Displaying all 11 publications

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  1. Ab Ghani, A. F., Razali, M. A. A., Zainal, Z., Idral, F.
    MyJurnal
    This paper aims to present a method of detecting deterioration on rotating machinery in the
    form of Machinery Fault Simulator (MFS) performed in the lab. The study enhances the knowledge of
    signal pattern of misalignment phenomenon as compared to baseline signal pattern obtained from
    normal condition of rotating shaft. The focus of this experiment was on misalignment problem. There
    are two types of misalignment which are parallel and angular misalignment. Input in frequency was
    selected for motor movement and the shaft start to rotate. The vibration signal from the shaft was
    acquired using in built tachometer in the MFS. In this experiment, data shows that the vibration occurs
    in different shape of the amplitude at different speed of the angular motion. In baseline test, the
    amplitude values are fluctuated at every accelerometer channels. Meanwhile, the amplitude on the
    angular test shows that the amplitude is higher at axial axes only compared to both axes. Meanwhile,
    for the second test, the angle of 15o
    was applied at inboard in the system caused to the misalignment of
    the shaft. In vibration analysis, the misalignment of the shaft was detected from the changes of the
    amplitude at three different axes. Copyright © 2016 Penerbit Akademia Baru - All rights reserved.
  2. Bong CH, Lau TL, Ab Ghani A
    Water Sci Technol, 2013;68(11):2397-406.
    PMID: 24334888 DOI: 10.2166/wst.2013.498
    This paper highlights a preliminary study on the potential of a tipping flush gate to be used in an open storm drain to remove sediment. The investigation was carried out by using a plasboard model of the tipping flush gate installed in a rectangular flume. A steady flow experiment was carried out to determine the discharge coefficients and also the outflow relationship of the tipping flush gate. The velocity produced by the gate at various distances downstream of the gate during flushing operation was measured using a flowmeter and the velocity at all the points was higher than the recommended self-cleansing design available in the literature. A preliminary experiment on the efficiency of flushing was conducted using uniform sediment with d50 sizes of 0.81, 1.53 and 4.78 mm. Results generally showed that the number of flushes required to totally remove the sediment from the initial position by a distance of 1 m increased by an average of 1.50 times as the sediment deposit bed thickness doubled. An equation relating the number of flushes required to totally remove the sediment bed for 1 m with the sediment bed deposit thickness was also developed for the current study.
  3. Loh EYX, Ab Ghani A, Ahmad R
    Adv Exp Med Biol, 2023;1430:181-195.
    PMID: 37526848 DOI: 10.1007/978-3-031-34567-8_10
    The National Pharmaceutical Regulatory Agency (NPRA) is the agency responsible for the registration of pharmaceutical, natural, and health supplement products and notification of cosmetic products that are marketed in Malaysia. The implementation of regulatory oversight of the different types of product was in a progressive manner, with the latest addition to be regulated being the cell and gene therapy products (CGTPs), beginning January 1, 2021. CGTP can be classified as low risk (that does not require registration) or high risk (that needs to be registered). Generally, the regulation of high-risk CGTP is similar to other biological products. This chapter describes the chronology of the CGTP framework, classification of CGTP, how CGTPs fit into the current registration pathways and registration procedure, dossier requirements, and what is the current status and future direction of CGTP in Malaysia.
  4. Bong CH, Lau TL, Ab Ghani A, Chan NW
    Water Sci Technol, 2016 Oct;74(8):1876-1884.
    PMID: 27789888
    The understanding of how the sediment deposit thickness influences the incipient motion characteristic is still lacking in the literature. Hence, the current study aims to determine the effect of sediment deposition thickness on the critical velocity for incipient motion. An incipient motion experiment was conducted in a rigid boundary rectangular flume of 0.6 m width with varying sediment deposition thickness. Findings from the experiment revealed that the densimetric Froude number has a logarithmic relationship with both the thickness ratios ts/d and ts/y0 (ts: sediment deposit thickness; d: grain size; y0: normal flow depth). Multiple linear regression analysis was performed using the data from the current study to develop a new critical velocity equation by incorporating thickness ratios into the equation. The new equation can be used to predict critical velocity for incipient motion for both loose and rigid boundary conditions. The new critical velocity equation is an attempt toward unifying the equations for both rigid and loose boundary conditions.
  5. Harun MA, Safari MJS, Gul E, Ab Ghani A
    Environ Sci Pollut Res Int, 2021 Oct;28(38):53097-53115.
    PMID: 34023993 DOI: 10.1007/s11356-021-14479-0
    The investigation of sediment transport in tropical rivers is essential for planning effective integrated river basin management to predict the changes in rivers. The characteristics of rivers and sediment in the tropical region are different compared to those of the rivers in Europe and the USA, where the median sediment size tends to be much more refined. The origins of the rivers are mainly tropical forests. Due to the complexity of determining sediment transport, many sediment transport equations were recommended in the literature. However, the accuracy of the prediction results remains low, particularly for the tropical rivers. The majority of the existing equations were developed using multiple non-linear regression (MNLR). Machine learning has recently been the method of choice to increase model prediction accuracy in complex hydrological problems. Compared to the conventional MNLR method, machine learning algorithms have advanced and can produce a useful prediction model. In this research, three machine learning models, namely evolutionary polynomial regression (EPR), multi-gene genetic programming (MGGP) and M5 tree model (M5P), were implemented to model sediment transport for rivers in Malaysia. The formulated variables for the prediction model were originated from the revised equations reported in the relevant literature for Malaysian rivers. Among the three machine learning models, in terms of different statistical measurement criteria, EPR gives the best prediction model, followed by MGGP and M5P. Machine learning is excellent at improving the prediction distribution of high data values but lacks accuracy compared to observations of lower data values. These results indicate that further study needs to be done to improve the machine learning model's accuracy to predict sediment transport.
  6. Mohammadpour R, Shaharuddin S, Chang CK, Zakaria NA, Ab Ghani A
    Water Sci Technol, 2014 10 18;70(7):1161-7.
    PMID: 25325539 DOI: 10.2166/wst.2014.343
    Free-surface constructed wetlands are known as a low-energy green technique to highly decrease a wide range of pollutants in wastewater and stormwater before discharge into natural water. In this study, two spatial analyses, principal factor analysis and hierarchical cluster analysis (HACA), were employed to interpret the effect of wetland on the water quality variables (WQVs) and to classify the wetland into groups with similar characteristics. Eleven WQVs were collected at the 17 sampling stations twice a month for 13 months. All sampling stations were classified by HACA into three clusters, with high, moderate, and low pollution areas. To improve the water quality, the performance of Cluster-III (micropool) is more significant than Cluster-I and Cluster-II. Implications of this study include potential savings of time and cost for long-term data monitoring purposes in the free-constructed wetland.
  7. Khoo YSK, Tang TY, Goh PS, Halimi HM, Ab Ghani A
    Ther Innov Regul Sci, 2017 Jan;51(1):55-59.
    PMID: 30236002 DOI: 10.1177/2168479016664774
    BACKGROUND: Because of its structure and complex manufacturing process, every biotherapeutic product (BTP; medicinal products made by or derived from living organisms and produced by biotechnology) adheres to stringent quality assurance and control requirements, in addition to extensive nonclinical and clinical study data. Similarly, copy products of original biotherapeutics (termed as "biosimilars") are subjected to equally strict regulatory control. BTPs have been registered in Malaysia since the 1990s; however, registration of biosimilars started only in 2008.

