The Japanese Journal of Ergonomics
Online ISSN : 1884-2844
Print ISSN : 0549-4974
ISSN-L : 0549-4974
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Volume 49, Issue 4
Displaying 1-15 of 15 articles from this issue
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Contribution
  • Estimation of a 3D Hand Model for the Target Users of the Given Gloves
    Noritsune YOKOYAMA, Natsuki MIYATA, Koji HASHIMOTO, Takehisa KURAMOTO, ...
    2013 Volume 49 Issue 4 Pages 161-169
    Published: August 15, 2013
    Released on J-STAGE: February 01, 2014
    DOIhttps://doi.org/10.5100/jje.49.161
    JOURNAL FREE ACCESS
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    Engineers have empirically designed glove casts without detailed knowledge on hand morphology of target users. For clarifying the know-how of glove cast designing, relationship between glove cast and hand morphology of users who are satisfied with the gloves produced using the glove cast should be investigated. Therefore, we proposed a method to build a three-dimensional hand model of users who are satisfied with the fit of gloves produced using a cast. Fifteen male subjects evaluated the fit of a glove using visual analogue scaling method, and 35 measurements were taken on their right hands. Eight regression equations to estimate fit evaluation scores from hand measurements were obtained. Eight hand measurements that corresponds to the evaluation score 0 (good fit) were calculated from the obtained regression equations. Other 35 measurements were estimated from the eight hand measurements using regression equations derived from a hand measurement database. A hand model was built by appropriately scaling the generic model to satisfy the given 42 hand dimensions. The hand model contains the information on the proper relationship between morphologies of the glove cast and user hands. The fit of the glove would be improved by modifying the cast to accord with the hand model.
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Ergonomic data
  • Actual Situation and Features of Industrial Accidents Related to use of Roll Box Pallets（RBP）
    Akihiro OHNISHI
    2013 Volume 49 Issue 4 Pages 175-182
    Published: August 15, 2013
    Released on J-STAGE: February 01, 2014
    DOIhttps://doi.org/10.5100/jje.49.175
    JOURNAL FREE ACCESS
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    This study aimed to obtain an overview of roll box pallets（RBP）accidents in various industries. RBPs are a type of manual, four-wheeled, material-handling equipment. Although they are widely used in almost all industries, however, it was found that many RBP-related industrial accidents especially happened in the transportation industry. To examine the features of accidents based on reports of more than 4 days absence from work, 25.5％ of the random sampled industrial accidents reported in 2006 were analyzed. The following five main results were observed：1）285 RBP-related accidents occurred in the year 2006, representing 0.83％（95％CI：0.73～0.93）of all accidents, hence the accidents occurred in a year could estimated 1,115 （95％CI：980～1,249）；2）fractures accounted for 51.2％of the accidents；3）these accidents had occurred mainly in the transportation industries；4）it is important to educate for RBP operation and risks of injury at the time of employment for novices；and 5）RBP-related accidents were categorized into five patterns, the most frequent（42.1％）one resulting from workers being struck by or pinned under RBP. These findings indicate that the use of protective equipment for the hands and feet can reduce the risks of such RBP-related injuries. Because the pinned under RBP accidents could lead to fatalities or serious injuries, a forklift or a hand pallet truck should be used. But these machines are not always available, it is urgent to consider some new measures.
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  • An Influence of the Amount of Retinal Disparity on the Latency for Recognition of the Caption Text in Stereoscopy
    Daiki TERAMOTO, Kazuyoshi MURATA, Yu SHIBUYA
    2013 Volume 49 Issue 4 Pages 183-189
    Published: August 15, 2013
    Released on J-STAGE: February 01, 2014
    DOIhttps://doi.org/10.5100/jje.49.183
    JOURNAL FREE ACCESS
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    In this study, we performed an experiment to evaluate the influence of the amount of disparity of the 3-D object on recognizing the caption text in the 3-D image. In the experiment, the amount of retinal disparity of the 3-D object was changed while that of the caption text was fixed to zero. Participants were asked to watch a 3-D object on the display and also asked to utter a caption text randomly displayed below the object. We measured the latency from when a caption text was displayed to when the participant uttered it. The influence of the amount of disparity of the 3-D object on recognizing the caption text in the 3-D image was evaluated with the above latency. The result showed that the latency for recognition of the caption text tended to be longer when the 3-D object was fused in front of the screen than behind it.
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