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Local MFS Matrix Decomposition Algorithms for Elliptic BVPs in Annuli

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Numerical Mathematics(Theory,Methods and Applications) 2024年第1期17卷 93-120页

作者： c.S.c.en Andreas Karageorghis Min lei School of Mathematics and Natural Sc.ences University of Southern MississippiHattiesburgMS 39406USA Department of Mathematics and Statistics University of CyprusP.O.Box 20537Nicosia 1678Cyprus college of Mathematics Taiyuan University of TechnologyTaiyuan 030024P.R.China

We apply the local method of fundamental solutions(LMFS)to boundary value problems(BVPs)for the Laplace and homogeneous biharmonic equations in *** appropriately choosing the collocation points,the LMFS discretization yields sparse block circulant system *** a result,matrix decomposition algorithms(MDAs)and fast Fourier transforms(FFTs)can be used for the solution of the systems resulting in considerable savings in both computational time and storage *** accuracy of the method and its ability to solve large scale problems are demonstrated by applying it to several numerical experiments.

关键词： Local method of fundamental solutions Poisson equation biharmonic equation matrix decomposition algorithms fast Fourier transforms

Downregulation of Serum PTen Expression in Mercury-Exposed Population and PI3K/AKT Pathway-Induced Inflammation

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Biomedical and environmental Sc.ences 2024年第4期37卷 354-366页

作者： MEI Peng DING en Min YIN Hao Yang DING Xue Xue WANG Huan WANG Jian Feng HAN lei ZHANG Heng Dong ZHU Bao Li School of Public Health Nanjing Medical UniversityNanjing 210000JiangsuChina Institute of Occupational Disease Prevention Jiangsu Province Center for Disease Prevention and ControlNanjing 21000JiangsuChina Suzhou center for Disease Prevention and control Suzhou 215004JiangsuChina center for Global Health School of Public HealthNanjing Medical UniversityNanjing 210000JiangsuChina

Objective This study investigated the impact of occupational mercury(Hg) exposure on human gene transcription and expression, and its potential biological *** Differentially expressed genes related to Hg exposure were identified and validated using gene expression microarray analysis and extended validation. Hg-exposed cell models and PTen lowexpression models were established in vitro using 293T cells. PTen gene expression was assessed using qRT-PcR, and Western blotting was used to measure PTen, AKT, and PI3K protein levels. IL-6 expression was determined by *** combined findings from gene expression microarray analysis, bioinformatics, and population expansion validation indicated significant downregulation of the PTen gene in the high-concentration Hg exposure group. In the Hg-exposed cell model(25 and 10 μmol/L), a significant decrease in PTen expression was observed, accompanied by a significant increase in PI3K, AKT, and IL-6 ***, a low-expression cell model demonstrated that PTen gene knockdown led to a significant decrease in PTen protein expression and a substantial increase in PI3K, AKT, and IL-6 *** This is the first study to report that Hg exposure downregulates the PTen gene, activates the PI3K/AKT regulatory pathway, and increases the expression of inflammatory factors, ultimately resulting in kidney inflammation.

关键词： PTen Occupational mercury exposure Occupational health PI3K/AKT pathway 293T cell IL-6

Prescribed-Time Nash Equilibrium Seeking for Pursuit-Evasion Game

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IEEE/cAA Journal of Automatica Sinica 2024年第6期11卷 1518-1520页

作者： lei Xue Jianfeng Ye Yongbao Wu Jian Liu D.c.Wunsch Key Laboratory of Measurement and control of complex Systems of engineering Ministry of EducationNanjing 210096 School of Automation Southeast UniversityNanjing 210096China Department of Electrical and computer engineering Missouri University of Science and TechnologyRollaMO 65409 USA IEEE

Dear Editor,This letter is concerned with prescribed-time Nash equilibrium(PTNE)seeking problem in a pursuit-evasion game(PEG)involving agents with second-order *** order to achieve the prior-given and user-defined convergence time for the PEG,a PTNE seeking algorithm has been developed to facilitate collaboration among multiple pursuers for capturing the evader without the need for any global ***,it is theoretically proved that the prescribedtime convergence of the designed algorithm for achieving Nash equilibrium of ***,the effectiveness of the PTNE method was validated by numerical simulation results.A PEG consists of two groups of agents:evaders and *** pursuers aim to capture the evaders through cooperative efforts,while the evaders strive to evade *** is a classic noncooperative *** has attracted plenty of attention due to its wide application scenarios,such as smart grids[1],formation control[2],[3],and spacecraft rendezvous[4].It is noteworthy that most previous research on seeking the Nash equilibrium of the game,where no agent has an incentive to change its actions,has focused on asymptotic and exponential convergence[5]-[7].

