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RISS 인기검색어
- 검색키워드
- 저자 : Hanbum Jung (검색결과 4 건)
- 무료
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Seat pressure and subjective comfort for varying sponge hardness and thickness
Jae Hee Park,Seung Hee Kim,Min Uk Kim,Hanbum Jung,Jung Hwan Lee 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
Objective: The aim of this study is to find the proper hardness and thickness of sponge using in office chairs. Background: The comfort of a chair mainly depends on the physical attributes of sponge on a seatpan. However, the optimal values of hardness and thickness are not selected from the view of seat pressure and comfort, but selected from subjective experiences of chair designers. Therefore, it is needed to find the relationship between comfort and sponge thickness and hardness. Method: Sponges varied in hardness with 3 levels and sponges varied in thickness with 5 levels were prepared. Ten subjects were seated on the sponges topped on a table adjustable in height. A body pressure measurement system with 36 x 36 sensors was used to collect pressure and contact area data. Results: In sponge thickness, it is recommended to use the sponge thicker than 50cm. In sponge hardness, there was no significant difference in the hardness range, 17-24kgf/cm3. Conclusion: The optimal sponge thickness and hardness can be decided with relating to sitting pressure and comfort. Application: The result data can be referred in the design of a seatpan.
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Body pressure distributions of the varying sitting postures in office work
Jae Hee Park,Inseok Lee,Min Uk Kim,Seung Hee Kim,Hanbum Jung 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
Objective: The aim of this study is to find the ratio of right sitting posture in office workers' daily job. Background: Although office workers know the right sitting posture, their postures observed are likely to be biased improperly. These behaviors are caused by bad design of chair or by task variables. To find the problem of bad postures, a body pressure mat can be used. Method: Three office workers' seat and back pressure during daily work were measured by using two 36 x 36 pressure mats. Then the average pressure of right/left and posterior/anterior area and back pressure were used to categorizing good and bad postures. Results: Office workers pose properly in only 3.2% of daily work. Most of time, 81.5%, their back were separated from seat back. Also they bent and twisted their back improperly to perform tasks. Conclusion: The result showed that office works pose improperly during work. To maintain the proper posture, ergonomic design in seat pressure is needed. Application: The evaluation method used in this study can be applied to evaluate chairs.
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Development of Ergonomic Balance Seat(e-BASE) Chair
Jae Hee Park,Seung Hee Kim,Min Uk Kim,Hanbum Jung,Young Soo Shim,Taehee Ryu 대한인간공학회 2013 大韓人間工學會誌 Vol.32 No.1
Objective: The aim of this study is to develop an ergonomic office chair that has an alarm function for the unbalanced sitting postures. Background: Contrary to expectation, it is reported that office workers sit on their chairs much more in unbalanced postures during daily work. Even though an office worker uses an ergonomically good-designed chair and begins their work in a good sitting posture, his/her posture is likely to shift to the unbalanced bad posture. Therefore, a posture alarm system would be very helpful in keeping office workers" good postures. Method: We developed a prototype chair with four load cells under a seat pan and one load cell beneath a backrest. Through some experiments, we set the criteria for unbalanced bad postures then implemented the criteria into the alarm system of the prototype chair. The chair called e-BASE chair could detect unbalance postures and show alarms for chair users. We also enhanced back support by developing a step-wised folding backrest. Results: The e-BASE chair showed better performance in interface pressure distributions and balanced posture ratio in VDT work. Conclusion: The ergonomic chair with posture alarm function(e-BASE chair) was developed. It showed better performance in seat pressure distribution and in keeping good posture during office work. Application: The posture alarm system and folding backrest can be applied to the new models of office chair.
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