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저속 후방 추돌 자원자 실험을 통한 두부와 경부의 동작분석
홍성우,박원필,박성지,유재호,공세진,김한성,Hong, Seong Woo,Park, Won-Pil,Park, Sung-Ji,You, Jae-Ho,Kong, Sejin,Kim, Hansung 한국자동차안전학회 2012 자동차안전학회지 Vol.4 No.2
The purpose of this research is to obtain and analyze dynamic responses from human volunteers for the development of the human-like mechanical or mathematical model for Korean males in automotive rear collisions. This paper focused on the introduction to a low-speed rear impact sled test involving Korean male subjects, and the accumulation of the motion of head and neck. A total of 50 dynamic rear impact sled tests were performed with 50 human volunteers, who are 30-50 year-old males. Each subject can be involved in only one case to prevent any injury in which he was exposed to the impulse that was equivalent to a low-speed rear-end collision of cars at 5-8 km/h for change of velocity, so called, ${\Delta}V$. All subjects were examined by an orthopedist to qualify for the test through the medical check-up of their necks and low backs prior to the test. The impact device is the pendulum type, tuned to simulate the crash pulse of a real vehicle. All motions and impulses were captured and measured by motion capture systems and pressure sensors on the seat. Dynamic responses of head and T1 were analyzed in two cases(5 km/h, 8 km/h) to compare with the results in the previous studies. After the experiments, human subjects were examined to check up any change in the post medical analysis. As a result, there was no change in MRI and no injury reported. Six subjects experienced a minor stiffness on their back for no more than 2 days and got back to normal without any medical treatment.
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발바닥 부위별 인솔 소재 및 경도 변화가 착화감과 충격 흡수에 미치는 영향
류시현(Sihyun Ryu),길호종(Hojong Gil),공세진(Sejin Kong),최용석(Yongsuk Choi),류지선(Jiseon Ryu),윤석훈(Sukhoon Yoon),박상균(Sang Kyoon Park) 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.4
Objective: The purpose of this study was to evaluate the biomechanical effects of insole material and hardness in different plantar regions on the comfort and impact absorption during walking and to analyze the correlations between comfort and impact variables. Background: It is necessary to apply materials tailored to the functionalities of different plantar regions during different phases of the gait cycle: the rearfoot portion should absorb the impact force during the heel-contact phase, the midfoot portion should support the entire arch, and the forefoot portion should enhance the swing efficiency during the toe-off phase. Method: Twenty men in their twenties were recruited for the study (age: 23.4±2.7yrs; height: 175.9±4.1㎝; weight: 72.9±9.4㎏). They wore insoles in random order. Pedar-X system (Novel GmbH, USA) and Treadmill (Instrumented treadmill, Bertec, USA) were used to measure the plantar pressure and ground reaction force. The walking speed was set at 1.3㎧ and 1.7㎧. The sampling rate was set at 50㎐ and 1,000㎐, respectively. For comfort testing, the subjects administered a questionnaire survey using the visual analogue scale (VAS) after walking 1km. Three insole models were tested: Insole A using a mixed material with shock-absorbing and anti-rebound components uniformly spread throughout the insole; Insole B and Insole C using sponge and ethylene vinyl acetate (EVA), respectively, as underlying material and strengthened with shock absorber in the rearfoot portion, high-hardness material in the midfoot portion, and anti-rebound function in the forefoot portion. The impulse, mean impact force, initial peak of ground reaction force, and loading rate were calculated. Results: First, Insole B significantly outscored Insole A in terms of the forefoot cushioning comfort (p <.05), with Insole B and C showing higher overall comfort scores compared with Insole A (p <.05). Second, Insole A showed higher mean impact force, initial and peak vertical ground reaction forces, and loading rate compared with Insoles B and C, but without reaching statistical significance. Third, Insole B and C showed statistically higher mean pressure in the midfoot portion compared with Insole A (p <.05). Conclusion: Positive effects in terms of comfort and impact absorption were demonstrated by the insoles fabricated with different materials and hardness tailored to the functionalities of different plantar regions in comparison with the conventional insoles using the uniform material throughout the insole. In particular, positive effects on overall comfort were found to be ascribable to the enhanced hardness in the midfoot portion, which supported the arch more efficiently and contributed to an even distribution of the overall pressure on the plantar. Application: The study results can be applied to insole development as follows: Insole material and hardness should be varied for different plantar regions, and shock absorber and high-hardness material should be used for the rearfoot and midfoot portions, respectively.
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이미경(Mi Kyoung Lee),서국은(Kook Eun Seo),공세진(Sejin Kong),조영석(Youngseuk Cho),한기훈(Ki Hoon Han),이경준(Kyeongjun Lee) 한국데이터정보과학회 2019 한국데이터정보과학회지 Vol.30 No.1
본 연구의 목적은 미국심장협회 (American heart association) 일반인의 2015’ 가슴압박소생술 (hands-only CPR)가이드라인 권장에 따른 운동학적 분석 자료를 제시하여 피교육자의 보다 나은 가슴압박소생술 실기프로그램의 질과 교육의 활용도를 높이는데 그 목적이 있다. 총 남성 48명을 대상으로 실험군 (24명)과 대조군 (24명)을 비교하기 위해 2015’ 가슴압박소생술 가이드라인의 차이값을 측정하여 교육 전 2015’ 가슴압박소생술 가이드라인과의 차이 (압박위치: 흉골2/1 하단, 압박깊이: 5~6cm 압박속도: 100~120bpm)를 공변인으로 하고 교육 후 2015’ 가슴압박소생술 가이드라인과의 차이를 종속변인으로 하여 공변량 분석을 실시하였다. 분석결과 정확도 (%), 상체와 상완의 각도, 상완과 전원의 각도, 전역수평면과 상체의 각도(수평면), 지면반력의 범위, 구간별 시간 등에서 실험군이 대조군보다 통계적으로 유의한 차가 나타났으나, 대퇴와 하퇴의 각도, 전역수평면과 상체의 각도(시상면)는 집단 간의 차이가 통계적으로 유의하지 않은 것으로 나타났다. 따라서 하체 자세의 각도보다는 상체의 팔 (상완, 전완) 각도와 흉부 압박위치 및 압박속도를 기본으로 체중이 부하되는 전역 수평면과 상체의 각도 (시상면)를 강조하여 교육을 해야 하는 것으로 사려 된다. In this study, male48 Red Cross Youth volunteers in P branch of D organization in P city participated in the experiment, as 24 in the experimental group and 24 in the control group, respectively. For comparison of the two groups, based on the score of the accurate CPR Guidelines, the scores of pre-education posture and post-education posture were measured. Covariance analysis was performed using the SPSS V.19.0 statistical package and the significance level was set to α= .05. As a result, 1. The difference between the CPR-trained and the control group in the depth, the number, and the accuracy of the pressure is statistically significant. 2. The difference between the trained on the angle of upper body and upper arm (sagittal plane) and the control group is E1, E2, and E3, which is statistically significant. 3. The difference between the trained on the angle of upper arm and forearm (sagittal plane) and the control group is E1 and E3, which is statistically significant. 4. The difference between the trained on the angle of global horizontal plane and upper body (Horizontal plane) and the control group is E1, E2 and E3, which is statistically significant. Consequently, this research will give help to educate proper positions in CPR training and to provide high-quality CPR training programs.
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