关键词： seeking prescribed convergence

Metarelation2vec:A Metapath-Free Scalable Representation Learning Model for Heterogeneous Networks

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Tsinghua Sc.ence and Technology 2024年第2期29卷 553-575页

作者： lei c.en Yuan Li Yong lei Xingye Deng School of Information and Electrical engineering Hunan University of Science and TechnologyXiangtan 411201China School of computer Sc.ence and engineering Hunan University of Science and TechnologyXiangtan 411201China

Metapaths with specific complex semantics are critical to learning diverse semantic and structural information of heterogeneous networks(HNs)for most of the existing representation learning ***,any metapaths consisting of multiple,simple metarelations must be driven by domain *** sensitive,expensive,and limited metapaths severely reduce the flexibility and scalability of the existing models.A metapath-free,scalable representation learning model,called Metarelation2vec,is proposed for HNs with biased joint learning of all metarelations in a bid to address this ***,a metarelation-aware,biased walk strategy is first designed to obtain better training samples by using autogenerating cooperation probabilities for all metarelations rather than using expert-given ***,grouped nodes by the type,a common and shallow skip-gram model is used to separately learn structural proximity for each node ***,grouped links by the type,a novel and shallow model is used to separately learn the semantic proximity for each link ***,supervised by the cooperation probabilities of all meta-words,the biased training samples are thrown into the shallow models to jointly learn the structural and semantic information in the HNs,ensuring the accuracy and scalability of the *** experimental results on three tasks and four open datasets demonstrate the advantages of our proposed model.

关键词： metarelation random walk heterogeneous network metapath representation learning

Two-Stage Online Debiased Lasso Estimation and Inference for High-Dimensional Quantile Regression with Streaming Data

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Journal of Systems Sc.ence & complexity 2024年第3期37卷 1251-1270页

作者： PenG Yanjin WANG lei School of Statistics and Data Sc.ence KLMDASRLEBPS and LPMCNankai UniversityTianjin 300071China

In this paper,the authors propose a two-stage online debiased lasso estimation and statistical inference method for high-dimensional quantile regression(QR)models in the presence of streaming *** the first stage,the authors modify the QR score function based on kernel smoothing and obtain the online lasso smoothed QR estimator through iterative *** estimation process only involves the current data batch and specific historical summary statistics,which perfectly accommodates to the special structure of streaming *** the second stage,an online debiasing procedure is carried out to eliminate biases caused by the lasso penalty as well as the accumulative approximation error so that the asymptotic normality of the resulting estimator can be *** authors conduct extensive numerical experiments to evaluate the performance of the proposed *** experiments demonstrate the effectiveness of the proposed method and support the theoretical *** application to the Beijing PM2.5 Dataset is also presented.

关键词： Adaptive tuning asymptotic normality debiased lasso online updating quantile regres-sion

Structural energy storage composites based on modified carbon fiber electrode with metal-organic frame enhancing layered double hydroxide

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Nano Research 2024年第3期17卷 1552-1563页

作者： Jinrui Ye Zhongbao Wang Qin lei lei Sun Jinfeng Gu School of Aerospace engineering Beijing Institute of TechnologyBeijing 100081China Tangshan Research Institute Beijing Institute of TechnologyTangshan 063000China School of Materials Sc.ence and engineering Shenyang Jianzhu UniversityShenyang 110168China Department of Stomatology PLA Strategic Support Force Characteristic Medical CenterBeijing 100101China Beijing Electromechanical engineering Research Institute Beijing 100074China

Structural energy storage composites present advantages in simultaneously achieving structural strength and electrochemical *** of carbon fiber electrodes and resin structural electrolytes in energy storage composite poses challenges in maintaining good mechanical and electrochemical properties at reasonable cost and ***,we report a simple method to fabricate structural supercapacitor using carbon fiber electrodes(modified by Ni-layered double hydroxide(Ni-LDH)and in-situ growth of co-metal-organic framework(co-MOF)in a two-step process denoted as co-MOF/Ni-LDH@cF)and bicontinuous-phase epoxy resin-based structural ***-MOF/Ni-LDH@cF as electrode material exhibits improved specific capacity(42.45 F·g^(-1))and cycle performance(93.3%capacity retention after 1000 cycles)in a three-electrode *** bicontinuous-phase epoxy resin-based structural electrolyte exhibits an ionic conductivity of 3.27×10^(-4) S·cm^(-1).The fabricated co-MOF/Ni-LDH@cF/SPE-50 structural supercapacitor has an energy density of 3.21 Wh·kg^(-1) at a power density of 42.25 W·kg^(-1),whilst maintaining tensile strength and modulus of 334.6 MPa and 25.2 *** results show practical potential of employing modified commercial carbon fiber electrodes and epoxy resin-based structural electrolytes in structural energy storage applications.

