Information Communication Technology

Permanent URI for this community

https://hdl.handle.net/10352/157

Browse

Now showing 1 - 20 of 55

Computer literacy as additional empowerment mechanism in learning programmes
(2004-01) Van Staden, A; Hoffmann, E. C.
The world of digital interactivity, of computers, of cyberspace and the "e-revolution', is making computer literacy more indispensable than ever. There is an increasing demand for ICT skills worldwide- South Africa is not alone in identifying shortages. The information and communication technology in South Africa is exacerbated by emigration on the one hand and the previously disadvantaged learners on the other hand. With an education system that is stretched, higher education has not kept pace with information and communication technology training in South Africa, therefore learners display a shortcoming of basic computer skills. The purpose of this study is to emphasise the importance of implementing computer literacy training throughout the entire learning programme of learners at higher education institutions. Learners randomly selected from the Faculty of Management Sciences, Vaal University of Technology, indicated their computer literacy via questionnaires and levels of experience. It is clear that the abilities of the learners are not sufficient to ensure that they are computer literate or that they will be effective users in the workplace. This study results in a powerful argument in support of the extension of continued growth in computer usage in the workplace.
Secretary versus office manager : a paradigm shift
(2004-02) Wilkinson, Judith Levine; Garnett, A; Buys, C.
The objectives of this research project were primarily to determine the requirements of commerce and industry for competent office managers, to contribute to the curriculum development of information administration, to facilitate action learning (AL) in information administration, and by making changes in training to empower learners to become competent office managers. The influence of training and development of office managers is explained. The National Qualification Framework (NQF) integrates training and education in business and management on all levels. An important aspect is, that professional institutes, education and training institutions and other stakeholders, are combining experience to collectively benefit learners, employers, professions and the economy as a whole. A combination design of both quantitative (traditional) research and qualitative (action) research, including two questionnaires (open-ended and closed), interviews, observations, focus groups and a case study, were used. This study proved the relevance of office management education, by way of the demand for a formal qualification by commerce and industry, as a primary result of the phenomenal change in technology and the need for multi-skilled office managers. A contribution to the training of office managers concerning the following aspects was made: A profile for an office manager, as well as highlighting the need for training, curriculum development, and portfolio development
Combating the corporate paper war: optimising electronic mail and electronic filing
(2006-11) Bothma, Marchelle Marelize; Hoffmann, E. C.
The primary objective of this research project was primarily to investigate filing methods and mailing practices in the computer support or administrative environment with specific focus on the abuse of paper. The research design consisted of an exploratory investigation in selected Higher Education Institutions in the Province of Gauteng whereby a structured questionnaire was used as a measuring instrument. The investigation was sub-divided into two categories, namely, paper-based filing systems and mailing systems as opposed to electronic filing and mailing systems. In the empirical findings, analysis and interpretations, correlation and cross-tabulation were done on all sets of variables in order to determine whether any meaningful associations could be found. With reference to the title of this study "Combating the corporate paper war: optimising electronic mail and electronic filing", it has been proven that the war against paper abuse is far from over. Perceptions regarding a future paperless office and assumptions that technology such as the electronic mail facility and electronic filing could assist organisations to combat paper abuse were unfounded, due to a lack of guidance and control measures in the corporate environment. Consequently, it is recommended that an e-filing and e-mailing model be created and followed in conjunction with specified computer software features in order to counteract the abuse of paper. Follow-up research could focus on electronic filing methods versus scanning of documents for filing purposes.
A model to reduce the divide between South African secondary institutional skills and knowledge, and the entrance requirements for an information technology diploma course
(2008) Baxter, Roger; Lombard, A.; Jordaan, A.
