一种基于QoS的星座通信系统跨层资源分配算法

针对目前星座通信系统星地链路资源分配不灵活、缺乏有效服务质量(QoS)保障机制等问题,提出一种基于QoS的星座通信系统跨层资源分配算法.利用自适应编码调制(ACM)技术,通过定义用户信道质量评估算法、可调公平性调度算法、业务QoS分类调度算法及用户业务分配权重函数,为终端用户指定工作频率、时隙、编码方式、调制方式等物理层工作参数,实现根据业务QoS保障要求灵活分配物理层信道资源,达到提高系统资源利用率与满足业务QoS保障需求的平衡.仿真实例验证该算法可以实现星座通信系统根据业务QoS和用户信道质量对星地链路资源的合理分配和调度.     

面向实时业务的快速公平性分组调度算法

长期演进系统(long term evolution,LTE)中的分组调度算法需要满足一定的QoS.针对最大权值时廷优先算法(modified large weighted delay first,M-LWDF)在用户公平性方面的缺陷,提出了基于线性优先级和非线性优先级的M-LWDF算法,以达到提升用户公平性的目的.仿真结果表明,所提出的算法能够在牺牲少量系统吞吐量的情况下,较大程度地改善用户公平性和业务的丢包率.     

机会波束成形系统中一种新的调度方案

主要研究机会波束成形系统中的调度算法,将宽带无线IP网络调度算法应用于机会波束成形系统,提出了一个保证用户QoS要求的新方案.数值分析表明,所提的方案较之传统的方案在保证系统吞吐量和用户间公平性的同时.也保证了用户的QoS.     

合理反馈机制下保证混合业务QoS的调度算法

针对正交频分复用(orthogonal frequency division multiplexing, OFDM)系统多用户中继场景中混合业务对时延的不同需求,提出一种基于合理反馈机制下的降低时延、保证混合业务服务质量的调度算法(mixed services with feedback scheduling , MSFS)。MSFS算法针对用户实时业务及非实时业务的不同需求分别采用不同的调度准则及反馈方式,以达到优化系统性能的目的。针对实时业务,增大其调度优先级以减少等待时延,并在其等待时延接近时延门限时,使其调度优先级迅速增加,以避免丢包;针对非实时业务,加入时延公平因子,使得该类用户业务在时延公平性方面得到改善,同时设置适当的反馈门限,在不影响业务服务质量需求的同时达到降低系统反馈量的目的。仿真结果表明,该算法在保证系统吞吐量和用户公平性的同时,不仅能够有效降低实时用户的时延,而且能够较大程度地减少系统反馈量。     

TDD—OFDMA蜂窝网络中基于QoS的下行调度算法

TDD-OFDMA蜂窝网络中,在三扇区单频小区和三扇区多频小区两种模式下,分析了RR,maxC/I,PF和DPF四种调度算法的系统吞吐量和用户公平性,其中DPF算法是一种基于QoS的下行调度算法。调度算法和频率复用方案的选择需要根据系统吞吐量和用户公平性来权衡。     

LTE网络考虑机会调度与QoS保障的准入控制算法

研究了长期演进(long term evolution,LTE)网络中考虑机会调度并可提供不同服务质量(QoS)保障的准入控制(CAC)算法的设计.使用基于累积分布函数的调度(cumulative distributed function based scheduling,CS)作为基本调度策略.首先采用机会轮询(opportunistic roundrobin,ORR)计算CS性能下界,并通过仿真验证此计算方法的正确性.然后提出一个CS与ORR相结合的CAC算法COCDQ(CS/ORR based CAC algorithm for different QoS requirements),其可同时保障新接入用户和已存在用户的不同QoS需求.最后通过系统级仿真验证所提算法性能,结果表明联合考虑机会调度与QoS需求,COCDQ算法可有效降低新接入用户阻塞率,提供更好的QoS保障,其代价是仅总吞吐量略有降低.     

一种适用于B3G OFDM系统的下行无线分组调度算法

针对OFDM系统下行链路,无线分组调度须实现系统吞吐量、多业务QoS带宽速率、时延保证和公平性方面的诸多要求,提出一种能够实现自适应补偿的累积服务时延比例公平调度(DCPF)算法.该算法根据信道状态、累积服务时延等进行多目标判决,实施无线分组调度.分析和仿真结果表明,该算法可提供较好的QoS时延保证,并极大地提高各用户长期公平性.     

一种基于QoS的无线分组调度算法

提出了一种适用于无线网络的分组调度算法动态概率优先级(DynamicProbabilistic Priority,DPP)调度算法.DPP调度算法采用动态的优先级分配策略,满足了不同业务的QoS需求.另外,DPP算法在网络出现差错时,动态地调整带宽分配,使得网络中的带宽得到有效的利用,提高了系统的吞吐量,保证了算法的公平性.理论分析和仿真试验表明,在无线网络环境中,该算法具有更好的性能.     

一种支持实时多媒体业务的LTE无线资源调度算法

针对现有LTE下行传输调度未能保证实时多媒体业务服务质量(Quality of Service,QoS)的问题,提出一种改进的支持实时多媒体业务QoS的两层调度方案.该方案的上层根据实时业务时延门限要求从无线帧的角度采用改进算法计算每帧的数据包调度量,下层在保证实时业务QoS的基础上以提高非实时业务吞吐量为目标为混合业务分配无线资源.最后与现有经典调度算法仿真比较,结果表明该算法获得最低的实时业务丢包率,有效保障了实时业务的QoS,同时获得较高的非实时业务吞吐量.     

OFDMA下行链路混合业务调度算法

提出了一种基于正交频分多址接入系统的混合业务分组调度算法.在调度过程中,对信道状况好的实时业务用户的数据包采用推迟发送的策略.先对缓冲区中累积数据包较多的实时业务用户分配资源,随后对非实时业务用户采用正比公平算法分配剩余的资源.仿真结果表明,提出的算法较好地满足了实时业务的延迟需求,并提高了非实时业务的系统吞吐量.     

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.     

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.     

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.     

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.     

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.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.