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Volume 39, Issue 4
Displaying 1-5 of 5 articles from this issue
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Takashi YOKOI, Fuminari KANEKO, Hiroshi YAMADA, Kazunori HASE, Kikue S ...2003 Volume 39 Issue 4 Pages 145-152
Published: August 15, 2003
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe distance between a wall and the anterior side of the human body was evaluated based on kinematic and psychological characteristics of the standing-up and sitting-down movement. The experiment was carried out by setting up a variable experimental space. Both the chair height and the distance between a wall and the subject's body were varied at random in the experimental setup. The adult subjects were asked to perform standing-up and sitting-down movements. The body landmark positions in these trial movements were measured using a motion-capture system. Each subject was asked to evaluate pressure sensation based on the feeling of pressure given by the wall during the motion. According to the above experiment, following results were obtained: 1) When distance between chair and wall (D [m])≤0.8, the pressure sensation was felt both when standing up and sitting down, while the movements were restricted by the wall. 2) In the case of 0.8<D<1.3, the standing-up and sitting-down movements were not restricted by the wall, but a few pressure sensation was felt. 3) In the case of 1.3≤D, the movements were able to be done naturally without any pressure sensation.View full abstractDownload PDF (3623K) -
Hiroyuki UMEMURO, Jun YAMASHITA2003 Volume 39 Issue 4 Pages 153-161
Published: August 15, 2003
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis study investigated changes in pupil diameter when computer users were confused or surprised, and proposed a practical method to detect those situations. Pupil diameters of 5 male subjects aged between 20 and 23 were recorded while doing a memory task on a computer. Among the trials of primary memory task, 8 special trials were presented; 4 expected to cause confusion and 4 to cause surprise. Results demonstrated that if distributions of pupil diameter for given task conditions were known, subjects' confusion and surprise could be detected at rates of 25% to 65%. Detection rates varied depending on the settings of boundaries and the nature of the confusion and surprise conditions. The causes of this variation were discussed. Potential applications of this study include intelligent training systems that provide users with appropriate advice when users are troubled.View full abstractDownload PDF (1219K) -
Yoshitada YAMAGISHI, Hikaru INOOKA, Feng WANG2003 Volume 39 Issue 4 Pages 162-168
Published: August 15, 2003
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis paper studied the relationship between the ride discomfort and the lateral acceleration of automobiles. Subjects rated their ride discomfort caused by the maneuver of a mini-van type automobile they rode. Their rating scores were recorded together with the lateral acceleration of the automobile. Relationship between the rating scores of ride discomfort and the lateral acceleration/jerk was investigated. Multiple regression analysis with the lateral acceleration and jerk as the explanatory variables and the subjective ratings of ride discomfort by the subjects as criterion variables was carried out to model the relationship between ride discomfort and acceleration/jerk. Then the differences between three different postures were shown by comparing their models.View full abstractDownload PDF (1058K) -
Hidenori AKAHA, Kazuo AOKI, Hidetoshi HOSHIKAWA2003 Volume 39 Issue 4 Pages 169-179
Published: August 15, 2003
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe purpose of this study is to examine the effects of ankle fixation during pedaling to learn the skill to develop the performance of cycling. Three experiments were conducted to measure the cycling performance under the condition of the settled power (250W), the effects of ankle movement under the fixed crank position, and the maximum power in the maximum effort for 10 seconds. The results that effects of ankle fixation are as follows; 1) Joint power slightly increased in hip and decrease in knee, although there was no significance. 2) Joint torque was not changed in knee and hip. 3) Angular velocity significantly increased in both flexion and extension of hip across all trials, and significantly decreased in extension of knee. 4) Maximum power tended to slightly decrease but not significant. These results suggests that the ankle fixation is useful technique to learn the effective pattern of joint movement, because the change of angular velocity by ankle fixation leads the change of joint power and promotes activities of hip movement during pedaling. But it was also indicated that this technique did not improve the maximum power directly.View full abstractDownload PDF (5351K) -
Takeshi SAKAMOTO, Katsuyuki MIYAJIMA, Toshiyuki YAMASHITA2003 Volume 39 Issue 4 Pages 180-185
Published: August 15, 2003
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (2930K)
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