IPv6在家庭组网中的应用研究

IPv6技术有许多先进的特点,例如:无状态自动配置、支持移动和具有认证、加密安全机制,这些特点将会促进Internet的进一步发展.本文将结合IPv6的这些特点讨论它在家庭网络的应用,以及研究IPv4向IPv6的过渡方案.     

IPv4向IPv6迁移的过渡策略

随着Internet的发展，IPv4的问题逐渐显露出来，IETF开发的IPv6基本能解决这些问题，所以从IPv4向IPv6过渡已成为必然，这里论述了IPv4的局限性及IPv6的提出，介绍了IPv6协议的特点，给出了IPv6过渡的策略，尤其是隧道技术。     

实现 IPv4到IPv6的过渡的几种互通技术的探究

目前涉及到IPv6领域的主要研究课题有：域名服务器DNS的构成，IPv6路由器以及IPv4的INTERNET网平滑过渡，在IPv4往IPv6过渡中最主要的问题是不允许INTERNET发生大的混乱，这涉及到应用主机上IPv6支持协议，路由与管理等问题，本文将对用于实现IPv4与IPv6互通功能的技术作一一的分析，并对它们各自的适用情况以及各自的特点作出比较分析。     

刍议IPv6网络扫描

IPv4环境中的传统扫描方法完全移植到IPv6环境中进行网络探测将难有大的作为。因此必须在传统网络扫描方法的基础上并结合IPv6网络地址空间巨大和使用范围的特点，研究出新的IPv6环境中的扫描方法，才能对IPv6网络进行行之有效的探测.     

新一代IP协议特点分析

IP安全是保证Internet网络安全的重要部分。从分析IPv4各方面所面临的问题入手，与新一代IP协议IPv6作了比较，详细分析了IPv6地址空间，地址结构，扩展，对扩展选项的支持，流标记，身份证及封装安全载荷等特点，可以看出IPv6有效地解决了IPv4面临的地址枯褐，路由效率低，缺少安全性及服务质量等问题，IPv6将进一步推动Internet网络的发展。     

IPv6安全机制分析

随着网络规模的进一步扩张以及新应用、新业务的不断涌现,IPv4已经不能满足网络发展的需求。IPv6将逐步代替IPv4,本文介绍了IPv6的新特点,分析了IPv6体系结构的安全保障和安全机制。     

从IPv4到IPv6的转化及策略

详细讨论因特网的协议IPv4和IPv6，并分析了各自的特点，提出IPv4中提供相当于IPv6服务质量的一个策略。     

面向物联网的IPv6协议简化

将IPv6技术融入物联网中,不仅解决了物联网节点寻址与通讯的问题,同时还能解决大规模物联网地址不足、缺乏应有的安全机制等问题。针对物联网节点资源受限的特点,提出了IPv6物联网中协议简化的4条原则,并根据这些原则对传统互联网中的IPv6及DHCPv6协议进行了简化研究。模拟实验证明,简化后的协议不仅未影响原有协议的功能,还具有高效、节能和占用资源少等特点,从而整体上提高了物联网数据吞吐率。     

IPv4与IPv6的特点及发展前景比较

文章通过介绍IPv4和IPv6的技术特点,论述IPv4和IPv6应用现状及发展前景,IPv6终将代替IPv4,以适应网络时代的需要和发展。下一代互联网络是未来信息社会的制高点,IPv6是下一代互联网的基础和灵魂,它将为互联网换上一个简捷、高效的引擎,不仅可以解决IPv4的地址短缺问题,而且可以使互联网摆脱日益复杂、难以管理和控制的局面,从而使互联网变得更加稳定、可靠、高效和安全。     

基于LINUX系统的IPv6网络安装与调试

简要介绍了下一代互联网（即IPv6网络）的通信协议，重点说明IPv6的地址结构特点及其管理机制，分析在现有硬件技术和网络环境条件下IPv6网络的组网技术及实现方案，特别是如何由现行的IPv4平稳地演进到IPv6；最后，详尽介绍如何在Linux系统平台下实现IPv6网络的安装与调试。     

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-