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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
Editor in Chief :
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
Development Software to Select Boundary Manikins for Product Evaluation: Applied to an Automobile Case
Lim, Young-Jae ; Park, Sung-Joon ; Park, Woo-Jin ; Park, Jun-Soo ; Jung, Eui-S. ; Lim, Ik-Sung ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 831~841
DOI : 10.5143/JESK.2010.29.6.831
Usability evaluation of physical products involves characterizing complex physical interactions between humans and products. Human models known as manikins have been widely utilized as usability evaluation tools for automobile interior package design. When combined with computer-aided design software programs, such manikins can be used to simulate driving postures and evaluate driver-interior fits early in the design process, and therefore, may greatly facilitate achieving high-quality design in a cost-efficient manner. The purpose of this study was to define a set of manikins for designing automobile interior packages for the South Korean male population. These manikins were conceptualized as "boundary" manikins, which represent individuals lacking in certain physical capacities or having usability-related issues (e.g., an individual with the 5th percentile forward reach capability, an individual with the 95th percentile shoulder width). Such boundary manikins can serve as an efficient tool for determining if an automobile interior design accommodates the majority of the population. The boundary manikins were selected from the large sample of Korean males whose anthropometric dimensions were described in the recent Size Korea anthropometric database. For each male in the database, his comfortable driving posture was represented using a kinematic body linkage model and various physical capacity measured and usability-related characteristics relevant to driver accommodation were evaluated. For each such measure, a boundary manikin was selected among the Korean males. The manikins defined in this study are expected to serve as tools for ergonomic design of automobile interior packages. The manikin selection method developed in this study was implemented as a generic software program useful for various product design applications.
Development of a Usability Evaluation Structural Model on Car Driver
Park, Jun-Soo ; Park, Sung-Joon ; Lim, Young-Jae ; Jung, Eui-S. ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 843~851
DOI : 10.5143/JESK.2010.29.6.843
This study aims to systematically develop a usability evaluation model using the Structural Equation Model (SEM) from experiment of usability on using vehicle. Vehicle developers have been adding many functions for enhance the user satisfaction. But it will be made the trade-off problem of usability and design elements of vehicle interior from attempt to make best usability satisfaction in a restricted space. To solve the trade-off problem, we set a new solution criterion from usability evaluation model. The usability experiment is based on major activity pool from derived user's acts pattern in vehicle for make more accurate usability evaluation model. And this model was built with twenty-nine measurement variables for the evaluation of usability of vehicle user. As a result, the proposed SEM model showed statistical significance as well as a high level of R Square (0.7144). This model shows the relationships of detailed usability and design elements. According to the result, this study introduces the criterion to secure the best satisfaction of usability and design elements.
Effects of Three Levels of Flow Rate of Highly Concentrated Oxygen Administration on SpO
and HR of 60s Male and Female
Kim, Ji-Hye ; Choi, Mi-Hyun ; Lee, Su-Jeong ; Yang, Jae-Woong ; Jun, Jae-Hoon ; Min, Byung-Chan ; Lee, Tae-Soo ; Chung, Soon-Cheol ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 853~860
DOI : 10.5143/JESK.2010.29.6.853
This study investigated differences in blood oxygen saturation(
) and heart rate(HR) according to flow rate, gender, and phase in males and females in their 60s when the supply of 93% highly concentrated oxygen administration was changed (1L/min, 3L/min, and 5L/min). It recruited totally 20 elderly subjects including 10 males(
years) and 10 females (
years). The experiment consisted of three phages of Rest 1(5 min), Hyperoxia(10 min), and Rest 2(10 min), and
[%] and HR[bpm] were measured during all phages.
was higher in Hyperoxia phase supplied with highly concentrated oxygen than in Rest phases. Higher flow rate was associated with more increase in
. HR was reduced in Hyperoxia phase compared to Rest phases. More supply of highly concentrated oxygen was associated with more decrease of HR. However, there were no differences in both
and HR according to gender.
Extended Fitts' Law for Three-Dimensional Environment
Cha, Yeon-Joo ; Myung, Ro-Hae ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 861~868
DOI : 10.5143/JESK.2010.29.6.861
This study explored an extended three-dimensional Fitts' law that is more suited for the pointing task than the conventional Fitts' law. The experiments were conducted under the manipulation of the distance to the target, size of the target, and direction of the target's location that can be described by two angles,
. Considering the starting point as the center of coordinates,
is the angle between the positive z-axis and the target location and
is the angle between the positive y-axis and the projected target location on the x-y plane. From the experimental results, we confirmed that all four variables significantly affect the movement time. As we extended the index of difficulty of the conventional Fitts' model by incorporating
, we established an extended Fitts' model that showed better accordance with the empirical data than the conventional Fitts' model and 3D Fitts' law of Murata and Iwase, in terms of the
and the standard error of the residual between the measured movement time and the predicted value.
