COGS Thesis and Dissertations

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COGS Thesis and Dissertations

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Browsing COGS Thesis and Dissertations by Title

Now showing 1 - 20 of 342
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    A design framework for designing a virtual environment for stress therapy : Malaysian context
    (2025-03-05)
    Farhah Amaliya Zaharuddin
    The application of virtual reality in the field of psychology has been found to help its users improve their mental health conditions. Recently, the application of virtual reality has been expanded as an alternative tool for psychological stress therapies. Most of the available literature on virtual reality for stress therapy focuses on evaluating the system's effectiveness, with less discussion available on the design of virtual environments that facilitate stress reduction. Based on the review conducted, it was recommended to identify unique requirements that foster the therapeutic characteristics of a therapy condition when designing technological applications for human psychology and cognitive behaviour. The recommendation highlights the importance of identifying unique requirements for the purpose of designing effective virtual environments intended for stress therapy. Presently, the identification of the unique requirements remains outstanding, as the frameworks and guidelines available were discussed separately from two different perspectives: human psychology and information technology. Therefore, to address the gap, this study has proposed a framework for designing a virtual environment for stress therapy. The framework listed the design elements from both the perspectives of human psychology and information technology. The framework was developed and validated iteratively through a series of five studies: two on requirements and three on evaluation. These studies received participation from users and experts within the relevant domains. The data collection process encompassed five methods, including (i) a questionnaire, (ii) an interview, (iii) a presentation, (iv) a prototype demonstration, and (v) an experiment. Subsequently, the collected data were analysed through five methods of analysis, namely: (i) thematic analysis; (ii) content analysis; (iii) cross-case analysis; (iv) descriptive statistics; and (v) inferential statistics. The result of the study was a final framework for designing virtual environments for stress therapy, encompassing five factors and 14 design elements. Through the analysis conducted, the effectiveness and usefulness of the proposed design principles were evident in their capacity to mitigate stress when integrated into virtual environments. As such, the proposed framework exhibits potential as a guideline for designing an effective virtual environment specifically intended for stress therapy. In addition, the framework also represents a significant contribution to the current evolving field of advanced technology for human well-being, which holds the potential to benefit human health
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    A framework for sustaining users participation in non-profit mobile crowdsourcing applications
    (2020-10)
    Farahidayah Mahmud
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    Nowadays, mobile devices have increasingly becoming a necessity in people’s daily life. It has significantly changed the way people communicate and perform their day-to-day activities. In line with this scenario, there is also a practice that is gaining more and more attention from mobile devices’ users called crowdsourcing. Amongst the benefits of crowdsourcing is that it can reduce companies’ production cost due to the reduced manpower. However, these can only be attained if sufficient number of contributions is received from the crowd, i.e., sufficient users participation. Due to its nature that relies heavily on users contributions, users participation is one of the main factors that determine the success of an MCA. Two types of crowdsourcing exist; profit and non-profit. The decision to focus on the users participation in non-profit MCA in this research is because sustaining users participation is more challenging and more critical in non-profit crowdsourcing where financial rewards are not usually offered to and not expected by the participants. Although a number of studies related to the factors that influence users participation was found, none of these studies so far leads towards the formation of a framework that can serve as a guide for the developer to consider the factors in developing the MCAs. Therefore, the aim of this research is to develop a framework that can be used by the developers by extending the research on influencing factors. To do this, literature review and semi-structured interviews with the MCA users were performed. Results were analysed and coded using constant comparison method. Six influencing factors from the literature review and five influencing factors from the interview were found. Factors from both methods were merged to come out with six influencing factors which are; useful information provided, financial impact, reward offered, interaction with others, features of application and self-advancement. Corresponding components were identified to specifically address the influencing factors. The components were bound together to enable them to inter-relate with one another and become the framework. The framework was evaluated using two methods which are expert evaluation and benchmarking with successful non-profit MCAs. Expert evaluation was chosen to assess the suitability of the elements that constitute the framework from the perspective of the software developers who are exposed to crowdsourcing application. Statistical evaluation was performed to identify the reliability of the instrument (questionnaire). Cronbach’s Alpha was used to do this evaluation. With the score of 0.978, the reliability of the instrument used can be concluded as reliable. Benchmarking of successful non-profit MCAs evaluation is an evaluation that used existing successful non-profit MCAs to validate the components that constitute the constructed framework. Two non-profit MCAs which are OpenSignal and Be My Eyes were found as successful non-profit MCAs that fulfill the requirements as successful non-profit MCAs. These two MCAs then were used to identify the extent to which these two MCAs agreed with the components in the framework. Results show ten over eleven for OpenSignal and eight over eleven for Be My Eyes have the components in the framework which conclude that these two MCAs have the majority of the components. It indicates that this framework is relevant and can be used to develop non-profit MCAs that can sustain users participation. As a conclusion, the framework for sustaining users participation in non-profit MCAs is found to be useful as a guideline for the developer to develop an MCA that can sustain users participation.
