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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Ergonomics Society of Korea
Journal Basic Information
Journal DOI :
The Ergonomics Society of Korea
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Volume & Issues
Volume 29, Issue 6 - Dec 2010
Volume 29, Issue 5 - Oct 2010
Volume 29, Issue 4 - Aug 2010
Volume 29, Issue 3 - Jun 2010
Volume 29, Issue 2 - Apr 2010
Volume 29, Issue 1 - Feb 2010
Selecting the target year
A Review Study for Grip Strengths of Hand
Kong, Yong-Ku ; Sohn, Seong-Tae ; Han, Jun-Goo ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 715~725
DOI : 10.5143/JESK.2010.29.5.715
Many researches for grip strengths, using diverse ways such as subject, equipment, posture, method, has been conducted to investigate the differences of grip performance of dominant hand and non-dominant hand. It is hard to conclude, however, with one single or simple answer for this question based on researches due to various findings. Although `the 10% rule` which is the dominant hand may produces a 10% greater grip strength than the non-dominant hand was often mentioned for this issue, there is still lack of supports for utilizing to general cases. This manuscript provides an overall review on the 53 research papers which were measured grip strengths of dominant as well as non-dominant hand in various conditions. According to this review study, many research findings reported that overall the grip strength differences between dominant and non-dominant hands were 6~10%, regardless of gender and age, followed by 0~5%, 11~15%, and over 16%. More detail information for grip strengths in both hands for gender and age groups were also presented in this study.
Resting Hand and Wrist Posture Evaluation
Lee, Kyung-Sun ; Jung, Myung-Chul ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 727~734
DOI : 10.5143/JESK.2010.29.5.727
The objective of this study was to evaluate the resting postures of the fingers and wrist based on the biomechanical model in term of hand posture (neutral, pronation, and supination) and gender (male and female). The finger and wrist joint angles were measured with VICON motion system. The EMG system was used to examine the muscle activity in the resting condition. The participants consisted of twenty male and twenty female students. The angles of the fingers and wrist were analyzed by means of the coordinate system associated with the International Society of Biomechanics. Hand posture was significant for all the joints. The finger and wrist joint flexed in supination more than in neutral and pronation. The hand posture and gender were not significant for the results of muscle activity, but it had larger muscle activities in supination more than in neutral and pronation.
Study on Evaluation Method of Driver`s Cognitive Workload with using In-Vehicle Information Systems
Jeon, Yong-Wook ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 735~739
DOI : 10.5143/JESK.2010.29.5.735
Driving workload is increasing according to developing new in-vehicle devices and introducing driving information systems. In this research using a driving simulator, EFRP (Eye Fixation Related Potential) was measured for evaluating driving attention and distraction while tasking cognitive workload, n-back tasks. The result of EFRP was compared with driver behaviors. Results suggest that EFRP is able to use for a method of evaluating driving workload, however, the analysis of driver behavior is difficult to find driving attention and distraction in the case of free flow of traffic situation.
A Study on Applicability of EEG Spectral Relative Power as a Measure of Expertise Level
Ok, Dong-Min ; Park, Hee-Sok ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 741~750
DOI : 10.5143/JESK.2010.29.5.741
The objective of this paper is to study if the EEG spectral relative power would be a reasonable measure of expertise level. EEG electrodes were placed on the locations of Fp1, Fp2, F3, F4, T3, T4, O1, O2 while 5 subjects were playing 4 kinds of game on PC. EEG spectral relative power was significantly related with expertise level on the locations of Fp1, T3, T4, O1, O2. And the results showed that the
activities were decreased, while
activities were increased. The results indicated that the EEG spectral relative power would be applicable as a quantitative measure of expertise level.
