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길세기(S. K. Kil),이상철(S. C. Lee),김태완(T. W. Kim),황종학(J. H. Hwang),홍응표(E. P. Hong),한영환(Y. H. Han),이종실(J. S. Lee) 한국재활복지공학회 2013 재활복지공학회논문지 Vol.7 No.2
본 논문에서는 전동휠체어용 압력분포 측정시스템을 개발하고, 실제 휠체어 사용자들을 대상으로 동작분석과 연계한 압력분포 변화실험을 통해 유의성을 검증하고자 하였다. 측정시스템은 휠체어 이동방향에 따른 압력분포 변화 측정을 위해 64ch의 시트쿠션 FSR 센서신호 및 좌·우 각 30ch의 팔걸이 FSR 센서신호를 2ch의 좌·우 바퀴형 엔코더 신호와 동시에 12bit, 10Hz의 샘플링 속도로 획득할 수 있도록 개발하였으며, 이 신호들을 USB 인터페이스를 통해 휠체어 뒤쪽에 장착 가능한 노트북PC로 전송 후 실시간으로 화면표시, 저장, 재생을 수행할 수 있는 실시간 신호처리 소프트웨어를 개발하였다. 개발된 측정시스템을 사용한 압력분포 변화 실험은 실제 휠체어 사용자 10인을 대상으로 적외선 마커 기반의 동작분석실에서 3D 동작분석과 연계하여 실시하였다. 실험결과, 휠체어 진행 중 회전구간에서 몸이 회전의 바깥 방향으로 기울어지는 것을 확인할 수 있었으며 실험결과 및 실험 후 인터뷰를 통해 전동휠체어 설계 시 시트의 형태에 대한 개선요구사항을 획득할 수 있었다. In this paper, we developed pressure mesuring system for powered wheelchair and tried to validate the usefulness of developed system by pressure measuring experiment with 3D motion analysis. This system consist of 64ch seat FSR(Force Sensitive Resistance) sensor unit, 30ch*2 armchair FSR sensor unit, analog and digital hardware board, 2ch rotary encoder unit and realtime signal processing & display S/W. And each data acquired from this system has sampling frequency of 12bit, 10Hz. Pressure measuring experiment for 10 persons who use wheelchair in real life was performed in the 3D vision analysis room. From the experiment, we obtained result that the center line of body inclined to outside direction during powered-wheelchair rotate any direction.
이상철(S. C. Lee),심덕남(D. N. Shim),공창식(C. S. Kong) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.11
Component reliability is most important in nuclear power plants and other large industrial plants. For example, steam generator failures are very costly and dangerous, in terms of lost production as shutdown and drain radioactive. In the fabrication of steam generator, the tubes are attached to the tubesheet by means of an expansion process, including mechanical rolling, explosive expansion and hydraulic expansion. Tube expansion by its nature creates a high level of residual stresses in the tube wall. Residual stress, combined with the interference, create a stress field which increases the susceptibility of the tube to stress-corrosion cracking(SCC) with its costly consequences. This paper presents an experimental technique for the detailed determination of the state of residual stress, evaluation of the residual stresses in the three expansion methods.
이상철(S. C. Lee),김영근(Y. G. Kim),이효덕(H. D. Lee),김세현(S. H. Kim),정한식(H. S. Chung),정효민(H. M. Jeong) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The latent heat of evaporation of LNG is very effective and this generated in vaporization process of LNG. This energy is evaluated with value of 199.12 ㎉/㎏ (1.03 atm, -16 1 ~ 0℃). The purpose of this study represents the heat exchange characteristics of super low temperature liquefied natural gas. As the experimental liquefied gas, LN₂ was used in experiment and the main experimental parameter is chosen the flow rate and inflow air velocity. The experiment was performed for twenty minutes with several times. Temperatures distributions were obtained by T-type thermocouples. The heat exchange effects were dropped by a moisture freezing at heat exchange surface and various inlet air velocity were considered for temperature environment in chamber.