Analysis of Skin Conductance Level for Cognitional and Emotional Responses associated with Unexpected Situation during Driving
Lee, Su-Jeong ; Yang, Jae-Woong ; Kim, Ji-Hye ; Choi, Mi-Hyun ; Mun, Kyung-Ryoul ; Kim, Han-Soo ; Choi, Jin-Seung ; Ji, Doo-Hwan ; Min, Byung-Chan ; Tack, Gye-Rae ; Chung, Soon-Cheol ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 869~874
DOI : 10.5143/JESK.2010.29.6.869
The purpose of this study was to analyze the skin conductance level (SCL) induced by unexpected situation which reflected the emotional and cognitional responses during driving. The participants included 57 college graduates; 28 males aged
years of driving experiences and 29 females aged
years of driving experience. Reaction time of brake, averaged SCL, maximum SCL, and rising time to maximum amplitude were measured. They were analysed according to condition (crash, non-crash) and gender (male, female). The reaction time of brake was more faster and averaged SCL was greater during non-crash condition than during crash condition. There were no significant differences between male and female drivers in the reaction time of brake and averaged SCL whether or not it crash. There were no significant differences between crash and non-crash conditions in the maximum SCL and rising time to maximum amplitude, but there were significant differences between male and female in them. These results support the hypothesis that averaged SCL is more related to cognitional response and maximum SCL and rising time to maximum amplitude are more related to emotional responses.
The Effects of Alternating Set Pressure Changes on Dynamic Tissue Perfusion Characteristics
Won, Byeong-Hee ; Song, Chang-Seop ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 875~887
DOI : 10.5143/JESK.2010.29.6.875
The quantitative effectiveness of powered support surfaces such as APAM in preventing and treating pressure ulcers has not been sufficiently evaluated because of uncertainty of alternating pressure load input and lack of interpretation of dynamic perfusion characteristics of soft tissue. The aim was to verify the dynamic loading effects to sacral tissue perfusion characteristics from alternating set pressure changes. We developed integrated experiment system to supply alternating load to supinely positioned sacrum and concurrently measured
and air cell pressure. Ten aged subjects (5 female, 5 male) were tested with alternating set pressure 20, 30, 40, 50 and 60mmHg. From the dynamic perfusion response eight characteristic parameters were proposed such as average, minimum, maximum and perfusion range regarding to
. A one-way ANOVA was carried out to determine whether the manipulation of alternating set pressure had any effect on
. From the dynamic tissue perfusion response we found mean
decreased exponentially as alternating pressure load increased and perfusion range varied mainly because of minimum level change of
. And perfusion range of
affected by increase of maximum value of
. From the results we can get more strict insights about actual physiological dynamic tissue perfusion mechanism under alternating pressure load.
Effect of Craniocervical Flexion Exercise on Pain and Cross Sectional Area of Longus Colli Muscle in Workers with Chronic Neck Pain
Chon, Seung-Chul ; Chang, Ki-Yeon ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 889~895
DOI : 10.5143/JESK.2010.29.6.889
This study compared the effects of craniocervical flexion exercise with conservative cervical flexion exercise in workers with chronic neck pain. Subjects were randomly allocated to two groups: control (n=20) and experimental group (n=20), respectively. The conservative exercise for the control group consisted of cervical flexion exercise, whereas the experimental group performed a craniocervical flexion exercise. To compare the two groups, the visual analogue scale (VAS) for a pain, neck disability index (NDI) for a neck disability scale, and cross sectional area (CSA) of longus colli muscle using ultrasound image were assessed on pre-intervention, post-intervention, and 2 weeks follow-up. 2-way repeated ANOVA was used with Bonferroni post-hoc test. (1) There were significant main effects (within and between groups) (p<0.05) and interaction effect (p<0.05) in VAS. Post-hoc test revealed that there were significant differences in all pair-wise comparisons. (2) There were significant main effects (within and between groups) (p<0.05) and interaction effect (p<0.05) in NDI. Post-hoc test revealed that there were significant differences between pre-intervention and post-intervention, pre-intervention and 2 weeks follow-up. (3) There were significant main effects (within and between groups) (p<0.05) and interaction effect (p<0.05) in CSA of longus colli muscle. Post-hoc test revealed that there were significant differences in all pair-wise comparisons. The findings indicate that craniocervical flexion exercise are more effective for improving pain, neck disability, and CSA of longus colli muscle than cervical flexion exercise in workers with chronic neck pain.
