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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 28, Issue 4 - Nov 2009
Volume 28, Issue 3 - Aug 2009
Volume 28, Issue 2 - May 2009
Volume 28, Issue 1 - Feb 2009
Selecting the target year
Menu Structure Design using Asymmetric Spreading Activation in Mobile Phone
Oh, Se-Eung ; Myung, Ro-Hae ;
Journal of the Ergonomics Society of Korea, volume 28, issue 1, 2009, Pages 1~7
DOI : 10.5143/JESK.2009.28.1.001
As products are getting more diverse and new products are entering the market faster, customers have trouble learning how to use them. User-oriented menu structures may solve this problem. In order to design user-oriented menu structures, spreading activation theory has been studied. The spreading activation test shows that the strong associative relationship between words has shorter response times. Based on the spreading activation test, asymmetric spreading activation was introduced and a hypothesis that in a well-designed menu structure, association between upper-low menu pairs is not affected by an activation direction was tested for this study. In this study the menu of a cellular phone (Model: SPH-w2900) was extracted, and underwent 1st spreading activation tests. Then, on each menu pair, response time differences (asymmetric transition) by accuracy and directions were analyzed to find out problems in labels and improve menu structures and vocabulary. Second spreading activation tests were conducted to check whether asymmetric transitions decreased. The results showed that response time differences (asymmetric transition) for activation directions were found to be dropped significantly. Asymmetric transitions in spreading activation presented in this study will be helpful to define user-oriented menu structures.
Evaluation of the Effects of Lower-limb Postures on the Subjective Discomfort, Heart Rate and EMGs of Lower Extremity Muscles
Kong, Yong-Ku ; Kim, Dae-Min ; Lee, Soo-Jin ; Lee, Jae-Hoon ; Lee, Yong-Ho ; Lee, Kyung-Suk ; Sohn, Seong-Tae ;
Journal of the Ergonomics Society of Korea, volume 28, issue 1, 2009, Pages 9~19
DOI : 10.5143/JESK.2009.28.1.009
Repetitive movement, inadequate working posture, overuse of force, physical contact with sharp edge, vibration and temperature were well known risk factors of WMSDs (Work-related Musculoskeletal Disorders). Many researchers have investigated the relationship between inadequate working postures and incidences of WMSDs of the upper extremities, whereas relatively few researchers have tried to evaluate workload associated with the lower-body postures. The effects of lower-limb postures including various knee flexion angles on the subjective discomfort, heart rate and EMG of lower-limb muscles were investigated in this study. Thirty graduate students were asked to maintain thirteen different body postures, and heart rate and EMG data of five muscle groups (electro spine, biceps femoris, vastus medialis, gastrocnemius and tibialis anterior) from each posture were collected during fifteen minutes sustaining tasks. All participants were also asked to report their discomfort ratings of body parts. Results showed that high subjective discomfort ratings and heart rates were reported at the postures of knee angles of
, whereas low discomfort ratings were founded at the postures of chair heights with 20cm, 40cm, and sitting with crossed legged. The change of median frequency for each muscle group during fifteen minutes tasks was investigated for each body posture to evaluate the relationship between muscle fatigue and body posture. It was found that the trends of changes of median frequency were different based on muscle group as well as lower-limb body posture from this study.
A Study on Somatotype Classification of Muscular Men's Lower Body
Jeong, Hye-Jin ; Kim, So-Ra ;
Journal of the Ergonomics Society of Korea, volume 28, issue 1, 2009, Pages 21~27
DOI : 10.5143/JESK.2009.28.1.021
The purpose of this research is to understand the physiological characteristics of muscular men between the ages of 20 and 34 years who are distinct from the general population due to their muscular development, and to categorize them according to upper body somatotypes. This research was conducted in order to provide basic data necessary for developing clothing products for muscular men. The research method and results were as follows: 1. The study carried out factor analysis with the body measuring value of 168 muscular men according to the body classification method of Sheldon and Heath-Carter. The study materialized muscular men's lower body types statistically by carrying out cluster analysis, regarding scores of each factor extracted from the factor analysis as an independent variable. The study also carried out discriminant analysis with the results of cluster analysis classified so that morphological characters of each type were remarkably distinguished. 2. As the results of factor analysis, the study set up number of factors as three. Factor 1 occupied 38.149% of the total variables as a size factor of the lower body. Factor 2 occupied 20.417% of the total variables as a height and length factor of the lower body. Factor 3 occupied 8.466% of the total variables as a length factor of the hip. 3. The study classified the lower body type into three types and the characteristics by each type were as follows. Type 1 was a group with the best developed muscle in the lower of the body, considering that a size of their lower bodies was the largest. Type 2 was well-balanced muscular males though a size of the lower body was smaller than other types. This type didn't have fatness of the abdomen and large hips. Type 3 was a body type that the length from the waist to the hip was long. 4. As the results of carrying out discriminant analysis to distinguish muscular men's lower body types, the discriminant accuracy was 86.3% over all in the lower bodies.
