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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.
김원범(W. B. Kim),정현교(H. K. Jung),고창섭(C. S. Koh),한송엽(S. Y. Hahn) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.2
A variational approach employing localized functional is presented to solve alternating magnetic field problems with open boundary. The functional used in the approach consists of the domain integral of finite element region only and the boundary integral of the interfacial boundary between the finite and infinite element regions. The boundary integral is obtained by transforming the infinite domain integral for the infinite element region into the interfacial boundary integral. The proposed algorithm is then applied to a simple two-dimensional problem where the analytic solutions are available. It is shown that the algorithm makes it possible to yield good agreements between the numerical and analytic solutions, and that it requires less computer storage memory and computation time than the conventional finite element method due to the reduction of the computing region.
파괴역학과 굴착과 발파로 인한 암반 손상영역의 문헌적 고찰
양형식(Yang H.S.),하태욱(Ha T.W.),김원범(Kim W.B.),정주환(Jung J.H.) 한국암반공학회 2006 터널과지하공간 Vol.16 No.3
터널의 고속굴진을 위한 굴착 및 발파 손상영역을 평가하기 위하여 암반에 대한 파괴역학적 연구 결과들을 조사하고 고찰하였다. 파괴역학을 이용하여 균열의 발생 기구를 확립하고 손상영역을 평가하며 나아가서 균열을 효과적으로 제어하기 위한 시도들이 이루어지고 있으며 그 적용가능성이 높다고 판단된다. Literatures on the fracture mechanics and damaged zone of rocks were studied to estimate the excavation and blasting damaged zone for rapid tunneling. Fracture mechanics were applied to explain fracture mechanism and to estimate damaged zone and seemed to be applicable for controlling the fractures.