Optimal dynamic reinsurance with dependent risks: variance premium principle

In this paper, we consider the optimal proportional reinsurance strategy in a risk model with two dependent classes of insurance business, where the two claim number processes are correlated through a common shock component. Under the criterion of maximizing the expected exponential utility with the variance premium principle, we adopt a nonstandard approach to examining the existence and uniqueness of the optimal reinsurance strategy. Using the technique of stochastic control theory, closed-form expressions for the optimal strategy and the value function are derived for the compound Poisson risk model as well as for the Brownian motion risk model. From the numerical examples, we see that the optimal results for the compound Poisson risk model are very different from those for the diffusion model. The former depends not only on the safety loading, time, and the interest rate, but also on the claim size distributions and the claim number processes, while the latter depends only on the safety loading, time, and the interest rate.     

Optimal investment-consumption-insurance with random parameters

This paper discusses an optimal investment, consumption, and life insurance purchase problem for a wage earner in a complete market with Brownian information. Specifically, we assume that the parameters governing the market model and the wage earner, including the interest rate, appreciation rate, volatility, force of mortality, premium-insurance ratio, income and discount rate, are all random processes adapted to the Brownian motion filtration. Our modeling framework is very general, which allows these random parameters to be unbounded, non-Markovian functionals of the underlying Brownian motion. Suppose that the wage earner’s preference is described by a power utility. The wage earner’s problem is then to choose an optimal investment-consumption-insurance strategy so as to maximize the expected, discounted utilities from intertemporal consumption, legacy and terminal wealth over an uncertain lifetime horizon. We use a novel approach, which combines the Hamilton–Jacobi–Bellman equation and backward stochastic differential equation (BSDE) to solve this problem. In general, we give explicit expressions for the optimal investment-consumption-insurance strategy and the value function in terms of the solutions to two BSDEs. To illustrate our results, we provide closed-form solutions to the problem with stochastic income, stochastic mortality, and stochastic appreciation rate, respectively.     

Reserves and cash flows under stochastic retirement

Uncertain time of retirement and uncertain structure of retirement benefits are risk factors for life insurance companies. Nevertheless, classical life insurance models assume these are deterministic. In this paper, we include the risk from stochastic time of retirement and stochastic benefit structure in a classical finite-state Markov model for a life insurance contract. We include discontinuities in the distribution of the retirement time. First, we derive formulas for appropriate scaling of the benefits according to the time of retirement and discuss the link between the scaling and the guarantees provided. Stochastic retirement creates a need to rethink the construction of disability products for high ages and ways to handle this are discussed. We show how to calculate market reserves and how to use modified transition probabilities to calculate expected cash flows without significantly more complexity than in the traditional model. At last, we demonstrate the impact of stochastic retirement on market reserves and expected cash flow in numerical examples.     

Barrier present value maximization for a diffusion model of insurance surplus

In this paper, we study a barrier present value (BPV) maximization problem for an insurance entity whose surplus process follows an arithmetic Brownian motion. The BPV is defined as the expected discounted value of a payment made at the time when the surplus process reaches a high barrier level. The insurance entity buys proportional reinsurance and invests in a Black–Scholes market to maximize the BPV. We show that the maximal BPV function is a classical solution to the corresponding Hamilton–Jacobi–Bellman equation and is three times continuously differentiable using a novel operator. Its associated optimal reinsurance-investment control policy is determined by verification techniques.     

A Qualitative Study for Measuring Warehouse Performance Using Triangulation Approach

This research aims to validate a structural equation modeling （SEM） model for measuring warehouse performance using data from an international company in Australia （company G）. Moreover, a methodological triangulation method was also adopted to test whether different methodological approaches produce convergent findings about warehouse performance measurement （WPM）. These three different methods are the SEM model, the multiple case research study, and validation of the SEM model using data from 80 companies in Thailand and a company in Australia. With the results from the triangulation method, it is obvious that the SEM model can be used to measure the performance of warehouses in Thailand and Australia. Since the SEM model consists only of significant indicators, it is more appropriate than company G＇s scorecard. Furthermore, the SEM model can overcome the limitations of traditional models by allowing companies to compare their performance over time.     

以迪斯尼为案例浅谈全球化趋势下的跨文化营销

在国际营销活动中,文化环境是极其重要而又极易被忽略的一个因素,文化差异往往成为企业跨国经营的无形壁垒。那么在国际营销过程中,文化差异问题该如何解决?本人个人认为,主动调整营销战略,积极融入当地市场是最好的解决方法。本文从文化差异的角度着手,以迪斯尼乐园为案例,通过对其在跨文化经营中的成功和失败的案例进行分析,阐述了跨文化运营中存在的问题,并提出了一些相关建议。     

论《新装》中女主人公梅布尔矛盾的双重性格

《新装》是英国著名意识流小说家弗吉尼亚.伍尔夫的短篇小说之一,小说刻划了女主人公梅布尔矛盾的双重性格特征：既爱慕虚荣又渴望诚实,既自卑绝望又充满希望,既羡慕嫉妒又厌恶憎恨,既懦弱多变又勇敢坚强,既追求个性又迷失自我。从她矛盾的双重性格特征中可以看出人的本性及弱点。     

国际贸易与文化制度差异的理论模型分析

国家间文化制度差异可以成为专业化分工和比较优势产生的原因之一,且这种差异并不会随着贸易的开展而消除,贸易不能促成国家间文化制度的融合,其巩固国家间文化制度差异,即使存在替代性文化制度均衡且向这种均衡的转变是帕累托改进的;向优等文化制度转变可能发生分配影响,在可能性条件下,雇员在封闭条件下可以通过转变获得福利提升,而雇主则相反.     

后金融危机时代会计计量

此次百年不遇的金融危机充分暴露了现行会计公允价值计量的弊端。要使会计计量准确合理、会计信息可靠有效，必须解决资产、负债价值计量、会计计量模式选择、净资产与所有者权益关系、负债价值变动对利润的影响以及会计等式形成等问题．     

一类含四个未知函数的方程的非平凡解的存在性的研究

本文利用亚纯函数值分布论的思想方法,对函数方程f117(z)+f127(z)+f317(z)+f147(z)=z非平凡解的状况进行研究,得到如下结果:函数方程f117(z)+f217(z)+f317(z)+f417(z)=z不存在级小于117的非常数亚纯函数解。