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All printed edge-triggered register using single walled carbon nanotube-based thin film transistor.
Noh, Jinsoo,Jung, Minhun,Jung, Kyunghwan,Lee, Gwangyong,Lim, Soyeon,Kim, Daae,Subramanian, Vivek,Cho, Gyoujin American Scientific Publishers 2012 Journal of nanoscience and nanotechnology Vol.12 No.5
<P>We have studied the fabrication of Single Walled Carbon Nanotube (SWNT)-based Thin Film Transistors (TFTs) using Roll-to-Roll (R2R) gravure printer and inkjet printer on PET foils to show the possibility of printed electronics in point of mass production and low cost. In this paper, for realization of all printed multi-bits digital circuit, all printed positive-edge triggered master-slave D flip-flop (DFF) was fabricated on PET foil using printed SWNT TFTs. The printed DFF, consists of 8 NAND gates and 4 inverters, exhibit propagation delay of 75 ms at the input clock signal of 5 Hz.</P>
Fully Gravure-Printed Flexible Full Adder Using SWNT-Based TFTs
Jinsoo Noh,Kyunghwan Jung,Joonseok Kim,Sungho Kim,Sungho Cho,Gyoujin Cho IEEE 2012 IEEE electron device letters Vol.33 No.11
<P>A single-walled carbon nanotube (SWNT)-based 1-b full-adder circuit was realized on flexible plastic substrates through an all gravure printing process by minimizing intertransistor process variation and leakage current between crossing interconnects. The circuit comprised 27 printed SWNT thin-film transistors, with a variation of up to only ±25% in electrical characteristics among them. Furthermore, the circuit showed a maximum propagation delay of 13.7 ms, with a 50-Hz input signal, and a supply voltage of -20 V. The process could be used for low-cost flexible arithmetic logic units in a variety of applications.</P>
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>
Scalability of Roll-to-Roll Gravure-Printed Electrodes on Plastic Foils
Jinsoo Noh,Dongsun Yeom,Chaemin Lim,Hwajin Cha,Jukyung Han,Junseok Kim,Yongsu Park,Subramanian, Vivek,Gyoujin Cho IEEE 2010 IEEE transactions on electronics packaging manufac Vol.33 No.4
<P>Roll-to-roll (R2R) gravure printing is considered to be a leading technology for the production of flexible and low-cost printed electronics in the near future. To enable the use of R2R gravure in printed electronics, the limits of overlay printing registration accuracy (OPRA) and the scalability of printed features with respect to the physical parameters of the gravure system, including given plastic substrates and inks, should be characterized. Important parameters of printed lines include surface roughness, thickness, line widening, and line-edge roughness. To date, there are no comprehensive reports regarding the limits of OPRA and the scalability of printed electrodes, including the control of surface roughness, thickness, line widening, and line-edge roughness using R2R gravure printing. In this paper, we examine ways of evaluating the OPRA limit of our gravure system. We find that OPRA is limited in the web moving direction to 40 μm and in the perpendicular direction to 16 μm, showing the importance of web handling on registration. Furthermore, we demonstrate the scalability of printed electrodes formed using a R2R gravure system to linewidths of 317 μm, with 440 nm thickness, 30 nm of surface roughness and edge waviness of 4 μm on PET foils, and describe optimization strategies to realize improved surface roughness, thickness, line widening, and line-edge roughness for future printed electronics applications.</P>
Design of Multi-modal Biometrics System and Sensor Network Security System based on USN
Jinsoo NOH,Kanghyeon RHEE 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we implement a multi-modal biometrics system to support various ubiquitous sensor network application services. The proposed system consists of a speech, a face, a palmprint recognition module and USN sensor network module. The speech recognition module has the psychoacoustic model, FFT(Fast Fourier Transform) and LDPC(Low Density Parity Check), the face and palmprint recognition’s main algorithms are PCA(Principle Components Alnalysis) and Invarient moments respectively . The proposed system is inserted in a HOST PC to use sensor energy effectively. To improve accuracy, a FEC (Forward Error Correction) system is also implemented in the system and optimized the simulation coefficient.