检索结果-南通市图书馆

Science china {1. 2009年第7期52卷 1391-1411页

作者： peng shige institute of mathematics,Shandong {1.,jinan 2.01.0,china 1. institute of {1. Shandong University Jinan 250100 China

This is a survey on normal distributions and the related central limit theorem under sublinear *** also present Brownian motion under sublinear expectations and the related stochastic calculus of It's *** results provide new and robust tools for the problem of probability model uncertainty arising in financial risk,statistics and other industrial problems.

关键词： probability and distribution uncertainty normal distribution Brownian motion central limit theorem 60H1. 60H05 60H30 60E05 60E07 62C05 62D05

Filtration Consistent Nonlinear Expectations and Evaluations of Contingent Claims

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2004年第2期 15-38页

作者： shige {1. institute of mathematics,Shandong university,2.01.0 jinan,china

We will study the following *** X,t∈[0,T],be an R~d-valued process defined on atime interval t∈[0,T].Let Y be a random value depending on the trajectory of *** that,at each fixedtime t≤T,the information available to an agent(an individual,a firm,or even a market)is the trajectory ofX before *** at time T,the random value of Y(ω) will become known to this *** question is:howwill this agent evaluate Y at the time t?We will introduce an evaluation operator ε[Y] to define the value of Y given by this agent at time *** ε[·] assigns an (X)0(?)s(?)T-dependent random variable Y to an (X)0(?)s(?)t-dependent random variableε[Y].We will mainly treat the situation in which the process X is a solution of a SDE (see equation (3.1.) withthe drift coefficient b and diffusion coefficient σcontaining an unknown parameter θ=θ.We then consider theso called super evaluation when the agent is a seller of the asset *** will prove that such super evaluation is afiltration consistent nonlinear *** some typical situations,we will prove that a filtration consistentnonlinear evaluation dominated by this super evaluation is a *** also consider the correspondingnonlinear Markovian situation.

关键词： option pricing measure of risk backward stochastic differential equation nonlinear potential theory nonlinear Markov property dynamic programming principle

Hearing Loss and Depressive Symptoms Among Community-Dwelling Older Adults-Liaoning,Henan,and Guangdong Provinces,china,201.-2020

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

china CDC weekly 2024年第32期6卷 811-815,I0002页

作者： Ran An Lu Cui Liyuan Yang Han Zhang shige Qi Haoyan Guo National Center for Chronic and Noncommunicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina School of Public Health Capital Medical UniversityBeijingChina Chengnan Community Health Service Center of Changping District BeijingChina National institute for Nutrition and Health Chinese Center for Disease Control and PreventionBeijingChina

Summary What is already known about this topic?More than half of Chinese older adults over 60 are suffering from hearing loss(HL),which might increase the risk of depressive *** is added by this report?The results indicated a significant association between severe or profound HL and depressive symptoms,characterized by notable age and gender disparities,particularly among women aged 60–74 years *** are the implications for public health practice?Timely intervention and treatment for elderly individuals with HL,particularly younger female elders suffering from severe or profound HL,are pivotal in reducing depressive symptom rates and are key policy considerations.

关键词： younger policy suffering

Boundary element-free method for elastodynamics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2005年第6期48卷 641-657页

作者： CHENG Yumin1.& peng Miaojuan2 1. Shanghai {1. of Applied mathematics and Mechanics, Shanghai university, Shanghai 200072, china 2. Department of Civil Engineering, Shanghai university, Shanghai 200072, china 1. Shanghai institute of Applied {1. and Mechanics Shanghai University 200072 Shanghai China 2. Department of Civil Engineering Shanghai University 200072 Shanghai China

The moving least-square approximation is discussed first. Sometimes the method can form an ill-conditioned equation system, and thus the solution cannot be obtained correctly. A Hilbert space is presented on which an orthogonal function system mixed a weight function is defined. Next the improved moving least-square approximation is discussed in detail. The improved method has higher computational efficiency and precision than the old method, and cannot form an ill-conditioned equation system. A boundary element-free method (BEFM) for elastodynamics problems is presented by combining the boundary integral equation method for elastodynamics and the improved moving least-square approximation. The boundary element-free method is a meshless method of boundary integral equation and is a direct numerical method compared with others, in which the basic unknowns are the real solutions of the nodal variables and the boundary conditions can be applied easily. The boundary element-free method has a higher computational efficiency and precision. In addition, the numerical procedure of the boundary element-free method for elastodynamics problems is presented in this paper. Finally, some numerical examples are given.

关键词： moving least-square approximation, improved moving least-square approximation, elastodynamics, boundary integral equation, meshless method, boundary element-free method, Fourier eigen transform.

