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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.
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.
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.
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
최원석(Won Suk Choi),조성래(Sungrae Cho) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.12b
본 논문에서는 무선 인체 통신 네트워크에서 응급 데이터를 전송할 때 전송 지연시간을 보장하는 DCTW(Dual Channel Transmission Scheme for WBAN)기법을 제안한다. 무선 인체 통신 네트워크에서는 의학적인 응용을 고려하고 개발되었기 때문에, 의학적 데이터의 중요도에 따른 차등 전송 기법이 필요하다. DCTW에서는 응급 데이터 프레임의 전송을 위하여 협대역 채널을 사용하며 일반 데이터 프레임 전송을 위하여 광대역 채널을 사용한다. 협대역 채널을 통하여 응급데이터를 전송하기 때문에 긴급한 데이터를 보내고자 하는 노드가 데이터를 신속히 전송할 수 있도록 하여 전송 지연시간을 효과적으로 감소시켰다. 본 논문은 다양한 성능 분석을 통해 DCTW 기법이 다른 기법에 비해 우수함을 증명하였다. In this paper, we propose a new medium access control protocol referred to as DCTW (Dual Channel Transmission Scheme for wireless body area networks). Wireless body area networks (WBANs) requires prioritization mechanism for life-critical data to transmit the data as early as possible. The proposed DCTW exploits a narrow band for transmitting life-critical data while it uses a broadband channel to transmit normal data. Since the narrow band is dedicated to life-critical data, the DCTW can effectively reduce the delay of life-critical data transmission. Through extensive simulation, we show the DCTW outperforms other existing schemes.
최원석(Won Suk Choi) 대한지리학회 2009 대한지리학회지 Vol.44 No.1
이 연구는 한국에서 풍수와 불교의 교섭이 언제 시작되었고 정치주도세력에 의해 어떻게 전개되었으며 그 결과 사회 및 풍수와 불교 상호간에 어떠한 영향을 미쳤는지를 탐구한 글이다. 역사상에서 풍수와 불교는 융합적인 문화형태로 교섭되어 사찰의 입지 및 기능, 사회ㆍ공간적 이데올로기의 형성, 풍수의 도입 및 확산, 비보사탑설의 전개 등에서 영향을 주었다. 풍수와 불교는 신라 하대에 선종의 전래를 계기로 본격적인 교섭을 시작하였고, 나말려초에는 사회변혁을 이끄는 공간적 이데올로기로 기능하였으며, 고려시대를 걸쳐서는 왕권의 중앙집중 및 지방의 효율적인 통어 체계를 구축하기 위한 이념적 장치로 적극 활용되었다. 조선시대에 와서 정치지배권에서의 불교와 풍수의 교섭은 쇠퇴되고 민간부문에서만 미약하게 유지되었다. In Korean history, Fengshui and Buddhism were closely connected in a harmonious and interrelated manner, together influencing the location and function of Buddhist temples, the forming of social and spatial ideologies, the spread of Fengshui, the development of Buddhist Bibo-Fengshui, etc. The interaction between Fengshui and Buddhism, which began after the introduction of Zen Buddhism in the late-Silla period, acted as a spatial ideology that empowered the powerful local gentries to trigger a social upheaval in the late-Silla period and was used by the government leaders for political purposes throughout the Goryeo period. In the Joseon period, the link between Buddhism and Fengshui weakened and was felt only at a grass-roots level.
순차적 구역픽킹에서 픽커 피로도 평준화를 위한 주문순서 결정문제
최원석(Won-suk Choi),임석철(Suk-chul Rim) 대한산업공학회 2010 대한산업공학회 춘계학술대회논문집 Vol.2010 No.6
본연구는 U자형 무동력 롤러 컨베이어 둘레에서 소품종의 소형 제품들에 대해 구역별(zoned) 순차적(pick-and-pass) 오더픽킹을 수행하는 물류센터에 대하여 총작업완료시간과 픽커들의 피로도를 고려하는 주문처리순서를 결정하는 문제를 다룬다. 본 논문에서는 각 픽커간에 배치된 대기공간(buffer)의 크기에 따라 각 경험적 알고리즘의 총작업완료시간과 픽커들의 피로도를 시뮬레이션으로 측정하여 분석하였다.