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Numerical analysis of three-dimensional thermo-elastic rolling contact under steady-state conditions

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Friction 2022年第4期10卷 630-644页

作者： Yonghun YU Junho suh Department of Mechanical Engineering Pusan National UniversityBusan SW72AZRepublic of Korea

In this study,a three-dimensional thermo-elastic model that considers the interaction of mechanical and thermal deformation is developed using a semi-analytic method for steady-state rolling *** types in all directions are considered in this *** verification,the numerical analysis results of shear traction and temperature increase are compared separately with existing numerical results,and the consistency is *** analysis results include heat flux,temperature increase,contact pressure,and shear *** severe rolling conditions,the thermal effect changes the behavior of the contact interface ***,the effects of creepage,rolling speed,and conformity under different rolling and creep conditions are investigated.

关键词： creep frictional heat rolling contact spin thermal deformation

Pseudo-anti commuting Ricci tensor for real hypersurfaces in the complex hyperbolic quadric

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Science China Mathematics 2019年第4期62卷 679-698页

作者： Young Jin suh Department of Mathematics & Research Institute of Real and Complex Manifolds College of Natural SciencesKyungpook National University

We introduce a new notion of pseudo-anti commuting Ricci tensor for real hypersurfaces in the noncompact complex hyperbolic quadric Q^(m?)= SO_2~0,_m/SO_2SO_m and give a complete classi?cation of these hypersurfaces.

关键词： pseudo-anti commuting Ricci tensor pseudo-Einstein A-isotropic A-principal complex conjugation complex hyperbolic quadric

Equivariant Cobordism of Torus Orbifolds

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Chinese Annals of Mathematics,Series B 2021年第6期42卷 861-890页

作者： Soumen SARKAR DongYoup suh Department of Mathematics Indian Institute of Technology MadrasChennai 600036India Department of Mathematical Sciences KAISTDaejeon 305701Republic of Korea

Torus orbifolds are topological generalizations of symplectic toric *** authours give a construction of smooth orbifolds with torus actions whose boundary is a disjoint union of torus orbifolds using a toric topological *** a result,they show that any orientable locally standard torus orbifold is equivariantly cobordant to some copies of orbifold complex projective *** also discuss some further equivariant cobordism results including the cases when torus orbifolds are actually torus manifolds.

关键词： Manifold with corners Torus action Torus orbifolds Equivariant cobordism

Real hypersurfaces in the complex quadric with commuting Ricci tensor

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Science China Mathematics 2016年第11期59卷 2185-2198页

作者： suh YoungJin HWANG DooHyun Department of Mathematics Kyungpook National University

We introduce the notion of commuting Ricci tensor for real hypersurfaces in the complex quadric Qm = SOm＋2/SOmSO2. It is shown that the commuting Ricci tensor gives that the unit normal vector field N becomes -principal or -isotropic. Then according to each case, we give a complete classification of Hopf real hypersurfaces in Qm = SOm＋2/SOmSO2 with commuting Ricci tensor.

关键词： commuting Ricci tensor -isotropic -principal Kahler structure complex conjugation complex quadric

Quantitative analysis of mechanical properties associated with aging treatment and microstructure in Mg-Al-Zn alloys through machine learning

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Journal of Materials Science & Technology 2022年第12期107卷 52-63页

作者： Joung Sik suh Byeong-Chan suh Sang Eun Lee Jun Ho Bae Byoung Gi Moon Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

The present study proposes a methodology for predicting the mechanical properties of AZ61 and AZ91alloys associated with microstructure,texture and aging parameters and estimating predictor *** this,we investigate quantitative correlations between microstructure,texture and mechanical properties of aged AZ61 and AZ91 rods through machine *** regression analysis focuses on the precipitation behavior of Mg17Al12as the main second phase of Mg-Al-Zn alloys with respect to aging *** simplify data generation,only SEM images were used to quantify the features of discontinuous and continuous *** overcome the lack of data and make the most of the measured data,we devised a method to extend the existing dataset by a factor of 9 using the mean and standard deviation of the measured *** neural networks predicted tensile and compressive yield strengths and resultant yield asymmetry with a high accuracy of over 98%using 11 predictors for a total of *** tree learning quantitatively assessed the importance of predictors in determining the mechanical properties of aged AZ61 and AZ91 rods.

