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Partially positive matrices

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Science China Mathematics 2015年第10期58卷 2245-2254页

作者： ZHOU AnWa fan jinyan Department of Mathematics and MOE-LSC Shanghai Jiao Tong University

A real n × n symmetric matrix P is partially positive(PP) for a given index set I ? {1,..., n} if there exists a matrix V such that V(I, :) 0 and P = V VT. We give a characterization of PP-matrices. A semidefinite algorithm is presented for checking whether a matrix is partially positive or not. Its properties are studied. A PP-decomposition of a matrix can also be obtained if it is partially positive.

关键词： partially positive matrices completely positive matrices A-truncated K-moment problem semidefinite algorithm

Completely positive tensors in the complex field

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Science China Mathematics 2020年第6期63卷 1219-1234页

作者： Anwa Zhou jinyan fan Qingwen Wang Department of Mathematics Shanghai UniversityShanghai 200444China School of Mathematical Sciences and MOE-LSC Shanghai Jiao Tong UniversityShanghai 200240China

In this paper, we introduce the complex completely positive tensor, which has a symmetric complex decomposition with all real and imaginary parts of the decomposition vectors being non-negative. Some properties of the complex completely positive tensor are given. A semidefinite algorithm is also proposed for checking whether a complex tensor is complex completely positive or not. If a tensor is not complex completely positive, a certificate for it can be obtained;if it is complex completely positive, a complex completely positive decomposition can be obtained.

关键词： complex completely positive tensor complex completely positive decomposition truncated moment problem semidefinite program

A RETROSPECTIVE TRUST REGION ALGORITHM WITH TRUST REGION CONVERGING TO ZERO

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Journal of Computational Mathematics 2016年第4期34卷 421-436页

作者： jinyan fan Jianyu Pan Hongyan Song School of Mathematical Sciences and MOE-LSC Shanghai Jiao Tong University Shanghai 200240 China Department of Mathematics Shanghai Key Laboratory of PMMP East China Normal University Shanghai 200241 China School of Mathematical Sciences Shanghai Jiao Tong University Shanghai 200240 China

We propose a retrospective trust region algorithm with the trust region converging to zero for the unconstrained optimization problem. Unlike traditional trust region algo- rithms, the algorithm updates the trust region radius according to the retrospective ratio, which uses the most recent model information. We show that the algorithm preserves the global convergence of traditional trust region algorithms. The superlinear convergence is also proved under some suitable conditions.

关键词： Retrospective trust region algorithm Unconstrained optimization Superlinearconvergence.

Testing the Efficacy,Psychology,and Effectiveness of a Realistic Orientation Program for Entry Stress:An Exploratory Longitudinal Field Experiment

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Testing the Efficacy,Psychology,and Effectiveness of a Reali...

A new trust region algorithm for nonlinear equations with trust region converging to zero

第十七届全国心理学学术会议

作者： Xiang Yao jinyan fan Peking University Auburn University

Although most organizations offer some sort of newcomer orientation programs,HR researchers and practitioners have been well aware of its general ineffectiveness in facilitating newcomer *** and colleagues(Wanous,1993;Wanous&Reichers,2000)suggested an innovative approach to newcomer orientation,called"Realistic Orientation Program for Entry Stress"(ROPES).The ROPES approach identifies major entry stressors newcomers will likely encounter after organizational entry,warns them of these stressors,and most importantly,teaches them various coping *** propose an exploratory longitudinal field experiment to further test the utility of ROPES as an effective orientation tool,addressing several limitations that have plagued previous ROPES *** hired nurses(n=81)entering a public hospital located in Beijingenrolled in this *** new nurses will be randomly assigned into either a control condition(n=40)or a ROPES condition(n=41)during the orientation *** will be assessed before and immediately after the intervention,as well as at 3 and 9 months *** results showed that new nurses in the ROPES condition reported higher perceived utility of the orientation program,exhibited more proactive behaviors,felt less stress,were better socialized on several socialization content dimensions,and had higher supervisor-rated in-role *** our best knowledge,this was the first study that shows that organizations may boost newcomer proactive behaviors through *** study also further confirmed stress reduction as a major mechanisms of *** showing ROPES effects on proximal socialization outcomes(proactive behaviors and socialization content),this study addressed the repeated call for the integration of the two newcomer orientation literature and the newcomer socialization literature.

关键词： ROPES new-comer socialization stress proactive behaviors in-role performance

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A new trust region algorithm for nonlinear equations with tr...

中国运筹学会第七届学术交流会

作者： jinyan fan Department of Mathematics, Shanghai Jiao Tong University Shanghai 200240, China

n this paper, we present a new trust region algorithm for nonlinear equa-tions with the trust region radius converging to zero. The new algorithm preservesthe global convergence of the traditional trust region algorithms in which the trustregion radius will be larger than a positive constant. The convergence rate of the newalgorithm is also studied under the local error bound condition which is weaker thanthe nonsingularity.

