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  1. Deros, B.M., Daruis, D.D.I., Rozia, H.M.N.
    MyJurnal
    The main objective of the study is to determine the noise level emitted by the machinery and equipment used at a Liquefied Petroleum Gas in Melaka, Malaysia. The study also aims to determine the exposure level of noise to the employees. The machinery and equipment noise level was measured using a calibrated sound level meter. Noise level of each source was measured by pointing the sound level meter microphone at normal working distance to the source. Personal noise exposure was conducted at the shoulder of the personnel and as close as possible to the personnel’s ear. From a total of 154 noise sources points identified at three work areas surveyed, 122 points were above Action Level of 85 dBA of which 57 points had exceeded the Permissible Exposure Limit of 90 dBA. For the personal exposure monitoring, ten out of fourteen had exceeded the Action Level of 85 dBA for those working for 8 hours and 82 dBA for those working for twelve hours and one of them had exceeded the Permissible Exposure Limit of 87 dBA for those working for twelve hours. The monitored personnel have exceeded the Maximum Level and the Peak Level limit of 115 dBA and 140 dB respectively. From the study, it is concluded that further noise monitoring is needed especially when there are changes to the work process and equipment used. Also the requirement to notify the selected workers on the personal noise exposure result, actions to reduce noise level at the workplace through engineering control methods and administrative controls.
  2. Yusoff, A.R., Deros, B.M., Daruis, D.D.I., Joseph, H.L.
    MyJurnal
    Proper driving requires a proper posture to bring comfort to drivers. A problem that commonly exists in driving is incorrect driving posture which can cause discomfort to the driver, especially when interacting with automotive pedals. Research on contraction of tibialis anterior (TA) muscle on driver's posture based on the knee angle less than 101º in a position of pressing and releasing a pedal was conducted to investigate and overcome this problem. This is a field experiment study and surface electromyography (sEMG) is used in collecting data on the TA muscle. The procedure of collecting data on the TA muscle before and after experiments follows the Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles (SENIAM) recommendations. The result of the experiment shows that there is a strong negative relationship between driver's postures in nature based on the angle of the knee with TA muscle contractions, where the Pearson correlation coefficient (r) is - .993. While the temporal analysis measurements based on Maximum Voluntary Isometric Contraction (MVIC) 60% in a position of releasing a pedal exceeding rms μV 39.38, are 39.71 and 40.25 respectively. On the other hand, MVIC 2% rms μV values: 1.19 and 1.2 are obtained in the position of pressing the pedal. The knee angle with TA muscle contractions is significant [F (1, 10) = 660, p
  3. Yusoff, A.R., Deros, B.M., Daruis, D.D.I., Joseph, H.L.
    MyJurnal
    Safe driving requires an ideal posture to bring comfort to drivers. A problem that commonly exists in driving is nonideal
    driving posture, which can cause discomfort to the driver, especially when interacting with automotive pedals.
    Research on contraction of Soleus muscle on driver's posture based on the knee angle more than 144º in a position of
    pressing and releasing a pedal was conducted to investigate and overcome this problem. This is a field experimental
    study and surface electromyography (sEMG) is used in collecting data on the Soleus muscle. The procedure of
    collecting data on the Soleus muscle before and after experiments follows the Surface Electromyography for the
    Non-Invasive Assessment of Muscles (SENIAM) recommendations. The result from the experiment shows that there is
    a strong positive relationship between driver's postures in nature based upon the angle at the knee with Soleus
    muscle contraction, where the Pearson correlation coefficient (r) is .990. While the temporal analysis measurements
    based on Maximum Voluntary Isometric Contraction (MVIC) 60% in a position of pressing a pedal exceeding rms µV
    25.34, and 25.47 respectively. On the other hand, MVIC 3% rms µV values: 1.18, 1.21 and 1.26 are obtained from the
    position of releasing the pedal. The knee angle with Soleus muscle contractions is significant [F (1, 10) = 38.06,
    p
  4. Yusoff, A.R., Deros, B.M., Joseph, H.L., Daruis, D.D.I., Ismail, A.R.
    MyJurnal
    Proper driving requires a proper posture to bring comfort to drivers. A problem that commonly exists in driving is
    incorrect driving posture which can cause discomfort to the driver, especially when interacting with automotive
    pedals. Research on fatigue of Soleus muscle on driver's posture based on the knee angle more than 144º in a
    position of pressing and releasing a pedal was conducted to investigate and overcome this problem. This is a field
    experiment study and surface electromyography (sEMG) is used in collecting data on the Soleus muscle. The
    procedure of collecting data on the Soleus muscle before and after experiments follows the Surface
    Electromyography for the Non-Invasive Assessment of Muscles (SENIAM) recommendation. The result of the
    experiments shows that there is a strong positive relationship between driver's postures in nature based on the angle
    of the knee with Soleus muscle contraction, where the Pearson correlation coefficient (r) is .890. While the muscle
    fatigue index based on value MDF (MNF) in position of pressing a pedal. The results show that the Soleus muscle
    fatigue occurs when the foot pressing a pedal on MVC-normalized 60%. This is because the value of MDF (MNF) there
    is displacement of decrease of frequency MDF (MNF), from 130.21 Hz (313.42 Hz) to 127.60 Hz (312.49 Hz). The
    increase in the knee angle will directly provide discomfort to the driver while interacting with the pedal; and this is
    due to Soleus muscle fatigue.
  5. Deros, B.M., Daruis, D.D.I., Ghani, J.A., Saleh, C., Wazir, R.M., Yasim, M.K., et al.
    MyJurnal
    This An Ergonomic hazard often exists in any industry. However, majority of the employees are not aware of practicing good body posture until the MSDs symptoms become permanent and chronic. The main objective of this study is to determine the manual handling problems among workers at an electronic component manufacturing company. The scope of this study focused on the study entire body disorders among workers on electronic manufacturing company using the Rapid Entire Body Assessment (REBA). A cross sectional study involving observation of the workplace, the work task and the working environment, photographs and videos taken during the observation. Later, a survey questionnaire was given to the respondents to obtain their socio-demography information, work activity and health problems. Rapid Entire Body Assessment (REBA) was conducted on all respondents to determined REBA scores in different work positions. The study was conducted at an electronic component manufacturing company located in Klang Valley, Selangor. A total of 124 workers were surveyed and REBA assessment was performed on 20 workers at Company X production area. It includes 5 categories of position at Company X, such as:loading steel bar into casing; pushing the steel bar, turning movement while adjusting the steel bar, adjusting steel bar into the loading area, unloading steel bar from casing into the machine. The study found that turning section has the highest MSDs problems regarding manual handling because majority of the respondents in the turning department felt the pain while performing their work. This is due to their job demand, which they need to handle with tools weighing from 200 to 400 kg. The REBA scores showed that17 out of 20 respondents performing turning operations, moving and pushing the steel bar recorded the highest score of 11 or more which are categorize in the very high risk group. The position of pushing and turning steel bar while moving the steel bar has higher risk that contributed to the ergonomics risk factor, which in-turn can contribute to Muscular Skeletal Disorders (MSDs). More detailed investigation and remedial measures should be taken immediately, especially for the workers performing the manual handlings activities.
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