Issues : JET is a peer-reviewed, open-access scientific journal : Journal of Ergonomic Technology (JET)

Journal of Ergonomic Technology (JET)
ISSN 2432-1575


A Study of the Color Features Related to the Feeling of “Han-nari” in Women’s Japanese Kimono
Publish Date : 2018/07/01  Vol.18
Authors : 
Kumiko Komizo, Graduate School of Science and Technology, Kyoto Institute of Technology
Satoshi Kitada, Faculty of Science and Technology, Kyoto Institute of Technology
Noriaki Kuwahara, Graduate School of Science and Technology, Kyoto Institute of Technology
Report Outline : 
Purpose: By using ten different types of kimono images, we investigated the physical quantities that constitute the feeling of “Han-nari”, a term used for expressing a certain kind of beauty specific to kimonos.

Participants and methods: Thirty students (22 males and 8 females) participated the experiment. Ten kimono images were shown on a screen, and the participants evaluated them based on their degree of “Han-nari”. The images were analyzed with RGB histograms and with u’,v’ chromaticity diagrams that were converted from RGB values. The brightness of the images was measured with brightness-meter.

Result: We found that the kimonos with “white” and “whitish yellow” colors strongly influenced the degree of “Han-nari” reported, and as the brightness of the kimono image increased, it showed a clear correlation with an increase in the reported degree of “Han-nari”.

Conclusions: Quantifying the feeling of “Han-nari” makes it possible to extract one factor of the beauty of kimono. Until now, the sense of “Han-nari” that a kimono might have depended entirely on the tacit knowledge of craftsmen. However, in order to clarify the definition of “Han-nari” by utilizing numerical values, kimonos that evoke a sense of “Han-nari” could be created by industrial production. This could eventually help to revive the kimono industry and is useful in passing kimono culture on to future generations. We were able to quantify the color and brightness associated with a sense of “Han-nari” in this research. This method is not limited to kimonos and could be applied to other industrial products.

Keywords: kansei, color, brightness, kimono; obi
Count : 488
Difference in response times on hand mental rotation task between the back
and palm of the hand in elderly individuals
Publish Date : 2017/12/28  Vol.17
Authors : 
Izumi Nagashima, Doctoral course, Graduate School of Health Sciences, Kyorin University, Department of Occupational Therapy, Faculty of Health Sciences, Kyorin University
Kotaro Takeda, Faculty of Rehabilitation, School of Health Sciences, Fujita Health University
Yutaka Sato, Graduate School of Technology, Industrial and Social Sciences, Tokushima University
Hideki Mochizuki, Department of Occupational Therapy, Faculty of Health Sciences, Kyorin University
Yusuke Harada, Department of Occupational Therapy, Faculty of Health Sciences, Kyorin University
Nobuaki Shimoda*, Department of Occupational Therapy, Faculty of Health Sciences, Kyorin University
Report Outline : 
Purpose: The hand mental rotation task (HMRT), in which participants judge whether a picture of a hand is of the left or right hand, is thought to induce a participant’s motor imagery. This application of this task in rehabilitation has begun. However, the task performance strategy used on presentation with a picture of the back of the hand and the palm in elderly individuals has not been sufficiently elucidated. In this study, we examined the performance strategy of the HMRT in response to pictures of the back of the hand and the palm among elderly individuals.
Participants and methods: A total of 75 right-handed individuals aged 65 years or older (38 men and 37 women, 74.9 ± 5.8 years old) were included in this study. From the position in which the middle finger was located at 0 degrees vertically, the pictures of the left/right hand and the back of the hand/the palm were turned in increments of 60 degrees in presentation, and the response time (RT) and correctness of responses were recorded. The RT to the left and right arrows was also measured, and the ΔRT was derived by subtracting the RT to the arrows from the RT to the hand pictures. A repeated measures ANOVA was conducted on the ΔRT with three factors: whether the hand was left or right, whether the back of the hand or the palm of the hand was pictured, and the presented angle.
Conclusions: We suggest that the motor imagery strategy was combined with the visual imagery strategy when pictures of the back of the hand were presented and that the motor imagery strategy was used when pictures of the palm were presented. These results indicate that frequent use of pictures of the palm may be effective when the HMRT is used for rehabilitation of elderly individuals.
Keywords: Motor imagery, Visual imagery, Aging, Rehabilitation, Motor response generation
Count : 1413
Pain related to breastfeeding in seated and side-lying positions: assessment and recommendations for improved guidance
Publish Date : 2017/10/24  Vol.17
Authors : 
Makiko AOKI, Kanagawa Institute of Technology
Satoshi SUZUKI, Kanagawa Institute of Technology
Hidenobu TAKAO, Kanagawa Institute of Technology
Fumitaka IKARASHI, Graduate School of Engineering, Kanagawa Institute of Technology
Report Outline : 
Purpose: To explore the relationship between breastfeeding positions and pain in the upper arms and shoulders.
Subjects and Methods: Twelve subjects with breastfeeding experience participated in an experiment and survey. In the experiment, subjects embraced two dummy infants with different weights, in six different positions, such as the cradle hold and side-lying hold, while electromyography (EMG) and video were recorded at six sites: the right and left forearms, upper arms, and shoulders. The survey asked for responses to 37 items such as sites where pain was felt during breastfeeding, type of hold during breastfeeding, and guidance received from medical institutions or other advisors.
Results: The 11 subjects who provided valid data were analysed. In training and practice with breastfeeding positions at medical institutions, only two subjects had received guidance on the side-lying hold, but 10 had used it. In terms of the positions of the upper arms in each hold, seven patterns were observed for the side-lying hold. Spearman’s rank correlation coefficient for left/right location of chronic pain and frequency of breastfeeding with the left/right breast was 0.95 (p<0.01). Eight of 10 subjects who had performed the side-lying hold felt short-term pain in the upper arm and shoulder of the breastfeeding side (the bottom side in the lateral decubitus position).
Conclusion: Of six breastfeeding positions, the one most frequently linked to pain was the side-lying hold. It also became clear that uneven breastfeeding with the right and left breasts in the side-lying hold, or the use of a self-taught side-lying hold position, produced short-term pain that was linked to lactation-stage pain. This shows that guidance on the proper use of the side-lying hold is needed. There is also a need for further investigation that distinguishes between different side-lying hold positions, to support teaching of appropriate body positions. Research on breastfeeding positions has the potential to reduce the burden of child-rearing on mothers and contribute to a healthier child-rearing environment.

