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김정윤,김혜미,박다솜,이진민,김지인 숙명여자대학교 산업디자인연구소 2013 숙명디자인학 연구 Vol.17 No.-
이 연구는 The Housing Finance and Developme nt Centre of Finland에서 주최하는 공모전 Ara Hou sing에 참여한 학생들의 작업을 통해 디자인 프로세 스의 기본 구조를 이해하는 것을 목적으로 하고 있 다. 이 연구를 수행하기 위하여 학생들의 작업 과정 을 크게 네 단계로 구분하였다. 첫 번째 단계로 2049 년의 주거형태를 예측하기 위한 미래 분석을 통한 토 의가 이루어졌으며 이를 바탕으로 프로젝트의 기본 개념을 수립하는 것을 목표로 하였다. 두 번째 단계 로는 그 결과물을 통해 구체적인 디자인 아이디어를 발전시켜 시각화 시키는 것을 과제로 삼았다. 세 번 째 단계에서는 공모전에서 제시한 가이드라인을 충실 히 따르면서도 프로젝트의 개성을 부각시킬 수 있는 디자인 아이디어를 발전시켰다. 마지막으로 결과물을 적절한 시각언어로 표현하도록 하였다. 이를 위해 전 체 15주 수업기간 동안 이루어진 학생들의 작업을 수 집하였으며 실제 공모전 준비기간은 약 11주의 기간 이 소요 되었다. 그러나 학생들의 수준과 공모전의 준비기간을 고려하였을 때 충분하게 완성된 결과물을 얻지 못하였다. 따라서 향후 본 연구에서 적용한 방 법론을 다른 연구에 적용시킬 때에는 학생들의 다양 한 수준에 따른, 최상의 결과물을 얻기 위한 준비기 간을 충분히 고려해야 할 것이다.
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Consistency of the Optimized Bandwidth in Filter-based Fatigue Index
김정윤,김영호,손종상 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
In this study, we evaluated the cut-off frequency of the filter-based fatigue index using surface electromyography (EMG) signals fromdifferent upper and lower extremity muscles under different exercise conditions. Twenty seven subjects participated in isotonic kneeextension exercises, fourteen subjects in isotonic elbow flexion and isokinetic knee extension exercises, and twenty subjects in isometricknee extension, isotonic ankle dorsiflexion, and isotonic elbow extension exercises. EMG signals were obtained from right rectusfemoris (RF), vastus medialis (VM), vastus lateralis (VL), biceps brachii (BB), triceps brachii (TC), and tibialis anterior (TA) musclesduring exercises. The filter-based fatigue index was compared with sEMG-based fatigue indices such as mean root-mean-square(RMS) values, median frequency, Dimitrov spectral index, and Gonzalez-Izal wavelet index. Results showed that optimized cut-offvalues for all muscles and all exercises approximated to 350 Hz. This implies that the cut-off frequency of 350 Hz is appropriate forgeneral use, showing better determination coefficient with biomechanical fatigues such as joint torques and powers than the otherfatigue indices in different muscles during different exercises.
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Beam Vibration Control Using Cellulose-based Electro-Active Paper Sensor
김정윤,이호철,김흥수 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
Cellulose based Electro-Active Paper (EAPap) has recently shown a great potential as an environment-friendly smart material due to its biodegradability, biocompatibility and flexibility. Lots of studies have been conducted to investigate the basic smart characteristics of EAPap, but its application has not yet developed well. In this paper,the possibility of cellulose-based Electro-Active Paper (EAPap) as a piezoelectric sensor was investigated by the vibration control of the cantilevered beam. The EAPap sample was attached at the root of the cantilevered beam and used as a vibration sensor. The piezoceramic patch was also attached at the root of the beam and played as an actuator. The voltage output of EAPap showed exact dynamic characteristics of the cantilevered beam. The frequency bandwidth and quality factor of EAPap were similar to those of piezoceramic patch, which results EAPap has similar sensing capability of piezoceramic patch. To find the application of EAPap sensor, beam vibration control was performed. EAPap sensor output was considered as a position error of the cantilevered beam and a simple PID controller was designed to suppress the vibration of the beam. The EAPap sensor output provided clear time response of the beam. The controlled system showed good vibration control performance of the beam. The results provided that the piezoelectric characteristic of EAPap has a great potential as a sensor and also as a new smart material
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A Novel Approach of Defining Fatigue Indices with sEMG Power during Isotonic Contractions
김정윤,김영호,박선우,안순재 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
A new fatigue index for the assessment of peripheral muscle fatigue during isotonic contraction was defined in this study. Twenty subjects performed five sets of ten isotonic contractions with two minutes of rest between each set. Surface electromyography (sEMG) was recorded from the rectus femoris muscle for each subject. The new fatigue index (FIhlrx) was defined as the ratio of the high frequency component to the low frequency component of raw EMG signals. The accuracy of the proposed index was compared with that of well-known EMG-based fatigue indices such as the root mean square (RMS)and median frequency (Fmed). Results showed that the indices proposed in this study were more accurate than those traditional approaches. In particular, FIhlr360 was the most strongly correlated with mechanical joint power (r = 0.749). The new fatigue index could serve as a reliable tool for the assessment of peripheral muscle fatigue, irrespective of EMG signal variability caused by dynamic contractions.
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김정윤,이종신,용화영,김지영,박경덕 대한산업공학회 2011 대한산업공학회 춘계학술대회논문집 Vol.2011 No.5
Gesture-Recognition is the technique that is making a interface between computer and human with interpreting human gestures via mathematical algorithms. With the progress of computer vision and image processing technique, it is expected to become a new human-machine interface which is able to alternate the keyboard and mouse. In this Study, As an ini t ia l st ep of research, We will introduce the result of research about applying gesture-recognition technique to perform the basic control of digital mock-up system using gesture-recognition sensor. And propose the ways to apply gesture-recognition technology into the military training system.
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