基于Delaunay拓扑的无线Mesh骨干网部署研究

研究了无线Mesh骨干网部署优化问题,结合网络的拓扑结构及定向天线技术的传输特点对无线Mesh骨干网进行优化部署,提出一种基于Delaunay图形的无线Mesh骨干网部署优化算法,较好地解决了WMN骨干网信号干扰问题。     

基于链路干扰模型的802.11s信道分配策略

从无线链路干扰的角度为802.11s定义的无线Mesh网络提出一种信道分配策略.首先在现有无线干扰模型和传播模型的基础上,通过仿真研究无线干扰对无线Mesh网络性能的影响;然后根据仿真结论提出无线链路干扰模型,同时利用无线Mesh网络流量呈现树状拓扑汇聚的特点对网络拓扑进行有序分解,从而划分出多跳链路干扰和单跳并行链路干扰;最后提出的802.11s信道分配策略的基本思想是采用循环交叉分配信道的方法尽量减少或消除无线多跳链路干扰.     

无线Mesh网络中安全路由协议的研究

无线Mesh网作为一种新型的无线通信网络,能在更大的覆盖范围内提供高的速率.本文旨在提出一种高效、安全的Mesh网路由机制,保证网络正常工作.首先介绍其安全需求,随后分析了一种无线Ad hoc网络中的ARAN鉴别路由协议,最后提出了一种全新的基于ARAN协议鉴别思想并且适用于无线Mesh网络的ARWMN安全路由协议,并对其安全性能进行了分析,其安全性与收敛速度能较好地满足网络需求.     

无线网状网域间无缝切换技术研究与设计

针对无线Mesh网络缺乏对域间移动切换支持的问题,提出了一种高效的无线Mesh网络域间无缝切换技术,降低切换时延,实现无线Mesh网络域间的无缝切换.通过对STA物理地址与IP地址的绑定,设计地址对应关系表和路由算法,并在源MAP与目标MAP建立缓存机制,保存切换过程中的通信数据包,实现在无线Mesh网络域间的有效切换.通过网络设备的缓存策略与新的算法寻址机制,减少STA在切换过程中的压力,有效降低了切换过程的丢包率,实现Mesh网络域间的无感知与快速切换.     

无线Mesh网络中基于链路状态的RED算法研究

针对无线Mesh网络的特性,分析了随机早期检测(random early detection,RED)算法的实现过程,提出了一种基于链路状态的RED(link-states-based RED,LS-RED)算法。该算法的基本思想是通过移动节点的链路状态信息动态调整RED算法中的4个参数。详细讨论了LS-RED算法的实现过程,提供了无线网络下LS-RED算法参数的设置方法,并对该算法实现过程进行了分析,通过仿真分析验证了该算法对无线Mesh网络性能提高的有效性。     

基于纳什均衡解的无线Mesh网络资源分配算法研究

针对无线Mesh网络因存在大量竞争节点导致网络资源利用率降低的问题,从最大化网络性能为目标,建立一个反映无线Mesh网络节点间竞争资源过程的非合作动态博弈模型,并在此模型基础上提出一种基于纳什均衡解的无线Mesh网络资源分配算法。算法通过求解求解博弈的纳什均衡解来获得各类业务的最优发送概率,使各类业务获得了最优的发送机会。通过优化数据发送行为,减小了节点间竞争的碰撞概率,降低了不必要的退避时间,进而提高了网络资源的利用率。仿真实验结果说明了算法的可行性和有效性。     

基于纳什议价解的IEEE 802.16网络流量控制方法

基于纳什议价合作博弈论,针对IEEE 802. 16无线Mesh网络中不同信道情况下的流量控制问题,提出了一种最大化网络整体效用的流量控制方法.该方法以IEEE 802. 16无线Mesh网络端到端的业务流为研究对象,基于纳什议价解(NBS)框架,结合自适应调制编码技术,设计了一种节点速率优化控制机制.实验结果表明,所提方法能兼顾用户的收益和公平性,并能最大化网络的整体效用.     

基于WMN技术的校园无线网络建设

为了满足当今学校对无线网络的迫切需求和其自身的基本特点,本文从简要介绍无线Mesh网络概念入手,分析无线Mesh网络所具备的特点,根据现代校园的无线网络特征,提出了一种基于WMN技术的校园无线网络结构设计方法和框架。该方法和框架具有高速、便捷、可靠以及大容量等特征,能为今后校园无线网络建设提供有力的支持。     

无线Mesh网络中基于信道状态的动态信道分配算法研究

对多信道无线Mesh网络中的信道分配算法进行了分析,提出了一种基于信道状态的动态信道分配策略（channel-state-based dynamic channel assignment,CSDCA）。该算法利用控制信道交互的信息,通过Hello消息的交换、发送请求（request-to-send,RTS）和允许发送（clear-to-send,CTS）的信道协商、数据传输3个阶段实现信道的动态分配,并通过仿真分析验证了该算法对多信道无线Mesh网络（multichannel wireless mesh networks,MWMN）性能的提高。     

基于双链路的无线Mesh网络骨干链路性能优化研究

骨干链路传输带宽是多跳无线Mesh网络性能的主要瓶颈之一.基于Linux 开源代码构建无线Mesh网络实验床,分别在IXP425和x86平台下采用成熟的IEEE 802.11a无线横块对无线Mesh网络骨干链路性能进行了一系列实验研究.实验结果表明,采用双链路的无线Mesh网络骨干链路可以达到100 Mb/s级别的传输带宽,将有效提升了多跳无线Mesh网络的应用前景能.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.