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Now showing items 2147-2166 of 11167

The daily-resolved Southern Ocean mixed layer: Regional contrasts assessed using glider observations

Author: Du Plessis, MD ; Swart, S ; Biddle, LC ; Giddy, IS ; Monteiro, Pedro M ; Reason, CJC ; Thompson, AF ; Nicholson, Sarah-Anne Date: Apr 2022 Water mass transformation in the Southern Ocean is vital for driving the large-scale overturning circulation, which transports heat from the surface to the ocean interior. Using profiling gliders, this study investigates the role of summertime ... Read more
DAISY, the best way to author sign language publications

Author: Olivrin, G ; Van Der Walt, W Date: Sep 2009 This paper investigates how video playback can be introduced in DAISY by building on the DAISY 3 standard and on existing open-source software. The paper presents the process of creating and authoring a video-based sign language DAISY publication ... Read more
Dam that social networking: connecting South Africa's major dams to social media

Author: Butgereit, L Date: Oct 2011 South Africa is a semi-arid country and water resources need to be monitored. The Internet of Things is the phenomenon of more and more things (as opposed to people and services) becoming connected to the Internet. This paper describes a ... Read more
Damage invariant and high security acquisition of the internal fingerprint using optical coherence tomography

Author: Darlow, Luke N ; Singh, Ann ; Moolla, Yaseen ; Ramokolo, Lesiba R ; Van Wyk, R ; Botha, Natasha ; Webb-Ray, L Date: Nov 2016 Fingerprints are widely used for biometric authentication, identification, and access control. However, most current acquisition devices obtain fingerprints from the surface of the skin and are thus inherently restricted by the surface 2D ... Read more
Dammarane-type triterpenoids with anti-cancer activity from the leaves of Cleome gynandra

Author: Mzondo, Buntubonke ; Dlamini, Nomusa ; Malan, FP ; Labuschagne, Philip W ; Bovilla, VR ; Madhunapantula, SV ; Maharaj, V Date: Jun 2021 Three dammarane-type triterpernoids including two new ones, cleogynones A and B (1 and 2), were isolated from the leaves of Cleome gynandra. The structures of the new triterpenoids were elucidated by spectroscopic data analysis and confirmed ... Read more
Dangers of social networking sites- the propagation of malware

Author: Labuschagne, WA ; Veerasamy, Namosha Date: Jul 2013 The paper will illustrate the dangers of social networking malware through examples. In addition, the paper will discuss propagation techniques used in social networking malware. The aim of the paper is to create user awareness to minimise ... Read more
Dark adaptation time for humans, after viewing a target illuminated with two different types of light sources

Author: Baumbach, J ; Coetzee, EM ; Sieberhagen, RH ; Jonker, CR Date: Jul 2011 The differences in scotopic recovery time between LED illuminators and a tungsten-halogen illuminator was investigated. The spectral distribution and the luminous intensity distribution of all the supplied illuminators were measured. The ... Read more
The dark side of Web 2.0

Author: Labuschagne, WA ; Eloff, MM ; Veerasamy, Namosha Date: Sep 2012 Social networking sites have increased in popularity and are utilized for many purposes which include connecting with other people, sharing information and creating content. Many people on social networking sites use these platforms to express ... Read more
Data aggregation in software-defined wireless sensor networks: A review

Author: Egidius, PM ; Abu-Mahfouz, Adnan MI ; Ndiaye, M ; Hancke, GP Date: Feb 2019 Wireless Sensor Networks (WSN) have made a substantial impact in our lives by allowing us to communicate, monitor certain environments thus enabling us to build systems such as software-defined wireless sensor networks (SDWSN) which are ... Read more
Data aggregation schemes for maximal network lifetime: Review

Author: Molose, R ; Isong, B ; Dladlu, N ; Abu-Mahfouz, Adnan MI Date: Jul 2022 Energy consumption and the network lifespan of wireless sensor networks (WSNs) are greatly affected by data transmission and retransmission. The challenge follows the energy limitation of sensor nodes with replaceable batteries. Albeit several ... Read more
Data characteristics that determine classifier performance

Author: Van der Walt, Christiaan M ; Barnard, E Date: Nov 2006 The relationship between the distribution of data, on the one hand, and classifier performance, on the other, for non-parametric classifiers has been studied. It is shown that predictable factors such as the available amount of training data ... Read more
Data collection, transfer and the development of national standards – critical components necessary for the success of a GIS in South Africa

Author: Cooper, Antony K Date: 20 Apr 2006 In this article, it talks about Data collection, transfer and the development of national standards – critical components necessary for the success of a GIS in South Africa. It again includes National Government’s responsibility in the creation ... Read more
Data content standards in Africa

Author: Cooper, Antony K ; Govender, S ; Lance, K ; Tieszen, LL Date: Apr 2005 Data content standards tend to be more accessible. Easier to understand. Used directly by many end users. Immediately applicable to Africa. More susceptible to culture and language – Hence, more important to have local standards Read more
A Data Governance Maturity Evaluation Model for government departments of the Eastern Cape province, South Africa

Author: Olaitan, O ; Herselman, Martha E ; Wayi, N Date: Jul 2019 Background: There are different uses of data in an organisation. Data are required for reporting purposes, decision-making and providing access to vital facts to enable work processes across business units. Data are central to an organisation’s ... Read more
Data imputation in wireless sensor networks using a machine learning-based virtual sensor

Author: Matusowsky, M ; Ramotsoela, DT ; Abu-Mahfouz, Adnan MI Date: May 2020 Data integrity in wireless sensor networks (WSN) is very important because incorrect or missing values could result in the system making suboptimal or catastrophic decisions. Data imputation allows for a system to counteract the effect of ... Read more
Data integrity: Challenges in health information systems in South Africa

Author: Thulare, Tumiso ; Herselman, Martha E ; Botha, Adèle Date: Dec 2020 Poor system use, including inappropriate design of health information systems, causes difficulties in communication with patients and increased time spent by healthcare professionals in recording the necessary health information for medical ... Read more
Data mining techniques for distributed denial of service attacks detection in the internet of things: A research survey

Author: Machaka, P ; Nelwamondo, Fulufhelo V Date: Aug 2016 This chapter reviews the evolution of the traditional internet into the Internet of Things (IoT). The characteristics and application of the IoT are also reviewed, together with its security concerns in terms of distributed denial of service ... Read more
‘Data Poisoning’ – Achilles heel of cyber threat intelligence systems

Author: Mahlangu, Thabo V ; January, Sinethemba ; Mashiane, Charmaine T ; Dlamini, Thandokuhle M ; Ngobeni, Sipho J ; Ruxwana, Lennox N Date: Feb 2019 In the cyberspace, system defenders might have an idea of their own cybersecurity defense systems, but they surely have a partial view of the cyberspace battlefield and almost zero knowledge of the attackers. Evidently, the arm's race between ... Read more
A data privacy model based on Internet of Things and cyberphysical systems reference architectures

Author: Baloyi, Ntsako ; Kotzé, P Date: Sep 2018 Data privacy concerns in the Internet of Things (IoT) and cyberphysical systems (CPS) are real, valid and accentuated. In this paper it is argued that data privacy compliance in IoT and CPS should be addressed at both technical and non-technical ... Read more
Data requirements for speaker independent acoustic models

Author: Badenhorst, JAC ; Davel, M Date: Nov 2008 When developing speech recognition systems in resource-constrained environments, careful design of the training corpus can play an important role in compensating for data scarcity. One of the factors to consider relates to the speaker composition ... Read more

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