    METHODS: This research aims to compare evaluation practice on biosimilar and novel BTPs at the Biological Product Registration Section in Malaysia. Evaluation activities were studied in terms of evaluation questions, evaluation timeline, nonclinical and clinical requirements, and local requirements on product label (including package insert). Six biosimilar product dossiers and 6 novel BTP dossiers evaluated in 2013-2015 were sampled. Parameters for comparison were determined and analyzed using data collection forms. Specific to the biosimilar products, the evaluation practice on labels and package inserts were dissected and described in a qualitative arm of this research.

    RESULTS: Generally, the registration requirements of novel BTPs and biosimilar products are in agreement with international regulatory practices. However, some labeling and package insert requirements, and registration conditions are unique to the Malaysian regulatory context.

    CONCLUSIONS: Study findings revealed some similarities and differences in current evaluation practice (timeline and requirements) for biosimilar versus novel BTPs. The findings of this research also provide an insight on current evaluation practice on biosimilar product labeling.

  8. Loh EYX, Goh PS, Mannan AMM, Mohd Sani N, Ab Ghani A
    Cytotherapy, 2021 12;23(12):1108-1113.
    PMID: 34362651 DOI: 10.1016/j.jcyt.2021.06.006
    BACKGROUND AIMS: Cell and gene therapy products (CGTPs) are anticipated to bring many benefits for the treatment of conditions with limited or no satisfactory treatment options. However, they are associated with concerns of potential safety risks because of their high complexity. The National Pharmaceutical Regulatory Agency (NPRA) of Malaysia took the first step toward the regulation of CGTPs by publishing the Malaysian Guidance Document and Guidelines for CGTPs in 2016. As mandatory registration and enforcement of CGTPs were scheduled to begin January 1, 2021, the aim of this study was to ascertain the industry's readiness for the regulation of CGTPs in terms of awareness of the guidelines, challenges and acceptance of the regulatory requirements.