Correlation Analysis between Safety and Health Indices in a Shipbuilding Industry
Pyo, Yeon ; Jeong, Byung-Yong ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 897~905
DOI : 10.5143/JESK.2010.29.6.897
The purpose of this study is to identify relationships between safety and health indices in a shipbuilding industry. From the results of periodical health examination, job stress test, and health questionnaire for musculoskeletal disorders, the author stratified the 704 shipbuilding workers into categories of smoking, drinking frequency, the amount of exercise per week, obesity, blood pressure, diabetic symptoms, liver function, audibility, job stress, fatigued condition, musculoskeletal symptom, and accident. The results show that occupational injuries are highly related to smoking, drinking frequency, auditory capacity, fatigued condition, and musculoskeletal symptoms. These results can be used to develop more effective accidental occupational injury prevention programs for shipbuilding industries.
Prediction of Menu selection on Touch-screen Using A Cognitive Architecture: ACT-R
Min, Jung-Sang ; Jo, Seong-Sik ; Myung, Ro-Hae ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 907~914
DOI : 10.5143/JESK.2010.29.6.907
Cognitive model, that is cognitive architecture, is the model expressed with computer program to show the process how human solve a certain problem and it is continuously under investigation through various fields of study such as cognitive engineering, computer engineering, and cognitive psychology. In addition, the much extensive applicability of cognitive model usually helps it to be used for quantitative prediction of human Behavior or Natural programming of human performance in many HCI areas including User Interface Usability, artificial intelligence, natural programming language and also Robot engineering. Meanwhile, when a system designed, an usability test about conceptual design of interface is needed and in this case, analysis evaluation using cognitive model like GOMS or ACT-R is much more effective than empirical evaluation which naturally needs products and subjects. In particular, if we consider the recent trend of very short-end term between a previous technology development and the next new one, it would take time and much efforts to choose subjects and train them in order to conduct usability test which is repeatedly followed in the process of a system development and this finally would bring delays of development of a new system. In this study, we predicted quantitatively the human behavior processes which contains cognitive processes for menu selection in touch screen interface through ACT-R, one of the common method of usability test. Throughout the study, it was shown that the result using cognitive model was equal with the result using existing empirical evaluation. And it is expected that cognitive model has a possibility not only to be used as an effective methodology for evaluation of HCI products or system but also to contribute the activation of HCI cognitive modeling in Korea.
Analysis of Functional Status and Determination for Improvement of ADLs: Korean Elderly
Kim, Sa-Yup ; Park, Seong-Bin ; Hyeong, Joon-Ho ; Chung, Kyung-Ryul ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 915~924
DOI : 10.5143/JESK.2010.29.6.915
Muscular strength in the elderly is important factors deciding on functional state in daily lives, and functional state shows a health condition. Resistance training to prevent loss of muscle mass and muscle fiber atrophy due to aging can increase muscle mass and strength. Recently, resistance training to improve muscular strength and endurance has been actively researched. Resistance training increases activities of daily living and ability of the elderly, which makes healthy senescent. ADL/IADL is suitable for measuring health condition of the elderly. In this study, target muscles of resistance training were chosen through a correlation analysis between ADLs and elementary motion, and we presented a procedure to select target muscles and exercise equipments. This procedure consist of a survey method that were described detailed motion of ADL/IADL. So we should be to extract resistance training machine to improve functions of regarding fundamental motion. Result of study may improve daily life activities of the elderly through objectives and scientific approaches. Furthermore, it will be helpful to studies about various fields of the elderly.
Analysis of 3D Motion Recognition using Meta-analysis for Interaction
Kim, Yong-Woo ; Whang, Min-Cheol ; Kim, Jong-Hwa ; Woo, Jin-Cheol ; Kim, Chi-Jung ; Kim, Ji-Hye ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 925~932
DOI : 10.5143/JESK.2010.29.6.925
Most of the research on three-dimensional interaction field have showed different accuracy in terms of sensing, mode and method. Furthermore, implementation of interaction has been a lack of consistency in application field. Therefore, this study is to suggest research trends of three-dimensional interaction using meta-analysis. Searching relative keyword in database provided with 153 domestic papers and 188 international papers covering three-dimensional interaction. Analytical coding tables determined 18 domestic papers and 28 international papers for analysis. Frequency analysis was carried out on method of action, element, number, accuracy and then verified accuracy by effect size of the meta-analysis. As the results, the effect size of sensor-based was higher than vision-based, but the effect size was extracted to small as 0.02. The effect size of vision-based using hand motion was higher than sensor-based using hand motion. Therefore, implementation of three-dimensional sensor-based interaction and vision-based using hand motions more efficient. This study was significant to comprehensive analysis of three-dimensional motion recognition for interaction and suggest to application directions of three-dimensional interaction.