Historically, access to information technology (IT) in South Africa educational institutions has been socially stratified. As a result, many new learners seeking to enter South African tertiary institutions fail to meet the requirements of their preferred course and institution. In 2003, the Department of Information and Corrununications Technology at the Vaal University of Technology (VUT), in conjunction with the National Institute for Information Technology (NIIT), an internationally recognised IT organisation, introduced a short course named the Information Technology Boot Camp (ITBC). This course is now known as the Introduction to Information Technology course (Intro-to-IT). The course is targeted at learners who want to study the IT diploma at the VUT but, who as a result of their Matriculation marks, do not meet the VUT's entrance requirements. The aim of the course is to prepare and qualify these learners for possible acceptance into the IT diploma at the VUT. Although the Intro-to-IT course has impacted positively on the VUT, research has found that learners progressing from the Intro-to-IT course into the IT diploma course experience difficulties in solving programming problems in a logical way. Therefore, the failure rate in Development Software I, a first-semester programming subject, is relatively high. The model described in this study encompasses alterations (implemented and still to be implemented) to the syllabus and content of the Intro-to-IT course, changes to the learning methods and time frames for subjects, and the measurement of these changes in comparison to previous results. The model also includes a software program, which will assess the Intro-to-IT applicants, store results and provide analytical data on all learners' marks and results for the Intro-to-IT short course at the VUT. This model is designed to provide the necessary skills, knowledge and basic logic required to allow successful Intro-to-IT learners the opportunity of success when they enter the VUT's IT diploma stream.
Validity, reliability and fairness of item measurements attained by a comprehensive computer-assisted assessment tool
(2010-11-01T07:40:49Z) van der Merwe, Preller Josefus
The sole purpose of a test is to make a measurement. Assessment is very much a process of measurement, whether the outcome is used for baseline, diagnostic, formative or summative purposes. When measurement is taken, in whatever form, a score is obtained. The score that is obtained forms the important part of assessment, because this score determines the outcome of the assessment, the decisions that are to be made regarding the student’s progress, curriculum changes and the evaluation of a course as a whole. Although a score is obtained from a test, the analysis thereof is frequently much neglected. The use of computers in education is not a new concept. The first computer application goes back a long way when computers were first used to do psychological testing. It then became clear that computers can be applied to more fields in education, especially in the field of testing. In the early days real progress was slow, since computers were expensive and were only used in large companies. However, the scenario has changed with the widespread availability of personal computers that has enabled educators to focus on the appropriate role of computerisation in the development, administration, scoring and interpretation of tests. The main objective of this study is to show the major advantage of using computers as a comprehensive assessment tool and to demonstrate the ability to construct and ‘bank’ test items to subsequently produce a standardised test. An added advantage was the computer’s ability to administer tests to students and manage student progress records. The research findings indicate that a Comprehensive Computer-Assisted Assessment Tool (CCAT) has the potential to contribute to the enhancement of assessment and that it can enable educators to prepare valid, reliable and fair test items which were more difficult and time-consuming without technology.
The use of visualization of corporate data in strategic Information and Communications Technology industrialization
(Vaal University of Technology, 2013-02-20) Dippenaar, Francois; Conradie, P., Dr.
Global companies tend to have problems in knowing the systems, assets and resources they have within their global footprint. This tends to be costly to the company as there tends to be purchases of the same systems, assets and resources that are already available in another business unit or department within the company. This leads to money being wasted on research, procurement and/or training, to name a few. You can't manage what you don't know about. This thesis will show how the visualisation of corporate data is possible and has sustainable benefit to a company. Knowing the status of the Information and Communications Technology (ICT) environment in a company at some point in time is crucial in planning and implementing strategies with the future in mind. Global View, which will be explained in this thesis, is key in facilitating the extracting of information from all the sites globally and presenting the information in a logical and structured way. Information gathering from these sites using Global View needs to be done in an auditing fashion with the focus on accurate and precise information with an option which would allow the audit to be a continuous and automatic process. Global View is a tool to facilitate the implementation of ICT Industrialization through a process of gathering the relevant ICT information worldwide with specific reference to each site. Global View displays the relevant information from systems, assets, resources and environments in an easily accessible format. The functionality that is built into the concept in this thesis is the geographical and geospatial orientation which is linked to the relevant sites as well as time references related to Greenwich Mean Time to make users aware of differences in time when communicating with people in other countries either individually or multiple sites simultaneously.