Development of Preventive Management Manual for Non-Manufacturing Industries
Kim, Chol-Hong ; Moon, Myung-Kug ; Kim, Day-Sung ;
Journal of the Ergonomics Society of Korea, volume 28, issue 1, 2009, Pages 29~36
DOI : 10.5143/JESK.2009.28.1.029
A Study was conducted to investigate the type and level of occupational risk factors for the onset of work-related musculoskeletal disorders (WMSDs) in non-manufacturing industries. Total of 38 worksites were investigated from 5 different business areas such as financial institution, transportation service, building maintenance, sanitary service and educational service. Major job and task category were classified and corresponding occupational risk factors such as awkward posture, force exertion, repetitiveness of job, and work/rest cycle were examined using various ergonomic risk analysis techniques. Sets of matrices were developed including types and levels of risk factors for the classified jobs and tasks from 5 different non-manufacturing industries. Also possible ergonomic remedies were suggested for the improvement working conditions. Results and risk factor matrices can be applied as a guideline for the investigation of WMSDs risk factors in similar industries for the prevention of WMSDs.
Development of a Crew Resource Management Training Program for Reduction of Human Errors in APR-1400 Nuclear Power Plant
Kim, Sa-Kil ; Byun, Seong-Nam ; Lee, Dhong-Hoon ; Jeong, Choong-Heui ;
Journal of the Ergonomics Society of Korea, volume 28, issue 1, 2009, Pages 37~51
DOI : 10.5143/JESK.2009.28.1.037
The nuclear power industry in the world has recognized the importance of integrating non-technical and team skills training with the technical training given to its control room operators to reduce human errors since the Three Mile Island and Chernobyl accidents. The Nuclear power plant (NPP) industry in Korea has been also making efforts to reduce the human errors which largely have contributed to 120 nuclear reactor trips from the year 2001 to 2006. The Crew Resource Management (CRM) training was one of the efforts to reduce the human errors in the nuclear power industry. The CRM was developed as a response to new insights into the causes of aircraft accidents which followed from the introduction of flight recorders and cockpit voice recorders into modern jet aircraft. The CRM first became widely used in the commercial airline industry, but military aviation, shipboard crews, medical and surgical teams, offshore oil crews, and other high-consequence, high-risk, time-critical industry teams soon followed. This study aims to develop a CRM training program that helps to improve plant performance by reducing the number of reactor trips caused by the operators' errors in Korean NPP. The program is; firstly, based on the work we conducted to develop a human factors training from the applications to the Nuclear Power Plant; secondly, based on a number of guidelines from the current practicable literature; thirdly, focused on team skills, such as leadership, situational awareness, teamwork, and communication, which have been widely known to be critical for improving the operational performance and reducing human errors in Korean NPPs; lastly, similar to the event-based training approach that many researchers have applied in other domains: aircraft, medical operations, railroads, and offshore oilrigs. We conducted an experiment to test effectiveness of the CRM training program in a condition of simulated control room also. We found that the program made the operators' attitudes and behaviors be improved positively from the experimental results. The more implications of the finding were discussed further in detail.
Development Process of Mobile Phone PUI Design Guidelines
Lee, Kyung-Sun ; You, Hee-Cheon ; Kwon, O-Chae ; Jung, Myung-Chul ;
Journal of the Ergonomics Society of Korea, volume 28, issue 1, 2009, Pages 53~60
DOI : 10.5143/JESK.2009.28.1.053
The present study was intended to suggest a process of physical user interface (PUI) design guideline development, which was validated with mobile phones. The process consisted of five stages including component and dimension analysis, function and environment analysis, evaluation criterion generation, literature review, and design guideline development. The process was applied to develop 19 mobile phone PUI design guidelines by identifying 28 components, 9 dimensions, 51 functions, 7 environmental conditions, and 15 criteria. The systematic approach of the process would be useful for manufacturers to develop design guidelines in an efficient manner.