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공정 모니터링 광학모듈이 장착된 UV 레이저 미세가공 플랫폼 제작
손현기,이제훈,정용운,김상인,한재원 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.2
Laser micromachining has increasingly been adopted in various advanced industries where the high-precision machining of large-area, high-density and multi-layered components is in a strong demand. To effectively meet the requirements, the laser micromachining process must be carefully monitored. In order to facilitate the development of a new laser micromachining process and/or a new system, we have fabricated a UV laser micromachining platform that is equipped with optical modules for monitoring the process online. They include a laser power stabilizing module, a module for laser-induced breakdown spectroscopy, and an auto-focusing module.
이종 금속이 코팅된 금속소재를 이용한 인쇄전자소자용 선폭 10㎛급 패턴 가공
손현기,카오 후안 빈,조용권,신동식,최지연,Sohn, Hyonkee,Cao, Binh Xuan,Cho, Yong-Kwon,Shin, Dong-Sig,Choi, Jiyeon 한국레이저가공학회 2014 한국레이저가공학회지 Vol.17 No.4
In printed electronics, printing rolls are used to transfer electronic ink onto a flexible substrate. Generally printing rolls are patterned in microscale by the indirect laser method. Since based on the wet etch process, the indirect method is neither environment-friendly nor suitable for making a printing roll with patterns narrower than $20{\mu}m$. In this paper, we have directly engraved micro-patterns into a Zn-coated metal specimens using a picosecond laser in order both to engrave $10{\mu}m$-wide patterns and to improve the pattern profile. Experiments showed that it is possible to engrave $10{\mu}m$-wide patterns with an a rectangular-shaped profile which is necessary for the dimensionally accurate printing.
손현기,윤민호,김태은,여남경 대한이비인후과학회 2018 대한이비인후과학회지 두경부외과학 Vol.61 No.10
Nasal septal infection can result from progression of a fungal infection from the adjacent sinuses. Nasal septal fungal abscesses complicating nasal trauma, surgical procedures, sinus, anddental infections have previously been reported in a small number of cases. Adequate managementinvolves early diagnosis, prompt empiric antifungal therapy, and surgical debridement inorder to prevent the development of life-threatening complications. We report a rare case of nasalseptum necrosis from Aspergillus infection in a 79-year-old man with diabetes mellitus andchronic renal failure following endoscopic sphenoid sinus surgery due to an isolated sphenoidfungal ball.
Dielectric 마스크 적용 UV 레이저 프로젝션 가공을 이용한 빌드업 필름 내 선폭 10μm급 패턴 가공 연구
손현기,박종식,정수정,신동식,최지연,Sohn, Hyonkee,Park, Jong-Sig,Jeong, Su-Jeong,Shin, Dong-Sig,Choi, Jiyeon 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.3
To engrave high-density circuit-line patterns in IC substrates, we applied a projection ablation technique in which a dielectric ($ZrO_2/SiO_2$) mask, a DPSS UV laser instead of an excimer laser, a refractive beam shaping optics and a galvo scanner are used. The line/space dimension of line patterns of the dielectric mask is $10{\mu}m/10{\mu}m$. Using a ${\pi}$ -shaper and a square aperture, the Gaussian beam from the laser is shaped into a square flap-top beam; and a telecentric f-${\theta}$ lens focuses it to a $115{\mu}m{\times}105{\mu}m$ flat-top beam on the mask. The galvo scanner before the f-${\theta}$ lens moves the beam across the scan area of $40mm{\times}40mm$. An 1:1 projection lens was used. Experiments showed that the widths of the engraved patterns in a buildup film ranges from $8.1{\mu}m$ to $10.2{\mu}m$ and the depths from $8.8{\mu}m$ to $11.7{\mu}m$. Results indicates that it is required to increase the projection ratio to enhance profiles of the engraved patterns.
손현기 한국박물관학회 2014 博物館學報 Vol.- No.27
This study explores implications of the oral recordings from intangible cultural heritage and intellectual property relevance to the works with a case from ‘Research of Inheritors of Important Intangible Cultural Heritage Via Their Oral Recordings’ at the National Research Institute of Cultural Heritage in the South Korea. Today, methodology for safeguarding intellectual property rights of intangible cultural heritage (ICH) becomes an important social issue, and the oral recording is being focusing as the reasonable method in South Korea. Through academic literatures, public documents, and interviews, I attempt to find causes and effects of the social phenomenon and search for a creative solution for safeguarding intellectual property rights of ICH and the oral recordings from it.
빌드업 필름의 선폭 6㎛급 패턴 가공을 위한 직접식 UV 레이저 프로젝션 애블레이션
손현기,박종식,정수정,신동식,최지연,Sohn, Hyonkee,Park, Jong-Sig,Jeong, Jeong-Su,Shin, Dong-Sig,Choi, Jiyeon 한국레이저가공학회 2014 한국레이저가공학회지 Vol.17 No.3
To directly engrave circuit-line patterns as wide as $6{\mu}m$ in a buildup film to be used as an IC substrate, we applied a projection ablation technique in which an 8 inch dielectric ($ZrO_2/SiO_2$) mask, a DPSS 355nm laser instead of an excimer laser, a ${\pi}$-shaper and a galvo scanner are used. With the ${\pi}$-shaper and a square aperture, the Gaussian beam from the laser is shaped into a square flap-top beam. The galvo scanner before the $f-{\theta}$ lens moves the flat-top beam ($115{\mu}m{\times}105{\mu}m$) across the 8 inch dielectric mask whose patterned area is $120mm{\times}120mm$. Based on the results of the previous research by the authors, the projection ratio was set at 3:1. Experiments showed that the average width and depth of the engraved patterns are $5.41{\mu}m$ and $7.30{\mu}m$, respectively.