基于OpenFlow的蜜罐主动取证技术

提出了一种方法,将攻击流量自动从真实的云计算服务器中隔离到蜜罐服务器中.通过创建一个蜜罐网络服务器的虚拟机,使蜜罐服务器配备与真实云计算服务器相同的内存和存储设备,并通过OpenFlow控制和监控网络流量,从而将蜜罐系统与真实云服务器隔离开来.当访客正常访问服务器时,交换机会将访客的访问请求路由到真实的服务器.当某个访客被IDS标记为可疑攻击者时,交换机会重新计算路由路径,将攻击者的请求路由到制定的蜜罐中.      

采用OpenFlow交换机的服务器负载均衡策略

云数据中心对服务器的海量并发访问十分普遍.传统网络架构难以全局控制流量转发,需要配置昂贵的负载均衡器应对这一应用场景.软件定义网络SDN(software defined network)能够通过控制器全局掌控网络状态,并以交换机作为负载均衡器,从而降低部署成本.文中提出一种采用OpenFlow交换机的服务器负载均衡策略,通过多地址定向流表对服务请求进行分区映射,以活动连接数作为负载评估参数,通过蚁群算法求解最佳负载重定向方案.在负载迁移时,采用单地址定向流表来保证不同阶段流量的有序转发.实验结果显示,该策略能有效控制流表规模,并较传统均衡策略具有更优的性能.     

数据中心网络技术分析与应用

通过对数据中心传统网络架构所使用技术存在问题的分析,基于目前数据中心日益丰富的服务功能以及其对网络性能的需求,简要分析了目前构建数据中心网络所使用的几种技术,虚拟交换机技术、隧道技术（TRILL、SPB）以及存储网络的FCo E技术,运用虚拟交换机技术、TRILL技术与FCo E技术,设计了新一代数据中心网络架构,并将该架构引入到数据中心网络的实际建设方案当中。     

数据中心网络多路径路由算法

数据中心网络流量分布的不均衡增加了网络拥塞产生的可能性,由于数据中心网络的流量特性,使得传统IP网络的流量工程方法不一定适合。该文在SDN/OF(software defined network/OpenFlow)的结构下,提出了一种基于多路径传输的动态路由算法(dynamic routing algorithm based on multipath propagation,Dramp)并作为SDN/OF结构中应用层的流量均衡策略。该算法在重新定义链路关键度并求解链路权值优化问题的基础上,能充分利用数据中心网络中存在的冗余路径,在完成细粒度流量均衡的同时,能很好地克服控制器的计算开销,完成路由优化的目标。通过在Mininet仿真平台中部署并进行仿真实验,与等开销多路径路由算法ECMP(equal-cost multi-path)以及GFF(global first fit)路由算法相比较,结果展示了Dramp的优越性能,同时证明了在数据中心网络中采用Dramp作为流量工程的解决方案更简单、更实用。     

一种面向数据中心架构的虚拟网络分布式路由技术

在面向企业应用的虚拟网络计算环境中,通常采用数据中心架构来组织分布于局域网的底层物理资源,通过虚拟网络技术将分布在不同宿主机上的虚拟机资源聚合起来,为了提供高效、安全的服务,需要虚拟网络提供高性能数据传输.现有虚拟网络路由技术以及基于IP封装的数据传输技术在数据传输的效率方面难以满足大规模数据需求.针对数据中心的底层架构,本文设计一种高效可靠的虚拟网络解决方案DR-VNET.该方案基于三层虚拟网络,采用虚拟网络的分布式路由技术,使得虚拟传输节点之间实现“单跳”通信,克服传统二层虚拟网络的路由瓶颈问题,提高了虚拟网络的传输效率,并在一个虚拟计算平台上实现了该方案,实验结果表明DR-VNET显著地提高了虚拟网络的传输性能.     

一种具有小世界性常数度的数据中心网

先义了一个常数度代数图Gcoset,在此基础上构造了8度正则度、对称性良好的数据中心网络的虚拟化拓扑结构GDCN;然后详细描述了GDCN的静态模型以及Gcoset的路由算法,并给出了GDCN结构以及一个具体实现;最后将GDCN与其他数据中心网络模型进行了对比.结果表明:GDCN的直径仅为O(log N);Gcoset的路由算法较为简单;GDCN结构简单、通信性能较高,可扩展性良好,且具有良好的路由容错性.     

以太网交换机TRILL协议设计和工程实现

该论文讨论了TRILL协议在以太网交换机上的设计和实现方法.首先简要介绍了数据中心网络的发展和所涉及的技术,并提出了使用TRILL来构建数据中心二层网络.再介绍了TRILL中相关概念、工作原理和优势.提出了交换机上实现TRILL协议功能的模块模型、以及各个模块的实现.该论文的研究为实现数据中心交换机的TRILL功能提供了启发性的解决方案.     

基于果蝇优化算法数据中心网络节能路由机制

提出一种面向通用拓扑、基于果蝇优化算法的动态路由机制来提高数据中心网络的能效.首先,推导出数据中心网络能效模型;然后,设计基于果蝇优化算法的节能路由机制,该机制通过模拟果蝇觅食过程中不断调整优化方向和位置来进行寻路策略,提出决定下一条节点的启发式,最终获得最佳节能路由;在此基础上,提出基于果蝇优化的节能路由算法实现该路由机制;最后,通过仿真实验验证算法的有效性,实验证明本文算法在提高能效的同时,网络性能优于现有算法.     

高校数据中心服务器系统分析

高校数据中心是高校数字化校园中重要的建设内容,数据中心服务器系统是数据中心最重要的硬件基础,其选型直接影响数字化校园各项应用的体系架构.讨论了集群技术、虚拟服务器技术在高校数据中心中的应用,同时比较了小型机及LA架构服务器的优缺点及其在高校数据中心中的应用前景.对高校规划设计数据中心具有一定的指导意义.     

信息技术文摘

Ｗｅｂ变换机为数据中心加速 如果要等待８秒以上才能进入网站或网页,那么将有三分之一的用户因为没有耐心而一走了之。据统计,今年全球团网络延误而损失的网上销售额达到４０亿美元。网络延误等同把客户拒之门外。 虽然网数据中心装满了服务器、路由器及交换机,但是为了满足数据的爆炸性增长,必须使数据中心的Ｗｅｂ交换能力比数据增长快。永远不要让用户等待,这使引出了ｂｅｂ交换机的概念、市场和体会。 用于数据中心的Ｗｅｂ交换机与传统网络设备（如交换机、路由器）有着根本的区别。传统网络设备注重高速完成单个帧和数据包的交…     

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。     

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.     

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.