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Duhee Kim(김두희),Murali Bissannagari(무라리 비산나가리),Hongki Kang(강홍기) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
The transparent electro-optical neural electrode has the advantages of simultaneous high spatial resolution calcium recordings or microscopic imaging along with electrical recording and stimulation. During light-induced optogenetic modulation, the transparent neural electrode has excellent light transmission efficiency and can prevent distortion of signal caused by photoelectric artifacts. In this work, we fabricated an 8 nm-thick ultrathin Au metal electrode based on a polymer seed layer, which is beneficial to form a continuous metal film. Our electrode shows excellent optical transparency and mechanical flexibility owing to the lowered thickness. With the inkjet printing of PEDOT:PSS on neural recording sites, our electrode shows excellent electrochemical performance, maintaining transparency. We recorded brain surface signals in vivo while maintaining low RMS noise and high SNR. Also, our electrode shows lower light-induced artifacts thanthe conventional opaque electrode, within reasonable laser power density ranges for optogenetics modulation. This new fabrication concept of the transparent electrode has the high scalability to include electrodes for rollable displays, flexible solar cells, and ion sensing platforms that require long-term stability in aqueous solutions.
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),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.
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℃).
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.