利用LVS和NAT构建高可用的Linux负载均衡集群

为了提高PC服务器的可靠性和计算能力,文章介绍了用NAT和LVS实现的Linux集群技术,通过调用相关的集群算法,实现强可靠性、负载均衡能力。在几台运行Linux的PCServer上,加入相应的集群软件,就可以组成具有强可靠性、负载均衡能力和计算能力的Linux集群。linuxpccluster技术有效的降低了网络服务成本,解决pc服务器运行中的单点故障问题,为实现企业服务器提供了新的思路和方案。     

开源Linux集群技术研究

Linux在各个领域都得到了广泛的应用。基于Linux构建Web、Mail、FTP、Proxy等应用服务器，已成为当今的主流。开源Linux集群技术应运而生。阐述Linux集群系统的分类及其实际应用。重点研究并实现基于开源Heartbeat的高可用性集群系统和基于开源LVS／NAT转发的LVS负载均衡集群系统。     

Linux-HA HeartBeat的分析与改进

本文分析了Linux上开源项目Linux-HA HeartBeat的基本原理和实现,并针对其无法扩展到多节点、恢复模式单一等问题,提出了对HeartBeat的改进方案,使之成为支持多节点、多种恢复模式的高可用集群心跳机制,成为Linux平台上高可用集群的高性价比解决方案。     

Linux集群节点自动化部署方法与实现

Linux发行版本正在迅速变得功能完善,界面友好,尤其在集群中得到了越来越广泛的应用.Linux集群节点的操作系统自动批量部署及系统本地化是非常重要的一项工作,但这项工作的实施过程显得过于烦琐.为提高Linux集群节点自动化部署的效率,在研究开源软件—SystemImager的基础上,对比其他部署方案,提出了应用SystemImager克隆技术有效完成Linux集群节点的系统安装、软件分发及生产部署全过程的自动化解决方案.     

Linux系统下IP包过滤技术的应用

本文论述基于Linux系统的包过滤技术．阐述Linux系统防火墙的配置，并通过实例介绍Linux信息包过滤方案的实现。     

开源Linux集群系统服务器池存活性技术研究

在对开源Linux集群系统服务器池存活性进行研究的基础上,提出了一个跨平台、实用的解决方案,该解决方案可以广泛应用于Linux高性能集群系统和负载均衡集群系统．     

Linux上软件实现的瞬时故障注入方案及实现

针对基于Linux的计算机系统，提出了一种软件实现的瞬时故障注入方案．它通过Linux的ptrace（）调用，实现故障注入，工作负载选用八皇后算法和Mibench，实验结果验证了所提出的瞬时故障注入方案的有效性．同时也表明，在基于Intd X 86或Pentium的系统设计中，应该对微处理机中EIP，EBP，ESP这三个寄存器予以很好的保护．     

基于镜像的集群系统的部署方法研究与实现

对于拥有大量节点的Linux集群而言，选用一种合适的方法来自动安装部署操作系统和应用软件是必要的。本文利用基于镜像的安装技术及工具、支持网络启动的PXE橼议，采用分布式的网络传揄模型和点对点的通信方式，以实现在集群环境中自动部署Linux操作系统。     

基于Linux集群构建网络服务器的方案分析

Linux是当前最具发展潜力的计算机操作系统，它是一种新的开放自由软件，以高效性、灵活性著称，具有多任务、多用户的特点．随着Linux操作系统的不断完善和发展，用Linux构建网络服务器已成为网络服务器的发展方向．通过对实现虚拟网络服务相关方法的分析，提出了一种可行的构建Linux网络服务器方案．     

基于Linux集群的高性能计算环境

为了提高高性能集群计算系统的计算能力,采用了类似于Beowulf的系统结构和Linux操作系统,提出了Linux环境下基于MPICH软件包的并行集群构建方法,在实验室网络环境下使用多台普通计算机完成了集群的构建,实现了集群的单一登录,单一文件管理,为今后在集群上进行并行编程提供了一个实际的软硬件环境。研究结果表明:构建的基于Linux集群的高性能计算环境,在多机并行环境下,运算时间较单机环境有明显提高。     

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.     

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.     

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.     

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.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that