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CMP 방법으로 제조한 BSCCO 2212 튜브의 임계전류특성에 미치는 열처리 온도의 영향
최정숙,오성룡,전병혁,김형섭,김혜림,현옥배,김찬중,Choi, Jung-Suk,Oh, Sung-Young,Jun, Byung-Hyuk,Kim, Hyoung-Seop,Kim, He-Lim,Hyun, Ok-Bae,Kim, Chan-Joong 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
[$Bi_2Sr_2Ca_1Cu_2O_x$](BSCCO 2212) tubes were fabricated by centrifugal melting process(CMP). BSCCO 2212 powder was melted in a Pt crucible and solidified in a rotating steel mold. The BSCCO 2212 tube samples separated from steel mold were heat-treated at $800^{\circ}C\;and\;810^{\circ}C$ in oxygen flow. The critical current($I_c$) of the samples was measured by transport measurement at 77K, and the microstructure was investigated by scanning electron microscope. The $J_c$ at 77K of the tubes heated treated at $800^{\circ}C\;and\;810^{\circ}C$ were 197 and 240 $A/cm^2$, respectively. It was observed that the plate like grains in BSCCO 2212 tube was more developed in the sample heat treated at $810^{\circ}C\;and\;800^{\circ}C$ heated tube. It is found that the critical current($I_c$) of the BSCCO 2212 sample was dependent on the heating schedule regarding the growth of the BSCCO 2212 grains.
최정숙,전병혁,현옥배,김찬중,Choi, Jung-Suk,Jun, Byung-Hyuk,Hyun, Ok-Bae,Kim, Chan-Joong 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2
$Bi_2Sr_2Ca_1Cu_2O_x$(BSCCO 2212) superconductors for current lead were fabricated by centrifugal melting process(CMP). BSCCO 2212 powder was melted at $1200^{\circ}\C$ in a resistance furnace using a Pt crucible and poured in a rotating cylindrical mold preheated at $550^{\circ}\C$ for 2 hour. The solidified BSCCO-2212 samples were heat-treated by partial melting process in oxygen atmosphere. The current-voltage curves at 77 K of the samples were obtained by transport measurement, and the microstructure was investigated by scanning electron microscope. The $J_c$ values at 77 K of the tubes partially melted at $840^{\circ}C,\;860^{\circ}C\;and\;880^{\circ}C$ were 492, 430 and 398 $A/cm^2$, respectively. It was observed that the plate-like grains in BSCCO 2212 tube was more developed in the sample heat-treated at $840^{\circ}C$. It was found that the critical current of the BSCCO 2212 samples was dependent on the partial melting schedule regarding the grain shape and size of the BSCCO 2212.
Al 식각정지층을 이용한 Nb-based SNS 조셉슨 접합의 제조공정
최정숙,박정환,송운,정연욱,Choi, J.S.,Park, J.H.,Song, W.,Chong, Y. 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2
We report our efforts on the development of Nb-based non-hysteretic Josephson junction fabrication process for quantu device applications. By adopting and modifying the existing Nb-aluminum oxide tunnel junction process, we develop a process for non-hysteretic Josephson junction circuits using metal-silicide as metallic barrier material. We use sputter deposition of Nb and $MoSi_2$, PECVD deposition of silicon oxide as insulator material, and ICP-RIE for metal and oxide etch. The advantage of the metal-silicide barrier in the Nb junction process is that it can be etched in $SF_6$ RIE together with Nb electrode. In order to define a junction area precisely and uniformly, end-point detection for the RIE process is critical. In this paper, we employed thin Al layer for the etch stop, and optimized the etch condition. We have successfully demonstrated that the etch stop properties of the inserted Al layer give a uniform etch profile and a precise thickness control of the base electrode in Nb trilayer junctions.
