근전의수용 소형 표면 근전위 센서의 개발

최기원,성소영,문인혁,Choi, Gi-Won,Sung, So-Young,Moon, Inhyuk 대한전자공학회 2005 電子工學會論文誌-SC (System and control) Vol.42 No.6

This paper proposes a compact-sized surface myoelectric sensor for the myoelectric hand prosthesis. To fit the surface myoelectric sensor in the socket for the myoelectric hand prosthesis, the sensor should be a compact size. The surface myoelectric sensor is. composed of a skin interface and a single processing circuit that are mounted on a single package. The skin interface has one reference and two input electrodes, and the reference electrode is located in the center of two input electrodes. In this paper we propose two types of sensors with the circle- and bar-shaped reference electrode, but all input electrodes are the bar-shaped. The metal material of the electrodes is the stainless steel (SUS440) that endures sweat and wet conditions. Considering the conduction velocity and the median frequency of the myoelectric signal, we select the inter-electrode distance (IED) between two input electrodes as 18mm, 20mm, and 22 mm. The signal processing circuit consists of a differential amplifier with a band pass filter, a band rejection filter for rejecting 60Hz power-line noise, amplifiers, and a mean absolute value circuit. We evaluate the proposed sensor from the output characteristics according to the IED and the shape of the reference electrode. From the experimental results we show the surface myoelectric sensor with the 18mm IED and the bar-shaped reference electrode is suitable for the myoelectric hand prosthesis. 본 논문에서는 근전의수용 소형 근전위 센서를 제안한다. 근전의수용 근전위 센서를 의수 소켓에 내장시키기 위해서는 소형이어야 한다. 제안된 근전위 센서는 피부와 접촉하는 전극과 신호처리를 위한 회로부가 일체화된 형태로 소형화 하였다. 기준 전극은 두 입력전극의 가운데에 나란히 배치되고, 입력전극은 막대형, 기준전극은 막대형과 원형의 두 가지 형상으로 설계하였다. 두 입력전극 사이의 간격은 근섬유의 근전위 신호의 전도속도와 중심주파수를 고려하여 18mm, 20mm, 22mm 의 세 개의 서로 다른 간격을 가진 전극을 제작하였다. 사용된 전극의 재료는 땀이나 습기에 강한 SUS440 금속을 사용하였다. 신호처리 회로부는 대역통과 필터를 갖는 차동 증폭기, 전원노이즈를 제거하기 위한 대역저지 필터, 교류결합증폭기, 절대평균값 회로로 구성되어 있다. 실험에서는 정상인의 전완에서 근전위 신호를 취득하여 주파수 분석하고, 입력전극 사이의 간격과 기준전극의 형상에 따른 출력특성 평가하였다. 본 논문에서는 실험의 결과로부터 두 입력전극간의 거리가 18mm 이면서, 입력전극의 형상과 기준전극의 형상이 모두 막대형인 표면 근전위 센서가 근전의수에 최적임을 보인다.

족관절 충돌 증후군

최기원,최우진,이진우,Choi, Gi-Won,Choi, Woo-Jin,Lee, Jin-Woo 대한족부족관절학회 2012 대한족부족관절학회지 Vol.16 No.1

The ankle impingement syndrome is an established cause of ankle dysfunction. In most cases with suspected ankle impingement, the diagnosis can be possible on the basis of mechanism of injury involved and the clinical examination. An appropriate imaging study should be selected where clinical doubt about the exact diagnosis exists. Radiography plays an important role in the initial assessment of these conditions, especially in anterior and posterior impingement. Magnetic resonance arthrography seems to be the most accurate means of assessing the capsular abnormalities present in anterolateral and anteromedial impingement and for confirmation of possible concomitant injury. Surgical treatment can be considered for the patients who did not respond to conservative treatment for more than 6 months, and has a low complication rate and a high level of success.

족관절 인공 관절 치환술

최기원,최우진,이진우,Choi, Gi-Won,Choi, Woo-Jin,Lee, Jin-Woo 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.3

Although first generation total ankle replacement (TAR) had high failure rates, recent investigations have reported good results of the newer generations of TAR due to advances in implant designs and techniques. Patient selection is critical to performing TAR to obtain promising outcomes and to decrease complication rate. As the current concepts of correcting the accompanying deformity have been established, TAR in moderate to severe varus deformity of the ankle result in favorable outcomes and indications for TAR are expanding. Correction of deformity and hindfoot fusion should be performed in conjunction with TAR if needed. If radiolucency around components or osteolysis is progressive during follow-up, CT should be carried out as a confirmative diagnostic method. TAR is an effective treatment modality alternative to ankle fusion. However, we should recognize that TAR is a demanding procedure, which requires accurate techniques, enough experience, and preoperative plan for a concomitant deformity.

