Muhammad Hafiz Ummah Abu Bakar Bakri
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Muhammad Hafiz Ummah Abu Bakar Bakri
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Muhammad Hafiz Ummah, Abu Bakar Bakri
Alternative Name
Bakri, Muhammad Hafiz Ummah Abu Bakar
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  • Publication
    A comparative finite element analysis of regular and topologically optimised dental implants for mechanical and fatigue responses evaluation
    (Faculty of Engineering. International Islamic University Malaysia, 2023)
    Muhammad Ikman Ishak
    ;
    Siti Noor Fazliah Mohd Noor
    ;
    Ruslizam Daud
    ;
    Muhammad Hafiz Ummah Abu Bakar Bakri
    Topology optimisation is a prominent method to improve the performance of any systems by optimising geometrical factors to save materials without compromising the system functionality. Currently, there is limited published data discussing the topologically optimised dental implants that makes the matter still unclear. This study aimed to evaluate the mechanical and fatigue behaviours of regular and topologically optimised dental implant designs using 3-D FEA. Geometrical models were developed in accordance with ISO 14801 using SolidWorks 2020 before being analysed in ANSYS 18.1. The new implant design was created by topology optimisation analysis. The material properties of all parts were assumed to be isotropic, linearly elastic, and homogenous. Nine different compressive load values ranging from 100 to 500 N were applied on the loading structure as separated cases. The vertical and bottom surfaces of the holder were fully constrained. The results showed that the topologically optimised implant recorded about 12.3% lower implant stress than the regular implant. Both implant designs revealed a comparable displacement result with a percentage difference of only 2.3%. The optimised design was also found to produce longer fatigue life and approximately 12.3% higher safety factor compared to the regular design. The increase in the compressive load value has increased the stress and deformation, whilst decreased the fatigue life and safety factor in both designs. Although it was estimated that the volume of the new implant could be reduced to about 24% of the traditional one, the implant functionality may still be retained or even be improved.
  • Publication
    Language vitality of Kensiu: issues of intergenerational language transmission, language use, and language attitude
    (Penerbit UKM, 2024-05)
    Mohd Hilmi Hamzah
    ;
    Muhammad Hafiz Ummah Abu Bakar Bakri
    ;
    Hasliza Abdul Halim
    The present study reports the language vitality of Kensiu, an endangered Austroasitic language spoken by less than 300 individuals in Kampung Orang Asli Lubuk Legong in the northern state of Kedah, Malaysia. Following UNESCO’s language vitality assessment, this study aims to explore three critical issues related to language vitality: (1) intergenerational language transmissions; (2) language use; and (3) language attitude. Data were collected at the Kensiu settlement through semi-structured interviews involving two male native speakers representing younger and older generations of Kensiu. The data were analysed qualitatively using ATLAS-Ti version 8 and were interpreted via assessment tools such as UNESCO’s language vitality assessment and the Extended Graded Intergenerational Disruption Scale (EGIDS). The results reveal some evidence of intergenerational language transmission within the Kensiu community. The language appears to be used in limited domains, such as ‘family’ and ‘friendship’, with the High variety (Malay) being given more emphasis over the Low variety (Kensiu), though there is a balanced relationship between diglossia and bilingualism. The gap in Sustainable Literacy is also apparent in the literary resources related to the Kensiu language. With regard to language attitude, there are some contrasting perspectives between older and younger generations, though both participants generally agree about the identity of Kensiu speakers and the way they accommodate other dominant languages in their daily life. The findings shed some light on the concepts of intergenerational transmission, language use, and language attitude on the Kensiu language and provide an avenue for further investigations involving endangered indigenous languages in Malaysia.