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진동자극에 대한 상지 절단자의 전완부 감각 인지 크기와 불쾌감 측정
김솔비(Sol Bi Kim),장윤희(Yun Hee Chang),김신기(Shin Ki Kim),김규석(Gyoo Suk Kim),문무성(Mu Sung Mun),배태수(Tae Soo Bae) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.7
Research involving discomfort or pain related to haptic vibratory stimulation the for prosthesis users of myoelectrical hand is very lacking. Our objective of this study was to evaluate the displeasure and sensitivity of areas in forearm using vibration stimulation system between upper limb amputees and non-amputees. Twenty transradial amputees and forty non-amputees (20 youth, 20 elderly) were involved. We set up custom-made vibration stimulation system including eight actuators (4 medial parts and 4 lateral parts) and GUI-based acquisition system, to investigate changes of residual somatosensory sensibility and displeasure at proximal 25% of forearm. Eight vibration actuators were attached to the circumference of proximal 25% point of forearm at regular intervals. Sensitivity tests were used to stimulate the 120㎐ and discomfort experiment was used to 37 ~ 223㎐. The subjective responses were evaluated by 10 point scale. The results showed that both groups were similar in sensitive areas. Response at around of radius was most sensitive than other areas in all subjects. Elderly group do not appear discomfort of vibrotactile; however, youth group and amputee presented discomfort of vibrotactile. Prosthesis with a vibrotactile feedback system should be developed considering the sensitivity. Furthermore, Future studies should investigate the scope of application of that principle.
장대진(Dae-Jin Jang),김용철(Yong-Cheol Kim),김규석(Gyoo-Suk Kim),홍응표(Eung-Pyo Hong) 한국재활복지공학회 2021 재활복지공학회논문지 Vol.15 No.4
본 논문의 목적은 2중 4절 링크시스템을 이용하여 시트 리프트 메커니즘을 설계하고 좌위변환이 가능한 전동휠체어에 적용하여 시뮬레이션을 통해 다양한 휠체어 동작이 가능함을 보이는 것이다. 기존의 시트 리프트 메커니즘은 리프팅 높이가 충분하지 않거나 후방으로 이동량이 많아서 일상활동 제한과 기구적 안정성에 문제가 있었다. 2중 4절 링크시스템 설계시 1개의 모터로 시트를 리프팅 할 수 있는 연결링크의 길이조건을 계산하여 하부 링크시스템을 설계하였으며, 시트를 상승했을 때 후방으로의 이동거리를 최소화할 수 있도록 상부 링크시스템을 설계하였다. 그 결과 새로운 시트 리프팅 메커니즘은 후방 이동이 적고 시트를 높게 상승시킬 수 있었다. 제안된 시트 리프트 메커니즘은 장애인들에게 필수적인 좌위변환 기능을 제공할 수 있으며 이동관련 일상생활이나 독립적인 생활지원에 사용할 수 있을 것으로 기대한다. The purpose of this paper is to design a lifting seat mechanism using a dual 4-bar linkage, to apply it to a power wheelchair, and to show that various sitting position transitions are possible through simulation. The existing lifting seat mechanism was limited to daily activities because the lifting height is not enough, or it was not safe due to a lot of seat moving backward. When designing a dual 4-bar linkage, the lower 4-bar linkage was designed by calculating length conditions of the coupler link that can lift the seat with one motor, and the upper 4-bar linkage was designed to minimize the seat moving backward when the seat is lifted. As a result, the new lifting seat mechanism was able to lift the seat higher with low backward movement. The proposed lifting seat mechanism can provide an essential sitting position transition function for people with disabilities and is expected to be used for mobility-related activities of daily living or independent living support.
홍응표(Eung-Pyo Hong),김용철(Yong-Cheol Kim),김규석(Gyoo-Suk Kim),류제청(Jae-Cheong Ryu),문무성(Mu-Seong Mun) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.9
The recent power add-on drive wheelchairs (PADWs) provide greater physical activity and easier transportability and may be an excellent alternative for the typical manual and powered wheelchairs. The driving system consists of a motor and a motor driver is the most important component of the PADW. In this paper, design, implementation, and testing of a driving system for a PADW are presented. To design the output power and torque for the driving system, the equation of motion has been investigated. The motor and driver were fabricated with precise machining and assembled to implement our prototype driving system. The dynamometer test has been carried out using the prototype in order to examine the torque of the system. The experimental results demonstrates that the designed driving system can provide enough output power and efficiency for utilization in a PADW.
욕창방지방석용 공기셀의 설계요소에 따른 체압 분포 특성 분석
조현석(Hyeon Seok Cho),류제청(Jei Cheong Ryu),김규석(Gyoo Suk Kim),문무성(Mu Sung Mun),이인혁(In Hyuk Lee) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.5
A finite element simulation model was developed for the performance optimization of a closed type air-cell mattress used for the ulcer prevention. An H-model with material properties of human flesh and kinematic joints were used for the calculation of the body contact pressure. The material property of rubber air-cell was evaluated by tensile test of standard specimen. We evaluated the body contact pressure distribution after laying human model on the inflated air-cell mattress. It was found that the body contact pressure was dependent on cell height, but hardly affected by the thickness of the rubber in a cell.
증강현실 기반 신체운동이 고령자의 보행속도 및 균형능력에 미치는 영향
정보라(Bo-Ra Jeong),장윤희(Yun-Hee Chang),강정선(Jung-Sun Kang),김규석(Gyoo-Suk Kim) 한국디지털콘텐츠학회 2023 한국디지털콘텐츠학회논문지 Vol.24 No.12
Augmented reality (AR) technology has high expectations for use in the field of exercise rehabilitation to prevent falls and improve health in older adults; however, most studies have been conducted on older adults with physical disabilities. Therefore, in this study, we analyzed changes in walking and balance ability after a training intervention to verify the effectiveness of AR-based physical training in older adults. Participants were 16 healthy older adults; experimental and control groups underwent AR-based physical exercise and general physical exercise, respectively, for eight weeks. The results showed that, compared with the control group, walking speed and cadence were significantly increased, and the performance times of timed up and go, figure-of-8 walking, and four square step tests were significantly decreased in the experimental group. Our results indicated that AR-based physical training was more effective than traditional training in improving the walking speed and balance ability in older adults and was expected to be used as an intervention method to prevent falls and improve their physical health.
장윤희(Yoon Hee Chang),고창용(Chang Yong Ko),정보라(Bo Ra Jeong),강정선(Jung Sun Kang),김규석(Gyoo Suk Kim),류제청(Jei Cheong Ryu) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.1
Gait analysis is the best objective measurement tool for monitoring rehabilitation. However, it has limitations to evaluate gait recovery. Previous studies have evaluated the effect of gait training using continuous relative phase. The objective of this study was to determine the effect of gait recovery by rehabilitation gait training on lower limb coordination. We analyzed spatio-temporal parameters and CRP values of hip and knee joints based on gait analysis data obtained by 3D motion analysis system at 15 days intervals in 24 uni-lateral transfemoral amputees participated in IRP. Our results revealed that walking velocity of uni-lateral transfemoral amputees who participated in the program during a mean of 107.1 days was 49.2% faster than that at initial stage. The walking velocity showed a 46% increase at the end of 30 days after training. In gait coordination, values of CRP-RMS and CRP-SD were increased and maintained in-phase pattern. CRP showed symmetry in both limbs at the end of 90 days after training. Therefore, CRP is a significant factor in the gait recovery process. Effects of various rehabilitation training methods can be determined through CRP analysis.