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Volume 26, Issue 4
Displaying 1-6 of 6 articles from this issue
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Hisao NAGATA1990 Volume 26 Issue 4 Pages 173-180
Published: August 15, 1990
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSA new test apparatus to give abrupt accelerations to a human standing body was designed and set up by an application of the principle of catapult. The platform was accelerated horizontally at a distance of 40cm in the experiments. The accelerations were increased step by step until each of subjects of five elderly or five young males lost his balance and impended. The critical acceleration was measured for 16 directions around each of standing subjects with barefoot. The coefficients of variation of measured values were 14.1 in young subjects and 17.5 in elderly subjects. The measured values in young subjects by different positions of stance were very similar to theoretical values. And a clear distinction among step-length or age-groups could be seen in experimental results. Furthermore the small portion of standing ability depending on foot-fingers could be detected. It would be concluded that this measuring technique will be very practical to estimate stability of standing posture numerically, and will be capable to apply to evaluate dimensions of stairs, working platforms, handrail, footwear etc. by checking the extent of stability of standing posture.View full abstractDownload PDF (7367K) -
Tsuneto IWASAKI, Shinobu AKIYA1990 Volume 26 Issue 4 Pages 181-184
Published: August 15, 1990
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe changes of CFF values in both eyes were grasped in time course every 10min during 30min sustained the visual load with CRT display screen and to discuss about that changes was made in this paper. The visual load was that the image of numerical formula was given on the one eye (loaded eye) as the stimulus and on another eye (control eye) the image of the background of CRT was given spontaneously. Both images were fused by prism. In proportion to the time taken for the visual load, the decrease of CFF values and the CFF dependence in the loaded eye were very higher than that of the control eye. There were significant differences between both CFF values. These results suggested that the decrease in the CFF value of the subject did not signify the decline in the activity of the central function, but the prechiasmal visual pathway such the retina or the optic nerve.View full abstractDownload PDF (493K) -
Yusaku OKADA1990 Volume 26 Issue 4 Pages 185-192
Published: August 15, 1990
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe aim of this research is to characterize the human behavior, concerning the level adjustment of steam generator (SG) when the operator switches over the flow-lines in PWR nuclear power plants. From the results of the experiments, we observed that the behavior changed as the operation progressed. The process of operation was classified into two categories; called as “in-progress of operation”, and “operation-end”.
Among “in-progress of operation”, there existed two strategies. When the subject could take the first strategy, the difference between the level of SG and the reference could be kept low. However, under the second strategy he could only control the flow through the bypass line so that the level of SG became unstable.
In “operation-end”, it was found difficult to stabilize the level of SG under each experimental condition. Then, we suggested two improvements; (1) inform that the flow through the bypass line approaches 0, (2) after (1) was performed, decrease input gain of each controller automatically. At the verification experiment with the improvements, it was obtained that the level of SG could be stabilized even in “operation-end”, and the validity was confirmed.View full abstractDownload PDF (1088K) -
Ichiro TOKUHIRO, Kiyoshi HASHIMOTO1990 Volume 26 Issue 4 Pages 193-202
Published: August 15, 1990
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThis paper proposes a new method of matching based on a hierarchically structured model which can effectively represent the nonstationary property of speech wave. The method begins with the roughest matching with many patterns, and then proceeds to the finer matching with less patterns. This procedure is not only suitable to obtain high recognition performance for speech pattern but can reduce the count of calculation necessary for the recognition more than 28% compared with the ordinary DP matching method.
The experiment conducted on 68 Japanese monosyllables showed the average recognition rate 89.8%, which was 7.2% higher than the ordinary DP matching.View full abstractDownload PDF (1311K) -
Am CHO, Kageyu NORO1990 Volume 26 Issue 4 Pages 203-209
Published: August 15, 1990
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe productivity, safety and conditions of the working environment are closely connected to Ergonomics. This paper describes the usage and application of Ergonomic methods in quality control activities in Korea. The final purpose of this study would be used in the future to develop a systematic approach to appling Ergonomics in Korean industry. The outline of the results are; (1) In the Korean industries, the percentage using Ergonomic methods in QC activities was 53.3%. In these cases the methods were applied mostly to increasing productivity and improving quality control. Other cases application that were found are to workers' motion study and improved design of tools and equipment. (2) The areas of application of Ergonomic methods were found in increasing efficiency, improving products and reducing costs. (3) “The Ergonomics for QC circle education curriculum” to promote the spread of Ergonomics to industry constituent in Korea is proposed.View full abstractDownload PDF (4582K) -
Kazushi TAODA, Katsuo NISHIYAMA, Shinya WATANABE1990 Volume 26 Issue 4 Pages 211-213
Published: August 15, 1990
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (1779K)
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