• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.1137-1142
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• 2004

Walking training is one of the most important rehabilitation processes with paralysis patient. Walking training by using an orthosis can help advancing a patient's independent level. However, existing orthoses have some serious demerit of mechanical problem that the knee joint is locked in the state where it is completely extended, which increases energy consumption and fatigue. For this reason, it is suggested, for more practical orthosis, that the knee joint should be placed and it should have capability of suspending patient's weight. In this paper, 1-DOF walking orthosis which compensates the demerit of the existing orthosis and secures patient's mobility has been proposed. New orthosis has been designed under the following two premises. First, the knee joint of the orthosis was designed fold in order for the orthosis to move in a walking pattern similar to that of a normal person. Second, the knee joint was designed to extend during the swing phase and lock safely during the stance phase.

• 한국어정보학회:학술대회논문집
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• 2016.10a
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• pp.39-43
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• 2016

'형태소 깎는 노인'은 국어사 자료를 처리하는 고성능 자동 형태분석기의 개발이 난항을 겪고 있는 상황에서 수동으로 형태분석 작업을 하는 연구자들을 지원하기 위하여 개발된 형태분석 보조기이다. 인간과 기계의 분업을 통해 인간의 피로를 최대한 줄이고, 단순 반복 형태에 대해서는 정답을 확실하게 제안할 수 있다는 것이 특징이다. 국어사 자료에는 한국어 정보처리를 위해 필요한 어휘 사전이 없으므로, 문법형태소 사전을 만들어 이를 단서로 조사/어미부와 어간부를 구분하도록 하였다. 이를 통해 구축된 소규모 형태분석 말뭉치들이 장기적으로는 자동 형태분석기의 성능 개선에 일조할 수 있을 것으로 기대한다.

• Annual Conference on Human and Language Technology
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• 2016.10a
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• pp.39-43
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• 2016

'형태소 깎는 노인'은 국어사 자료를 처리하는 고성능 자동 형태분석기의 개발이 난항을 겪고 있는 상황에서 수동으로 형태분석 작업을 하는 연구자들을 지원하기 위하여 개발된 형태분석 보조기이다. 인간과 기계의 분업을 통해 인간의 피로를 최대한 줄이고, 단순 반복 형태에 대해서는 정답을 확실하게 제안할 수 있다는 것이 특징이다. 국어사 자료에는 한국어 정보처리를 위해 필요한 어휘 사전이 없으므로, 문법형태소 사전을 만들어 이를 단서로 조사/어미부와 어간부를 구분하도록 하였다. 이를 통해 구축된 소규모 형태분석 말뭉치들이 장기적으로는 자동 형태분석기의 성능 개선에 일조할 수 있을 것으로 기대한다.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.5 no.1
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• pp.79-85
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• 2011

In this paper, we proposed a design of upper-limb rehabilitation device with power-assist function for stroke survivals. The designed upper-limb rehabilitation device has three degrees of freedom； it is possible to perform flexion and extension motions of wrist, index finger and the other fingers except the thumb independently. The power-assist for wrist motion is performed by a pneumatic double-acting cylinder, but the fingers are actuated by electrical linear actuators to assist motions. A prototype upper-limb rehabilitation device and its controller were implemented. The position controller showed 0.8 mm errors in the steady-state. Experimental results showed that the proposed upper-limb rehabilitation device with power-assist function is feasible.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.5 no.1
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• pp.17-25
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• 2011

This paper aims to find the optimal control gain for enhancing the convenience of electric walking frames and design a control algorithm. With the recent advances in medical technology, there has been a rapid increase in the aging population and a variety of mobile walking frames have been developed for improvement of the quality of life. However, the manual walking frames of such mobile aids don't have any electric motor which helps facilitate elderly users' walking and thus are not efficient enough for the old people of weak strength to use especially when moving on uneven surfaces such as slopes or thresholds. The types of electric walking frames have been developed to overcome such inefficiency. Electric walking frames require users' control operations for motor driving unlike manual frames. Therefore, when they are not properly handled, it causes considerable inconvenience to their users. The present study compared the electric walking frames with manual ones in terms of operational convenience and attempted to improve the user convenience of walking frames varying the control value for user convenience based on certain standards. This paper presented a haptic sensor designed to recognize the will to walk and measure the degree of convenience and proposed a control algorithm for improvement of convenience. For user convenience, this paper evaluated the relative convenience of walking frames in view of changing differences between the center of vehicle (COV) and the center of position (COP). With the employment of an electric walking frame and a new measuring method, all the processes were experimentally tested and validated.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.1
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• pp.42-48
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• 2011

This paper presents the vibration reduction algorithm at the walking-will recognition sensors on the uneven terrain. Recently, concern about walking assistant aids is increasing according to the increase in population of elder and handicapped person. However, most of walking aids don't have any actuators for its movement. So, general walking aids have weakness for its movement to upward/download direction of slope. To overcome the weakness of the general walking aids, many researches for active type walking aids are being progressed. Especially, vibration analysis and impulse reduction are one of the important elements of the active-type walking aid during moving on the outdoor area because the ground has many kinds of obstacles such as speed dumps, puddles and so on. So, we analyze the influence from vibration by uneven terrain. And then, we propose the impulse reduction algorithm to overcome the vibration. All the processes are verified experimentally in an active-type walking aid.

• Proceedings of the KTCVS Conference
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• 1995.10a
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• pp.44-44
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• 1995

• Journal of Biomedical Engineering Research
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• v.24 no.5
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• pp.443-446
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• 2003

In the present study. the design of multi-axial lower extremity orthosis was presented with adduction and abduction force data which were measured from three children with cerebral palsy and a normal child. The measurements of adduction and abduction forces were conducted in standing and wolking condition. Adduction and abduction forces were measured by strain gages which were attached on the lateral uprights of lower extremity orthoses. In the standing condition. addcution force of childrens was distributed from 0.11 kgf to 0.26 kgf. During the walking condition. adduction force was reached to 1.56 kgf and abduction force was reached to 1.52 kgf.

• Communications of Mathematical Education
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• v.14
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• pp.297-326
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• 2001

중학교 수학교과서에는 보조선을 이용하여 해결하는 문제가 많이 제시되고 있다. 그러나 학생들에게는 앞서 배운 성질을 직접적으로 적용한 보조선만이 제시되고 있어서 스스로 보조선을 생각해보거나 이를 통해 추론해보는 경험을 하지 못하고 있다. 그러므로, 본 연구에서는 교과서에서 제시되는 보조선 이외에 다양한 보조선을 이용한 풀이를 제시하고자 한다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.48 no.2
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• pp.53-64
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• 2011

In this paper, we propose a channel estimation of side information method based received motion vectors for distributed video coding. The proposed decoder estimates motion vectors of side information and transmits it to the encoder. As the proposed encoder generates side information which is the same to one in the decoder with received motion vectors, accuracy of side information of the decoder is assessed and it is transmitted to decoder. The proposed decoder can also estimate accurate crossover probability with received error information. As the proposed method conducts correct belief propagation, computational complexity of the channel decoder decreases and error correction capability is significantly improved with the smaller amount of parity bits. Experimental results show that the proposed algorithm is better in rate-distortion performance and it is faster than several conventional distributed video coding methods.