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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%.
김규식(Kyu-Sik Kim),강연준(Yeon June Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this paper, a new method for identifying the joint properties from the measured FRFs of an assembled system and its substructures is presented. All of parameters of the joint system should be taken into consideration in a model for the joint, because the dynamic behaviours of the assembled system can be generally affected by all parameters at its joint. In order to comprehensively identify all parameters of joint system, a new substructure synthesis algorithm with a flexible joint model based on FRF data has been developed, and then the joint identification technique based on this new algorithm is introduced here. The validation of the identification and coupling method is conducted by using various beams combined with bolted joints. Results show that the FRFs of assembled structure can be estimated accurately by using the proposed coupling method with joint effect obtained from the proposed identification technique.
비소세포폐암 환자의 혈장 DNA를 이용한 Microsatellite 분석
김규식 ( Kyu Sik Kim ),김은정 ( Eun Jung Kim ),김수옥 ( Soo Ock Kim ),오인재 ( In Jae Oh ),박창민 ( Chang Min Park ),정주연 ( Ju Yeon Jeong ),김유일 ( Yu Il Kim ),임성철 ( Sung Chul Lim ),박종태 ( Jong Tae Park ),김영철 ( Young Ch 대한결핵 및 호흡기학회 2005 Tuberculosis and Respiratory Diseases Vol.58 No.4
전문상담사 자격검정제도 개선을 위한 국외의 주요 자격제도 연구
김규식(Kyu-Sik Kim) 영남신학대학교 2015 신학과 목회 Vol.44 No.-
The purpose of this study was to study the counseling-related certification systems of representative associations in the U.S. and Canada in order to get implications for improving the counseling specialist certification system operated by the Korean Counseling Association. Ideas obtained from this study are as follows. the Korean Counseling Association needs to make efforts to enhance the benefits of the members who acquired the counseling specialist certificate. Specifically, it is necessary to introduce the liability insurance system for protecting the members from legal problems, property loss and damage, and health-related problems that may happen while providing counseling services. Furthermore, the Korean Counseling Association should publicize the expertise of counseling specialists among insurance companies so that counseling fees charged by counseling specialists may be covered by insurance as in extended health care insurance or accident insurance. It is necessary to establish counseling ‐related undergraduate and graduate curriculums and training courses at institutions certified by the Korean Counseling Association and to give a fast-track certificate to those graduating from the institutions, and to allow those with an equivalent domestic or overseas certificate to get a certificate of the same level through a simplified process. Under the current supervisor system of the Korean Counseling Association, each supervisor engages only in a specific chapter and is trained to supervise supervisees in the chapter, and this limits the supervisors’ training activities. As in the U.S. and Canada, it is necessary for the supervisors to be able to give training to any supervisees in different chapters. Fourth, the conditions for certificate maintenance and renewal need to be diversified flexibly. In the U.S. and Canada, CEU includes not only attendance at the certification education program of an institution but also participation in and holding of workshops, online seminars, hours to prepare dissertation writing, hours to prepare lectures in college, and hours to prepare publishing. Thus, the Korean Counseling Association may consider the conditions for certificate maintenance and renewal in more diverse aspects.