基于DSR路由协议的无线Ad hoc网络实验

针对无线Ad hoc网络中的路由协议问题，介绍了DSR路由协议和改进的DSR路由协议，在。个节点组毒磊实验网上实现DSR和改进后的DSR性能测试，得出了DSR在实际环境中的基本性能，验证了改进后的DSR对原DSR的性能改善。     

Ad Hoc DYMO路由协议性能研究

 讨论了AdHocDYMO路由协议的演进和其路由协议的工作原理,采用ns2仿真实验的方法,对暂停时间变化下的DYMO路由协议和相关的AODV,DSR路由协议进行了平均时延、平均跳数、包传递率和路由负荷分析,结果表明DYMO路由协议在平均时延和平均跳数上性能优于AODV和DSR路由协议,但在包传递率和路由负荷上其性能参数低于AODV和DSR路由协议.     

Adhoc网络中基于信任度的安全路由协议

对Adhoc网络中的DSR路由协议进行改进,提出了一种基于信任机制的安全DSR路由协议（SDSR）．该协议利用节点的信任度来选择安全稳定的路径,限制了恶意节点参与路由建立过程,从而保证了路由传输的安全性和有效性．最后利用NS-2仿真软件对两种协议进行比较,结果表明SDSR协议的分组投递率优于DSR协议．     

认知无线Ad-hoc网络中的按需路由协议

认知无线Ad-hoc网络(CRAHN)近年来受到了广泛的研究,相应的路由协议也随之被提出。在这些协议中按需路由被认为是最具优势的。这主要是由于对AODV路由协议和DSR路由协议的适当改进可以很好的适应CRAHN网络。对一些基于AODV,DSR以及混合型的CRAHN按需路由的改进协议进行了总结,阐述了协议设计的基本原则,对比了不同协议之间的特点和性能。对其优缺点进行了总结和讨论,并分析了未来的研究难点。     

移动Ad Hoc网络中DSR路由协议研究

先阐述了移动Ad Hoc网络中的路由协议分类,并进行了比较。针对按需路由协议中的DSR路由协议阐述其原理,并且分析其特点。然后例举了目前几种基于DSR改进的路由协议。最后利用NS2软件针对DSR协议的数据包的传输率、丢包数、平均延迟进行仿真。     

Linux环境下Ad hoc网络的实现及性能分析

主要提出在Linux操作系统下实现Ad hoc网络的方案.在现有的可以用于Ad hoc网络的路由协议中选择动态源路由（DSR）作为实现协议,建成了由多个节点组成的运行DSR路由协议的试验网,在试验网上对Ad hoc网中的数据传输和语音会议进行了测试.最后对测得的数据进行了分析,并提出了改进方案.     

基于DSR路径请求信息的AODV协议研究

介绍了Adhoc按需距离矢量路由协议（AODV）和动态资源路由预留协议（DSR）的概念．在已有的无线路由AODV协议的基础上，通过利用记录DSR路由请求信息中的跳数等参数信息来对路径选择进行优化，最后确定实际数据传输的路径，通过优化网络路由可以适应拓扑结构的动态变化．并经过对该协议改进前后的某些性能和参数标准进行比较和分析．     

Linux环境下Ad hoc网络的实现及性能分析

主要提出在Linux操作系统下实现Ad hoc网络的方案。在现有的可以用于Ad hoc网络的路由协议中选择动态源路由(DSR)作为实现协议,建成了由多个节点组成的运行DSR路由协议的试验网,在试验网上对Ad hoc网中的数据传输和语音会议进行了测试。最后对测得的数据进行了分析,并提出了改进方案。     

基于OMNeT＋＋的AODV—UU、DSR—UU和DYMOUM路由协议性能仿真与分析

针对被动式单播路由协议AODV—UU、DSR-UU和DYMOUM,使用OMNeT＋＋（Obective Modular Network Testbedin C＋＋）仿真软件,选取分组投递率、平均端到端时延和路由发现频率3个指标对AODV—UU、DSR．UU和DYMOUM路由协议进行了性能仿真,通过改变节点数目和节点移动速度分析比较了这些参数对3个协议性能的影响,仿真结果表明：DYMOUM协议在平均端到端时延和路由发现频率上优于AODV—UU和DSR-UU,但在分组投递率上低于AODV—UU和DSR—UU．最后提出了对DYMOUM协议的改进．     

Ad Hoc网络中的QoS-Aware多目标优化路由协议

对Ad hoc网络中的QoS保证进行研究,针对现有的QoS路由协议没有考虑节点负荷、节点碰撞等本地信息,提出了一个在Ad hoc网络中提供QoS的路由协议——QoS-Aware多目标优化路由协议(QMOR).该协议把QoS请求———带宽作为接入控制的参数,路由发现和路由维护算法是DSR协议的扩展,在目的节点利用多目标优化算法进行选路,算法的优化参数包括路径时延、缓冲区中已存包的长度和重传数目.通过仿真,结果显示了QMOR协议无论在静态网络和动态网络,都有比DSR协议更好的性能.     

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