校园网访客管理策略与实现

随着高校国内国际交流活动的增加和校园网建设的发展,尤其是无线网络服务的推广,越来越多的访客要求接入校园网络、使用校内外网络信息资源.介绍了复旦大学根据校园网访客管理方案设计实现的辅助管理系统,该系统与IT服务管理相结合、实行了访客自助化管理模式.     

基于微信公众平台的无线网访客认证管理服务系统

随着移动互联网的兴起,大规模开放无线网络中,访客的快速认证是近年来的研究热点。该文基于微信公众平台实现无线网访客的认证,通过配置无线网控制器允许访问微信公众平台的相关数据包,访客只需关注公众账号,即可在公众平台实现身份认证、获取默认权限、访问网络资源;然后利用公众平台与无线网控制器的联动,对访客进行角色、策略和行为审计等管理功能;最后拓展微信公众平台为访客提供无缝的服务功能。本系统具有配置简便灵活、用户体验良好、后期管理和服务方便等优点,适于大规模高校或商场等无线网络场景中实现访客的快速认证、可控管理及友好服务。     

在.Net平台下域名管理系统的设计与实现

域名服务作为校园网的基础服务之一,其更新和维护占用了系统管理员大量的时间和精力.我们在分析高校校园网域名管理需求的基础上,设计并实现了.Net平台下的基于Bind-Mysql的域名管理系统.本系统具有以下特点:/S结构,域名申请实名制,分级管理,实时开通,实时备份.有效地避免了域名的冲突、重复申请等问题的出现.本系统与IP地址自助管理系统、服务器端口控制与映射系统联合使用,能够有效的管理校园网内部的大量服务器,最大地简化了服务器的开通申请、服务变更等手续,并且在发生问题的时候能够快速地排除故障.     

动态域名解析在校园网中的应用

在分析了传统的校园网出口存在的瓶颈问题后,介绍了利用动态域名解析服务,解决非教育网用户访问校园网内地址服务器的网间互联瓶颈问题的方法.     

在.Net平台下域名管理系统的设计与实现

域名服务作为校园网的基础服务之一,其更新和维护占用了系统管理员大量的时间和精力.我们在分析高校校园网域名管理需求的基础上,设计并实现了.Net平台下的基于Bind-Mysql的域名管理系统.本系统具有以下特点：B/S结构,域名申请实名制,分级管理,实时开通,实时备份.有效地避免了域名的冲突、重复申请等问题的出现.本系统与IP地址自助管理系统、服务器端口控制与映射系统联合使用,能够有效的管理校园网内部的大量服务器,最大地简化了服务器的开通申请、服务变更等手续,并且在发生问题的时候能够快速地排除故障.     

基于Hadoop的校园网站日志系统的设计与实现

每所高校校园网内成百上千的网站每天产生的Web访问日志量级都以千万计.利用大数据技术对这些海量、实时的数据进行集中搜集和长期存储,并通过后期大数据分析来挖掘这些日志的价值,无论从管理运维角度,还是从信息安全视角都具有实际意义.本文以上海交通大学为例,介绍了利用Hadoop大数据平台,存储并分析校园网内数千网站日志的系统设计和实现.     

基于端口与网关的校园网认证计费设计与实现

针对校园网需求,提出了基于端口和网关结合的校园网认证计费解决方案,以加强对校园网用户管理,提高校园网安全,有效地对学生用户访问校内外资源进行控制与合理计费.最后介绍了基于该方案的校园网认证计费系统实现情况.     

高校校园网统一身份认证系统的安全研究——以山西大学商务学院校园网为例

网络身份认证技术的逐渐成熟,为高校校园网实现统一身份认证技术和"一卡通"系统提供了网络基础.校园网的应用现状对身份认证系统提出了现实需求.本文将通过介绍山西大学商务学院校园网建设的总体设计思想与功能,针对校园网内用户访问量大且多数用户访问权限有限,以及身份认证系统在实施过程中存在的问题,提出基于802.1x的统一身份认证系统的安全管理方案.     

用VPN技术实现用户远程访问校园网资源

VPN技术是一种新兴的网络技术,它是一个建立在现有共用网络基础上的虚拟专用网.IPSec VPN和SSL VPN是目前应用中使用较多的VPN技术.随着高校校园网可供师生访问的资源日渐增多,由于知识产权和版权等因素使得相当部分电子资源只能在校园网内部访问,不能对外网开放,校外居住的师生访问不了校园网内部资源.采用VPN技术可以实现校外师生远程访问校园网内部资源.本文根据VPN技术的不同特点和校园网应用的实际需要,探讨采用SSL VPN技术实现用户远程访问校园网资源.     

基于Linux服务器双出口方案的研究与实现

目前教育网日益发展,校园网建设也越来越普及,校园网用户访问公众网采用双出口技术日臻成熟,基本解决了访问公众网资源慢的问题,但公众网访问校园网资源慢的问题还比较突出,原因是服务器没有实现双出口技术.本文研究了目前较流行的服务器双出口方案的实现,指出了它们的优缺点,详细讨论了基于Linux服务器双出口的实现,并给出了实例,结果证明,系统运行稳定,性能会更加优良.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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