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김영찬 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
The symmetric naphthothiazolo carbocyanine is of industrial importance as red-sensitizing dye in the spectral sensitization of emulsion microcrystals in negative film-making. The stability on the solvents of naphthothiazolo carbocyanine dye was measured by UV-Vis spectrophotometer, and then all of solvents were stabilized sensitizer. The maximum absorption peak range in various solvents was $600nm{\sim}612nm$ 수식 이미지. But it was identified that only methanol can be used to photographic emulsion.
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사진유제용 Green-Sensitizing Dye의 합성
김영찬 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
The symmetric naphthothiazolo carbocyanine is of industrial importance as green-sensitizing dye in the spectral sensitization of emulsion microcrystals in negative film-making. In this study, green-sensitizing dye was prepared by the reaction of 2-methyl-3-sulfopropyl-5-phenyl-benzoxazolium(inner salt) with triethyl orthoacetate in the presence of triethylamine. The product was identified by using various analytical tools such as Elemental analyzer, IR spectrophotometer, UV-Vis spectrophotometer, $^1H$ 수식 이미지-NMR spectrometer, TGA and DSC. The maximum absorption peak in methanol solvent was 502nm. Therefore, it was concluded that benzoxazolo carbocyanine dye can be used as green-sensitizing dye for the spectral sensitization of photographic emulsion.
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초탄성 형상기억합금을 적용한 선행압축 폴리우레탄 댐퍼의 거동 특성 검증
김영찬,허종완 대한토목학회 2023 대한토목학회논문집 Vol.43 No.4
Among the seismic structures for reducing earthquake damage, the seismic control structure is a technology that can efficiently improve seismic performance and secure economic feasibility by simply applying a damper. However, existing dampers have limitations in terms of durability due to required seismic performance and material plasticity. In this study, we proposed a polyurethane damper with enhanced recovery characteristics by applying precompression to polyurethane, which basically shows elastic characteristics, and applying superelastic shape memory alloy (SSMA). To verify the characteristics of the polyurethane damper, the concept was first established, and the design details were completed by selecting SSMA and steel, and selecting the precompression size as design variables. In addition, structural tests were conducted to derive response behavior and analyze force resistance performance, residual displacement, recovery rate, and energy dissipation capacity. As a result of the analysis, the polyurethane damper showed that various performances improved when the SSMA wire was applied and the precompression increased. 지진피해 감소를 위한 내진 구조 중에서 제진 구조는 댐퍼의 간단한 적용으로 효율적으로 내진 성능을 향상시키고 경제성을 확보할 수 있는 기술이다. 그러나 기존의 댐퍼는 요구 내진 성능과 재료 소성으로 인한 내구성에 대하여 한계를 나타낸다. 따라서 본 연구에서는 기본적으로 탄성 특성을 나타내는 폴리우레탄에 선행 압축을 가하고 초탄성 형상기억합금을 적용하여 복원 특성을 증진시킨 폴리우레탄 댐퍼를 제안하였다. 폴리 우레탄 댐퍼의 특성을 검증하기 위하여 우선 개념을 정립하고 초탄성 형상기억합금과 강재 적용, 선행압축 크기를 설계 변수로 선정하여 설계 상세를 완성하였다. 또한, 구조 실험을 수행하여 응답 거동을 도출하여 하중 저항 성능, 잔류 변위, 회복률, 에너지 소산 능력을 분석하였다. 분석한 결과 폴리우레탄 댐퍼는 초탄성 형상기억합금 와이어를 적용하고 선행 압축이 증가하면 다양한 성능이 향상되는 결과를 나타냈다.
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목표물 신호 모니터링 및 SPGD 알고리즘 기반 3 채널 타일형 결맞음 빔결합 시스템 연구
김영찬,윤영선,김한솔,장한별,박재덕,최윤진,나정균,이주한,강현구,여민수,최규홍,노영철,정윤찬,이혁재,유봉안,염동일,전창수,Kim, Youngchan,Yun, Youngsun,Kim, Hansol,Chang, Hanbyul,Park, Jaedeok,Choe, Yunjin,Na, Jeongkyun,Yi, Joohan,Kang, Hyungu,Yeo, Minsu 한국광학회 2021 한국광학회지 Vol.32 No.1
We have studied a tiled-aperture coherent-beam-combining system based on constructive interference, as a way to overcome the power limitation of a single laser. A 1-watt-level, 3-channel coherent fiber laser and a 3-channel fiber array of triangular tiling with tip-tilt function were developed. A monitoring system, phase controller, and 3-channel phase modulator formed a closed-loop control system, and the SPGD algorithm was applied. Eventually, phase-locking with a rate of 5-67 kHz and peak-intensity efficiency comparable to the ideal case of 53.3% was successfully realized. We were able to develop the essential elements for a tiled-aperture coherent-beam-combining system that had the potential for highest output power without any beam-combining components, and a multichannel coherent-beam-combining system with higher output power and high speed is anticipated in the future.
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