The Japanese Journal of Ergonomics
Online ISSN : 1884-2844
Print ISSN : 0549-4974
ISSN-L : 0549-4974
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Volume 43, Issue 2
Displaying 1-12 of 12 articles from this issue
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  • Development and Evaluation of a Remote Communication System between Wearable and Desktop User with Eye Tracking and HMD
    Takashi NAGAMATSU, Yohei KAIEDA, Yuki KITAGAWA, Tomoo OTSUJI, Hiroyuki ...
    2007 Volume 43 Issue 2 Pages 53-63
    Published: April 15, 2007
    Released on J-STAGE: March 15, 2010
    DOIhttps://doi.org/10.5100/jje.43.53
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    A method that uses the eye gaze information and the AR (Augmented Reality) technology has been proposed to communicate more smoothly than a conventional method in the research area of a remote support system using a wearable computer. A prototype system based on the method was developed. The effectiveness of the two functions that allows a remote expert to see a worker's point of regard and to display a pointer on a worker's HMD (Head Mounted Display) was confirmed in the laboratory experiments. The result showed that these functions were effective in reducing the time to transmit information. Furthermore the information could be transmitted by using the pointers of two functions without speaking. The system can be useful for the communication under urgent and/or noisy situations.
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  • Feature extraction on ship accidents caused by dozing watch-keepers in judgment record of marine accidents inquiry agency judgments
    Shinsuke URUSHIDANI, Yuji SANO, Sonoe MURAMATSU, Miho EHARA
    2007 Volume 43 Issue 2 Pages 64-70
    Published: April 15, 2007
    Released on J-STAGE: March 15, 2010
    DOIhttps://doi.org/10.5100/jje.43.64
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    The purpose of this study was to investigate a feature extraction for dozing among watch-keepers that actually resulted in marine accidents. Marine accidents (n=870) that had been described to the judgment record of the Marine Accidents Inquiry Agency between 1994 and 2003 were used for analysis. The proportion of dozing in all ship accidents ranged from about 3 to 7%, and a marginal rise in this tendency has been seen since 1991. In the situation at the doze shipwreck, “The weather was fine or cloudy”, “The wind force was level-2 or less”, “Watch by one person”, “Autopilot was being used”. The influence of “The passage of time from the departure port is 12 hours or more” (54.4%) characterized the analysis of fishing vessels. The influence of “generated in the Inland Sea (71.3%)” characterized the analysis of cargo ships and tankers. These results suggest that consideration of ship type may be necessary in developing counter measures.
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  • A study on the Heghit of the Handrails to Be Installed in Wheelchair Spaces Shared with Baby Carriage Users in Commuter Trains
    Ayano SAITO, Hiroaki SUZUKI, Hiroaki SHIROTO, Kohei FUJINAMI, Akiko MU ...
    2007 Volume 43 Issue 2 Pages 71-80
    Published: April 15, 2007
    Released on J-STAGE: March 15, 2010
    DOIhttps://doi.org/10.5100/jje.43.71
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    A space in commuter trains for baby carriage users was designed on the assumption the space shared with wheelchair users. Evaluations were obtained from forty-six baby carriage users and sixty-seven ordinary passengers experienced under vibratory condition in a train simulator. As the result, it was apparent that the space equipped with two handrails, one in 950mm high and another in 700mm high are more convenient to compare with the conventional space equipped with one handrail of 800mm in height in view of providing supports and easy seats for standing passengers. The ratio of the baby carriage users who prefer the proposed space was 76.1%.
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  • Three-dimensional motion analysis of upper limb in basketball shot
    Masaki HOKARI, Hitoshi DOKI, Tsuyoshi Saito
    2007 Volume 43 Issue 2 Pages 81-87
    Published: April 15, 2007
    Released on J-STAGE: March 15, 2010
    DOIhttps://doi.org/10.5100/jje.43.81
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    This paper describes a new method to measure and analyze three-dimensional rotation and translation analysis of upper limb in basketball shot form. In general, the shot form is measured by taking the photograph of motion with the high-speed camera and/or video camera and analyzing the photograph with direct linear transformation method (DLT method). The suggesting measurement method was derived by the kinematic human body model analysis. The measurement system developed by using the three dimensional rate gyro sensors set at the several body positions can measure the three dimensional rotations and the three dimensional translations of various parts of body. By using this system, the motion of a thin part such as wrists and ankles can be measured easily. In addition, this system can measure the basketball shot forms of various players correctly.
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  • Study on usability of mobile device in dynamic situation
    Influence on factor of constraint
    Takayuki YAMAGIWA, Isao YOSHIMURA
    2007 Volume 43 Issue 2 Pages 88-96
    Published: April 15, 2007
    Released on J-STAGE: March 15, 2010
    DOIhttps://doi.org/10.5100/jje.43.88
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    The purpose of this study is to lead knowledge about a usability of mobile device in dynamic situation, walking or outside operating etc, focusing influence on factor of constraint (ex. time pressure or multitude density). In general, mobile devices have many operating in dynamic situations compared with currently devices or machines. For these reasons, it is considered that examinations considering “in Situ”-lead to various constraints-are necessary in the case of discussing the usability of mobile devices. On experiment, a subject walking over treadmill is imposed factor of constraint, in that time, measurement index (error ratio, operation time, number of checking around, operation velocity etc) are analyzed. The results show that there are some influences on factor of constraint, and three conclusions are recognized.
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  • Effect of Peripheral Vision for the Eye Movements in Driving
    Tetsuya MIYOSHI, Hidetoshi NAKAYASU, Daisuke SUZUKI
    2007 Volume 43 Issue 2 Pages 97-100
    Published: April 15, 2007
    Released on J-STAGE: March 15, 2010
    DOIhttps://doi.org/10.5100/jje.43.97
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