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RISS 인기검색어
- 검색키워드
- 저자 : Jongseon Kwag (검색결과 2 건)
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Influence of Camera Location on the Accuracy of Visual Estimation of Body Segment
Yan Qu,Jaejin Hwang,Kyung-Sun Lee,Jongseon Kwag,Myung-Chul Jung 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
Objective: The aim of this study is to investigate the influence of camera location on the accuracy of visual estimation (VE) of body segments. Background: Various ergonomic methods have been used to investigate the work-related musculoskeletal disorder factors. The VE method is regard as valid and reliable comparing to the self-report and direct method. The previous VE study is limited by choosing the observational direction. Method: Eight body segments at fullrange of motion (ROM) were presented by a volunteer, the ROMs at each 10º were measured by goniometer and captured from 5 camera locations. Thirty observers visually estimated the segment angles displayed on the digital images. The average absolute error respect to the goniometric measurement was calculated to assess the VE accuracy. Results: For the whole body, the camera location significantly (P<0.0001) affected the VE accuracy, the 135 and 90 degree camera location exposed the lowest error. Hand estimation and foot estimation showed the highest (14.0±11.7º) and lowest (9.0±8.0º) estimation error. Conclusion: The 135 degree camera location is the optimal direction to capture and visually estimate body postures in the laboratory. Application: This study would contribute to the direction determination when applying VE in the field, furthermore to provide the correlated data to assess the bias in epidemiological studies.
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모승민(Seung?Min Mo),곽종선(Jongseon Kwag),정명철(Myung?Chul Jung) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.5
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.
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