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Volume 30, Issue 2
Displaying 1-5 of 5 articles from this issue
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Mitsuhiko KARASHIMA, Toshihiko OKAMURA, Murako SAITO1994 Volume 30 Issue 2 Pages 63-69
Published: April 15, 1994
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThis study was made to examine a proper quantity of information presentation on a man-machine system. Three kinds of tasks, in which the complexity of human information processing was different, were applied in this experiment. The results obtained were as follows:
(1) The curve of the error ratio revealed that the upper limitation of short-term memory, that subjects could deal with, existed in each task, and that the upper limitation decreased as the complexity in human information processing of the task increased.
(2) As to the findings on a physiological parameter related to heart rate variability, the quantity of short term memory, in which the physiological load was comparatively less, existed under the upper limitation, and the quantity decreased as the complexity in human information processing of the task increased. In the experiment of this study, the quantity decreased from 5 to 4 to 2 chunks as the complexity increased.
These results suggest that a proper quantity of information presentation does not take a specific value, but decreases as the complexity in human information processing of the task increases.View full abstractDownload PDF (965K) -
Masako DOHI, Akira TAKAHASHI, Mieko KOIKE1994 Volume 30 Issue 2 Pages 71-83
Published: April 15, 1994
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSSomatological measurements of the feet on 208 infants, little boys and girls from 1 to 6 years old, were made to secure the fundamental data for the design of their shoes. The results are as follows.
(1) Morphological characteristics of the feet in infants, little boys and girls showed a tendency to change with acquirement and completion of ambulation.
(2) Measurements of foot could be classified as follow by the dendrogram of cluster analysis. (1) length group: correlated strongly with stature. (2) girth and foot width group: correlated with weight. (3) height group, heel and instep width: have nothing to do with other measurements (independent).
(3) The velocity of growth differs with the regions of a foot. Medial margins of soles turn into S-form and fan-shape by adding their year. Moreover, configulations of the frontal sections change into flat at the measuring point of foot width and become higher at the measuring point of instep girth.
(4) The differences in form of the feet are remarkable at the antero-lateral portion of the feet. On the contrary, the form at the heel changes less than others. And the average of ball height remains unchanged in 28.3∼30.2mm and have nothing to do with aging and the shoes sizes.View full abstractDownload PDF (8405K) -
Relating to continuous working time and rest pause for VDT workIsao YOSHIMURA, Yasuyuki TOMODA1994 Volume 30 Issue 2 Pages 85-97
Published: April 15, 1994
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSSynthesizing the three sides—the changes of physiological function expressed by standard score, operation capacities, and subjective symptoms—as the way of the fatigue estimation in the industrial work is considered to be effective in the time and judgement of the appearance of fatigue.
The purpose in this paper is inspecting the preceding way and judging the optimal working time and the rest pause on the basis of the connection between the continuous working time and the rest pause. There are totally 6 combinations between the continuous working time (60 minutes or 50 minutes or 40 minutes) and the rest pause (10 minutes or 20 minutes) in this experiment.
As the result, the changes of the three sides—physiological function, operation capacities, and subjective symptoms—showed a tendency answering well to the differences between the continuous working time and the rest pause in each combinations. Furthermore, in the case that continuous working time is 50 minutes and the rest pause is 20 minutes, this experiment show a best tendency and was found to be an effective way for the fatigue estimation and the inspectation of the condition of the optimal working.View full abstractDownload PDF (3266K) -
Kazuyo IWAMOTO, Taro MAEDA, Kazuo TANIE1994 Volume 30 Issue 2 Pages 99-109
Published: April 15, 1994
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSCurrentry, there are several types of Head Mounted Display (HMD) commercially available for virtual reality systems. The HMD uses two LCD displays to present the different image to each eye and enables a user to see stereo images. In order to display realistic images, the HMD is required to have the enough size screen which covers the whole visual field. In almost HMDs, however, the size of screen is not enough large because the use of the wider one will make the image resolution lower. As long as the NTSC display is introduced, there is a difficulty of overcoming this problem because of the restriction of the scanning lines. One of solutions for this is to introduce the Eye Movement Tracking Type HMD (EMT-HMD). Human eye can see the object precisely only at the area near to view point. With this in mind, the idea of EMT-HMD has been proposed which presents higher resolution images at the area near view point rather than the peripheral area. This paper describes the characteristics of human central vision useful to design such an image display system for EMT-HMD. In experiments, several grating Images with higher spatial frequencies at view point area were used. The images which have the various frequencies at the central and peripheral area, were presented to several subjects. Each subject was asked if he/she could recognize the difference of the resolution and required to answer the size of the high spatial frequency area at which the difference can not be recognized. From these experiments, the size of high resolution area was determined as a function of the difference of resolution. Based on these results, how to design the size of the high resolution area in EMT-HMD using NTSC display devices was provided.View full abstractDownload PDF (6617K) -
Yoshinori HORIE1994 Volume 30 Issue 2 Pages 111-113
Published: April 15, 1994
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (2787K)
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