프랙탈의 고등학교 수학교육과정에서의 도입가능성에 관한 연구
최정숙,신인선 ( Jung Suk Choi,In Sun Shin ) 한국수학교육학회 1998 수학교육 Vol.37 No.1
We seek the possibility of introduction of Fractals to the high school math. curriculum through identifying Fractals teaching programs appropriate for the scopes and sequences in math. education for the high school students. We presented the contents of Fractal theory suitable for the high school students. The following subjects were chosen to be introduced; self-similarity, Fractal dimension, Cantor set, Sierpinsky triangle, Sierpinsky carpet, Koch curve, Koch island, perimeter estimate of rugged profiles drawn on paper, and chaos game. We developed the working papers and the criteria for appraisal. Each working paper focuses on the activities in which students can solve the given problems, understanding the characteristics and ideas of Fractals. The working papers were given to the second year students who take science course, and the degree of achievements were analyzed based on the appraisal criteria. The results show that it is possible to introduce Fractals to the high school students
중년기부부를 대상으로 하는 가족레질리언스 강화 프로그램 개발 연구
최정숙 ( Jung Sook Choi ) 한국가족사회복지학회 2009 한국가족복지학 Vol.27 No.-
The purpose of this study was to develop a program for middle-aged couples for enhancing family resilience. Based on the literature review of middle-aged couples and applying the conceptual framework of `Family Resilience` by Walsh, a program focused on belief system, organizational pattern, and communication process was designed and implemented. The program was applied to ten middle aged persons for four (3hours/session/week) sessions. The Wilcoxon Signed Ranks test was used to compare the pre and post effects of the program. The evaluation of the program participants were analyzed. The pre and post comparative analysis showed a significant enhancement in belief system, organizational pattern, communication process, and dyadic adjustment. The effectiveness of the program was also reinforced by the results of the participants` evaluation. The 3 hour/ 4 session program was appropriate in terms of program format in regard to the accessibility of the participants. Co-execution of an individual couples` session was also proposed for an in-depth approach. This study offers a hands-on practice tool for the practionioner in providing an effective family resilience enhancement program for the middle-aged couples.
최정숙(Choi, Jeong-suk) 국제언어문학회 2020 國際言語文學 Vol.- No.47
이 논문의 목적은 미당 서정주 시의 제의성 분석을 통해 미당의 시 문학에 내재해 온 상상력의 또 한 층위를 조명해 보고자 한다. 구체적으로 후기 시집 『질마재 신화』와 『서정주 문학전집』에 수록된 시 중에서 시적 화소가 질마재라는 문학공간에서 어떠한 상징적 변용을 이루어 나아갔는지를 형상화 과정에 주목하여 탐색하고자 한다. 특히 변형과정의 원형성은 삼국유사나 마을의 전설에서 드러나는 주술성을 기반으로 한 서사성을 중시하였다. 이러한 문학공간으로서 질마재는 가상현실(VR)이나 증강현실(AR) 같은 영상기술(CT)과 접목하여 문학교육의 효용성 제고에도 주목하였다. 이러한 원형 비평적 관점은 신화나 무속에서 신이나 정령과 직접 동기 감응하고 그 사이에 신탁(神託)과, 예언, 병치레를 포함한 여러 가지 의례를 행하는 주술 행위를 하는 종교적 직능자인 샤먼에 기반 한다. 미당의 시는 그 원형적 의미에서의 샤머니즘과 주원의 시적 이미저리를 문학적으로 형상화해 냈다는 점에서 담론의 의미가 자리매김을 할 수 있다. 질마재의 세계에서는 신과 인간의 소통은 결국 질마재를 매개로 이루어진다. 더 나아가 인간 전체의 소통으로 이어진다. 미당의 시에서 민간신앙적인 시적 제재는 과거와 현재를 시적인 영감으로 징검다리 역할을 하였다. 아울러 그 요소는 샤머니즘적인 문화공동체적 삶의 모습으로 형상화되고 있다. 이 연구가 미당 시의 제의성 연구의 폭을 확장시키는데 자그마한 기여가 되기를 기대한다.
여성결혼이민자의 임파워먼트를 위한 미술활동활용 집단프로그램 연구
최정숙 ( Jung Sook Choi ),오지영 ( Jie Young Oh ) 한국가족사회복지학회 2011 한국가족복지학 Vol.33 No.-
The purpose of this study was to develop a group art activity program for empowerment of the female marriage immigrants. Based on the literature review of female marriage immigrants, empowerment, and group art activity, a program was designed and implemented. The program was applied to six female marriage immigrants for ten (2hours/session) sessions. The Wilcoxon Signed Ranks test was used to compare the pre and post effects of the program. Also, program participant`s evaluation was performed. The pre and post comparative analysis showed a significant enhancement in self-efficacy and problem-solving. Social support showed a strong tendency for improvement without statistical significance. The results of participant`s evaluation also reinforced the effectiveness of the program. The significance of this study is to provide a program for empowerment of the female marriage immigrants.