A Study on Job Stress of Aircraft Composite Material Part Manufacturing Workers
Yoon, Hoon-Yong ; Lee, Choon-Jae ; Jang, Jun-Hyuk ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 751~762
DOI : 10.5143/JESK.2010.29.5.751
The purpose of this study was to investigate the job stress factors of aircraft composite material part manufacturing workers using survey based on `Job stress factors evaluation tool for Koreans` that was developed by KOSHA in 2003. Two hundred and fifty workers participated in this study, and among them 204 responses were analyzed for this study due to the unreliability and insincerity of responses. The eight job stress factors which are physical environment, job autonomy, job insecurity, organizational system, workplace culture, unfair compensation, relationship conflict, and job requirement were analyzed. The results showed that the stress level of the six job stress factors which are physical environment, job autonomy, job insecurity, organizational system, workplace culture, unfair compensation was relatively higher than that of other industry workers. Generally, all eight job stress factors showed higher stress with temporary workers than with permanent workers, and especially job autonomy, job insecurity, organizational system, and unfair compensation factors showed statistically significant differences (p<0.05). Since the temporary workers are insecure with their job, weak position in organization, having little self-control for the job and lower pay level than that of permanent workers though the job is as same as permanent workers`, the stress level of above job stress factors would be much higher than that of the other factors. The group of unsatisfactory with workplace showed higher job stress than group of satisfactory with workplace in all job stress factors, as expected, at the statistically significance level (p<0.05). From the results of this study, the work loss due to the job stress could be prevented, and accurate stress factors could be removed at the workplace. Also the job stress management program can be implemented to improve the work efficiency and the workers` quality of life.
Usability Test of Interface for Web Widget Using Work-Flow based on Mouse Tracking
Han, Mi-Ran ; Park, Peom ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 763~770
DOI : 10.5143/JESK.2010.29.5.763
The use of web widgets on desktop and mobile devices has been increasing rapidly. Web widgets provide access to activities and information from various sources across the web. As the number of supported widgets increases, managing widgets and finding relevant or interesting widgets becomes more complex. In addition, interacting with widgets in web service systems can be difficult, especially for novice users. Up to this point, there has been little research on web widget usability. This paper performs an experimental study regarding user interfaces of web widgets based on the mouse tracking and work-flow analysis. In the experiment, four sites providing widget services are chosen - iGoogle, Netvibes, My yahoo, and Wizard. The experiment participants perform three assigned tasks in the chosen sites, and their mouse operations are recorded using Camtasia, a screen casting software. Mouse tracking analysis is performed based on the recorded data in order to analyze common user behaviors. In addition, work-flow diagrams representing the operational flows to carry out the given tasks in each web site are constructed so as to visually and systematically analyze detailed usage patterns. The experimental study results presented in this paper can contribute to developing guidelines for highly usable and accessible interface design of web widgets.
Ergonomic Designs of Car Navigation for Elderly Users
Kim, Chang-Kyoon ; Choe, Jae-Ho ; Im, Young-Jae ; Jung, Eui-S. ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 771~782
DOI : 10.5143/JESK.2010.29.5.771
The CNS Responses of Elderly Driver due to Signal Types at the Intersection: Focused on Yellow Interval Dilemma Situation
Lee, Young-Chang ; Kim, Bo-Seong ; Kim, Hyun-Woo ; Lim, Dong-Hoon ; Bak, Mi-Seon ; Min, Byung-Chan ; Min, Yoon-Ki ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 783~788
DOI : 10.5143/JESK.2010.29.5.783
This study was to examine to the CNS(Central Nervous System) responses of elderly drivers at the green, yellow, and red signal types. To examine this result, the older adults over age 65 who has more than 5 years of driving experience participated this experiment. In addition, we used audio-visual film clips as the stimulus than driving simulator, because the CNS reponses are sensitive to movement such as steering wheel. While subjects were watching one car`s driving among green, yellow, or red signal types at the intersection, we measured their EEG(electroencephalogram) using monopolar electrodes from Fz, Cz and Pz sites. As a result, relative sizes of beta waves were changed due to the signal type conditions, and pre- and post-time of entering the intersection at the measured sites, separately. It suggests that the elderly drivers` CNS responses were different by the signal types.
