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Reliability based optimization design method for brittle e-printed pattern in R2R process
Ho Anh Duc Nguyen,Jin Hyun Ahn,Kee Hyun Shin 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
Thin film brittle electronic film manufacturing is very sensitive with internal stress on pattern in R2R process. The process induced internal stresses, such as operating tension and bending stress, are the main factors which reduce the stability of thin film pattern. In practice, there exists the uncertainty of the R2R process parameter e.g., 2% tension variation, un-uniform web/pattern thickness, varying Young modulus of the substrate and pattern. Consequently, the deterministic optimization method cannot ensure the reliability of the design. This study presents a method for optimization design considering the process parameter uncertainty. The mathematical model is derived to calculate the internal stress in pattern under the tension and bending force by roller simultaneously. Using Monte Carlo method simulate the pattern stress under the uncertainty of the inputs and parameters. Reliability analysis is carried out to determine the most reliable sample. The result is verified by the experimental results.
Effect of Nip Force on Ink Transfer in High Resolution Roll-to-Roll Printing
Nguyen Ho Anh Duc,신기현,이창우 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.3
In this paper, the effect of the nip force on the ink transfer in gravure printings was investigated. An adhesive force-based ink transfermodel was suggested. This model is a function of the contact length between the ink and the substrate. The static simulation of theelastic deformation of the substrate was implemented under different nip forces. The simulation showed that the contact length (LIS)was increased as the nip force increased. Accordingly, the ink transfer ratio was increased as the nip force increased due to anincreased contact length LIS. However, the fidelity of the printed pattern at high resolutions could deteriorate if the nip pressure wastoo high, especially when the doctoring ratio was greater than 1. Finally, experiments were conducted to verify the effect of the nipforce, which showed good agreements with predicted results. The results of this study may be used as practical guidelines indetermining the optimal range of the nip force in R2R gravure printing at high resolutions.
Nguyen, Ho Anh Duc,Shin, Kee-Hyun,Lee, Dongjin IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.5
<P>Recently, printing pattern in high resolution (line width <20 mu m) has been given a great interest in the field of printed electronics for application of organic photovoltaic and fast integrated circuits. Improving the grid electrode could reduce the optical loss and the resistance loss thereby increasing conversion efficiency of solar cells. For higher performance transistors, it is necessary to scale channel length below 10 mu m to achieve MHz operations. To enable to build up pattern with high fidelity demands a study on the effect of process parameters in gravure printing. In this paper, a mathematical model is proposed to analyze the mechanism of the ink spreading on the substrate based on squeezing flow theory between parallel plates. It was proven that process parameters such as nip force, printing speed and viscosity of ink are significant factors contributing to the resulting printed line width. Finally, the experimental investigation on the effect of such parameters demonstrated that a high printing speed, low nip force and high viscosity of ink could decrease the ink spreading thereby gaining high fidelity. This work could be utilized as a guideline to set up the operating conditions to maintain the fidelity of printed line width in high resolution roll-to-roll gravure printing. (C) 2014 The Japan Society of Applied Physics</P>
Nguyen, Ho Anh Duc,Lee, Sang Hoon,Shin, Kee-Hyun,Lee, Sangyoon IOP Publishing 2014 Japanese journal of applied physics Vol.53 No.5
<P>One of the major factors that determine the performance of printed parallel-plate capacitors is the thickness of the dielectric layer; the thickness is affected significantly by the surface roughness of the conductive layer underneath the dielectric layer. In this study, we employed a calendering process to reduce the surface roughness of the first conductive layer. After a set of experiments involving a calendering process, the Taguchi method was applied to determine the optimal setting of the process parameters in terms of speed, nip pressure, and temperature. In the Taguchi method, a three-level orthogonal array was used to decide the signal-to-noise ratio. In addition, analysis of variance and F-test values were used to determine the most significant process parameters that affect the output, i.e., capacitance. Validation tests were carried out using the optimal levels of the process parameters and the results were presented. These results can be used as a practical guideline for determining optimal parameters in a calendering process for printed electronics applications. (C) 2014 The Japan Society of Applied Physics</P>
