保费随机且带有红利支付的复合马尔可夫二项模型

本文对带有随机保费和红利支付的复合马尔可夫二项模型,得到了其Gerber-shiu期望折现罚金函数满足的递推公式,并证明了递推方程解的存在唯一性.最后给出了涉及破产量的几个例子.     

离散半马氏风险模型中的期望罚金函数（英文）

本文研究离散半马氏风险模型中的期望罚金函数,所考虑的模型包含了多个已有的风险模型,如(具有延迟索赔)复合二项模型和(具有延迟索赔)复合马氏二项模型.通过一个简单的方法得到了两状态模型中期望罚金函数的递推公式和初始值.我们也对所得结果给出了一些应用.     

保费随机复合二项模型的Gerber-shiu折现罚金函数

考虑保费随机收取的复合二项模型.得到了其Gerber-shiu折现罚金函数满足的递推公式,瑕疵更新方程及其渐近解,并且通过构造一个相关的复合几何分布函数,得到了这个更新方程的解析解.相应的也得到了一些相关精算量的渐近表示和分布函数,如破产前瞬时盈余分布的渐近解,导致破产的索赔额的分布函数.     

索赔为稀疏过程的风险模型的研究

提出了一种保费收取过程为二项过程而索赔过程为其稀疏过程的风险模型,讨论了该模型的Gerber-Shiu折现罚金函数,得到了Gerber-Shiu折现罚金函数所满足的更新方程和渐近估计式,并且根据Gerber-Shiu折现罚金函数的特点,还得到了一些相关精算量的渐近估计式.     

复合马尔可夫二项模型的Gerber-Shiu折现罚金函数

本文研究复合马尔可夫二项模型的Gerber-Shiu折现罚金函数,得到了有条件和无条件的Gerber-Shiu折现罚金函数所满足的瑕疵更新方程.然后给出这些折现罚金函数的渐近表达式.     

保费随机收取下带特殊分红策略的复合二项风险模型

本文讨论保费随机收取情形下带特殊分红策略的复合二项风险模型.考虑当盈余大于或等于一个给定的非负红利界并且索赔不发生时保险公司以一定概率给股东分红,得到该模型的罚金函数的递推公式,然后利用矩阵知识证明其存在唯一解,最后给出破产概率、破产时破产赤字分布概率函数的递推公式.     

一类随机利率下的破产时罚金折现期望

本文在经典风险模型下, 引进带有一种随机利率的破产时罚金折现期望的概念, 其利率的随机性通过标准Wiener过程和Poisson过程来描述. 给出破产时罚金折现期望所满足的更新方程, 并利用这个更新方程给出破产时罚金折现期望的渐近公式.     

重尾索赔下带干扰更新模型的破产理论

研究了带干扰的更新风险模型,得到了重尾索赔下罚金折现期望函数的渐近表达式.     

一类离散马氏调节风险模型的期望惩罚函数

本文将具有马尔科夫性质的随机保费收入以及随机分红策略引入到复合二项风险模型中,运用母函数的方法,得到了不同状态下期望惩罚函数的递推公式和初始值.最后,通过一个数值例子展示了破产概率关于初始盈余和分红边界的变化情况.     

数列的渐近展开和极限

把数列通项看作是母函数的幂级数展开系数,由母函数所满足的微分方程,得到了数列的递推关系式.把母函数展开为基本函数(1-x)~(-α)的线性叠加,由基本函数幂级数展开系数的渐近展开,得到了数列的渐近展开和一些极限值.     

Ruin problems for an autoregressive risk model with dependent rates of interest

In this paper, we consider a discrete insurance risk model in which the claims, the premiums and the rates of interest are assumed to have dependent autoregressive structures (AR(1)). We derive recursive and integral equations for expected discounted penalty function. By these equations, we obtain generalized Lundberg inequality for the infinite time severity of ruin and hence for the infinite time ruin probability, consider asymptotic formula for the finite time ruin probability when loss distributions have regularly varying tails, and study some probability properties of the duration of ruin.     

