List of Titles

Quick View

A Comparative Analysis of Speaker and Headphone-Based Immersive Audio in VR and Gaming Applications:

- Marais, Kyle, Foss, Richard

Authors: Marais, Kyle , Foss, Richard
Date: 2023
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/426705 , vital:72384 , https://ieeexplore.ieee.org/abstract/document/10289435
Description: Precise and accurate audio spatialization is crucial for gaming and Virtual Reality (VR) applications, as it is an essential aspect of the immersion experienced by users. When the audio of a virtual environment is synchronized with its visual sources and localized accurately, users are more likely to feel deeply engaged and suspend their disbelief. Audio Middleware software is commonly used in cooperation with game engines to meet the audio requirements of virtual environments created by game developers. This research paper presents a comparative analysis of speaker-and headphone-based immersive audio systems within the context of VR. The research findings indicate that, despite the headphone-based system offering more accurate audio localization and a higher ‘perceived audio quality’, the speaker-based system resulted in a greater sense of ‘immersion.’.
Full Text:
Date Issued: 2023

Quick View

A comparison of genetic structure in two low-dispersal crabs from the Wild Coast, South Africa

- Qhaji, Y, Jansen van Vuuren, Bettine, Papadopoulos, Isabelle, McQuaid, Christopher D, Teske, Peter R

Authors: Qhaji, Y , Jansen van Vuuren, Bettine , Papadopoulos, Isabelle , McQuaid, Christopher D , Teske, Peter R
Date: 2015
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/444770 , vital:74297 , https://doi.org/10.2989/1814232X.2015.1077474
Description: The Wild Coast in south-eastern South Africa is strongly influenced by the warm, southward-flowing Agulhas Current. This current has a significant impact on dispersal in the coastal biota of the region, and facilitates high levels of connectivity among populations. However, it is not known how the region's high-velocity hydrology affects genetic population structure in endemic estuarine species, populations of which are frequently isolated from the sea. Here, we compared genetic structure in two estuarine crabs of the family Hymenosomatidae. Both are presumed to have low dispersal potential, but they differ in terms of their life histories. Hymenosoma longicrure has abbreviated larval development and can complete its entire life cycle within estuaries, whereas Neorhynchoplax bovis is a direct developer that lacks planktonic larvae.
Full Text:
Date Issued: 2015

Quick View

A comparison of three techniques for fluorochrome marking of juvenile Clarias gariepinus otoliths

- Wartenberg, Reece, Booth, Anthony J, Weyl, Olaf L F

Authors: Wartenberg, Reece , Booth, Anthony J , Weyl, Olaf L F
Date: 2011
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/123520 , vital:35450 , https://doi.10.3377/004.046.0119
Description: African sharptooth catfish, Clarias gariepinus (Burchell 1822), is widely distributed with a natural range that extends from southern Turkey to the Orange River, South Africa (Skelton 2001). In addition to translocations within its southerly range (Cambray 2003), Cambray (2005) noted that as a result of poor aquaculture practices and introductions from a number of unknown sources, C. gariepinus has now invaded South America, Europe, Asia, and Australia. Its life history characteristics include a fast growth rate to a maximum length of 1300mmtotal length (TL) (Bruton 1976), a high fecundity, an omnivorous diet and the ability to breathe air (de Moor & Bruton 1988; Cambray 2003). Understanding the biology and population dynamics of this invader would assist in its management and possibly eradication.
Full Text:
Date Issued: 2011

Quick View

A description of gametogenesis in the panga Pterogymnus laniarius (Pisces: Sparidae) with comments on changes in maturity patterns over the past two decades

- Booth, Anthony J, Hecht, Thomas

Authors: Booth, Anthony J , Hecht, Thomas
Date: 1997
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/446930 , vital:74571 , https://www.ajol.info/index.php/az/article/view/154565
Description: A description of gametogenesis in the panga Pferogymnus laniarius, a common endemic seabream species inhabiting the Agulhas Bank, South Africa, is presented. After sexual maturity, oogenesis and spermatogenesis continued throughout the year and were found to be similar to these processes in other seabream species and teleosts in general. Analysis of maturity data over the past two decades revealed a significant change in both age and size-at-maturity, a response to fishing pressure.
Full Text:
Date Issued: 1997