Hearing Loss and Cognitive Impairment Among Community-Dwelling Older Adults-Liaoning,Henan,and Guangdong Provinces,china,201.-2020

在线全文

学校读者我要写书评

暂无评论

china CDC weekly 2024年第32期6卷 816-820,I0003页

作者： shige Qi Yuzhang Huang Liyuan Yang Haoyan Guo Ran An Lu Cui Han Zhang Jing Wu National Center for Chronic and Noncommunicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina Department of Health Policy Management Johns Hopkins University Bloomberg School of Public HealthBaltimoreMDUSA Chengnan Community Health Service Center of Changping District BeijingChina National institute for Nutrition and Health Chinese Center for Disease Control and PreventionBeijingChina School of Public Health Capital Medical UniversityBeijingChina

Summary What is already known about this topic?Many studies have shown that hearing loss(HL)is a risk factor for cognitive decline and dementia,but there are still limited studies on this association among Chinese older *** is added by this report?Based on the results of pure-tone audiometry tests,HL is associated with cognitive impairment in communitydwelling older *** odds ratios(ORs)were 1.23(1.08–1.40)for mild HL,1.55(1.32–1.82)for moderate HL,and 1.87(1.47–2.39)for severe or profound *** are the implications for public health practice?Enhanced public awareness of hearing protection is important for preventing cognitive *** is advocated to promote the screening of HL and cognitive function assessment in elderly health examinations or management in primary care services.

关键词： hearing Guangdong Henan

ON CONTROLLABILITY FOR STOCHASTIC CONTROL SYSTEMS WHEN THE COEFFICIENT IS TIME-VARIANT

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2010年第2期23卷 270-278页

作者： Feng LIU shige {1. School of ElecLronics and Information Engineering Beijing Jiaotong University Beijing 100044 China. School of mathematics and System Sciences Shandong University Ji'nan 250100 China

This paper investigates the controllability problem of time-variant linear stochastic controlsystems.A sufficient and necessary condition is established for stochastic exact controllability,whichprovides a useful algebraic criterion for stochastic control ***,when the stochasticsystems degenerate to deterministic systems,the algebraic criterion becomes the counterpart for thecomplete controllability of deterministic control systems.

关键词： Backward stochastic differential equation (BSDE) E-well-posedness Stochastic controlsystem stochastic exact controllability.

Time-Periodic Solutions to Quasilinear Hyperbolic Systems on General Networks

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 2024年第1期45卷 41-72页

作者： peng QU School of Mathematical Sciences Fudan UniversityShanghai 200433China

For quasilinear hyperbolic systems on general networks with time-periodic boundary-interface conditions with a dissipative structure,the existence and stability of the time-periodic classical solutions are discussed.

关键词： Time-periodic solution Quasilinear hyperbolic system General net-work Classical solution Asymptotic stability

SMALLEST g-SUPERSOLUTION FOR BSDE WITH CONTINUOUS DRIFT COEFFICIENTS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 2000年第3期21卷 359-366页

作者： LIN QINGQUAN (School of mathematics and System Science, Shandong {1., jinan 2.01.0, china.) peng shige(School of mathematics and System Science, Shandong {1., jinan 2.01.0, china.) E-mail: Linqingquan@math. sdu. cn peng@sdu. edu. cn School of mathematics and System Science Shandong University Jinan 250100 China

The authors prove the existence and uniqueness of smallest g-supersolution with an equality constrains on (y, z) for one demensional stochastic differential equations whose drift coefficients are continuous and linear... 详细信息

关键词： Backward stochastic differentail equation g-supersolution Constraint

Moment bounds for IID sequences under sublinear expectations

在线全文

学校读者我要写书评

暂无评论

Science china {1. 2011年第10期54卷 2155-2160页

作者： HU Feng1.2 1.epartment of mathematics,Qufu Normal {1.,Qufu 2731.5,china 2School of mathematics,Shandong {1.,jinan 2.01.0,china 1. Department of mathematics Qufu Normal University Qufu 273165 China2. School of Mathematics Shandong University Jinan 250100 China

With the notion of independent identically distributed(IID) random variables under sublinear expectations introduced by peng,we investigate moment bounds for IID sequences under sublinear expectations. We obtain a moment inequality for a sequence of IID random variables under sublinear expectations. As an application of this inequality,we get the following result:For any continuous functionsatisfying the growth condition |(x) | C(1.+ |x|p) for some C > 0,p 1.depending on ,the central limit theorem under sublinear expectations obtained by peng still holds.

关键词： moment bound sublinear expectation IID random variables G-normal distribution central limit theorem

Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

在线全文

学校读者我要写书评

暂无评论

china Foundry 2024年第1期21卷 82-90页

作者： Kun Gao Yan peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones