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    Wyświetlanie 1-4 z 4
    Tytuł:
    A Study on the Effects of Human Age, Type of Computer and Noise on Operators’ Performance of a Data Entry Task
    Autorzy:
    Khan, Z. A.
    Rizvi, S. A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/91125.pdf
    Data publikacji:
    2010
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    equivalent noise level
    age
    visual display units
    data entry task performance
    Opis:
    The effects of human age, type of computer, and noise on computer operators’ performance of a data entry task were investigated. Twenty male subjects aged 10–55 were assigned into 4 age groups each consisting of 5 persons. They performed the task for 15 min on desktop and laptop computers in a sitting posture under varying levels of noise. The mean number of characters entered per minute (MNCEPM) was statistically analyzed. Operators in the 16–25 age group achieved the highest rate of data entry at each level of noise investigated. Operators performed better on desktop than on laptop computers. Their performance decreased when noise level increased from 82 to 92 dB(A), but it improved at 102 dB(A). The effects of age and noise were statistically significant. However, the effects of the type of computer, the interactions between age and type of computer, age and noise level, and type of computer and noise were not found to be statistically significant.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 455-463
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Effect of Human Laterality, Type of Computer and Noise on Operators’ Performance of a Data Entry Task
    Autorzy:
    Khan, Z. A.
    Rizvi, S. A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/90760.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    equivalent noise level
    motor-sidedness
    visual display units
    data entry task performance
    Opis:
    Effects of human laterality, type of computer and noise on computer operators’ performance of a data entry task were investigated. Seven right- and 7 left-motorsided male subjects performed the task on desktop and laptop computers in a sitting posture under varying noise levels. The mean number of characters entered per minute was statistically analysed. The right-motorsided operators entered more data than left-motorsided ones at each noise level. Operators performed better on desktop computers. Operators’ performance decreased when noise level increased from 82 to 92 dB(A) but it improved at 102 dB(A). Effects of laterality, type of computer and noise, and the interaction between laterality and noise were statistically significant. The interactions between laterality and type of computer, and type of computer and noise were statistically insignificant. Laterality was statistically significant at all noise levels and noise was statistically significant for right motor-sided operators only.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2009, 15, 1; 53-60
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Musician’s Earplugs on Sound Level and Spectrum During Musical Performances
    Autorzy:
    Kozłowski, E.
    Żera, J.
    Młyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/90990.pdf
    Data publikacji:
    2011
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    earplugs
    hearing protection
    noise
    sound pressure level
    musicians
    Opis:
    In this study, change in A-weighted and 1/3-octave sound pressure levels (SPLs) was used to assess the influence of wearing earplugs by musicians on their musical performances. Seven soloists and 3 music assembles performed 4 pieces of music with musician’s earplugs donned and doffed. They used silicon custom moulded earplugs with acoustic filters designed to attenuate sound by 9, 15 or 25 dB. Results showed that the use of earplugs affected the sound level and the spectrum of played sounds. This effect was the greatest for brass players. The difference between SPLs in high-frequency 1/3-octave bands and A-weighted SPLs with and without earplugs exceeded 5 and 15 dB, respectively. Similar changes for woodwind, percussion and string instruments were less noticeable than for brass instruments; they were more than 5 dB for 1/3-octave spectra and no more than 2 dB for A-weighted SPL.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2011, 17, 3; 249-254
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of Assessing the Level of Impulse Sound From Distant Sources
    Autorzy:
    Wszołek, T.
    Kłaczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/89989.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    impulse sound
    noise measurement
    long-term average immission level
    Opis:
    Impulse sound events are characterised by ultra high pressures and low frequencies. Lower frequency sounds are generally less attenuated over a given distance in the atmosphere than higher frequencies. Thus, impulse sounds can be heard over greater distances and will be more affected by the environment. To calculate a longterm average immission level it is necessary to apply weighting factors like the probability of the occurrence of each weather condition during the relevant time period. This means that when measuring impulse noise at a long distance it is necessary to follow environmental parameters in many points along the way sound travels and also to have a database of sound transfer functions in the long term. The paper analyses the uncertainty of immission measurement results of impulse sound from cladding and destroying explosive materials. The influence of environmental conditions on the way sound travels is the focus of this paper.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2007, 13, 4; 433-440
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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