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배주환(Ju-hwan Bae),김규석(Gyu-suck Kim),조현석(Hyun-suck Joo),류제청(Je-chung Ryu),이명준(Myoung-jun Lee),문인혁(Inhyuk Moon) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
This paper proposes a kinematic analysis for a multi-posture controllable wheelchair. The available functions of the wheelchair are reclining, tilting, standing-up, and elevation, which are performed by controlling four linear actuators. The standing-up function is controlled by extending the back-rest and the leg-rest of the seat at once. To optimize the wheelchair posture into the human body structure, the speed of the linear actuators is controlled independently. Simulation results using a wheelchair-seat model proposed in this study show the wheelchair controllable multi-postures is feasible.
편마비 환자 경직의 반사적 및 역학적 성분의 분리를 통한 경직의 정량적 평가
김철승(Chul-Seung KIM),엄광문(Gwang-Moon EOM),김지원(Ji-Won Kim),류제청(Je-Chung Ryu),강성재(Sung-Jae Kang),김요한(Yo-Han Kim),박병규(Byung-Kyu Park) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.7
The aim of this study was to identify both the mechanical and reflex properties associated with spasticity in hemiplegic patients. Ten hemiplegic patients were included in this study. Multiple pendulum tests were executed for each subject, and knee joint angle and EMG of Rectus Femoris muscle were measured. The neuromusculoskeletal system model was developed from generally accepted mechanism and identified through minimization of the error in the modelpredicted pendulum trajectories. The identification was successful in terms of small error in simulated kinematics and high sensitivity and precision of simulated torque against EMG activity. The reflex threshold showed significant difference between different clinical scores (p<0.01) and significant negative correlation (r=-0.93) with the EMG duration. It is expected that the suggested method may help in understanding mechanisms underlying spasticity.
근골격계 모델을 이용한 요추전만 각도 변화가 요추관절에 미치는 영향 분석
배태수(Tae Soo Bae),김신기(Shin Ki Kim),류제청(Je Chung Ryu),문무성(Mu Seong Mun) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.10
It is important to consider lumbar lordotic angle for setup of training program in field of sports and rehabilitaton to prevent unexpected posture deviation and back pain. The purpose of this study was to analyze the biomechanical impact of the level of lumbar lordosis angle during isokinetic exercise through dynamic analysis using a 3-dimensional musculoskeletal model. We made each models for normal lordosis, excessive lordosis, lumbar kyphosis, and hypo-lordosis according to lordotic angle and inputted experimental data as initial values to perform inverse dynamic analysis. Comparing the joint torques, the largest torque of excessive lordosis was 16.6% larger and lumbar kyphosis was 11.7% less than normal lordosis. There existed no significant difference in the compressive intervertebral forces of each lumbar joint (p>0.05), but statistically significant difference in the anterioposterior shear force (p<0.05). For system energy, lumbar kyphosis required the least and most energy during flexion and extension respectively. Therefore during the rehabilitation process, more efficient training will be possible by taking into consideration not simply weight and height but biomechanical effects on the skeletal muscle system according to lumbar lordosis angles.
유성 감속기를 이용한 수·전동 전환 휠체어 구동부 개발
이상일,박성용,오세훈,정태경,류제청 중앙대학교 생산공학연구소 2000 생산공학연구소 논문집 Vol.9 No.2
소형화와 경량화를 만족시키는 유성 감속기는 높은 동력 전달 효율과 시스템 사양에 따라 다양한 감속비를 얻을 수 있는 장점을 가지고 있다. 본 연구에서는 이러한 장점을 가진 유성 감속기를 휠 허브에 내장함으로써 수·전동 휠체어 구동부의 소형화, 경량화를 만족시킬 수 있게 하였다. 그리고 여기에 부합한 모터와 브레이크를 개발, 선정하였다. 본 연구에서 개발한 유성감속기는 효율이 85%로 종전의 웜 감속기 효율보다 약 20% 증가한 수치를 가진다. 본 연구에서 개발한 구동부를 장착한 수·전동 전환 휠체어는 다양한 환경에 적응할 수 있는 다목적 휠체어로써의 기능을 가지고 있다. Planetary Speed Reducer satisfying miniaturization and lightweight has merits that are high power transmission efficiency and an acquire various reduction speed ratios with system specifications. In this study, as Planetary Speed Reducer is inserted into wheel hub, actuator is developed to be able to satisfy miniaturization and lightweight. In addition motors and brake corresponding to miniaturization and lihgtweight of actuator is developed and selected. The efficiency of Planetary Speed Reducer is about 85%. It is higher about 20% than worm speed reducer. The Manual· Electric Convertible Wheelchair Driving System Using Planetary Speed Reducer gets the function of multipurpose wheelchair that can adapt various environment.