多险种的Cox风险模型

经典风险模型描述的险种是单一的,并且假设保费收入是线性增长的。事实上保险公司的经营是多元化的。为此,将经典风险模型进行了推广,建立了理赔次数服从Cox过程的多险种的风险模型,并运用鞅方法得到了破产概率的上界,进一步考虑到理赔次数对保费收入的影响,得到了其改进模型及其结果。     

多险种的Cox风险模型

作为经典风险模型的一个推广,构造一种理赔次数服从Cox过程,且具有相依关系的多险种同时并存的风险模型,运用鞅方法得到破产概率的上界.并在理赔发生过程简化为混合Poisson过程时,通过应用Markov链的性质,获得终极破产概率应满足的积分方程.     

稀疏过程下双Cox混合再保险风险模型的破产概率

研究了一类带投资和干扰的双险种再保险模型,考虑保单到达过程和理赔过程均为Cox过程,且后者是前者的一个p-稀疏过程,针对该改进模型,得到破产概率满足的上界及推广的Lundberg不等式。     

一类马尔可夫风险模型罚金函数的期望

研究了一类马尔可夫风险模型的罚金函数,得到了罚金函数的期望所满足的积分方程,并由所得到的积分方程推出了破产概率所满足的积分方程及破产赤字的分布函数、破产赤字与破产前瞬时盈余的联合分布函数所满足的积分方程．     

常利率影响下调整下限风险模型的破产概率

 在引入常利率因素的基础上,讨论了当保险费率按公司的盈余进行适当调整时的风险模型,并且得到了当盈余低于某个下限时,保险公司适当提高保费的破产概率.     

带干扰的双复合泊松风险模型的近似推广

引入带干扰的双复合poisson风险模型,接着利用正态近似和平移伽玛近似对模型进行推广,最终得到破产概率的简单计算公式及它的一个上界。     

复合混合Poisson模型中的破产概率

论文研究了复合混合Poisson过程在有Wiener过程干扰时的破产概率,当理赔额分布是轻尾时,得到了破产概率的渐近形式。     

带干扰的马氏环境下的破产概率

主要讨论了带干扰的马氏环境下的破产概率,在该模型中,顾客索赔到来次数由一个点过程{Nt,t≥0}来描述,且该点过程是-Cox过程．同时本文还比较了带干扰的经典风险模型与该模型下的破产概率,最后得到了破产概率的渐近估计下界。     

一类风险模型的破产概率

考虑了一类多险种多索赔情形的风险模型.首先,证明了调节系数的存在唯一性,进而利用鞅的相关不等式及性质,得到了破产概率的Lundberg不等式及一般表达式;然后,通过模型转换,考虑充分小时段内的索赔情况,利用全概率公式得到了生存概率满足的积分-微分方程;最后,考虑两险种且索赔额服从指数分布这一特定情况,结合前面得到的积分-微分方程和经典风险理论的结果,给出了该特定情况下破产概率的显式表达式.     

双Cox风险模型

 双Cox风险模型作为经典风险模型的一个推广,在保费的到达和理赔的发生都服从Cox过程的假定下,得到了破产概率的上界.并在假设保单的到达和理赔的发生具有相同的累积强度过程时,给出了破产概率的明确表达式.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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