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THE <i>COSMIC INFRARED BACKGROUND EXPERIMENT</i> ( <i>CIBER</i> ): THE WIDE-FIELD IMAGERS
Bock, J.,Sullivan, I.,Arai, T.,Battle, J.,Cooray, A.,Hristov, V.,Keating, B.,Kim, M. G.,Lam, A. C.,Lee, D. H.,Levenson, L. R.,Mason, P.,Matsumoto, T.,Matsuura, S.,Mitchell-Wynne, K.,Nam, U. W.,Renbarg IOP Publishing 2013 The Astrophysical journal, Supplement series Vol.207 No.2
S. Yabukami,K. Arai,K.I. Arai,S. Tsuji 한국자기학회 2003 Journal of Magnetics Vol.8 No.1
We have developed a new tracking system of jaw movement. The system consists of two permanent NdFeB magnets and 32 elements of two-axial fluxgate sensor array. The two magnets are attached to head portion and front tooth. This system does not need any attachments of the head portion or mouth such as clutch or magnetic field sensor except magnets. The proposed system is applicable for five degree of freedom. Position accuracy within 2㎜ was achieved. We developed a 3D computer input device by using the above mentioned technique.
Band gap shrinkage in GaInAs/GaInAsP/InP multi-quantum well lasers
Park, S. H.,Shim, J. I.,Kudo, K.,Asada, M.,Arai, S. 대구효성가톨릭대학교 자연과학연구소 1992 基礎科學硏究論集 Vol.1992 No.1
We investigated a band gap shrinkage in both lattice-matched and compressive strained GaInAs/GaInAsP/InP multi-quantum well lasers. The band gap shrinkage is obtained from the broadening of the low energy side in the spectrum by considering effects of an intraband scattering and a fundamental band edge. It amounts to 20-25 meV at sheet carrier densities of above 10^12 ㎝^-2, and shows n^1/1.3 dependence at low carrier densities and n^1/3 dependence at higher densities. These dependencies agree well with theoretical predictions in the quantum well.
3차 재결정에 의한 극박 방향성 규소강판의 결정립 크기와 자벽수와의 관계
김영학(Y. H. Kim),荒井賢一(K. I. Arai) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.3
The relationship between grain size and number of magnetic domain walls for tertiary recrystallized ultra thin 3% Si-Fe strips was investigated. It was found that the strips with different grain size can be produced by controlling the inserting speed of sample in annealing furnace. Though grain size of the stirip became smaller than 1㎜, B_8 of high value above 1.95T was obtained. But Hc increased with decaying the grain size. The magnetic domains and losses of the ultra thin grain oriented silicon steel with smaller grain size were observed. The eddy current losses of the strips were decreased with decreasing the grain size in high frequency range because strips with smaller grain have narrower magnetic domain wall spacings. But Hysteresis losses of the strips with smaller grain have high value in low frequency range. Therefore the iron loss of ultra thin grain oriented silicon steel could be controlled by the grain size. It was clarified that the minumum tatal loses depended on the exciting frequency and grain size.