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실험계획법을 이용한 GDI연료펌프의 맥동저감을 위한 댐퍼 최적설계
김주영(Juyeong Kim),노진이(Jinyee Noh),이종욱(Jongwook Lee),김경남(Kyungnam Kim),박형종(Hyoungjong Park),황재근(Jaekeun Hwang),이연홍(Yeonhong Lee),윤길호(Gilho Yoon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study optimizes the profile of the diaphragm of a pressure pulsation damper structure in a high-pressure GDI engine system which is now under development by applying the design of experiment (DOE). As a high pressure pulsation ranging from 0 to 10 Bar deteriorates the performance of GDI engine, it is necessary to attenuate the large amplitude of fluid pulsation pressure of Gasoline fuel directly injected into GDI engine. In the development of this pressure damper, it becomes an issue to design optimal profiles of the enveloping diaphragms in terms of pulsation efficiency and mechanical stress for the sake of safety. Thus, this research develops a new finite element procedure considering the internal pressure variation by assuming the isoenthalpy state of the enveloped Helium gas inside the damper and integrates the iterative finite element procedure with the design of experiment (DOE).
김성신(Sungshin Kim),주광진(Gwangjin Joo),김주호(Jooho Kim),정연홍(Yeonhong Jung),박성욱(Sung-ook Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A new concept trailing arm bush in CTBA system consists of main rubber(X-leg) and muti-stoppers(2-rubbers/1-plastic). As the X-leg type is applied to main rubber, the longitudinal and vertical stffness can be minimized for comfort and road noise. And muti-stopper system used, the lateral stiffness can be maximized for handling and stability.
Assessing the toxic effects of accumulated arsenic on Arabidopsis thaliana
Jinwoo Jang,Yangwon Jeon,Yeonhong Kim,Geupil Jang,Youngdae Yoon 한국응용생명화학회 2024 Journal of Applied Biological Chemistry (J. Appl. Vol.67 No.-
Previous studies have reported that high pesticide and fertilizer use leads to a gradual accumulation of arsenic in soil environments. To understand the effects of arsenic on plant growth, we aimed to analyze the effect of As(III) on plant growth and development using Arabidopsis thaliana as a model plant. The results revealed that various aspects of plant growth, including seed germination and shoot development, were negatively impacted by As(III) treatment, but the effects were not significant. By contrast, root development was strongly suppressed by As(III) exposure, and the extent of suppression was dependent on the concentration of As(III) used. To gain a deeper understanding of adverse effects on root development, we examined the correlation between As(III) exposure and auxin, a key phytohormone responsible for root growth. Visualizing the auxin response in Arabidopsis roots using DR5::VEUNS and IAA2::GFP revealed that As(III) treatment suppressed auxin response in Arabidopsis roots, and this suppression was tightly correlated with the As(III) concentration. Furthermore, we used As(III)-specific bacterial cell-based biosensors to quantify the accumulation of arsenic in plants and establish a correlation with physiological changes. The inhibition of root growth was observed at 0.5 mg/g of As(III) treatment and it was correlated to 0.063 mg of As(III) per 1 g of dried plant. Although further investigations are required to fully assess the toxic effects of arsenic on the physiological properties of plants, the findings presented in this study provide valuable insights for evaluating the toxic effects of accumulated arsenic on plant growth and development.