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전한용,김진오,Chun, Han-Yong,Kim, Jin-Oh 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
This paper deals with the measurement of the fluid viscosity by using the torsional vibration of a circular rod excited by a torsional vibrator at one end. The effect of an adjacent viscous fluid on the torsional vibration of the rod has been studied theoretically and expressed in terms of the mechanical impedance. The theoretically-obtained trend that the mechanical impedance is proportional to the square root of the viscosity times the density of the fluid has been confirmed by the impedance measurement. The paper demonstrates that a torsionally-vibrating rod can be used as a sensor to measure the viscosity of a fluid.
전한용(Chun, Han-Yong),김진오(Kim, Jin-Oh),박광훈(Park, Kwang-Hun) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.1
This paper examines the dynamic characteristics of a human carpal muscle through theoretical analysis and experiment. The carpal muscle was modeled as a 1-DOF vibration system and vibration response due to a ramp function force was calculated. The electromyogram signal corresponding to the muscle excitation force was measured, and the excitation force function of an envelope curve from the electromyogram signal was extracted. The ramp input function of electrical stimulation to the carpal muscle was applied by using a device for functional electrical stimulation, and the angular displacements corresponding to steady state response were measured. Theoretical calculations of the vibration response displacements were compared with the experimental results of the angular displacements, and have shown a good agreement with the result that is linearly proportional to the excitation force magnitude. As a result, the relationship between the input current of the electrical stimulation and the excitation force magnitude was inferred. The result was shown that it can be applied to develop rehabilitation training devices.
전한용(Han Yong Chun),김진오(Jin Oh Kim),박광훈(Kwang Hun Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper deals with a human carpal by 3-dimensional dynamic analysis. It is important that the carpal is closely related to the hand motion control. The carpal motion has been theoretically analyzed by 3-dimensional dynamics and compared with experimental results. The anatomical structure and arthrokinematics of the carpal have been defined. The muscle forces generating the carpal motion have been calculated by deriving the equation of motion and assessed by measuring electromyogram.
전한용(Han Yong Chun),김진오(Jin Oh Kim),박광훈(Kwang Hun Park) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.10
본 논문은 인체 수관절 운동과 표면 근전도의 상관관계를 실험적으로 다룬다. 수관절의 해부학적 구조를 분석하여, 수관절 운동 형상을 파악하고 운동을 발생시키는 주요 근육을 선정하였다. 수관절 재활 훈련 장치를 이용하여 수관절 운동에 저항하는 토크를 가하고, 이 때 주요 근육에서 토크에 따른 표면 근전도 신호를 측정하였다. 측정된 표면 근전도 신호의 크기를 계산하여 수관절 운동과의 연관성 분석에 사용하였다. 실험 결과로부터 수관절 토크와 표면 근전도 신호의 크기가 토크 0.1 N m 이하의 수관절 운동에서는 선형적으로 비례함을 밝혔고, 수관절 근육의 단면적에 따라 표면 근전도 신호의 크기도 선형적으로 비례함을 확인하였다. 또한 수관절 운동에 관여하는 각 근육의 기여도를 분석한 결과, 각 운동을 발생시키는 가장 주도적인 2개의 근육 중에서 한 근육의 기여도가 약 60 %로서 일관성 있게 나타났다. 이러한 세 가지 실험 결과로 좀 더 정교한 수관절 재활 훈련 장치나 로봇 등을 제작하는데 응용할 수 있다. In this experimental study, we have examined the correlation between a human carpal motion and a surface electromyogram. The carpal motion patterns have been identified and the main muscles involved in the carpal motion have been determined by investigating the anatomical structure of a carpal. The torque acting against the carpal motion has been applied by using a device for carpal rehabilitation training, and the surface electromyogram signal corresponding to the torque at the main muscles has been measured. The root-mean-square (RMS) magnitude of the surface electromyogram signal has been calculated and used to analyze the correlation between the surface electromyogram signal and carpal motion. The experimental results have proved that for carpal torque values below 0.1 N?m, the RMS magnitude of the surface electromyogram signal is linearly proportional to the carpal torque magnitude and that the carpal torque magnitude is linearly proportional to the cross-sectional area of the carpal muscles. Further, the analysis of the contribution of each muscle to the carpal motion has shown that the contribution of the most dominant muscle is consistently 60%. These three results can be applied to develop more sophisticated devices or robots for carpal rehabilitation training.
전한용(Han Yong Chun),김진오(Jin Oh Kim),박광훈(Kwang Hun Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This paper deals with a human carpal by dynamic analysis. Arms of a human body are composed of the shoulder, upper arm, elbow, forearm, carpal, hand, and fingers. The carpal, which is closely related to the hand motion, has been theoretically analyzed. The anatomical structure of the carpal has been identified and each motion of the carpal has been defined. The forces applied to the carpal have been obtained by deriving the equation of motion and calculating the moment of inertia of the carpal.
Interpretation of Seam Property by Geosynthetics Bonding Method
전한용(Han-Yong Jeon),김원춘(Yuan-Chun Jin),이용준(Yong-Joon Lee),최용석(Yong-Suk Choi),백운일(Un-il Baek) 한국지반신소재학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.11
8 Geotextiles(; 4 woven and 4 nonwoven types), 4 geogrids and 2 geocomposites of [nonwoven/fibers/nonwoven] structure were used to compare the seam properties. Tensile strength retentions of these geosynthetics were evaluated as the degree of damage by chemical degradation. Woven geotextiles showed the higher seam strength in the order (SSd-1 < SSd-2) > (SSa-1 < SSa-2) > geospacer without regard to the design strength. For nonwoven geotextiles, the order of seam strength is geospacer > (SSa-1 < SSa-2). Geogrids showed the higher seam strength in the order of band > geospacers but reduction factors were increased in the order of band > geospacer without regard to the geogrid’s compositions. Finally, geocomposites showed the higher seam strength in the order of geospacer > (SSa-1 < SSa-2).