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박용군(Yong-Jun Piao),유미(Mi Yu),김용욱(Yong-Yook Kim),권대규(Tae-Kyu Kwon),김남균(Nam-Gyun Kim) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.6
In this paper, we present the development of a new training system for equilibrium sense and postural control. This system consists of an unstable platform, a force plate, a computer, and training programs. The unstable platform provides 360 degrees of movement allowing for training in all directions. To evaluate the effects of the training system, weperformedvariousexperimentstotraintheabilityofequilibrium sense and postural control of fifteen young healthy subjects. We measured the time a subject maintains his or hercenterofpressure on atarget, the time a subject moves his or her center of pressure to a target, and the mean absolute deviation of thetracebefore and after the training. We analyzed these parameters obtained before and after the training using paried-sample T-test. The result shows that the subjects experienced distinctive enhancement in their ability of postural control through the training using oursystem.
박용군(Yong Jun Piao),유미(Mi Yu),권대규(Tae Kyu Kwon),홍철운(Chul Un Hong),김남균(Nam Gyun Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.8
In this paper, we propose a new training system for the improvement of equilibrium sense using unstable platform. The equilibrium sense, which provides orientation with respect to gravity, is important to integrate the vision, somatosensory and vestibular function to maintain the equilibrium sense of the human body. In order to improve the equilibrium sense, we developed the software program such as a block game, pingpong game using Visual C++. These training system for the equilibrium sense consists of unstable platform, computer interface and software program. The unstable platform was a simple structure of elliptical-type which included tilt sensor, wireless RF module and the device of power supply. To evaluate the effect of balance training, we measured and evaluated the parameters as the moving time to the target, duration to maintain cursor in the target of screen and the error between sine curve and acquired data. As a results, the moving time to the target and duration to maintain cursor in the target was improved through the repeating training of equilibrium sense. It was concluded that this system was reliable in the evaluation of equilibrium sense. This system might be applied to clinical use as an effective balance training system
가상 자전거 시스템을 이용한 고령자의 평형감각 증진에 관한 연구
정성환,박용군,정우석,권대규,홍철운,김남균,Jeong Sung-Hwan,Piao Yong-Jun,Chong Woo-Suk,Kwon Tae-Kyu,Hong Chul-Un,Kim Nam-Gyun 대한전자공학회 2005 電子工學會論文誌-SC (System and control) Vol.42 No.6
본 연구에서는 가상현실기술과 자전거를 이용하여 평형감각 실조환자의 진단 및 시각, 전정감각, 체성감각 등을 효율적으로 진단하고 자극, 훈련시킬 수 있는 자전거 시뮬레이터 시스템을 개발하였고, 이 시스템이 평형감각 훈련에 대한 효과를 고찰하였다. 실험 방법은 20대의 건강한 젊은 성인과 70대의 노인을 대상으로 자전거 주행 시에 나타나는 주행시간, 주행속도, 중앙선이탈도, 무게이동과 무게중심의 변화를 측정하여 가상 자전거 시스템이 평형감각 훈련에 어떠한 영향을 미치는지에 대한 유용성을 분석 하였다. 실험결과, 20대의 젊은 성인과 70대의 노인이 훈련 후 주행속도와 주행시간 중앙선 이탈도가 감소하였고, 좌우 무게이동과 무게중심 면적이 모두 감소하였으며 시각적 피드백의 효과가 평형감각에 더욱 유용하다는 결론을 얻었고 시각적 피드백의 효과를 이용하여 복합 감성정보를 활용한 헬스기구나 평형감각 재활 훈련에 활용할 수 있음을 알 수 있었다. In this paper, a new rehabilitation training system was developed to improve equilibrium sense by combining virtual reality technology with a fixed exercise bicycle. The subjects consisted of two groups. A group of young people, was compared against a group of elderly. We measured three different running modes of virtual bicycle system with two successive sets. The parameters measured were running time, velocity, the weight movement, the degree of the deviation from the road, and the variables about the center of pressure. The repeated training, our results showed that the running capability of the elderly improve compared. In addition, it was found out that the ability of postural control and the equilibrium sense was improved with the presentation of the visual feedback information of the distribution of weight. From the results of this experiment, we showed that our newly developed system might be useful in the diagnosis of equilibrium sense or in the improvement of the sense of sight and, somatic, and vestibular sense of the elderly in the field of rehabilitation training.
가상 자전거 시스템을 이용한 노인의 자세균형 증진에 관한 연구
권대규,윤영일,박용군,김남균,Kwon, Tea-Kyu,Yoon, Young-Il,Piao, Yong-Jun,Kim, Nam-Gyun 대한의용생체공학회 2007 의공학회지 Vol.28 No.5
In this paper, a new rehabilitation training system was developed to improve equilibrium sense of the elderly by combining virtual reality technology with a fixed exercise bicycle. In order to evaluate the effectiveness of the training system, the elderly participated as test subject in the investigation of the influence of different the parameters on postural balance control. We measured three different running modes of virtual bicycle system with two successive sets. The parameters measured were running time, velocity, the weight movement, the degree of the deviation from the road, and the variables about the center of pressure. The repeated training, our results showed that the running capability of the elderly improve compared. In addition, it was found out that the ability of postural control and the equilibrium sense was improved with the presentation of the visual feedback information of the distribution of weight. From the results of this experiment, we showed that our newly developed system might be useful in the diagnosis of equilibrium sense or in the improvement of the sense of sight and, somatic, and vestibular sense of the elderly in the field of rehabilitation training.
