The Japanese Journal of Ergonomics
Online ISSN : 1884-2844
Print ISSN : 0549-4974
ISSN-L : 0549-4974
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Volume 13, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • A study on visibility of round indicators
    A relation with the number of indicators and the time needed to read
    Nobutake FUKUDA, Moriji INAMI, Gingo ASO
    1977 Volume 13 Issue 2 Pages 41-46
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.41
    JOURNAL FREE ACCESS
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    The purpose of this study was to investigate the appropriate number of round indicators on a console where they were arranged side by side.
    The verval response time in reading each indicator was compared between different numbers of indicators.
    The mean response time of six subjects increased smoothly from 1.17sec for a single indicator up to 1.52sec for seven indicators.
    The t-test concerning the difference in mean response time gave the results that the difference between the two-and three-indicator displays or that between the four-and five-indicator displays was not significant. The difference in respnose time between five and six indicators and that between six and seven indicators were highly significant.
    These results suggest that the display of an even number of indicators is easier to read than that of an odd number of indicators, and that the number of round indicators arranged side by side should not be more than five.
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  • Study on a thermal manikin
    Kazuo MIHIRA, Hideto TAYA, Hiroshi ARAI
    1977 Volume 13 Issue 2 Pages 47-53
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.47
    JOURNAL FREE ACCESS
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    The manikin that provides for the thermal characteristics similar to that of the human skin has been manufactured on the experimental basis, as an equipment to evaluate the thermal environment of a room and thermal retaining property of clothes (clo, value) from the human aspect, and its performance is discussed.
    This life size manikin is constructed using seventeen embossed and thermally isolated aluminium plates. Each part of the manikin is equipped with heating elements and a temperature sensor. Its surface temperature and amount of heat supplied are controlled by the separated thermo-regulates.
    It is observed that the manikin can simulate the human thermal characteristics well under non-sweating conditions, and several cases of evaluation by the use of manikin are discribed.
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  • Studies of sensory in U. S. A.
    Tenji WAKE
    1977 Volume 13 Issue 2 Pages 54
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.54
    JOURNAL FREE ACCESS
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  • A study of the effect with compensative external loads on arm control system
    Akira NAGATA
    1977 Volume 13 Issue 2 Pages 55-61
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.55
    JOURNAL FREE ACCESS
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    Compensative elements of arm control systems which were corresponding to constant tension, elasticity, viscosity and inertia loads, were attached to the fore-arm of subjects externally. These loads were generated from the new apparatus which were used with rotation and torque of the servo-motor. The effect of compensative loads were estimated with Bode diagram and Nyquist chart of arm control systems.
    Results of this study were as follows: 1) By means of elasticity (spring) load, control systems were got with changes of fast phase and high gain of arm movement. 2) By viscosity (damper) load, phase and gain of arm control were growed up forward and larger, and rapidity and stability of these systems were decreased. 3) Adding inertia (mass) load to the arm, control systems were not improved remarkably and were turned into unstability. 4) Coherance of control systems were changed into high frequency in proportion to wide displacement of arm movement. 5) In low frequency ranges of arm control, these external loads had more obvious effects than in high frequency zones of that. Optimal ranges of arm control were determined on 0.25-0.50Hz of motor frequency.
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  • Fault tree analysis and human factor engineering
    (II) mathematical methods for fault tree analysis
    Takeo YUKIMACHI
    1977 Volume 13 Issue 2 Pages 62-69
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.62
    JOURNAL FREE ACCESS
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  • Hand locomotion in machines work
    Kiyoshi FKAYA, Akira SUGIMOTO, Yoshinobu SATO
    1977 Volume 13 Issue 2 Pages 70-71
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.70
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1977 Volume 13 Issue 2 Pages 72-73
    Published: April 15, 1977
    Released on J-STAGE: March 11, 2010
    DOIhttps://doi.org/10.5100/jje.13.72
    JOURNAL FREE ACCESS
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