基于Coxian-2的相依风险模型的Gerber-Shiu惩罚函数

考虑一类具有相依结构的风险过程，索赔额与索赔间隔时间之间的相依关系由FGM联结函数确定，而索赔间隔时间服从Coxian-2分布.首先研究了广义Lundberg方程根分布的情况，然后得到了Gerber-Shiu惩罚函数满足的微积分方程、拉普拉斯变换以及瑕疵更新方程.最后，在指数索赔的条件下获得破产概率的解析表达式并做数值分析.     

带布朗扰动风险模型的有限时破产概率渐近性

考虑了一个带有常利率和布朗扰动的一般风险模型,这种风险模型不需要假设索赔来到时间间隔独立或者相依.当索赔额具有WUOD相依结构并且属于重尾分布族时,就得到了有限时破产概率的渐近表达式,这意味着布朗扰动对于有限时破产概率的渐近性没有影响.     

一类具有宽下限相依结构的索赔时间间隔分布的更新风险过程

研究一类特殊的更新风险过程,其索赔时间间隔服从宽下限相依分布、在索赔额序列为负相依同分布的重尾随机变量属于L∩D族的假设下,得到了有限时间破产概率的一致渐近性.     

相依风险模型中破产概率的一致渐近性

为了研究相依更新风险模型中的破产问题,首先研究了负相协更新计数过程,得到了该计数过程的一个渐近性结果;进而在此基础上考虑了相依重尾更新风险模型,其中索赔时间间隔为负相协同分布的随机变量,并且索赔额为独立同分布的随机变量,其共同的分布属于强次指数分布族;利用负相协随机变量的基本更新定理,得到了保险公司的有限时破产概率在时...     

基于进入过程的二维相依风险模型的有限时间破产概率

讨论基于进入过程的二维风险模型.假设保险公司有两种业务,相同业务的索赔额之间满足上尾渐近独立,不同业务的两计数过程满足一定的相依结构,在索赔分布属于D∩L族的条件下得到了二维相依风险模型有限时间破产的概率渐近表达式.     

时间相依复合更新风险模型中索赔过程的精细大偏差

考察了复合更新风险模型的精细大偏差。单次事故导致的索赔额为广义负上象限相依的且服从重尾分布的随机变量,单次事故引起的总索赔额与其对应的索赔时间间隔相依。     

负相依赔付下延迟风险模型的破产概率

考虑一类带常数利息力的延迟索赔更新风险模型,该模型中包含了两种索赔:主索赔和延迟索赔.在主索赔额、延迟索赔额序列各自为负相依同分布且属于重尾分布L∩D族随机变量序列的情形下,得到了有限时间破产概率的渐近等价表达式.     

基于互助保险的二元相依风险模型

在两家保险公司之间拥有相互弥补亏损协议的基础上,考虑这两家保险公司同时生存时索赔额之间基于Copula的相依关系.首先,给出了索赔到达率服从齐次复合Poisson过程的两家保险公司生存概率的积分-微分方程;其次,分别给出了索赔额分布为连续型随机变量和离散型随机变量的二元复合二项分布的生存概率的递归公式;最后,给出了索赔额分布为离散型随机变量的二元复合二项分布的生存概率的模拟计算.     

推广的潜在索赔风险模型的破产概率

改进了一类潜在索赔风险模型,把保费由固定变为取多个值的随机变量,将索赔额序列由独立推广到广义负相依,在假设索赔额分布为L∩D族情况下,得到了有限时间破产概率的一个渐近等价式.     

方差相关原理下相依聚合风险模型的贝叶斯保费

在经典的聚合风险模型中,常常假设索赔次数和索赔额是相互独立的,然而在实际保险业务中,索赔额和索赔次数常常呈现相依情形.本文通过引入Sarmanov-Lee相依分布族的概念,在索赔次数和索赔额呈现某种特定相依结构的条件下,研究了聚合风险模型下方差相关保费原理的聚合保费和贝叶斯保费,并通过数值模拟,对保费估计的稳健性进行了分析.结果表明,即使参数间的相依程度很小,也会对聚合风险保费和贝叶斯保费带来较大的影响.     

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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