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- 저자 : 곽선우(Sun-Woo Kwak) (검색결과 5 건)
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곽선우(Sun-Woo Kwak),유종수(Jong-Su Yu),한현숙(Hyun-Suk Han),김정수(Jung-Su Kim),이택민(Taik-Min Lee),김인영(Inyoung Kim) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.6
Solution processed conjugated molecules enable to manufacture various electronic devices by unconventional and cost effective patterning methods as screen or gravure printing. Spin-coating is the most popularly used method to form conjugated polymeric film for various electronic devices. The coating method has certain disadvantages such as a large amount of unwanted wastes, difficulty forming a film with a large area, and impossible to apply roll-to-roll manufacturing. We present here a promising alternative coating method, bar-coating for conjugated polymer film and OLED with the bar coated light emitting layer. In this papers, we show atomic force microscope images of spin- and bar-coated Poly[(9,9-di-n-octylfluorenyl-2,7- diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) films on substrate. The bar-coated film showed a slight lower RMS roughness (1.058 [nm]) than spin-coated film (1.767 [nm]). It means the barcoating is suitable method to form light emitting layers in OLEDs. By using bar-coating process, an OLED obtained with 4.7 [cd/A] in maximum current efficiency.
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PVP(polyvinylpyrrolidone)가 리버스 오프셋용 은 나노 잉크 물성에 미치는 영향
한현숙,곽선우,김봉민,이택민,김상호,김인영,Han, Hyun-Suk,Kwak, Sun-Woo,Kim, Bong-Min,Lee, Taik-Min,Kim, Sang-Ho,Kim, In-Young 한국재료학회 2012 한국재료학회지 Vol.22 No.9
Among the various roll-to-roll printing technologies such as gravure, gravure-offset, and reverse offset printing, reverse offset printing has the advantage of fine patterning, with less than 5 ${\mu}m$ line width. However, it involves complex processes, consisting of 1) the coating process, 2) the off process, 3) the patterning process, and 4) the set process of the ink. Each process demands various ink properties, including viscosity, surface tension, stickiness, and adhesion with substrate or clich$\acute{e}$; these properties are critical factors for the printing quality of fine patterning. In this study, Ag nano ink was developed for reverse offset printing and the effect of polyvinylpyrrolidone(PVP), used as a capping agent of Ag nano particles, on the printing quality was investigated. Ag nano particles with a diameter of ~60 nm were synthesized using the conventional polyol synthesis process. Ethanol and ethylene glycol monopropyl ether(EGPE) were used together as the main solvent in order to control the drying and absorption of the solvents during the printing process. The rheological behavior, especially ink adhesion and stickiness, was controlled with washing processes that have an effect on the offset process and that played a critical role in the fine patterning. The electrical and thermal behaviors were analyzed according to the content of PVP in the Ag ink. Finally, an Ag mesh pattern with a line width of 10 ${\mu}m$ was printed using reverse offset printing; this printing showed an electrical resistivity of 36 ${\mu}{\Omega}{\cdot}cm$ after sintering at $200^{\circ}C$.
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리버스 그라비아 옵셋 또는 그라비아 옵셋 프린팅을 이용한 조명용 OLED 소자 보조전극 형성 공정 연구
배성우(Sung Woo Bae),곽선우(Sun Woo Kwak),김인영(In Young Kim),노용영(Yong-Young Noh) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.6
The lighting devices using organic light emitting diodes (OLEDs) are actively researched because of the various advantages such as high power efficiency and 2-dimensitonal lighting emitting. To commercialize those OLED lighting devices, the manufacturing cost must be downed to comparable price with conventional light sources. Here, we demonstrate a reverse gravure-offset or gravure off-set printed metal electrode for the auxiliary electrode for OLED lighting devices. For the fabricated OLED’s auxiliary electrode, we used Ag nano-paste and printed metal grid structure with a line width and spacing of several ten and hundred micrometer by using gravureoffset printing. In the end the printing metal grid pattern are successfully achieved by optimization of various experimental conditions such as printing pressure, printing speed and printing delay time.
