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충돌을 인지한 운전자의 근육긴장에 대한 실험적 그리고 수치 해석적 연구
최형연(Choi Hyung Yun),이범수(Lee Bumsoo),사성진(Sah Sungjin),이인혁(Lee Inhyeok),문무성(Moon Mu Seong),강성재(Kang Sung Jae),조현석(Cho Hyeon Seok) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
Occupants who recognize the approaching crash tend to brace themselves. This reflexive muscular activation can affect the kinematics and kinetics of occupant during the crash event but the mechanisms of potential muscle contraction in car crash event remains poorly understood. A quantitative investigation of muscular activation has been attempted by utilizing dynamometer, sled and EMG devices with human volunteers. The experimental findings have been incorporated into the numerical investigation by utilizing a finite element model of skeletal muscular structure of human body.
충돌을 인지한 운전자의 근육긴장에 대한 실험적 그리고 수치 해석적 연구
최형연(Choi Hyung Yun),이범수(Lee Bumsoo),사성진(Sah Sungjin),이인혁(Lee Inhyeok),문무성(Moon Mu Seong),강성재(Kang Sung Jae),조현석(Cho Hyeon Seok) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Occupants who recognize the approaching crash tend to brace themselves. This reflexive muscular activation can affect the kinematics and kinetics of occupant during the crash event but the mechanisms of potential muscle contraction in car crash event remains poorly understood. A quantitative investigation of muscular activation has been attempted by utilizing dynamometer, sled and EMG devices with human volunteers. The experimental findings have been incorporated into the numerical investigation by utilizing a finite element model of skeletal muscular structure of human body.
FEM 3차원 모델을 이용한 인공관절 대퇴 Stem 경계면의 미세운동 분석
김성곤,최형연,채수원,Kim, Sung-Kon,Choi, Hyung-Yun,Chae, Soo-Won 대한의용생체공학회 1996 의공학회지 Vol.17 No.1
In cementless total hip arthroplasty(THA), an initial stability of the femoral component is mandatory to achieve bony inyowth and secondary long term fixation. Primary stability of the femoral component can be obtained by minimizing the magnitude of relative micromotions at bone stem interface. An accurate evaluation of interf'ace micromotion and stress/strain fields in the bone-implant system may be relevant for better understanding of clinical situations and improving THA design. Recently finite element method(FEM) was introduced in'orthopaedic research field due to its unique capacity to evaluate stress in structure of complex shape, loading and material behavior. The authors developed the 3-dimensional finite element model of proximal femur with $Multilock^{TM}$ stem of 1179 blick elements to analyse the micromotions and mechanical behaviors at the bone-stem inteface in early post-operative period for the load simulating single leg stance. The results indicates that the values of relative motion for this well fit stem were $150{\mu}m$ in maximum $82{\mu}m$ in minimum and the largest relative motion was developed in medial region of Proximal femur and in anterior-posterior direction. The motion in the proximal bone was much greater than in the distal bone and the stress pattern showed high stress concentration on the cortex near the tip of the stem. These findings indicate that the loading on the hip joint in the early postoperative situation before achieving bony ingrowth could produce large micromotion of $150{\mu}m$ and clinicaly non-cemented THA patient should not be allowed weight bearing strictly early in the postoperative period.
이성준(Sungjun Lee),최형연(Hyung Yun Choi),신동욱(Dongwook Shin) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Crash analysis using computer simulation is the significantly economic method to save time and money as compared with sled test. But this analysis is able to make an interpretative problem different from reality by a few of unconsidered factors. So this study is to be able to analyze a more accurate car crash applying to air flow movement that had not been considered before. It is assumed that is different characteristics on condition and It is designed a system of impact experiment of car seat foam considering air flow movement within the foam and pre-strain. This system enables control of pre-strain using electro-magnetic impactor, determination of air flow movement within the foam using punching plate and flow control sensor. It is differ on condition of maximum impact load on the foam, a kind of cover of foam, quantity of pre-strain so as to figure out air flow movement by seat foam used back and cushion by vehicle type. As result, it is observed that maximum load by voltage of electro-magnetic impactor seems repetitiveness of replays on the experiment and that air flow movement from seat foam is belched symmetrically by holes’ position of punching plate. If it is verified additional study on characteristics of seat foam varied by different air flow movement from seat foam, it is able to analyze of car crash using computer simulation more like a reality.
최우진(Woo Jin Choi),곽승호(Seung Ho Kwak),최형연(Hyung Yun Choi) 대한인간공학회 2009 대한인간공학회 학술대회논문집 Vol.2009 No.11
본 연구는 시트 벨트 뻗침 거동 시 발생하는 고령운전자들의 거동 특성 및 불편 정도를 파악하며, 이를 젊은 운전자들과 비교하여 고령운전자를 위한 시트 벨트 위치 설계 가이드라인으로써 제시하고자 수행되었다. 모션캡처 시스템을 이용하여 지원자 별 시트 벨트 뻗침 동작을 수집하였으며 이와 동시에 감성 평가 설문지를 이용하여 주관적 불편 정도를 측정하였다. 본 논문에서는 연구 결과에 대한 첫 번째 분석 단계로 고령운전자들의 시트 벨트 뻗침 거동 특성을 제시하고자 한다. 고령운전자는 젊은 운전자들에 비해 느린 뻗침 거동을 보였으며 이는 대부분 동작 에러에 의한 것으로 나타났다. 또한, 주요 관절 동작에 대해서 고령운전자는 젊은 운전자들에 비해 적은 관절 동작 범위를 이용하는 것으로 나타났다.
자동차 정면충돌에서 운전자 상해 판정식 구축을 위한 슬레드 모델 구축과 시뮬레이션 변수 선정
문준희(Junhee Moon),최형연(Hyung Yun Choi) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A large quantity of real world in-depth crash accident data are needed to make a precise and realistic prediction of occupant injury risk. However there is not enough domestic in-depth crash accident database-which is quite necessary to reflect our nation’s own traffic situation. Therefore we provide numerical method with sled impact simulations to create a virtual crash accident database that may substitute some of real world data set.
최우진(Woo Jin Choi),곽승호(Seung Ho Kwak),최형연(Hyung Yun Choi) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.1
The purvose of this study is to understand motion characteristics of older drivers during reaching seat belt compared to young drivers and to provide design guidelines in order to reduce discomfort for the elderly. The whole body kinematics of each subject was captured using 12-camera motion analysis system. Subjective ratings on discomfort levels were obtained simultaneously using a questionnaire. This paper first presents the result of motion characteristics of elderly drivers' reach motion to seat belt. Compared to young drivers, older drivers performed seat belt reach motions less efficiently and moved slower due to mostly the movement error. Older drivers also made use of reduced joint range of motion in cervical left rotation, lumbar left rotation and right shoulder adduction, which can be explained by their reduced active range of motions (AROMs). To compensate for their reduced joint range of motion, older drivers rotated pelvis more.
최우진(Woo Jin Choi),사성진(Sung Jin Sah),최형연(Hyung Yun Choi) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In order to identify the vehicle access layout elements that may cause discomfort of elderly driver in the access motion, i.e., ingress/egress motions, subjective discomfort ratings of the access motion on a large size sedan were obtained by recruiting thirty elderly volunteers. For a comparison purpose, another thirty young volunteers also participated in the same test protocol of discomfort ratings. From the statistical investigation of both results, it was found that the heights of sidesill and roof are the most discomfort causing elements in ingress motion of elderly volunteers. They complained about the interference and annoyance as well as the muscular burden during the ingress motion with respect to those elements. The sidesill height was the first discomfort elements in egress motion.