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Sinh, Le Hoang,Hong, Jeong‐,Mi,Son, Bui Thanh,Trung, Nguyen Ngoc,Bae, Jin‐,Young Wiley Subscription Services, Inc., A Wiley Company 2012 Polymer composites Vol.33 No.12
<P><B>Abstract</B></P><P>In this article, thermally conductive and relatively low dielectric constant polymer matrix composites of an aluminum nitride filler (AlN) and a novel liquid crystalline copoly(ester amide) (LCP) were prepared via a solution blending method in the presence of a phosphate containing dispersant. The viscosities, thermal conductivities, and dielectric properties of the prepared AlN/LCP composites were investigated as a function of AlN loading. Our experimental results demonstrated that the AIN/LCP composite with AlN concentration of 50 wt% had 2.5 times higher thermal conductivity than pure LCP (2.020 and 0.817 W/mK for composite with 50 wt% of AlN and pure LCP, respectively), but its dielectric constant remained at low level, i.e., < 9.0 at frequency of 900 Hz. In addition, viscosities of AlN/LCP pastes in the <I>N</I>‐methyl‐2‐pyrrolidinone solvent remained at acceptable levels with the high AlN loading of 50 wt%. The morphologies of the prepared composites were also investigated by scanning electron microscopy. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers</P>
Trung-Sinh Dang,Anh-Dung Tran,이범선,윤상웅 한국전자통신연구원 2013 ETRI Journal Vol.35 No.3
This letter presents a power amplifier (PA) with an on-chip power detector for 2.4-GHz wireless local area network application. The power detector consists of a clamp circuit, a diode detector, and a coupled line directional coupler. A series inductor for an output matching network in the PA is combined with a through line of the coupler, which reduces the coupling level. Therefore, the coupler employs a metamaterial-based transformer configuration to increase coupling. The amount of coupling is increased by 2.5 dB in the 1:1 symmetric transformer structure and by 4.5 dB from two metamaterial units along the coupled line.
A Broadband On-chip Power Divider up to W-band with Three-dimensional Three-coupled Lines
Trung-Sinh Dang,Nhut-Tan Doan,Byung-Sung Kim,Nam-Yoon Kim,Chang-Woo Kim,Sang-Woong Yoon 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.1
A state-of-the-art broadband on-chip power divider in millimeter-wave up to 103 GHz is presented. The power divider employs novel three-dimensional (3-D) three-coupled lines to achieve the desired mode impedances for an extremely wideband characteristic. The power divider was implemented in TSMC 180 nm RF CMOS IC technology with six metal layers. Measurements show the absolute bandwidth from 11 to 103 GHz with matching conditions of all of the ports and isolation between two outputs of less than -10 dB. The fractional bandwidth is 161.4%. The insertion loss is between 1.2 and 7.9 dB across the overall bandwidth. The core size of the power divider is 0.18 mm × 0.68 mm.
Modified Graphene Oxide-Based Adsorbents Toward Hybrid Membranes for Organic Dye Removal Application
( Thi Sinh Vo ),( Khin Moe Lwin ),( Sun Choi ),( Kyunghoon Kim ) 한국복합재료학회 2022 Composites research Vol.35 No.6
In this study, the channels-contained hybrid membranes have been fabricated through the incorporation of glass fibers and GO sheets (GO/glass fibers, GG), or a mixture of chitosan/GO (CS/GO/glass fibers, CGG), as hybrid membranes using in organic dye removal. The material properties are well investigated the terms in the morphological, chemical, crystal, and thermal characterizations for verifying interactions in their formed structure. These hybrid membranes have been fitted well in pseudo-second order and Langmuir models that are associated with chemical adsorption and a monolayer approach, respectively. The highest adsorption ability of methylene blue and methyl orange reached 59.40 mg/g and 229.07 mg/g (GG); and 287.47 mg/g and 252.91 mg/g (CGG), which is more enhanced than that of previous GO-based other adsorbents. Moreover, the dye separation on these membranes could be favorable to superb sealing and trapping dye molecules from water instead of only the dye connection occurring on their surface, regarding the physically sieving effect. The membranes can also be reused within two and three adsorbing-desorbing cycles on the GG and CGG ones, respectively. These membranes can become future adsorbents to be applied for wastewater treatment due to their structural features.
EXPONENTIAL STABILITY OF A CLASS OF NONLINEAR DIFFERENCE EQUATIONS IN BANACH SPACES
Nguyen, Sinh Bay,Le, Van Hien,Hieu, Trinh Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.4
The problems of global and local exponential stability analysis of a class of nonlinear non-autonomous difference equations in Banach spaces are studied in this paper. By a novel comparison technique, new explicit exponential stability conditions are derived. Numerical examples are given to illustrate the effectiveness of the obtained results.