基于小波分析的网络流量随机模拟

为了快速生成具有自相似特性的模拟网络流量,应用小波变换将实际测量到的网络流量分解成不同尺度下的小波系数（细节信号）和尺度系数（背景信号）,并把这些系数分割成长度相等的很多个小段,然后从每个尺度下的细节信号中和背景信号中分别随机抽取一个小段进行叠加,多次重复该操作,就可以得到较长时间范围内的模拟网络流量,采用方差时间曲线图对模拟生成的网络流量的自相似特性进行了分析,结果表明：用该方法模拟的网络量具有较好的自相似性,而且简单,速度快。     

网管测试平台中流量数据的生成算法

针对网络管理测试系统对模拟真实可信的网络流量数据的需求,提出一种数据生成算法。在分析当前网络流量特点的基础上,明确网络流量的自相似性,再根据实际采集的网络流量的调制特征,采用源叠加ON/OFF模型生成模拟数据,以流量数据的多重分形特征为标准,对模拟结果和真实数据的相似性进行了评估。结果表明,采用该算法生成的数据可作为网络管理测试平台中的流量驱动数据。     

基于小波变换的网络流量预测

由于现代的数据通信网络中网络流量存在很强的自相似性,如何降低这种自相似性给网络的性能造成的不利影响成为大家关注的焦点。本文通过实际的网络流量数据,利用小波变换和平稳时间序列的AR模型,实现了对网络流量很好的预测,其结果对于在网络中优化排队算法和实施流量工程具有很好的参考价值。     

基于小波包分析的网络流量组合预测模型

提出一个基于小波包分析的网络流量组合预测模型,将流量数据构成的原始序列进行小波包分解,并将分解得到的各近似部分和各细节部分分别单支重构成低频序列和高频序列.根据低频序列和高频序列的不同特性,分别采用自回归模型（AR）和线性最小均方误差估计（LMMSE）对未来网络流量进行预测,最后重新组合生成预测流量.通过对真实网络流量...     

基于小波包分析的网络流量组合预测模型

提出一个基于小波包分析的网络流量组合预测模型,将流量数据构成的原始序列进行小波包分解,并将分解得到的各近似部分和各细节部分分别单支重构成低频序列和高频序列.根据低频序列和高频序列的不同特性,分别采用自回归模型（AR）和线性最小均方误差估计（LMMSE）对未来网络流量进行预测,最后重新组合生成预测流量.通过对真实网络流量的仿真实验,结果显示该模型能够对网络流量进行比较精确的预测.     

网络流量的自相似特性

利用小波技术对网络流量进行特性分析，将网络流量过程分解成不同尺度下的小波系数(细节)和尺度系数(背景)，从而刻画出网络流量的自相似特性.     

基于小波变换与组合模型的网络流量预测算法

针对网络流量在以不同时间尺度分析时呈现不同特性给流量精确预测带来的困难,提出一种基于快速小波变换和季节差分自回归滑动平均组合模型的多分辨分析预测算法.采用小波方法对网络历史流量进行分解以分析不同时间尺度下的流量相关结构,根据不同时间尺度下的流量时间序列的周期性和自相似性,分别选择合适的模型建模用于预测.使用小波方法对各序列的预测值进行重构,得到原始流量的预测结果.仿真结果表明,所提预测方法比同类预测方法具有更高的精度.     

基于NS2的DDoS入侵流模拟

根据网络流量自相似性的形成机理和DDoS攻击流的特点,综合网络中两种常见协议：TCP和UDP协议,提出了一个新的基于NS2的DDoS入侵流模拟方法,实验结果表明,使用该法得到的模拟背景流保持了真实的网络业务流自相似性特征,可用于对入侵流流量特征方面的分析研究。     

一种基于混合模型WRC的流量预测方法

针对当前网络流量预测方法在刻画网络流量多重特性方面存在的准确性及噪声干扰的问题,提出了一种基于混合模型WRC的流量预测方法,该方法利用小波分解将网络流量混沌时间序列分解为流量特性不同的近似时间序列和细节时间序列,并利用RBF神经网络和混沌模型分别对这两种时间序列进行处理,得到预测时间序列后再进行小波重构,得到最终的预测值.仿真实验结果表明模型预测有效,且预测精度较高.     

自相似流量的小波神经网络预测模型研究

随着计算机网络体系规模的不断扩大,降低网络性能的影响因素也日益增多。由于网络流量的突发性会增加对网络性能的影响,该文针对网络流量的自相似特性和可预测性,提出了一种自相似流量的小波神经网络预测模型。此模型通过对已知的网络流量数据进行训练,得到预测流量,完成对自相似流量的可预测性的验证,最后对预测模型的性能做出评价。与传统的线性模型相比,自相似流量的小波神经网络模型在仿真过程中表现出预测的精确程度高、逼近最优值的速度快的优点。     

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.     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-