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Fe80 B12 Si8 비정질 합금에 Cr 첨가가 자기적 성질에 미치는 영향
신찬수,송진태 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.11
The effect of Cr element and heat treatment on the physical and magnetic properties of Fe_(80)B_(12)Si_8 (at.%) amorphous alloy which has a high saturation magnetization and a low core loss was investigated in this study. The (Fe_(1-x)Cr_x)_(80)B_(12)Si_8 (x= 0-0.10) amorphous allay ribbons were fabricated by single roller method and annealed for 20 minutes at various temperatures below the crystallization temperature in Ar gas atmosphere. With increasing Cr contents, it was found that crystallization temperature increased from 472℃ to 490℃ and soft magnetic properties were improved. The coercive force decreased and the maximum permeability increased with increasing Cr contents. These improvements may be attributed to the decreasing of magnetostriction by Cr addition to Fe_(80)B_(12)Si_8 alloy. The annealing treatment improved the soft magnetic properties of Fe_(1-x)Cr_x)_(80)B_(12)Si_8 amorphous alloys and the optimum annealing temperature was 60℃ lower than the crystallization temperature. Coercive force and high frequency magnetic properties of (Fe_(0.96)Cr_(0.04))_(80)B_(12)Si_8 amorphous alloy that was annealed at 425℃ for 20 minutes were comparable to a zero magnetostrictive Co-based alloy.
신찬수,AlexahderWolff 한국정보과학회 2002 정보과학회논문지 : 시스템 및 이론 Vol.29 No.6
In this paper, we deal with the following facility location problem. Given a set P of n points in the plane, find two (discrete) centers p and q in P that minimize the sum of there distance plus the distance of any other point to the closer center. In this paper, we propose an O(n2logn)-time algorithm to compute the two centers. 본 논문에서는 기관위치설정 문제 중에서, 이차원 평면에 주어진 n개의 점들로 구성된 집합 P에 대한 이산 2-중심 문제를 다룬다. P의 있는 서로 다른 두 점을 중심으로 선택하는 데, P의 다른 점들은 두 중심 중에서 가까운 중심까지의 거리의 최대값과 두 중심 사이의 거리의 합이 최소가 되도록 선택하는 것이 목적이다. 본 논문에서는 O(n2logn) 시간에 이산 2-중심을 구하는 알고리즘을 제시한다.