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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Ergonomics Society of Korea
Journal Basic Information
Journal DOI :
The Ergonomics Society of Korea
Editor in Chief :
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
Selecting the target year
An Analysis of Factors Affection of Elderly's Speed of Mobile Phone Ability
Yang, Young-Ae ; Jo, Eun-Ju ; Park, Soo-Hee ; Park, Su-Jong ; Kim, Hye-Rin ; Lee, Myung-Hwa ; Yang, Mi-Yeon ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 1~8
DOI : 10.5143/JESK.2008.27.4.001
Objective: This study is to analyze the factor affecting elderly's speed of mobile phone ability. Method: Sixty healthy senior citizens who live in Kim-hye participated in Cognition, Visual perception, Speed of mobile phone ability and the collected data was analyzed by an independent multiple regression analysis. Result: The findings can be summarized as follows; 1. Although men were faster than women while using mobile phone, there was little satisfical significance(p<0.05). 2. Although people in their sixties were faster than people in their seventies while using mobile phone, there was minial difference(p<0.05). 3. The primary factor which affect mobile phone using speed is figure ground, visual memory, visual processing and the most beneficial discovery in the entire project is figure ground(p<0.05). Conclusion: The result of study showed that in order to enhance figure ground, visual memory, visual processing in mobile phone using speed. These results will be consider useful for elderly's mobile phone ability.
A Study on Evaluation of Work Ability and Job Stress for Doctor
Kim, Yu-Chang ; Kim, Jin-Keun ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 9~14
DOI : 10.5143/JESK.2008.27.4.009
Work ability and job stress have become the important issues in Korea workplace recently. This study researched work ability and job stress and analyzed correlation with work ability and job stress using the Work Ability Index(WAI) and the Karasek's Job Content Questionnaire against 152 doctors. The results of this study show that the work ability in doctors was good in general. The work ability and the job stress according to major show statistical significance. The relation between job stress and disease showed statistical significance in musculoskeletal disorders, heart disease, and metabolic disease. The correlations between work ability and job stress showed statistical significance in job demand and job control. This study can be utilized to improve the job ability and prevent some disease from the job stress of doctors.
Comparative Study on the Usability of Semantic Zooming Methods for Efficient Web Browsing on Internet Protocol TV
Hong, Ji-Young ; Chae, Haeng-Suk ; Cho, Won-jung ; Jung, Dae-Hyun ; Kim, Joong-Wan ; Kim, Sung-Eun ; Lee, Hyea-Jung ; Han, Kwang-Hee ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 15~26
DOI : 10.5143/JESK.2008.27.4.015
Recently, Internet Protocol TV technology has a latent power for searching information by using internet-connected interactive TV media. It is hard to browse and search web site conveniently since the visual and input devices are not sufficient for navigating through the websites. Zoomable user interface is a possible solution that may reduce users' task load and improve their performance. In this paper, we made three types of web browsers as scroll, physical zooming and semantic zooming type. Fifteen participants asked to do searching tasks and their task time, accuracy and subjective responses are recorded. In the result, though scroll type is evaluated more efficient than other types in task time and accuracy since participants are familiar with scroll type interface, semantic zooming type is highly rated in subjective responses such as perceived searching efficiency, satisfaction and joyfulness. This result implied semantic zooming is a possible solution which is improving user experience of searching websites using Internet Protocol TV.