The cognitive impact of the implementation of an entry level certificate in information technology
(2013-07-18) Van Staden, Corne Johandia; Du Plessis, Linda; Janse van Rensburg, Gail
Research has found that learners find it difficult to solve programming problems in a logical way, therefore the failure rate in Programming I is high. The Entry-level Certificate in Information Technology was introduced as an intervention to address this problem. Four aspects were focused on in the Entry-level Certificate in Information Technology, namely English comprehension, academic competency, numerical skills and the problem-solving skills of learners. Basic computer literacy was the common theme used throughout the Information Technology Boot Camp (ITBC) to address the above-mentioned aspects, in order to broaden access to the Vaal University of Technology (VUT). The research indicates that English comprehension is a very important component of the Information and Communication Technology (ICT) modules, and that it is important for learners to have an English proficiency level of grade 12 before enroUing for a diploma in I CT. The ICT and numerical skills modules also narrowed the gap between secondary and tertiary education, by equipping the learners with prior knoWJledge that is crucial for being successful in the ICT diploma. To conclude access was broadened to the VUT and the intervention of the ITBC did impact positively on the cognitive functioning of learners.
Implementing online learning for students of computer end using at VUT
(Vaal University of Technology, 2013-07-19) Van Eck, Rene; Du Plessis, L. A., Prof.; Jordaan, A., Prof.
The personal computer has changed the way people think and live and has found its way into every area of life. The ability to work with computer technology is a requirement for today's world. The number of virtual learning environments (VLE's), is increasing and e-learning has been promoted as a solution for remote education. Computer literacy, the ability to use computers to perform a variety of tasks, is becoming fundamental to the learning process. Students need to be computer literate, because they are expected to use the computer in most of their subjects, by completing projects, perform electronic searches or typing assignments, to name a few. Many of the learners, who enrol at Vaal University of Technology (VUT), do not have this basic skill, and a great number of them do not have their own computers. It is thus still necessary for VUT to offer a subject such as Computer End Using to provide the learners with the basic level of computer literacy. According to the South African Qualifications Authority, computer literacy is on NQF level 4. Although computer literacy is regarded as being at a lower level than the first year in higher education, it remains a vital prerequisite for completing qualifications. It is therefore important that higher education institutions offer training for fundamental computer skills. This is also supported by the National Plan for Higher Education (NPHE), which emphasizes the mainstreaming of academic development. VUT faces a challenge in terms of providing computer literacy training through online learning. The exact skills the students need in order to engage in online learning, are the same skills taught online, subsequently these programmes require motivated learners with fundamental computer skills. The two online learning packages that were investigated in this study were a national product (HS Training) and an international product (SimNet). An informed recommendation was made with regard to the software package that would be most suitable for VUT students to become computer literate through online learning.
A framework for the evaluation of the information system at Eskom
(2014-01) Ramafalo, Mogale Emmanuel; Conradie, Pieter
A reliable and efficient information system (IS) is critical for Eskom so that it is able to manage and meet its energy demands. A reliable power supply provides stakeholders with the confidence that supply of power is managed sustainably, effectively and efficiently. Thus, an information system is integral in the effective and efficient generation, distribution and transmission of electricity. The purpose of the study was to investigate IS evaluation criteria and to develop a comprehensive framework that will serve as basis for IS evaluation across Eskom. The research study additionally investigated IS evaluation methods and instruments that are currently used in Eskom. This study produced an information systems success evaluation framework. The proposed model was built by reviewing well-established information systems success models and information systems theories found in the literature. This research study followed the interpretive research paradigm combining it with qualitative case study. The research findings linked information systems success to top management support, change management process and information quality. The findings of the study alsorevealed that quality of IS department’s service as perceived by users can greatly influence IS success. The results of this study provided enlightening reference benefit for Eskom, which was in line with Eskom’s goal of improving business processes, efficiencies and eliminating waste.
The use of pod casting revision lectures in improving learners' academic performance
(Vaal University of Technology, 2014-04) Rankapola, M. E.; Conradie, P., Dr.
