不完全信息下的风险最小复制策略

在假定市场中存在等价鞅测度的条件下,研究未定权益在不完全信息下的风险最小复制问题．首先考虑的是获取信息无花费,且假定投资者只能获取市场中部分信息的情形．随后考虑获取信息有花费的问题．在考虑这一问题时,着重分析了完全信息和不完全信息下的风险最小复制策略．证明在适当条件下风险最小复制策略是存在唯一的．     

Heston模型的效用无差别定价和套期保值

在风险资产服从Heston模型的假设下,研究了指数效用函数的无差别定价和套期保值问题.利用动态规划方法得到Heston模型的效用无差别定价的公式和套期保值策略.并利用效用无差别定价的性质构造了最小熵鞅测度,证明了最小鞅测度与极小熵鞅测度是一致的.     

M-P逆与一般B-S模型中的等价鞅测度

在一般B-S模型中,为了得到等价鞅测度,首先必须解出风险溢价方程.为此,经典方法总是假定扩散矩阵几乎处处是满秩的.文章利用代数中的M-P逆理论,证明了即使扩散矩阵不满足这个条件,M-P逆方法是一种求解风险溢价方程的有效方法.根据最小化风险溢价过程模的标准,文章利用M-P逆找到了一个唯一的等价鞅测度,并证明了在一定条件下,B-S模型中的Esscher测度、最小熵鞅测度和逆相对熵鞅测度鞅测度实际上就是这个等价鞅测度.     

不对称信息市场和极小鞅测度

市场信息在投资决策中起重要作用.在构造风险最小套期保值策略时,寻找极小鞅测度往往是最重要的一个环节.构建了2类不同信息市场,比较了其无套利性和完备性,并讨论了2类市场中极小鞅测度之间的关系.     

非风险中性定价意义下欧式未定权益定价及其套期保值策略

在非风险中性定价意义下,研究了欧式未定权益的定价和套期保值策略.通过期权价格过程的分布,利用等价鞅测度,分别在有红利和无红利两种情况下,得到了广义的欧式期权定价公式,也给出了欧式卖权和买权之间的平价关系;利用伊藤公式,得到欧式卖权和买权的套期保值策略.这些结果包含了在风险中性意义下原始的欧式期权定价公式和套期保值策略.     

离散时间模型的指数效用无差别定价和最小熵鞅测度

研究了单阶段模型的指数效用无差别定价和最小熵鞅测度,得到了指数效用的无差别定价的精确解,并利用无差别定价的极限构造了最小熵鞅测度的表达式,解决了不完全市场的未定权益的定价问题.     

随机波动率模型下几何平均亚式期权的定价

假设股票价格波动率服从对数正态分布,在此随机波动率模型下,利用等价鞅测度变换,得到了最小等价鞅测度下固定执行价格的几何平均亚式期权定价公式,并讨论了其近似解的求法.     

Esscher-变换与风险测度技术

通过研究精算学中Esscher 变换技术及其对于金融市场中风险资产无套利原则的刻画,反映其在金融市场风险管理技术中的应用,证明了无套利原则、等价鞅测度的存在性和Esscher 变换在所建立的Hilbert 空间下的一致性,并建立了在无套利条件下求解鞅性成立的Esscher 变换下概率测度变换参数的方法。讨论了Esscher 变换在金融市场风险管理策略的选择问题中的应用,得到了组合融资最优策略的Esscher 变换参数的解析式。     

最小对称κ熵鞅测度和不完全市场中的定价问题

在等价鞅测度M_e≠■前提下,首先给出最小对称κ熵鞅测度的定义;其次给出最小对称κ熵鞅测度存在的充分条件,进而再给出最小对称κ熵鞅测度的密度表示(Radon-Nikodym导数);最后讨论最小对称κ熵鞅测度的存在性和不完全市场的效用函数最大化是等价的.     

马尔科夫转换模型下的套期保值策略研究

考虑微观市场和宏观经济两种风险因素,利用非广延统计理论和马尔科夫过程建立了具有体制转换性质的资产价格模型,运用等价鞅测度、效用无差别定价方法和随机动态控制理论,得到了等价鞅测度参数所满足的线性规划方程和最优套期保值策略。     

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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