still have meaning and relevance to modern everyday life. People are rediscovering the importance of Indigenous Knowledge.” Mba Ngcobo, one of the participants in the project, showed how he and other members of his community had built a grain pit using old traditional knowledge. “It works really well,” he said, “it is amazing how these old ways really work. Our ancestors had marvellous ways of doing things. We can really appreciate the skills that are slowly being lost to us.” Mann explained how the traditional pit storage method produced carbon dioxide that keeps the grain fresh and insect-free for months. “Carbon dioxide storage is now the preferred way of many milling and storage companies to keep grain. It keeps grain fresh without having to resort to insecticides.”
- Full Text:
- Date Issued: 2002
A dinocephalian therapsid fauna on the Ecca–Beaufort contact in Eastern Cape Province, South Africa
- Modesto, S P, Rubidge, B S, de Klerk, William J, Welman, J
- Authors: Modesto, S P , Rubidge, B S , de Klerk, William J , Welman, J
- Date: 2001
- Language: English
- Type: text , Article
- Identifier: vital:6999 , http://hdl.handle.net/10962/d1008355
- Description: Systematic exploration of outcrops of the lowermost Beaufort Group for fossils of the oldest terrestrial vertebrates of South Africa, known only from the Permian age Eodicynodon Assemblage Zone in Western Cape Province, has resulted in the discovery of a therapsid fauna in Eastern Cape Province that is dominated by advanced dinocephalians. The new discoveries include the skull and partial skeleton of a juvenile Anteosaurus, skull and skeletal elements of tapinocephalids, as well as the skull of a scylacosaurid therocephalian. The combined presence of advanced tapinocephalid dinocephalians, the anteosaur Anteosaurus, and scylacosaurid therocephalians suggests that the rocks of the lowermost Beaufort Group in the Eastern Cape Province can be assigned to the Tapinocephalus Assemblage Zone, rather than to the Eodicynodon Assemblage Zone, which appears to be restricted to the southwestern part of the Karoo Basin. This biozone identity permits the recognition of a younger age for the Ecca-Beaufort contact eastwards along the southern margin of the basin, thus demonstrating the diachronous nature of the Ecca-Beaufort contact in the southern Karoo.
- Full Text:
- Date Issued: 2001
- Authors: Modesto, S P , Rubidge, B S , de Klerk, William J , Welman, J
- Date: 2001
- Language: English
- Type: text , Article
- Identifier: vital:6999 , http://hdl.handle.net/10962/d1008355
- Description: Systematic exploration of outcrops of the lowermost Beaufort Group for fossils of the oldest terrestrial vertebrates of South Africa, known only from the Permian age Eodicynodon Assemblage Zone in Western Cape Province, has resulted in the discovery of a therapsid fauna in Eastern Cape Province that is dominated by advanced dinocephalians. The new discoveries include the skull and partial skeleton of a juvenile Anteosaurus, skull and skeletal elements of tapinocephalids, as well as the skull of a scylacosaurid therocephalian. The combined presence of advanced tapinocephalid dinocephalians, the anteosaur Anteosaurus, and scylacosaurid therocephalians suggests that the rocks of the lowermost Beaufort Group in the Eastern Cape Province can be assigned to the Tapinocephalus Assemblage Zone, rather than to the Eodicynodon Assemblage Zone, which appears to be restricted to the southwestern part of the Karoo Basin. This biozone identity permits the recognition of a younger age for the Ecca-Beaufort contact eastwards along the southern margin of the basin, thus demonstrating the diachronous nature of the Ecca-Beaufort contact in the southern Karoo.
- Full Text:
- Date Issued: 2001