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AMOLED 제조공정에 사용되는 Fine Metal Mask 용 얇은 Invar 합금의 진동자를 이용한 펨토초 레이저 응용 홀 드릴링
최원석,김훈영,신영관,최준하,장원석,김재구,조성학,최두선,Choi, Won-Suk,Kim, Hoon-Young,Shin, Young-Gwan,Choi, Jun-ha,Chang, Won-Seok,Kim, Jae-Gu,Cho, Sung-Hak,Choi, Doo-Sun 한국금형공학회 2020 한국금형공학회지 Vol.14 No.3
One of display trends today is development of high pixel density. To get high PPI, a small size of pixel must be developed. RGB pixel is arranged by evaporation process which determines pixel size. Normally, a fine metal mask (FMM; Invar alloy) has been used for evaporation process and it has advantages such as good strength, and low thermal expansion coefficient at low temperature. A FMM has been manufactured by chemical etching which has limitation to controlling the pattern shape and size. One of alternative method for patterning FMM is laser micromachining. Femtosecond laser is normally considered to improve those disadvantages for laser micromachining process due to such short pulse duration. In this paper, a femtosecond laser drilling for thickness of 16 ㎛ FMM is examined. Additionally, we introduce experimental results for controlling taper angle of hole by vibration module adapted in laser system. We used Ti:Sapphire based femtosecond laser with attenuating optics, co-axial illumination, vision system, 3-axis linear stage and vibration module. By controlling vibration amplitude, entrance and exit diameters are controllable. Using vibrating objective lens, we can control taper angle when femtosecond laser hole drilling by moving focusing point. The larger amplitude of vibration we control, the smaller taper angle will be carried out.
극초단 펄스 레이저를 사용한 유리 내부의 필라멘테이션에 대한 실험적 연구
최원석,윤지욱,김주한,최지연,장원석,김재구,최두선,황경현,조성학,Choi, Won-Suk,Yoon, Ji-Wook,Kim, Joohan,Choi, Jiyeon,Chang, Won-Seok,Kim, Jae-Goo,Choi, Doo-Sun,Whang, Kyoung Hyun,Cho, Sung-Hak 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.1
We have successfully formed filament inside of a transparent soda-lime glass using a Ti:sapphire based femtosecond laser. To make filament form, keeping the laser intensity higher than critical intensity is essential. Also each of the machining parameters plays an important role for the formation of filament. In this paper, we study what parameter can possibly influence for formation of filament, and we introduce an application using filamentation by femtosecond laser for transparent material.
공막연화증에서 조직접합제를 이용한 공막이식술, 자유자가결막이식술 및 일시적 양막이식술
최원석,이광자,박영정,이규원,Won Suk Choi,Gwang Ja Lee,Young Jeung Park,Kyoo Won Lee 대한안과학회 2011 대한안과학회지 Vol.52 No.12
Purpose: To evaluate the surgical results and complications arising from scleral graft and free conjunctival autograft using tissue adhesive and temporary amniotic membrane transplantation as the surgical treatment for scleromalacia. Methods: Scleral graft and free conjunctival autograft using tissue adhesive and temporary amniotic membrane transplantation was performed in 20 eyes of 20 patients with scleromalacia caused by pterygium excision. The surgical results and complications arising from the procedure were monitored and analyzed through follow-up. Results: During the follow-up period of 17.6 ± 5.9 months, the wound injection and edema at the free conjunctival autograft and operation site healed in all the cases except 1 at postoperative 1 month. The stability of the ocular surface for graft transplantation was maintained at postoperative 3 months. Although a partial absorption of the conjunctival autograft induced by careless treatment occurred 2 weeks postoperative in 1 case, the ocular surface stabilized due to suitable treatment after 6 months. Although the edges of the scleral graft in 3 patients were partially absorbed 6 months postoperatively, the ocular surface stability was maintained by covering the conjunctival autografts. Conclusions: For scleromalacia patients, scleral graft and free conjunctival autograft using tissue adhesive and temporary amniotic membrane transplantation rapidly stabilized the ocular surface and presented excellent aesthetic results. J Korean Ophthalmol Soc 2011;52(12):1405-1413
진동자를 이용한 하이브리드 극초단 펄스 레이저 초정밀가공시스템 개발 및 Cu-Zn합금 응용
최원석,윤지욱,조성학,강명창,Choi, Won-Suk,Yoon, Ji-Wook,Cho, Sung-Hak,Kang, Myung-Chang 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
In this paper, we describe experiment results using a vibration assisted hybrid femtosecond laser (${\lambda}$:795 nm) ultra-precision machining system. The hybrid system we have developed is possible that optical focal point of the femtosecond laser constantly and frequently within the range of PZT(piezoactuator) vibrator working distance. Using the hybrid system, We have experimented on brass and studied about differences of result of hole aspect ratio compare to general experiment setup of femtosecond laser system. Aspect ratio of a micro hole on brass is increased as 54% with 100 Hz vibration frequency and surface roughness of the side wall also improved compare to non-vibration.