The majority of research studies completed on podcasting technology focused on the acceptance of podcasting technology in the educational settings and the challenges that it poses for higher education institutions and instructors. Very little interest has been accorded to the effect that podcasting could have on the learners‟ academic performance. Utilizing a quasi-experimental non-equivalent group posttest, a wide used research method in the education discipline, the relationship between podcasting technology and academic performance, is investigated. The quasi-experimental was performed based on data collected over a period of 12 months, in which a non-random sample of 150 learners was taken from a population group of 350 management and entrepreneurship undergraduate learners at the Tshwane University of Technology. The sample was separated into two groups, namely the experimental group of 75 students, and the control group of 75 students. Both groups were offered the same subject by the same instructor. Control group learners are learners who have already completed the subject in the first semester before the podcasting technology was introduced in the subject. The experimental group learners are learners who have completed the subject through the support of podcasting technology. The assessment marks for four formal tests of the two groups were compared by means of a t-test to determine the effect of the intervention. The outcomes of the study showed an increase in the overall mean score of the experimental group in comparison to the mean score of the control group. The number of students obtaining distinctions also increased, compared to the control group. These considerations possibly indicate a positive relationship between the availability of podcast lectures and academic performance.
Semantic knowledge extraction from relational databases
(2014-05) Mogotlane, Kgotatso Desmond; Fonou Dombeu, Jean Vincent
One of the main research topics in Semantic Web is the semantic extraction of knowledge stored in relational databases through ontologies. This is because ontologies are core components of the Semantic Web. Therefore, several tools, algorithms and frameworks are being developed to enable the automatic conversion of relational databases into ontologies. Ontologies produced with these tools, algorithms and frameworks needs to be valid and competent for them to be useful in Semantic Web applications within the target knowledge domains. However, the main challenges are that many existing automatic ontology construction tools, algorithms, and frameworks fail to address the issue of ontology verification and ontology competency evaluation. This study investigates possible solutions to these challenges. The study began with a literature review in the semantic web field. The review let to the conceptualisation of a framework for semantic knowledge extraction to deal with the abovementioned challenges. The proposed framework had to be evaluated in a real life knowledge domain. Therefore, a knowledge domain was chosen as a case study. The data was collected and the business rules of the domain analysed to develop a relational data model. The data model was further implemented into a test relational database using Oracle RDBMS. Thereafter, Protégé plugins were applied to automatically construct ontologies from the relational database. The resulting ontologies are further validated to match their structures against existing conceptual database-to-ontology mapping principles. The matching results show the performance and accuracy of Protégé plugins in automatically converting relational databases into ontologies. Finally, the study evaluated the resulting ontologies against the requirements of the knowledge domain. The requirements of the domain are modelled with competency questions (CQs) and mapped to the ontology using SPARQL queries design, execution and analysis against users’ views of CQs answers. Experiments show that, although users have different views of the answers to CQs, the execution of the SPARQL translations of CQs against the ontology does produce outputs instances that satisfy users’ expectations. This indicates that Protégé plugins generated ontology from relational database embodies domain and semantic features to be useful in Semantic Web applications.
An intelligent automatic vehicle traffic flow monitoring and control system
(2015-01) Marie, Theko Emmanuel; Gatsheni, B. N.
Traffic congestion is a concern within the main arteries that link Johannesburg to Pretoria. In this study Matlab function Randperm is used to generate random vehicle speeds on a simulated highway. Randperm is used to mimic vehicle speed sensors capturing vehicle traffic on the highway. Java sockets are used to send vehicle speed to the Road Traffic Control Centre (RTCC)-database server through a wireless medium. The RTCC-database server uses MySQL to store vehicle speed data. The domain controller with active directory together with a certificate server is used to manage and provide security access control to network resources. The wireless link used by speed sensors to transmit vehicle speed data is protected using PEAP with EAP-TLS which employs the use of digital certificates during authentication. A java database connectivity driver is used to retrieve data from MySQL and a multilayer perceptron (MLP) model is used to predict future traffic status on the highway being monitored i.e. next 5 minutes from previous 5 minutes captured data. A dataset of 402 instances was divided as follows: 66 percent training data was used to train the MLP model, 15 percent data used during validation and the remaining 19 percent was used to test the trained MLP model. An excel spreadsheet was used to introduce novel (19 percent data not used during training) data to the trained MLP model to predict. Assuming that the spreadsheet data represent captured highway vehicle data for the last 5 minutes, the model showed 100 percent accuracy in predicting the four classes: congested, out congested, into congested and normal traffic flow. Predicted traffic status is displayed for the motorist on the highway to know. Ability of the proposed model to continuously capture the traffic pattern on the highway (monitor) helps in redirecting (controlling) the highway traffic during periods of congestion. Implementation of this project will definitely decrease traffic congestion across main arteries of Johannesburg. Pollution normally experienced when cars idle for a long time during congestion will be reduced by free highway traffic flow. Frequent servicing of motor vehicles will no longer be required by the motorists. Furthermore the economy of Gauteng and South Africa as a whole will benefit due to increase in production. Consumers will also benefit in obtaining competitive prices from organizations that depend on haulage services.