Quick View

A Framework for the Management of Operator Policies and User Preferences for Service Compositions in the IP Multimedia Subsystem

- Tsietsi, Mosiuoa, Terzoli, Alfredo, Wells, George C

Authors: Tsietsi, Mosiuoa , Terzoli, Alfredo , Wells, George C
Date: 2011
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/430680 , vital:72708 , https://ieeexplore.ieee.org/abstract/document/6032212
Description: The IP Multimedia Subsystem (IMS) is a telecommunication middleware platform with robust service features that enables the delivery of a wide range of services to mobile network subscribers. Network operators are encouraged to develop services from service building blocks in order to avoid redundancies by re-using existing functionality. In this environ-ment, operators must be able to control the service execution chain in order to prevent undesirable interactions from occurring between indi-vidual building blocks. It is also in their interests to provide subscribers with personalisation options so that they can modify service composi-tions and define their own preferences for how they would like their ser-vices to behave during live sessions. This paper describes a solution for these challenges that involves the storage of service information in an XDMS and allows operator staff and subscribers to manage this in-formation using the XCAP protocol. The ETSI-defined XCAP applica-tion usage named simservs was chosen to demonstrate an application usage that can be used to create service compositions in XML format. A prototype is described that uses components of the open source Mo-bicents project to verify the suitability of the design. This work is part of a larger effort aimed at modeling interaction management in the IMS through the use of a service broker that is part of an extended IMS ser-vice layer (EISL). The service broker's functional and structural architec-ture have not yet been standardised.
Full Text:
Date Issued: 2011

Quick View

A high-level architecture for efficient packet trace analysis on gpu co-processors

- Nottingham, Alastair, Irwin, Barry V W

Authors: Nottingham, Alastair , Irwin, Barry V W
Date: 2013
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/429572 , vital:72623 , 10.1109/ISSA.2013.6641052
Description: This paper proposes a high-level architecture to support efficient, massively parallel packet classification, filtering and analysis using commodity Graphics Processing Unit (GPU) hardware. The proposed architecture aims to provide a flexible and efficient parallel packet processing and analysis framework, supporting complex programmable filtering, data mining operations, statistical analysis functions and traffic visualisation, with minimal CPU overhead. In particular, this framework aims to provide a robust set of high-speed analysis functionality, in order to dramatically reduce the time required to process and analyse extremely large network traces. This architecture derives from initial research, which has shown GPU co-processors to be effective in accelerating packet classification to up to tera-bit speeds with minimal CPU overhead, far exceeding the bandwidth capacity between standard long term storage and the GPU device. This paper provides a high-level overview of the proposed architecture and its primary components, motivated by the results of prior research in the field.
Full Text:
Date Issued: 2013

Quick View

A history of southern African research relevant to forensic entomology

- Williams, Kirstin A, Villet, Martin H

Authors: Williams, Kirstin A , Villet, Martin H
Date: 2006
Language: English
Type: text , Article
Identifier: vital:6909 , http://hdl.handle.net/10962/d1011862
Description: Entomological forensic evidence has been used in southern Africa for decades but explicitly forensic research began in southern Africa only 26 years ago. Although applicable local research has accumulated since 1921, it is scattered in a diverse literature or unpublished. Some overseas research has also touched on local species. This review uses a historical approach to synthesize the southern African literature and to illustrate the cross-disciplinary, opportunistic nature of forensic entomology. Distinct phases of research focused on agriculture (1921-1950), medicine (1952- 1965), ecology (1968-1990) and forensics (1980-2005), but systematics spanned the entire period and tended to be ad hoc. Few scientists were involved, situated at geographically distant locations and with widely disparate research interests. The review concludes with an overview of southern African entomologists who have been involved in medico-legal investigations, and a critical evaluation of the past and future of the discipline locally.
Full Text:
Date Issued: 2006

