也谈多种IP VPN技术的组网模式

本文从组网模式入手,对繁杂的IPVPN(IP Virtual Private Network,IP虚拟专用网络)技术进行分类比较,重点阐述了其在技术和适用领域上的不同点,并给出具体应用案例,以期读者能使用多种IPVPN技术灵活组网,设计出个性化的方案,以满足多样化、多层次的组网需求。     

IPVPN技术及应用

IPVPN可以非常方便地替代租用线和传统的ATM/帧中继(FR)VPN来连接计算机或局域网(LAN),同时还可以提供租用线的备份、冗余和峰值负载分担等,大大降低了成本费用。本文主要对IPVPN技术及应用进行论述。     

基于三层交换的IP VPN系统设计

对现有的IP VPN的三种互连方案进行讨论，并指出了这三种方案的主要缺点是：硬件成本较高，集中讨论了有关虚拟路由器的概念、协议、功能及虚拟路由器的IP VPN构建方案，重点讨论了使用虚拟路由器连接和实现IPVPN的三种方案，第二层的虚拟路由器到虚拟路由器的连接方案、多个虚拟路由器聚合到一个虚拟路由器上的方案、多个骨干网的聚合虚拟路由器到聚合虚拟路由器连接方案。     

浅谈EDA技术的发展与应用

信息化的社会,微电子技术和计算机技术不断发展.EDA技术作为一种新型的电子技术在当今社会中扮演着越来越重要的角色,成为了电子技术领域的排头兵.本文介绍了EDA技术的基本概念和发展过程,着重从四个方面介绍了EDA的一些最基本的特征.再简单介绍了一下在当今科技社会中EDA技术的广泛应用,最后阐述了在全球范围内EDA技术的发展程度和对我国EDA技术发展的展望.     

铁路简支箱梁一跨式支架现浇施工技术简

本文主要介绍一种关于铁路简支箱梁一跨式支架现浇施工技术.这种技术目前可以在铁路公路等运用,本文着重介绍在铁路的运用.本文重点介绍其工艺流程,对于在施工过程中其他的方面也进行了介绍,并且对于其施工质量控制和质量保证进行了探讨.     

基于Pro/ENGINEER系统的虚拟装配技术应用与研究

介绍了虚拟装配技术,在分析了虚拟装配技术基本思想后,提出在减速器设计中实施虚拟装配技术的方法和途径,规划了研究目标,并介绍了虚拟装配中的几个关键环节.成功地实现了减速器在计算机虚拟环境中的产品开发设计过程,缩短了产品开发周期.指出虚拟装配技术得到越来越广泛的应用.     

综述软交换技术在电力通信中的应用

本文介绍软交换技术在电力通信系统中的应用,并介绍了软交换技术的概念和主要功能.     

化纤工程专家设计系统的开发

详细介绍了CBR技术(Case Based Reasoning)及其用它开发的化纤工程初步设计系统.着重对在化纤工程设计中采用CBR技术的必要性、可能性及特点作了说明,同时介绍了物流技术及其在化纤工程设计中的应用.     

超导技术及其应用

本文介绍了超导技术的基本知识,着重介绍了超导技术在核聚变装置、磁悬浮列车、生物、医学上的应用,并展望了超导技术的应用前景.     

家畜微量元素补饲的研究及进展

家畜补饲一直是养殖业界人士所关注的重点之一.长期以来,为提高畜产品量,在人们不断的研究中,出现了各种不同的补饲技术.本文在简要介绍家畜补饲技术历史的同时,重点介绍了目前国际上最新最为流行的补饲技术———微量元素氨基酸鳌合物技术.     

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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