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RISS 인기검색어
- 검색키워드
- 저자 : Jung Younsu (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Dhakal, Rajendra,Jung, Younsu,Park, Hyejin,Cho, Gyoujin,Kim, Nam Young Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>We present a low-power, cost-effective, highly reproducible, and disposable bandstop filter by employing high-throughput screen-printing technology. We apply large-scale printing strategies using silver-nanoparticle-based ink for the metallization of conductive wires to fabricate a bandstop filter on a polyethylene terephthalate (PET) substrate. The filter exhibits an attenuation pole at 4.35 GHz with excellent in-and-out band characteristics. These characteristics reflect a rejection depth that is better than −25 dB with a return loss of −0.75 dB at the normal orientation of the PET substrate. In addition, the filter characteristics are observed at various bending angles (0°, 10°, and 20°) of the PET substrate with an excellent relative standard deviation of less than 0.5%. These results confirm the accuracy, reproducibility, and independence of the resonance frequency. This screen-printing technology for well-defined nanostructures is more favorable than other complex photolithographic processes because it overcomes signal losses due to uneven surface distributions and thereby reveals a homogeneous distribution. Moreover, the proposed methodology enables incremental steps in the process of producing highly flexible and cost-effective printed-electronic radio devices.</P>
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Jinsoo Noh,Minhoon Jung,Younsu Jung,Chisun Yeom,Myungho Pyo,Gyoujin Cho IEEE 2015 Proceedings of the Institute of Electrical and Ele Vol.103 No.4
<P>This paper addresses the key issues that must be overcome to realize fully printed TFT-based flexible devices via commercially viable methods. In particular the threshold voltage (V<SUB>th</SUB>) variation in printed TFTs is a serious impediment to the successful launch of fully printed TFT-based devices in the market. The underlying causes of the V<SUB>th</SUB> variation in fully printed TFTs were analyzed by considering the misalignment of printed drain-source to gate electrodes, the rheology of electronic inks and effects from external sources of charge. By alleviating the influences of external sources of charge using a printed passivation layer, V<SUB>th</SUB> variation is maintained below 30% using a fully printed process. Based on the attainable variation range, the required number of integrated TFTs was estimated to fabricate a fully printed TFT-based radio frequency (RF) sensor device. A practical compromise enables fully printed RF sensors to be realized via the scalability of printing processes that mitigate V<SUB>th</SUB> variation by minimizing the level of TFT integration. Prototypes of fully printed RF sensors with human interactive capability-an RF sensor label, and an RF e-sensor (cyclic voltammetry) tag-are enabled with as few as 26 printed TFTs, demonstrating that low-cost and high throughput manufacturing of printed electronics is feasible.</P>
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Adhikari, Kishor Kumar,Jung, Younsu,Park, Hyejin,Cho, Gyoujin,Kim, Nam-Young Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>This paper presents a silver-nanoparticle-based, screen-printed, high-performance, dual-band, bandstop filter (DBBSF) on a flexible polyethylene terephthalate (PET) substrate. Using screen-printing techniques to process a highly viscous silver printing ink, high-conductivity printed lines were implemented at a web transfer speed of 5 m/min. Characterized by X-ray diffraction (XRD), optical microscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM), the printed lines were shown to be characterized by smooth surfaces with a root mean square roughness of 7.986 nm; a significantly higher thickness (12.2 <I>μ</I>m) than the skin depth; and a high conductivity of2×<SUP>107</SUP> S/m. These excellent printed line characteristics enabled the implementation of a high-selectivity DBBSF using shunt-connected uniform impedance resonators (UIRs). Additionally, the inductive loading effect of T-shaped stubs on the UIRs, which were analyzed using S-parameters based on lumped parameter calculations, was used to improve the return losses of the geometrically optimized DBBSF. The measured minimum return loss and maximum insertion loss of 28.26 and 1.58 dB, respectively, at the central frequencies of 2.56 and 5.29 GHz of a protocol screen-printed DBBSF demonstrated the excellent performance of the material and its significant potential for use in future cost-effective, flexible WiMax and WLAN applications.</P>
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Roll-to-Roll Gravure Printed Electrochemical Sensors for Wearable and Medical Devices
Bariya, Mallika,Shahpar, Ziba,Park, Hyejin,Sun, Junfeng,Jung, Younsu,Gao, Wei,Nyein, Hnin Yin Yin,Liaw, Tiffany Sun,Tai, Li-Chia,Ngo, Quynh P.,Chao, Minghan,Zhao, Yingbo,Hettick, Mark,Cho, Gyoujin,Jav American Chemical Society 2018 ACS NANO Vol.12 No.7
<P>As recent developments in noninvasive biosensors spearhead the thrust toward personalized health and fitness monitoring, there is a need for high throughput, cost-effective fabrication of flexible sensing components. Toward this goal, we present roll-to-roll (R2R) gravure printed electrodes that are robust under a range of electrochemical sensing applications. We use inks and electrode morphologies designed for electrochemical and mechanical stability, achieving devices with uniform redox kinetics printed on 150 m flexible substrate rolls. We show that these electrodes can be functionalized into consistently high performing sensors for detecting ions, metabolites, heavy metals, and other small molecules in noninvasively accessed biofluids, including sensors for real-time, <I>in situ</I> perspiration monitoring during exercise. This development of robust and versatile R2R gravure printed electrodes represents a key translational step in enabling large-scale, low-cost fabrication of disposable wearable sensors for personalized health monitoring applications.</P> [FIG OMISSION]</BR>
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드럼 세탁기 Spider의 피로수명 신뢰성 평가에 대한 연구
이성민(Seongmin Lee),조상봉(Sangbong Cho),조성진(Seongjin Jo),김영수(Youngsoo Kim),강동우(Dongwoo Kang),정연수(Younsu Jung),정보선(Bosun Chung) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The spider of a drum washing machine receives the repeated fatigue loadings during laundering. Although the spider is designed statically safely, it often happens fatigue failure. Therefore it requires the safe design for fatigue and needs the prediction of quantitative fatigue life. The S-N diagram for a spider material is developed by fatigue test and statistical analysis. The stresses are measured directly from strain gages on the spider. To predict the fatigue life of spider, the rainflow counting method and Miner"s rule are used. The data for fatigue life are analyzed statistically. From these data, reliability estimation for fatigue life can be done and also, equivalent fatigue life can be obtained. It will be applied to make and improve to a short period for design and prototype test.
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