Effect of Shoe Heel Height on Standing Balance and Muscle Activation of Ankle Joint
Oh, Duck-Won ; Chon, Seung-Chul ; Shim, Jae-Hun ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 789~795
DOI : 10.5143/JESK.2010.29.5.789
This study aimed to investigate the effect of differing heel height on static balance and muscle activation of ankle joint during standing. Twenty-one young females volunteered to participate in this study. To measure balance function and EMG activity of tibialis anterior and gastrocnemius muscles, the subjects were asked to perform 1-min standing with eyes open and closed state under 3 different heel heights: barefoot, 3cm, and 7cm each. During the standing, postural sway distance and area, and EMG activity of tibialis anterior and gastrocnemius muscles were significantly augmented with increasing heel height (p<0.05). For comparison between eyes open and closed in terms of postural sway area and EMG activity of tibialis anterior muscle, barefoot and 7cm height conditions respectively showed significant differences as well. The findings indicate that high-heeled shoes may have disadvantages in maintaining balance function because of extra-muscular effort of ankle joint. This study provides useful information that will inform future studies on how heel height affects muscle activity around the ankle joint in aspects of static and dynamic balance.
Investigation of Perceived Discomforts and Suggestion of a Procedure for the Universal Design of Housing
Kim, Chung-Sik ; Lee, Dong-Hun ; Kim, Hee-Jin ; Chung, Min-K. ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 797~810
DOI : 10.5143/JESK.2010.29.5.797
This study examined perceived discomforts encountered in residential facilities such as individual houses and apartments, and suggested a procedure for improving the problems in the living residence. The participants consisted of two groups of people: normal and underprivileged people; the underprivileged group was classified into 3 sub-groups: elderly people (over 65 years old), handicapped people and pregnant women. To identify inconvenient places and design factors in the residential housing, a total of 200 subjects (50 for each group) participated in the survey using the 7-point Likert scale. As a result, all the user groups mainly answered a high degree of discomfort due to narrow parking places, doorsills, and height differences between floors. The elderly, the handicapped, and the pregnant women replied that it is uncomfortable to use ramps and utility rooms. In a follow-up study, one-to-one in-depth interviews were conducted with some of the participants to analyze the detailed causes of inconvenient places and design factors. This study also suggested the procedure for solving the problems in various design factors from perspective of universal design, by considering prior studies which focused on a certain user group like the elderly. This procedure was suggested to consider as many user groups as possible at the same time. The results can be used to understand the discomforts of various user groups on residential housing. The procedure can also be used to develop universal design guidelines for the living residence.
Development of a Self-Administered Checklist for Evaluation of the Musculoskeletal Disorders Risk Factors in Construction Industry
Lee, Yun-Keun ; Park, Hee-Sok ; Park, Jung-Keun ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 811~818
DOI : 10.5143/JESK.2010.29.5.811
In this study, a self-administered checklist for evaluation of the musculoskeletal disorders risk factors in construction industry was developed, and its reliability and validity were studied. 10 items of the checklist were determined based on the literature review, and total 2,793 construction workers participated in the analysis of the checklist`s applicability. The results from the reliability analysis showed high Cohen`s kappa coefficient (0.50~0.77), and high validity was also obtained in terms of relative risk (RR 1.73~9.14). Positive predictability was relatively low (13.0~32.5%), while negative predictability was high (80.1~96.8%). It can be concluded that the checklist would be suitable as a quick filtering tool of the ergonomic risk factors.
Literature Review on One.Handed Manual Material Handling
Mo, Seung-Min ; Kwag, Jong-Seon ; Jung, Myung-Chul ;
Journal of the Ergonomics Society of Korea, volume 29, issue 5, 2010, Pages 819~829
DOI : 10.5143/JESK.2010.29.5.819
By referring thirty-seven previous studies on manual material handling (MMH), this paper analyzed guidelines and main factors of one-handed tasks. The previous studies concerned main factors of distance, weight, frequency, posture, gender, age, training, direction of force, height of the force exerted, and object shape and size. Based on these factors, the criteria used to understand one-handed tasks were objective measures of maximum strength, reaction force, etc., psychophysical measures of maximum acceptable frequency and weight, etc., and physiological measures of oxygen uptake, heart rate, electromyography, etc. An allowance threshold model regarding quantitative and objective fatigue and workload would be suggested for future research. This study would be expected that it serve to establish and Korean recommendations of one-handed tasks.