Development of an Ergonomic Checklist for the Investigation of Work-related Lower Limb Disorders in Farming - ALLA: Agricultural Lower-Limb Assessment
Kong, Yong-Ku ; Han, Jun-Goo ; Kim, Dae-Min ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 933~942
DOI : 10.5143/JESK.2010.29.6.933
Objective: To develop an ergonomic evaluation tool which can be apply to assess the lower-limb postures associated with farming tasks. Background: In general, most of existing ergonomic assessment tools was developed to investigate the work-related musculoskeletal disorders of the upper-limb postures in manufacturing industry. Methods: As the first step of development of the evaluation tool, 13 lower-limb postures that were commonly observed in farming task were investigated by the subjective discomfort ratings, heart rates, and muscle activities. And then, an ergonomic evaluation tool for the lower-limb postures was developed based on results of the first experiment. Lastly, the ergonomic checklist which was developed in the current study was compared with other existing ergonomic assessment tools. Results: Based on the results of comparisons between a newly developed assessment tool and other existing assessment tools, it was found that a newly developed tool can perceive more sensitively for the various lower-limb postures than other assessment tools. Conclusions: Lower-limb posture assessment tool which can evaluate and assess risks of lower-limb WMSDs which were prevalent in farming tasks more easily and accurately was developed in this study. The lower-limb assessment tool can also be utilized to prevent WMSDs related with lower-limbs as well as improve working environments.
Productivity and Task Difficulty Improvement of PCB Soldering Process by Changing Work Interface
Lee, Sung-Koon ; Park, Peom ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 943~949
DOI : 10.5143/JESK.2010.29.6.943
When PCB soldering is performed with microscope due to the electronic components' microminiaturization, workers' awkward upper body postures and difficulties being in focus among lens, object and eyes are one of reasons for productivity decline. The object of this study is to investigate the level of difficulties of work and the extent of productivity improvement by changing work interfaces from the work using microscope to the work using LCD monitor. Independent variables was usage of microscope and image system and dependent variables were upper body segments including neck, shoulder, back, and waist, task convenience and eye fatigue. The Visual Analogue Scale (10cm) was used for questionnaire and one way ANOVA (two levels) and two sample t-test were conducted. In addition, RULA rating was conducted for working postures. The result showed that interface changes of LCD monitor, suggested by productivity comparison per one Man Hour, highly contributed to work convenience and productivity improvement.
A Study on the Job Rotation Types of Assembly Workers in a Motor Company
Jeon, In-Sik ; Jeong, Byung-Yong ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 951~957
DOI : 10.5143/JESK.2010.29.6.951
The purpose of this study is to identify the types and features of job rotation being operated in a motor company. The types of job rotation have been classified according to the range of rotation and its cycle. Also, the features of the favorable rotation types were examined by the worker's age and their types of tasks. The results show that workers prefer broader ranges and slower cycles of rotations as they age. Moreover, older workers tend to show an increase in the preference of participating in job rotations. The result of this study is expected to be applied as fundamental data to job design.
Seat Belt Usage Rate and Unconscious Behavior in the Fastening Process
Hong, Seung-Kweon ;
Journal of the Ergonomics Society of Korea, volume 29, issue 6, 2010, Pages 959~964
DOI : 10.5143/JESK.2010.29.6.959
Seat belt is an important means to protect drivers and passengers from the damages by car accidents. Many ways to increase the seat belt wearing rate have been proposed through human factors researches. The primary ways to increase seat belt use rate have emphasized the intention-behavior cycle. This study focused on the gap between intention and behavior. The gap may be bridged by the habit for seat belt use behavior. Divers following a desirable car starting sequence, from sitting on the chair, fastening seat belt, starting engine to moving a car, reported that higher belt wearing rate and unconscious behavior (automated response). That is, the habitualized procedure knowledge prevented drivers from forgetting to fasten their seat belt. The reminder systems such as warning light and warning sound could not significantly give an influence in remembering to fasten seat belt. In order to increase the seat belt use rate, the desirable car starting procedure should be included in the driving education program.