The use of pair-programming to enhance the academic performance of tertiary level software development students
(2016-04) Kafilongo, Kindu Wa Mulumba; Jordaan, A; Baxter, R.
The number of students passing computer programming modules at Higher Education Institutions (HEIs) in South Africa at first year level is low. Only with the second attempt do most students pass. This delay results in students completing their three-year undergraduate qualification in four or even five years. One potential contribution towards addressing this problem is the introduction of a collaborative (cooperative) pedagogical approach where students develop software in teams, known in the Information Technology (IT) sector as pair-programming. This study endeavoured to investigate the impact of pair-programming on the academic progress of students registered for the Information Technology qualification at HEIs in South Africa. The study warranted the selection of action research as the most appropriate research strategy. Multi-methods data collection was carried out over two consecutive semesters. The data collection methods included a semi-structured interview, observations and empirical assessment. The participants were students registered for the Information Systems module, which focuses on software development. Pair-programming was introduced to one group of software development students, while a second group continued with the normal solo-programming approach. Semi-structured interviews were held with the students before commencement and after completion of the pair-programming intervention, to establish a change, if any, in the academic performance, attitude and enjoyment level of students introduced to pair-programming compared to those who continued with solo-programming. Observations were conducted throughout the course of the practical sessions over both semesters. Empirical assessments were done by means of tests given to both groups of students during the practical sessions, three tests per semester. Data analysis techniques included t-tests and thematic analysis. The findings concluded that pair-programming had a significant positive impact on the academic progress of IT students, including an increase in the enjoyment level and a more positive attitude towards software development.
The use of messaging service applications as an educational support tool in higher education institutions
(2016-04) Matli, Walter; Jordaan, A.
The Green Paper for Post-School Education and Training states that higher education and training institutions are faced with the challenge of teaching underprepared students. Vaal University of Technology (VUT) Ekurhuleni has experienced an increase in the number of underprepared first year students from basic education to higher education, similar to other higher education institutions (HEIs) and training centres, and most of these students are familiar with messaging service applications. The purpose of this research is to determine if messaging service applications have a constructive role to play in supporting tertiary education. A variety of journals, books and other online materials were reviewed to learn and confirm the current information on messaging service applications and electronic communication interaction in higher education. A mixed methods research methodology has been adopted comprising of both qualitative and quantitative research. Data was collected through semi-structured interviews as well as questionnaires with structured questions to address the objectives of the study. A total of 250 questionnaires were distributed to students and the sample (N=212) resulted in a response rate of 84.8%. Interviews were conducted targeting students doing a bridging course in Information Technology. In addition, data was collected from one of the messaging service applications, Whatsapp, for one semester with one class. For the analysis of the data, two theories—Social Presence Theory and Context Awareness Theory—were adopted. This research found that students who partook in the study displayed a positive perception of using messaging service applications in an educational environment. Furthermore, the textual interaction analysis indicates that students were able to successfully interact and use messaging services as educational supporting tool outside the classroom. From the findings a model has been developed which demonstrates how student learning outside the formal classroom learning environment can be supported through the use of messaging service applications. The research contributes to a better understanding of using of messaging service applications as an educational supporting tool in higher education. Messaging service applications enable students to forget about gender and cultural differences; it encourages them to work together as an online community. This research furthermore provides a basis for HEIs and academic leaders to initiate the discussion and consider the possibility of introducing messaging service applications as educational supporting tool outside the classroom.
