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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 27, Issue 4 - Nov 2008
Volume 27, Issue 3 - Sep 2008
Volume 27, Issue 2 - Jun 2008
Volume 27, Issue 1 - Mar 2008
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Research of Grip Forces and Subjective Preferences for Various Individual Finger Grip Spans by using an
Kim, Dae-Min ; Kong, Yong-Ku ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 1~6
DOI : 10.5143/JESK.2008.27.3.001
Individual finger/total grip forces, and subjective preferences for various individual finger grip spans (i.e., four fingers had identical grip spans or different grip spans) were evaluated by using an "Adjustable Multi-Finger Force Measurement (MFFM) System". In this study, three grip spans were defined as follows: a 'favorite grip span' which is the span with the highest subjective preference; a 'maximum grip span' which is the span with the highest total grip force; a 'maximum finger grip span' which is a set of four grip spans that had maximum finger grip forces associated with the index, middle, ring, and little fingers, respectively. Ten males were recruited from university population for this study. In experiment I, each participant tested the maximum grip force with five grip spans (45 to 65mm) to investigate grip forces and subjective preferences for three types of grip spans. Results showed that subjective preferences for grip spans were not coincidence with the performance of total grip forces. It was noted that the 'favorite grip span' represented the lowest total grip force, whereas the 'maximum finger grip span' showed the lowest subjective preferences. The individual finger forces and the average percentage contribution to the total finger force were also investigated in this study. The findings of this study might be valuable information for designing ergonomics hand-tools to reduce finger/hand stress as well as to improve tool users' preferences and performance.
A New Computer Keyboard Design for Korean Alphabets with Frequency and Standard Considerations
Kim, Kuk ; Yoo, Young-Kwan ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 7~14
DOI : 10.5143/JESK.2008.27.3.007
In this study, four alternatives for the arrangement of Korean alphabets on computer keyboards are developed and analyzed to find the better design than the KS(Korean Standard) keyboard. Among the developed four modified models MOD 1 to MOD4, we suggest MOD3 as the best design which incorporates the keys usage frequencies and the compatibility of present standard.
The Effect of Noise and Background Music on the Trunk Muscle Fatigue during Dynamic Lifting and Lowering Tasks
Kim, Jung-Yong ; Shin, Hyun-Joo ; Lee, In-Jae ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 15~22
DOI : 10.5143/JESK.2008.27.3.015
The purpose of this study was to define the effects of noise and background music on the trunk muscle fatigue during dynamic lifting and lowering tasks. Six healthy male subjects with no prior history of low back disorders participated in this study. The participants were exposed to two levels of background noise such as 40dB noise and 90dB noise and three levels of background music such as no music, slow music, and fast music. Six different combinations of background noise and background music were played while the participants were performing the lifting task at 15% level of Maximum Voluntary Contraction. Electromyography signals from six muscles were collected and fatigue levels were analyzed quantitatively. In results, the 90dB noise increased trunk muscle fatigue and slowed down the recovery. The trunk muscle fatigue was the lowest when the fast music was played for as background. After recovery, the 90dB noise increased trunk muscle fatigue. The trunk muscle fatigue was the lowest when the slow music was played for as background. The results can be useful to manage the cumulative fatigue of trunk muscles due to background noise and music during repetitive lifting and lowering tasks in industry.
Analysis of Tendency and the Method Improving Ingress and Egress for Wheelchair Users
Cho, Sung-Il ; Park, Sung-Joon ; Hong, Seung-Woo ; Choe, Jae-Ho ; Jung, Eui-Seung ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 23~32
DOI : 10.5143/JESK.2008.27.3.023
This study attempts to develop improved ingress and egress in vehicle for disabled wheelchair people who driving is available, after investigating the ingress and egress relation demand and the inconvenient factor in the vehicle. An experiment was performed for that disabled wheelchair people to analyze the characteristics of ingress and egress relation operation through the questionnaire survey and the camera photographing. The results suggest various improvements possibilities in inside handlebar as a main factor. Through analysis of disabled wheelchair person's ingress and egress tendency, the alternative shape and position of inside handlebar are suggested. Also, this paper aimed to draw ingress and egress improvement proposal by executing a verification experiment and collecting the preferences from disabled people.
