基于统一身份认证的OpenVPN系统的设计与实现

为方便教职工在校园网外能快速访问校园网络资源,在开源项目OpenVPN的基础上结合数字校园统一身份认证平台设计开发了远程接入系统.系统采用客户机/服务器模式,用户通过客户端软件使用数字校园统一身份认证系统进行认证,与VPN接入服务器建立连接后可快速访问校园网络资源.     

基于OPENVPN的接入系统设计与实现

为方便教职工在校园网外能快速访问校园网络资源,在开源项目OPENVPN的基础上设计开发了远程接入系统.系统采用客户机/服务器模式,用户通过客户端软件使用用户名和密码进行认证,与VPN接入服务器建立连接后可快速访问校园网络资源.     

构建网络化视音频教学服务

利用现有的校园网络资源,系统地讲述了校园视音频网络服务构建原理、软硬件的选用和系统的安装调试,实现网上多媒体教学、远程教育、视频点播、数字广播等视音频服务.     

校园无线网络信息安全综合防御系统研究

在分析校园无线局域网络在大学校园互动教学交流过程中的优越性和必要性后,从校园无线局域网组成结构入手,认真分析了校园无线网络信息安全综合防御体系。构筑完善的校园无线网络信息安全综合防御系统,不仅可以提高校园网络资源的综合利用效率,同时有效提高了校园无线网络数据信息传送和接收的安全可靠性。     

基于校园网内SNMP的UPS远程监控系统设计与实现

介绍利用现有校园网络资源,防止因供电问题引起的校园网络核心设备故障,设计一个基于SNMP的UPS（不间断电源）远程监控系统.该系统已投入使用,监控中心能够远程实时查询UPS的状态信息,出现故障时监控系统能够正常报警.介绍该系统的组成结构和系统功能模块,以及如何利用SNMP协议对UPS上的MIB信息库数据进行获取并转换成直观图形方式显示的方法.     

构建网络化视音频教学服务

利用现有的校园网络资源,系统地讲述了校园视音频网络服务构建原理、软硬件的选用和系统的安装调试,实现网上多媒体教学、远程教育、视频点播、数字广播等视音频服务。     

基于Web的选课系统的开发

叙述了利用校园网络资源进行基于Ｗｅｂ 的选课系统开发的技术要点,介绍了选课系统的功能模块、Ｗｅｂ 数据库的建立及动态交互页面的设计．     

基于网格技术的校园网资源共享平台

校园网络资源的快速增长在校园网内却形成了一个个信息"孤岛",给共享及管理网络资源带来了很大困难;分析了校园网资源使用存在的问题,提出了一种基于网格技术的校园网资源共享平台,它可以实现将校园内空闲、分散、异构计算资源集中起来,供给需要大量计算资源的部门使用;详细介绍了基于网格的校园计算资源共享平台的体系结构,并给出了该系统平台各组成部分的实现方法。     

实验室网络管理平台的构建与应用

论述了充分利用网络资源构建高校实验室管理的新模式.在校园网络基础设施上,设计并建立了一种高校实验室网络管理平台,介绍了该管理平台的系统组成.详细阐述了设备处门户网站、数据处理中心、数据资源中心的功能实现与运行情况,表明通过该网络管理平台的运行,显著提高了实验室管理效率.     

高等院校校园网与信息资源共享的思考

以高等院校内部的校园网络为基点,讨论如何利用已有的网络资源,在高等院校内部实现信息资源共享的基本思路、存在的问题及可行性措施.     

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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