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윤준형,김종우,이선영,김규남,조인영,조영민 대한비만학회 2012 The Korean journal of obesity Vol.21 No.3
연구배경: 비만은 심혈관계 질환의 주요 위험인자이며, 당뇨병, 고혈압, 이상지혈증의 위험을 높인다. 하지만 아직까지노인에서 특화된 비만지표가 알려져 있지 않아, 성인에서 흔히사용되는 비만지표를 사용하고 있는 실정이다. 따라서 저자들은 임상에서 흔히 사용되고 있는 여러 비만지표 중에서 노인인구의 대사지표를 가장 잘 반영하는 것을 찾아보고자 연구를시행하였다. 방법: 국민건강영양조사 제4기 2차년도(2008년)와 3차년도(2009년)의 자료를 이용하여, 건강 설문, 검진, 체지방검사 결과가 존재하는 60세 이상의 노인 1193명을 대상으로 연구하였다. 노인에서 비만지표로 흔히 사용되는 허리둘레, 체질량지수, 총체지방률뿐만 아니라 사지근육량, 몸통지방량, 총근육량도 비만지표로 추가하여 이들 간의 상관관계를 알아보았고, 각 비만지표와 공복혈당, 총콜레스테롤, HDL-C, 중성지방, LDL-C, HOMA-IR 등의 대사지표간의 상관관계를 알아보았다. 결과: 노인의 비만지표 중 체질량지수와 총체지방률은 상관관계를 보이지 않았다. 체질량지수는 허리둘레와 유의한 상관관계를 보였으며, 총체지방률은 사지근육량, 몸통지방량, 총근육량과 유의한 상관관계를 보였다. 노인에서 허리둘레는 공복혈당, HDL-C, 중성지방, HOMA-IR과, 체질량지수는 HDL-C,중성지방, HOMA-IR과 유의한 관련성을 보였다. 여성 노인에서 체질량지수는 공복혈당, 총콜레스테롤과도 유의한 관련성을 보였다. 총체지방률, 사지근육량, 몸통지방량, 총근육량 등은 여러 대사지표와 상관관계를 보이지 않았다. 결론: 한국 노인의 대사지표와의 관련성을 고려해 볼 때 가장 적절한 비만지표는 허리둘레와 체질량지수이다
지면효과에 의한 2차원 Cylinder의 양력변화에 대한 수치적 해석
윤준형,김형민 경기대학교 부설 산업기술종합연구소 2003 산업기술종합연구소 논문집 Vol.25 No.-
In this study, the Non-dimensional Navier-Stokes equations for two-dimensional time-dependent viscous flow are solved with a finite volume method. With this numerical procedure, the ground effect and the vortex shedding flow past a circular cylinder near a wall is investigated. The flow is calculated for a broad range of height ratios for different Reynolds numbers ranging from 250 to 1000. Based on the numerical solutions, the vortex shedding and the ground effect is observed using various methods.
전력케이블용 친환경 반도전 컴파운드의 결정화도와 분산 특성의 상관관계에 대한 연구
한재규,윤준형,성수연,전근배,박동하,Han, Jae Gyu,Yun, Jun Hyeong,Seong, Soo Yeon,Jeon, Geun Bae,Park, Dong Ha 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.5
In this paper, we study the correlation between the crystallinity of semiconductive compounds for eco-friendly power cables and the dispersive properties of carbon black. The crystal structure of the polymer material is advantageous for mechanical properties and heat-resistance. However, the polymer acts as an inhibitor to the dispersibility of carbon black. The purpose of this study is to develop a TPE semiconductive compound technology. The high heat resistance and ultra-smoothness characteristics which are required for high voltage and ultra-high voltage cables should be satisfied by designing and optimizing the structure of a non-crosslinking-type eco-friendly TPE semiconductive compound. The application of excess TPE resin was found to not only inhibit the processability in the compounding process, but also reduced the dispersion properties of carbon black due to higher crystallinity. After the crystallinity of the compound was identified through DSC analysis, it was compared with the related dispersion characteristics. Through this analysis and comparison, we designed the optimal structure of the eco-friendly TPE semiconductive compound.
강미정,김종우,이선영,김규남,윤준형,기홍석 대한가정의학회 2017 Korean Journal of Family Medicine Vol.38 No.5
Background: Friedewald equation is the most widely used method for estimating low-density lipoprotein choles-terol (LDL-C) level. However, due to potential over- or underestimation, many studies have used a modified equa-tion. This study aimed to compare estimates by 4 different equations to directly measured LDL-C concentrations in order to propose the most appropriate method for LDL-C estimation in the Korean population.Methods: We studied data of 4,350 subjects that included total cholesterol, high-density lipoprotein cholesterol (HDL-C), triglyceride (TG), and LDL-C concentrations that had been measured at one university hospital in Seoul. We investigated 4 equations: LDL-C by Friedewald’s original equation (LDL-CF) and its 3 modifications. Pearson correlation analysis was performed to compare these estimates to the direct measurement.Results: Pearson correlation analysis revealed a good correlation among all 4 estimated LDL-C values and the di-rectly measured LDL-C value. The Pearson coefficients were 0.951 for LDL-CF, 0.917 for LDL-C by Hatta equation (LDL-CH), 0.968 for LDL-C by Puavilai equation (LDL-CP), and 0.983 for LDL-C by Martin equation (LDL-CM). Mar-tin equation (LDL-CM) resulted in the best approximation (mean difference from the direct measurement, 5.5 mg/dL; mean percentage difference from the direct measurement, 5.1%) and the best agreement with the direct mea-surement (86.1%). LDL-CP resulted in the second-best approximation (mean difference, 7.0 mg/dL; mean percent-age difference, 6.2%; concordance, 82.5%). LDL-CM was found to be less influenced by TG and HDL-C levels than by LDL-CF.Conclusion: Estimates by Martin equation had the best agreement with direct LDL-C concentrations and both Martin and Puavilai equations were superior to Friedewald equation for estimating LDL-C concentrations in Kore-an adults.