关键词： carbon fiber electrode structural electrolyte structural energy storage composites supercapacitor

Terminal-selective c（sp3）–H borylation of unbranched alkanes enabled by intermolecular radical sampling and LMcT photocatalysis

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National Sc.ence Review 2024年第5期11卷 96-98页

作者： Zhexuan lei Jie Wu Department of chemistry National University of Singapore

The selective functionalization of c（sp3）–H bonds with subtle differences in alkanes is highly sought after due to its atom-and step-effic.ency. The activation of c（sp3）–H bonds through hydrogen atom transfer （HAT） has been extensively exploited to produce a valueadded product from unfunctionalized material [1,2].

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Impact of cOVID-19 pandemic on cardiovascular health in sedentary and athletes:consensus,uncertainties,and ways for mitigation

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Sports Medicine and Health Sc.ence 2024年第3期6卷 205-208页

作者： John c.Quindry lei Xi School of Integrative Physiology and Athletic Training University of MontanaMissoulaMT59812USA Pauley Heart center Department of Internal MedicineSchool of MedicineVirginia Commonwealth UniversityRichmondVA23298-0204USA

More than 4 years has elapsed since the World Health Organization(WHO)ofﬁcially announced the coronavirus disease 2019(cOVID-19)as a pandemic outbreak in March 11,*** the ongoing investigations and political debates upon the origin,exacerbation,resurgence,andﬁnal control of cOVID-19,medical and sc.entiﬁc consensus indicates that the now endemic cOVID-19 virus is one of the worst public health crises in our *** every person on earth has been directly or indirectly impacted by the adverse effects of the highly contagious viral pathogen-SARS-coV-2(severe acute respiratory syndrome coronavirus 2).Indeed,the population reach of the cOVID-19 infection includes governmental response measures(e.g.,lockdowns and social distancing,mandates for masks and face coverings,vaccines,etc.)that have restricted entrenched societal routines,personal mobility,and ***,the host of health problems linked to this viral infection linger to this day,with selective groups of people experiencing a higher risk for untoward medical outcomes and/or elevated levels of vulnerability to the post-acute sequelae of cOVID-19(***-cOVID).For example,a 2021 study by Logue et *** initial evidence that 10%–30%of individuals in United States may experience prolonged symptoms following SARS-coV-2 infection,including cardiovascular abnormalities.1 Similarly,a 2021 retrospective cohort study in england suggest that the incidence of major adverse cardiovascular events(*** failure,myocardial infarction,ischemic stroke.

关键词： cardiovascular routine Impact

DcVAE-adv:A Universal Adversarial Example Generation Method for White and Black Box Attacks

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Tsinghua Sc.ence and Technology 2024年第2期29卷 430-446页

作者： lei Xu Junhai Zhai college of Mathematics and Information Sc.ence Hebei UniversityBaoding 071002China

Deep neural network(DNN)has strong representation learning ability,but it is vulnerable and easy to be fooled by adversarial *** order to handle the vulnerability of DNN,many methods have been *** general idea of existing methods is to reduce the chance of DNN models being fooled by observing some designed adversarial examples,which are generated by adding perturbations to the original *** this paper,we propose a novel adversarial example generation method,called *** from the existing methods,DcVAE-adv constructs adversarial examples by mixing both explicit and implicit perturbations without using original ***,the proposed method can be applied to both white box and black box *** addition,in the inference stage,the adversarial examples can be generated without loading the original images into memory,which greatly reduces the memory *** compared DcVAE-adv with three most advanced adversarial attack algorithms:FGSM,AdvGAN,and AdvGAN++.The experimental results demonstrate that DcVAE-adv is superior to these state-of-the-art methods in terms of attack success rate and transfer ability for targeted *** code is available at https://***/xzforeverlove/DcVAE-adv.

关键词： deep neural network adversarial examples white box attack black box attack robustness