2009년 발생한 신종인플루엔자 대유행에 대한 정책적 대응 평가
최원석,김우주,정희진,Choi, Won-Suk,Kim, Woo-Joo,Cheong, Hee-Jin 대한예방의학회 2010 예방의학회지 Vol.43 No.2
Objectives: To evaluate the policies on 2009 influenza pandemic in Korea at the end of first wave. Methods: The main policies and the estimation of these were described according to the progress of 2009 influenza pandemic. Results: The public health measures for containment were estimated to be successful in the early stage. The preparedness of antiviral agents and vaccines before the pandemic, risk-communication on pandemic influenza and policies of government including vaccines, and the education of health care worker and support of health care institutions was not enough to respond to the pandemic. Conclusions: The additional evaluation should be performed at the end of the pandemic in various aspects including health and socioeconomic effects.
최원석(Won Suk Choi) 한국지역지리학회 2011 한국지역지리학회지 Vol.17 No.3
전근대사회의 풍수는 마을주민들에게 있어서 오늘날의 문화생태적 환경과 같은 의미로 쓰였다. 마을사람들은 마을의 국지환경에 대해 풍수형국이라는 상징체계로 관계를 맺고 대응하였다. 마을 풍수를 통한 문화생태적 기능은 마을의 공간적 입지 규정, 인구 유입, 마을공동체의 생산·건축 활동 및 토지이용규제, 마을의 환경수용능력 규준, 환경관리, 주민공동체의 집단적 환경 의식 및 태도 형성 등으로 나타났다. 마을 풍수는 자연환경에 대한 주민들의 문화적 적응전략으로서, 마을의 지속가능한 환경시스템을 유지하기 위한 동아시아의 전통적인 문화생태적 방식이자 지식체계라고 평가할 수 있다. The meaning of fengshui was another cultural ecological environment in the pre-modern society in Korea. Village residents made interrelations with village natural environment by the medium of the geomantic landscape. The functions of cultural ecology through the village fengshui are as follows; the spatial location, the population inflow, the regulation of the community`s production or construction or land-use, the adjustment of the environmental carrying capacity, the environmental management, the forming of the collective environmental perception and attitude. Village fengshui is a cultural adaptation strategy to the local environment for the village residents. Fengshui can be evaluated as a traditional cultural ecological way and knowledge system for keeping sustainable village environment in East Asia.
최원석(Won-Suk Choi) 한국문화역사지리학회 2012 문화 역사 지리 Vol.24 No.3
동아시아의 산악문화는 역사, 종교, 생활사, 사상 등의 다방면에서 큰 문화적 비중을 차지한다. 이 글은 동아시아 산악문화를 구성하는 한 요소인 태산문화를 중국의 역사적 담론 전개와 한국의 문화적 수용양상의 측면으로 살폈다. 중국에서 태산을 둘러싼 정치ㆍ문화적 담론은 황제의 封禪,오악, 태산의 장백산 祖宗說, 민간신앙의 태산 등으로 요약될 수 있다. 한국에서 태산문화는 민간계층에 생활언어적이고 문화종교적인 면이 강하게 반영되었다. 그 양상은 생활용어로 기호화된 공간이미지, 지식인의 명산문화, 그림ㆍ지도 등의 지리지식과 지리정보, 태산 지명과 경관의 공간적 재현, 태산과 불교 신앙의 결합 등으로 나타났다. 태산문화의 공간적 수용 방식은 조선후기에 유교 이데올로기와 연계ㆍ매개되어 이루어졌다. This paper studied on Mt. Taishan discourses in China and Taishan culture in Korea. I searched for the effects of the Chinese Taishan and Taishan discourses to Korea, and searched for the accepting way on the formation of Korean Taishan culture. Chinese Taishan discourses are as follows, the emperor’s rite on Taishan, the five mountains and Taishanm the argument of the Taisha’s mountain range originate from Mt. Janbak(長白), Taishan of folk belief. Koran Taishan culture strongly showed the aspects of the people’s linguistic and folk belief, which through the mediums or connections of the linguistic spatial image, the intellectual’s famous mountain culture, the geographical knowledge and information like a map, Confucian ideology and Confucius, the folk Buddhism and indigenous belief.