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.

최한기의 기학적 지리학과 지리연구방법론

최원석(Won Suk Choi) 한국지역지리학회 2009 한국지역지리학회지 Vol.15 No.1

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.

백내장 수술 후 절개 방법에 따른 안압 변화 비교

최원석,신영주,김하경,이가영,Won Seok Choi,MD,Young Joo Shin,MD,PhD,Ha Kyoung Kim,MD,PhD,Kayoung Yi,MD,PhD 대한안과학회 2013 대한안과학회지 Vol.54 No.12

Purpose: In the present study we compared the intraocular pressure (IOP) after cataract surgery according to incisional techniques. <br /> Methods: Patients who underwent phacoemulsification with intraocular lens implantation were divided into 2 groups: clear corneal incision group (CC group), and scleral tunnel incision group (ST group). All complicated cases were excluded. IOP was measured preoperatively and at 1 week, 1, 3, 6, 12, 18 and 24 months after surgery.<br /> Results: Seventy-seven patients (100 eyes) were enrolled in the present study; CC group (28 patients, 33 eyes), ST group (49 patients 67 eyes). Preoperative IOPs in both groups were not significantly different (p = 0.908, student’s t-test). IOP in the CC group at 1 week after surgery significantly decreased 2.22 ± 2.57 mm Hg compared to preoperative IOP (p < 0.001, repeated-measures ANOVA with post hoc analysis), and the IOP of the ST group decreased 2.11 ± 2.50 mm Hg (p < 0.001, repeated-measures ANOVA with post hoc analysis). The lowered IOP was maintained for 24 months postoperatively. There was no significant difference in IOP change after surgery depending on incisional techniques (p = 0.848, repeated measures ANOVA).<br /> Conclusions: There may be no difference in IOP lowering effect after surgery depending on incisional techniques. <br /> J Korean Ophthalmol Soc 2013;54(12):1856-1861

Orthodontic Distal Movement of the Abutment Premolar to the Posterior Edentulous Area

최원석,Choi, Won-Seok Korean Academy of Esthetic Dentistry 2000 Journal of the Korean Academy of Esthetic Dentistr Vol.9 No.1

생강의 첨가가 분쇄막창의 저장특성에 미치는 영향

최원석,최웅규,Choi, Won-Seok,Choi, Ung-Kyu 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.5

This study was conducted to investigate the effects of ginger addition (1%, 5% and 10%) on the quality of ground pork rectum. No significant difference in the pH was found between raw and cooked pork rectum during storage; however, the pH of cooked rectum was slightly lower than raw rectum. The TBA value of the cooked pork rectum (0.25 mg/kg) was higher than raw pork rectum (0.1 mg/kg). In addition, the TBA values of both raw and cooked pork rectum increased as storage progressed. The TBA value was found to decrease in proportion to the amount of ginger added. The volatile basic nitrogen (VBN) values also decreased with the addition of ginger. Consequently, considering that the initial stage of decomposition was 30~40%, it was determined that it would be desirable to consume the raw and cooked pork rectum within 4 and 6 days of storage at $5^{\circ}C$, respectively. Further, it was found that the addition of 10% ginger could extend the storage period beyond the 4 days at $5^{\circ}C$. 신선한 암퇘지의 막창부위에 지방을 제거하고 파쇄기로 잘게 부수어 가열하지 않은 것과 $100^{\circ}C$의 autoclave에서 10분간 가열한 것에 분쇄한 생강을 1, 5 및 10%가 되게 첨가하여 polyethylene film으로 1차 포장한 후 알루미늄 호일로 2차 포장한 다음 $5^{\circ}C$에서 보관하면서 품질의 변화를 관찰하였다. 저장 중 pH는 첨가구 사이의 유의적인 차이를 나타내지 않았으나, 가열한 막창이 다소 낮은 값을 나타내었다. TBA가는 각각 0.1 mg/kg과 0.25 mg/kg으로 가열 막창이 생막창보다 높은 값을 나타내었으며, 두 처리구에서 모두 생강의 첨가가 TBA-value의 상승을 억제시켜 저장성을 연장시키는 것을 확인할 수 있었다. 휘발성 염기질소의 함량은 생강의 첨가로 감소하였으며, 30~40 mg%의 초기부패 판정기준을 고려할 때 생막창은 $5^{\circ}C$에서 4일, 가열막창은 6일 이내에 소비하는 것이 바람직할 것으로 판단되었다. VBN 함량을 기준으로 10% 생강의 첨가는 가열막창의 저장기간을 4일 가량 연장시킬 수 있는 것으로 확인되었다.

