• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.222-223
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• 2000

희토류 (또는 란탄족) 원소들은 주기율표상에 원자 번호 57번부터 71번까지 15종의 원소들의 총칭이다. 일부 희토류 원소는 감속재를 비롯한 원자로의 재료로 사용되고 있으며, 대부분의 희토류 원자 스펙트럼은 원자력 발전소에서 사용한 연료의 폐기물 처리에 관련된 각종 연구에 이용되고 있다. 따라서 이 원소들에 대한 원자 분광학적 연구는 원자력 산업 응용 분야에서 중요하게 인식되고 있다. 특히, 레이저를 이용한 분광학적 기술은 이 원소들의 정량 분석에 있어 주성분과 비교적 적은 양 및 극미량 수준의 시료 분석에 가장 유용하게 이용되고 있다. (중략)

• Journal of radiological science and technology
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• v.9 no.1
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• pp.83-87
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• 1986

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.61-64
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• 1988

This paper deals with some aspects for the design of induction servomotors with respect to permanent magnet servomotors and standard induction motors as control components. Induction servomotors have much lower weight and moment of inertia than the DC servomotor but cannot reach the excellent values of a brushless DC servomotor with rare earth magnets.

• Journal of Magnetics
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• v.6 no.4
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• pp.142-144
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• 2001

A method to deduce the rotational magnetization curve from experimental magnetization of partially aligned uniaxial anisotropy system has been investigated. The curve obtained by this process has been evaluated quire close to the theoretical magnetization curve compared to that obtained by linear extrapolation from high field data. This new approach offers better accuracy for the determination of magnetic anisotropy by fitting a calculated magnetization curve to the obversed one.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.712-713
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• 2006

We successfully developed Al-Si-Transition Metal (TM) -Rare Earth (RE) Powder Metallurgy (P/M) alloy with fine microstructure, which has high strength at high temperature. This material was compacted rapidly solidified powder and directly consolidated by hot extruding or forging. Before consolidating, rapid heating was performed on powder compaction in order to keep the fine microstructure in powder state. We have also investigated the processing conditions of this new alloy by computing simulations and experiments.

• Journal of the Korean Chemical Society
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• v.14 no.3
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• pp.257-261
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• 1970

Some factors such as the weight ratio, reaction time and temperature for the separation of rare earth elements from monazite are studied. The influence of the inorganic phosphate for the leaching is also studied.

• Journal of the Korean Ceramic Society
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• v.28 no.3
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• pp.252-258
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• 1991

Spectral properties of europium activated intermediate compounds in the system R2O3-P2O5(R=La, Y, and Gd) are presented, including also phosphors with bismuth and vanadate sensitization. The sensitized phosphors are less efficient than unsensitized phosphors. (The ratio of oxygen to phosphorus effects the charge transfer band) Most phosphors have low efficiencies, but La3PO7 and Gd3PO7 hosts are possible for commercial luminescent materials.

• Journal of the Korean Chemical Society
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• v.55 no.6
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• pp.1000-1006
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• 2011

A systematic study of Knoevenagel reaction and Nazarov cyclization was made on variety of less reactive carbonyl compounds such as ${\beta}$-ketoesters, 1,3-diketones and cyclic active methylene compounds using $Yb(OTf)_3$ as the catalyst. Recycling study confirms reusability of the catalyst without much loss of activity.

• Bulletin of the Korean Chemical Society
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• v.34 no.5
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• pp.1579-1582
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• 2013

• Proceedings of the Korean Magnestics Society Conference
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• 2015.11a
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• pp.178-178
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• 2015