基于Merkle树的微支付方案

针对PayWord协议在频繁更换商家的场合中执行效率不高的问题,提出了一种基于Merkle。树的微支付方案,它通过使用MerKle树将散列链连接起来,使多个散列链共用一个消费者数字签名,从而减少了公钥签名的数量,节省了计算开销,适用于消费者对多个商家进行支付。此外,还对该方案进行了扩展,将消费者在支付过程中的计算量由0(n)降低到O(n^1/2),因此方案的执行效率大大提高。     

基于电子钱包的移动微支付方案

为了使移动微支付方案能够提供更安全便捷的支付服务,设计了一种基于电子钱包的微支付方案.该方案由用户、商家、可信支付平台(trusted payment platform,TPP)共同组成,电子钱包作为联系用户和商家的安全平台,可协助用户安全地完成移动微支付交易,且实现对微支付账户的管理和更新.利用哈希链生成支付节点,使用对称加密算法和公钥签名算法对数字交易过程进行加密并提供身份认证服务.结果表明,电子钱包的引入可以及时检测到用户的二次花费,该方案安全性能好,系统运行效率高.     

基于可验证秘密分享的移动代理安全支付协议

移动代理的安全问题是移动代理技术面临的一个很大障碍,为保护移动代理支付时的信息安全,采用Pedersen可验证秘密分享方案,设计了一个基于移动代理技术的安全支付协议．文中详细分析和讨论了协议的性能,包括安全性、不可否认性以及协议的运行效率．结果表明,和已有的方案相比,该协议在保证具有合适运行效率的同时,弱化了已有方案的安全执行条件,增加了系统的安全性和灵活性,因此具有更好的应用价值。     

一种基于概率投票的新型高效微支付方案

提出了一种新型的高效微支付方案,它允许客户使用一个由银行签名的公钥证书与多个商家进行交易,通过在支付阶段采用概率投票的方法,大大减少了客户进行超支花费的概率．在本方案中,因客户超支花费而造成的经济损失是由商家和银行共同承担的,且循环交互支付协议也使客户和商家的利益都得到了保障．与PayWord方案相比,其公平性大大提高,并为客户提供了有限的匿名性。     

浅议在线支付的安全与可行性

在线支付是电子商务中极其关键的一环。只有实现了在线支付,才能进行真正意义上的电子商务交易,否则电子商务只能停留在网上信息发布与搜索、初步意向达成和草签协议阶段,而是否采用在线支付最主要考虑的因素就是安全。我国电子商务和网上交易近年来取得了较大的发展,然而也存在很多问题,其中在线支付就是我国电子商务发展的瓶颈之一。这篇文章主要分析了在线支付的安全性和可行性,并通过对在线支付系统的总体设计,主要讨论了如何更加安全地实现网上交易,支付系统网络组网方案,支付系统数据库设计,在线支付确认系统设计等问题,重点讨论如何建立支付确认系统进行支付确认,如何为消费者提供更多更方便的支付方式,探索建立更加安全,更加快捷的支付系统。     

微支付系统解决方案的研究

主要是对电子商务中微支付系统的解决方案作一些理论研究,探讨了微支付的具体内容,阐述了常用解决方案中的数字现金和数字钱包以及对国外目前在这方面所进行的研究方向作了分析,同时对目前微支付系统发展所面临的问题提出一些个人见解.     

一种改进的离线电子现金方案

在分析Brands的受限盲签名方案的基础上提出了一个改进的电子现金支付新方案，基于此构建了一个不带“观察器”的简约高效电子现金方案，详细描述了离线电子现金支付方案作提取、支付和存储三个协议．分析了新方案的效率和安全性，与Brands的电子现金协议相比，在不降低安全他的前提下提高了处理效率、增加了灵活性，尤其适用于因持网上的小额支付．     

成本最小化与最小支付模式在电力市场中的比较研究

为了使电力定价市场化、明朗化，电力市场中运用了很多优化方法对电力进行定价．传统的成本最小化模型已受到众多电力公司的亲睐，最近又有许多文献提出新的定价模式——最小支付模型．旨在为消费者提供更低廉的电，而不惜采用更高的运行成本．针对这两种定价模式进行了比较分析，结果表明：最小支付模型并不一定总能给消费者带来利益，从长远来看，甚至可能会使消费者支付更多．     

移动电子商务微支付协议的改进

基于PKI(public key infrastructure)及Payword微支付机制,提出了一种只涉及到用户、商家和移动网络运营商的移动电子商务微支付协议。该支付协议适合于移动手机用户和大部分网络商家进行频繁交易,不仅保证了用户交易的安全性、不可否认性,还解决了交易商品只限于多媒体业务的瓶颈问题。同时在支付阶段提出暂扣付费的方案,在最大程度上保证了交易的公平性,有效地避免了恶意透支以及商业欺诈行为。     

移动电子商务微支付协议的改进

基于PKI(public key infrastructure)及Payword微支付机制,提出了一种只涉及到用户、商家和移动网络运营商的移动电子商务微支付协议.该支付协议适合于移动手机用户和大部分网络商家进行频繁交易,不仅保证了用户交易的安全性、不可否认性,还解决了交易商品只限于多媒体业务的瓶颈问题.同时在支付阶段提出暂扣付费的方案,在最大程度上保证了交易的公平性,有效地避免了恶意透支以及商业欺诈行为.     

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