EPV算子在障碍期权定价中的应用(英文)

讨论了在一般Levy过程下的障碍期权定价方法.其障碍是随时间线性变化的,且当标的资产价值超过该障碍时,该期权变为一个普通的美式期权.首先应用EPV算子解决一个带有分红的最优停时问题并应用该结果来定价美式看跌期权.然后,对于永久性的障碍期权,推导出了明确的定价公式,而对于具有有限到期日的该种期权,应用随机化的方法估计该期权的价值.     

随机利率和随机寿命下的欧式未定权益定价

在Hull-Whire利率模型且股票价格遵循指数0-U过程的情形下,讨论了有连续红利的一般欧式股票期权和外汇期权定价,并进一步考虑了合约在到期日前被终止的可能性,得到了随机寿命下的欧式未定权益的定价公式．     

随机利率和跳-扩散过程下具有随机寿命的未定权益定价

在利率服从Hull-White-Vasicek利率模型、风险资产服从跳-扩散过程的假设下,建立具有随机寿命的欧式未定权益定价模型.对具有随机寿命的养老金合约、保险合同、股票期权、远期合约和可转换债券等欧式未定权益进行定价,得到具体的欧式未定权益定价公式.     

标的资产服从一般Ito随机过程的期权定价模型

首先介绍标准的B1acke-Scholes期权定价模型，然后在假设标的资产(以股票为例)价格服从一般的Ito随机过程，即标的股票价格变化为非线性的情况下，推导了一个新的期权定价模型，结合边界条件给出了数值求解该方程的有限差分法，推广了一些已有的结果。     

沪市认购权证与标的股票的高频数据协整分析

权证定价常采用Black-Scholes期权定价模型,但Black-Scholes期权定价模型有很多严格的假设条件,标的资产对定价的影响较大.当权证与标的股票之间不存在协整关系时,Black-Scholes期权定价模型不能有效确定权证的价格.应用EG两步检验法和Johansen检验法对沪市认购权证和其标的股票进行协整检验,检验结果表明权证和其标的股票之间不存在协整关系.认购权证的价格走势脱离其标的股票而独立运动,这使得应用Black-Scholes期权定价模型为权证定价具有一定的局限性.我国的权证市场有很大的投机性.     

带有信用风险的远期起点期权定价

远期起点期权是一种路径依赖型期权,由于它具有远期开始的性质,因此受到投资者的关注,给该期权进行合理定价具有重要意义.首先建立有多个扩散源的标的资产价格过程和承约方资产价格过程的随机微分方程,然后通过测度变换的方法推导出了带有信用风险的远期起点期权的定价公式,推广了以前的相关结果.     

基于Hull-White利率下O-U过程的复合期权定价

采用Hull-White模型和指数O-U过程来刻画利率和股票价格的变化规律,考虑到标的资产价格和利率的随机性与均值回复性,利用鞅理论和Girsanov定理,研究了股票价格在随机利率下遵循指数O-U过程的复合期权定价问题,得到了复合期权的定价公式.     

对欧式期权B-S模型的推广

对欧式期权定价的B-S模型进行了推广。即假设股票价格过程服从布朗运动和泊松过程，且在有效期连续分红的情况下，导出股票衍生证券的定价模型及其推广形式，并得到相应的求解公式，同时表明了传统的定价公式是新公式的特殊情况。     

随机利率分数布朗运动模型下的欧式双向期权定价

在经典的期权定价模型中,假设股票价格服从标准几何布朗运动,但金融实证表明用分数布朗运动描述股票价格过程更贴近市场.假设标的资产服从几何分数布朗运动,无风险利率r(t)服从Vasicek扩展模型,红利率q(t),波动率σ(t)为随时间变化的确定函数,运用拟鞅及测度变换的方法求出了欧式双向期权的定价公式.     

美式看跌期权的数值解法

建立了标的资产具有连续分红和交易成本的美式看跌期权的定价模型,通过无套利定价原理把该定价模型转化为带边界的变系数偏随机微分方程.采用隐式差分法对该随机随机微分方程离散化,并通过MATLAB编写出相应的求解算法,计算出在不同时间和不同股票价格所对应的美式看跌期权的最优执行价格.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.