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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Ergonomics Society of Korea
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Journal DOI :
The Ergonomics Society of Korea
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Volume & Issues
Volume 14, Issue 2 - Aug 1995
Volume 14, Issue 1 - Apr 1995
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Neuromuscular difference between normal subjects and low-back pain patients: Neural excitation measured by dynamic electromyography
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 1~14
Neuromuscular difference between normal subjects and low-back pain patients has been identified in terms of neural excitation signal measured by Electromyography (EMG) under the dynamic flexion/extension trunk motion. Ten healthy subjects and ten low-back pain patients were recruited for this study. New parameters and normalization technique were introduced to quantify the muscle excitation pattern among the flexor-extensor pairs of muscles : rectus abdominis (RA)-erector spinae (ES at L1 and L5 level), external oblique (EO)-internal oblique (IO), rectus femoris (quadricep : QUD)-biceps femoris( hamstring : HAM), and tibialis anterior (TA)-gastrocnemius (GAS). Results indicated that the temporal EMG pattern such as peak timing difference between the hip flexor (QUD) and extensor (HAM) and the duration of coexcitation between ES at L5 and RA muscle pairs showed a statistically significant difference between normal subjects and low-back pain patients. Improtantly, this study presented a new technique to identify the dynamic muscle excitation pattern that canb be least affected by EMG-length-velocity relationship. Further study can performed to validate this method for clinical application to quantitatively identify the low-back pain patients in the future.
An ergonomic study on the car license plate in Korea
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 15~24
The purpose of this study is to provide ergonomic research data for the redesign of the car license plate in Korea. Several alternatives having various combinations of fonts, stroke-width ratios, color contrasts, and arrays were considered in order to find the best one in terms of the reading-distance and the misreading-rate. Experiments investigating the reading-distance, misreading-rates were conducted. In addition, the alternatives were tested in a real driving situation. The results can be summarized as follows : The typography having mixed type numeric forms with quasi-Gothic and NAMEL, stroke-width ratio of 1:7 .approx. 1: 8, the black on yellow contrast showed a good reading-distance. The array with Hangul(showing territorial office and use-sign) at the upper row and 6 mumbers ( showing car class-sign and serial number) at the lower row showed relatively low misreading-rate.
The change of pupil size after viewing three dimensional TV
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 25~32
The physiological change of eyes while viewing 3D TV was investigated. The change of pupil size was used as the measure of evaluation. The results are as follows : (1) The pupil size decreases after viewing 2D and 3D image and the the tendency is more critical with 3D images. (2) The indoor illumination has a significant effect on the pupil size in both 2D and 3D cases. (3) Less chage of pupil size were observed under the indoor illumination. Thus, if we only focus on the visual load on the eye, for viewing 3D image, it will be better to use indoor illumination.
A study of inverse kinematice using numerical methods
Oh, P.K. ; Kang, M.J. ; Han, C.G. ;
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 33~39
The inverse Kinematics can be used for representing the motion of human body model. In order to find the final figure of the human body model with given target position, we can uwe the formula x=J .THETA. , where J is the Jacobian matrix of x=f( .THETA.), of the Inverse Kinematics. In this formula, f has so complicated form that it is difficult to calcuate the Jacobian matrix J by expanding all formulae exactly. In this paper, a numerical method that calculates the Jacobian matrix is proosed. The simulation results obtained by using the simple human model reprsent that the proposed. The simulation results obtained by using the simple human model represent that the proposed method is useful for generating the final figure of the body model.
A study on preferred height and range of discomfort recognition for designing educational desks and chairs
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 41~50
A field study was conducted to assess the preferred height and the range of discomfort recognition of school desks and chairs for students from elementary school to high school. For this study 43 male subjects and 44 female subjects in Taejon metropolitan area were surveyed. The result showed that the preferred height of chairs were found to be about 1.7cm higher than the popliteal sitting height, while the preferred height of desks showed no significant difference with the elbow sitting height which is known to be the ergonomically proper desk height. The threshold value between comfort and discomfort recognition of chair heigth was 1.88cm below the most preferred height and 1.79cm above it. The threshold value between comfort and discomfort recognition of desk height was 1.76cm below the most preferred height and 2.62cm above it.
A study for apparel sizing system for women's ready-to-wear pants
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 51~61
The purpose of the study was to provide good fitting of ready-to-wear pants for adult women. To pursue this purpose, the anthropometric data of Korean in 1992 (ADaM(R) 1.0) were analyze. The subjects were 1,580 women aged from 18 to 50 years. The body measurements of six age groups were compared. The results of data analysis showed that the height measurements( waist height, trochanter height, glutial height, perinneum height) of the late 40's were about 3cm shorter than those of the early 20's. The waist circumference of old subject group was 14.1cm larger than those of the young subject group. With rapid growing of waist circumference, the difference of hip and waist circumference was getting smaller with aging. The average difference between hip and waist circumferences of young adult group (18 to 24 yrs) was 24.3cm (SD 3.6cm) and the meaurement of old adult group (45 to 50 yrs) was 15.0cm (SD 5.6cm). The size of the women's pants which were manufactured by the top 50 manufacturers in Korea were compared. The difference between hip circumference and waist circumference listed on the size tag ranged from 12cm to 32cm. The body measurements of subjects and the standard size categories for pants were compared. The results showed that larger size categorise needed to be added to give better fits for older adult group.
Criteria-based quantitative analysis of product usability
Park, K.S. ; C.H. Lim ;
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 63~73
An approach to quantitative evaluation of product usability during the design and implementation phases of the product life cycle is presented. The evaluation starts by defining a set of usability characteristics, viz. physical, cognitive and affective characteristic. Each of these characteristics is assessed by a set of usability criteria, such as functionality, visual clarity, learmability, etc. The usability criterion is then evaluated by a checklist consisting of a detailed questionnaire. The fuzzy weighted-checklist method with linguistic variables is used for quantitative analysis. Also, the method for quantifying usability improve- ments in iterative design processes is considered. This analysis procides a quantit- ative measure, which reflects the degree of excellence of product usability during the design and development phases.
A study on the development of the force-platform system for ground reaction force analysis
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 75~85
The purpose of this study is to develop a force-platform system suitable for real situations in industry. The developed system is a 3-axis measurement type. It consists of force-transmission, force measuring circuit, and the software that analyzes the measured force. The force-transmission transmits forces to 3 axes, which has a physical structure to minimize the interference among those axes. Force measuring circuit consists of DSP (digital signal processor) for flexible disposal of change of measurement algorithm, elimination of noise and maintenance of precision. The functions of the software are the calibration which revises the measurement error occuring during data acquisition, and various analyses of forces. The result of the experiment shows that the developed system has about 1% measurement error, is stable for repeated experiments, and is not effected by temperature change.
Investigation of postural sway characteristics of patients after total hip replacement
Journal of the Ergonomics Society of Korea, volume 14, issue 2, 1995, Pages 87~104
This research investigates the possibility of using the postural sway of patients as a reference for measruing the progress of the disease and healing of patients who received total hip replacement; the progress of the disease by X-ray pictures, the pain felt by the patients, and the difficulties encountered in moving the joints. The measurements on the force platform were taken during a 25 second period standing on both feet and during a 5 second period standing on one foot with both eyes open. The result of the research showed that the trace and area of the overall length of postural sway was a good indicator which represented the healing progress of the patients who received total hip replacement, and the weakening of the muscles and the recovery process for 3 or 4 month after receiving the operation, which did not appear on X-ray pictures, were exhibited on the postural sway. Finally, standing on a single foot represented the healing progress much better than standing on both feet.