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Planar super-wideband loop antenna with asymmetric coplanar strip feed
Trinh-Van, Son,Kwon, Gina,Hwang, Keum Cheol IET 2016 Electronics letters Vol.52 No.2
<P>A planar super-wideband (SWB) antenna fed by an asymmetric coplanar strip is proposed, fabricated, and tested. The antenna consists of a hexagonal loop strip in which a signal strip is prolonged, curved, and shorted to a ground plane to facilitate SWB characteristics. In addition, by adding a boomerang-shaped strip to the ground plane, the effective electrical length is increased, thereby decreasing the lowest operating frequency. The simulated results show that the proposed antenna exhibits a -10 dB reflection bandwidth from 1.18 to 49.22 GHz corresponding to a ratio bandwidth of 41.7:1. The measured results of the fabricated antenna are also represented and compared with the simulated results. The antenna gain changes from 2.05 to 10.62 dBi within the measured frequency range.</P>
Waveguide Slot Array Antenna with a Hybrid-Phase Feed for Grating Lobe Reduction
Trinh-Van, Son,Song, Sung Chan,Seo, Seung-Hee,Hwang, Keum Cheol Hindawi Limited 2016 International journal of antennas and propagation Vol.2016 No.-
<P>The design of a 112-element millimeter-wave waveguide slot array antenna to reduce the grating lobe level is presented. A hybrid-phase feeding technique combining a cophase feed and an alternating-phase feed is applied to facilitate the suppression of grating lobes. In addition, a stepped feed waveguide and offset coupling slots aligned in a line are employed to realize a tapered aperture distribution. As a result, grating lobe suppression of 8.1 dB was achieved on the diagonal planes compared to a conventional alternating-phase-fed waveguide slot array antenna. A prototype of the proposed antenna was fabricated and measured. The measured results show that the proposed antenna exhibits a −15 dB reflection bandwidth of 3.4%and an average realized gain of 26.72 dBi within the measured frequency range. Good agreement between the simulated and measured radiation patterns is also observed.</P>
Effect of Cr, Mo and W on the Microstructure of Al Hot Dipped Carbon Steels
( Trinh Van Trung ),( Min Jung Kim ),( Soon Yong Park ),( Poonam Yadav ),( Muhammad Ali Abro ),( Dong Bok Lee ) 한국부식방식학회(구 한국부식학회) 2014 Corrosion Science and Technology Vol.13 No.1
A low carbon steel, Fe-2.25%Cr steel (ASTM T22), and Fe-2.25%Cr-1.6%W steel (ASTM T23) were aluminized by hot dipping into molten Al baths. After hot-dipping, a thin Al-rich topcoat and a thick alloy layer formed on the surface. The topcoat consisted primarily of a thin Al layer that contained a small amount of Fe, whereas the alloy layer consisted of Al-Fe intermetallics such as Al5Fe2 and AlFe. Cr, Mo, and W in T22 and T23 steels reduced the thickness of the topcoat and the alloy layer, and flattened the reaction front of the aluminized layer, when compared to the low carbon steel.
( Trinh Van Trung ),( Sun Kyu Kim ),( Min Jung Kim ),( Seul Ki Kim ),( Sung Jun Bong ),( Dong Bok Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.8
Medium carbon steel was aluminized by hot dipping into molten Al or Al-1 at% Si baths. After hot-dipping in these baths, a thin Al-rich topcoat and a thick alloy layer rich in Al5Fe2 formed on the surface. A small amount of FeAl and Al3Fe was incorporated in the alloy layer. Silicon from the Al-1 at% Si bath was uniformly distributed throughout the entire coating. The hot dipping increased the microhardness of the steel by about 8 times. Heating at 700-1000, however, decreased the microhardness through interdiffusion between the coating and the substrate. The oxidation at 700-1000 in air formed a thin protective a-Al2O3 layer, which provided good oxidation resistance. Silicon was oxidized to amorphous silica, exhibiting a glassy oxide surface.