关键词： Magnesium alloy Aging treatment Microstructure Mechanical properties Machine learning

Circulating miRNAs in Ageing and Ageing-Related Diseases

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Journal of Genetics and Genomics 2014年第9期41卷 465-472页

作者： Hwa Jin Jung Yousin suh Department of Genetics and Medicine Albert Einstein College of MedicineBronxNY 11363USA Ageing Research Institute Guangdong Medical College

MicroRNAs （miRNAs） are small non-coding RNAs that negatively regulate gene expression at the post-transcriptional level. They are involved in important biological processes including development, homeostasis, and ageing. Recently, extracellular miRNAs have been discovered in the bloodstream and bodily fluids. These miRNAs are shown to be secreted and circulating in microvesicles （MVs）, or in complex with other factors such as RNA-binding proteins and high-density lipoprotein （HDL） particles. These cell-free, circulating miRNAs can be taken into and function as negative regulators of target genes in recipient cells. Here we review the biogenesis and uptake of circulating miRNAs as well as their profiles in ageing and ageing-related diseases. We discuss the emerging role of circulating miRNAs as biomarkers and therapeutic targets.

关键词： Circulating miRNAs Ageing Ageing-related disease Biomarkers

Calculation of the Transition Temperature for Partitioned Growth of Proeutectoid Ferrite in Fe-C Base Multicomponent Alloys

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Journal of Iron and Steel Research International 2011年第S1期18卷 530-534页

作者： suh Dong-woo Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang 790-784Republic of Korea

According to the local equilibrium theory,the ferrite growth from alloyed austenite could be divided into the partition local equilibrium (PLE) mode and negligible partition local equilibrium (NPLE) mode.A graphical construction method proposed earlier by Hillert using in Fe-C-X ternary alloys was extended into Fe-C base multicomponent alloys to calculate the PLE/NPLE transition *** method utilize the carbon component ray,in which the substitutional alloy elements content is constant,to determine PLE/NPLE transition *** the method,the PLE/NPLE transition temperature in several alloy systems are calculated and compared with the formerly reported results.

关键词： phase transformation local equilibrium kinetics ferrite PLE/NPLE transition

The association of salivary alpha-amylase, heart rate variability, and psychological stress on objectively measured sleep behaviors among college students

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Frontiers of Nursing 2022年第1期9卷 63-70页

作者： Minhee suh Department of Nursing Inha UniversityMichuhol-GuIncheon 22212Republic of Korea

Objective:This study aimed to evaluate sleep behaviors among college students,to assess salivary alpha-amylase(sAA)and heart rate variability(HRV)in association with stress,and to investigate sleep-related factors including sAA,HRV,and stress among ***:Saliva samples for sAA assessment and HRV measurements in the supine position were taken between 3 PM and 6 *** level of prolonged psychological stress for the previous week was evaluated using the Korean version of the Global Assessment of Recent Stress(GARS-K),and sleep behaviors were assessed using an actigraphy ***:A total of 86 healthy college students participated in this *** behaviors of the college students were not good,with 84%sleep efficiency(SE)and 62.7 min wake after sleep onset(WASO).The average sAA level was 65.8 U/mL in the *** neither the sAA level nor HRV indices were significantly correlated with prolonged psychological stress,decreased normalized high frequency(nHF)on HRV was independently associated with a higher level of stress when adjusted for age and *** stress(r=-0.276,P=0.011)and lower sAA(r=0.266,P=0.030)had significant correlations with shorter time in bed;however,it was sAA that was independently associated with time in bed(β=0.244,p=0.044).Decreased nHF(β=0.245,P=0.027)and higher body mass index(BMI)(β=-0.224,P=0.043)were independently related to and poorer ***:Poor sleep behaviors were associated with decreased parasympathetic activity,a physiological change to psychological stress,rather than with psychological stress itself among college ***,sAA and HRV should be considered as significant factors for impaired sleep behaviors in relation to psychological stress.

关键词： alpha-amylase psychological stress Autonomic nervous system heart rate variability sleep

A 360-Degree Panoramic Image Inpainting Network Using a Cube Map

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Computers, Materials & Continua 2021年第1期66卷 213-228页

作者： Seo Woo Han Doug Young suh Department of Electronic Engineering Kyung Hee UniversityYoungin17104South Korea

Inpainting has been continuously studied in the field of computer *** artificial intelligence technology developed,deep learning technology was introduced in inpainting research,helping to improve ***,the input target of an inpainting algorithm using deep learning has been studied from a single image to a ***,deep learning-based inpainting technology for panoramic images has not been actively *** propose a 360-degree panoramic image inpainting method using generative adversarial networks(GANs).The proposed network inputs a 360-degree equirectangular format panoramic image converts it into a cube map format,which has relatively little distortion and uses it as a training *** the cube map format is used,the correlation of the six sides of the cube map should be ***,all faces of the cube map are used as input for the whole discriminative network,and each face of the cube map is used as input for the slice discriminative network to determine the authenticity of the generated *** proposed network performed qualitatively better than existing single-image inpainting algorithms and baseline algorithms.

关键词： Panoramic image image inpainting cube map generative adversarial networks