Biomechanical Evaluation for Washing Machine Design Suggested Newly for Prevention of Musculoskeletal Disorders
Cho, Young-Kuen ; Choi, Hue-Seok ; Kim, Hyun-Dong ; Choi, Hyun-Ho ; Youn, Join-In ; Kim, Young-Ho ; Shin, Tae-Min ; Kim, Han-Sung ; Lim, Do-Hyung ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 27~35
DOI : 10.5143/JESK.2008.27.4.027
Recently, many studies have reported the fact that an excessively accumulated psychological and physical burden induced from physical labor conducted routinely in home and industry can be one of main reasons of musculoskeletal disorders in the working population. This fact makes increase interests in studies to reduce a risk of musculoskeletal disorders through grafting ergonomic considerations on working environment. However, there are currently limited methodologies in quantitative evaluations of new ergonomic suggestions to reduce a risk of musculoskeletal disorders. The current study is therefore performed to evaluate quantitatively effects of a design of washing machine as a new ergonomic suggestion onto prevention of musculoskeletal disorders, through application of a biomechanical evaluation methodology. For this, three-dimensional motion analysis by using musculoskeletal models with Rapid Entire Body Assessment (REBA), which has been generally used for a simple evaluation of a degree of harmfulness of the human body at specific working postures to be considered, was performed. The results of REBA did not give us enough information and their results were somewhat simple and inaccurate, but the results of the three-dimensional motion analysis give us enough information such as alteration of main muscle forces and joint moments required during washing work. All results showed that the main muscle strengths and joint moments were decreased effectively for reduction of a risk of musculoskeletal disorders during the washing work with newly designed washing machine evaluated in the current study, compared with those generated during the washing work with general washing machine. From these results, it can be concluded that a risk of the musculoskeletal disorders, which may be induced by a repetitive washing work, may be reduced through using the washing machine designed ergonomically and newly. Also, it is thought that if our ergonomic design can be applied for improvement of working environment in lifting and laying works conducted repeatedly for a treatment work of goods, which have a strong resemblance to the behaviors generated frequently during the washing work, a possibility of occurrence of the musculoskeletal disorders by the lifting and laying works may be reduced highly.
Anthropometric Analysis of Korean Helicopter Pilots for Helicopter Cockpit Design
Jung, Kih-Yo ; Jo, Ja-Young ; Jeong, Jeong-Rim ; Park, Ji-Eun ; Lee, Won-Sup ; Uem, Joo-Ho ; Lee, Joung-Hyo ; Kang, Byung-Gil ; Kim, Hee-Eun ; Park, Sei-Kwon ; You, Hee-Cheon ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 37~44
DOI : 10.5143/JESK.2008.27.4.037
To design the cockpit of Korean helicopter, anthropometric data for Korean helicopter pilots as a target population is necessary. The present study measured the body sizes of Korean helicopter pilots to design the cockpit of Korean helicopter, and compared the measurements with those of Korean civilian and the US Army. The sample size was 100 which determined by a statistical analysis. Anthropometric measurements were collected for 100 samples (male = 94, female = 6; age group = 20~40) of Korean helicopter pilots by applying standard measurement protocol. To compare three anthropometric data, Korean civilian and US Army data were controlled by considering age group (20~40) and gender ratio (male: female = 9:1) of Korean helicopter pilots. The average body sizes of Korean helicopter pilots were mostly similar to those of Korean civilian, however, lower limb related variables (hip breadth, popliteal height and thigh clearance) and shoulder-to-elbow length were significantly greater (1~7%) at α=0.05. Furthermore, the average body sizes for Korean helicopter pilots regarding lower limb length and thickness were significantly smaller than those of the US Army (1~12%); however, the average body sizes for Korean helicopter pilots regarding upper body related variables (sitting height, sitting eye height, and acromial height) and hip breadth were significantly greater (0.7~1.9%). Lastly, size variability for Korean helicopter pilots was significantly smaller than those of Korean civilian and the US Army. Anthropometric data for Korean helicopter pilots of the present study was applied to design and evaluate a Korean helicopter cockpit.
Cost-effectiveness Analysis for Clothing Design Improvement Using Ergonomic Methods: Evaluation of Flame-proof Clothing and Design Optimization
Cho, Ja-Young ; Jeong, Jung-Rim ; Yeon, Soo-Min ; Chang, Joon-Ho ; You, Hee-Cheon ; Kim, Hee-Eun ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 45~58
DOI : 10.5143/JESK.2008.27.4.045
Ergonomic techniques have been required to analyze the effectiveness of functional clothing design improvement in a systematic and analytic manner. The goals of the present study are to: (1) comprehensively and analytically examine the effectiveness of clothing improvement by using the relationship analysis between clothing design components (D) and ergonomic evaluation measures (E) and (2) prove the usefulness of cost-effectiveness analysis for clothing design optimization. The cost effectiveness analysis is comprised of the preliminary evaluation based on expertise and the in-depth evaluation where the D-E relationship analysis is applied. As a result of the cost effectiveness analysis applied to flame-proof clothing, an optimal design was identified by analyzing costs and qualitative/quantitative effects. In the preliminary evaluation, the expected effectiveness of each design alternative on wear efficiency and wear comfort was estimated. In the in-depth evaluation, however, the effectiveness of each design alternative was analyzed by quantitative evaluation in a wearing test using a questionnaire prepared based on the D-E relationship analysis. It was concluded that the D-E relationship analysis and the cost-effectiveness analysis are useful for comprehensive evaluation and optimization of functional clothing design.
