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무게측정방식에 따른 Lever-linked Roberval Mechanism의 설계특성
안지윤 ( Ji Yun An ),안중환 ( Jung Hwan Ahn ),이길승 ( Gil Seung Lee ),김화영 ( Hwa Young Kim ) 한국센서학회 2020 센서학회지 Vol.29 No.5
The deflection and null balance methods are used for precision force measurement in the precision industry. Since both methods are based on deformation, the performance of the load cell mechanism is important. In this study, the design variables were obtained via the free body diagram of a lever-linked Roberval mechanism (combined with a flexible hinge link and a Roberval mechanism), and the design characteristics were analyzed according to the weight method. Based on the design characteristics, the optimal design was conducted according to the weight method and FEM was used to verify its reliability.
안지윤(Ji Yun An),안중환(Jung Hwan Ahn),김화영(Hwa Young Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.5
As the modern hydrogen industry develops, storage vessels require high capacity and stability. In general, high-pressure hydrogen gas is used to increase storage properties. However, in the case of this high-pressure hydrogen, it is necessary to reduce the pressure to match the pressure used in the product. Therefore, a pressure reduction process using a regulator is required, and the regulator must always maintain a constant flow rate and pressure even if a change in inlet pressure changes. Therefore, due to the characteristics of the regulator in which the outlet flow rate and pressure must be constant, a robust design must be made. In this study, the design variables of the regulator were defined, the control volume and the piston behavior were obtained, and the outlet pressure and flow rate were simulated through system modeling and compared through experiments.
간세포(肝細胞)의 산화적 손상에 대한 백화사설초(白花蛇舌草)의 항산화효과
김형환,이채중,박철수,김미랑,김종대,문진영,안중환,Kim, Hyeong-Hwan,Lee, Chae-Jung,Park, Chul-Soo,Kim, Mi-Rang,Kim, Jong-Dae,Mun, Jin-Young,An, Jung-Hwan 대한한방내과학회 2002 大韓韓方內科學會誌 Vol.23 No.1
Objective : This study was designed to investigate the anti-oxidative effects of Oldenlandiae Diffusae Herba Water extract (ODHW) on lipid peroxidation by free radicals oxidative hepatic injury. Methods : In order to evaluate anti-oxidative activities of ODHW in the liver cell, cultured normal rat liver cells(Ac2F) were incubated with or without ODHW. After 16 hours to 18 hours of experiment, cells were placed in DMEM medium without serum, and then incubated with 1mM tert-butyl hydro-peroxide(t-BHP) for two hours. Viable cells were detected by MTT assay. The levels of LPO induced by hydroxyl radical derived from H2O2-Fe2+ system in rat liver homogenate were determined by means of TBA. Inhibitory effect of ODHW on superoxide generation was measured by xanthine-xanthine oxidase system. Results : In the linoleic acid autoxidation system, ODHW exhibited antioxidant activity, which inhibited 85% of linoleic acid peroxidation. These effects were similar to those of dl-a-tocopherol. ODHW showed scavenging effects on DPPH radical, inhibited superoxide generation in xanthine-xanthine oxidase system, and also inhibited lipid peroxidation of rat liver tissue with hydroxyl radical derived from $H_2O_2-Fe^{2+}$ system. In addition, ODHW protected the cell death induced by t-BHP and it significantly increased cell viability in a normal rat liver cell(Ac2F)