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기계적 롤링을 통한 수직배향 나노구조의 다용도 박막 프레임워크 변환
박태준(Tae Jun Park),최석민(Seok Min Choi),윤도경(Do Kyung Youn),이승조(Seungjo Lee),박재규(Jaekyu Park),이재혁(Jae Hyuk Lee),김정대(Jeong Dae Kim),이한길(Han Kil Lee),옥종걸(Jong G. Ok) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.4
We present a useful and practical manufacturing technique that enables the structural conversion of delicate as-grown nanostructures to more beneficial and robust thin-film frameworks through controlled mechanical rolling. Functional nanostructures such as carbon nanotubes grown through chemical vapor deposition in a vertically aligned and very loosely packed manner, and thus difficult to manipulate for subsequent uses, can be prepared in an array of thin blades by patterning the growth catalyst layer. They can then be toppled as dominos through precisely controlled mechanical rolling. The nanostructures formulated to horizontally aligned thin films are much more favorable for device applications typically based on thin-film configuration. The proposed technique may broaden the functionality and applicability of as-grown nanostructures by converting them into thin-film frameworks that are easier to handle and more durable and favorable for fabricating thin-film devices for electronics, sensors, and other applications.
Lee, Seungjo,Park, Byungho Korean Society for Emotion and Sensibility 2012 감성과학 Vol.15 No.4
This study investigated the impact of individual differences in motivational reactivity on cognitive effort, memory strength (sensitivity) and decision making (criterion bias) in response to Internet ads with positive and negative content. Individual variation in trait motivational activation was measured using the Motivational Activation Measurement developed by A. Lang and her colleagues (A. Lang, Bradley, Sparks, & Lee, 2007). MAM indexes an individual's tendency to approach pleasant stimuli (ASA, Appetitive System Activation) and avoid unpleasant stimuli (DSA, Defensive System Activation). Results showed that individuals higher in ASA exert more cognitive effort during positive ads than individuals lower in ASA. Individuals higher in DSA exert more cognitive effort during negative ads compared to individuals lower in DSA. ASA did not predict recognition memory. However, individuals higher in DSA recognized ads better than those lower in DSA. The criterion bias data revealed participants higher in ASA had more conservative decision criterion, compared to participants lower in ASA. Individuals higher in DSA also showed more conservative decision criterion compared to individuals lower in DSA. The theoretical and practical implications are discussed.
Study of hydrogenated a-SiGe cell for middle cell of Triple junction solar cell
박태진(Park, Taejin),백승조(Baek, Seungjo),김범준(Kim, Beomjoon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Hydrogenated a-SiGe middle cell for triple junction solar cell was investigated with various process parameters. a-SiGe I-layer was deposited at substrate temperature 245?C and hydrogen content(R) was up to 26.7. Low optical bandgap(1.45eV) of a-SiGe cell was applied for middle cell although a-SiGe single cell efficiency with low Ge content was higher. And this cell was applied to the middle cell of a glass superstrate type a-Si/a-SiGe/uc-Si triple junction solar cell. The triple junction solar cell was resulted in the initial efficiency of about 9%, area 0.25cm², under global AM 1.5 illumination.
기계적 소성 각인 기반 연속 고속 나노패터닝 시스템 개발
이승조(Seungjo Lee),오동교(Dong Kyo Oh),박재규(Jaekyu Park),김정대(Jeong Dae Kim),이재혁(Jae Hyuk Lee),옥종걸(Jong G. Ok) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
We develop a high-throughput nanopatterning system which enables continuous mechanical nanopattern inscribing on flexible substrates by using a rigid grating mold edge. We perform the conceptual design of process principle, specific modeling, and buildup of a real prototype of the system. Several important issues related to processing and controlling, covering precision motion, alignment, heating, and sensing, are carefully addressed to achieve successful nanopatterning in a continuous and high-speed fashion. By tuning the mold shape, temperature, force, and substrate material, various functional nanopatterns can be created with the desired profiles towards many potential applications involving electronics, photonics, displays, light sources, and sensors, particularly requiring large-area and flexible configurations.
마이크로나노그레이팅 경질 몰드 모서리의 연속적 각인 소성가공 기반 유연 마이크로나노패턴의 고속 연속 제작 공정시스템 개발
이승조(Seungjo Lee),오동교(Dong Kyo Oh),박재규(Jaekyu Park),김정대(Jeong Dae Kim),이재혁(Jae Hyuk Lee),옥종걸(Jong G. Ok) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.5
In this study, we develop a novel high-throughput micronanopatterning system that can implement continuous mechanical pattern inscribing on flexible substrates using a rigid grating mold edge. We perform a conceptual design of the process principle, specific modeling, and buildup of a real system prototype. This research also carefully addresses several important issues related to processing and controlling, including precision motion, alignment, heating, and sensing to enable a successful micronanopatterning in a continuous and high-speed fashion. Various micronanopatterns with the desired profiles can be created by tuning the mold shape, temperature, force, and substrate material toward many potential applications involving electronics, photonics, displays, light sources, and sensors, which typically require a large-area and flexible configurations.