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이승표,김형관,김용진,오세일,손대원 한국심초음파학회 2014 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.22 No.2
Background: Although rarefaction of myocardial angiogenesis has been shown to be associated with left ventricular (LV)systolic dysfunction in animal models of ventricular hypertrophy, this relationship has not been investigated in depth norvalidated in humans. We aimed to analyze the relationship of myocardial angiogenesis with various functional and structuralventricular remodeling parameters in moderate to severe aortic stenosis (AS) patients with normal LV ejection fraction (LVEF). Methods: A total of 38 moderate or severe AS patients with LVEF > 50% were enrolled for the current study and all patientsunderwent LV endomyocardial biopsy at the septum during aortic valve replacement. The biopsy specimens were stained forplatelet endothelial cell adhesion molecule-1 (CD31) to analyze the density of blood vessels in the myocardium. Results: The degree of myocardial angiogenesis tended to increase with worse myocardial systolic function, LV filling pressure andprogressed ventricular hypertrophy (Spearman’s ρ = -0.388, p = 0.016 for LVEF; Spearman’s ρ = 0.442, p = 0.007 for E/e’; Spearman’sρ = 0.424, p = 0.008 for LV mass index). The degree of myocardial angiogenesis was also significantly associated with the degree ofaortic valve stenosis (Spearman’s ρ = -0.368, p = 0.023). There was significant difference in the degree of myocardial angiogenesisaccording to the LV geometry (p = 0.016 for mean difference between different LV geometry groups by analysis of variance). Significant predictors of myocardial blood vessel density were LV mass index (β = 0.398, p = 0.010) and LVEF (β = -0.313, p = 0.028). Conclusion: There is a close relationship between myocardial angiogenesis and LV remodeling in moderate to severe ASpatients with normal LVEF, with angiogenesis increasing with LV hypertrophy. Further studies to demonstrate the mechanismunderlying this phenomenon is warranted.
편리한 입력방식의 단조공정해석을 위한 CAMPform3D의 전처리기 개발
이승표,이강수,박성균,이상헌 한밭대학교 생산융합기술연구소 2004 생산기반기술연구소 논문집 Vol.4 No.1
CAMPform3D is a Finite Element Method (FEM) based process simulation system designed to analyze three dimensional (3D) flow of various metal forming processes. It enables designers to analyze metal forming processes on the computer rather than the shop floor using trial and error and provides vital information about material and thermal flow during the forming process to facilitate the design of products. CAMform3D can be used by companies, research institutes and industrial applications to analyze forging, extrusion, drawing, heading, upsetting and many other metal forming processes. Also, process simulation using CAMPform3D can be instrumental in cost, quality and delivery improvements at leading companies. Today's competitive pressures required companies to take advantage of every tool for rapid manufacturing of well-designed product. So, the preprocessor of simulation program must be easy to use to speed-up design. In this paper, we introduce new version of CAMPform3D (ver 1.0) and show how easy to use it. And, CAMPform3D will prove itself to be easy and extremely effective.
불규칙 표면 시편을 이용한 Flexible 위상배열초음파기술 적용 연구
이승표,문용식,정남두,Lee, Seung-Pyo,Moon, Yong-Sig,Jung, Nam-Du 한국비파괴검사학회 2015 한국비파괴검사학회지 Vol.15 No.1
원자력발전소에는 탄소강과 스테인리스강 용접을 위해 alloy600 용접재를 적용한 이종금속용접부가 다수 존재하며, 전 세계적으로 이종금속용접부에서 결함 발생 보고가 지속되고 있다. 주기적인 건전성 평가를 위해 이종금속용접부 초음파검사 일반절차서 (KPD-UT-10)를 적용하여 검사를 수행하고 있으며, 검사절차서에서는 탐촉자와 검사체 표면 사이의 간격을 최대 1/32"(0.8mm) 이내로 제한하고 있다. 국내의 일부 이종금속용접부는 테이퍼진 형상과 불규칙한 표면 형상을 가지고 있어, 가변형 위상배열초음파기술을 적용하여 검사 신뢰성을 높이고자 본 연구를 수행하였다. 연구 결과, 검사체 표면이 불규칙한 시편 내부의 인공결함에 대한 검출이 양호하였고, 이를 통해, 가변형 위상배열초음파기술의 현장 적용 가능성을 확인하였다. Nuclear power plant contain many dissimilar metal welds that connect carbon steel components with stainless steel pipes using alloy600 welding materials. Primary water stress corrosion cracks at dissimilar metal welds have been continuously reported around the world. In periodic integrity evaluations, dissimilar metal welds are examined using a generic ultrasonic testing procedure, KPD-UT-10. In this procedure, the gap between the probe and examination surface is limited to 1/32 inch (0.8mm). It is not easy to test some dissimilar metal welds in Korean plants applying ordinary technology because of their tapered shapes and irregular surface conditions. This paper introduces a method for applying a flexible phased array technology to improve the reliability of ultrasonic testing results for various shapes and surface conditions. The artificial flaws in specimens with irregular surfaces were completely detected using the flexible phased array ultrasonic technology. Therefore, it can be said that the technology is applicable to field examination.
이승표,강기원,장세명,이장호,Lee, Seung-Pyo,Kang, Ki-Weon,Chang, Se-Myong,Lee, Jang-Ho 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
In recent years, wind energy has been the world's fastest growing source of energy. This paper describes the structural design and analysis of composite blade for 2 kW-level HAWT (horizontal axis wind turbine). The aerodynamic design and force, which are required to design and analyze a composite blade structurally, are calculated through BEMT(blade element momentum theory) implemented in public code PROPID. To obtain the equivalent material properties of filament wound composite blades, the rule-of-mixture is applied using the basic material properties of fiber and matrix, respectively. Lay-up sequence, ply thickness and ply angle are designed to satisfy the loading conditions. Structural analysis by using commercial software ABAQUS is performed to compute the displacement and strength ratio of filament wound composite blades.