e-Learning시스템 구축에 있어서 분산멀티미디어 시스템의 활용

최기원(Gi-Won Choi),서갑선(Gab-Seon Seo),박만곤(Man-Gon Park) 한국멀티미디어학회 2003 한국멀티미디어학회 학술발표논문집 Vol.2003 No.2

기준전극의 형상과 입력전극사이의 간격을 고려한 건식형 표면 근전위 센서 개발

崔基源(Gi-Won Choi),崔圭夏(Gyu-Ha Choe) 대한전기학회 2006 전기학회논문지 D Vol.55 No.12

This paper proposes a dry-type surface myoelectric sensor for the myoelectric hand prosthesis. The designed surface myoelectric sensor is composed of skin interface and processing circuits. The skin interface has one reference and two input electrodes, and the reference electrode is located in the center of two input electrodes. In this paper is proposed two types of sensors with the circle- and bar-shaped reference electrode, but all input electrodes are the bar-shaped. The metal material of the electrodes is the stainless steel (SUS440) that endures sweat and wet conditions. Considering the conduction velocity and the median frequency of the myoelectric signal, the inter-electrode distance (IED) between two input electrodes as 18㎜, 20㎜, and 22㎜ is selected. The signal processing circuit consists of a differential amplifier with a band pass filter, a band rejection filter for rejecting 60㎐ power-line noise, amplifiers, and a mean absolute value(MAV) circuit. Using SUS440, six prototype skin interface with different reference electrode shape and IED is fabricated, and their output characteristics are evaluated by output signal obtained from the forearm of a healthy subject. The experimental results show that the skin interface with parallel bar shape and the 18㎜ IED has a good output characteristics. The fabricated dry-type surface myoelectric sensor is evaluated for the upper-limb amputee.

2자유도 전동의수의 제어알고리즘 설계

최기원(Gi Won Choi),최규하(Gyu Ha Choe),김홍성(Hong Sung Kim),신우석(Woo Seok Shin) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-

In this paper presents a control algorism for myoelectric hand prosthesis(MHP) with 2 degree of freedom(DOF), which consists of a mechanical hand, a surface myoelectric sensor(SMES) for measuring myoelectric signal, a control system and a charging battery. The actuation for the 2-DOF hand functions such as grasping and wrist rotation was performed by two DC-motors, and controlled by myoelectric signal measured from the residual forearm muscle. The two controllers were made of a RISC-type microprocessor, and its software was executed on a real-time kernel. The experimental results were showed that the proposed a control algorism is feasible for the MHP.

전동의수용 근전위 센서 설계

최기원(Gi Won Choi),최규하(Gyu Ha Choe) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-

This paper proposes a dry-type surface myoelectric sensor for the myoelectric hand prosthesis. The designed surface myoelectric sensor is composed of skin interface and processing circuits. The skin interface has one reference and two input electrodes, and the reference electrode is located in the center of two input electrodes. Considering the conduction velocity and the median frequency of the myoelectric signal, the inter-electrode distance (IED) between two input electrodes as 18㎜, 20㎜, and 22㎜ is selected. The signal processing circuit consists of a differential amplifier with a band pass filter, a band rejection filter for rejecting 60㎐ power-line noise, amplifier, and a level circuit. Using SUS440, six prototype skin interface with different reference electrode shape and IED is fabricated, and their output characteristics are evaluated by output signal obtained from the forearm of a healthy subject. The experimental results show that the skin interface with parallel bar shape and the 18㎜ IED has a good output characteristics. The fabricated dry-type surface myoelectric sensor is evaluated for the upper-limb amputee.

전동의수 훈련시스템 설계

최기원(Gi Won Choi) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-

This paper presents the training system of myoelectric hand prosthesis controlling according to myoelectric signal generated in the human muscle. The training system consist of a trainer, a program for training. The experimental results proved the reliability of proposed training system.

근전위 신호구동형 전동의수의 파지력 제어

최기원(Gi Won Choi),최규하(Gyu Ha Choe),신우석(Woo Seok Shin) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-

This paper presents the grip force control of myoelectric hand prosthesis according to myoelectric signal generated in the human muscle. The control system consist of a controller for driving DC motor, torque sensor for measuring out torque of motor, slip sensor for detecting slip of torque. The experimental results proved the reliability of proposed control system.

근전의수의 성능시험방법에 대한 연구

최기원(Gi Won Choi),최규하(Gyu Ha Choe),신우석(Woo Seok Shin) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7

This paper propose the test method for performance of myoelectric hand prosthesis(MHP) according to myoelectric signal generated in the human muscle. The MHP consists of a mechanical hand, a surface myoelectric sensor(SMES) for measuring myoelectric signal, a control system and a charging battery. The propose test method is proved the reliability of MHP.