http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 이석희(S. H. Lee) (검색결과 103 건)
- 무료
- 기관 내 무료
- 유료
-
펨토초 및 나노초 레이저를 이용한 박막태양전지의 레이저 플라즈마 분광 분석
이석희,최장희,정성호,Lee, S.H.,Choi, J.H.,Gonzalez, J.J.,Hou, H.,Zorba, V.,Russo, R.E.,Jeong, S.H. 한국레이저가공학회 2014 Laser Solutions Vol.17 No.4
In this work, the application of laser induced breakdown spectroscopy (LIBS) for the composition analysis of thin $Cu(In,Ga)Se_2$ (CIGS) solar cell films ($1-2{\mu}m$ thickness) is reported. For the ablation of CIGS films, femtosecond (fs) laser (wavelength = 343nm, pulse width = 500fs) and nanosecond (ns) laser (wavelength = 266nm, pulse width = 5ns) were used under atmospheric environment. The emission spectra were detected with an intensified charge coupled device (ICCD) spectrometer and multichannel CCD spectrometer for fs-LIBS and ns-LIBS, respectively. The calibration curves for fs-LIBS and ns-LIBS intensity ratios of Ga/Cu, In/Cu, and Ga/In were generated with respect to the concentration ratios measured by inductively coupled plasma optical emission spectrometry (ICP-OES).
-
이석희(S. H. Lee),조한석(H. S. Cho),허종규(J. K. Heo),이정헌(J. H. Lee),김희국(H. K. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In this study, a car-door-controlled collision protection system using proximity sensor is proposed and its preliminary analysis and several preliminary experiments are conducted. The proposed system has three additional sub-components on the car-door : that is, a pair of extra electro-magnetic actuator that are attached to the sliding bar of the open/close car-door four-bar mechanism, a proximity sensor that would be attached to the outside surface of the door which is likely to frequently contact to the object and a driving control circuit of the whole system. A proximity sensor is used to detect object close to the car-door, the driving control circuit provides actuating power command to the electro-magnets to generate braking force to stop the swing motion of the car-door. It is verified through kinematic analysis of the four-bar car-door open/close mechanism and through experiments that the magnitude of maximum electronic magnetic force could provide the braking force enough for this application. For this purpose, an electro-magnet driving circuit is implemented and tested. And also to increase the safety of the system a time delay circuit is implemented and tested.
-
이석희(S. H. Lee),최준환(J. W. Choi),문탁진(T. J. Moon),정원용(W. Y. Jeung) 한국자기학회 1998 한국자기학회지 Vol.8 No.3
The purpose of this study is to investigate the variations of rheological and magnetic properties with powder loading in plastic anisotropic ferrite magnets. The measured relative viscosities with powder loading were compared with the calculated ones. The variation of relative viscosities with powder loading was in good agreement with that of particle alignment. Remanent flux density and maximum energy product increased linearly with the increase of powder loading, and then showed maximum values. The decrease of magnetic properties at high powder loading was caused by rapid decrease of particle alignment due to the drastic increase of mixture viscosity. The powder loading for maximum magnetic properties is dependent on magnetic field during injection molding and melt viscosity of binder, so the binder with low melt viscosity is necessary to fabricate the magnet with high properties.
-
플라스틱 자석 혼합물의 균질도 평가방법과 균질도가 자기특성에 미치는 영향
이석희(S. H. Lee),최준환(J. W. Choi),문탁진(T. J. Moon),정원용(W. Y. Jeung) 한국자기학회 1998 한국자기학회지 Vol.8 No.2
Homogeneous feedstock is necessary to make plastic magnets with uniform magnetic properties, therefore the optimized mixing route and the homogeneity evaluation method are demanded. In this paper, method of homogeneity evaluation and effect of homogeneity on the magnetic properties were investigated using Srferrite /EVA plastic magnets. The feedstocks with different homogeneity were prepared using batch mixer and single screw extruder. The homogeneities of feedstocks were tested by torque sensor, capillary rheometer, and measurement of magnetic properties. Mixing torque measurement using torque sensor was an effective method to determine the critical powder loading, but it was not suitable to determine the feedstock mixing quality. Particle alignment measurement of a plastic magnet was very accurate to evaluate the homogeneity, but expensive equipments were required to make and measure the samples. Pressure measurement using capillary rheometer was a very effective and easy method with high accuracy. Homogeneous feedstock increased the particle alignment of plastic magnet. Remanent flux density and maximum energy product increased linearly and quadratically with increasing particle alignment, respectively.
-
-
-
커플링제가 플라스틱 페라이트 자석의 레올로지와 자기특성에 미치는 영향
이석희(S. H. Lee),최준환(J. W. Choi),문탁진(T. J. Moon),정원용(W. Y. Jeung) 한국자기학회 1998 한국자기학회지 Vol.8 No.5
Effects of coupling agents on the rheological and magnetic properties of plastic ferrite magnets were investigated. Magnetic powder used was Sr-ferrite, and binder used was polypropylene (PP), and coupling agents used were γ-methacryloxypropyl trimethoxy silane (A174) and isopropyl triisostearoyl titanate (TTS). It was found that the addition of coupling agents to the PP / ferrite system reduced the melt viscosity and increased the magnetic properties considerably, and the treatment with TTS showed greater effect than A174 did. By comparison with that of the untreated one, the apparent viscosities of the mixtures treated with A174 and TTS decreased 23 % and 50 %, respectively, at the shear rate of 1280 sec-¹. Untreated plastic magnets showed remanent flux density (Br) of 1.89 kG and maximum energy product (BHmax) of 0.84 MGOe, and A174 treated magnets showed of Br 2.25 kG and BH(max) of 1.23 MGOe. TTS treated magnets showed Br of 2.35 kG and BH(max) of 1.33 MGOe.
-
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
