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Digital Human Simulation을 활용한 방사성 폐기물 처리장 주제어실의 인체공학적 평가
이백희(Baekhee Lee),장윤(Yoon Chang),정기효(Kihyo Jung),정일호(Ilho Jung),유희천(Heecheon You) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.3
The present study evaluated a preliminary control room (CR) design of radioactive waste facility using the JACK<SUP>®</SUP> human simulation system. Four digital humanoids (5<SUP>th</SUP>, 50<SUP>th</SUP>, 95<SUP>th</SUP>, and 99<SUP>th</SUP> percentiles) were used in the ergonomic evaluation. The first three were selected to represent 90% of the target population (Korean males aged 20 to 50 years) and the last to reflect the secular trend of stature for next 20 years in South Korea. The preliminary CR design was assessed by checking its compliance to ergonomic guidelines specified in NUREG-0700 and conducting an in-depth ergonomic analysis with a digital prototype of the CR design and the digital humanoids in terms of postural comfort, reachability, visibility, and clearance. For identified design problems, proper design changes and their validities were examined using JACK. A revised CR design suggested in the present study would contribute to effective and safe operations of the CR as well as operators' health in the workplace.
다중치수제품 설계를 위한 산포대표인체모델 생성 및 분석 시스템 개발
이백희(Baekhee Lee),정기효(Kihyo Jung),유희천(Heecheon You) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
산포대표인체모델(distributed representative human model, DRHM)은 의복과 같은 다중치수제품(multiple-size product) 및 대량맞춤생산(mass customization)을 위한 치수체계 개발에 활용되고 있다. 다양한 DRHM 생성 방법들이 통계적 기법을 적용하여 개발되고 있으나, DRHM 생성 방법들이 용이하게 제품 설계에 적용될 수 있도록 하는 시스템 개발은 미흡한 실정이다. 본 연구는 인체측정자료를 사용하여 DRHM을 생성하고 성능을 통계적으로 평가하는 시스템(DRHM 생성 및 분석 시스템)을 개발하였다. DRHM 생성 및 분석 시스템은 문헌 조사를 통해 파악된 세 가지 방법(grid, cluster, and optimization method)을 적용해 DRHM을 생성할 수 있도록 개발되었다. DRHM 생성 및 분석 시스템의 인터페이스는 세 단계의 대표인체모델 생성 절차(중요변수 선정, 대표격자 형성, 그리고 대표인체모델 치수 추정)에 따라 입력 값을 선택하도록 설계되었으며, 생성된 DRHM은 3차원 시각화와 인구 수용 성능을 통계적으로 분석할 수 있도록 개발되었다. 마지막으로, 개발된 DRHM 생성 및 분석 시스템은 비행복 치수체계 개발 및 인구수용 성능 분석에 적용되어 타당성이 평가될 예정이다. 본 연구의 DRHM 생성 시스템은 설계 대상 인구의 인체크기를 통계적으로 적합하게 대표하는 치수체계 개발에 유용하게 활용될 수 있을 것이다.
장시간 주행 허리 통증 예방을 위한 시트 Lower-Thoracic Support (LTS) 기술 개발
이백희(Baekhee Lee),곽민혁(Minhyuk Kwak),김영식(Yeongsik Kim),안성철(Sungcheul Ahn) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The present study analyzed effectiveness of seat lower-thoracic support (LTS) technology for fundamental prevention of low back pain in long-term driving. A LTS was applied to T10 ~ T12 spine area on seat back by integrating with air cell in-/deflation system. Spine posture bending rates of non-lumbar and LTS were measured and compared by applying a 5-step spine posture estimation method (S1. non-lumbar support spine posture measurement, S2. optimal/maximum LTS spine posture measurement, S3. marker projection to spine, S4. spine posture estimation, S5. spine posture bending rate calculation). Posture and comfort satisfactions of non-lumbar and LTS for one-hour driving were evaluated per 5 minutes by eight seat experts using questionnaire with ten-point scale (0: extremely dissatisfied, 5: moderate, 10: extremely satisfied). The LTS seat makes bended-spine posture maximum 44% erect compared to non-lumbar seat. Posture and comfort satisfaction of LTS were higher 1.5 ~ 2.8 times compared to those of non-lumbar. The LTS can contribute to making/maintaining erect-sitting posture for prevention of lower back pain in long-term driving.
이백희(Baekhee Lee),곽민혁(Minhyuk Kwak),김영식(Yeongsik Kim),안성철(Sungcheul Ahn) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
The present study developed Logistic regression models for discrimination of seat stain degrees. Seat stains have been qualitatively evaluated by a tester using gray scale (G/S) chart (1 ~ 5 points), but quantification of seat stains is needed due to inter-tester variability (e.g., visual acuity, color preference) and intra-tester variability (e.g., condition, feeling). To quantify seat stain degree, a driver’s lower body shaped-seat stain machine was developed for considering real ingress/egress conditions. Seven leather seats and 14 fabric seats, selected for considering full coverage of Lab color space in seat color dimensions, were contaminated using soil cloth (E128), and were measured color difference (ΔE) using color-difference meter. Ninety six ordinal Logistic regression (logit model) model candidates were developed, and then optimal models for leather and fabric seat were selected considering discriminability for 4.5 ~ 3.5 of G/S and %concordant (leather: 95.2%, fabric: 96.7%). Logistic discriminant methods developed in the study can contribute to quantification of seat stain degrees and reduction of customer’s satisfaction.
인간공학적 파워시트 조작 스위치 터치 세분화 기술 개발
이백희(Baekhee Lee),김혁수(Hyuksoo Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
The present study developed an ergonomic touch segmentation technology of power seat operation switch and validated effectiveness of it. A new moving-type power seat operation switch was developed by applying segmentation of touch sensor inside switch cover according to operation area (e.g., upward, backward). For example, the new switch provides only forward arrow for seat back on AVN when touching backside of reclining switch. Usability of the new segmented moving-type (7.6 ± 1.2 pts) switch was superior compared to new push-type (5.1 ± 2.0 pts) and seesaw-type (6.6 ± 1.1 pts) switches developed in the study. The new segmented moving-type switch was superior 62% for feedback accuracy, 88% for information cognitive ability, 72% for ease of operation, and 150% of overall satisfaction compared to existing moving-type switch. The new segmented moving-type switch can contribute to improving usability of power seat switch operation by providing immediate feedback on AVN during driving/parking conditions.