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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.
이하선 부위에 발생한 Angiolymphoid Hyperplasia with Eosinophilia
김규식,노혜일,오현진,천병준,조정해,강석진,Kim, Que-Chic,Noh, He-Il,Auo, Hyeon-Jin,Chun, Byung-Joon,Cho, Jung-Hae,Kang, Seok-Jin 대한기관식도과학회 2002 大韓氣管食道科學會誌 Vol.8 No.2
Angiolymphoid hyperplasia with eosinophilia(ALHE) is an uncommon idiopathic condition that presents with isolatedor grouped cutaneous plaques or nodules of the head and neck. Extracutaneous involvement is rare. ALHE is a distinct pathologic entity marked by a proliferation of blood vessels with distinctive large endothelial cells accompanied by a characteristic inflammatory infiltrate that includes eosinophils. The lesion is benign but may be persistent and difficult to eradicate. The authors have recently experiecned a case of angiolymphoid hyperplasia with eosinophilia in a 52-year-old male who had a painless enlarging mass in his right preauricular area and external ear canal for several years. We present this case with the review of literatures.
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%.
김규식(Gyu-Sik Kim),이병석(ByungSeok Lee),이준화(JoonHwa Lee),김조천(Jo-Chun Kim) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
본 논문에서는 하루에 수백만 명이 이용하는 지하철 역사내의 환경 관리를 유비쿼터스(Ubiquitous) 기술을 적용하여 실질적이고 효과적으로 실행하는 방안을 재안하고자 한다. 지하철 역사는 지하라는 특수한 환경이기 때문에 외부의 신선한 공기를 유입하여 역사내의 공기질을 쾌적하게 유지해야할 필요가 있다. 또한 실내 공기질을 오염시키는 환경가스나 미세먼지 등의 오염도에 대해서도 지속적으로 감시하여야 한다. 이를 위해 설치가 간편하고 소형의 측정 장치를 지하역사내의 주요 지점에 설치하여 오염 물질을 측정하고 그 결과 데이터를 모으는 집중기(Collector)를 운영하여 최종적으로 측정 데이터를 중앙 서버까지 전송할 수 있다면 지하철 관리자에 의한 지하역사내의 오염물질을 효과적으로 관리 · 감독하는 종합적인 지하철 환경 관리시스템의 운영이 가능할 것으로 판단된다.
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.
김규식(Gyu-Sik Kim),오준태(Joon-Tae Oh),김조천(Jo-Chun Kim) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
본 연구에서는 비분산 적외선 방식을 이용한 일산화탄소, 이산화탄소 듀얼 센서 모듈을 실현한다. 비분산 적외선 방식은 가스분자가 특정 파장의 적외선을 흡수하는 특성을 이용하여 가스의 적외선 흡수도를 측정하여 농도로 환산하는 방식이다. 비분산 적외선 방식은 수명이 길고 정밀도가 높아 기존의 접촉식(화학식) 센서에 비해 우수한 특성을 가지고 있다. 중요한 기술은 NDIR의 핵심 부분인 광 공동의 설계 기술과 센서의 성능을 최종 결정짓는 농도온도 교정 기술이다. 현재까지 개발된 광공동 기술은 CO₂센서의 단일 센서 방식이었다. 본 연구에서는 이 기술을 접목한 일산화탄소까지 동시에 측정할 수 있는 광 공동기술과 교정기술을 연구개발하여 하나의 광 공동으로 이산화타소와 일산화탄소를 동시에 측정 할 수 있는 고기능 센서를 실현하는 것이다.