자세균형 재활 훈련을 위한 가상 자전거 시뮬레이터 개발
정성환(Sung Hwan Jeong),박용군(Yong Jun Piao),권대규(Tae Kyu Kwon),김남균(Nam Gyun Kim) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.10
The purpose of this study is developing a virtual bicycle system for improving the ability of postural balance control for adults in various age groups. The system consists of an exercise bicycle that allows tilt in accordance with the postural balance of the subject in the system, a visual display that shows virtual road, and a visual feedback system. The rider of the system tries to maintain balance on the bicycle with a visual feedback of a virtual road while the pedaling speed, the heading direction, and various weight distribution information are updated to the subject as visual feedbacks in the display. A series of experiments were performed with various subjects to find the factors related to postural balance control in the system. The related parameters obtained were weight shift, magnitude of the deviation from the center of the virtual road, and variables related to the movement of the center of pressure. The results found that the ability to control postural balance in the system improved with the presentation of visual feedback information of the distribution of weight. It was also found that the general performance of the subject on balance in the system improved after ten days long training. The results show that the newly developed system can be used for the diagnosis of postural balance as well as for the stimulation of various senses such as vision and somatic sense in the field of rehabilitation training.
MR 댐퍼 적용 불안정판을 이용한 재활 훈련시스템 개발
최윤정(Youn-Jung Choi),박용군(Yong-Jun Piao),허민(Min Heo),권대규(Tae-Kyu Kwon),황지혜(Ji Hye Hwang),김동욱(Dong-Wook Kim),김남균(Nam-Gyun Kim) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.2
The purpose of this paper was to develop a rehabilitation training system which is controlled by electric currents to the Magneto-Rheological dampers system. This system provided the function for the training of the unbalance of the lower extremities. 10 subjects executed the tracing and moving exercises which are presented through the display monitor and confirmed own the capability of performance on the task. The electromyographies of the four muscles in lower extremities were recorded and analyzed in the time and frequency domain the muscles of interest were rectus femoris, biceps femoris, gastrocnemius, tibialis anterior. The experimental results showed that subjects had a task under feedback mode then subjects improve the capability of performance, increasing the in time, decreasing the out time and the distance of body shift. The moving average EMG, spectral energy of four muscle is lower the feedback mode than the constant mode. This could aid the hemiplegic patients to train more easily.
권대규(Tae-Kyu Kwon),박용군(Yong-Jun Piao),김동욱(Dong-Wook Kim),황지혜(Ji-Hye Hwang),김남균(Nam-Gyun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We investigated the training effect of postural control for the elderly adults using a training system for postural control that we developed. 15 healthy elderly subjects were in the training group. 15 were as the control group. The training group participated in the training 3 times a week for 8 weeks in 1 hour sessions. To confirm the training effect, we measured relevant parameters such as the time of timed up and go test, and the sway path of center of pressure before and that after the training. The results showed that this training system could successfully improve the postural control capability of the elderly adults. Moreover, the significant improvement in the postural capability of the elderly subjects suggested that elderly subjects could benefit more from the training using the system for the improvement of the ability of postural control.
유미(Mi Yu),이상민(Sang Min Lee),박용군(Yong-Jun Piao),권대규(Tae-Kyu Kwon),김남균(Nam-Gyun Kim) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.1
In situations of spatio-temporal perception about visuo-auditory stimulus, researches propose optimal integration hypothesis that perceptual process is optimized to the interaction of the senses for the precision of perception. So, when the visual information considered generally dominant over any other sense is ambiguous, the information of the other sense like auditory stimulus influences the perceptual process in interaction with visual information. Thus, we performed two different experiments to certain the conditions of the interacting senses and influence of the condition. We consider the interaction of the vi suo-auditory stimulation in the free space, the color of visual stimulus and sex difference of testee with normal people. In first experiment, 12 participants were asked to judge the change in the frequency of audio-visual stimulation using a visual flicker and auditory flutter stimulation in the free space. When auditory temporal cues were presented, the change in the frequency of the visual stimulation was associated with a perceived change in the frequency of the auditory stimulation as the results of the previous studies using headphone. In second experiment, 30 male and 30 female were asked to judge the change in the frequency of audio-visual stimulation using a color of visual flicker and auditory flutter stimulation. In the color condition using red and green. Both male and female testees showed same perceptual tendency. male and female testees showed same perceptual tendency however, in case of female, the standard deviation is larger than that of male. This results implies that audio-visual asymmetry effects are influenced by the cues of visual and auditory information, such as the orientation between auditory and visual stimulus, the color of visual stimulus.