The Effects of a Deep Cervical Flexion Exercise for Sedentary Workers with VDT Syndrome
Shin, Doo-Chul ; Shin, Won-Seob ; Song, Chang-Ho ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 59~64
DOI : 10.5143/JESK.2008.27.4.059
The aims of this study were to compare and analyze two types of deep cervical flexion exercises, craniocervical flexion and cervical flexion, and to ascertain their relative effects on neck and shoulder pain and functional improvement. The participants of the study were individuals who work in sedentary jobs in an office environment. 54 appropriate subjects were chosen and randomly divided into two groups: one group underwent a craniocervical flexion exercise program and the other a cervical flexion exercise program. The six week exercise program consisted of home exercises performed by each subject five times a week and education once a week. Neck-shoulder pain, muscle strengthening, cervical alignment were measured prior to commencement of the exercise programs and again after six weeks. At completion of the six week, both exercise programs decreased neck pain (p<.05). Forward head postures were reduced, and the craniocervical flexion exercise program was more effective in reducing forward head posture (p<.05). The maximum muscle strength and 50% of maximum muscle strength maintaining time of the deep cervical flexor muscles were significantly increased. There were no significant changes of the cervical lordotic curve. The results of this study showed deep cervical flexion exercise was effective in the treatment of neck and shoulder pain, however craniocervical flexion exercise was more effective than cervical flexion exercise.
A Study on Job Training for Risk Factors Analysts of Work-related Musculoskeletal Disorders
Choi, In-Seok ; Jeong, Byung-Yong ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 65~71
DOI : 10.5143/JESK.2008.27.4.065
This study conducted two surveys to establish an educational system to prevent work-related musculoskeletal disorders. The first survey investigates the factors influencing the recognition of job specifications for risk factor analysts of work-related musculoskeletal disorders. The respondents of the first survey were selected from 173 different small-sized manufacturing enterprises having less than 300 workers and had experienced the inspection of risk factors. The results of the first survey shows that better recognition of job specifications are followed by the increase of education time, but regardless of the positions and periods of job experience. Among the respondents with a high level recognition, the second survey was conducted. According to the results, it is presented that 2, 8, 16 hours are the most suitable for educating workers, superintendents, and risk factors analysts. Based on the results of the second survey, educational contents have also been suggested. This research will provide the basic information when forming education systems to prevent musculoskeletal disorders.
Two - Handed Hangul Input Performance Prediction Model for Mobile Phone
Lee, Joo-Woo ; Myung, Ro-Hae ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 73~83
DOI : 10.5143/JESK.2008.27.4.073
With a rapid extension of functions in mobile phones, text input method has become very important for mobile phone users. Previous studies for text input methods were focused on Fitts' law, emphasizing expert's behaviors with one-handed text input method. However, it was observed that 97% of Korean mobile phone users input texts with two-hands. Therefore, this study was designed to develop a prediction model of two-handed Hangul text entry method including novice users as well as experts for mobile phone. For this study, Fitts' law was hypothesized to predict experts' movement time(MT) whereas Hick-Hyman law for visual search time was hypothesized to be added to MT for novices. The results showed that the prediction model was well fitted with the empirical data for both experts and novices with less than 3% error rates. In conclusion, this prediction model of two-handed Hangul text entry including novice users was proven to be a very effective model for modeling two-handed Hangul text input behavior for both experts.