Nguyen, Van-Toan,Tran, Quoc Chinh,Quang, Nguyen Duc,Nguyen, Ngoc-Anh,Bui, Van-Tien,Dao, Van-Duong,Choi, Ho-Suk Elsevier 2018 Journal of alloys and compounds Vol.766 No.-
<P><B>Abstract</B></P> <P>The improvement of the catalytic performance for methanol and formic acid oxidation reactions remains a key issue for the development of a new generation of direct methanol and formic acid fuel cells. This study reports a simple approach, using selective chemical etching for the synthesis of unique nitrogen-doped carbon dot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> (N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB>) nano-network structure at room temperature with excellent electrocatalytic properties. The obtained nano-network hybrid material exhibits significant enhancement of the electrocatalytic activity for the electro-oxidation reaction of both methanol and formic acid with current densities of 999.0 and 1919.5 mA/mg<SUB>metal</SUB>, respectively, compared with the commercial ones of 751.32 and 806.02 mA/mg<SUB>metal</SUB>, respectively. Furthermore, the N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> nano-network hybrid materials exhibit excellent stability and hydrophilic dispersibility at room temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-Cdot/PtPd nanonetwork hybrid material is synthesized at room temperature. </LI> <LI> A simple coreduction and a selective chemical etching are applied to the synthesis. </LI> <LI> It generates a nano-network structure with excellent electrocatalytic properties. </LI> <LI> N-Cdot functions as a uniform interconnection between the nanohybrid materials. </LI> <LI> The hybrid exhibits significant enhancement of the activity for both MOR and FAOR. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Truong, Anh Duc,Rengaraj, Deivendran,Hong, Yeojin,Tran, Ha Thi Thanh,Dang, Hoang Vu,Nguyen, Viet Khong,Lillehoj, Hyun S.,Hong, Yeong Ho MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.9
<P>The activating leukocyte immunoglobulin-like receptors (LILRAs) play an important role in innate immunity. However, most of the LILRA members have not been characterized in avian species including chickens. The present study is the first attempt at cloning, structural analysis and functional characterization of two LILRAs (LILRA2 and LILRA6) in chickens. Multiple sequence alignments and construction of a phylogenetic tree of chicken LILRA2 and LILRA6 with mammalian proteins revealed high conservation between chicken LILRA2 and LILRA6 and a close relationship between the chicken and mammalian proteins. The mRNA expression of <I>LILRA2</I> and <I>LILRA6</I> was high in chicken HD11 macrophages and the small intestine compared to that in several other tissues and cells tested. To examine the function of LILRA2 and LILRA6 in chicken immunity, <I>LILRA2</I> and <I>LILRA6</I> were transfected into HD11 cells. Our findings indicated that LILRA2 and LILRA6 are associated with the phosphorylation of Src kinases and SHP2, which play a regulatory role in immune functions. Moreover, LILRA6 associated with and activated MHC class I, β2-microglobulin and induced the expression of transporters associated with antigen processing but LILRA2 did not. Furthermore, both LILRA2 and LILRA6 activated JAK-STAT, NF-κB, PI3K/AKT and ERK1/2 MAPK signaling pathways and induced Th1-, Th2- and Th17-type cytokines and Toll-like receptors. Collectively, this study indicates that LILRA2 and LILRA6 are essential for macrophage-mediated immune responses and they have the potential to complement the innate and adaptive immune system against pathogens.</P>
박장훈,Nguyen Ho Anh Duc,박성식,이종수,김범순,이동진 한국물리학회 2015 Current Applied Physics Vol.15 No.3
This study introduces mass-producible roll-to-roll (R2R) gravure printed patterns with good printability and functionality. Ag flake materials and polyimide (PI) film substrates were used in this experiment. To confirm mass production potential, a large-scale R2R gravure machine was used, and lengthy printing times were used in the process (6.5 h). It was attempted to print a 30- to 120-μm fine-line pattern (groove type) and a 200- to 1000-mm-wide (dot type) nominal pattern. Various printed width and thickness values were obtained using many measurement sets to confirm the repeatability of each pattern for lengthy process times. We obtained a 45- to 1000-μm pattern width and a 1- to 5-μm thickness. Moreover, resistivity of the printed pattern was also achieved in the range of 5.4-18 μΩ cm. A peel-off test was performed using a standardized method. Finally, this paper presents the achieved optimized process condition and the results of this study.