基于命名数据网络的5G架构网络层研究

为了应对移动通信数据流量的爆发式增长,克服当前移动互联网存在的弊端,提出基于命名数据网络的5G系统架构.与IP网络架构不同,该架构在网络层部署命名数据网络协议从而改变传统端到端的通信模式.通过对该架构网络层的用户体验速率、端到端传输延时和移动性等方面进行仿真实验,证明基于命名数据网络的5G系统架构网络层具备优秀的通信性能,可满足未来移动互联网的发展需求.     

软件定义网络SDN新型网络架构研究

系统研究了SDN网络体系结构,对SDN中的关键技术和设备进行了分析,构建了SDN实验环境,模拟了SDN通过控制流标实现数据转发的过程,介绍了SDN技术的优势和应用场景,并对SDN网络的发展进行了展望。SDN作为一种新型网络架构,能够将网络的转发功能和控制功能彻底分离,相比较传统的OSI七层架构,在数据转发和网络管理等方面具有明显优势,该技术为未来网络技术革新指明了方向,逐渐受到网络技术研究人员的认可。     

探讨SDN的5G移动通信网络架构

随着科学技术和信息化的不断发展,互联网也越来越普及,发展得也越来越快,所以相关的用户的需求也在不断地提高。为了很好地满足用户的使用需求,在相关的仪器设备和技术方面也是日新月异的变化着,使得移动通讯系统的改革效率也大大提高了。目前我国的4G移动通信技术已经很成熟,而5G的移动通信技术也在不断地进步发展着。与传统的移动通信技术相比,目前的新技术5G技术拥有着更加明显的优势,在数据的传输效率和兼容性方面也越发得优异。因为5G通信技术的优势和作用,所以基于SDN的5G移动通信网络架构是目前非常热的研究课题和研究方向。     

基于SDN技术的大理学院校园网络设计研究

SDN的原理是将网络的控制平台和数据平台分离,由可编程控制器负责网络的数据转发策略。SDN的核心技术是OpenFlow。在SDN原理基础上,根据校园网的应用特点,设计了基于SDN技术的大理学院校园网的网络架构、拓扑、网络管理控制平台和虚拟化控制平台,分析了基于SDN的大理学院校园网的性能。     

面向5G协作通信系统的资源分配技术综述

随着物联网技术的发展和移动设备的爆炸性增长,无线网络呈现出异构化、超密集等特性。协作通信具有可提高系统容量和覆盖范围的特点,被广泛应用于5G移动通信网络中。从中继选择、转发方式和收发机增益等不同角度对中继网络模型进行分析;介绍了5G协作通信系统下的网络模型,如非正交多址接入网络、大规模多输入多输出网络、超密集异构网络和设备间通信网络等,并对不同网络模型下的应用场景进行阐述;对5G协作通信系统的资源分配优化模型和中继选择算法进行了类比分析与总结;提出了基于中继协作的5G通信系统网络中尚存的问题,并在此基础上对未来研究方向进行了展望。     

5G移动通信网络关键技术综述

为适应未来海量移动数据的爆炸式增长,加快新业务新应用的开发,第五代移动通信(fifth generation mobile communication network,5G)网络应运而生.目前,国内外已经逐渐明确了5G的愿景和需求,如何将现有技术和多种潜在的新技术进行融合以实现5G网络成为下一步的研究与发展重点.面向未来5G的技术发展,介绍5G的概念、应用场景以及终端用户对5G的相关需求;然后,重点阐述5G在无线网络方面具有发展前景的10大关键技术,包括:超密集异构网络、自组织网络、D2D (device-to-device)通信、M2M (machine-to-machine)通信、软件定义无线网络、信息中心网络、内容分发网络、移动云计算、软件定义网络/网络功能虚拟化、情景感知技术.给出了每种技术的基本概念或原理,以及应用到5G网络时潜在的研究问题.最后概述了5G的发展趋势及存在的难点.     

第五代移动通信网络体系架构及其关键技术

日益增长的数据流量以及智能终端的普及,导致第四代移动通信网络(4G)在容、速率、频谱等方面已经不能满足人们对网络的需求。基于此,第五代移动通信网络(5G)应运而生?在回顾移动通信近年来的发展历程的基础上,从网络部署场景、接入网?核心网三大块,总结出一种5G的网络架构,该架构具有大容量?高速率?低时延的特点?基于此架构,描述了5G的四大潜在关键技术:超密集异构部署、D2D(device to device)通信?大规模MIMO(multiple input multip leoutput)、绿色通信,同时叙述了未来研究存在的挑战。     

面向5G业务的OTN承载思路探讨

该课题对面向5G业务的OTN承载思路进行探讨。首先对面向5G业务的OTN承载组网构架进行简述,并对面向5G业务的OTN中传和回传承载策略进行介绍,采用E-OTN功能不仅实现微妙级时延和大带宽的通信业务传输,而且能够组网灵活汇聚和转发。同时对面向5G业务的OTN承载关键技术进行分析,其中包含速率快成本低的传输能力、光电混合型调度、us级延时传输及转发、面向5G业务的OTN承载的标准化、高精度的时钟同步、光网络和分组的结合,以适应未来5G通信网络技术发展,满足组网灵活性、低时延、带宽大和系统容量高的通信需求。     

5G时代光与无线融合接入网及其关键技术研究进展

随着第五代移动通信技术的演进升级,移动网络将支持更为庞大的移动用户群及更为多样的业务场景,大幅提升互联网业务体验,全面支持物联网感知应用。从无线接入网发展趋势入手,分别对其架构演进及关键技术,包括无线接入技术、光承载技术、前/中传接口技术、控制管理技术、网络切片技术等进行了详细分析,并指出无线接入网络在向5G时代发展中面临的重要挑战。     

当TD-LTE与WiFi技术走向融合

作为新一代移动通信技术,LTE以OFDMA和MIMO为主要技术基础,满足更低传输时延,大幅提高用户传输速率,增加容量和覆盖,减少运营费用,优化网络架构,采用更大载波带宽,并以优化分组数据域业务传输为目标. 随着技术不断发展,移动应用的增长迫使人们必须不断提高频谱资源的利用率,因此TDD技术在全球范围内受到了前所未有的高度重视.而作为全球主流的4G标准,TD-LTE必然为产业界所青睐.数据显示:截至2013年2月,全球已有13家运营商部署了14张TD-LTE商用网络.2012年12月,中国移动首张TD-LTE商用网络在中国香港正式投入运营,在国内13座城市进行TD-LTE扩大规模试验,同时全面加速试商用进程.     

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-