Design of Web Recommendation Service Based on Consumer's Sensibility
Jeon, Yong-Woong ; Kim, Jae-Kuk ; Park, Ji-Young ; Cho, Am ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 85~94
DOI : 10.5143/JESK.2008.27.4.085
Internet shopping has been getting more rousing due to extension of supply with PC(personal computer) and a rapid rise of use of internet. Some companies have been continually researching in how to serve individuals with each ordered information, which aimed at getting ordinary customers to induce to be loyal customers. For that, there is progress of a service of a web-recommendation which considers individual attribution. This study is suggested a method which is a service of the web-recommendation by access to sensibility ergonomics approach. Previous studies established that service had a weak point. It did not manage to realize new needs of customers. Proposed service of the web-recommendation has been designed, which preferentially propose goods included customer's sensibility to the customer who wants it. This study is expected that it will encourage a rise of products' purchasing power of customers, make an increase in a profit of both sellers and people who operate electric commercial and satisfaction of customers will go up in the same. Also, products accord with sensibility of customers will be recommended customers by the suggested service of the web-recommendation. In addition, there will be a decline of time-consuming about making a choice among some products.
PPG Filtering Method for Respiration Measurement in U-Health Care System
Kim, Jong-Hwa ; Whang, Min-Cheol ; Nam, Ki-Chang ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 95~101
DOI : 10.5143/JESK.2008.27.4.095
This research is to develop PPG filtering method for respiration measurement in U-Health Care system. Respiration rate was determined by filtering PPG and analyzing its spectrum. Optimal filter of PPG has been selected to get respiration by testing 120 sets of experiment data using 700 filtering cases. As a result, 2nd order Bessel-filter that used band-pass cutoff frequency at 0.175~0.4Hz with second order was good at developing respiration signal. Respiration signal in time domain could be continuously analyzed by converting frequency domain using spectrum analysis. 24 seconds has been found to be optimal time duration of collecting PPG data for determining respiration. Therefore, this study was successful of getting not only heart activity but also respiration by only PPG. Minimal invasive measurement obtaining multi-bio information by one sensor can be expected to apply to U-Health Care and human computer interaction.
Ergonomic analysis and Design of an Axilla Crutch Through QFD and Discomfort Experiments
Park, Hee-Sok ; Ok, Dong-Min ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 103~108
DOI : 10.5143/JESK.2008.27.4.103
The aim of this paper is to improve the design of a pair of axilla crutches through quality function deployment(QFD) and discomfort experiments. User needs for the crutches, as well as the engineering characteristics which have influence on the ergonomic quality of crutches were determined from the interview with many users. This information was entered in the house of quality, and the results show that the axillary pad and grip are the most important quality factors. And the results from the discomfort experiments confirmed the QFD output. A prototype reflecting the QFD results was proposed. The present study demonstrated how QFD approach can be a methodological tool geared to greater ergonomics consideration in product design.
Development of Finger Gestures for Touchscreen-based Web Browser Operation
Nam, Jong-Yong ; Choe, Jae-Ho ; Jung, Eui-S. ;
Journal of the Ergonomics Society of Korea, volume 27, issue 4, 2008, Pages 109~117
DOI : 10.5143/JESK.2008.27.4.109
Compared to the existing PC which uses a mouse and a keyboard, the touchscreen-based portable PC allows the user to use fingers, requiring new operation methods. However, current touchscreen-based web browser operations in many cases involve merely having fingers move simply like a mouse and click, or not corresponding well to the user's sensitivity and the structure of one's index finger, making itself difficult to be used during walking. Therefore, the goal of this study is to develop finger gestures which facilitate the interaction between the interface and the user, and make the operation easier. First, based on the frequency of usage in the web browser and preference, top eight functions were extracted. Then, the users' structural knowledge was visualized through sketch maps, and the finger gestures which were applicable in touchscreens were derived through the Meaning in Mediated Action method. For the front/back page, and up/down scroll functions, directional gestures were derived, and for the window closure, refresh, home and print functions, letter-type and icon-type gestures were drawn. A validation experiment was performed to compare the performance between existing operation methods and the proposed one in terms of execution time, error rate, and preference, and as a result, directional gestures and letter-type gestures showed better performance than the existing methods. These results suggest that not only during the operation of touchscreen-based web browser in portable PC but also during the operation of telematics-related functions in automobile, PDA and so on, the new gestures can be used to make operation easier and faster.