Quick View

A hundred years of History at Rhodes University: some reflections on the department's centenary colloquium, September 2011 reminiscences

- Maylam, Paul

Authors: Maylam, Paul
Date: 2012
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/450012 , vital:74875 , https://www.scielo.org.za/pdf/hist/v57n1/09.pdf
Description: In 1911, W.M. Macmillan, who would become the most distinguished South Africanist historian of his generation, was appointed as the first lecturer in History (and Economics) at what was then Rhodes University College. To mark the centenary of its founding the Rhodes History Department held a two-day colloquium on 16-17 September 2011. The event brought together almost 50 current and former staff and students. Some delivered papers reflecting on the history of the department; others spoke about their present research interests. Among the participants there was a representative from every decade since the 1940s - Rodney Davenport having been a student in the department from 1943.
Full Text:
Date Issued: 2012

Quick View

A leopard's favourite spots: habitat preference and population density of leopards in a semi-arid biodiversity hotspot

- Mann, Gareth K H, O'Riain, M Justin, Parker, Daniel M

Authors: Mann, Gareth K H , O'Riain, M Justin , Parker, Daniel M
Date: 2020
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/148584 , vital:38752 , https://doi.org/10.1016/j.jaridenv.2020.104218
Description: Leopards (Panthera pardus) are the only free-ranging large predators to still occur naturally throughout much of Africa, but are vulnerable to habitat loss, ecosystem degradation and persecution. We used a systematic camera trap survey covering an area of ∼3100 km2 in the Little Karoo, a semi-arid biodiversity hotspot in South Africa, to assess the impacts of land use and habitat type on leopard density. Camera data were supplemented by opportunistic scat collection to produce a habitat suitability model. We used a habitat suitability model to inform spatially explicit capture-recapture models used to estimate population density. We recorded 152 independent photographs of 27 individually recognizable leopards at 54 camera stations and collected scats from a further 76 locations. Our habitat suitability model showed that primary productivity and vegetation type were the best predictors of leopard habitat suitability. Our best performing population density model allowed for detection and movement of individuals to vary according to sex, and estimated population density at 1.26 (SE ± 0.25) leopards/100 km2.
Full Text:
Date Issued: 2020

Quick View

A lightwave 3d plug-in for modeling long hair on virtual humans

- Patrick, Deborah, Bangay, Shaun D

Authors: Patrick, Deborah , Bangay, Shaun D
Date: 2003
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/432953 , vital:72916 , https://doi.org/10.1145/602330.602360
Description: Multimedia applications today make use of virtual humans. Generating realistic virtual humans is a challenging problem owing to a number of factors, one being the simulation of realistic hair. The difficulty in simulating hair is due to the physical properties of hair. The average human head holds thousands of hairs, with the width of each hair often smaller than the size of a pixel. There are also complex lighting effects that occur within hair. This paper presents a LightWave 3D plug-in for modeling thousands of individual hairs on virtual humans. The plug-in allows the user to specify the length, thickness and distribution of the hair, as well as the number of segments a hair is made up of. The plug-in is able to add hairs to a head model, which the user then modifies to define a hairstyle. The hairs are then multiplied by the plug-in to produce many hairs. By providing a plug-in that does most of the work and produces realistic results, the user is able to produce a hairstyle without modeling each individual strand of hair. This greatly reduces the time spent on hair modeling, and makes the possibility of adding realistic long hair to virtual humans reasonable.
Full Text:
Date Issued: 2003

Quick View

A new snake eel, Ophichthus bennettai, (Pisces: Ophichthidae) from off western South Africa

