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F-scan을 이용한 이동식 비계 사용시 자세안정도 평가
김정룡,민승남,이민호,정주현 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
본 연구의 목적은 숙련자와 비숙련자가 이동식 틀비계에서 작업시 안전난간이 있는 경우와 없는 경우와 높이가 1단(1.7m), 2단(3.3m)인 경우에서 인간공학적 평가인 자세안정도(posture stability)에 대한 평가하였다. 실험참가자는 건설현장에 일하는 실험참가자 8명(숙련자 4명, 비숙련자 4명)을 대상으로 평가를 하였다. 그 결과 자세안정도는 숙련도(p<0.01), 높이(p<0.01), 안전난간 유무(p<0.01)에서 유의한 차이가 있었다. 또한 숙련도가 낮을 수록, 작업하는 높이가 높을수록, 안전난간 미설치시에 COP(center of pressure)의 거리, 속도가 증가하였다. 이러한 결과를 통해서 숙련도가 낮고, 이동식 틀비계에 높이가 높고, 안전난간이 없을수록 추락사고에 대한 위험이 증가한다는 것을 알 수 있었다.
정상인과 요통환자의 생체역학적 차이에 관한 연구:신경근육계의 동적 근전도 반응형태를 중심으로
김정룡 대한인간공학회 1995 大韓人間工學會誌 Vol.14 No.2
Neuromuscular difference between normal subjects and low-back pain patients has been identified in terms of neural excitation signal measured by Electromyography (EMG) under the dynamic flexion/extension trunk motion. Ten healthy subjects and ten low-back pain patients were recruited for this study. New parameters and normalization technique were introduced to quantify the muscle excitation pattern among the flexor-extensor pairs of muscles : rectus abdominis (RA)-erector spinae (ES at L1 and L5 level), external oblique (EO)-internal oblique (IO), rectus femoris (quadricep : QUD)-biceps femoris( hamstring : HAM), and tibialis anterior (TA)-gastrocnemius (GAS). Results indicated that the temporal EMG pattern such as peak timing difference between the hip flexor (QUD) and extensor (HAM) and the duration of coexcitation between ES at L5 and RA muscle pairs showed a statistically significant difference between normal subjects and low-back pain patients. Improtantly, this study presented a new technique to identify the dynamic muscle excitation pattern that canb be least affected by EMG-length-velocity relationship. Further study can performed to validate this method for clinical application to quantitatively identify the low-back pain patients in the future.
3차원 동작분석에 의한 요통환자의 정량적 진단기법 개발에 관한 연구
김정룡,Kim, Jeong-Ryong 대한인간공학회 1998 大韓人間工學會誌 Vol.17 No.2
Dynamic motion difference between normal subjects and low-back pain (LBP) patients has been investigated in terms of kinematic variables such as range of motion, velocity and acceleration of the back and hip. Ten healthy subjects and ten LBP patients were recruited in this study. Electro-goniometer such as Lumbar Motion Monitor and Hip Monitor have been used for quantitative measurement of the trunk motion during repetitive flexion and extension for ten seconds. Results indicated that the velocity and acceleration of the back and hip were important parameters to quantitatively identify LBP patients. The consistency of cyclic trunk motion and the relationship between the back and hip were measured in terms of Variance Ratio and Phase Angle in order to accurately assess the motion characteristics of LBP patients. In particular, the hip motion has been proven to be a very important factor in describing the kinematics of damaged lower back. The functional evaluation technique suggested in this study will be a tool to assist physicians for an accurate diagnosis and timely rehabilitation along with current image diagnosis techniques.