基于改进OBS的iSCSI SAN

近年来，光突发交换（OBS）作为一种在目前技术条件下承载IP数据的理想光交换方案得到了广泛的关注，同时iSCSI协议的提出则为构筑以IP传输为基础的企业级存储区域网络（SAN）提供了有力的支持。在不同于传统的基于千兆以太网的iSCSISAN网络体系的基础上，提出了一种基于改进的OBS的iSCSISAN体系结构．通过对OBS技术进行适应性的改进，充分利用了OBS作为承载IP数据的光交换技术的高数据吞吐量的优点，以及iSCSI协议所提供的SAN与IP网络的紧密结合技术，为构筑企业级高性能IPSAN开辟了一条新的途径。     

IP技术在ATM的应用

本文讨论了IP与ATM集成技术的两种互通模型，阐述了IP在ATM上的典型应用技术Classcal IPOA、MPOA及IP交换的实现原理，并进行了性能分析。     

IP与ATM结合技术的探讨

本文从IP与ATM结合技术的分类出发，从技术原理上分析了重叠技术和集成技术中的典型技术，最后介绍了IP与ATM结合技术的一个具体解决方案－多协议标记交换（MPLS）。     

通信网络技术及网络发展趋势

本文分析比较了目前通信领域的几种交换技术，详细阐述了电路交换技术、包交换技术、IP技术、ATM技术和传送用技术的信息交换原理压各自的优缺点。根据通信技术的发展趋势和应用需求，对未来信息网络的发展进行了预测。     

下一代组网技术——MPLS

随着Intemet的飞速发展，基于IP的网络已经不能满足人们的需求，MPLS（MultiProtocol Label Switching，多协议标签交换）组网技术作为一种新兴的网络解决方案，它将ATM快速交换技术和IP动态路由协议完美的结合起来，提高了Internet的速度和可扩展性。文章对MPLS的产生背景，基本原理及应用前景等方面进行了论述。     

MPLS支持移动IP技术

移动IP是一种在全球Internet上为移动节点提供移动功能的方案。基于MPLS的移动IP技术可以将MPLS的技术优势整合到移动IP中。介绍了MPLS与移动IP结合的网络结构，研究了MPLS与移动IP技术结合下的移动节点注册及路由、切换时标签交换路径的构建机制。     

面向NGN的lP软交换关键技术与协议分析

本文探讨了NGN与IP软交换的技术关系,面向NGN的IP软交换关键技术,对软件交换技术进行了探讨。     

面向NGN的IP软交换关键技术与协议分析

本文探讨了NGN与IP软交换的技术关系,面向NGN的IP软交换关键技术,对软件交换技术进行了探讨。     

卫星网络中IP路由技术的研究

为了能够使卫星网络具有许多IP技术的优势，分析了IP路由在卫星网络中应用在网络组播，保证QoS和网络安全性等方面的优点，提出了卫星网络上应用IP路由可能会出现IP包的不确定性，路由表的大小、复杂性，路由交换速度等问题，并给出了其相应问题的解决方案。     

基于改进OBS的iSCSI SAN

近年来,光突发交换（OBS）作为一种在目前技术条件下承载IP数据的理想光交换方案得到了广泛的关注,同时iSCSI协议的提出则为构筑以IP传输为基础的企业级存储区域网络（SAN）提供了有力的支持。在不同于传统的基于千兆以太网的iSCSI SAN网络体系的基础上,提出了一种基于改进的OBS的iSCSI SAN体系结构,通过对OBS技术进行适应性的改进,充分利用了OBS作为承载IP数据的光交换技术的高数据吞吐量的优点,以及iSCSI协议所提供的SAN与IP网络的紧密结合技术,为构筑企业级高性能IP SAN开辟了     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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