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An Ergonomic Evaluation of an One–Touch System for Shoe Lacing
Kwangae Park,Jangwoon Park,Younggeun Choi,Hyewon Lee,Jongoh Hwang,Heecheon You 대한인간공학회 2012 대한인간공학회 학술대회논문집 Vol.2012 No.11
Background: Ordinary shoes have an inconvenience that the laces should be retied when they are untied, otherwise the wearer could fall down or have a safety accident. Tying shoe laces is especially uncomfortable for seniors and disabled people with difficulty using hands. Objective: Present study validates the ergonomic effects of the one-touch system developed for refining the inconvenience of tying laces and improving prevention of being untied of laces. Method: Validation of the one-touch system has been conducted with eleven seniors, ten disabled people, and ten ordinary adults. They evaluated the one-touch system and the ordinary shoe laces in terms of subjective criteria (overall satisfaction, convenience of use, wearing comfort, securing stability, and motion efficiency) and objective criteria (tying time). Results: The level of overall satisfaction of the one-touch system was 1.6 times higher than ordinary lace shoes where the one-touch system got 6.3 points each from seniors and disabled people, and 5.1 points from ordinary adults while ordinary lace shoes got 3.9 points from seniors, 3.7 points from disabled people, and 3.2 points from ordinary adults. Especially in the group of disabled people and seniors with difficulty using hands, the result of the one-touch system was 1.5 to 4.6 times higher than those of the ordinary lace shoes in terms of convenience of use, securing stability, and motion efficiency. In terms of tying time, buckling the one-touch system shoes took 2.3 to 3.8 times quicker than tying ordinary shoe laces where it took 8.6 seconds for seniors, 11.8 seconds for disabled people, and 6.9 seconds for ordinary adults to tie ordinary shoe laces, while it took 3.2 seconds for seniors, 5.2 seconds for disabled people, 1.8 seconds for ordinary adults to buckle the one-touch system shoes. Conclusion: It was validated that the way of buckling the one-touch system shoes is more satisfactory and efficient than the way of tying the ordinary shoe laces. Application: The one-touch system is highly expected to be applicable to shoes with laces. Moreover, it could be used in product design for seniors and disabled people with difficulty using hands, and children group.
박영근(YoungGeun Park),이중렬(JoongRyul Lee),김범석(BeomSeok Kim),이영호(YoungHo Lee) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
KOWACO - ChangWon Branch - have conducted the new study which aimed to improve flocculation performance in Mixers. The Purposes in this study were increasing flocculation efficiency by finding significant factor which was affected flow characteristics. In the result of this research we modified the error in equation of G-value and RPM which have been used till quite recently. Also we developed program auto-calculating G-value and RPM and then we had made their statistical list. We had conducted experiment with flocculation Mixer's model sized 1/10 by PIV's method. We analysed characteristic of all flow fields by changing case such as changing direction of flocculator roatation etc.
Development of an ergonomic evaluation protocol for a bus seat
Jangwoon Park,Younggeun Choi,Hyewon Lee,Kwangae Park,Moonjin Kim,Heecheon You 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.5
Objective: 본 연구는 버스 승객석 평가에 특화된 체계적이고 종합적인 인간공학적 평가 protocol을 개발하는 것이다. Background: 버스 승객석에 대한 인간공학적 설계를 위해 체계적인 평가 체계가 필요하나 버스 승객석 평가에 특화된 protocol 개발에 대한 연구는 미흡한 실정이다. Method: 버스 승객석 평가 설문지는 평가자들이 기존 버스 승객석들을 종합적으로 비교 평가할 수 있도록 승차자의 3가지 tasks(착석, 업무, 취침), 평가 대상 버스 승객석의 12가지 설계 부위(예: 안전벨트, 팔걸이, 머리지지부, 등받이, 좌면), 그리고 17가지 인간공학적 평가기준(예: 크기 적절성, 형태 적합성, 쿠션감) 간의 연관성을 바탕으로 체계적으로 개발되었다. 실험 참여자들은 모집단의 인체크기분포를 고려해 통계적으로 적합하게 대표하는 인원으로 모집되었으며, 평가환경은 버스 승객석 공간과 유사하게 버스 승객석들을 2열로 배치되었다. 개발된 버스 승객석 평가 protocol은 기존 12종 버스 승객석들의 비교 평가에 활용되었다. Results: 본 연구에서 개발된 버스 승객석 protocol을 통해 버스 승객석에 대한 설계 부위별 선호 특성들이 파악되었다. Conclusion: 버스 승객석 평가에 특화된 인간공학적 평가 protocol이 개발되었으며, 개발된 평가 protocol은 신규 승객석 형상 설계를 위한 기초자료 수집에 활용되었다. Application: 본 연구진은 분석된 선호 설계 특성을 바탕으로 양산형 신규 버스 승객석 설계 및 제작 중에 있다.
Development of statistical geometric models for prediction of a driver's hip and eye locations
Park, Jangwoon,Jung, Kihyo,Lee, Baekhee,Choi, Younggeun,Yang, Xiaopeng,Lee, Seunghoon,You, Heecheon Elsevier 2019 International journal of industrial ergonomics Vol.72 No.-
<P><B>Abstract</B></P> <P>The Society of Automotive Engineers (SAE) J1517 and J941 models of a driver-selected seat position and a driver's eye location mainly rely on their statistical linear relationships with seat configuration and package variables. Although the SAE models are useful for vehicle interior design, their prediction performance was not provided. The present study was intended to develop accurate prediction models of a driver's hip location (HL) and eye location (EL) based on their statistical geometric relationships with anthropometric dimensions and driving postures. A driving simulation experiment was conducted with 40 Korean drivers (20 males and 20 females) in a seating buck reconfigurable to various package conditions. The anthropometric measurements, HLs, ELs, and joint angles of the participants were collected using an anthropometer, a motion capture system, and a digital human model simulation program. Two types (full model and simplified model) of statistical geometric models (SGMs) for HL and EL prediction were developed by multiple regression analysis of the anthropometric measurements and driving postures on the HLs and ELs. The average adjusted <I>R</I> <SUP>2</SUP> and RMSE of the SGMs were .82 (± .06) and 25.7 (±3.3) mm, respectively. The SGMs showed accurate and stable prediction performance because the SGMs additionally incorporated the geometric relationships of HL and EL with anthropometric dimensions and joint angles. The SGMs would be useful to predict the HLs and ELs of drivers with various body sizes and joint angles in occupant packaging.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The present study developed models for predicting a driver's hip and eye locations. </LI> <LI> The relationships between joint locations, body sizes, and angles were quantified. </LI> <LI> The average adj. <I>R</I> <SUP>2</SUP> and RMSE of the models were .82 (± .06) and 25.7 (±3.3) mm. </LI> <LI> The developed models are of use to predict the hip and eye locations of population. </LI> </UL> </P>