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Volume 33, Issue 1
Displaying 1-6 of 6 articles from this issue
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Tetsuya HASEGAWA, Masaharu KUMASHIRO1997 Volume 33 Issue 1 Pages 1-7
Published: February 15, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe relation between work load and rest pause is experimentally investigated in a data entry work with different types of rest pause. In the data entry work, subjects are asked to do multiplication of one-figure numbers and to feed the lower one column of their answers. The work consists of 60 minutes, either without a rest at all or with a rest pause allotted at 15, 30 or 45 minutes after commencement. The length of the rest pause is ten minutes. The ocular accommodation is not affected when the rest pause is provided.
The work performance is higher with the rest pause than without it. The rest pause is recommended to be introduced at an early stage and early introduction of a rest is more effective to enhance work performance than frequent allotment of rest time.View full abstractDownload PDF (3588K) -
Yusaku OKADA1997 Volume 33 Issue 1 Pages 9-19
Published: February 15, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn manual control to change over state of a system, there exists two distinct movements; a fast primary motion to an approximate location, which is called slewing, and a fine adjustment to the exact setting, that is adjusting. The purpose of this paper is to examin the manual control characteristics by input devices for slewing and for adjusting on control/display ratio.
At the result of experiments, it is obtained the following characteristics for slewing and for adjusting. To reduce the operational time for slewing, subjects utilize the minus input value. This operation decreases the effect of time contant. However, the input is so large that the subjects do not operate the minus input exactly, and the control quantity becomes unstable. Thus, large input should not be adopted for slewing.
In manual control by the device for adjusting, it is observed that small movement to make a setting and detailed adjustment are involved. In case of large input, the detailed adjustment become so hard. On the contrary, the smaller the input is, the longer the time for adjusting is.
It is proposed the combinations of input value, which the shorter operational time is expected, for slewing and for adjusting. At the verification experiment, it is observed that the operational time by the two devices is much shorter than by the one device with the optimal C/D ratio. Therfore, the efficiency of proposed value for the two input devices, and the validity of using the two input device in manual control to change over the state of a system is confirmed.View full abstractDownload PDF (4886K) -
Go YAMAGUCHI, Naoki YOSHIDA, Yutaka TOMITA, Satoshi HONDA1997 Volume 33 Issue 1 Pages 21-25
Published: February 15, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis study proposed an FES system with simple command input and the controller which enabled to control multijoint upper limb (shoulder, elbow and wrist) smoothly for the desired position in a horizontal plane. The controller consisted of a Lagrange model and a Neural Network model, and their parameters could be tuned in accordance with the muscle characteristics of the patients. The controller which consisted of a Lagrange model and Neural Network model was better than a Lagrange model or a Neural Network model alone. As the trajectory desired, the ramp trajectory, the sigmoid trajectory, the latter half sigmoid trajectory and the minimum jerk trajectory were investigated. Since the arm followed the sigmoid trajectory with minimal error, the sigmoid trajectory should be designed to require the best performance. This system could also open the hand of a subject (release), close it (grasp) and keep a weight during the movement of the arm, according to the patient's additional requirement.View full abstractDownload PDF (3264K) -
Koichi NISHIKAWA, Mitsuo NAGAMACHI1997 Volume 33 Issue 1 Pages 27-34
Published: February 15, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe purpose of this study is to analyze the structure of thermal sensations. We attempted to stimulate the senses of 69 human subjects through the use of original visual samples that we devised. Twenty-one sets of slides were prepared, each of which was composed of several scenes of a particular Japanese city and season. Immediately after each set of slides was projected, a series of questions was put to the subjects using the semantic differential method.
Factor analysis was applied to the answers obtained, and indicated that thermal sensation was composed of five common factors: “comfort” “hot/cold” “wet/dry” “seasons” and “wind speed”. In addition, we conducted experiments on 29 subjects in both the summer (Sept. '93) and winter (Feb. '94) to investigate whether these five basic thermal sensations deduced from visual stimuli differ depending on the season. As a result, we were able to form a framework of the same five basic thermal sensations for summer and winter. The first factor, referred to as “comfort”, could be further classified into four subordinate factors: “preferene” “relaxation” “tenderness” and “refreshment”.View full abstractDownload PDF (1046K) -
(Part. 1) The indispensable measurement items of the upper bodyHaruko MAKABE, Miyuki BEPPU1997 Volume 33 Issue 1 Pages 35-46
Published: February 15, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSFor the purpose of obtaining the basic system for the comfortable clothing design. 674 young women from 20 to 22 years of age were measured, and the basic waist pattern was drawn for each subject. After fitting this pattern to each subject's body, adjusted basic waist pattern was obtained. In this paper, the principal component analysis was applied to 21 measurements on the upper body and 27 measurements on the adjusted basic waist pattern. Both of them were obtained the results, the first four components were intepreted: 1. a size factor. 2. a shape factor. 3. a sholder and neck base factor. 4. a sholder figure factor.
In these circumstances, the indispensable measurement items of the upper body were Bust girth, Side neck point, bust point to waist anterior, Side neck point to waist posterior, Shoulder point, bust point to waist anterior, Shoulder point to waist posterior, Trunk line, side length, Neck base girth, Back neck base girth, Shoulder length, Anterior sholder point width, Anterior chest width, Posterior sholder point width, Posterior chest width, Shoulder slope. If these measurement items were taken into consideration in the basic waist pattern making and pattern grading, the comfortable clothing would be supplied.View full abstractDownload PDF (6711K) -
Mariko FUNADA, Satoki NINOMIYA, Kenji SUGINOME, Kazuyuki NAOI1997 Volume 33 Issue 1 Pages 47-56
Published: February 15, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe main goals of this report were to propose a method to obtain a single stimulated event-related potential (ERP), which is considered as one of indexes to evaluate mental stress objectively, and to discuss the effect of the method. The characters of the method were to be a kind of adaptive filter concerned with frequency and not to require preinformation about difference among individuals. The method was applied to the real electroencephalograms under a pattern recognition task. The method made possible to obtain dynamic changes of ERPs, and one of character of changes is ERPs traced a kind of spiral in a space constructed by three axes; amplitude, latency, and order of stimulus.View full abstractDownload PDF (1163K)
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