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Volume 42, Issue 3
Displaying 1-7 of 7 articles from this issue
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Towards design of console box suitable for older adultsMakoto MORIWAKA, Atsuo MURATA, Takashi OHKURA2006 Volume 42 Issue 3 Pages 157-163
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThe purpose of this study was to discuss a usable console box especially for older adults. EMG (Electromyography) and 3-dimensional motion analysis, as well as, psychological rating of usability, were used to evaluate the usability of console boxes. Two types of console boxes (A: pull-up type console box and B: slide type console box) were prepared. Age was considered as an experimental factor. As for the EMG analysis, participants were required to open and close these console boxes. %MVCmax (Maximum Voluntary Contraction), RMS (Root Mean Square) and MPF (Mean Power Frequency) were evaluation measures. Evaluation measures of 3-dimensional motion analysis included velocity and acceleration of wrist on the left arm and power of left forearm and upper arm. Psychological rating of usability was also conducted. Based on these evaluation measures, the usability of two types of console boxes was evaluated. The physical workload of the slide-type console box (B) was less than that of the pull-up type console box (A). The psychological rating of usability for the console box (B) was also higher than that for the console box (A). Although the physical and psychological workload for the slide-type console box (B) was as a whole lower than that for the pullup type console box (A), the workload of the console box (B) was still heavy especially for older adults. The results suggest that the console box (B) should be further improved.View full abstractDownload PDF (8182K) -
Koji OMINO, Hiroaki SHIROTO, Hiroharu ENDOH, Hiroshi SEINO2006 Volume 42 Issue 3 Pages 164-171
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSAn experiment was conducted as intended to obtain a fundamental data to achieve an optimal braking pattern, which should be realized by brake control technology in the future. Considering the characteristics of brakes equipped with commercial trains, braking patterns in waveforms of a trapezoid was set up. The ratio of acceptable response, as an index of ride comfort, was obtained for each of 28 different braking patterns combined with the degrees of constant decelerations corresponding to the height of the trapezoid and the jerks corresponding to the inclination of the leg. The averages of subjective rating of breaking intensity and the ratio of subjects unable to maintain their initial postures were simultaneously obtained.
The ratio of unacceptable response, the rating of braking intensity, and the ratio of not able to maintain the initial postures were expressed respectively as estimated equations containing the degree of constant deceleration and that of the jerk as independent variables. The optimal pattern was theoretically discussed with these results. The estimation of the degree of constant deceleration and that of the jerk specific to the optimal pattern was concluded under the condition of a certain initial velocity and a certain distance to make a stop.View full abstractDownload PDF (9684K) -
Osamu ICHIKIZAKI2006 Volume 42 Issue 3 Pages 172-180
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSPrevention of mistakes such as assembly defectiveness and lapse are one of the important problems in plants, but it is difficult to prevent mistakes made by workers who have acquired the work procedure because it occurs accidentally. The objective of this paper is to lead knowledge about actions to prevent such mistakes. For mistakes in a work procedure, experiments by the simple tasks that do not need difficult skills are conducted. By analysing the difference of counts of mistakes and contents of mistakes between the state that work procedure acquired and the state not acquired, findings are obtained as follows; when operation is not possible without attention even work procedure acquired, mistake recurred again by time limits, and procedure mistakes tended to increase particularly. In addition, it is suggested that mistakes occurring by certain timing promote the acquisition of work procedure and prevent mistakes. It is important to consider these to prevent mistakes and to examine effective training method.View full abstractDownload PDF (7181K) -
An Approach with Data ClusteringSusumu YAMADA, Tatsuya SUZUKI, Shin-kichi INAGAKI, Soichiro HAYAKAWA, ...2006 Volume 42 Issue 3 Pages 181-189
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSThis paper presents a new analysis technique of the human driving behavior based on expression as the Piece Wise Linear (PWL) model together with application to driver's collision avoidance behavior. The driving data were collected by using the three-dimensional driving simulator based on CAVE, which provides stereoscopic immersive vision. The identification problem for the PWL model was solved by combining the Data Clustering technique and the Support Vector Machine. From the obtained results, it became possible to capture not only the physical meaning of the driving skill, but also the decision-making aspect (switching conditions) in the driver's collision avoidance behavior.View full abstractDownload PDF (10595K) -
Masumi TAKEDA, Yoko WATANABE, Ryoko TAKAHASHI, Masaki TAUCHI2006 Volume 42 Issue 3 Pages 190-199
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSIn the present study, usefulness of the standardized tactile guiding bar tile for direction taking was evaluated by measuring veering while vision impaired persons walk. For direction taking, two bar tiles of 30cm square were placed on the floor side by side in front of experimental subjects. The orientation of these tactile bars was either parallel or perpendicular to the direction to walk. Under each condition, each subject was instructed to either slide their foot, or step, on the tiles, and then walk for 10m distance. The amount each person veered from a straight line drawn through the center of the direction cue was measured at 1-meter increments. In the first half of the distance traveled, the least veering occurred when subjects started by stepping on a tile oriented perpendicular to them. Subjects veered more when the combination of tile-orientation and foot-contact was parallel/slide and parallel/step. By contrast, subjects expressed more confidence about decision based on different combinations of bar-orientation and foot-contact, i. e. their order of preference was parallel/slide, parallel/step, and perpendicular/step. This discrepancy in order between veering and confidence seemed to result from subjects' daily experience in using tactile tiles in actual environments.View full abstractDownload PDF (9721K) -
Kaname HIRAYANAGI2006 Volume 42 Issue 3 Pages 200-211
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSDownload PDF (6968K) -
Toshiyuki YAMASHITA, Yoshinori TAKEUCHI2006 Volume 42 Issue 3 Pages 212-215
Published: June 15, 2006
Released on J-STAGE: March 15, 2010
JOURNAL FREE ACCESSDownload PDF (491K)
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