Electronic portfolios to enhance the learning experience of scholars at private tertiary institutions in South Africa
(Vaal University of Technology, 2016-07) Mapundu, Michael Tonderai; Lombard, A.; Jordaan, A., Prof.
The purpose of this study was to investigate the use electronic portfolios (e-portfolios) in private tertiary institutions in South Africa to enhance the learning experience of scholars. The study adopted an interpretive ontological stance and subjective epistemological stance as the researcher sought to understand how-portfolios can be used to enhance learning. The focus was on understanding people in a social setting though employing field research to collect and interpret data. Action research, in this case employing a pre-test, intervention and post-test limited to a single cycle, was selected as strategy. The empirical part of the study was conducted during the first semester of 2014 (January to May) at a private tertiary university in Gauteng, South Africa. A pre-survey has been conducted before implementation and a post-survey after the implementation of e-portfolios to test the attitude of the participants, where after the results were compared. The pre-test was administered before creating e-portfolios and the post-test towards the end of the semester after developing and maintaining e-portfolios. Questionnaires were used to obtain information such as the attitude of the respondents on learning, assessment, reflection, collaboration and interpersonal communication through the use of e-portfolios. Questionnaires served as the main data collection tool throughout the survey. The sample was selected from first and second year students in the Information Technology faculty, with the sample size n=48. The researcher further collected data through observing subjects and conducting group interviews that were recorded to augment the questionnaire approach and verify the results through triangulation. The questionnaires were distributed to the participants who were given thirty minutes to complete. Responses were made using a five-point Likert scale and open-ended questions. The response rate was outstanding as all 48 subjects participated in the study. The researcher used a mixed-methods approach for this study; SPSS 22.0 was used for quantitative data analysis and thematic analysis was employed for the qualitative data. Reliability for quantitative data was determined using Cronbach’s alpha. Regression analysis was done as well as correlations to determine relationships and associations. To further cement relationships, t-tests and Spearman’s correlation coefficient were employed. Trustworthiness for qualitative data and justification for credibility, dependability, transferability and confirmability were discussed. The results revealed that e-portfolios could be used effectively at private tertiary institutions to enhance the learning experience of scholars as evidenced by the significant statistics obtained in this study.
A framework for analysing the complexity of ontology
(Vaal University of Technology, 2016-11) Kazadi, Yannick Kazela; Okosun, Prof. K.; Fonou-Dombeu, Dr. J. V.
The emergence of the Semantic Web has resulted in more and more large-scale ontologies being developed in real-world applications to represent and integrate knowledge and data in various domains. This has given rise to the problem of selection of the appropriate ontology for reuse, among the set of ontologies describing a domain. To address such problem, it is argued that the evaluation of the complexity of ontologies of a domain can assist in determining the suitable ontologies for the purpose of reuse. This study investigates existing metrics for measuring the design complexity of ontologies and implements these metrics in a framework that provides a stepwise process for evaluating the complexity of ontologies of a knowledge domain. The implementation of the framework goes through a certain number of phases including the: (1) download of 100 Biomedical ontologies from the BioPortal repository to constitute the dataset, (2) the design of a set of algorithms to compute the complexity metrics of the ontologies in the dataset including the depth of inheritance (DIP), size of the vocabulary (SOV), entropy of ontology graphs (EOG), average part length (APL) and average number of paths per class (ANP), the tree impurity (TIP), relationship richness (RR) and class richness (CR), (3) ranking of the ontologies in the dataset through the aggregation of their complexity metrics using 5 Multi-attributes Decision Making (MADM) methods, namely, Weighted Sum Method (WSM), Weighted Product Method (WPM), Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), Weighted Linear Combination Ranking Technique (WLCRT) and Elimination and Choice Translating Reality (ELECTRE) and (4) validation of the framework through the summary of the results of the previous phases and analysis of their impact on the issues of selection and reuse of the biomedical ontologies in the dataset. The ranking results of the study constitute important guidelines for the selection and reuse of biomedical ontologies in the dataset. Although the proposed framework in this study has been applied in the biomedical domain, it could be applied in any other domain of Semantic Web to analyze the complexity of ontologies.
