Influence of a soft FGM interlayer on contact stresses under a beam on an elastic foundation

Sergey M. Aizikovich,Boris I. Mitrin,Nikolai M. Seleznev,Yun-Che Wang,Sergey S. Volkov 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.58 No.4

Contact interaction of a beam (flexible element) with an elastic half-plane is considered, when a soft inhomogeneous (functionally graded) interlayer is present between them. The beam is bent under the action of a distributed load applied to the surface and a reaction of the elastic interlayer and the half-space. Solution of the contact problem is obtained for different values of thickness and parameters of inhomogeneity of the layer. The interlayer is assumed to be significantly softer than the underlying halfplane; case of 100 times difference in Young’s moduli is considered as an example. The influence of the interlayer thickness and gradient of elastic properties on the distribution of the contact stresses under the beam is studied.

Axisymmetric bending of a circular plate with stiff edge on a soft FGM layer

Sergey S. Volkov,Alexander N. Litvinenko,Sergey M. Aizikovich,Yun-Che Wang,Andrey S. Vasiliev 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.2

A circular plate with constant thickness, finite radius and stiff edge lying on an elastic halfspace is considered. The half-space consists of a soft functionally graded (FGM) layer with arbitrary varying elastic properties and a homogeneous elastic substrate. The plate bends under the action of arbitrary axisymmetric distributed load and response from the elastic half-space. A semi-analytical solution for the problem effective in whole range of geometric (relative layer thickness) and mechanical (elastic properties of coating and substrate, stiffness of the plate) properties is constructed using the bilateral asymptotic method (Aizikovich et al. 2009). Approximated analytical expressions for the contact stresses and deflections of the plate are provided. Numerical results showing the qualitative dependence of the solution from the initial parameters of the problem are obtained with high precision.

A Framework for Real Time Vehicle Pose Estimation based on synthetic method of obtaining 2D-to-3D Point Correspondence

( Sergey Yun ),( Moongu Jeon ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1

In this work we present a robust and fast approach to estimate 3D vehicle pose that can provide results under a specific traffic surveillance conditions. Such limitations are expressed by single fixed CCTV camera that is located relatively high above the ground, its pitch axes is parallel to the reference plane and the camera focus assumed to be known. The benefit of our framework that it does not require prior training, camera calibration and does not heavily rely on 3D model shape as most common technics do. Also it deals with a bad shape condition of the objects as we focused on low resolution surveillance scenes. Pose estimation task is presented as PnP problem to solve it we use well known “POSIT” algorithm [1]. In order to use this algorithm at least 4 non coplanar point’s correspondence is required. To find such we propose a set of techniques based on model and scene geometry. Our framework can be applied in real time video sequence. Results for estimated vehicle pose are shown in real image scene.

PLL을 이용한 압전 초음파 모터의 구동회로에 관한 연구

金南賢(Nam-Hyun Kim),Sergey Borodin,姜種鈗(Chong-Yun Kang),安秉局(Byung-Guk Ahn),高太國(TaeKuk Ko),金賢在(Hyun-Jai Kim),尹錫珍(Seok-Jin Yoon) 대한전기학회 2003 전기학회논문지 B Vol.52 No.1

Allelic Variation in <i>CXCL16</i> Determines CD3 ⁺ T Lymphocyte Susceptibility to Equine Arteritis Virus Infection and Establishment of Long-Term Carrier State in the Stallion

Sarkar, Sanjay,Bailey, Ernest,Go, Yun Young,Cook, R. Frank,Kalbfleisch, Ted,Eberth, John,Chelvarajan, R. Lakshman,Shuck, Kathleen M.,Artiushin, Sergey,Timoney, Peter J.,Balasuriya, Udeni B. R. Public Library of Science 2016 PLoS genetics Vol.12 No.12

