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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%.
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.
강박성 성격특성을 가진 목회자의 탈진과 상담자의 개입 연구
김규식(Kyu-Sik Kim) 영남신학대학교 2010 신학과 목회 Vol.34 No.-
Passionate pastors are likely to experience burnout because of their obsessivecompulsive personality traits. It may be more desirable for a pastor to overcome the crisis of burnout than to live without burnout. It is because if a pastor is not able to manage his burnout problem properly, it may be fatal not only to the pastor himself but also to church members under his care. The objective of this study is to identify obsessivecompulsive personality traits causing pastors’ burnout and to find a direction for counselor’s intervention. We chose Elijah in the Bible as a representative person who experienced burnout, and suggested obsessivecompulsive personality traits as the causes of major burnout symptoms that he showed. The researcher’s intention to choose Elijah as a burnout model is to say that even such a great person as Elijah may experience burnout and his obsessivecompulsive personality is a major factor working behind the burnout. In order to suggest a direction of counselor’s intervention for burnout pastors, we looked for how God restored Elijah, and suggested a direction of counselor’s intervention based on the method used by God. The burnout problem is connected not only to psychological issues but also to spiritual issues. Nevertheless, this study tried to resolve psychological issues through counselor’s intervention by associating pastors’ burnout problem with their personality. This attempt was based on the report of Benner(2000) & Van Kaam(1996) that the settlement of psychological problems may be helpful to the resolution of spiritual issues and recovery. Lastly, the researcher suggested the education of professional counselors for promoting professional workshops and personal counseling and interventions to prevent pastors from burnout and to assist burnout pastors.
X60 고강도 저합금강의 미세조직 및 반복 변형거동에 미치는 합금 원소의 영향
김규식 ( Kyu Sik Kim ),김상식 ( Sang Shik Kim ),박광균 ( Kwang Kyun Park ),노경민 ( Kyoung Min Noh ),이기안 ( Kee Ahn Lee ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.9
Repeated deformation behaviors of 10 different X60 based steels were investigated in this study. At room temperature, repeated deformation tests were conducted with f=0.2 Hz, sinusoidal wave form and Δεta (total strain amplitude) = 0.9%, which are conditions similar to those for coiled tubing application. Different alloys whose microstructures were varied with addition of alloying elements showed different fatigue life. In particular, X60 steel modified by addition of titanium had superior fatigue properties than the base X60 steel. To clarify the relationship between repeated deformation life and microstructure, morphologies of the fractured surfaces and crack propagation path were examined. Most of the cracks propagated smoothly along the ferrite-ferrite interface or through the ferrite, while the crack path was largely changed by pearlite phases, which were relatively harder phases than ferrite. Based on those results, we related the microstructure parameters to repeated deformation behavior.
인성교육의 장으로서 생활관 기능 확장을 위한 방안 연구
김규식(Kyu-Sik Kim) 영남신학대학교 2016 신학과 목회 Vol.46 No.-
This study is about strategies for enhancing functions of residence as a field for character building education. As the residence in its characteristics is a space for students who lived a life with different culture, environment and values to interact one another, it can be the most appropriate place to maximize character building education of students by utilizing characteristics of residence if educational intention of college is to be reflected fully. The author took Alfred Adler’s individual psychology as a theoretical background for directions of character building education. In terms of individual psychology, human’s basic motives are regarded as the pursuit of belonging and community feeling, and because it may be correspond to the target of ultimate pursuits of character building education. Though character building education may be available for people in all ages, this study was in search of strategies for character building education centered on the residence applicable for undergraduate students who are in the early adult stage of development after high school graduation. In detail, this study discussed strategies for enhancing functions of the residence as directions of character education for them and a field of character education, and they are firstly, selection of freshman students through residence character education selection, secondly, development of curriculum focusing on the residence and thirdly, the relationship within the residence and establishment of care system. It is necessary to benchmark domestic dormitory models in pursuit of residential colleges. At the same time, in reference to education targets that foreign brand name universities have pursued for a long time, it is also necessary to constantly search for strategies to maximize functions of dormitory as a field of character building education appropriate for characteristics of our school.
인지행동적 부부훈련이 부부문제감소와 부부관계향상에 미치는 효과
김규식(Kyu Sik Kim),김성회(Seong Hoi Kim) 한국상담학회 2001 상담학연구 Vol.2 No.1
The purpose of this study was to examine the effect of the Cognitive Behavioral Training(CBT) on decreasing marital distress, and enhancing couple relationship. CBT was focused on decreasing couple dysfunctional behaviors and cognitions, and enhancing couple satisfaction and stability. In order to examine th effect of this training, two kinds of measuring scales were used, Marital Distress Scale(MDS) and Marital Relationship Scale(MRS). MDS had two subscales: Behavioral Marital Distress Scale(BMDS) measuring couple dysfunctional extent of reciprocity, communication skills, problem-solving, and anger expressions, and Coginitive Marital Distress Scale(CMDS) measuring the couple dysfunctional extent of perceptions, attributions, expectancies, assumptions, standards of marital distress. MRS had two subscales: Couple Satisfaction Scale(CSS) measuring the extent of couple satisfaction, and Couple Stability Scale(CSTS) measuring the extent of couple stability. The subjects in this study were 18 married volunteers who wanted to enroll in the training group. All subjects were trained for four 240 minute sessions for four weeks. All subjects received the pre-test, post-test, and followup-test seven weeks later by using the MDS and MRS. The conclusions obtained from the results and discussions of this research are as follows: 1.CBT was effective in decreasing behaviors of marital distress. 2. CBT was effective in enhancing couple relationship(couple satisfaction and couple stability).