The Japanese Journal of Ergonomics
Online ISSN : 1884-2844
Print ISSN : 0549-4974
ISSN-L : 0549-4974
Search
Advanced search
OR
Browse
Search
Volume 48, Issue 4
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Contribution
  • The Relation between Characteristics of Defects and Detection Rate in Visual Inspection using the Peripheral Vision
    Keisuke SHIDA, Hitomi MUROYAMA, Ikuo MIURA
    2012 Volume 48 Issue 4 Pages 163-169
    Published: August 15, 2012
    Released on J-STAGE: October 31, 2012
    DOIhttps://doi.org/10.5100/jje.48.163
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In order to consider visual inspection utilizing peripheral vision, this paper examines the differences of defects that affect the defects detection. As the features of defects, the size, lightness and color are experimental factors. As the result, the smaller size of the defects shows that the defect detection is difficult. In addition, it is obtained experimentally that the difference of lightness and color between the background and defects can be evaluated by the luminance. The difference of lightness between the background and defects is smaller, the defect detection is more difficult. Moreover, the index of difficulty to detect defects is proposed by multiplying the area of the defect to the luminance contrast, the validity of the index is revealed experimentally.
    View full abstract
    Download PDF (1642K)
  • Psycho-Physiological Evaluation by Stereoscopic Display Systems in Artifacts
    Junki YOSHITAKE, Sanghyun KIM, Hiroyuki MORIKAWA, Reiko MITSUYA, Takas ...
    2012 Volume 48 Issue 4 Pages 170-178
    Published: August 15, 2012
    Released on J-STAGE: October 31, 2012
    DOIhttps://doi.org/10.5100/jje.48.170
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this study, a basic examination on psycho-physiological effects by display systems of stereoscopic 3D images (3D) was carried out. Time-multiplexing and spatial-multiplexing systems were focused as major 3D display systems for consumer use. Characteristic artifacts of each system were extracted, and their psycho-physiological effects were evaluated.Concretely, phantom array, pseudo parallax and flicker from time-multiplexing system, and binocular-rivalry, pseudo parallax and reduction of resolution from spatial-multiplexing system were defined as characteristic artifacts and represented by simple visual stimuli for experiments. From the results of the experiments, inductions of the artifacts were confirmed, and the psycho-physiological responses of the participants were changed by the intensity or combination of the artifacts. In addition, individual difference of the artifacts in the psycho-physiological effects and the interactions, and possibilities to reduce the effects by presentation methods were suggested.
    View full abstract
    Download PDF (816K)
  • Management Competencies Influencing IT Project Performance
    Yukiko OTSUKA, Ken'ichi TAKANO
    2012 Volume 48 Issue 4 Pages 179-186
    Published: August 15, 2012
    Released on J-STAGE: October 31, 2012
    DOIhttps://doi.org/10.5100/jje.48.179
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    As to competencies of carrying out, 42 management processes defined in “The guide to Project Management Body of Knowledge (PMBOK)” were replied as a self-assessment for about 200 Project Manager(PM)s in information and communication technology field. Obtained results of questionnaires were analyzed by factor analysis and 9 factors were identified such as “risk management”, “progress management”. Difference in extracted factor's score between PMs having successful out come in latest project and PMs having unsuccessful out come in latest project were compared. Then these factor's relationships were analyzed by pass analysis. As a result, the influence of “deliverable management” factor for time performance and the influence of the “requirement management” factor for cost performance were verified. Additionally, the “progress management” factor influenced for these 2 factors. These results indicated importance of 3 competency factors (deliverables management, requirement management, progress management) for IT project success.
    View full abstract
    Download PDF (728K)
  • Stiffness Parameter Estimation of the Muscle for Six Muscle Model using the Longitudinal Elastic Modulus Search with Gradient Method
    Ryohei MERA, Hiroshi OKAJIMA, Nobutomo MATSUNAGA, Shigeyasu KAWAJI
    2012 Volume 48 Issue 4 Pages 187-195
    Published: August 15, 2012
    Released on J-STAGE: October 31, 2012
    DOIhttps://doi.org/10.5100/jje.48.187
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A six-muscles model of the human arm is useful to analyze dynamic tasks because the stiffness and the joint torque can be estimated easily by the muscle activity and the arm posture angle. The estimation method of the six-muscles model is required to achieve the stiffness analysis in the dynamic task. However, it is difficult to estimate stiffness parameters on any actual tasks because the muscle model has many bio-parameters and it has nonlinear terms in the previous estimation method. We propose a new estimation method of stiffness parameters in the six-muscles model. We assume the each muscle has same elastic property and the elastic coefficients of the muscles are determined based on a common longitudinal elastic modulus. Then, well known least square method with the gradient method of the longitudinal elastic modulus can be applied for the muscle parameters estimation. Moreover, the effectiveness of the estimation method is evaluated by stiffness analysis comparing with the results in previous studies.
    View full abstract
    Download PDF (1249K)
Short communication
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top