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한국어 남․여교사의 음성적 특징이 외국인 남성 학습자의 발화에 미치는 영향
윤은경(Yoon, Eun Kyung),곽선우(Kwak, Sun Woo) 동악어문학회 2016 동악어문학 Vol.66 No.-
본고의 주된 연구 목적은 외국인 남성 한국어 학습자의 발화에 나타나는 "여성성"이 한국어 남․여교사 발화와 관련이 있을 것으로 보고, 지각 실험을 바탕으로 산출 결과를 분석하는 것이다. 아울러 외국인 남성 학습자 발화의 남․여교사 발화에 따른 영향 관계를 살피고자 한다. 성별에 따른 교사 발화, 일반인 발화, 외국인 남성 학습자의 발화(총 21명)가 어느 정도로 여성성이 지각되는지를 20명의 청자들에게 likert scale로 평가하게 하였고, 이러한 여성성에 대한 지각적 판단을 기반으로 음높이, 음길이, 발화 속도, 핵억양의 패턴 등의 운율적 특징을 살펴보았다. 지각실험 결과 여성 교사의 경우 여성성 정도에 있어 일반 여성보다도 높은 점수를 받았으며, 남성 교사는 일반 남성보다 높은 점수를 받았을 뿐만 아니라 일반 여성과도 유사한 점수를 받은 경우도 발견되었다. 외국인 남성학습자의 경우에도 대체로 여성성의 정도가 강한 것으로 나타났다. 요컨대, 서법에 따라 차이는 있지만, 대체로 한국어 남성 교사발화는 일반인과 비교했을 때 음역대(pitch range)가 2배 가까이 넓었고, 말속도, 조음속도도 상당히 느린 것으로 나타났다. 아울러 경계 성조에서 상당히 긴 어말장음화가 관찰되었다. 마지막으로 핵억양 패턴은 일반 여성과 유사하게 나타나 여성스러운 발화에 노출되어 그와 유사한 음성적 특징을 갖는 것으로 나타났다. 본 연구의 결과를 더 나은 방향으로 교사 교육에 반영하고, 교사가 자신의 발화를 인식할 기회를 제공했다는 데 학문적 의의가 있다. This paper aims to analyze the phonetic characteristics of male Korean language teachers when they use feminine speech patterns. 20 listeners participated in the perception test to make assessments of the speech of male and female Korean language teachers, some subjects of the general public and male Korean language learners (a total of 21 people). In the perceptual test, female teachers received higher scores for feminine speech patterns than the other women, while male teachers received higher scores for feminine speech patterns than the other men. The scores of the male teachers were similar to those of the other women. Most male Korean language learners also showed strong feminine speech patterns. Based on the perceptual test of feminine speech patterns, prosodic characteristics such as speech pitch, length and speed and its core intonation patterns were also examined. The results differ across the sentence types. In general, the speech of the male Korean language teachers had a pitch range twice as large as that of the general public, while their speech speed and articulation rates were shown to be significantly slower. Furthermore, a significantly lengthened final utterance was observed in their boundary tones. Lastly, with core intonation patterns similar to those of the other women, they appeared to have phonetic characteristics corresponding to those of women, to the feminine speech. The findings of this study have implications for academic studies to shed a positive light on teacher education and provide opportunities for teachers to recognize their own speech patterns.
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고 정밀 롤 임프린팅을 이용한 유연 전자소자용 투명전극 제작
유종수(Jong-Su Yu),유세민(Semin Yu),곽선우(Sun-Woo Kwak),김정수(Jung Su Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.11
Transparent conductive films (TCF) with excellent electrical properties and high mechanical flexibility have been widely studied because of their potential for application in optoelectronic devices such as light-emitting diodes, paper displays and organic solar cells. In this paper, we report on low-resistance and high-transparent TCF for flexible device applications. To fabricate a high-resolution roll imprinted TCF, the following steps were performed: the design and manufacture of an electroforming stamp mold, the fabrication of high-resolution roll imprinted on flexible film, the manufacture of Ag-nano paste which was filled into patterned film using a doctor blade process. Also, we was demonstrated with the successful application(ITO free organic photovoltaic) of the developed flexible TCF.
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