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SE기반의 전순기 항공기 중량.평형관리 Program 개발
김정훈,박차환,정영화,김문규,강민성,Kim, Jeong Hun,Park, Cha Hwan,Jeong, Yeong Hwa,Kim, Mun Giu,Kang, Min Sung 한국시스템엔지니어링학회 2007 시스템엔지니어링학술지 Vol.3 No.2
There has been no systematic accumulation in the aircraft weight data even though those are crucial in the full life-cycle weight and balance program of aircraft. Companies, government agencies, and the Korea Air Force have been controling the data separately. The lack of communication between these institutes prevented the mutual use of the data. This study deals with a SE model-based weight and balance program development process for the full life-cycle weight and balance control of aircraft which enabled the efficient and mutual use of the weight data from the various institutes.
고성능 강재(HSB 800)를 적용한 플레이트 거더의 휨강도에 대한 플랜지 국부좌굴
김정훈,김경열,이정화,김경식,강영종,Kim, Jeong Hun,Kim, Kyoung Yul,Lee, Jeong Hwa,Kim, Kyung Sik,Kang, Young Jong 한국강구조학회 2014 韓國鋼構造學會 論文集 Vol.26 No.2
최근에 인장강도 800MPa급 고성능 강재가 개발되었지만 플랜지와 복부판의 상호작용을 고려한 플레이트 거더의 국부좌굴에 대한 연구는 아직까지 미흡한 실정이다. 본 연구는 HSB 800을 적용한 플레이트 거더의 플랜지 국부좌굴에 대한 강도를 비선형 유한요소해석으로 평가하였다. 비선형 해석 시 I-단면을 갖는 플레이트 거더의 플랜지와 복부판은 3차원 쉘요소로써 초기결함 및 잔류응력을 고려하였으며, 고성능 강재의 재료모델은 다중선형 재료로 모형화하였다. 이를 적용하여 복부판이 조밀, 비조밀 그리고 세장 단면을 갖는 압축 플랜지에 대해 매개변수 해석을 수행하였다. 플레이트 거더의 플랜지 국부좌굴에 대한 거동을 분석하였고, 본 연구의 비선형 해석 결과를 AASHTO LRFD(2012)와 도로교설계기준(한계상태설계법, 2012)의 압축플랜지 공칭휨강도와 비교하여 평가하였다. High performance steel for bridges(HSB 800) with a minimum tensile stress of 800MPa was recently developed. However, the study for local buckling behavior of plate girders considering interactive effects of flanges and webs is still insufficient. In this study, the flange local buckling(FLB) strength of plate girders with HSB 800 was evaluated by nonlinear finite element analysis. The flanges and webs of plate girders having I-section were modeled as 3D shell elements in the nonlinear analysis. Initial imperfection and residual stress were imposed on the plate girder. The high performance steel was modeled as a multi-linear material. Thus, parametric study of compression flanges with a compact, noncompact and slender web was performed. The flange local buckling behavior of plate girders was analyzed, and the nonlinear analysis results were compared with the nominal flexural strength of both AASHTO LRFD(2012) and KHBDC LSD(2012) codes.
김정훈,이준규,안영수,여정구,이진석,강기환,조철희,Kim, Jeong-Hun,Lee, Jun-Kyu,Ahn, Young-Soo,Yeo, Jeong-Gu,Lee, Jin-Seok,Kang, Gi-Hwan,Cho, Churl-Hee 한국재료학회 2019 한국재료학회지 Vol.29 No.11
In this study, we investigate the relationship between the peeling behavior of the backsheet of a photovoltaic(PV) module and its surface temperature in order facilitate removal of the backsheet from the PV module. At low temperatures, the backsheet does not peel off whereas, at high temperatures, part of the backsheet remains on the surface of the PV module after the peeling process. The backsheet material remaining on the surface of the PV module is confirmed by X-ray diffraction(XRD) analysis to be poly-ethylene(PE). Differential scanning calorimetry(DSC) is also performed to investigate the interfacial characteristics of the layers of the PV module. In particular, DSC provides the melting temperature($T_m$) of laminated ethylene vinyl acetate(EVA) and of the backsheet on the PV module. It is found that the backsheet does not peel off below the $T_m$ of ethylene of EVA, while the PE layer of the backsheet remains on the surface of the PV module above the $T_m$ of the PE. Thus, the backsheet is best removed at a temperature between the $T_m$ of ethylene and that of PE layer.
지적재산권의 증권화(證券化)-최근 미국에서의 경향을 중심으로..
김정훈,Kim, Jeong-Hun 한국특허정보원 2004 Patent 21 Vol.58 No.-
본 글은 Washington CORE LLC의 John S. Hillery 2004년 3월 자 Securitization of Intellectual Property: Recent Trends from the United States"를 번역한 것입니다. 한국어로의 번역 및 번역된 글의 "Patent21(한국특허정보원 발행)"에의 게재에 대한 저자의 허락을 받았으며, 저자가 요청한 고지사항을 아래와 같이 고지합니다. This report came from the Japanese IIP and you can download the original report in English from Japanese website. It was written by John Hillary of Washington CORE. 영어 원본은 모두 9장으로 구성되어 있으나, 번역에서는 산업재산권에 속하지 아니하는 저작권의 증권화부분(7장)을 생략했습니다.
지역적이고 비정규분포를 갖는 데이터의 공정관리를 위한 지역기반 T<sup>2</sup>관리도
김정훈,김성범,Kim, Jeong-Hun,Kim, Seoung-Bum 한국품질경영학회 2012 품질경영학회지 Vol.40 No.3
Purpose: A Control chart is one of the important statistical process control tools that can improve processes by reducing variability and defects. Methods: In the present study, we propose the local $T^2$ multivariate control chart that can efficiently detect abnormal observations by considering the local pattern of the in-control observations. Results: A simulation study has been conducted to examine the property of the proposed control chart and compare it with existing multivariate control charts. Conclusion: The results demonstrate the usefulness and effectiveness of the proposed control chart.