ZnS and CuxSy nanoparticles from dithiocarbamate ligands
(2017) Mnqiwu, Khumblani; Moloto, M. J.; Xaba, T.
Dithiocarbamate ligands and their complexes has been a subject of interest in various fields but they found much interest in medical applications as potential anti-microbial agents. The dithiocarbamate ligands were used to prepare complexes of copper and zinc. All the prepared ligands and complexes were characterized using techniques such as IR and 13CNMR spectroscopy and thermogravimetric analysis (complexes). The data obtained from the spectroscopies was consistent with the coordination of the ligand to the metal ion through the sulfur atoms of the dithiocarbamate or thioureide moiety. The thermal analysis of the prepared complexes gave a final residue of metal sulfide, thus indicating the potential of the prepared complexes as single molecular precursor for the synthesis of metal sulfide nanoparticles. The prepared complexes were then used to synthesize metal sulfide nanoparticles. The nanoparticles were successfully prepared by thermal decomposition of a single-source precursor (dithiocarbamate complexes) in a solution of hexadecylamine (HDA) or tri-n-octylphosphine oxide (TOPO). The investigated parameters were the capping molecule (HDA and TOPO), and capping molecule concentration (3 g and 6 g) to see their effect on the shape and size of the synthesized nanomaterials. The synthesized metal sulfide nanoparticles were characterized using techniques such as UV-vis spectroscopy, photoluminescence spectroscopy, X-ray diffraction analysis and transmission electron microscopy. The absorption study showed some interesting features in the prepared nanomaterials. The first was the red-shifted spectra of the ZnS nanoparticles which was attributed to the impurities and that assumption was further confirmed by the XRD analysis that showed a sulfur impurity and other amorphous peaks. The second was the localized surface plasmon resonances on the copper sulfide nanoparticles that suggested the formation of electron deficient copper sulfide stoichiometry that was further confirmed by XRD analysis that gave hexagonal phase copper sulfide covellite. The TEM images of the prepared nanoparticles showed that the concentration and the capping molecule has an effect on the size and shape of the synthesized nanoparticles. The increase in capping concentration gave a decrease in particle size in most of the prepared nanoparticles, while they were few exceptions. The capping molecule effect showed that most of the nanoparticles prepared from TOPO were spherical in shape and were well dispersed compared to the mixed morphological nanoparticles prepared from HDA. There were also exceptions of the well dispersed HDA-capped nanoparticles.
The use of social networking services to enhance the learning experience and academic performance of tertiary level learners
(Vaal University of Technology, 2017-01) Da Rocha, R. D.; Lombard, A.; Jordaan, A., Prof.
There are many learning paradigms in the academic field, many of which have been used since the advent of universities and other learning institutions. However, the advent and subsequent popularisation of the Internet in the early 1990's has led to the development of new learning paradigms. Simultaneously, students currently enrolled at higher education institutions (HEI) fall under the Generation Z cohort, otherwise known as Millennials. This generation has grown up with widespread usage of the internet, and research has shown that engagement with these students in an educational setting has slowed down. This study endeavoured to establish whether the use of Social Networking Services (SNSs) could aid to better engage student in the teaching and learning process, and if so, whether there would be a measurable improvement in the marks of students enrolled in a final year Information Technology (IT) module at a HEI. Facebook and YouTube were the SNSs chosen as the focus of the study. Data collection was achieved by means of mixed-methods methodology. Semi-structured interviews were held with lecturers to determine their perceptions regarding the use of Facebook from an educational perspective. thematic analysis was performed to identify prominent themes in the qualitative data. Statistical analysis was performed on the result of two groups of students that took the final year module over two semesters. An action research based case study was designed as intervention for students in the 2nd semester involving the use of SNSs. The marks of the two groups were compared and contrasted to determine whether an improvement in results had taken place. Students participating in the action research case study also completed a survey for the purpose of gauging their experiences in the use of SNSs for the action research interventions are also highlighted and discussed, and thematic analysis is performed. After analysis of the gathered data had taken place, it was clear that the majority of participants in the study found that SNSs could add value to the teaching and learning process and there was a small to moderate improvement in results. Guidelines for other institutions that would like to integrate SNSs into their teaching and learning processes are proposed and a model has been developed.
