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RISS 인기검색어
- 검색키워드
- 저자 : Rafidah Mazlan (검색결과 3 건)
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Hamzah A Wali,Rafidah Mazlan 대한청각학회 2018 Journal of Audiology & Otology Vol.22 No.1
Background and Objectives: Although ethnicity effect on wideband absorbance (WBA) findingswas evident for adults, its effect on neonates has not been established yet. This studyaimed to investigate the influence of ethnicity on WBA measured at 0 daPa from neonateswith healthy middle ear functions. Subjects and Methods: Participants were 99 normal,healthy, full-term newborn babies with chronological age between 11 and 128 hours of age(mean=46.73, standard deviation=26.36). A cross-sectional study design was used to measureWBA at 16 one-third octave frequency points from 99 neonates comprising of threeethnic groups: Malays (n=58), Chinese (n=13) and Indians (n=28). A total of 165 ears (83.3%)that passed a battery of tests involving distortion product otoacoustic emissions, 1 kHztympanometry and acoustic stapedial reflex were further tested using WBA. Moreover, bodysize measurements were recorded from each participant. Results: The Malays and Indiansneonates showed almost identical WBA response across the frequency range while the Chinesebabies showed lower absorbance values between 1.25 kHz and 5 kHz. However, thedifferences observed in WBA between the three ethnic groups were not statistically significant(p=0.23). Additionally, there were no statistically significant difference in birth weight,height and head circumference among the three ethnic groups. Conclusions: This studyshowed that Malays, Chinese and Indians neonates were not significantly different in their WBAresponses. In conclusion, to apply for the ethnic-specific norms is not warranted when testingneonates from population constitute of these three ethnicities.
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Siti Zamratol-Mai Sarah Mukari,Nor Haniza Abdul Wahat,Rafidah Mazlan 대한청각학회 2014 Journal of Audiology & Otology Vol.18 No.3
Background and Objectives: This study investigated the effect of ageing on speech perception in quiet and in noise, with noise directed from front, right and left. Subjects and Methods: Sixty Malay native adults with normal or near normal hearing comprising of 20 young adults (21 to 39 years old), 20 middle aged (40 to 59 years old) and 20 older adults (60 to 74 years old) participated in this study. Their speech perception ability was measured using the Malay Hearing in Noise Test (HINT) in four test conditions; 1) in quiet (HINT Q), 2) with noise from front (HINT NF), 3) with noise from right (HINT NR), and 4) with noise from left (HINT NL). Reception thresholds for sentences (RTSs) were measured in each of the aforementioned conditions using an adaptive method. Results: The results showed that, 1) genuine age-related decline was found in speech perception performance in HINT (NF), 2) hearing threshold was a major determinant differentiating speech perception performance for HINT (Q) and HINT (NL) conditions, and 3) speech perception performance for HINT (NR) was determined by both age and hearing threshold. Conclusions: This study suggests that, in older adults, while hearing thresholds affect speech perception in quiet, other factors such as central auditory processing and cognitive functions might be more important determinant factors for speech perception performance in noise.
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Muhammad Rizal Muhammad Asyraf,Mohamad Ridzwan Ishak,Mohd Nor Faiz Norrrahim,Abdul Latif Amir,Norizan Mohd Nurazzi,Rushdan Ahmad Ilyas,Mochamad Asrofi,Mazlan Rafidah,Muhammad Rizal Razman 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
Man-made composites are vastly implemented in various engineering applications, particularly in cross-arm component of latticed transmission tower. However, their practice in this sector has increased pollutant emissions and landfill areas. Thus, scientists and engineers have been driven to look for other ‘greener’ alternative materials that have low-cost and renewable sources. Flax fibers and poly(lactic) acid (PLA) biopolymer have been extensively used to develop vast green composite structural products because of their great mechanical behaviours. A comprehensive understanding of properties of composite materials is essential to evaluate their applicability, especially in structural applications. This manuscript discusses the physic-mechanical properties and processing and manufacturability of flax fiber, PLA biopolymer and their composites. This review also comprehensively discovers the potential of fabric flax fiber-reinforced PLA composites for cross-arm application. The chemical composition, extraction, treatment and fabrications of these fiber and biopolymer are elaborated deeply given that these aspects are essential for the development of green composite cross-arm.
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