훈연공정을 첨가하여 제조한 발아콩 청국장의 품질특성

최원석,박화영,최웅규,Choi, Won-Seok,Park, Hwa-Young,Choi, Ung-Kyu 한국식품영양학회 2015 韓國食品營養學會誌 Vol.28 No.3

The aim of this study is to investigate the changes in the quality characteristics of cheonggukjang made with germinated soybeans, which is produced by the addition of a smoking process. The L value of smoked cheonggukjang made with germinated soybeans (SCGS) was higher than that of non-smoked cheonggukjang made with non-germinated soybeans (NCNS) and non-smoked cheonggukjang made with germinated soybeans (NCGS). The a value of NCNS was the highest, followed by NCGS and SCGS. The b and ${\Delta}T$ values had a similar tendency compared with the L value. The amino acids in NCGS were significantly decreased compared with NCNS, whereas no remarkable difference in amino acid content was observed between NCGS and SCGS. The moisture content of NCGS ($61.9{\pm}0.9%$) was increased by more than 8% compared with that of NCNS ($53.3{\pm}0.7%$). The moisture content of SCGS was significantly decreased compared with NCGS, whereas the moisture content of SCGS was higher than that of NCNS. The pH of SCGS was significantly the highest, followed by NCGS and NCNS. The viscous substance content of NCGS was significantly increased compared with that of NCNS. No remarkable difference in viscous substance content was observed between NCGS and SCGS. The number of aerobic bacteria in SCGS was significantly decreased compared with NCGS. The levels of total isoflavone in NCNS, NCGS, and SCGS were $1,573.9{\pm}62.5$, $1,759.1{\pm}65.8$, $1,738.0{\pm}68.1mg%$, respectively.

심장 치료 전후의 혈압 측정 인자의 변화에 관한 연구

최원석,Choi, Wonsuk 한국융합신호처리학회 2021 융합신호처리학회 논문지 (JISPS) Vol.22 No.2

상완 수축기 혈압과 맥압은 50세 이상의 개인에서 심혈관 질환의 예측 인자이다. 강성이 증가함에 따라 수축기 후기의 반사 진폭과 압력이 증가하여 좌심실 부하와 심근 산소 요구량이 증가한다. 따라서 강성이 혈압에 미치는 영향을 연구 할 필요가 있다. 본 연구에서는 약물 복용 전후에 혈압 맥파를 측정하고, 심부전 환자에서 심근 심장 이식 전후에 혈압 맥파를 측정하였다. Windkessel 모델의 R, L 및 C 구성 요소 간의 상관관계는 혈압을 높임으로써 추정되었다. 커브 피팅 방법을 사용하여 Windkessel 모델의 매개 변수를 모델링 한 결과 혈압의 증가와 수축기 상승 시간의 감소는 RLC Windkessel 모델의 L 성분이 증가했기 때문이다. 혈관의 다양한 기계적 특성 중에 높은 BP 파형에 영향을 미치는 가장 중요한 매개 변수는 실험결과로 이너턴스인 것을 증명하였다. The brachial systolic blood pressure and pulse pressure are the predictors of cardiovascular disease in individuals over 50 years of age. As the stiffness increases, the reflex amplitude and pressure in the late systole increase, resulting in an increase in left ventricular load and myocardial oxygen demand. Therefore, it is necessary to study how stiffness affects blood pressure. In this study, the blood pressure pulse waves were measured before and after taking the drug, and the blood pressure pulse wave was measured before and after myocardial heart transplantation in patients with heart failure. The correlation between R, L, and C components of the Windkessel model was estimated by increasing blood pressure. As a result of modeling the parameters of the Windkessel model using the curve fitting method, the increase in blood pressure and decrease in systolic rise time were due to the increase in the L component in the RLC Windkessel model. Among the various mechanical characteristics of blood vessels, the most important parameter affecting high BP waveform is the inertance.

Sensitiv Imago^TM 측정에 의한 야뇨증 환아의 검사 결과 보고

최원석,김덕곤,이진용,Choi, Won Seok,Kim, Deog Gon,Lee, Jin Yong 대한한방소아과학회 2014 대한한방소아과학회지 Vol.28 No.4

Objectives The purpose of this study is to report the nocturnal enuresis in children using Sensitiv $Imago^{TM}$. Methods Twenty nocturnal enuresis children were tested using Sensitiv $Imago^{TM}$. Results 10 cases showed the lowest score at filter $#5^*$ and 7 cases showed the lowest score at filter $6^*$ in {Express Monitoring} of {Review of System Disorders of Homeostasis}. Conclusions Further study with more samples is necessary to establish the accuracy of Sensitiv $Imago^{TM}$.

화재에 대한 상식과 비상식

최원석,Choi, Won-Seok 한국정보통신기술협회 2010 TTA저널 Vol.132 No.-

2003년 2월 18일 대구 지하철에서 방화로 인해 사망 192명, 부상 148명이라는 대형 참사가 발생했다. 그로부터 5년 후인 2008년 2월 11일에는 국민들이 안타까운 눈길로 지켜보는 가운데 우리나라 국보 1호인 숭례문이 방화로 인해 역사 속으로 사라져버렸다. 이렇게 화재에 대한 악몽은 잊혀질 만하면 다시 찾아오지만 아직까지 이에 대한 경각심 제고나 예방을 위한 투자에는 큰 변화가 없는 것이 현실이다. 이는 대부분이 강 건너 불구경 하듯 화재가 남의 일이라고 느끼기 때문일 것이다. 하지만 불은 항상 주변에 있기에, 언제든 우리 또한 화재의 피해자가 될 수 있다. 따라서 누구나 화재에 대해 기본적인 상식을 갖출 필요가 있다.