Ad hoc网络中骨干网的建立和维护

Ad hoc网络中的移动骨干网的建立和维护是一项复杂的工作。比较了2种不同类型的骨干网络，说明了移动骨干网络的构造目标，重点对Ad hoc网络中移动骨干网的建立和维护过程进行了阐述和分析，最后介绍了其他相关工作并指出MBN的构造目标。     

移动Adhoc网络的体系结构和分簇算法

Ad hoc网络是一种多跳移动自组织网络,它需要特殊的体系结构来支持路由、管理和其他网络功能.首先介绍了Ad hoc网络的一些显著特点,然后详细分析了Ad hoc网络的体系结构.接着介绍了一种性能较好的分簇算法并讨论了簇维护机制和码字分配等问题.     

Ad hoc网络接入技术的研究

Ad hoc网络通常是以一个独立的通信网络形式存在的,但为了满足Ad hoc网络实际应用中移动终端访问有线网络资源的需要,就必须实现Ad hoc网络与其它网络的互连。通过对当前Ad hoc网络互连的几种形式及其技术的研究,针对Ad hoc网络的特点详细对基于移动IP原理的接入技术进行了研究。该技术能够实现Ad hoc网络中移动主机的无缝切换,具有安全、稳定的特点,是一种较好的Ad hoc网络接入技术。     

Ad hoc网络接入技术的研究

Ad hoc网络通常是以一个独立的通信网络形式存在的,但为了满足Ad hoc网络实际应用中移动终端访问有线网络资源的需要,就必须实现Ad hoc网络与其它网络的互连.通过对当前Ad hoc网络互连的几种形式及其技术的研究,针对Ad hoc网络的特点详细对基于移动IP原理的接入技术进行了研究.该技术能够实现Ad hoc网络中移动主机的无缝切换,具有安全、稳定的特点,是一种较好的Ad hoc网络接入技术.     

基于移动Ad hoc网络的分簇算法分析

Ad hoc网络是一种多跳移动自组织网络,它需要特殊的体系结构来支持路由、管理和其他网络功能。详细剖析了Ad hoc网络的体系结构及其特点,然后研究了一种性能较好的分簇算法,并讨论了簇维护机制和码字分配等问题。     

一种基于移动代理的Ad hoc无线网络路由方法

Ad hoc无线网络是一组具有路由和转发功能的移动节点组成的一个多跳的临时性自治系统,是一种无中心的无线网络。现有的主动路由协议或者按需路由协议都不能很好的满足Ad hoc网络的需要。文中首先介绍了Ad hoc无线移动网络和移动代理技术,接着在分析两种按需路由协议中加入移动代理的技术的基础上,作者提出了综合两种技术的新方法,即基于移动代理的路由方案,以达到既节省网络路由建立所耗费的资源,又缩短路由建立时间的目的。最后给出了仿真的结果和下一步的工作。     

移动Ad hoc网络中的一种信任评估模型

为了实现从安全管理的角度划分移动Ad hoc网络的网络结构,保证移动Ad hoc网络的有效运行和管理,提出了一种信任评估模型.该模型从信任的定义出发,采用实体行为的服务级管理,针对不同类别服务的实体行为表现成功次数和失败次数对信任关系进行度量,定义了直接信任度、推荐信任度和节点信任度.结果表明该模型适用于移动Ad hoc网络,弥补了移动Ad hoc网络中现有的成簇算法缺少恶意节点检测的缺陷.     

浅淅Ad hoc网络常见移动模型仿真图形界面设计

网络又称为多跳无线网络或者自组织网络。由于其广泛的应用前景,且基于Ad hoc的系统性能分析和协议行为设计逐渐成为研究的主流。现有的研究中,对节点的移动性主要通过移动模型来描述,本论文通过价绍Ad hoc网络常见移动模型浅淅了Ad hoc网络常见移动模型仿真图形界面与子窗口功能设计。     

一种基于最小费用最大流理论的Ad hoc路由协议

针对Ad hoc网络QoS路由问题,提出了一种基于最小费用最大流理论的Ad hoc路由协议(MCMFP)。将Ad hoc的移动终端作为网络节点,通信链路作为相邻节点之间的边,建立了Ad hoc网络的网络流模型,使Ad hoc网络的路由计算问题转化为图论中的最小费用最大流问题,从而计算出满足多QoS约束的路由路径,优化了网络带宽的使用,提高了通信信道的利用率,实现了网络流量的负载均衡。仿真结果表明,MCMFP协议具有更高的包转发率和更小的平均时延,有效提高了Adhoc网络的QoS性能。     

Ad hoc 网络的入侵检测技术

随着无线网络的发展和移动计算应用的快速增加,网络安全问题愈加突出,入侵检测已经从保护固定有线网络扩展到移动无线网络．作为无线移动网络众多实现方式之一的移动Ad hoc网络,由于其与有线网络存在很大差别,现有针对有线网络开发的入侵检测系统很难适用于移动Ad hoc网络．在描述入侵检测技术的相关内容基础上,提出了基于移动Ad hoc网络的多层分布式入侵检测系统模型,并重点分析了在该模型中的协议分析技术．     

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