The Japanese Journal of Ergonomics
Online ISSN : 1884-2844
Print ISSN : 0549-4974
ISSN-L : 0549-4974
Volume 17, Issue 6
Displaying 1-7 of 7 articles from this issue
  • Takashi SUTO, Kenji KARIYAMA, Akira OTSUKA, Michiru AKAMATSU, Takaaki ...
    1981 Volume 17 Issue 6 Pages 251-258
    Published: December 15, 1981
    Released on J-STAGE: March 11, 2010
    JOURNAL FREE ACCESS
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  • Masahiro SUGIYAMA, Hideo KIRISHIMA, Akihiko HIRATANI, Tatsuya OYAGI
    1981 Volume 17 Issue 6 Pages 259-265
    Published: December 15, 1981
    Released on J-STAGE: March 11, 2010
    JOURNAL FREE ACCESS
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  • Takashi KOMURA, Mitsuo MIYAHARA, Tomohiko TAKAMOTO, Hiroshi SASAKI
    1981 Volume 17 Issue 6 Pages 267-272
    Published: December 15, 1981
    Released on J-STAGE: March 11, 2010
    JOURNAL FREE ACCESS
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  • scientific basis of jumping form
    Kazuhiko WATANABE
    1981 Volume 17 Issue 6 Pages 273-276
    Published: December 15, 1981
    Released on J-STAGE: March 11, 2010
    JOURNAL FREE ACCESS
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  • Yutaka SHIMIZU, Tenji WAKE
    1981 Volume 17 Issue 6 Pages 277-284
    Published: December 15, 1981
    Released on J-STAGE: March 11, 2010
    JOURNAL FREE ACCESS
    An apparatus which transforms visual information to auditory output, was considered and designed. The system transforms visual image into 25×25 dot elements using a CCD image sensor and produces sound output. The vertical position of elements are displayed by frequency codes, and horizontal position of them are presented to each ear through binaural headphone by the ratio of sound amplitude.
    Experiment showed that optimum sound presentation time was over 2.0 seconds for letter image recognition. Also the best case achieved 90 percent correct response in Katakana recognition, and 91 percent correct response in alphabet recognition. According to the results, similarity of letter images were analyzed by the hierarchical clustering scheme and discussed through the Dendrograms.
    These notions will be applied for visual substitution system on a pattern recognition and an obstacle detection method for the blind.
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  • Kiyotoshi MATSUOKA
    1981 Volume 17 Issue 6 Pages 285-289
    Published: December 15, 1981
    Released on J-STAGE: July 01, 2010
    JOURNAL FREE ACCESS
    The purpose of this paper is to show that smooth pursuit eye movements [SP] are not simple responses to moving retinal images but highly cognitive ones. Two experiments are presented to support this notion. In both the experiments, subjects are instructed to eye-track imaginary targets which are moving in the opposite direction to the actual moving stimuli. The results show that SP can be elicited by perceived motion rather than retinal slip of the visual images. The effects of SP upon motion perception are also discussed.
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  • Keisuke NOMA, Hideo TANAKA, Kiyoji ASAI
    1981 Volume 17 Issue 6 Pages 291-297
    Published: December 15, 1981
    Released on J-STAGE: March 11, 2010
    JOURNAL FREE ACCESS
    This paper proposes the Fuzzy Fault Tree Analysis in which the fuzzy probabilities of the basic events are handled. The fuzzy probability, which means the possibility distribution concerning the occurrence of the event, is a fuzzy set on interval [0, 1]. The fuzzy sets theory was defined by L. A. Zadeh in 1965. This application of fuzzy sets theory to the fuzzy fault tree is effective to evaluate the grade of influence to what extent fuzziness of probability concerning basic events spreads the probability of the top event. The membership function are supposed to be of house-shaped in probability calculations. In a sense the machine failure rate or human error rate can be usually specified by a standard point, a lower limit point and an upper limit point. This fuzzy probability can well fit actual cases. The Fuzzy Fault Tree with house-shaped membership function is discussed using a simple example.
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