• Title/Summary/Keyword: Doo-Jong Kim

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Patterning of Super-hydrophobic Surface Treated Polyimide Film (초발수 기판의 친수 패터닝을 이용한 금속배선화)

  • Rha, Jong-Joo;Um, Dae-Yong;Lee, Gun-Hwan;Choi, Doo-Sun;Kim, Wan-Doo
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1553-1555
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    • 2008

  • Super-hydrophobic treated Polyimide film was used as a flexible substrate for developing a new method of metallization. Hydrophilic patterns were fabricated by IN irradiation through shadow mask. Patterned super-hydrophobic substrate was dipped into a bath containing silver nano ink Silver ink was only coated on hydrophilic patterned area. Metal lines of $600{\mu}m$ pitch were fabricated successfully. However, their thickness was too thin to serve as interconnection. To overcome this problem, iterative dipping was conducted. After repeating five times, the thickness of silver metal lines were increased to over than $2{\mu}$. After heat treatment of silver lines, their resistivities were reduced to order of $30{\mu}{\Omega}$-cm the similar level of values reported in other literatures. So, a new method of metallization has high potential for application of RFID antenna and flexible electronics substrates.

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A Energy Saving and Illuminance of a Classroom due to the arrangement of luminaires (조명기구의 배치에 따른 교실의 조도와 에너지 절약)

  • Kim, Lee-Doo;Oh, Se-Young;Park, Hee-Doo;Shin, Jong-Yeol;Lee, Soo-Won;Hong, Jin-Woong
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2417-2419
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    • 1999

  • Among educational environment, lighting's role is getting more important since it improves the visual tasks, capability of work, and it help to build both balanced mind and body. Also, since students spend most of their time inside rather than outside, students need appropriate illuminance everyday. If optimum illuminance, the color rendering properties and controlled distribution of lighting is given, people can decrease the fatigue of eyes, recover their health, and also, people can maximize their efficiency of work. In this paper, their is a comparison between the real illuminance and illuminance distribution due to the uniformity ratio of 2 or 3 dimensions by simulation.

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