• Proceedings of the Korean Nuclear Society Conference
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• 2005.10a
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• pp.247-248
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• 2005

• Korean Journal of Materials Research
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• v.5 no.7
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• pp.880-887
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• 1995

Melt spun YB $a_2$C $u_3$A $g_{15}$ and YbB $a_2$C $u_3$A $g_{x}$(x=5, 16 and 53) precursor alloy ribbons were oxidized at 263~322$^{\circ}C$, and heat-treated at 872~89$0^{\circ}C$ under 1.0atm oxygen pressure. In addition, about ten ribbons were stacked and coupled by pressing, and then followed the same heat treatment. YB $a_2$C $u_3$ $O_{7-{\delta}}$(1-2-3) or YbB $a_2$C $u_3$ $O_{7-{\delta}}$(1-2-3) phase was formed in both the ribbons and the multilayered specimens. The formed 1-2-3 phases were not texturized in all the ribbons, but slightly texturized in the multilayered specimens. $J_{c}$ was not achieved in all the ribbons at 77K and zero magnetic field. Among the multilayered specimens, YB $a_2$C $u_3$A $g_{15}$ and YbB $a_2$C $u_3$A $g_{16}$ showed $J_{c}$ of 260 and 180A/$\textrm{cm}^2$, respectively. YB $a_2$C $u_3$A $g_{15}$ and YbB $a_2$C $u_3$A $g_{16}$ are considered to be the appropriate compositions in producing textured superconducting oxides with improved $J_{c}$ by pressing. Onset critical temperature ( $T_{on}$ ) of the multilayered YB $a_2$C $u_3$A $g_{15}$ was 92K while those of YbB $a_2$C $u_3$A $g_{x}$(x=5 , 16 and 53) were 88~90K. , 16 and 53) were 88~90K.

• Journal of the Korean Vacuum Society
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• v.7 no.s1
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• pp.179-182
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• 1998

Boron carbide coating has some very attractive properties for nuclear and semiconductor industry. The potential of atmosheric plasma spray as manufacturing methods for $B_4C$ coating was discussed. In this work, the boron carbide coating with low porosity, high microhardness and good life of thermal shock resistance was deposited by the control of spraying distance. The relationship between the properties of $B_4C$ coatings and their spraying distance was studied.

• Journal of the Korean Mathematical Society
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• v.56 no.1
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• pp.67-80
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• 2019

For positive integers a, b, c, and an integer n, the number of integer solutions $(x,y,z){\in}{\mathbb{Z}}^3$ of $a{\frac{x(x-1)}{2}}+b{\frac{y(y-1)}{2}}+c{\frac{z(z-1)}{2}}=n$ is denoted by t(a, b, c; n). In this article, we prove some relations between t(a, b, c; n) and the numbers of representations of integers by some ternary quadratic forms. In particular, we prove various conjectures given by Z. H. Sun in [6].

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.10a
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• pp.511-512
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• 2012

• Proceedings of the Korean Nuclear Society Conference
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• 2004.10a
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• pp.225-226
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• 2004

• Proceedings of the Korean Vacuum Society Conference
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• 2003.08a
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• pp.173-173
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• 2003

• Proceedings of the Korean Vacuum Society Conference
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• 2007.08a
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• pp.382-382
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• 2007

• Electronics and Telecommunications Trends
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• v.22 no.5
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• pp.78-85
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• 2007

최근 핸드폰 및 정보통신기기가 급속도로 발전함에 따라 그 핵심 부품이라 할 수 있는 비메모리 반도체의 발전이 최대 관심사로 떠오르고 있다. 비메모리 반도체를 대표하는 SoC의 발전은 한 국가의 정보통신 발전 및 국가 경제에 지대한 영향을 미친다고 볼 수 있다. 삼성전자로 대표되는 메모리 위주의 우리나라 반도체 산업도 지난 몇 년간 SoC를 개발하는 국내 팹리스 업체들에 의해 많이 발전하였다. 그럼에도 불구하고, 세계적으로 블루오션 시장으로 각광 받고 있는 SoC의 필수 요소인 IP 시장의 경우, 현재 국내에서는 불모지나 다름 없다. 이에, 본 고에서는 세계 IP 시장의 현 상황을 분석해 보고 국내 팹리스 업체의 SoC 개발 현황과 IP의 활용도를 알아보도록 한다. 또한, 국내 IP 시장의 활성화를 위한 정부 지원 프로그램을 알아보고, 개발 및 시장 활성화를 위한 방안을 찾아보고자 한다.

• Korean Journal of Materials Research
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• v.8 no.11
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• pp.1026-1030
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• 1998

Thermal properties of Fe- base amorpous alloys were investigated. $Fe_{80}P_6C_{12}B_{12}$ and $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ amorphous alloys were fabricated by melt spinning method and thermal analysis was done by differential scanning calorimeter. After isothermal crystallization. the Avrami exponents of $Fe_{80}P_6C_{12}B_{12}$ and $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ amorphous alloys were 1.8-2.2 and 2.5-4.0, respectively. It means the former alloy shows diffusion controlled growth and the latter one shows interface controlled growth. For $Fe_{80}P_6C_{12}B_{12}$ and $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ amorphous alloys. the activation energies of isothermal crystallization was 353 and 371kJlmol. Also the activation energies of nucleation and growth were 301, 324kJlmol and 273. 30lkJ/mol, respectively. Thus $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ amorphous alloy is considered to be more stable than $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ amorphous alloy.