基于MPLS VPN技术的宽带城域网的组网设计

MPLS VPN在提供企业网互联业务的专线市场具有高带宽、高可靠性、网络部署灵活等优势,被各大电信运营商视为未来多服务基础核心的技术趋势。本文介绍了MPLS VPN的基本原理,探讨了宽带城域网组网方案设计。     

MPLS VPN技术在烟台城域网中的部署和应用

MPLS VPN技术利用公用骨干网络强大的传输能力,不仅降低网络建设成本,提高用户网络管理的灵活性。同时也可以满足用户对信息传输安全性、实时性、宽频带、方便性的各种需要。本文描述了在烟台宽带城域网中如何部署MPLS VPN技术以及应用方式。     

MPLS VPN、IPSec VPN和SSL VPN技术的研究与比较

为了保护私有数据传输的安全性,高效性和快速性,需要特定的安全技术创建和维护VPN网络.目前有3种VPN技术-MPLS VPN,IPSec VPN和SSL VPN得到较多的应用.本文简要介绍了这3种VPN技术并分析了其优缺点,提出应该结合各种技术更好的为VPN服务.     

基于仿真实验环境下对网络服务质量的研究

针对目前城域网差别化服务质量的部署现状,设计了基于Cisco网络实验环境并搭建BGP/MPLS VPN网络,部署MPLS DifferServ和DS-TE应用模型.通过对穿越城域网VPN的四种业务的QoS参数进行分析,结果表明在网络资源匮乏的情况下,DS-TE应用模型很好地提升了IP城域网差别化服务质量,DS-TE改善了在一条或一组LSP隧道为不同VPN业务、同一VPN不同业务以及VPN业务和非VPN业务之间的服务质量问题.     

IPSec VPN与SSL VPN的对比

文章介绍了目前主流的两种VPN技术：SSL VPN与IPSec VPN，并在部署管理、安全性、扩展性、访问控制、经济性五方面作了对比。     

基于虚拟专用网络的数字图书馆远程访问模式设计

对于图书馆服务而言,VPN正在得到广泛的推广与应用,既能够为图书馆之间的资源共享提供网络传输途径,又可以为远程异地用户提供资源服务,本文在介绍虚拟专用网技术的基础上,给出了基于VPN的图书馆资源远程访问解决方案.     

浅谈如何利用VPN服务江苏省文化信息资源共享工程

介绍了VPN的组网方式、实现技术、功能特点,提出了利用VPN技术实现省内共享工程网点互联互通的网络部署,阐述了VPN与图书馆建设的关系。     

浅谈SSL VPN校外访问图书馆数字资源应用与管理

介绍了顺德职业技术学院图书馆引进的SSL VPN技术,对SSL VPN校外访问的环境部署、应用和管理进行了说明。     

IPSec VPN的工程应用对比研究

本文分析了IPSec VPN的主要技术，阐述了主流网络设备实现IPSec VPN的特点与工程应用场景，对比了不同产家实现IPSec VPN的差异，为大中型企业网络部署提供了实践参考。     

视频分发技术研究

针对网络服务商提供视频服务部署成本过高问题,提出一种提供弹性服务的方法.首先,根据抽样原理建立不同点播时段请求到达率的预测模型;在此基础上应用流模型、微分方程稳定性理论和信号博弈原理建立了系统提供弹性服务的方法.该方法能够有效降低服务商的部署成本,提高系统的可扩展性和视频分发质量;最后通过仿真实验验证了提出方法的可行性...     

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.     

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.     

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