Keywords: Breastfeeding positioning, EMG, Pains of upper arms and shoulder, Side-lying, After birth and parenting support
Count : 1668
Validity and reliability of Leap Motion Controller for assessing grasping and releasing finger movements
Publish Date : 2017/10/04  Vol.17
Authors : 
Shuntaro OKAZAKI, Faculty of Human Sciences, Waseda University, Saitama, Japan
Yoshihiro MURAOKA, Faculty of Human Sciences, Waseda University, Saitama, Japan
Risa SUZUKI, Faculty of Human Sciences, Waseda University, Saitama, Japan
Report Outline : 
Objective: The leap motion controller (LMC) is a motion sensor that has recently become available and has advantages in terms of cost, size, and accuracy. However, it has not been fully investigated whether the LMC has sufficient accuracy for clinical assessments, particularly finger flexion and extension, which are important for diagnosis and prognosis in stroke or cerebral palsy patients. Herein, we have tested the validity and reliability of the LMC for measuring the grasp and release of finger movements.
Materials and methods: A healthy participant repeated finger flexion and extension movements, and his fingertip position was measured using an LMC from the palmar, ulnar, and dorsal sides of the hand. The fingertip position was also measured using an electromagnetic motion tracker and a video. The finger movement detected by the LMC was compared with those detected by the other instruments.
Conclusions: The LMC had a higher reliability in detecting the fingertip position by sensing it from the palmar or dorsal side of the hand, compared with the ulnar side. In the palmar/dorsal side measurements, an underestimation in the amplitude of the finger movement was shown in the middle range of its excursion compared to video-detected movement. However, the underestimation resulted in a highly correlated, proportional bias, especially in the palmar-side measurement, and could be calibrated by a nonlinear regression analysis. The palmar side measurement was thus the most suitable for evaluating the finger flexion and extension. We concluded that by taking into consideration the range of excursion and appropriate calibration, the validity and reliability of the LMC is sufficient for the quantitative evaluation of finger flexion and extension in laboratory experiments and also in clinical settings.

Keywords: Motion capture; Spasticity; Grasping; Bland–Altman plot
Count : 1726
Ergonomic evaluation of mobile work type office environments
Publish Date : 2017/09/23  Vol.17
Authors : 
Satoru SAITO, Department of Arts and Science, Faculty of Fundamental Science Engineering, Waseda University
Hiroki KITAJIMA, Labor and Science Research Institute
Toshiki YAJIMA, Kokuyo Corporation Furniture Business Hadquarters
Junichi NINOMIYA, Inaba International Corporation
Kunihisa NAKAYAMA, YAMAGIWA Corporation
Sachiyo FURUSAKA, WFM Women's Facility Management/Fulliaison
Reiko MITSUYA, Science and Technology Research Institute, Waseda University
Report Outline : 
Purpose: In recent years, there have been changes in awareness and institutional systems relating to work due to factors such as innovation in IT technology and adoption of work-life balance. In particular, some companies have introduced a new mobile work-style where employees are able to work anytime, anywhere. The aims of this research were to ascertain the current situation based on an ergonomic survey of workers who work in the mobile work-style, and to identify problems, and propose solutions.
Experiment participants and method: Our aim was to ascertain the current situation in offices by measuring satisfaction in terms of factors such as the comfort, fatigue, and ease-of-use of equipment and office furniture for people working in all workplace environments, not just conventional fixed offices. To achieve this, we prepared and administered questionnaires to 115 employees at two private companies which are especially committed to using the mobile work-style.
Results: Chairs and desks are found to influence the satisfaction by Structural Equation Modeling. The present survey found that the effects due to lighting/furniture and the satisfaction of network environment remarkably influenced the workers' satisfaction.
Conclusion: The current status of workers working in the mobile work-style was ascertained using a survey questionnaire. As a result, two points became clear. First, the physical environment in a company has a major impact on satisfaction. Second, is the inadequate understanding and low level of concern for ergonomics among workers. As a solution for the first, the possibilities are: (1) Improvement of worker satisfaction through proper layout/design and furniture/fixtures, (2) Improvement of work efficiency, such as the ability to concentrate and ease of viewing monitor screens through proper lighting, and improvement in peace-of-mind such as a sense of ease or pleasantness, and (3) improvement of satisfaction by developing the network environment and improving factors such as stress due to no assigned seats. A reduction in stress in office environments can be expected by adopting, as a measure to resolve the above two issues, company-wide education in the need for and awareness of using adjustment methods for chairs and other furniture, and equipment which is suited to the body.

Keywords: Mobile work-style, Office, Satisfaction
Count : 756
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