无线局域网中移动IPv6的实施

移动IPv6允许用户在移动的过程中保持连续的通信.为研究移动IPv6机制的可行性,按照802.11无线局域网标准搭建了移动IPv6实验网络并进行了切换性能测试与分析,实验结果表明标准移动IPv6引入的信号负载不会影响网络性能,网络中UDP应用性能要优于TCP应用性能.     

层次移动IPv6域内切换与实现

针对移动主机在外地网络中频繁的域内切换的性能问题,提出了移动IPv6的层次型管理的切换模型并给予实现.层次移动IPv6采用移动锚点,可以减少移动主机同本地域以外节点的信令交互,并对层次移动IPv6域内切换的原理进行了研究;组建了层次移动IPv6实验床和物理网络拓扑结构与之相似的移动IPv6实验床,对比移动IPv6的切换机制对层次移动IPv6的域内切换机制进行测试、分析,结果表明层次移动IPv6能够显著提高域内切换的性能.     

IPSec策略在移动IPv6网络中的研究与实现

对IPSec在移动IPv6网络中的应用进行了实验研究.介绍了移动IPv6和IPSec协议的工作原理,并在学校的移动IPv6实验网络中进行了成功配置.从可行性及安全性的角度对实验结果进行了验证,为该技术的进一步研究打下了基础.     

基于IPv6存储集群网络模块的设计及应用研究简

随着我国网络技术的快速发展,基于核心IPv6(HMIPv6,接入认证是层次型移动)技术设计构建IPv6存储集群网络模块,可以提高网络的整体吞吐量,提升IPv6存储集群网络服务质量,提高网络模块的安全性.实验结果表明:基于IPv6技术设计应用IPv6存储集群网络模块,不仅可以提升网络安全性(提升12%),也可以提高网络模块服务性能(提高20%),满足当前对网络模块设计应用的多样化信息服务需求.该设计基于IPv6存储集群网络模块,能满足网络模块客户需求,提升网络安全性能与服务性能,在实际应用中发挥积极影响.     

802.11网络中移动IPv6快速切换的设计与实现

移动IPv6虽然解决了网络层的移动性问题,但是其切换性能并不乐观。为了适应实时应用的需求,IETF提出了移动IPv6快速切换协议以减少移动IPv6的切换时延。通过研究802.11的切换过程和移动IPv6快速切换协议,本文设计并实现了一种在802.11网络中移动IPv6快速切换方案。     

基于IPv6存储集群网络模块的设计及应用研究

随着我国网络技术的快速发展,基于核心IPv6(HMIPv6,接入认证是层次型移动)技术设计构建IPv6存储集群网络模块,可以提高网络的整体吞吐量,提升IPv6存储集群网络服务质量,提高网络模块的安全性.实验结果表明:基于IPv6技术设计应用IPv6存储集群网络模块,不仅可以提升网络安全性(提升12%),也可以提高网络模块服务性能(提高20%),满足当前对网络模块设计应用的多样化信息服务需求.该设计基于IPv6存储集群网络模块,能满足网络模块客户需求,提升网络安全性能与服务性能,在实际应用中发挥积极影响.     

嵌入式移动IPv6协议栈的设计

下一代网络协议标准是IPv6,为了实现嵌入式设备在IPv6网络中的移动性和不间断通信,设计一种精简的移动IPv6协议栈具有重要意义. 根据国际标准化组织IETF制定的移动IPv6协议的标准RFC 3775,结合嵌入式设备自身的特点,采用模块化思想和精简功能的方法对协议栈进行了设计. 协议栈的整体设计方案符合移动IPv6规范,满足嵌入式设备的性能要求.     

IPv6的安全探讨及在移动环境中的应用

IPv6作为下一代互联网的必行标准，1994年被IETF（互联网工程任务组）最先提出来，并同时由它负责指定和完善。中国被认为是IPv6最有需求和发展环境的国家。IPv6的应用和普及离不开强腱的安全体系支持，然而虽然当前的IPv6基于IPSec较好地实现了网络层的安全，但对于整个IPv6网络而言，现行的IPv6安全方案还有一定的缺陷。本义分析了IPv6的安全特性和基于IPv6安全特性的应用，总结了当前IPv6网络中的一些安全隐患并提出解决的设想。基于移动IPv6在IPv6应用中的重要地位，本文最后还分析了移动IPv6的安全需求并提出解决安全问题的方案。     

淘汰策略对移动IPv6协议的改进

由于传统移动IPv6协议要求家乡地址和家乡代理永远固定不变,当移动节点长期远离家乡网络时,其他主机与移动节点之间的通信需要转交地址的绑定更新信息,这会在网络中产生大量的注册报文,降低网络性能.针对传统移动IPv6协议这一缺点,提出了新的移动IPv6协议,新协议采用区域累计使用时间来确定家乡地址、家乡代理,在技术上使用动...     

基于亲密伙伴安全通信方案的移动扩展研究

在对原有亲密伙伴安全通信方案及IPSec协议深入研究的基础上,结合移动IPv6网络中移动节点的特性,提出了一种基于移动IPv6网络的安全通信扩展方案.通过使用IKE移动性支持协议 (Mobile IKE,MOBIKE) 、在移动网络中构造动态分布式管理节点,解决了原方案不能直接运用于移动网络以及网络带宽利用率低的问题,使IPSec策略在移动IPv6网络中得到了灵活的应用.最后,通过对新方案进行仿真和分析证明了该方案的可行性.     

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.     

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