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Volume 24, Issue 4
Displaying 1-9 of 9 articles from this issue
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The effect of illuminationSatoru YAMADA, Koji MOROOKA1988 Volume 24 Issue 4 Pages 209-217
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSOn the VDT work, the effect of illumination which was set up on 10, 32, 100, 320, 1000lx was discussed. Eleven male subjects were carried out the KANJI correction test and CFF and heart rate were measured.
As the result, on 10, 32, 100lx, awakening level was fallen by relation between illumination and letter luminance and working accuracy was fallen, too. On 1000lx, after the KANJI correction test awakening level was fallen, but working accuracy was not fallen. On 320lx, it was found out that awakening level and working accuracy were not fallen.
Consequently, it was clear that variation of illumination on the VDT work influenced the rise and fall of awakening level and legibility as the variation of light stimulus and contrast.View full abstractDownload PDF (981K) -
Tetsuya MURAOKA, Mikiya KAWAMURA, Hiroe UESAKO1988 Volume 24 Issue 4 Pages 219-226
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSSeven segments numerical light emitting display devices installed in cars have been used at night and day. At that time, characters of the brightness vision have been most influenced by the illuminance.
Then various tests were carried to investigate throughly the relations between the illuminance and the point of subjective luminance equalities (hereafter called the PSE) on indicative figures with the light emitting diode (hereafter called the LED), the fluorescent light display device (hereafter called the FLD) and the negative type liquid crystal display device (hereafter called the LCD). The following results were obtained from the various tests.
(1) The light emitting display devices and LCD showed significant differences with respect to the influences with the illuminances and the indicative figures, since the differences of the figure's form and the luminance distribution in the segments.
(2) According to increase of the illuminance, the PSE with LED have gone down and kept equilibrium in 1000lx. The FLD have been slightly influenced by the illuminances. Then the PSE with LCD has decreased suddenly in the illuminance of more than 300lx.
(3) By inspection of Weber ratio, it was found that FLD, LED and LCD were ranked according to their brightness difference discriminations.View full abstractDownload PDF (811K) -
Takuko YANASE, Sayoko KAWASAKI, Sanae HIRATE1988 Volume 24 Issue 4 Pages 227-234
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe purpose of this study is to confirm the effect of aging on the daily physical activity and to clarify the factors which influence on the capacity to perform everyday activities. A survey of questionnaire on the daily living action is carried into 1068 subjects (males and females) ranging in age from forties to actogenarian. Most of subjects take care on their health and have several kinds of hobbies, but there is a negative correlation between age and muscle strength. In addition, the impediment of joint region and sense make them difficult to adapt the living space. As regard to women, the amount of household working time is found to be related to their physical activity levels. The household working thus appears to have the effect of keeping capacity to perform everyday activities. It is necessary to plan the living space in which they can keep activity levels according to their physical conditions.View full abstractDownload PDF (1060K) -
Akinori KOMATSUBARA, Yoshimi YOKOMIZO1988 Volume 24 Issue 4 Pages 235-243
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSOn computer conversational tasks, computer system response time sometimes brings serious psychological work load. Miller, R. B. (1969) pointed out that these factors of expectation, keeping short term memory and psychological closure influence of the psychological work load. In this study, the effects of these factors on psychological, mental and physiological work loads are experimentally studied on long system response time, with easy calculation task. The effect of keeping attention towards appearance of display after computer system response time is also studied. Interview towards the subjects and several questionnaires were conducted. Respiration rate was also measured as the mental load index. It turned out as the results that mental load was highly increased when subjects must keep attention or short term memory during computer system response time. However expectation and closure increased little mental load. It also turned out that the degrees of psychological and physiological load depended on the subjects' strategies to pass the period of computer system response time, that, eg., those who looked around during the period of computer system response time showed less load than those who just observed on CRT.View full abstractDownload PDF (1027K) -
Soon Yo LEE, Mitsuo NAGAMACHI, Koji ITO, Toshio TSUJI1988 Volume 24 Issue 4 Pages 245-252
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe present paper deals with obtaining the properly mixed application criteria for the manual mode, using computer graphic simulation, in order to recover the error effectively occuring in the advanced teleoperator work of man-robot system.
In the experiments, the error which is occurred during performing the automatic mode is recovered by the manual mode properly combined operation by a human and the control program. The result shows an improvement availability of the system not only with efficient combination of the manual mode according to trajectory planning, but also with effective error recovery. Therefore, we suggest that the operation by the control program should be applied to macro-motion of control and the operation by a human to micro-motion of control.View full abstractDownload PDF (831K) -
Yasuko ITOH1988 Volume 24 Issue 4 Pages 253-260
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSMeasurement of objective mental workload is of increasing importance in evaluation of user-machine systems. There are necessity for improving task condition by evaluating workload of operators. Forcussing on biophysiological reactions as objective indices of mental workload, this paper reviews the biophysiological reactions caused by mental workload.
Subjects were required to do four tasks, hitting the indicated keys, under four differrent time pressures. The mental workload of operators was scaled by a method of paired comparisons. The relations between the scaled values and biophysiological reactions were studied, that is CFF, blood pressure, respiratory rate, cardiac interbeat intervals were only considered.
The following results are obtaind. In propotional as subjective mental workload increase,
(1) the values of CFF increase.
(2) the values of minimum blood pressure decrease.
(3) the signals of cardiac interbeat intervals are more changeful.
(4) the spectrum power of the signals of cardiac interbeat intervals in 10-15 beats region (about 0.1Hz) decrease.
Conclusions drawn from this research are presented here in to order provide guidelines for future stress research.View full abstractDownload PDF (828K) -
Sung-heon SHIN1988 Volume 24 Issue 4 Pages 261-264
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (397K) -
Asao KOMACHIYA1988 Volume 24 Issue 4 Pages 265-270
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (727K) -
Yoshio HAYASHI1988 Volume 24 Issue 4 Pages 271-272
Published: August 15, 1988
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (344K)
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