The Effect of Wearable Wrist Rest During Keyboard and Mouse Use
Park, Kyung-Soo ; Park, Kang-Hyo ; Hong, Gi-Beom ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 33~41
DOI : 10.5143/JESK.2008.27.3.033
The goal of this study was to compare wrist posture, muscular loads and perceived comfort among wearable wrist rest (WR), general wrist rest(GR), no wrist rest(NR) during keyboard and mouse use. Thirteen subjects performed text editing task in three test conditions: wearable wrist rest(WR), general wrist rest(GR), no wrist rest(NR). During text editing task, the right wrist posture was recorded by an electrogoniometer and the muscle activity in upper trapezius, anterior deltoid, extensor digitorum, extensor carpi ulnaris were recorded by electromyography. After all of the tests, the subjects rated perceived comfort. Working with wearable wrist rest(WR), compared to no wrist rest(NR) and general wrist rest(GR), decreased wrist radial/ulnar deviation and also decreased muscle activity in upper trapezius and anterior deltoid. At the same time, in work with wearable wrist rest(WR), the subjects rated more comfort at 5 of 8 body locations(shoulder, upper arm, wrist, hand, body).
A Framework for Computerized Human Error Analysis System - Focused on the Railway Industry
Shin, Min-Ju ; Baek, Dong-Hyun ; Kim, Dong-San ; Yoon, Wan-Chul ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 43~52
DOI : 10.5143/JESK.2008.27.3.043
Human errors are now considered as the most significant source of accidents or incidents in large-scale systems such as aircraft, vessels, railway, and nuclear power plants. As 61% of the train accidents in Korea railway involving collisions, derailments and fires were caused by human errors, there is a strong need for a systematic research that can help to prevent human errors. Although domestic railway operating companies use a variety of methods for analyzing human errors, there is much room for improvement. Especially, because most of them are based on written papers, there is a definite need for a well-developed computerized system supporting human error analyzing tasks. The purpose of this study is to propose a framework for a computerized human error analysis system focused on the railway industry on the basis of human error analysis mechanism. The proposed framework consists of human error analysis (HEA) module, similar accident tracking (SAT) module, cause factor recommendation (CFR) module, cause factor management (CFM) module, and statistics (ST) module.
Comparison of Task Assessment Results between Work Sampling Scenes and Extreme Task Scenes
Shin, Chung-Kyu ; Jeong, Byung-Yong ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 53~60
DOI : 10.5143/JESK.2008.27.3.053
The work-related musculoskeletal disorders have constantly increased since it became an issue in 1996. In 2002, the Government established the risk factors analysis system in order to prevent musculoskeletal disorders. The proclamation by the Ministry of Labor defined eleven spheres of work associated with musculoskeletal disorders. As a result, business proprietors, who have workers engaged in tasks associated with musculoskeletal disorders, are required to conduct the risk factor analysis on a regular basis every three years. However, numerous issues have been raised while carrying out the risk factor analysis in various industries. One of the issues is that even though work sampling is an ideal method in risk factor analysis, most cases have selected extreme task postures, which is judged by an expert, due to limited time. This study will propose the desired direction of the risk factor analysis by comparing task assessment results between work sampling scenes and extreme task scenes.
Sensibility Evaluation of Function Sounds on Mobile Phones
Kim, Jae-Kuk ; Cho, Am ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 61~69
DOI : 10.5143/JESK.2008.27.3.061
The purpose of this study was to examine the effects of sensibility and compatibility from function sounds of mobile phones. For this purpose, the present study extracted sensibility adjectives and carried out sensibility evaluation to identify the sensibility factors in the function sounds of mobile phones. And 65 sound sources out of six categories were investigated for 27 subjects. The result showed that two dominant sensibility factors were the duration and the melody pattern of the sound sources. The compatibilities of opening and closing sounds were evaluated lowly with short duration and quick tempo. Especially, the most of the subjects preferred more attractive and longer opening sounds than other function sounds. Another finding was that the short sounds with melodies were preferred for cancellations and alerts, unliked the commonly used sound sources in industry and other traditional electronic products.
