分布式入侵检测系统的研究

入侵检测技术是一种新的安全保障技术，它用于对计算机和网络资源上的恶意使用行为进行识别和响应．文章在深入研究分析公共入侵检测框架理论和现有入侵检测系统实现策略的基础上，提出一种基于部件的入侵检测系统，具有良好的分布性能和可扩展性．     

基于Agent的分布式入侵检测模型研究

传统的入侵检测系统多采用集中式的分析引擎,误报率较高且缺乏自适应性,难以满足大规模分布式网络环境的安全需求.Agent技术有效地解决了网络间任务分配合作问题,本文提出了一种基于移动Agent的主动网络自适应入侵检测系统.系统通过响应分析,自动产生响应策略,并派遣移动Agent去执行;根据入侵检测系统的报警可信度和响应执行情况,系统能够自适应地调整响应策略.同时,针对现有大多数模型具有较高漏报率的问题,提出一种基于蜜罐分布式的入侵检测系统模型.     

基于环形结构分布式协同入侵检测系统的架构

通过分析目前分布式入侵检测系统的特点和协作方式,提出了一种基于环形结构分布式协同入侵检测系统的体系结构;论述了在环形结构中事件发生器、事件分析器和事件响应器的结构,利用协议分析、数据分析、命令解析和协同处理器,使得在基于环形分布式协同入侵检测系统实现更方便;解决了目前分布式入侵检测系统中各系统结构复杂、负载不均衡等缺陷.     

网络安全防范与入侵检测技术

入侵检测是近几年发展起来的新型网络安全策略，它实现了网络系统安全的动态检测和监控。介绍了入侵检测系统的体系结构和检测方法，指出了入侵检测系统应具有的功能以及入侵检测系统的分类，分析了现有的入侵检测技术以及多种检测技术在入侵检测系统中的应用。     

分布式入侵检测系统中告警关联部件整体框架设计

告警关联能够将现有的入侵检测系统从只能检测单个入侵事件或异常状态转化成检测入侵过程,从而提高入侵检测系统的有效性和可用性。该文给出了一种分布式入侵检测系统中告警关联部件整体设计框架     

一种基于RBF神经网络优化算法在入侵检测中的应用

入侵检测系统是当前信息安全领域的研究热点,在保障信息安全方面起着重要的作用．笔者对原有的基于RBF神经网络的入侵检测模型进行改进并给出了设计思想．该模型能将入侵检测系统的两种检测技术——误用检测和异常检测有效地结合起来,使用两层RBF神经网络训练模块,三层训练机制,在训练时间方面有较大的优势,并能实时地检测到新型攻击．     

基于移动Agent的分布式入侵检测系统

介绍了几种常见的分布式入侵检测系统,针对目前入侵检测系统的不足,将新型分布式处理技术移动 Agent与入侵检测融为一体,提出了一种基于移动代理的分布式入侵检测系统(DIDS)的模型．系统采用层次 结构的探测和响应机制,各Agent相互独立,同时能在网络中自由移动、相互协作,以检测分布式攻击,并具 有良好的灵活性、健壮性和可扩展性．     

图书馆网络管理中一种基于移动agent的入侵检测系统

针对现有入侵检测系统存在的问题，本文提出了一种基于移动agent的图书馆网络入侵检测系统模型，该模型是一种分层次的系统模型，实现了入侵检测和实时响应的分布化，同时增强了入侵检测系统的灵活性、可伸缩性、鲁棒性、以及安全性。     

一种分布式入侵检测系统的设计

首先简要概述了入侵检测技术的现状、分析了现有技术的优缺点，然后提出一种基于部件的分布式入侵检测系统，它集成了误用检测和异常检测方法。文章最后设计了两种改进的分析方法。     

基于粗糙集的自适应入侵检测算法

为了提高入侵检测系统的检测率,降低错检率,在分析现有入侵检测方法基础上提出一种基于粗糙集的入侵检测算法,将粗糙集算法和入侵检测技术结合起来实现系统的安全检测.对收集到的入侵数据进行预处理、数据离散化,属性约简,并依据生成的检测规则来分析入侵数据.实验结果表明: 与基于BP(back propagation)神经网络和支持向量机的入侵检测算法比较,该算法的检测率提高10%左右,能很好地为信息系统提供入侵检测服务.     

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.     

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.     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with