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자동차 충돌안전도 해석용 유한요소 인체 모델 개발 : Part Ⅱ 5% 성인 여성 모델 Part Ⅱ 5% female model
催亨然 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-
The Small female driver is much more vulnerable during the airbag deployment since they tend to sit on the fore side of seat while driving. In order to evaluate the aggressivity of airbag deployment on small female, so called "Out of Position" problem, it is very often to employ the Hybrid Ⅲ 5% dummy. The lack of biofidelity of Hybrid Ⅲ 5% dummy, however reveals the limits to the understanding of OOP related injury mechanism. Accordingly, a finite element model for small female(5%) has been proposed in this study. As a first step, multi-body rigid model, FARB(Female Articulated Rigid Body) has been developed and validated. Some parametric OOP simulation results will be also presented.
OCCUPANT INJURY RISK ANALYSIS AT NASS/CDS DATABASE
최형연,신재호,오창진,배진호 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.5
Injury information for vehicle occupants from the body regions of the head, thorax, abdomen, and upper and lower extremities, due to the restraints and interior parts of the vehicle, were extracted from the 2009 ~ 2012 NASS/CDS database. For those cases with high occurrence frequency, a detailed and comprehensive data analysis was performed to find the relationship between the accident, occupant, vehicle, and injury data. A numerical frontal impact sled model with the Hybrid III dummy and the GHBMC human body model was constructed to simulate and identify those injury risks according to NASS/CDS. Among the 5,734 injuries to the aforementioned body regions from frontal crashes are, listed by frequency of occurrence, the lower extremity (27.8 %), upper extremity (21.3 %), thorax (15.1 %), face (10.9 %), spine (8.7 %), head (7.3 %), and abdomen (6.9 %). The main injury sources to the head were the windshield, side structure, and steering wheel. For the thorax and abdomen they were the seat belt and steering wheel. For the lower extremity it was the instrument panel. The main injury patterns for the head were the concussion and the contusion. For the thorax they were vessel laceration and lung contusion. For the abdomen they were laceration and contusion of the organs. For the lower extremity they were bone fracture and ligament rupture. The steering wheel and seat positions were main factors affecting head and thorax injury risks. From the sled impact simulation, high injury risks of the head and thorax were assessed respectively at conditions of steering column tilt down and rear most seat position, which correlated well with the findings from the NASS/CDS data analysis.
보행 운동학을 위한 기계학습 기반 마커리스 측정 시스템: Part 2 - 비 병리적 보행 및 통계 데이터베이스
최형연,한만용,김성주,김하용,이한철,유태근 사단법인 한국융합기술연구학회 2024 아시아태평양융합연구교류논문지 Vol.10 No.1
본 연구는 시스템 소개 및 검증을 통해 검증한 마커리스 모션 캡처 기술(MMC 방법)을 사용하여 비병리적 보행 운동학(트레드밀 보행 및 지상 보행)에 대한 데이터베이스를 구축하고 통계적으로 분석을 진행하였다. 보행지표(케이던스, 어깨 및 골반 수평각, 어깨, 고관절, 무릎, 발목 관절의 굴곡/신전 동작)의 평균 및 표준편차를 평가하고, 마커리스 방법의 비병리학적 보행 표준 데이터로 활용하였다. 통계분석 결과, 비병리적 트레드밀 보행에서 보행 속도는 보행 운동학에 유의한 영향을 미치는 것으로 나타났다. 그리고 보행 유형(트레드밀 보행 및 지면보행)도 일부 보행 운동학에 영향을 미치는 것을 확인하였다. 사례연구로 병리학적 지면보행과 비병리적 보행을 비교하여 그 차이를 확인하였다. 비병리적 보행에 대한 이 데이터베이스는 의공학 및 의료 산업에 일반적으로 적용되는 중요한 목적 중 하나인 병리적 보행의 비교 평가에 유용할 것으로 보인다. This study established a database on non-pathological gait kinematics (treadmill gait and overground gait) and conducted statistical analysis, using markerless motion capture technology (MMC method) verified through system introduction and verification. Data were collected in three ways, and the collected gait images were analyzed using the MMC method gait analysis system. The mean and standard deviations of gait parameters, such as cadence, shoulder and pelvic horizontal angle, and flexion/extension motions at shoulder, hip, knee, and ankle joints, were evaluated to be utilized as non-pathologic gait norm data of the markerless method. As a result of statistical analysis, the gait speed in non-pathological treadmill walking was found to have a significant effect on some gait kinematics, such as shoulder horizontal angle, shoulder joint angle, hip joint angle, and knee angle. And the gait type (treadmill gait and over ground gait) also affected some of the gait kinematics. As a case study, pathologic over-ground gait was compared with non-pathological gait, and differences were found in the shoulder and pelvis horizontal angle patterns and the timing of maximum flexion/extension of the shoulder joint and lower extremity joint. This database of non-pathologic gait would be valuable for the comparative assessment of pathological gaits, which was one of the significant purposes of general application to the biomedical and healthcare industries.
인공고관절 골흡수로 인한 응력분포 변화의 2차원 유한요소 해석
최형연,채수원,김성곤,Choi, Hyung-Yeon,Chae, Soo-Won,Kim, Sung-Kon 대한의용생체공학회 1995 의공학회지 Vol.16 No.1
Clinically, proximal bone resorption in the femur is frequently seen postoperatively on the follow up XI-rays after total hip replacement (THR). We developed the finite element model of cementless THR. The model is two dimensional side plate model, whereby the three dimensional structural integrity of the bone can be accounted for by a separate two dimensional mesh, a side plate. The subject of this article is the development and application of this two dimensional side plate FEM to study the reverse effect of the various degree of bone resorption of femur after THR. The results of this study indicates that 1) two dimensional side plate model is good and simple alternative to complex three dimensional model and 2) the severity of the proximal bone resorption has the effect of more increasing stress on the cortex at the level of femoral stem tip.