基于网络入侵检测系统的技术改进

本文从研究入侵检测技术人手，介绍了入侵检测系统的分类；然后分析了基于网络的入侵检测系统（NIDs）的技术方法及其优缺点，指出了当前基于网络的入侵检测系统存在的问题和所面临的挑战．本文在对基于网络的入侵检测系统的研究中，提出将主机知识、网络域知识结合到检测系统中去，解决了检测系统易受插入攻击、躲避攻击的问题．本文还提出了检测子网的概念，根据检测需要将物理子网划分为几个检测子网，可以实现负载的分流和检测任务的专业化分工，负载分流可以彻底解决高速网对网络入侵检测系统的威胁，专业化分工可以大大提高检测引擎的处理速度．     

GSM移动通信系统的网络优化理论与实践

基于陕西移动通信公司GSM移动通信网络，通过研究GSM系统网络优化的理论和技术，提出了几种消除影响GSM网络运行质量因素的解决方法，并应用于陕西移动通信公司GSM网络的实际优化中，取得了较好的效果，提高了系统的接通率，改善了网络服务质量。     

排队论对嵌入式系统网络性能的测试评估

以一个基于嵌入式Internet技术的网络POS机为例介绍了一种评估嵌入式系统网络性能的方法．该方法的具体实现策略是。在一个网络POS机系统(一个以webit为处理器的嵌入式系统)中应用单服务窗等待制M／M／1排队模型测试和评估Webit的网络性能．这些性能包括，Webit在网络上的工作效率、通信质量以及网络拥赛的控制等，从而确保整个系统的稳定性．此方法有助于设计嵌入式信息家电等嵌入式网络产品的编程人员进行调试工作，同时还可用于信息家电性能评估．     

网络控制系统研究进展

对网络控制系统领域的主要研究成果和将来可能遇到的挑战进行阐述。网路控制系统主要分为网络控制、基于网络的控制和多智能体系统3个研究领域。网络控制是针对网络自身的控制,主要是对通信网络的网络路由、网络流量等的调度与控制：基于网络的控制是对被控系统的控制,网络只是作为一种传输通道。研究时考虑网络自身存在的问题对系统的影响．对整个闭环系统进行建模、性能分析以及控制器的设计等;多智能体系统主要是研究网络的拓扑结构和多智能体之间相互作用对整个系统行为的影响。本文主要针对基于网络的控制系统中的时延、丢包、多包传输问题,介绍近年来网络控制系统分析与综合方面的研究成果和最新进展。最后,论述了网络控制系统研究中尚待解决的问题,展望了网络控制系统未来的发展前景。     

基于Proxy的网络机器翻译系统

阐述了基于网络代理的方式在Internet浏览器上实现网页自动翻译的各种解决模式，并给出了系统的网络特性及其实现．介绍了http请求的处理和网页翻译的过程，最后分析了中日互译网页在同一页面显示的内码转换问题．     

基于Intel IXP2350的IP-DSLAM系统的研究与实现

IXP2350是Intel公司推出的新一代网络处理器．具有强大的网络处理性能、高度的可编程性、灵活的网络处理功能。DSLAM是xDSL技术的一种应用最广泛的局端接入设备。提出了一种基于IXP2350的IP—DSLAM的实现方案．系统可连接64路ADSL用户线路，解决了系统局端的接入问题。     

基于Web技术的网络考试系统设计研究

现代远程教育已在电大系统走过近6年的时间,既然是基于互联网上的教育．那考试也应是倾向于基于互联网．本文主要从技术上探讨了机考的一些技术要点及难点．本文讲述了基于Web技术的网络考试系统的设计与实现,描述了网络考试系统的组成与结构,阐述了系统的设计方案、实现方法以及所采用的开发工具和相关技术,还重点剖析了部分环节的程序设计．在具有一套完善的教学平台基础上,我们开始着手于基于计算机的无纸化机考．     

高速以太校园网及网络存储系统的设计与建设

设计了运用高速以太网技术构建的高校宽带多业务网络的平台及基于存储区域网技术的网络存储系统．该网络平台可满足学校对集语音、视频、数据于一体的多业务网络应用需求；基于存储区域网技术的网络存储备份系统可以支持数据中心建设，最终完成大学校园网络和统一软件资源平台的构建，实现统一网络管理、统一软件资源系统．探讨了高校校园网络安全可靠运行的保障手段和简单高效的网络管理方法．并论述了保证端到端服务质量的实施．     

基于MPEG-4网络视频服务器的设计

针对数字网络视频监控系统的需求,研制了一种基于MPEG-4网络视频服务器．使用基于DM642的MPEG-4实时视频压缩卡压缩采集到的音视频数据,利用环形队列实现服务器实时音视频数据的存储,同时运用多线程技术以及传输机制解决网络数据的传输,从而有效克制了画面不清晰、音视频不同步、马赛克等现象,保证客户监看时音视频实时性和同步性．     

基于P4P的MMORPG网络引擎模型研究

C/S构架在MMORPG中使服务器硬件资源和网络用户连接数形成了矛盾。基于P4P的MMORPG网络引擎采用P4P技术实现多层交换的分布式架构模式,很好的解决这一问题。通过对P4P在MMORPG系统中的关键技术研究,给出了基于P4P的MMORPG实现方法。实验表明系统可极大减轻服务器的运算及网络通信量,满足大容量在线要求。     

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.     

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。     

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.