关键词： Nonlinear equations trust region method local error bound condition

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社会自我效能感的结构、测量及其作用机制

心理科学进展 2014年第11期22卷 1791-1800页

作者：顾佳旎孟慧范津砚华东师范大学心理与认知科学学院上海200062 Department of Psychology Auburn University

班杜拉的自我效能理论一直是当代心理学的热点话题。作为社交情境中的特殊自我效能感,社会自我效能感是能够影响个人人际互动质量的重要心理因素之一,因此也逐渐开始受到研究者的关注。通过对国内外理论文章与实证研究的分析发现,社会... 详细信息

班杜拉的自我效能理论一直是当代心理学的热点话题。作为社交情境中的特殊自我效能感,社会自我效能感是能够影响个人人际互动质量的重要心理因素之一,因此也逐渐开始受到研究者的关注。通过对国内外理论文章与实证研究的分析发现,社会自我效能感与社交自尊、社交果敢性、社交信心等相关概念有所不同,是指个体对自己社交能力的主观信念;其内涵在不同文化自我或情境的视角下可能存在差异,具有多元结构的可能性。社会自我效能感与个人特质、情绪、态度及行为等变量相关,并能够显著预测抑郁、社交焦虑、生活满意度、社会适应等变量。此外,社会自我效能感也在外向、性别角色、依恋、目标定向、网络人际交往的影响机制中起到中介作用,且能够对压力和不公平感所造成的消极影响具有一定的缓冲作用。然而有关研究仍存在诸多问题与不足,未来研究应该关注社会自我效能感内涵与结构的确定、测量工具的开发,并加强对其影响因素与影响效应的探索、系统模型的构建和跨文化研究的扩展。

关键词：社会自我效能感自我效能感生活满意度社会适应主观幸福感

Insights into varicella-zoster virus assembly from the B-and C-capsid at near-atomic resolution structures

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hLife 2024年第2期2卷 64-74页

作者： Lei Cao Nan Wang Zhe Lv Wenyuan Chen Zhonghao Chen Lifei Song Xueyan Sha Guiqiang Wang Yaling Hu Xiaojun Lian Guoliang Cui jinyan fan Yaru Quan Hongrong Liu Hai Hou Xiangxi Wang CAS Key Laboratory of Infection and Immunity National Laboratory of MacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijingChina Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-dimensional Quantum Structures and Quantum ControlSchool of Physics and ElectronicsHunan Normal UniversityHunanChina Institute of Medical Research Northwestern Polytechnical UniversityShanxiChina Sinovac(Dalian)Vaccine Technology Co. Ltd.LiaoningChina Sinovac Biotech Ltd. BeijingChina National Institutes for Food and Drug Control BeijingChina

Varicella-zoster is a highly communicable virus that can be transmitted through the airborne *** one quarter of people are infected with this *** studies have described the structure of A-capsid and a blurred reconstruction of the C-capsid with icosahedral *** this study,we have determined the more precise detailed structures of the varicella-zoster virus(VZV)B-and C-capsid in icosahedral symmetry using a combination of block-based reconstruction and symmetry relaxation *** addition,we are reporting structural details of the portal vertex reconstructions in five-fold symmetry and portal reconstructions in twelve-fold *** structures unveil the basis for the high thermal stability of the VZV *** conformational flexibility of structural elements of the capsid plays a role in the assembly of the capsid and drives processes critical for the viral life *** results of the study open up new avenues for the development of drugs against a highly prevalent and contagious pathogen.

关键词： varicella-zoster virus capsid structure virus assembly

信赖域方法在Hölderian局部误差界下的收敛性质

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计算数学 2021年第4期43卷 484-492页

作者：马积瑞范金燕上海交通大学数学科学学院教育部科学工程计算重点实验室上海200240

信赖域方法是求解非线性方程组的一种重要方法.本文研究了求解非线性方程组的信赖域半径趋于零的信赖域算法在Jacobi矩阵Hölderian连续条件下的全局收敛性质,以及其在Hölderian局部误差界和Jacobi矩阵Hölderian连续条件下的收敛速度.

关键词：非线性方程组信赖域方法 Hölderian局部误差界

自适应Levenberg-Marquardt方法提高潮流计算收敛性

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中国电机工程学报 2015年第8期35卷 1909-1918页

作者：严正范翔赵文恺徐潇源范金燕王毅电力传输与功率变换控制教育部重点实验室(上海交通大学) 上海市闵行区200240 上海交通大学数学系上海市闵行区200240 中国电力科学研究院北京市海淀区100192

Levenberg-Marquardt(LM)方法是一种求解病态非线性方程组的数值算法。LM方法的性能取决于阻尼因子的选取及更新策略。提出一种带自适应阻尼因子的LM方法来提高潮流计算的收敛性。针对电力系统良态潮流、病态潮流和潮流无解等3种情况,... 详细信息

Levenberg-Marquardt(LM)方法是一种求解病态非线性方程组的数值算法。LM方法的性能取决于阻尼因子的选取及更新策略。提出一种带自适应阻尼因子的LM方法来提高潮流计算的收敛性。针对电力系统良态潮流、病态潮流和潮流无解等3种情况,详细分析所提方法提高潮流计算收敛性的原因和机理。针对自适应LM迭代步中求逆矩阵的特殊结构,提出一种自适应LM迭代步的稀疏实现方法。对4个实际系统(含国网21 479节点系统)和1个IEEE 300节点标准系统进行仿真计算后结果表明:自适应LM方法能够得到良态或病态潮流的精确解以及潮流无解时的最小二乘解,因此具有很强的适应能力。在病态或无解的情况下,所提方法得到的计算结果可为后续的潮流调整提供有效依据。

关键词：自适应LM方法潮流计算病态潮流自适应阻尼因子稀疏技术