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레이저 유도 전사를 이용한 유연기판의 액체금속 미세 패터닝
조민제,지석영,조정호,장원석 한국정밀공학회 2023 한국정밀공학회지 Vol.40 No.2
We have developed a direct conductive patterning method with micro-scale line widths using the laser-induced-forward transfer (LIFT) and liquid metal. As this method does not need post-thermal processing, there is no thermal damage even on heat-sensitive polymer substrates by low-power laser irradiation on the dynamic release layer (DRL). Unlike other liquid metal patterning processes, this procedure can easily achieve fine line widths of a few tens of micrometers corresponding to laser spot size. The solid-state UV pulse laser with 266 nm wavelength and 20 ns pulse duration was used to transfer Eutectic Gallium Indium (EGaIn) liquid metal and the results for the single and multi-pulse laser irradiation were investigated to determine the effective process conditions. The applicability of flexible circuit fabrication and selective circuit repair was successfully tested on Polyimide (PI) substrate. After the LIFT process, the electrical properties of liquid metal on the pattern were measured to be approximately 5~8 x 10-3 Ω/m of resistance.
『甕算綱目』 연구 ― 19세기 무인의 현실 인식과 개혁 방안 ―
조민제 동양고전학회 2024 東洋古典硏究 Vol.- No.94
"Ongsan Gangmok" is a book which reforms the way of administration of countries. The previous researches are two reference manual of this book, written by Bae Hyun-sook, the researcher of the National Library of Korea and Baek Jin-woo, Department of Overseas Korean Studies Data Center. Those only introduced the overall content and format of the book, but did not provide any information of author and the time book written. But there were some clues to estimate about the author and the period of writing. The basis for estimating the author and the book written are the contents of the chapter four and five, through this contents I could find out following results. First, the author of this book is the man in the late 19th century. the author mentioned about patrol and signal fire in chapter five, and those should be organized well before the war outbreak. And he also asserted that importance of telegram, this means the author lives when the signal and telegram coexist. As the time the equipment appears were 1885 and the signal was abolished was 1895, I could figure out this book must be written between 1885 and 1895. Second, the author was a warrior studied traditional knowledge of Confucianism and historical knowledge. He introduced himself as a humble rank man in preface of the book. He cited not only many books about Confucianism, and also about military strategy and tactics belongs to book name “Mugyung Chil seo”. He firstly quoted the text of those books and insisted his thinking at the after it. He also emphasized that a warrior should be a higher rank than an ordinary people because they are in charge of protecting the country. and he also mentioned that regardless what he rank, if he or she have brave and outstanding martial ability, they should be highly awarded. Third, the author is a Korean. He mentioned the great scholar of Joseon Dynasty “Mr. Yulgok” and the martial book named “Muyedobotongji”, “Byeonghakjinam” published in Joseon Dynasty. At the end of the book, he cited two examples the record of the king of Sui and Tang Dynasty, which is about the defeated by Goguryeo, one of the country in Three Kingdom Period. In this book, the author presented ways to overcome crisis on 19th century, such as the increase of the national army. It is worth that he shared the similar ideological line with 19th East Asian intellectuals, and he accepted Western scientific technique rather than rejecting there culture and technology. It is also meaningful that he showed a message to Western forces by mentioning the result of war due to individual greed, and also reminded past record of overcoming the crisis to the public. However, he still presents an abstract solution that does not fit reality, it reveals the limitation that he was an intellectual who could not escape from Neo-Confucianism.