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1.
借鉴Merton的跳跃扩散模型的思想,根据中国股市的具体情况,用含有Poisson过程的Ito-Skorohod随机微分方程描述股票价格的运动.利用鞅定价技巧(风险中性方法)推导出考虑涨跌停规则的跳跃扩散的股票期权在t时刻的价格公式,并利用随机模拟和中心极限定理讨论如何具体计算股票期权的价格.  相似文献   

2.
本文给出了保险精算方法,对标的资产价格遵循B—S模型下重设型卖权进行定价,给出了不支付红利的欧式重设型卖权的定价公式。  相似文献   

3.
假设无风险利率是随机利率,在考虑基础变量-无风险证券(债券)和风险证券(股票)价格行为特征的基础上,利用鞅方法推导了随机利率下重设型卖权的定价公式。  相似文献   

4.
跳扩散模型的期权定价   总被引:2,自引:0,他引:2  
Merton在1976年建立了著名的跳扩散模型,本文利用了随机分析中的鞅方法推广了Merton关于欧式期权定价的结果,讨论了跳扩散模型的一般情形:假定股票价格过程遵循Poisson跳跃的扩散过程,股票预期收益率,波动率和无风险利率均为时间的函数,以及风险资产支付红利,并且有依赖于时间参数的红利率的情况下,获得了欧式期权的定价公式和买权与卖权之间的平价关系。  相似文献   

5.
为解决正态跳扩散运动过程模型的外汇期权定价的问题.在外汇汇率的相对跳跃高度服从对数二项式分布运动的条件下,建立相应的正态跳扩散模型,采用风险中性测度原理、It?公式以及推广的Girsanov定理等方法,得到了刻画外汇期权买权的定价公式.利用外汇期权看涨-看跌的平价公式,得出外汇期权卖权的定价公式.研究结果:发展和完善了外汇期权市场和外汇期权定价理论.  相似文献   

6.
跳扩散模型中交换期权的定价   总被引:4,自引:0,他引:4  
考虑跳扩散模型中交换期权的定价问题。在一个由无风险债券以及2项风险资产构成的金融市场中,风险资产的价格由布朗运动和泊松过程控制。利用鞅测度理论求出交换期权满足的积分微分方程,并得到期权定价的显式公式。  相似文献   

7.
研究资产价格的波动,可以观察到资产价格中有偶然的跳,这样的跳可能反应新的信息的到达.将考虑在风险中性世界下,标的资产价格服从跳扩散过程的商期权定价公式,其中跳跃次数服从泊松分布,每次跳跃的比率为一个随机变量,服从对数正态分布.  相似文献   

8.
有多个跳跃源的信用风险欧式期权定价公式   总被引:3,自引:2,他引:3  
在公司价值型信用风险欧式期权模型的基础上,进一步考虑标的资产受多个跳跃源影响的情况,用含有多维Poisson过程的Ito-Skorohod随机微分方程描述标的资产价格的运动,应用等价鞅测度变换方法导出相应的信用风险欧式期权定价公式,并讨论了利率,波动率及债务不是常数情况下的推广形式。  相似文献   

9.
讨论了基于跳跃--扩散资产价值过程的信用风险债券的定价.通过引进倒闭过程给出了以零息票债券价格为基础的信用风险债券价值构成,在风险中性概率测度下得到了信用风险零息票债券的定价公式.  相似文献   

10.
与股票相关的欧式汇率买入期权定价公式   总被引:2,自引:0,他引:2  
在标的资产价格服从对数正态过程的条件下,研究与股票相关联的欧式汇率买入期权的定价问题.将对数正态扩散过程表达的随机过程转化为风险中性,并在此条件下用鞅定价方法推导出与股票相关联的欧式汇率买入期权的价格公式.  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
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。  相似文献   

16.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

17.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

18.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

19.
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.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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