A Study on the Effect of Arch Support for Improvement of Muscle Activity
Lee, Chang-Min ; Kim, Jin-Hoon ; Oh, Yeon-Ju ; Kim, Dae-Woong ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 71~79
DOI : 10.5143/JESK.2008.27.3.071
Walking shoes for walking and jogging have been used to enjoy lots of leisure time. Functional shoes such as walking shoes have special functions to improve body motility by changing of shoe shapes. The walking shoes could improve the motility by structural transformation of outsole as increase degrees of heel and toe. The study on insoles has not been conducted enough on the contrary of the study of outsole. The purpose of this study is to perform ergonomics analysis whether the Arch Supported insoles have an improving effect of muscle activities or not. Experiments were performed with 6 subjects who are health and haven't experienced any diseases past. EMG(Electromyography) and Foot Pressures were measured repeatedly for 5 seconds at 0 hour, after 1 hour and after 2 hours of walking. Insoles used for experiment are normal insole, insole inserted Arch Support and pad. The electrodes for EMG measurement were set on waist (erector spinae), and thigh (vastus lateralis), calf (gastrocnemius). Evaluations of EMG were analyzed by shift of MF (Median Frequency) and MPF (Mean Power Frequency). Foot Pressure was analyzed by mean pressure of feet and change of walking time. As results, Arch Support insole had larger frequency shift value than that of normal insole. Frequency shift between Arch Support insoles and normal insole showed significant difference on 95% confidence interval. And insole 1 has the highest value of frequency shift. For results of foot pressure, Arch Support insoles show continuous decreasing tendency when comparing with normal insoles by changing of times. Also, insole 1 has the highest decreasing value of foot pressure. Therefore, this study presented that the Arch Support insole can promote muscle activities and improves comfort for a prolonged walking.
Musculoskeletal Disorder Symptom Features and Control Strategies in Hospital Workers
Park, Jung-Keun ; Kim, Day-Sung ; Seo, Kyung-Beom ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 81~92
DOI : 10.5143/JESK.2008.27.3.081
Musculoskeletal disorder (MSD) problems have been increasingly reported in hospital sector but the problems were not addressed with respect to holistic aspects of the target population in Korea. Often, it is required to understand how MSD symptoms are associated with factors such as personal, work environmental and psychosocial stressors. To examine features of association between sets of MSD symptoms and the factors, a questionnaire survey was conducted in a university hospital. A 140-item questionnaire was developed and used for collecting information including factors (e.g., job/occupation, task/activity, job stress) and MSD symptoms. A total of 1,091 workers (male 23.7% and female 76.3%) were finally determined for data analyses. Prevalence rate for the whole body was 72% and, among body parts, the highest was 48.7% for the shoulder, followed by 34.6%(the low back), 32.7%(the leg/foot), 27.9%(the neck), 26.7%(the wrist) and 12%(the elbow). The symptoms were significantly different by job/occupational variable in each of all body parts except the neck. The symptoms were very significantly different by task/activity variables in each of all body parts while those symptoms were significantly different by psychosocial variables, depending on body part and gender. In the logistic regression analyses performed for MSD symptoms by body part and each of 3 factors, odds ratio values varied, ranging from 0.7 to 3.3. The controls for reducing the symptoms were discussed on the basis of the findings. The results show that the MSD symptoms can remarkably vary by the factors and, in particular, can be highly differential for the task/activity factor. This study suggests that MSD symptom features be examined by using various factors and then a higher differential factor be primarily utilized for controling MSD symptoms in general industry including hospital settings.
The Effect of a Wedged Rocker Sole on Ankle Joints during Gait
Kwon, Sung-Hyuk ; Kim, Choong-Sik ; Kim, Hee-Jin ; Ryu, Tae-Beum ; Chung, Min-Geun ;
Journal of the Ergonomics Society of Korea, volume 27, issue 3, 2008, Pages 93~101
DOI : 10.5143/JESK.2008.27.3.093
Wedged soles and rocker soles are widespread shoe designs used to prevent the disorders and reduce the pain of the lower extremity caused by arthritis or diabetic feet. In this study, the effect of a shoe with a laterally wedged sole and a rocker sole simultaneously was analyzed on the kinematics and kinetics of the ankle joint during normal walking. Eight male participants without a history of lower extremity disorders were recruited. Each participant performed twenty walking cycles for each of three walking conditions: bare foot, wearing normal shoes and wearing shoes with laterally wedged rocker soles. The differences between the three walking conditions were statistically investigated including spatio-temporal variables, angular displacements, joint moments and ground reaction forces. The results showed that the laterally wedged rocker sole decreased the sagittal variation of angular displacements as well as the frontal/sagittal average moment on the ankle joints compared to the flat sole. In addition, the rate of angular displacements and loading decreased during the heel contact phase.