- McCosker, John E, J.L.B. Smith Institute of Ichthyology

Authors: McCosker, John E , J.L.B. Smith Institute of Ichthyology
Date: 1986-07
Subjects: Snake eels -- South Africa
Language: English
Type: text , book
Identifier: http://hdl.handle.net/10962/70206 , vital:29634 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 39 , A new species of snake-eel, Ophichthus bennettai, Subfamily Ophichthinae, is described from a single specimen trawled in 372 m off western South Africa. It differs from all other ophichthines in its combination of mostly uniserial teeth, uniform brown coloration, and vertebral formula 17-63-167.
Full Text:
Date Issued: 1986-07

Quick View

A new species of the fish genus Pontinus (Scorpaeniformes: Scorpaenidae) from off Natal, South Africa

- Eschmeyer, William N, J.L.B. Smith Institute of Ichthyology

Authors: Eschmeyer, William N , J.L.B. Smith Institute of Ichthyology
Date: 1983-05
Subjects: Fishes -- South Africa , Scorpionfishes -- South Africa
Language: English
Type: text , book
Identifier: http://hdl.handle.net/10962/69991 , vital:29605 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 28 , Pontinus nigerimum is described as a new species, the first of this genus from the Indian Ocean. This species is known only from one specimen collected off Natal in 146 m . It is characterized by having a black band encircling the base of the long supraocular tentacles.
Full Text:
Date Issued: 1983-05

Quick View

A privacy and security threat assessment framework for consumer health wearables

- Mnjama, Javan, Foster, Gregory G, Irwin, Barry V W

Authors: Mnjama, Javan , Foster, Gregory G , Irwin, Barry V W
Date: 2017
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/429217 , vital:72568 , https://ieeexplore.ieee.org/abstract/document/8251776
Description: Health data is important as it provides an individual with knowledge of the factors needed to be improved for oneself. The development of fitness trackers and their associated software aid consumers to understand the manner in which they may improve their physical wellness. These devices are capable of collecting health data for a consumer such sleeping patterns, heart rate readings or the number of steps taken by an individual. Although, this information is very beneficial to guide a consumer to a better healthier state, it has been identified that they have privacy and security concerns. Privacy and Security are of great concern for fitness trackers and their associated applications as protecting health data is of critical importance. This is so, as health data is one of the highly sort after information by cyber criminals. Fitness trackers and their associated applications have been identified to contain privacy and security concerns that places the health data of consumers at risk to intruders. As the study of Consumer Health continues to grow it is vital to understand the elements that are needed to better protect the health information of a consumer. This research paper therefore provides a conceptual threat assessment framework that can be used to identify the elements needed to better secure Consumer Health Wearables. These elements consist of six core elements from the CIA triad and Microsoft STRIDE framework. Fourteen vulnerabilities were further discovered that were classified within these six core elements. Through this, better guidance can be achieved to improve the privacy and security of Consumer Health Wearables.
Full Text:
Date Issued: 2017

Quick View

A programme for the Alliance

- Congress of South African Trade Unions

Authors: Congress of South African Trade Unions
Date: 1996-11
Subjects: Uncatalogued
Language: English
Type: text , pamphlet
Identifier: http://hdl.handle.net/10962/105785 , vital:32568
Description: BACKGROUND TO THE ALLIANCE From Cosatu’s inception in 1985, the federation developed a close association with the Congress movement. Conditions in the country dictated the need to go beyond bread and butter issues to embrace national and class struggle. This perspective was formally endorsed with Cosatu’s adoption of the Freedom Charter in 1987. The 1987 Congress agreed Cosatu should build alliances with mass-based organisations with a track record of struggle and whose principles did not conflict with those of Cosatu. After the unbanning of the liberation movement, Cosatu’s 1991 Congress resolved that the Federation should join the ANC and SACP in alliance in place of Sactu, thus becoming part of the Tripartite Alliance as we know it today. It was understood that this Alliance , here put any information that you think is important but there is no field for it, if there isnt remove the field
Full Text:
Date Issued: 1996-11

