EPON中支持多种业务的带宽调度方案

提出了一个在EPON上实现多种业务传输的带宽调度方案，借鉴了区分服务的方法，将服务分级并相应地将EPON的上行带宽分为预留带宽、高优先级和低优先级带宽，并采用了不同的分配策略，仿真分析证明，该调度方案能够很好地支持实时性业务和具有高突发性的数据业务。     

一种基于业务流带宽约束的前向资源预留策略

在OBS网络中，与传输路径建立时间相比，入口节点处的数据突发处理时间是影响数据突发端到端时延 的主要因素。为了减少入口节点处的数据突发时延，提出了一种基于业务流带宽约束的前向资源预留（FRR-BC） 策略。该策略使用一种新的基于业务流带宽约束的数据突发长度预测方法，以降低数据突发在入口节点处的处理 时间，同时通过业务流的带宽约束来限制数据突发的最大长度，以提高前向资源预留策略的性能。理论分析表明， 该策略使数据突发时延达到FRR的最小值。     

一种非均匀包对序列带宽测量方法

在分析现行带宽测量算法的基础上，设计了一种新的包对带宽测量算法，并从理论上加以证明，针对带宽测量中普遍出现的瓶颈拥塞现象，提出了一种非均匀包对序列带宽测量方法，首先设置基本的包对发送后退时间，再根据带宽估测结果的变化动态地调整后退时间，使得包对序列能有效地适应网络运行状态的变化，所得到的估测序列结果更接近实际的瓶颈带宽，其具体实施验证了它的有效性。     

QoS策略控制的研究与解决方案

随着因特网用户的迅速增加和Web的广泛应用，目前的网络技术面临很大的挑战，越来越多的多媒体业务吞噬掉大量的带宽，造成了网络的拥塞，于量，人们使用QoS来有效地利用带宽，保证紧急业务数据的传输。文中介绍了QoS的协议和基本组成部件，并在此基础上，提出了QoS策略控制的概念以及基本思想，着重分析了QoS策略控制的结构模型以及各个组成部分之间的运作方式，最后介绍了在QoS策略控制系统中，数据包在策略的控制下传输的过程，以及在现实的环境中，策略的制定方案。     

一种记忆性移动定位管理策略及其性能分析

针对当前的定位管理策略消耗大量无线带宽资源的缺点，提出了一种基于记忆性的智能定位管理策略，比较了顺序寻呼和并行寻呼两种方法对策略性能的影响。由于寻呼开销和寻呼延迟之间存在折中关系，在执行 该定位管理策略时，系统可以根据用户的移动预测水平和对服务质量的要求灵活选择不同的寻呼方法，从而提高系统资源利用率和服务质量。理论分析和数值计算结果均表明，在液体流动运动模型下，该策略比传统定位策略节省了大量的无线带宽资源。     

多P2P覆盖网络的带宽分配方法

针对多频道对等(P2P)视频直播系统中会出现多个P2P覆盖网络竞争节点带宽资源的问题,提出一种基于多P2P覆盖网络的带宽分配方法.按照不同的观看频道集合并根据需求为各个节点组提供参与频道中的带宽分配策略;以分组带宽分配策略为基础构建和维护与带宽分配相适应的节点伙伴关系和网络拓扑结构;P2P节点数据请求的响应策略在相应的伙伴节点中选择服从带宽分配策略的候选伙伴节点来传输数据,通过节点响应行为完成带宽分配.实验结果表明,所提方法能够使系统的可用带宽在不同频道中按照需求比例进行分配,与随机策略相比可以减少带宽不足频道的数据平均到达时间,加快用户的平均下载速度.     

一种IEEE 802.11 无线局域网的上下行带宽分配策略

针对IEEE 802.11基础架构网络中上下行带宽分配不公平的问题,提出了一种新的基于概率发送机制的上下行带宽分配策略,通过调节分组传输概率改变接入点(AP)或终端的接入概率,从而实现上下行带宽的公平分配.文中推导了公平带宽分配的最优发送概率与下行流数的关系,作为在AP或终端进行带宽分配的依据.仿真结果表明,文中策略能够提供准确的上下行带宽分配.     

iRGRR算法分组调度中带宽利用率分析及改进策略

为消除变长长度分组和信元长度对算法性能的影响,提高带宽利用率,以iRGRR算法为例,分析了在分组调度中带宽利用率等性能,并提出了一种简单、硬件易实现的改进策略。仿真结果表明,iRGRR算法使用该策略后,不仅提高了带宽利用率,而且消除了分组变长长度对算法性能的影响。给出了该策略的实现方案。     

P2P视频点播系统中数据缓冲策略的优化

在网络视频系统中,服务器带宽成为了制约系统规模增长的重要瓶颈,而视频点播系统的交互性又对服务器带宽提出了更高的要求。为更好地支持大规模视频点播,该文对一类P2P视频点播系统的可扩展性进行了定量分析,指出可以通过优化客户端的数据缓冲策略来更好地利用客户端的存储和带宽资源,从而降低服务器的带宽占用。该文提出了一种最优缓冲策略,并通过分析和仿真实验证明,在特定的情形下,仅通过优化节点的传输策略,即可节约服务器20%以上的带宽,从而大大提高了P2P视频点播系统的可扩展性。     

P2P视频点播系统中数据缓冲策略的优化

在网络视频系统中,服务器带宽成为了制约系统规模增长的重要瓶颈,而视频点播系统的交互性又对服务器带宽提出了更高的要求。为更好的支持大规模视频点播,该文对一类P2P视频点播系统的可扩展性进行了定量分析,指出可以通过优化客户端的数据缓冲策略来更好地利用客户端的存储和带宽资源,从而降低服务器的带宽占用。该文提出了一种最优缓冲策略,并通过分析和仿真实验证明,在特定的情形下,仅通过优化节点的传输策略,即可节约服务器20%以上的带宽,从而大大提高了P2P视频点播系统的可扩展性。     

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.     

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.