    METHODS: The authors invited 48 CGTP companies to participate in the survey between October 2019 and June 2020, and 30 companies responded.

    RESULTS: The majority of respondents were aware of the mandatory CGTP regulatory control and the availability of the guidelines. Many CGTPs were in the early development phase, and the most difficult registration barriers were dossier preparation and compliance with the pre-clinical and clinical requirements.

    CONCLUSIONS: These findings represent the current CGTP landscape in Malaysia from the industry's viewpoint, enabling the NPRA to implement initiatives to facilitate registration and enforcement.

  9. Cheah WH, Mat Jusoh N, Aung MMT, Ab Ghani A, Mohd Amin Rebuan H
    Indian J Radiol Imaging, 2023 Jan;33(1):36-45.
    PMID: 36855734 DOI: 10.1055/s-0042-1758198
    Background  Magnetic resonance imaging (MRI) safety screening is a crucial procedure for patient preparation before entering into MRI room. Many hospitals in Malaysia are still using the MRI safety checklist printed form. Besides, clinicians will not get a definite conclusion about whether the patient is contraindicated for MRI or not. Hence, we have created one mobile application named MagnetoSafe to overcome this issue. The application will provide an instant decision on whether the patient has no contraindication, relative contraindication, or absolute contraindicated for MRI. We need to check for acceptability and user experience for any newly created mobile application. Objective  This study was designed to check the validity of the adapted Technology Acceptance Model (TAM) and System Usability Scale (SUS) Questionnaire. Method  The validity and reliability of the questionnaire were investigated. Subsequently, 52 fully completed responses were collected. Results  Face and content validity of the questionnaires are considered acceptable with only minor changes to Item 10 of SUS. The Cronbach's alpha for the SUS questionnaire (10 questions) is -0.49, which is not acceptable. The Cronbach's alpha for TAM questionnaire (3 domains; 14 questions) is acceptable, which is 0.910 for perceived usefulness, 0.843 for perceived ease of use, and 0.915 for intention to use. Conclusion  Face validity of the adapted SUS and modified TAM questionnaires is acceptable with only minor changes to Item 10 in SUS. Content validity with experts is good. However, the reliability of the SUS questionnaire is not acceptable and therefore adapted SUS will not be used for assessing user experience. The reliability of the modified TAM questionnaire with the original three-factor structure is considered acceptable and can be used to evaluate the user's acceptability of MagnetoSafe.
  10. Mohammadpour R, Shaharuddin S, Chang CK, Zakaria NA, Ab Ghani A, Chan NW
    Environ Sci Pollut Res Int, 2015 Apr;22(8):6208-19.
    PMID: 25408070 DOI: 10.1007/s11356-014-3806-7
    Poor water quality is a serious problem in the world which threatens human health, ecosystems, and plant/animal life. Prediction of surface water quality is a main concern in water resource and environmental systems. In this research, the support vector machine and two methods of artificial neural networks (ANNs), namely feed forward back propagation (FFBP) and radial basis function (RBF), were used to predict the water quality index (WQI) in a free constructed wetland. Seventeen points of the wetland were monitored twice a month over a period of 14 months, and an extensive dataset was collected for 11 water quality variables. A detailed comparison of the overall performance showed that prediction of the support vector machine (SVM) model with coefficient of correlation (R(2)) = 0.9984 and mean absolute error (MAE) = 0.0052 was either better or comparable with neural networks. This research highlights that the SVM and FFBP can be successfully employed for the prediction of water quality in a free surface constructed wetland environment. These methods simplify the calculation of the WQI and reduce substantial efforts and time by optimizing the computations.
  11. Ab Ghani A, Nayan SA, Kandasamy R, Rosman AK, Ghani AR
    Malays J Med Sci, 2016 Nov;23(6):113-117.
    PMID: 28090185 MyJurnal DOI: 10.21315/mjms2016.23.6.12
    The annual incidence of intracranial aneurysm in Malaysia is estimated to be 1.1-1.7 per 100,000 population based on a study done conducted in 1988. Since then, little epidemiological research has been conducted in Malaysia, and the real incidence is therefore probably unreported despite advancements in the diagnosis and treatment of this disorder. Intracranial aneurysm may be treated by microsurgical clipping or embolisation depending on its location and the surgeon's preference. This study aims to report the characteristics and outcomes of patients with a clipped anterior circulation aneurysm in Hospital Sungai Buloh.
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