基于风险溢出的股市双层风险传染模型

从风险关联网络视角出发,根据股票节点的风险溢出水平差异对其进行分层处理,提出股市风险双层传染机制,并基于网络异质性结构对传统SIRS模型提出改进,采用风险溢出效率定义感染率参数.最后,以深证300成分股作为样本数据计算模型相关参数,并进行股市极端风险传染演化仿真分析.研究结果表明：双层传染机制下股市风险传导效应更强,少数风险溢出水平较高的股票节点对风险传染的贡献远高于风险溢出水平较低的其他节点,一旦这些企业发生危机,对股市系统的冲击性和影响力都更大.     

基于主体的非均衡人工股市计算模型

对SFI系列基于主体的人工股市计算模型进行了改进,改变了资产定价机制,剔除了均衡定价方法,在学习分类器系统中引入了模糊处理环节,并改变了主体的学习方式,使得人工市场中同时包含具有不同学习速度的主体。基于此构建的新人工股市仿真模型的运行结果具有真实股市数据的形式化特征,通过比较不同学习速度的主体以及零智能主体的表现,发现人工股市计算模型中学习对于主体的财富有决定性作用,学习速度也会影响主体的表现,而且学习存在一个限度问题,过多的累积学习次数反而会削弱主体聚集财富的能力,这在基于主体的人工市场的构建中是一个值得重点关注的方面。     

基于COMSOLMultiphysics的等离子体气动激励系统仿真

为了揭示介质阻挡放电产生等离子体过程中电参数的演化机制,进行基于COMSOL Multiphysics的等离子体放电系统仿真研究.利用一个空间二维大气压下氩等离子体模型对其中的主要粒子在不同脉冲情况下的变化规律进行研究,与物理事实吻合较好,具有很好的拓展价值和实用意义.     

股票投资策略选择的计算机仿真

利用基于Agent的圣塔菲人工股市模型,在博弈论的框架下,采用计算机仿真的方法分析了股市投资者的策略选择.发现仅采用基本面分析是理性投资者的占优策略.这一结论基本与标准的有效市场理论对基本面分析的认识相吻合.     

基于预期的股价波动混沌模型研究

本文基于股市中对价格的预期建立一个模型,此模型能够解释价格波动中存在的混沌行为. 文中用Li-York定理证明了股票市场具有混沌特征,并得到了系统发生混沌的充要条件. 最后在模型研究的基础上给出了市场宏观调控的相关建议.     

虚拟股市建模与混沌分析

从证券市场的微观结构入手 ,建立了基于Multi_Agent的股市模型 .计算了模型产生的股价时间序列的Lyapunov指数和关联维 ,并对其进行主分量分析 .对比研究表明 :该模型不仅能产生与真实股市极为相似的股价走势 ,而且其混沌行为与真实股市有深刻的一致性 ,可以通过对此模型的深入研究揭示真实股票市场这类复杂系统的演化规律与运作机理 .     

庄家与政府的博弈分析

在我国股市的发展过程中,庄家起着特殊的作用,而政策的变化是造成股市异常波动的首要因素.本文建立了一个庄家与政府博弈模型,政府的决策目标是股市的健康发展,庄家的决策目标是追求最大收益,通过对博弈模型的求解,说明入市资金的稳定增长是我国股市健康发展的关键.在结论中对政府改善管理和庄家的操作提出了建议.     

一个典型随动系统的键合图模型及仿真

健合图模型是描述动态物理系统的一种新的图示模型.通过该模型很容易得到系统的状态空间描述。特别适宜于系统的数字仿真.本文以一个典型的随动系统的实例说明了该方法的建模过程及其仿真.其结果表明该建模过程及仿真简单、可靠.     

带有QoS的分布式仿真通信机制研究

QoS和分布式虚拟仿真都是近年来研究的热点,分布式虚拟仿真系统中对于通信机制的QoS 要求很大程度上决定了仿真系统的准确性和实时性.以一个飞机仿真训练系统为基础,重点讨论了分布式仿真系统中的通信机制及对通信的QoS请求,建立了基于内容的区分队列模型,模型采用CBWFQ基础上的LLQ队列调度算法来满足IP请求的QoS,提高了分布式仿真的实时性和准确性,并通过试验分析验证了模型的可用性.     

基于多Agent的生态复杂适应系统建模和仿真

为了再现真实草原生态系统,在保留生态复杂适应系统多样性的同时,反映生态系统的一般特性,在复杂适应系统理论基础上,利用多Agent的建模仿真方法,以反应型Agent为基础建立了一个生态系统的模型.利用多Agent仿真平台NetLogo仿真了该模型,通过调整环境因素和各类参数,使模型涌现出草原生态系统的各种现象.仿真结果验...     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has