Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene)
Online ISSN : 1882-6482
Print ISSN : 0021-5082
ISSN-L : 0021-5082
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Volume 17, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • An epidemiologic consideration about the reason of high occurrence of cerebrovascular lesions in Japan
    Eiji Takahashi
    1962 Volume 17 Issue 2 Pages 81-94
    Published: June 10, 1962
    Released on J-STAGE: April 03, 2009
    DOIhttps://doi.org/10.1265/jjh.17.81
    JOURNAL FREE ACCESS
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    In order to examine critically the reason why so many deaths by cerebrovascular lesions occur among Japanese, correlation coefficients between mortality from cerebrovascular lesions as well as from arteriosclerotic and degenerative heart disease on the one hand and national average supply, on the other, of 10 groups of foodstuff were computed in 20 western countries. Vital statistic data in those countries were taken from the reports of WHO. Significant correlations were found between the death rate by cerebrovascular lesions and the national average supply of cereals (positive), and of fats and oils (negative). Those nations which consumed more cereals, less fats and oils, less milk, and less potatoes and other starchy roots seemed to show more deaths from cerebrovascular lesions.
    In the U.S.A., where Negroes followed Japanese in the mortality from cerebrovascular lesions, the death rate was highly distributed in the southern states. Common nutritional deficiency was found among inhabitants in the southern states of the U.S.A. and in Japan. Besides vitamin deficiency, Ca-deficiency which prevailed not only in finished water but also in food, was suspected as a cause of high occurence of cerebrovascular lesions in both populations.
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  • Human Factors in Card Punching Operation
    Masakazu Kurata, Sadayoshi Shigeta
    1962 Volume 17 Issue 2 Pages 95-102
    Published: June 10, 1962
    Released on J-STAGE: April 03, 2009
    DOIhttps://doi.org/10.1265/jjh.17.95
    JOURNAL FREE ACCESS
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    Man-machine system in card punching operation was analyzed specially interested in the relation of the display in machine to the receptor in man and of the control in machine to the muscle as an effector. The physical environment within which the card punching was carried out was also evaluated by the output of man-machine system.
    A large number of misspunching seems to be caused by the manner of decoding numerals in information receiving and decision making processes. The physiological capacities of fingers on this operation were measured in connexion of speed, accuracy, force and working area. It is obvious that the load of each finger is not fitted to the physiological and psychological abilities presented by punchers, so far as our experimental condition is concerned. It is suggested that the fitting the machine to the man at work is quite necessary in this case on the efficiency of the system.
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  • Studies on the discrimination of amplitude
    Akira Okada
    1962 Volume 17 Issue 2 Pages 103-106
    Published: June 10, 1962
    Released on J-STAGE: April 03, 2009
    DOIhttps://doi.org/10.1265/jjh.17.103
    JOURNAL FREE ACCESS
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    Experimental studies were made, with the following briefly stated results, on the discrimination of amplitude in case of whole body vibration.
    1) Δ a mm, the discriminated amplitudes from several amplitudes, in case of increased series existed in the range from 0.24 to 0.63 mm and in case of decreased series existed in the range from 0.17 to 0.73 mm.
    2) The higher the frequency of vibration, the smaller was the Δ a mm in case of transversal and longitudinal vibration.
    3) Δ a/a in case of the smallest amplitude was greatest than in case of the other amplitude.
    4) The discrimination in case of amplitude was weaker than in case of frequency.
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  • Studies on the ratio sensibility of vibration
    Akira Okada
    1962 Volume 17 Issue 2 Pages 107-108
    Published: June 10, 1962
    Released on J-STAGE: April 03, 2009
    DOIhttps://doi.org/10.1265/jjh.17.107
    JOURNAL FREE ACCESS
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    Experimental studies were made, with the following briefly stated results, on the ratio sensibility which set on the basis of amplitude 1 mm, in case of whole body vibration.
    The loudness of vibratory sensibility, in case of twofold the stimuli, agreed nearly with the magnification of stimuli. But in case of three-, four- and fivefold the stimuli, the loudness of vibratory sensibility was exceedingly greater than the magnification of stimuli. The relation between the loudness of vibratory sensibility and the stimuli, in case of vertical vibration at 10 c/s, is represented approximately by
    S=2n-1
    where n: the amplitude in mm
    S: the number which show the loudness of vibratory sensibility against the vibration of amplitude 1 mm in fold.
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