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분말법과 주조법으로 제조한 coated conductor용 Ni 기판 개발
임준형,김정호,김규태,장석헌,주진호,나완수,홍계원,지봉기,김찬중 한국초전도학회 2003 Progress in superconductivity Vol.5 No.1
We fabricated cube textured Ni substrate for YBCO coated conductor and evaluated the effects of processing parameters on microstructural evolution and texture formation. Ni-rods as an initial specimen were prepared by two different methods, i.e., powder metallurgy(PM) and plasma arc melting(PAM). Subsequently, the rods were cold rolled to 100 $\mu\textrm{m}$ thick substrate and annealed at temperatures of $700∼1200^{\circ}C$. The texture of the substrate was characterized by pole-figure. It was observed that the texture of substrate made by P/M did not significantly varied with annealing temperature of 600∼$l100^{\circ}C$ and the full-width at half-maximums (FWHM) of both in-plane and out-of-plane were 9$^{\circ}$∼$10^{\circ}$. On the other hand, the texture of substrate made by PAM was more dependent on the annealing temperature and the corresponding values were $9^{\circ}$ ∼$13^{\circ}$ at the temperature range. In addition, recrystallization twin texture, (221)<221>, was formed as the temperature increased further. OM profiles showed that the grain size of substrate made by P/M was smaller than that made by PAM and this difference was correlated to the microstructure of initial specimens.
Y<sub>2</sub>Ba<sub>1</sub>Cu<sub>1</sub>O<sub>x</sub>공정을 이용한 TFA-MOC YBCO 박막 공정 개발
임준형,장석헌,김규태,이진성,윤경민,하홍수,주진호,나완수,Lim, Jun-Hyung,Jang, Seok-Hern,Kim, Kyu-Tae,Lee, Jin-Sung,Yoon, Kyung-Min,Ha, Hong-Soo,Joo, Jinho,Nah, Wansoo 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.2
YBCO film was synthesized by using a new approach to the TFA-MOD method. In the fabrication process, $Y_2Ba_1Cu_1O_x\;and\;Ba_3Cu_5O_8$ powders were used as precursors (the so called '211 process'), instead of Y-, Ba-, and Cu-based acetates, and dissolved in trifluoroacetic acid followed by calcining and firing heat treatment. Consequently, we successfully fabricated YBCO film and evaluated the phase formation, texture evolution, and critical properties as a function of the calcining and firing temperature and humidity, in order to explore its possible application in coated conductor fabrication. The films were calcined at $430-460^{\circ}C$ and then fired at $750-800^{\circ}C\;in\;a\;0-20\%$ humidified $Ar-O_2$ atmosphere. We observed that $BaF_2$ phase was effectively reduced and that a sharp and strong biaxial texture formed under humidified atmosphere leading to increased critical properties. In addition, we found that the microstructure varied significantly with the firing temperature: the grain grew further, the film became denser, and the degree of texture and phase purity varied as the firing temperature increased. For the film fired at $775^{\circ}C$ after calcining at $460^{\circ}C$, the critical current was obtained to be 39 A/cm-width (corresponding critical current density is $2.0\;MA/cm^2$ which was probably attributed to such factors as the enhanced phase purity and out-of-plane texture, the moderate film density and grain size, and crack-free surface.
민관 파트너십 중심의 지역개발과 중재집단의 역할 - 피츠버그 기술센터 오염부지 재활용 사례를 중심으로 -
임준형,명성준 한국자치행정학회 2014 한국자치행정학보 Vol.28 No.4
본 연구는 미국 피츠버그시의 브라운필드 재개발사업 사례를 통해 오염부지 재개발과정을 살펴보고, 개발사업에 주요한 영향을 미치는 사건 및 정책행위자를 찾고 이들의 역할을 고찰하는 것을 목적으로 한다. 피츠버그 기술센터 사례는 사용되지 않은 오염된 철강공장 부지를 정화하고 연구개발에 종사한 기술관련 회사들이 입주하는 산업단지를 건설하였다. 당시 Murphy시장은 이 지역에 오랫동안 관심을 가졌던 정치인으로서 적극적인 리더십을 발휘하였다. 아울러 쇠락해가는 지역을 부흥시키기 위해 설립된 피츠버그 도시재개발공사는 개발과정에 적극적으로 참여하며, 개발에 필요한 각종 연구는 물론 이해관련자들간의 갈등 중재 등의 역할을 수행하며 민관협력 방식으로 개발사업을 주도해나갔다. 상충되는 연방정부와 지방정부의 법제도, 다양한 주민 의견 및 배경, 이해관련자들간의 갈등과 같은 오염부지 재개발 사업이 가진 내재적 어려움을 극복하는데 도시재개발공사 및 정치적 리더십이 중요한 역할을 담당하였다. This paper conducts a case study about a brownfield redevelopment project in Pittsburgh, PA, USA. The case study is to observe how the project is proceeded and to define the roles of key events and policy actors during the process. The city of Pittsburgh built the Pittsburgh Technology Center by cleaning-up an old abandoned industrial site which is filled with toxic chemicals from old steel mills. Contributing factors include the active leadership from Mayor Murphy and the role as a coordinator of Urban Redevelopment Authority. Urban Redevelopment Authority led the public-private partnership approach, taking active part in development process and negotiating a diversity of actors with differing opinions. The Authority played crucial roles in overcoming discrepancy between federal and local regulations, differing opinions of citizens, conflict among stakeholders.