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정영관(Youngguan Jung),김세웅(Sewoong Kim),서명수(Myungsu Seo),정연구(Yeongu Jung),김두희(Duhee Kim),김병수(Byungsoo Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently interest of hybrid and electric vehicles is rising rapidly due to exhaust control. The lithium ion rechargeable battery has several advantages such as high energy density, no memory effect and light weight therefore the lithium ion rechargeable battery is used at hybrid and electric vehicles. In this study the electrolyte for the lithium ion rechargeable battery used in low temperature was developed and tested. EC, DMC, EMC were chosen as a solvent for the electrolyte and mix proportion was 1:1:1. LiPF? (1.1 mole with 1.0~1.5wt% PC) was chosen as a lithium salt. Experiments showed that the lithium ion rechargeable battery using the developed electrolyte kept 99% capacity of battery in low temperature(-35℃).
Kim Byungsoo,Seo Jung Wook 대한영상의학회 2021 대한영상의학회지 Vol.82 No.5
Renal epithelioid angiomyolipoma (EAML) is a rare variant of angiomyolipoma (AML), with a prominent epithelioid component. EAML usually presents as a large heterogeneous soft tissue lesion with intratumoral hemorrhage and variable necrosis or cystic changes. We present a case of multiloculated cystic renal EAML mimicking renal cell carcinoma in a 64-year-old female. Intracystic massive hemorrhage, hyperattenuating wall and septa on an unenhanced study, and enlarged intratumoral vessels can be helpful imaging features for distinguishing renal EAML from renal cell carcinoma.
정영관(Youngguan Jung),김경훈(Kyunghoon Kim),김세웅(Sewoong Kim),이현진(Hyunjin Lee),김두희(DuHee Kim),김병수(Byungsoo Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The performance of PEMFC is known to be influenced by different operating conditions such as temperature, pressure, and humidification of the reactant gases. Especially, the humidification is essential for performance enhancement of the PEMFC because proton conductivity depends on hydration of the membrane. In this study, the visualization experiment is in order to verify dew condensation in channel of PEMFC. As the results, the dew condensation was verified through visualization experiment on the temperature variation. These problems, such as precise control of the dew condensation were resolved by supplying low humidity reactant gas.
정창훈(Changhoon Jung),이원희(Wonhee Lee),구병수(Byungsoo Koo),김기완(Kiwan Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Various types of heat exchangers are used to exchange heat between two fluids with different temperatures in many engineering applications including space heating, air-conditioning, power production, waste recovery, chemical processing and such. Compact and highly efficient heat exchangers are needed especially for aircraft applications due to many restrictions. Heat exchangers working in aircraft should have higher performance than those working in other applications. Two types of heat exchangers having same size were analyzed and compared through experiment. One is plate fin type heat exchanger and the other is fin tube heat exchanger. Plate fin type exchanger has higher performance than fin tube type one and it is concluded that plate fin type heat exchanger is suitable for aircraft application.
정영관(Youngguan Jung),김두희(DuHee Kim),김병수(Byungsoo Kim),김경훈(Kyunghoon Kim),김세웅(Sewoong Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The performance of PEMFC is known to be influenced by different operating conditions such as temperature, pressure, and humidification of the reactant gases. Especially, the humidification is essential for performance enhancement of the PEMFC because proton conductivity depends on hydration of the membrane. In this study, the experiment was conducted about the influence of humidification factors, such as water level, channel length and water temperature by using of the bubble and the membrane humidifier. As the results, it was difficult to control the exact humidity by adjusting humidification factors. But, it was resolved by exact humidity control through humidifier valve on/off control.
정영관(Youngguan Jung),이현진(Hyunjin Lee),김병수(Byungsoo Kim),김경훈(Kyunghoon Kim),김세웅(Sewoong Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this study, two types of the PEMFC stacks were chosen. Those are laminated stack and non-laminated series stack. Not only the performance of the two types of the combinations of the PEMFC stack but also the performance of component unit cells was measured on different flow rate of reaction gases each other. As the result, the performance of a laminated stack was higher than the performance of non-laminated stacks because of difference of electric resistance caused connecting cells.
정영관(Youngguan Jung),김세웅(Sewoong Kim),황철민(Chulmin Hwang),김두희(Duhee Kim),김병수(Byungsoo Kim) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Visualization experiments were carried out on a artificial defect in order to investigate the painting exfoliation mechanism on defects. The behavior of bubbles on the temperature at defects were observed through a microscope and the range of temperature was from 30 to 70degrees. As the results, bubbles made by thermal expansion of the air in defects are a cause of the painting exfoliation. Also, the thin and large expansion of bubbles in liquid paint to be under the hardening paint layer growing from the painting surface form into shape of the painting exfoliation.
정영관(Youngguan Jung),이현진(Hyunjin Lee),김병수(Byungsoo Kim),김세웅(Sewoong Kim),김종수(Jongsoo Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
As the output voltage from unit cell of PEMFC is very too low voltage to use in real life, so the fuel cell is used through connecting the multiple cells. But there is a shortage of various studies about combination of PEMFC stacks. In this study, two types of the PEMFC stacks were chosen. Those are laminated stack and non-laminated parallel stack. The performance of the two types of the combinations of the PEMFC stack was measured on different flow rate of reaction gases each other. As the result, the performance of a laminated stack was higher than the performance of non-laminated parallel stacks because of difference of electric resistance caused connecting cells.