基于负载均衡的在线云存储流量调度研究

在线云存储流量的调度问题是当前网络的研究热点。针对在线云存储系统中的文件上传请求调度问题,现有方案很少满足为用户提供不同带宽保证这一需求。针对不同付费级别用户要求不同带宽保证的服务场景,设计了基于请求队列长度的最大权重调度机制以及实际中可用的分布式二次随机选择调度算法,旨在实现系统服务器的流量均衡,同时最大化系统吞吐量。证明了最大权重调度机制能够保证系统稳定性,并且最大化系统吞吐量。实验结果表明,二次随机选择算法能够获得接近于最大权重调度机制的性能,较小的时间延迟和较大的系统吞吐量。其性能优于传统的Round-Robin调度算法。     

基于非合作博弈的有序用电算法

文章针对用户的基本负荷、储能和温控等典型负荷,采用实时电价机制,提出了基于非合作博弈的有序用电算法。运用此算法,在经过多轮博弈之后,台变侧和用户侧能够达到一个最优的Nash均衡解,保证了所有参与者的利益最大化的同时又能保证台变侧峰平比最小,从而智能地、有序地调度多用户参与电网负荷调控,实现有序用电,减少峰谷差值、提高收益。最后,通过一个算例证明该有序用电算法的有效性。     

计及差异化用户偏好的光储充一体化家庭用能系统多目标优化调度

基于价格型需求响应的家庭能源管理系统优化调度可显著提升家庭用能体验。同时,用户侧光储充一体化用电新模式也给家庭能源管理带来新的挑战。针对供给侧光伏出力问题,提出了一种耦合改进惯性权重混沌粒子群算法和长短期记忆神经网络的ICPSO-LSTM组合预测模型,对光伏发电进行精准化预测;针对用能侧负荷多样性特点,将其划分为不可调度、可中断、可转移三类进行精细化建模,并综合考虑电动汽车短途、中途、长途个性化用能行为及反向供电模式Vehicle to Home(V2H)。在此基础上,根据不同用能偏好,将用户划分为经济型、标准型和舒适型,构建考虑用户用能成本和舒适度的多目标优化模型,并采用ICPSO算法进行求解。最后,对比分析了典型场景下家庭能源管理系统的实施效果。     

造纸厂负荷监测和优化调度系统

针对造纸厂用汽、用电设备负荷变化大 ,管网汽压、电压波动影响生产的情况 ,通过建立基于PROFIBUS的经济型现场总线测控系统 ,对造纸生产过程中的水电汽负荷进行监测 .以动态调度模型为参考模型 ,运用隐枚举算法编制能源调度优化程序 ,对整个造纸厂的能源消耗进行了优化调度 ,达到了节能降耗的目的 .     

主动配电网下分布式能源系统双层两阶段调度优化模型

为解决当前能源系统调度优化模型分层调度能力不高的问题,在控制分布式能源系统运行成本的前提下,构建主动配电网下分布式能力系统双层两阶段调度优化模型。优化调度模型分层调度函数,并设定能源系统调度约束条件。使用帝国竞争优化算法对能源系统调度优化模型进行求解,获取最佳调度方案。构建算例分析环节,引入IEEE-33节点配电网测试系统完成分析过程。算例测试结果表明：此模型在日前阶段与日内阶段均可提高能源利用率,确保了能源系统的经济性。可见此模型可有效提高分布式能源的消纳能力,使主动配电网的经济效益最大化。     

超密集部署下绿色能源感知的用户关联算法

为了降低网络能耗,实现5G绿色蜂窝网络,考虑电力能源和绿色能源同时供电的混合能源供应的超密集异构网络模型.为了更准确地模拟密集部署下基站与用户之间的信道衰落,采用5G中的双斜率路径损耗模型对大尺度信道衰落进行建模,并在此模型下提出一种改进的基于绿色能源感知的自适应用户关联算法.该算法为基站设置优先级和权重因子,用户根据基站的优先级和权重因子自适应地调整自身的关联策略,并结合资源分配完成用户关联过程.仿真结果验证了所提算法在能耗和能效方面的优越性.     

以用户为中心的需求响应博弈模型与算法研究

智能电网是电力用户和供应商之间双向通信的下一代电网.有效的需求响应管理可以降低发电成本和用户用电费用.在供电方引入多个火力发电和多个可再生能源电力公司,提出一种面向用户需求的电力公司选择方案,以最大限度降低用户成本,同时可以改变用电的峰谷期.通过整合可调度负载与电力公司的选择制定联合方案,提出用电与供电之间的博弈模型.利用分布式算法,证明博弈均衡的存在.计算机仿真结果表明,联合方案可使用户成本最低,并且可以达到电网削峰填谷的效果.     

基于效用分类的智能电网实时电价算法

在智能电网实时定价过程中,针对家庭住宅用户,大工业、商业用户分别采用不同效用函数,改变了以往所有用户仅考虑单一效用函数的局限,使用多类效用函数模拟不同用户的消费偏好,研究了含有多类用户并存的社会福利最大化模型。根据市场供需平衡才能达到社会福利最大化原理,利用KKT最优性条件,分别计算供电侧的最优产电量和用电侧的最优用电量,得到了相应的分布式实时电价更新算法,保护了用户的隐私。通过数值仿真对分布式实时电价算法与固定电价算法相比较,证实了该算法的有效性、收敛性。     

基于强化学习的写字楼动态电力价格策略研究

针对城市商业区写字楼的微电网能源管理系统,如何有效的进行能量协同调度具有重要的理论价值与应用价值。本文提出了基于强化学习的写字楼能量调度的需求侧动态价格响应算法。首先,将物业与写字楼之间的模型建立为一个马尔可夫决策过程（Markov Decision Process,MDP）,通过使用Q-Learning算法中的贪婪策略（ε - greedy）来探索写字楼中每个时间间隙的最佳电力零售价格。实验表明,通过需求侧动态价格能量调度策略不仅可以提高电网的可靠性和能源的有效利用率,实现电力分流、削峰和填谷,也可有效降低写字楼的能量消耗,同时降低用户的电力能耗使用成本,使得各方利益最大化,验证了本文所提算法的有效性和实用性。     

基于用户偏好和层次分析的数字家庭业务调度算法

根据用户对业务的使用偏好提出了一种基于层次分析法(AHP)的数字家庭智能业务调度算法,通过对制约因素、备选业务进行相对权重分析,确定最符合用户需要的业务,从而可以提前调度业务,保障用户使用业务的满意度和舒适度.结果表明,考虑用户偏好的层次分析调度算法更能适应个性化的数字家庭环境,与轮询调度算法相比,提出的业务调度算法成功匹配率更高.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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