稀疏风险模型的期望折扣罚金函数

本文考虑了一类风险模型,其中保费到达过程是一个参数为$\lambda>0$的Poisson过程,而理赔过程是保费到达过程的稀疏过程. 在该模型下,我们得到了期望折扣罚金函数所满足的积分方程,积分--微分方程以及递推公式, 并且当保费和理赔额均为指数分布时,我们使用积分--微分方程获得了破产时刻的Laplace变换和在破产时刻的赤字的闭式表达式.     

The expected discounted penalty function for the perturbed compound Poisson risk process with constant interest

In this paper, we consider the Gerber-Shiu expected discounted penalty function for the perturbed compound Poisson risk process with constant force of interest. We decompose the Gerber-Shiu function into two parts: the expected discounted penalty at ruin that is caused by a claim and the expected discounted penalty at ruin due to oscillation. We derive the integral equations and the integro-differential equations for them. By solving the integro-differential equations we get some closed form expressions for the expected discounted penalty functions under certain assumptions.     

The Perturbed Compound Poisson Risk Process with Investment and Debit Interest

In this paper, we study absolute ruin questions for the perturbed compound Poisson risk process with investment and debit interests by the expected discounted penalty function at absolute ruin, which provides a unified means of studying the joint distribution of the absolute ruin time, the surplus immediately prior to absolute ruin time and the deficit at absolute ruin time. We first consider the stochastic Dirichlet problem and from which we derive a system of integro-differential equations and the boundary conditions satisfied by the function. Second, we derive the integral equations and a defective renewal equation under some special cases, then based on the defective renewal equation we give two asymptotic results for the expected discounted penalty function when the initial surplus tends to infinity for the light-tailed claims and heavy-tailed claims, respectively. Finally, we investigate some explicit solutions and numerical results when claim sizes are exponentially distributed.     

The Sparre Andersen Risk Process with Investment and Debit Interest

In this paper, we study absolute ruin problems for the Sparre Andersen risk process with generalized Erlang()-distributed inter-claim times, investment and debit interest. We first give a system of integro-differential equations with certain boundary conditions satisfied by the expected discounted penalty function at absolute ruin. Second, we obtain a defective renewal equation under some special cases, then based on the defective renewal equation we derive two asymptotic results for the expected discounted penalty function when the initial surplus tends to infinity for the light-tailed claims and heavy-tailed claims, respectively. Finally, we investigate some explicit solutions and numerical results for generalized Erlang(2) inter-claim times and exponential claims.     

On the time value of absolute ruin with tax

Consider a compound Poisson surplus process of an insurer with debit interest and tax payments. When the portfolio is in a profitable situation, the insurer may pay a certain proportion of the premium income as tax payments. When the portfolio is below zero, the insurer could borrow money at a debit interest rate to continue his/her business. Meanwhile, the insurer will repay the debts from his/her premium income. The negative surplus may return to a positive level except that the surplus is below a certain critical level. In the latter case, we say that absolute ruin occurs. In this paper, we discuss absolute ruin quantities by defining an expected discounted penalty function at absolute ruin. First, a system of integro-differential equations satisfied by the expected discounted penalty function is derived. Second, closed-form expressions for the expected discounted total sum of tax payments until absolute ruin and the Laplace-Stieltjes transform (LST) of the total duration of negative surplus are obtained. Third, for exponential individual claims, closed-form expressions for the absolute ruin probability, the LST of the time to absolute ruin, the distribution function of the deficit at absolute ruin and the expected accumulated discounted tax are given. Fourth, for general individual claim distributions, when the initial surplus goes to infinity, we show that the ratio of the absolute ruin probability with tax to that without tax goes to a positive constant which is greater than one. Finally, we investigate the asymptotic behavior of the absolute ruin probability of a modified risk model where the interest rate on a positive surplus is involved.     

The gerber-shiu expected discounted penalty function for Lévy insurance risk processes

In this paper,we study a general Lévy risk process with positive and negative jumps.A renewal equation and an infinite series expression are obtained for the expected discounted penalty function of this risk model.We also examine some asymptotic behaviors for the ruin probability as the initial capital tends to infinity.     

带常数边界的平衡更新风险模型的破产问题

本文讨论带常数边界的平衡更新风险模型的破产问题.利用Markov性质,给出惩罚函数满足的积分-微分方程,证明其惩罚函数可由更新风险模型的惩罚函数表示,并且给出一个具体的例子.