光网格计算环境下基于抢占的多优先级提前资源预留机制

提前资源预留是光网格计算中一种重要的资源占用形式,能较好地保障资源的协同服务需求和网格应用的服务质量。通过研究光网络中动态路由和波长分配问题,提出了一种基于抢占的多优先级波长资源预留算法。仿真结果表明该算法保证了高优先级业务下能够兼顾网络全局资源分配,可以在一定程度上减少资源碎片,提高资源利用率,性能明显优于传统的RWA算法。     

波长路由多纤环网的优化设计

在给出波长路由环网模型的基础上,提出了一种新的整数线性规划公式以解决波长路由多纤环网（MFR）的优化设计问题,整数线性规划公式所采用的优化目标是最小结点端口数目,以此为优化目标可以保证所设计的多纤环网具有最大的经济性,利用所提出的整数线性规划公式,定量分析了在不同通信模式（单Hub和双Hub),及路由方案（波长通道和虚波长通道）的情况下,单向和双向波长路由多纤环网的网络性能差异,所获得的结论有助于多纤环网结构的优化设计。     

WDM光网络中的RWA分析

智能光网络被认为是下一代高速广域骨干网的最具竞争力的候选方案,代表了下一代光网络的发展方向。路由选择和波长分配（RWA）是智能光网络中的一个关键技术,它是指网络某对节点间有光路建立请求时,如何寻找从源节点到目的节点的路由并在路由上分配波长。优化光通道的选路和波长分配（RWA）是网络设计的核心问题,其主要任务是寻找一条合适的光路并为之合理地分配波长,使有限的资源充分发挥作用,以提供尽可能大的通信容量。     

多粒度光交换网络中的一种波长/波带共享转换池结构

鉴于目前光网络整体成本较高,波长转换器利用率较低的缺点,在研究现有的多粒度光交换结构的基础上,提出了一种共享波长/波带转换器的方案。该方案的技术特点在于在波带交换矩阵和波长交换矩阵之间增加了一个共享转换池,光纤中需要进行转换的波带和波长都进入共享转换池,共享使用转换池中的波长/波带转换器进行转换。实例表明该方案能够使光网络中波长转换器的数量大幅度减少,在降低了光网络成本的同时提高了波长/波带转换器的资源利用率。     

多纤芯弹性光网络中虚拟网络映射模型及算法

为解决多纤芯弹性光网络虚拟化中的虚拟结点映射、链路映射和频谱分配问题,首先建立了一个以最小化占用的频谱数及最小化最大占用频隙号为目标的全局约束优化模型.其次,设计了具有高效的交叉、变异及不可行解可行化算子的全局优化遗传算法,以有效求解该模型得到最优的虚拟节点、链路映射方案.最后,为验证算法的有效性进行了不同的仿真实验.结果表明,所设计的算法能够有效地减小网络中占用的频谱数和最大占用频隙号.     

多粒度光交换网络中的一种波长/波带共享转换池结构

鉴于目前光网络整体成本较高，波长转换器利用率较低的缺点，在研究现有的多粒度光交换结构的基础 上!提出了一种共享波长/波带转换器的方案。该方案的技术特点在于：在波带交换矩阵和波长交换矩阵之间增加 了一个共享转换池，光纤中需要进行转换的波带和波长都进入共享转换池，共享使用转换池中的波长/波带转换器 进行转换。实例表明：该方案能够使光网络中波长转换器的数量大幅度减少，在降低了光网络成本的同时提高了 波长/波带转换器的资源利用率。     

多纤光网络的光纤物理路由最大不相关算法

由于外力施工和自然灾害等原因,往往会造成同一物理路由的多根光纤同时断裂,因此在多纤光网络中,确定工作通道和保护通道,仅与链路无关还不够,必须要求物理路由不相关.基于这一观点,从提高网络生存性的角度出发,提出了一个适合于多纤光网络的路由波长分配算法———光纤物理路由最大不相关算法.文中介绍了算法的基本思想、实现方法、仿真模型及结果示例.     

一种网格计算环境下WDM网路由和波长分配算法

波长路由光网络为网格计算动态提供端到端的专用光路，以满足网格计算应用的数据密集性，提前预留是 网格计算中一种重要资源占用形式。目前波长路由光网络的提前预留研究多是关注用户请求的弹性调度，以缓解 资源碎片影响。从路由和波长分配（RWA）算法缓解资源碎片影响的角度，分析了提前预留中RWA算法的特殊 性，在已有路由和波长分配问题上增加了时间向量因素，并提出了最少资源碎片聚集（L-RFC）算法，引入了时间向 量上的资源碎片影响因子作为波长分配权衡因素，将资源碎片影响分散在不同波长上。仿真证明，该算法即降低 了阻塞     

基于机器学习的区分可用性抗灾难保护策略

针对灾难下空分复用弹性光网络中业务的保护成功率低、保护开销以及芯间串扰高的问题,提出一种基于机器学习的区分可用性抗灾难保护策略.首先,使用基于线性判别式分析的支持向量机感知业务可用性需求;然后,在此基础上采用动态竞争优先级分配,在确保业务可用性需求的前提下,为多链路故障提供最大化保护频谱的共享;最后,为了降低芯间串扰,设计了交替式频谱纤芯选择方案.仿真结果表明:该保护策略在提高业务保护成功率的同时,可以取得较低的频谱冗余率和芯间串扰.     

SDM-EONs中分层图辅助的资源分配策略

为降低空分复用弹性光网络(SDM-EONs)资源分配过程中的芯间串扰,并减少光路频繁拆建所产生的时间和频谱维度碎片,提出了一种分层图辅助的路由、纤芯和频谱分配策略.该策略主要分为离线预测与在线调度两个阶段:首先结合网络中业务序列的时间特性,利用基于门控循环单元的循环神经网络模型完成未来业务属性的离线预测;然后根据图染色理论建立考虑芯间串扰的分层图架构三维网络资源模型;最后利用离线预测结果和分层间的不同特性,设计综合度量时间和频谱维度的自适应在线资源分配算法,从而实现资源的高效调度.仿真结果表明:该策略在提高资源利用率的同时,显著降低了网络芯间串扰和阻塞率.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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