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    A hybrid ANN-SVM approach for Malay word cheque recognition system
    (2011-01)
    Omar Noori Salih al Boredi
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    AC interference effect of high voltage overhead transmission lines to nearby high voltage underground cables
    (2022-02)
    Zoolnasri Bin Abu Harun, Mr.
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    Issues and interests of AC interference from Overhead Transmission Lines (OTL) to nearby objects or facilities has been studied by many researchers. It was found that the operation of OTL either during state or fault conditions has imposed a threat to nearby objects in its vicinity, especially those running in OTL Right of Way (ROW). This threat translates typically into an induced voltage or circulating current experienced by nearby objects due to electromagnetic interference from OTL energization. The common facilities usually within the OTL's ROW are gas pipelines, water pipelines, communication towers, and railways system, especially in populated congested areas. These interferences not only concern those mentioned facilities but also to another type of transmission system such as High Voltage (HV) underground cables that might share ROW with OTL. Due to limited land space and expensiveness of land acquisition to build new transmission networks, OTL ROW is utilized by having underground cables laid within the ROW. Nevertheless, the underground cable will also experience AC interferences from the OTL and study shall be conducted to assess the level of interferences before putting both systems in place. In this study, the objectives are to model, assess and analyze the effect of OTL to HV underground cables buried within OTL ROW by using Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis (CDEGS) software program. To evaluate the induced voltage, both systems are placed in vicinities where it comprises case studies of 132 kV, 275 kV and 500 kV OTL and 132 kV and 275 kV AC three-phase underground cables. The case studies cover different arrangements of both systems, such as length of parallelism, different energization values, crossing angle and varying soil resistivity. Modeling, simulation and analysis of interferences are presented to assess the induced voltage on the sheath of underground cables together with a proposed mitigation technique. This study investigates when OTL operates in steady state and fault conditions while the HV underground cable operates in normal conditions. The results show that the induced voltage on certain case studies increases above sheath standing voltage of 65 V. However, the induced voltage on cable sheath is reduced to tolerable sheath standing voltage by implementing mitigation techniques using underslung earth wires (underbuilt below phase conductors of OTL) and Ground Continuity Conductor (GCC) placed within underground cables. It is found that AC interference from OTL affect the induced voltage on cable sheath which can influence the performance of the underground cables. It is essential for engineers to simulate, assess and propose mitigation techniques to limit the sheath standing voltage of underground cable sharing ROW with OTL.
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    Acceptance of M-learning among students in UNITEN
    (2014-01)
    Firas Zaki Hadi
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    Acoustic performance of fibreboard composed of different composition of Empty Fruit Bunch (EFB) and Oil Palm Frond (OPF)
    (2020-05)
    Mageswaran Ravi Chandran
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    The demand for sound-absorbing material is increasing day by day. Since the awareness of the health issues on humans and animals, synthetic fibre market as sound absorbing material has gone down. The demand for natural fibre to replace synthetic material as sound-absorbing material is skyrocketing. As a known fact, natural fibre is more eco-friendly, biodegradable and most importantly is it does not pose a threat to human health. This particular research explored the acoustic properties of Empty Fruit Bunch (EFB) and Oil Palm Frond (OPF) natural fibre at different mixing ratio of (50% EFB – 50% OPF, 40% EFB – 60% OPF, 30% EFB – 70% OPF and 20% EFB – 80% OPF) in thickness of 12 mm, 14 mm, 16 mm and 18 mm. The experiment was conducted using the Impedance Tube Method (ITM) where all the sixteen EFB and OPF fibreboard were tested for Sound Absorption Coefficient, SAC (α) and Scanning Electron Microscope, SEM. From the results obtained, it shows that all the samples have very excellent acoustic property. Above 3500 Hz, all samples possessed a SAC value of more than 0.70 and above. All the samples exhibited a range of SAC values of 0.97 – 1.00 (unity) at a high-frequency range of 5000 Hz to 6400 Hz. The SAC values are found to increase as the thickness increases for all the mixture percentages. As compared to Mesocarp, Kenaf and other wood fibres, the mixture of EFB and OPF natural fibres have a more promising sound absorption rate. For SEM micrograph results, it can be clearly seen and identified the microstructure content of EFB and OPF mixture that aided in enhancing the acoustic properties of the material. The morphology content that can enhance the acoustic properties is Lignin and Hemicellulose. Lignin may affect the absorption rate where Hemicellulose may enhance the acoustic properties. The best combination of EFB and OPF natural fibre are (40% - 60%), where the diameter of the fibres OPF are smaller than EFB fibres
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    Agent-based monitoring of virtual machines
    (2010-10)
    Anas Ayad AbdulRazzaq
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