Van Trinh, Pham,Lee, Junho,Minh, Phan Ngoc,Phuong, Doan Dinh,Hong, Soon Hyung Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.769 No.-
<P><B>Abstract</B></P> <P>In this paper, oxidized-silicon carbide particle/aluminum 6061 (oxidized-SiC<SUB>p</SUB>/Al6061) composites were fabricated using a spark plasma sintering technique. The microstructure, mechanical properties, and wear behavior of oxidized-SiC<SUB>p</SUB>/Al6061 composites were investigated. The results revealed an improvement in interfacial bond strength between Al6061 and oxidized SiC<SUB>p</SUB> due to the formation of an MgAl<SUB>2</SUB>O<SUB>4</SUB> continuous phase and suppression of brittle Al<SUB>4</SUB>C<SUB>3</SUB> formation at the interfacial layer. Hardness (∼145 HV), ultimate tensile strength (∼226 MPa), and elongation (10.8%) were enhanced by 75%, 26%, and 32%, respectively, for the composite containing 1400°C-oxidized SiC<SUB>p</SUB>, compared with those reinforced with as-received SiC<SUB>p</SUB>. The friction coefficient and specific wear rate of oxidized-SiC<SUB>p</SUB>/Al6061 composites were reduced by 7% and 17%, respectively; this is attributable to the improved hardness and strength of the composite and the transition of wear mechanisms from a combination of adhesive and fatigue wear to abrasive wear. Quantitative correlations among yield strength, ultimate tensile strength, and interfacial bond strength in SiC<SUB>p</SUB>/Al6061 composites were analyzed for the first time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Oxidized-SiC<SUB>p</SUB>/Al6061 composites were prepared by spark plasma sintering. </LI> <LI> Interfacial layer between oxidized-SiC<SUB>p</SUB> and Al6061 matrix was investigated. </LI> <LI> The interfacial bond strength between oxidized SiC<SUB>p</SUB> and Al6061 matrix was estimated. </LI> <LI> Mechanical properties and wear resistance of the composites were improved. </LI> <LI> New quantitative correlations among the strengths of the composites was analyzed. </LI> </UL> </P>
Van-Trinh Luu,문혜연,황지연,강보규,강현아 한국미생물학회 2017 The journal of microbiology Vol.55 No.8
Nervous necrosis virus (NNV) causes viral encephalopathy and retinopathy, a devastating disease of many species of cultured marine fish worldwide. In this study, we used the dimorphic non-pathogenic yeast Yarrowia lipolytica as a host to express the capsid protein of red-spotted grouper nervous necrosis virus (RGNNV-CP) and evaluated its potential as a platform for vaccine production. An initial attempt was made to express the codon-optimized synthetic genes encoding intact and N-terminal truncated forms of RGNNV-CP under the strong constitutive TEF1 promoter using autonomously replicating sequence (ARS)-based vectors. The full-length recombinant capsid proteins expressed in Y. lipolytica were detected not only as monomers and but also as trimers, which is a basic unit for formation of NNV virus-like particles (VLPs). Oral immunization of mice with whole recombinant Y. lipolytica harboring the ARSbased plasmids was shown to efficiently induce the formation of IgG against RGNNV-CP. To increase the number of integrated copies of the RGNNV-CP expression cassette, a set of 26S ribosomal DNA-based multiple integrative vectors was constructed in combination with a series of defective Ylura3 with truncated promoters as selection markers, resulting in integrants harboring up to eight copies of the RGNNVCP cassette. Sucrose gradient centrifugation and transmission electron microscopy of this high-copy integrant were carried out to confirm the expression of RGNNV-CPs as VLPs. This is the first report on efficient expression of viral capsid proteins as VLPs in Y. lipolytica, demonstrating high potential for the Y. lipolytica expression system as a platform for recombinant vaccine production based on VLPs.