• Proceedings of the KIEE Conference
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• summer
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• pp.776-778
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• 2004

In this paper, we present effect of the stacked HTS tapes. AC losses of HTS pancake windings with stacked tapes are shown. Magnetic flux density in the HTS winding under operating conditions was calculated by FEM. AC loss of the pancake winding were measured and compared with the calculated loss by using AC losses of the stacked samples. Test results show that measured results generally agreed well with the calculated value by using AC loss of 4-stacked sample data.

• Proceedings of the KIEE Conference
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• summer
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• pp.1010-1012
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• 2004

AC loss is an important factor in the development of superconducting tapes and superconducting power applications. In this paper we measured and compared characteristics of BSCCO tape and YBCO Coated Conductor(YBCO CC). BSCCO tape was fabricated by PIT method. We measured critical current density and transport current loss of it. Also, YBCO CC tape consist of substrate. buffer, YBCO and metal layers. We measured critical current density on variations of external magnetic field and transport current loss of these cases. The results of measurement show that normalized critical current of YBCO CC is smaller then that of BSCCO tape in the external magnet field. According to the results. measured loss and calculated of the YBCO CC show the same tendency.

• Electrical & Electronic Materials
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• v.5 no.2
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• pp.175-181
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• 1992

Y-Ba-Cu-O계 보다 화학적 내구성이 좋은 Bi-Sr-Ca-Cu-O계 초전도체 wire를 중합 binder와 초전도체 파우더를 혼합하여 sol-gel법으로 제조하였다. 여러가지 혼합비와 열처리 조건하에서 제조한 wire의 특성분석 결과 Bi$_{2}$Sr$_{2}$Ca$_{2}$Cu$_{3}$O계 초전도체와 binder의 최적 혼합율은 22.25%이었고 가열비는 0.33.deg.C/min로 500.deg.C까지는 Ar gas와 $O_{2}$ gas분위기로 열처리하고 500.deg.C에서 835.deg.C까지는 $O_{2}$ gas분위기에서 40h동안 열처리하였을때 임계온도 98K를 갖는 초전도 선재를 얻을 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.307-310
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• 2004

전기영동전착법을 이용한 초전도 후막선재의 제작은 제작 장치와 공정이 간단하고 두께제어 및 다양한 형태의 초전도 막과 선재 제작이 가능한 경제적 효율성과 기술적 장점을 가지고 있다. 따라서 초전도 후막의 특성향상을 위하여 전착공정 과정에서 입자의 치밀성 및 배향성 향상을 위한 칙적화 방안과, 건조 및 열처리 과정에서 발생되는 크랙 및 기공현상과 같은 문제점을 극복 할 수 있는 균일한 후막 표면 화보에 관한 비교 분석 연구를 수행하였다. 전기영동전착법에 의한 초전도후막 제작을 위한 조건 중 현탁용매 조건에 대한 최적화를 구현함으로써 전착 불균일성에 따른 초전도 특성 저하요인인 후막표면의 기공과 크랙현상을 최소화하였다. 전기영동 전착법에 의한 초전도 후막의 특성을 향상시키기 위한 제작 방법으로 각 용매별에 따른 안정화된 제작 조건을 구현하였다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.5
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• pp.155-160
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• 2018

The materials used for 3D printing are mainly plastic and metal. These materials are usually used in the powdered form. In order to improve the surface roughness of a manufactured product, these powders should consist of small uniform spherical particles. However, the powdered forms are sold at a considerably higher price than bulk or wired materials. When a wire-type material is used instead of a powder, we can supply a relatively large amount of the material at one time as well as reduce the cost. Moreover, the use of this form of the material will increase the process efficiency. This paper deals with the technology required to feed a wire material in front of the tool movement and discusses the examples used for the verification.

• Progress in Superconductivity and Cryogenics
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• v.9 no.1
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• pp.57-60
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• 2007

Superconducting electric power devices need to stack HTS wires to increase the current carrying capacity. Uniform multi-stacked wires(UMS) which were made of the same HTS wires have been used. This paper shows the magnetization loss of hybrid multi-stacked(HMS) wire made of BSCCO wires and YBCO wires. Five HMS wires, YB(YBCO-BSCCO), YYBB. YBYB, YBBY and BYYB, were made and tested. Magnetization losses of each UMS wire were compared with corresponding HMS wire. Test results show that magnetization losses per unit length of HMS wire are between the corresponding UMS BSCCO wire and HMS YBCO wire below critical magnetic field. Above the critical magnetic field, magnetization losses of HMS wires are larger than that of corresponding both VMS wires.

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.05a
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• pp.104-104
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• 2002

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.05a
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• pp.103-103
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• 2002

• Proceedings of the Materials Research Society of Korea Conference
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• 1999.11a
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• pp.35-35
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• 1999

• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.428-430
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• 2006