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탄탈륨 함유 9%Cr 페라이트/마르텐사이트 강의 미세조직 및 기계적 특성
백종혁 ( Jong Hyuk Baek ),한창희 ( Chang Hee Han ),김성호 ( Sung Ho Kim ),이찬복 ( Chan Bock Lee ),한도희 ( Do Hee Hahn ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.4
It was evaluated that the microstructural and mechanical properties of Ta-bearing 9Cr-0.5Mo-2W ferritic/martensitic experimental steels. All the experimental steels showed the tempered martensitic microstructures, and M23C6 carbides, whose sizes were ranged from 200 to 300 nm, were easily observed at both boundaries of the prior austenite grain and the martensite lath. In addition, a relatively large Nb-rich MX carbonitrides were intermittently detected at the prior austenite grain boundaries, whereas a lot of V-rich MX carbonitrides, whose mean diameter was less than 50 nm, were observed randomly at both boundaries. Ta was mainly incorporated into the V-rich MX carbonitrides rather than the Nb-rich ones and their content was spanned from 5 to 20 at.%. Ta contents within the MX precipitates also increased as the content of Ta increased. Because the Ta addition into the steels would be attributed to the precipitation strengthening, solid solution strengthening and lath width reduction, it was shown that the mechanical properties, including hardness, tensile strength and creep rate of the 9%Cr-0.5Mo-2W steels were improved by the increase of Ta content. Especially, 9Cr-0.5Mo-2W-0.3V-0.05Nb-0.14Ta steel was revealed to be relatively excellent in the application for the SFR fuel cladding.
클러스터링 기법을 활용한 중소기업 지원 지식서비스의 성과유형 분류
이정우(Jungwoo Lee),김성진(Sung Jin Kim),김민관(Min Kwan Kim),유재영(Jae Young Yoo),한혁(Hyuk Hahn),박훈(Hun Park),한창희(Chang-Hee Han) 한국전자거래학회 2017 한국전자거래학회지 Vol.22 No.3
많은 제조기반의 중소기업들은 프로세스나 제품을 혁신하기 위해 공공 및 사기업의 지식서비스를 아웃소싱하고 있다. 본 연구의 사례인 K 연구원은 여러 지식서비스를 다양한 조합형태로 제공하는데, 이러한 제공형태의 복잡성으로 인해 지식서비스 사업성과를 정확히 분석 한다는 것이 어려운 상황이다. 본 연구는 기존에 성과평가 항목을 상향식으로 선정하는 방식이 아닌 하향식 관점에서 성과항목을 도출하였다. K 연구원 지식서비스 수혜기업인 82개 기업사례에서 74개의 성과항목이 도출되었고, 최종적으로 17개 항목으로 정제하였다. 이후 사례-성과 행렬을 구조화하여 기업별 성과의 유무를 조사하여 이진 데이터로 입력하였다. K-means 클러스터링 분석을 통해 3개의 군집을 각각 ‘핵심 경쟁력 강화(제품 및 특허)’, ‘국내 및 해외시장 확대’, ‘운영 효율성 제고’로 식별할 수 있었다. In recent years, many small and medium-sized manufacturing companies are making process innovation and product innovation through the public knowledge services. K Research institute provides different types of knowledge services in combination and due to this complexity, it is difficult to analyze the performance of knowledge service programs precisely. In this study, we derived performance items from bottom-up viewpoints, rather than top-down approaches selecting those items as in previous performance analysis. As a result, 74 items were finded from 82 companies in the K Research Institute case book, and the final result was refined to 17 items. After that a case-performance matrix was constructed, and binary data was entered to analyze. As a result, three clusters were identified through K-means clustering as ‘enhancement of core competitiveness (product and patent),’ ‘expansion of domestic and overseas market,’ and ‘improvement of operational efficiency.’
원자핵건판 내의 (K, K)반응점에서 Λ하이퍼핵의 탐색
김희창,윤천실,한창희 昌原大學校 基礎科學硏究所 1995 基礎科學硏究所論文集 Vol.7 No.-
At KEK PS K2 beam line, the 1.66 GeV/c ?? beam was exposed to the emulsion(Fuji ET 7-B) which has resolution(~1μm) of recording a charged particle track, K?? and Λ-hypernucleus immediately came out after the reaction ??p→??, p→ΛΛ+28 MeV. We have searched the single Λ-hypermucleus at (K??, K??) reaction vertex in the emulsion(mod #3 ~ #15) by the emulsion-counter hybrid method. Hyperfragment track(1 ~ 10μm) is observed at (K??, K??) point with 78 events for single Λ-hypernucleus and 3 events of double Λ-hypernucleus, which can be classified by HF's emission angle(B/F=1/3), azimuthal angle(isotropic) and range(1~10μm). The single Λ-hypernucleus can easily escape the nucleus in the region ?? < 1.0GeV/c. The ?? emission angle, kinetic energy, total energy and mass are obtained by supposing the two body reaction p(??,??)?? in the kinematics. Three (??, ??) data are analyzed with high mass #15-10-40 ??(2033±45 MeV/c²), #11-11-11??(1849±43 MeV/c²), #13-2-49 ??(1745±45 meV/c²).