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분말 합금법으로 제조된 Fe-Cr-Al 금속 다공체의 구조, 미세조직 및 기계적 특성
김규식,강병훈,박만호,윤중열,이기안,Kim, Kyu-Sik,Kang, Byeong-Hoon,Park, Man-Ho,Yun, Jung-Yeul,Lee, Kee-Ahn 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.1
The Fe-22wt.%Cr-6wt.%Al foams were fabricated via the powder alloying process in this study. The structural characteristics, microstructure, and mechanical properties of Fe-Cr-Al foams with different average pore sizes were investigated. Result of the structural analysis shows that the average pore sizes were measured as 474 ㎛ (450 foam) and 1220 ㎛ (1200 foam). Regardless of the pore size, Fe-Cr-Al foams had a Weaire-Phelan bubble structure, and α-ferrite was the major constituent phase. Tensile and compressive tests were conducted with an initial strain rate of 10<sup>-3</sup>/s. Tensile yield strengths were 3.4 MPa (450 foam) and 1.4 MPa (1200 foam). Note that the total elongation of 1200 foam was higher than that of 450 foam. Furthermore, their compressive yield strengths were 2.5 MPa (450 foam) and 1.1 MPa (1200 foam), respectively. Different compressive deformation behaviors according to the pore sizes of the Fe-Cr-Al foams were characterized: strain hardening for the 450 foam and constant flow stress after a slight stress drop for the 1200 foam. The effect of structural characteristics on the mechanical properties was also discussed.
수증기 메탄 개질 반응을 이용한 수소 생산용 Ni-Cr-Al 다공체 지지 촉매의 제조, 기계적 안정성 및 수소 환원 효율
김규식,강태훈,공만식,박만호,윤중열,안지혜,이기안,Kim, Kyu-Sik,Kang, Tae-Hoon,Kong, Man Sik,Park, Man-Ho,Yun, Jung-Yeul,Ahn, Ji Hye,Lee, Kee-Ahn 한국분말재료학회 (*구 분말야금학회) 2021 한국분말재료학회지 (KPMI) Vol.28 No.3
Ni-Cr-Al metal-foam-supported catalysts for steam methane reforming (SMR) are manufactured by applying a catalytic Ni/Al<sub>2</sub>O<sub>3</sub> sol-gel coating to powder alloyed metallic foam. The structure, microstructure, mechanical stability, and hydrogen yield efficiency of the obtained catalysts are evaluated. The structural and microstructural characteristics show that the catalyst is well coated on the open-pore Ni-Cr-Al foam without cracks or spallation. The measured compressive yield strengths are 2-3 MPa at room temperature and 1.5-2.2 MPa at 750℃ regardless of sample size. The specimens exhibit a weight loss of up to 9-10% at elevated temperature owing to the spallation of the Ni/Al<sub>2</sub>O<sub>3</sub> catalyst. However, the metal-foam-supported catalyst appears to have higher mechanical stability than ceramic pellet catalysts. In SMR simulations tests, a methane conversion ratio of up to 96% is obtained with a high hydrogen yield efficiency of 82%.
웹 브라우저의 고속 실행을 위한 뉴 메모리 기반 캡처 기법
김규식 ( Kyu-sik Kim ),김태석 ( Tae-seok Kim ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
본 논문에서는 웹 브라우저의 사용자 응답성을 개선하기 위해 뉴 메모리를 활용하는 기법을 제안한다. 프레임버퍼에 저장된 기본 웹 페이지의 실행 화면을 뉴 메모리에 캡처하고, 이를 웹 브라우저 실행 시 그대로 복원함으로써 사용자가 체감하는 웹 브라우저의 응답성을 크게 개선한다. 또한 제안하는 기법을 뉴 메모리 에뮬레이션 보드에 직접 구현하여 그 성능을 검증하고자 한다.
김규식(Kyu-Sik Kim) 영남신학대학교 2014 신학과 목회 Vol.42 No.-
The purpose of this study was to find strategies for characterizing the Department of Christian Education. That Christian education exists as an independent academic department in theological universities and seminaries basically assumes that it has an identity essentially different from theology and that, as a part of social science, it has its own color distinguished from the Department of Education. Of course, this color can be expressed specifically through the characterization of the academic department, but the characterization should be preceded by the establishment of the ideal image of a capable person pursued by the Department of Christian Education. It is because, although the professors in the department are diverse in major and teaching method, such an ideal image of a capable person sought by the department can be a common denominator that bring forth unity under the big umbrella of Christian education. In order to establish the ideal image of a capable person pursued by the Department of Christian Education, first of all, this study analyzed the educational purposes and goals of the department and derived three images: one who has a healthy character; one who has a spiritual identity as a Presbyterian Christian; and one who has specialties in the practice of Christian education. Second, this study suggested areas for the characterization of the Department of Christian Education, and the basic premises for the discussion were: that it is compatible with the regional characteristics of the Yeongnam region; that it is feasible; and that it is agreeable to the professors, students, and alumni of the school. As a result, three areas were suggested according to the developmental stage, which are specialists in education, teachers of Christian alternative schools, and specialists in Christian home education. Lastly, this study proposed strategies for the characterization of the department including connection to field works for building education systems, establishment of certification systems, improvement in curriculums, follow-up of graduates, fund raising for characterization, and MOUs with similar academic departments in foreign countries.
김규식(Kyu-Sik Kim) 영남신학대학교 2011 신학과 목회 Vol.36 No.-
As marriage is an institution established by God, there is God's intention in marriage. Husbands and wives should pursue satisfaction and happiness through their marriage life, but human satisfaction and happiness cannot be the essence of marriage. Nevertheless, husbands and wives pursue satisfaction and happiness as crucial conditions of their marriage life mainly because churches have neglected value education on the essence of marriage. The seriousness of contemporary marital distress is looming as a crisis of churches consisting mainly of families. The collapse of a family through divorce is a crisis not only to the family but also to the church. The present researcher assumed that marital distress and divorce are caused by the absence of marital education in churches, and wrote this thesis in order to emphasize that churches should carry out actively marital education based on Christian values. The purpose of this study was to find core values for marital education in Martin Luther's view on marriage. There have been many studies on Luther in Korea, but few of them were about his ideas on family and marital relationship. Thus, this study is expected to trigger various subsequent studies on Luther's understanding of family and husband wife relationship. The researcher analyzed Luther's view on marriage from the viewpoint of God's gift and secularity, and divorce from the viewpoint of God's love and forgiveness. In addition, this study suggested two conditions for maintaining marital stability, which are the vocation of serving the spouse based on God's calling and the office as a pastor and teacher for parenting. Based on the results of this study, lastly, the researcher sorted out and presented core values for church based marital education. Marital education based on the results of this study is expected to have a positive effect on husbands and wives' faith oriented thinking and their enhanced marital satisfaction and stability.