Analysis and application of semantic web mechanism for storing and querying ontologies
(Vaal University of Technology, 2017-02) Kwuimi, Raoul; Fonou-Dombeu, J. V., Dr.
Since the introduction of Semantic Web in the early 2000, storing and querying ontologies have been a subject of greater research. Thus, several types of storage media and mechanisms have been developed to increase storage and query speed and efficiency of ontologies in Semantic Web applications. Existing Semantic Web mechanisms for storing and querying ontologies are implemented on several storage media and support different languages. However, there is a shortage of studies that provide an empirical analysis and application of these ontology storage and query mechanisms in the Semantic Web domain. This study conducted an analysis and application of the Semantic Web mechanisms for storing and querying ontologies. A thorough literature review was carried out to identify relevant publications pertaining to existing Semantic Web mechanisms for storing and querying ontologies as well as the platforms and storage media for implementing these mechanisms. Thereafter, the Design research method was used consisting of a set of predefined steps, namely, awareness, suggestion, development, evaluation, and conclusion. The awareness stage identified the need for an architecture to test several ontology storage media and mechanisms. In the suggestion stage a framework was proposed to empirically analyse and evaluate existing ontology storage and query mechanisms. The required Semantic Web platforms were identified to implement the framework in the development stage. The evaluation stage used a set of metrics to evaluate the framework including: the loading times of ontologies, the disc space used to store the ontology repositories and the mean and variance of query response times. Further, the evaluation stage analysed and discussed the storage mechanisms implemented in Semantic Web platforms. Finally, the outcome of the performance of the framework is presented in the conclusion stage. The framework was practically tested with six ontologies of different formats and sizes on two popular Semantic Web platforms, namely, Sesame and Jena API and the ontology storage and query mechanisms were analysed and compared. Although the underlying structures of repositories in the in-memory and native files in Jena and Sesame could not be accessed, it was possible to access and analyse the data in the repositories in the relational database storage in both Sesame and Jena. The results showed that Sesame relational uses a combination of mechanisms such as normalized triples store in combination with vertical partitioning. That combination allows Sesame to store ontologies based on their contents; in other words, each ontology has a different database schema in Sesame. Jena on the other hand, uses only a normalized triple store mechanism, also known as generic schema mechanism to store ontologies; thus, all ontologies in Jena have the same database schema. The study would be useful to the Semantic Web and Computer Science communities as it does not only provide theoretical knowledge but also the empirical findings that may serve as a base for further development of ontology storage media and mechanisms.
Malware analysis and detection in enterprise systems
(Vaal University of Technology, 2017-03) Mokoena, Tebogo; Harmse, Anneke; Zuva, Tranos, Prof.
Malware is today one of the biggest security threats to the Internet. Malware is any malicious software with the intent to perform malevolent activities on a targeted system. Viruses, worms, trojans, backdoors and adware are but a few examples that fall under the umbrella of malware. The purpose of this research is to investigate techniques that are used in order to effectively perform Malware analysis and detection on enterprise systems to reduce the damage of malware attacks on the operation of organizations. Malware analysis experiments were carried out using the two techniques of malware analysis, which are Dynamic and Static analysis, on two different malware samples. Portable executable and Microsoft word document files were the two samples that were analysed in an isolated sandbox lab environment. Static analysis is the process of examining and extracting information from malware code without executing the malware, while Dynamic analysis is the process of executing malware in order to observe and record its behaviour in a controlled environment. The results from the experiments disclosed the behaviour, encryption techniques, and other techniques employed by the malware samples. These malware analysis experiments were carried out in an isolated lab environment that was built for the purpose of this research. The results showed that Dynamic analysis is more effective than Static analysis. The study proposes the use of both techniques for comprehensive malware analysis and detection.

Browse

Browsing Information Communication Technology by Issue Date

Results Per Page

Sort Options