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Polymer-Assisted High-Resolution Printing Techniques for Colloidal Quantum Dots
양지웅,유지수,유원석,최문기 한국고분자학회 2021 Macromolecular Research Vol.29 No.6
Over the last several decades, colloidal quantum dots (QDs) have been widely studied because of their unique optical and electronical properties such as band gap tunability, extremely high color purity, and efficient light absorption and emission. Consequently, they have been regarded as promising materials for nextgeneration optoelectronic devices such as displays, image sensors, and solar cells. Because these devices employ solid state forms of colloidal QD ensembles, the development of the processes that can tailor their 3D architecture is essential. Here, this review article explores the recent progress of the high-resolution printing techniques for colloidal QDs. Specifically, we present a wide range of methods including photolithography, inkjet printing, nanoimprinting, and transfer printing. We also discuss how these printing methods have been inspired by the patterning techniques for polymer-based materials.
양지웅,임옥택 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
We compared the spray characteristics of a typical fuel (100% diesel, DME) and diesel-DME blended fuel in a constant volume combustionchamber (CVCC). The typical fuel (100% diesel, DME) and diesel-DME blended fuel spray characteristics were investigated atvarious ambient pressures (pressurized nitrogen) and fuel injection pressures using a common rail fuel injection system when the fuelmixture ratio was varied. The fuel injection quantity and spray characteristics were measured including spray shape, penetration length,and spray angle.
양지웅,이은숙,고준영,김원경,변재영,박진규,최원식,Yang, Ji-Ung,Lee, Eun-Suk,Ko, Joon-Young,Kim, Won-Kyung,Byun, Jae-Young,Park, Jin-Gyu,Choi, Won-Sik 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.6
Green houses provide a more conditioned and warmer environment than the outside environment due to insulation. Currently used insulation materials include soft film (PVC, PE, EVA), foamed PE sheet, non-woven fabric, reflective film, and multi-layer insulation curtain, but there are many disadvantages and to compensate for this, silica aerogel insulation material with excellent warmth, light weight, and small volume Research using is in progress. In this study, the temperature change of the quadruple-structure green house and the temperature change in the dual-structure green house of soft film and silica airgel were investigated. The daytime temperature change was highest in A and A2 (soft film) at 10 to 16:00 after sunrise, but showed the lowest temperature at 17 to 18:00, which is the sunset time, showing the greatest change. The airgels of D and D2 showed the smallest change in temperature after sunrise and right after sunset. That is, it can be said that the airgel is hardly affected by external temperature. The temperature change at night was highest in D and D2 (aerogel) for both quadruple and dual structures. The temperature at night was measured higher in the quadruple structure than in the double structure. As for the ratio of the internal temperature to the external temperature for the quadruple structure and the double structure, D (aerogel) was not affected by the external temperature during the day in the quadruple structure and the double structure. D (Aerogel) seems to be able to reduce the damage caused by high temperatures in summer due to the high thermal insulation effect of the airgel, as the temperature rises above 4℃ at night. And in winter, it helps to save heating costs due to less heat emitted to the outside.
양지웅 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Controlled synthesis of colloidal nanocrystals is one of the most important prerequisites to fully exploit their unique properties for a wide range of their applications. However, the formation mechanism of colloidal nanocrystals is not well studied, yet. In this presentation, I will present my research on the nanocrystal formation. First, I will talk about the II-VI semiconductor magic-sized nanoclusters, which are known as important prenucleation intermediates for nanocrystal synthesis. Second, I will discuss my research on in-situ liquid-phase transmission electron microscopy for studying colloidal nanocrystal formation process. At the end, I will briefly show the structure engineering of colloidal nanocrystal quantum dots for optoelectronic applications such as solar cells and light-emitting diodes.
교통신호등 형태별 운전자 인지반응 시간 비교 연구: 등화 색상 및 조합에 따른 비서술적/서술적 기억 활용
양지웅,김진태,김주영 대한교통학회 2018 대한교통학회지 Vol.36 No.4
국제사회는 3개 렌즈(적, 황, 녹) 교통신호등 사용을 표준으로 규정으로 하나, 우리나라는 4개(적, 황, 녹색화살표, 녹색) 렌즈 교통신호등의 사용을 일반적으로 허용한다. 본 연구는 국제연합 규정 3색 신호등 사용 운전자들의 인지반응 시간과 우리나라 규정 4색 신호등 사용 운전자들의 인지반응 시간이 같지 않음을 확인한다. 피(被)실험 운전자 40명으로부터 총 1,920개 인지반응 시간자료 및 뇌파 자료를 실내시험으로 수집하고 분석하였다. 분석결과 3색 신호등이 4색 신호등보다 신뢰수준 95%에서 (1) 해석 오류가 없고, (2) 인지반응 시간이 빠르며, (3) 인지반응 시간의 표준편차도 적은 것으로 도출되었다. 뇌파 자료 분석결과 3색 신호등은 비서술적 기억 영역(전두엽; 반응 빠름)이 활성화되고, 4색 신호등은 서술적 기억 영역(측두엽; 반응 상대적으로 느림)이 활성화됨을 확인하였다. 이로 우리나라 교통신호등이 교통안전에 유리한 방향으로 발전할 필요가 있음을 제언한다. This study analyzes drivers’ reaction times from the different ways to deliver the meaning of traffic signals based on previous research in Psychology that descriptive and non-descriptive memories in human’s cerebellums play in different roles. The meaning of traffic signal lights is delivered by either the color of light or the combination of those colors. Total 40 subjects asked to react various images of traffic signals and their 1,920 reaction time data were collected and analyzed. Results showed that three-head traffic signals delivering the meaning of traffic signals with its colors provide with less and stable reaction times, at 95% confidence level, compared to the ones of four-head traffic signals delivering with the combination of those. This study suggest a direction to change the types of traffic signal lights based on the findings from this study.