<▼1><P>Equine arteritis virus (EAV) is the causative agent of equine viral arteritis (EVA), a respiratory, systemic, and reproductive disease of horses and other equid species. Following natural infection, 10–70% of the infected stallions can become persistently infected and continue to shed EAV in their semen for periods ranging from several months to life. Recently, we reported that some stallions possess a subpopulation(s) of CD3<SUP>+</SUP> T lymphocytes that are susceptible to <I>in vitro</I> EAV infection and that this phenotypic trait is associated with long-term carrier status following exposure to the virus. In contrast, stallions not possessing the CD3<SUP>+</SUP> T lymphocyte susceptible phenotype are at less risk of becoming long-term virus carriers. A genome wide association study (GWAS) using the Illumina Equine SNP50 chip revealed that the ability of EAV to infect CD3<SUP>+</SUP> T lymphocytes and establish long-term carrier status in stallions correlated with a region within equine chromosome 11. Here we identified the gene and mutations responsible for these phenotypes. Specifically, the work implicated three allelic variants of the equine orthologue of <I>CXCL16</I> (<I>EqCXCL16</I>) that differ by four non-synonymous nucleotide substitutions (XM_00154756; c.715 A → T, c.801 G → C, c.804 T → A/G, c.810 G → A) within exon 1. This resulted in four amino acid changes with EqCXCL16S (XP_001504806.1) having Phe, His, Ile and Lys as compared to EqCXL16R having Tyr, Asp, Phe, and Glu at 40, 49, 50, and 52, respectively. Two alleles (<I>EqCXCL16Sa</I>, <I>EqCXCL16Sb</I>) encoded identical protein products that correlated strongly with long-term EAV persistence in stallions (P<0.000001) and are required for <I>in vitro</I> CD3<SUP>+</SUP> T lymphocyte susceptibility to EAV infection. The third (<I>EqCXCL16R</I>) was associated with <I>in vitro</I> CD3<SUP>+</SUP> T lymphocyte resistance to EAV infection and a significantly lower probability for establishment of the long-term carrier state (viral persistence) in the male reproductive tract. <I>EqCXCL16Sa</I> and <I>EqCXCL16Sb</I> exert a dominant mode of inheritance. Most importantly, the protein isoform EqCXCL16S but not EqCXCL16R can function as an EAV cellular receptor. Although both molecules have equal chemoattractant potential, EqCXCL16S has significantly higher scavenger receptor and adhesion properties compared to EqCXCL16R.</P></▼1><▼2><P><B>Author Summary</B></P><P>A variable proportion of EAV infected stallions (10–70%) may become persistently infected and continuously shed the virus exclusively in their semen after recovery from acute infection. Previous studies in our laboratory have shown that stallions with the CD3<SUP>+</SUP> T lymphocyte susceptibility phenotype to <I>in vitro</I> EAV infection are at higher risk of becoming persistently infected carriers compared to those that lack this phenotype. Here genetic and experimental studies were used to demonstrate that <I>CXCL16</I> in the horse codes for two proteins, one associated with resistance and the other associated with susceptibility of CD3<SUP>+</SUP> T lymphocytes to EAV infection. The two proteins are the result of four nucleotide substitutions in exon 1 of the equine <I>CXCL16</I> gene. These alleles determine the outcome of <I>in vitro</I> infection of CD3<SUP>+</SUP> T lymphocytes with EAV and are strongly associated with the establishment and maintenance of long-term carrier state in stallions. <I>In vitro</I> studies demonstrated that one form of CXCL16 protein (CXCL16S) is one of the cellular receptors for EAV and has higher scavenger activity and adhesion ability as compared to the form of the protein associated with resistance (CXCL16R).</P></▼2>

Residual stress in an elastoplastic annular disc interacting with an elastic inclusion

Zarandi, Somayeh Bagherinejad,Lai, Hsiang-Wei,Wang, Yun-Che,Aizikovich, Sergey M. Techno-Press 2019 Coupled systems mechanics Vol.8 No.3

Elastoplastic analysis of an annular disc, being fully constrained on its outer rim and interacting with a purely elastic inclusion perfectly bonded with its inner rim, is conducted to study its plastic deformation and residual stress under thermal cycles. The system is termed the composite disc. Quasi-static plane-strain deformation is assumed, and the von Mises yield criterion with or without the Ludwik hardening rule is adopted in our finite element calculations. Effects of multiple material properties simultaneously being temperature dependent on the plastic behavior of the composite disc are considered. Residual stress is analyzed from a complete loading and unloading cycle. Results are discussed for various inclusion radii. It is found that when temperature dependent material properties are considered, the maximum residual stress may be greater than the maximum stress inside the disc at the temperature-loaded state due to lower temperature having larger yield stress. Temperature independent material properties overestimate stresses inside materials, as well as the elastic irreversible temperature and plastic collapse temperature.

Spectral and magnetic properties of Na₂RuO₃

Gapontsev, Vladimir V,Kurmaev, Ernst Z,Sathish, Clastin I,Yun, Seokhwan,Park, Je-Geun,Streltsov, Sergey V IOP 2017 Journal of physics, an Institute of Physics journa Vol.29 No.40

<P>We present measurements of resistivity, x-ray absorption (XAS) and emission (XES) spectroscopy together with <I>ab initio</I> band structure calculations for quasi two dimensional ruthenate Na<SUB>2</SUB>RuO<SUB>3</SUB>. Density function calculations (DFT) and XAS and XES spectra both show that Na<SUB>2</SUB>RuO<SUB>3</SUB> is a semiconductor with an activation energy of  ∼80 meV. Our DFT calculations reveal large magneto-elastic coupling in Na<SUB>2</SUB>RuO<SUB>3</SUB> and predict that the ground state of Na<SUB>2</SUB>RuO<SUB>3</SUB> should be antiferromagnetic zig–zag.</P>