Quick View

A proposed prioritization system for the management of invasive alien plants in South Africa

- Robertson, Mark P, Villet, Martin H, Fairbanks, Dean H K, Henderson, L, Higgins, Simon I, Hoffmann, John H, Le Maitre, David C, Palmer, Anthony R, Riggs, I, Shackleton, Charlie M, Zimmermann, Helmuth G

Authors: Robertson, Mark P , Villet, Martin H , Fairbanks, Dean H K , Henderson, L , Higgins, Simon I , Hoffmann, John H , Le Maitre, David C , Palmer, Anthony R , Riggs, I , Shackleton, Charlie M , Zimmermann, Helmuth G
Date: 2003
Language: English
Type: Article
Identifier: vital:6911 , http://hdl.handle.net/10962/d1011872
Description: Every country has weed species whose presence conflicts in some way with human management objectives and needs. Resources for research and control are limited, so priority should be given to species that are the biggest problem. The prioritization system described in this article was designed to assess objectively research and control priorities of invasive alien plants at a national scale in South Africa. The evaluation consists of seventeen criteria, grouped into five modules, that assess invasiveness, spatial characteristics, potential impact, potential for control, and conflicts of interest for each plant species under consideration. Total prioritization scores, calculated from criterion and module scores, were used to assess a species' priority. Prioritization scores were calculated by combining independent assessments provided by several experts, thus increasing the reliability of the rankings. The total confidence score, a separate index, indicates the reliability and availability of data used to make an assessment. Candidate species for evaluation were identified and assessed by several experts using the prioritization system. The final ranking was made by combining two separate indices, the total prioritization score and the total confidence score. This approach integrates the plant's perceived priority with an index of data reliability. Of the 61 species assessed, those with the highest ranks (Lantana camara, Chromolaena odorata and Opuntia ficus-indica) had high prioritization and high confidence scores, and are thus of most concern. Those species with the lowest ranks, for example, Harrisia martinii, Opuntia spinulifera and Opuntia exaltata, had low prioritization scores and high confidence scores, and thus are of least concern. Our approach to ranking weeds offers several advantages over existing systems because it is designed for multiple assessors based on the Delphi decision-making technique, the criteria contribute equally to the total score, and the system can accommodate incomplete data on a species. Although the choice of criteria may be criticized and the system has certain limitations, it appears to have delivered credible results.
Full Text:
Date Issued: 2003

Quick View

A Prototyping Environment for Investigating Context Aware Wearable Applications.

- Tsegaye, Melekam, Bangay, Shaun D, Terzoli, Alfredo

Authors: Tsegaye, Melekam , Bangay, Shaun D , Terzoli, Alfredo
Date: 1999
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/432783 , vital:72900 , https://www.cs.ru.ac.za/research/g98t4414/static/papers/wearprototsegaye05.pdf
Description: In this paper we introduce the concept of a contextaware, wearable application prototyping environment, which can be used to support research into new wearable applications. We also present an initial specification for such an environment and show how different types of sensors can be modelled to produce data that describes a given context scenario using our prototyping approach.
Full Text:
Date Issued: 1999

Quick View

Acceptance of ambulatory blood pressure monitoring in a semi-rural population in South Africa:

- Chiwanza, Farisai, Irwin, Yoland, Dowse, Roslind

Authors: Chiwanza, Farisai , Irwin, Yoland , Dowse, Roslind
Date: 2020
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/157072 , vital:40084 , DOI: https://doi.org/10.4102/hsag.v25i0.1336
Description: Ambulatory blood pressure monitoring is a valuable tool that helps in providing an insight into the diagnosis and management of hypertension; however, no evidence exists of its acceptance in the diverse South African population. We assessed the acceptance of an ambulatory blood pressure monitor in patients attending public sector primary health care (PHC) clinics. Five PHC clinics in the Makana subdistrict in the Eastern Cape.
Full Text:
Date Issued: 2020

Quick View

Showing items 1 - 20 of 238