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새로이 개발된 음파 진동 레그프레스의 저항 운동 특성 분석
조영근(Cho Young-Kuen),황선홍(Hwang Sun-Hong),김현동(Kim Hyun Dong),김영호(Kim Young-Ho),민진영(Min Jin Young),김한성(Kim Han Sung),임도형(Lim Dohyung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Many studies have emphasized the importance of resistive exercise to maintain a healthy human body, particular in prevention of weakening of physical strength. Recently, some studies advocated that an application of vibration as a supplementary means in a regular training was effective in encouraging physical strength. Aim of the current study was, therefore, to identify if an application of vibration in a resistive exercise was effective in encouraging physical strength as that in a regular training. A 3-dimensional virtual lower extremity model for a healthy male and virtual leg-press model were generated and synchronized. Dynamic leg-press exercises on a slide machine with/without extra load and on a footboard with vibration as well as on a slide machine with extra load were analyzed. The results of the current indicated that the application of the vibration on the dynamic leg-press exercise might be not greatly effective in encouraging physical strength, compared with the dynamic leg press exercise with extra load. It was, however, thought that the application of the vibration might be helpful to elderly individuals because the reduced maximum muscle strength appeared by the effect of the vibration may avoid a muscular spasm, which can be driven from a high muscle strength sometimes produced during the leg-press exercise with extra load.
근골격계 질환 예방을 위하여 새로이 제시된 세탁기 디자인에 대한 생체역학적 평가
조영근(Young Kuen Cho),최희석(Hue Seok Choi),김현동(Hyun Dong Kim),최현호(Hyun Ho Choi),윤종인(join In Youn),김영호(Young Ho Kim),신태민(Tae Min Shin),김한성(Han Sung Kim),임도형(Dohyung Lim) 대한인간공학회 2008 大韓人間工學會誌 Vol.27 No.4
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.
투입구 높이 및 내부 드럼 깊이를 고려한 펄세이터 세탁기 사용시 평균신장 사용자의 관절 토크 및 근력에 미치는 영향
김성국,조영근,이남기,유승현,임도형,김한성,고창용,Kim, Seong Guk,Cho, Young Kuen,Lee, Nam Gi,You, Joshua Sung Hyun,Lim, Dohyung,Kim, Han Sung,Ko, Chang-Yong 대한의용생체공학회 2012 의공학회지 Vol.33 No.4
Many studies have reported that housework done using household appliances may affect biomechanical characteristics of the musculoskeletal system. The purpose of this study was to investigate the effects of housework done using a pulsator washing machine on joints and muscles. We calculated joint torques and muscle strengths on the basis of an experimental/virtual three-dimensional motion analysis for six healthy females using the pulsator washing machine at different heights (H) and depths (D) of the inside drum (H (mm){\times}D (mm), Trial1: $962.5{\times}609.4$, Trial2: $962.5{\times}624.4$, Trial3: $982.5{\times}644.4$, Trial4: $995.5{\times}642.4$, Trial5: $1015.5{\times}677.4$). The joint torques and muscle strengths tended to be considerably different during torso flexion in the sagittal plane for all the trials. The maximum joint torques for the thoracic vertebra, left ankle, and right shoulder measured in Trial4 were significantly higher than those measured in the other trials (p < 0.05); in addition, those for the thoracic vertebra and both ankles measured in Trial5 were significantly higher than those measured in the other trials (p < 0.05). The maximum muscle strengths for the left trapezius muscle and both tibialis anterior muscles measured in Trial5 were significantly higher than those measured in the other trials (p < 0.05). These results indicate that housework done using a pulsator washing machine may affect joint torques and muscle strengths, and these effects are dependent on the height and/or depth of the inside drum of the pulsator washing machine.
김성국(Seong Guk Kim),조영근(Young Kuen Cho),고창용(Chang-Yong Ko),류제청(Jeicheong Ryu),김동현(Donghyung Kim),황동현(Dong Hyung Hwang),송예은(Ye Eun Song),김한성(Han Sung Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
Measuring shear force is important for investigating the pathology and prevention of pressure ulcers. In this study, we introduced a bi-axial shear transducer as a new shear sensor. The sensor is consisted of aluminum and polyvinyl chloride plates placed between quadrangular aluminum plates. The shear force on the interface between the human body and a stand-up wheelchair was measured during sitting or standing movements. Shear forces on the sacrum and ischium were almost five times higher than those on other sites during experiments periods. In conclusion, the proposed shear sensor may be reliable and useful for measuring the shear force on human?machine interfaces.
차량용 시트 조정 변수에 따른 운전자의 요추 모멘트 비교
송예은(Ye Eun Song),김동현(Dong Hyun Kim),김성국(Seong Guk Kim),조영근(Young-Kuen Cho),김성래(Sung Rae Kim),이인주(In Ju Lee),김형주(Hyung Joo Kim),김한성(Han Sung Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Posture at the driver-seat interface has been used as an typical method to assess seat comfort. The driver can control seat conditions, such as height of seat, degree of seat back, and a lumbar support. This study conducted an experiment to the comparison of lumbar moment of drivers and seat condition. The lumbar moment of participants were calculated to the percentage based on ‘94 degree of seat back, high seat pan, without lumbar moment’. The highest moment is ‘94 degree of seat back, low seat pan, without lumbar moment’ and lowest moment is ‘109 degree of seat back, low seat pan, with lumbar moment’. And as the degree of seat back increase with lumbar support, the lumbar moment is lower than the others. Hence, it is supposed that the lumbar moment have relevance to the driving comfort.
인체모델을 활용한 전동킥보드 탑승자의 차량 측면충돌 상해연구
김동현(Dong Hyun Kim),김성래(Sung Rae Kim),조영근(Young Kuen Cho),이근배(Keun Bae Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
The purpose of this study is to predict injuries that occur when e-Scooter rider collides with the side of a vehicle using human body model(HBM) and to present the injury criteria. As social interest in eco-friendly and personal mobility increases, the use of e-Scooter is increasing, and accidents related to them are also increasing. As various accidents occur due to the use of the e-Scooter, this study tried to predict human injury using finite element analysis. Through literature review, an intersection where accidents most frequently occur between e-Scooter and cars was selected as a scenario and constructed as a computer model. A human body model developed by GHBMC was selected to predict injury. In the simulation model, the impact speed of the e-Scooter was selected 6 speeds base on the speed limit of 25km/h in Korea. As human injury factors to be obtained from the simulation model, CD and HIC15, which are used as existing occupant safety, were selected and CSDM and P_ribFrac, which can only be obtained from the human body model, were added. The simulation results show that HIC15, CSDM and P_ribFrac increased according to the e-Scooter velocity increase, but CD was no changed. According to the AIS 3+, there is no change in the death rate to HIC15, CD, but CSDM, P_ribFrac increased. Through the e-scooter rider`s case, when using the injury criteria from HBM such as CSDM, P_ribFrac, the discrimination for each injury was increased. The results of this study will be used for development and evaluation integrated safety equipment to reduce human injury in the future.