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근전도 기반 HCI 기술을 이용한 자발 참여 재활 치료 게임 시스템 구현
강정훈(J. H. Kang),김진수(J. S. Kim),노시철(S. C. Noh),김강수(K. K. Kim),정원범(W. B. Jung),이영호(Y. H. Lee),문치웅(C. W. Mun),최흥호(H. H. Choi) 한국재활복지공학회 2010 한국재활복지공학회 학술대회논문집 Vol.2010 No.11
In this study, we developed a game interface using EMG signal. The developed system could be chosen between single channel mode and four-channel mode. A single channel system can control one of the keys on the keyboard using amplitude EMG signal. The system for acquiring EMG signals consists of four channel. The motions were defined up, right, down and left state. The user"s intent was recognized through thresholding and comparing signals of each channel. The result of direction classification could be controled the arrow keys on the keyboard. An occurred keyboard event could be substituted for the game interface. A developed system can be expected on effective treatment to an interesting rehabilitation.
이원범(W. B. Lee),김경황(K. K. Kim),조균택(J. T. Joe),임경묵(K. M. Lim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This study investigates the effect of cementite phase on surface hardening of carbon steels when the materials are shot-peened with balls with 250㎛ in diameter. Three carbon steels; 0.1%C(AISI1010), 0.45%C (AISI1045) carbon steel and 0.8%(eutectoid carbon steel) was used in this study. Results reveal that increment rate of surface hardness is dependent on carbon content. Grain at the surface transformed into grains with lamellar structure and highly dense dislocations are entangled at the neighboring grains. In case of eutectoid carbon steel, grain size at surface is refined up to 20~30㎚. Owing to severe plastic deformation at the surface of carbon steels, ferrite grain size is refined and spheroidization of cementite is observed. We can deduce that a primary reason for significant surface hardening of carbon steels might be attributed to surface grain size refinement and ferrite solution increase of carbon following cementite dissolution.
아세틸화 케나프 섬유와 폴리락트산으로 구성된 바이오복합재료의 물성 평가
정택준 ( T. J. Chung ),이병호 ( B. H. Lee ),이현지 ( H. J. Lee ),권혁진 ( H. J. Kwon ),장원범 ( W. B. Jang ),김현중 ( H. J. Kim ),엄영근 ( Y. G. Eom ) 한국고무학회 2011 엘라스토머 및 콤포지트 Vol.46 No.3
친환경 소재인 바이오복합재료(bio-composites)의 제조를 위하여 기질 고분자로는 poly(lactic acid) (PLA)를 그리고 충전제(filler)로는 케나프 섬유(kenaf fiber)를 사용하였다. 또한 섬유와 고분자 사이의 계면결합 향상을 위해 아세틸화 케나프 섬유(acetylated kenaf fiber)와 상용화제(compatibilizer)를 첨가해 주었다. 본 연구에서는 화학처리와 상용화제가 기계적-점탄성과 형태학적 특성에 미치는 영향을 평가하였고, 섬유가 소수성이 될수록 기질 고분자와 높은 계면결합을 가지며 물성과 형태학적 성질 또한 향상된다는 결과를 보여줬다. 그러나 점탄성과 유리전이온도에는 큰 영향을 미치지 않는다는 사실을 확인하였다. Eco-friendly materials or bio-composites were made with poly(lactic acid) (PLA) as matrix polymer and kenaf fibers as filler. Also, acetylated kenaf fibers and compatibilizer were adopted in order to improve the interfacial adhesion between fiber and polymer. In this study, the effect of chemical modification and compatibilizer on the mechanical- viscoelastic and morphology properties of the bio-composites was discussed. The hydrophobic fibers by acetylation were known to show better interfacial bonding with the matrix polymer and resulted in improved performance and morphology. Viscoelastic property and glass transition temperature, however, were not nearly enhanced.