LDAP在大容量电子邮局中的应用研究

轻量级目录访问协议LDAP是在简化X.500协议的基础上提出的，它运行于TCP／IP之上，可以用来提供独立的分布式目录服务或对X．500目录进行轻便访问。作者在简要介绍了LDAP的基本模型和功能后，对它在大容量电子邮局中的应用进行了研究，并给出了应用系统中主要环境变量的配置方法。     

基于LDAP的统一身份认证系统的实现

结合兰州理工大学“基于LDAP的统一身份认证系统”的实例介绍了基于LDAP的统一身份认证系统的完整实现过程．系统采用LDAP（lightweight directory access protocol,轻量级目录访问协议）存储用户认证信息,可以构建复杂的分布式目录结构．在LDAP存储模型的基础上,系统实现了统一的用户认证信息管理系统,可以通过统一的界面和逻辑对用户认证信息进行集中管理．     

使用LDAP开发轻型目录数据库

LDAP是基于客户-服务器模型的轻量级目录访问协议,它能为X.500目录或其它独立服务提供轻量级的访问,从而获得高性能的目录数据库。本文首先简要分析了LDAP协议的模式、结构,然后介绍了LDAP的主要开发接口,并提供了一个实例以方便开发者掌握其应用模式。     

基于LDAP的广域网存储虚拟化目录管理

研究了广域网范围内的存储虚拟化目录管理．采用基于轻量级目录访问协议(LDAP)目录管理方案管理现有的存储资源,按目录树型结构组织用户的存储资源分布信息,提供基于多用户的存储目录视图,实现用户对资源的透明使用。     

轻量级目录访问协议分析与安全检测

轻量级目录访问协议(LDAP)是一种新兴的目录标准,它在网络迅速发展的今天已被越来越多的部门所使用,因此它的安全问题成为网络研究的焦点.文章介绍了LDAP协议的基本概念和特点,分析了LDAP协议数据单元的编码规则,在此基础上编制了安全探测软件,最终达到了安全检测的目的.     

基于LDAP的ERP系统安全机制研究与应用

在分析了ERP系统的安全机制的基j咄上，探讨了ERP系统的安全方案并着重论述了轻量级目录访问协议(LDAP)及其应用的优点，最后论述了这些方案在实际ERP系统中的应用。     

轻型目录访问协议在网络管理中的应用研究

以网络管理模型为基础,分析了基于关系数据库的数据存储方式难以适应异构网络环境的原因,同时提出了一种新的基于轻型目录访问协议（LDAP）的管理框架,该框架利用标准目录技术存储和访问网管数据,并通过LDAP对外提供统一的公共访问接口,这不仅可以满足异构网络环境的开放要求,而且能够在可靠性、访问速度以及管理集成等方面极大地提高网络管理的质量。     

异构认证系统间身份同步的设计与实现

随着学校信息化建设的深入发展,统一身份认证系统应用范围越加广泛,压力也随之增长.为了进一步加强系统的兼容性和可靠性,复旦大学在已有轻量目录访问协议(LDAP)认证集群的基础上,新增了活动目录(AD)认证集群.为了保证异构认证系统间身份的一致性,设计并实现了LDAP和AD之间身份信息同步.     

基于LDAP的网格监控模型研究

对于高性能分布式计算环境——网格来说,监控其中每个计算节点的状态是至关重要的。首先介绍网格环境下系统监控的特点及轻量级目录访问协议——LDAP,然后介绍网格环境下的基于LDAP的系统监控模型,最后对该模型做出客观的评价,并提出一些新设想。     

基于LDAP的统一身份认证管理系统的设计与实现

文章介绍了一个支持用户单点登录的统一访问控制系统,系统基于LDAP目录服务,它将各种应用系统的身份认证结合在一起,实现了用户统一管理的安全访问。系统采用优化技术,有效的解决了大量用户访问LDAP时的瓶颈问题。     

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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