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Ui Yeon Nam(남의연),Yu Mi Woo(우유미),Yeon Uk Kim(김연욱),Jae Hun Yang(양재훈),Pyeong An Kim(김평안),Jae Jun Lee(이재준),Jung Hwan Park(박정환) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Herein, a outstanding performance Cu nanowires with sheet resistance of 17Ω sq<SUP>-1</SUP> and transmittance of 88% was fabricated by flash-induced plasmonic nanowelding process. The high-intensity flashlight (in the region of visible wavelength) significantly enhanced plasmonic welding of Cu NW intersections without any oxidation. Simultaneously, near-infrared (NIR) spectrum of flash light interlocked the interface between polyethylene terephthalate substrate and Cu NWs. To investigate the adhesion enhacement of interlocked Cu NWs, we conducted a quantitative peel test. the measured NW interfacial fracture force increased by 208% compared to that of a pristine Cu NW electrode. To demonstrate versatile uses of flash-induced Cu NW conductors, transparent resistive memory devices and touch screen panel were successfully fabricated on plastics by employing the flash-welded excellent performance Cu NW network.
Kyung Uk Yi,Kook Lhim Zhin,Eun Ui Oh,Sang Suk Kim,Ho Bang Kim,Kwan Jeong Song 한국원예학회 2021 원예과학기술지 Vol.39 No.1
Dangyooza (DY), a Korean landrace citrus similar to pomelo (Citrus grandis L. Osbeck), has been consumed as a fruit and used in folk remedies to treat colds for centuries, and it is still used as a garden tree. DY has two natural variants, the buk-daengyooza (BDY) and the seol-daengyooza (SDY) based on distinguishable phenotypic fruit characteristics. However, there is little scientific analysis available not only on the morphological and chemical properties but also on the genetic basis of these natural variants. To gain a better understanding of DY, several morphological, phytochemical, chromosomal, and genetic traits were analyzed in DY and its natural variants, BDY and SDY. Morphological characteristics such as leaf and fruit shape, fruit hardness, and peel thickness were used to discriminate SDY from DY and BDY. Notably, SDY produced smaller fruit with thinner peels than those of DY and BDY. The major flavanones occurring in citrus were also markedly higher in SDY than those of DY and BDY. However, chromosomal configuration and genetic diversity analysis using random amplified polymorphic DNA, simple sequence repeat, and plastid trnL/F barcoding markers were unable to clearly discriminate the phylogenetic relationships among the DY types. This suggests that SDY might have arisen from somatic mutation, perhaps as a nucellar seedling.
고분자캐패시터에 대한 충방전 조건에서의 온도에 따른 정전용량감소 특성 연구
정의효(Ui-Hyo Jeong),임홍우(Hong-Woo Lim),형재필(Jae-Phil Hyung),고민지(Min-Ji Ko),정창욱(Chang-Uk Jung),조정하(Jeong-Ha Cho),장중순(Joong-Soon Jang) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.1
Purpose: Polymer capacitors are known to have very high reliability as compared with liquid electrolytic capacitors, but their capacity has been reported to decrease in charge and discharge at low temperature. The purpose of this study to clarify these characteristics. Methods: In order to clarify these characteristics, charging-discharging tests were carried out for 200 hours with three different capacities and at 5 different temperature from 5℃ to 100℃. Results: As a result of the test, it was confirmed that the capacity of the polymer capacitor was decreased with higher capacity and lower temperature. Conclusion: Such a failure phenomenon was caused by the shrinkage and expansion characteristics of the polymer used therein, it is presumed that this failure phenomenon is due to the complex pore structure made by etching.