云计算资源优化问题求解的萤火虫算法

为了提高云计算资源利用率,结合云计算资源优化问题的特点,设计一种云计算资源优化问题求解的萤火虫算法.首先建立云计算资源负载调度问题的约束条件,以用户任务完成时间最少作为云计算资源负载调度优化的目标函数;然后通过萤火虫算法找到目标函数值最优的资源调度策略;最后在CloudSim平台上实现云计算资源负载调度仿真实验.实验结果表明,萤火虫算法减少了云计算任务完成的时间,均衡了云计算资源的负载,使云计算资源得到合理分配,且比其他算法优势明显.     

基于QoS云计算任务调度优化

由于云计算技术快速发展,为了满足日益多样化的云计算用户服务质量(QoS需求)以及提高云计算资源调度的效率,提出基于改进蚁群算法的云计算资源调度优化算法,包括建立云计算资源模型和用户QoS需求模型.为了得到更准确的结论,针对传统蚁群算法过快收敛造成的局部最优解现象,在传统的蚁群算法的基础上加入随机选择机制,时间、成本和结果有效可用性适应度因子进行了优化改良,以求得全局最优解.通过仿真实验将传统的蚁群算法、Mi n-Mi n调度算法和改进的蚁群优化算法进行比较,实验表明,改进的蚁群优化算法在调度效率、节约成本、减少任务执行时间和任务得到结果质量方面有明显的优势.     

基于改进的粒子群优化的云计算资源调度模型

针对云计算系统中多任务并发模式下引发的资源竞争,本文提出了一种基于改进的粒子群优化的云计算资源调度分配模型,以提高资源利用率.首先,对云计算系统中的资源调度问题进行形式化描述,构建以任务的总完成时间为优化对象的目标函数.其次,求解时采用粒子群优化算法,为保证收敛速度且避免粒子群在搜索过程中陷入局部最优,定义了惯性权重函数.另外,引入一个调整算子以优化位置更新.仿真结果表明,本文提出的资源调度分配模型能够有效提高云计算资源利用率,大幅减少任务的处理时间.     

云计算下均衡负载的差异性资源调度算法优化研究

随着云计算的逐渐发展,云计算下容易出现虚拟机负载不均衡和差异性资源调度时间长的问题,当前调度算法大多无法有效解决均衡负载问题,影响调度性能。为此,提出一种新的云计算下均衡负载的差异性资源调度算法,对云计算下资源调度问题进行描述,针对云计算下虚拟机差异性资源负载问题设定参数。设计蚁群优化算法,蚂蚁爬行的每一步代表指派的一个差异性资源任务,引入挥发因子对信息素更新规则进行改进,获取全局信息素。利用蚁群优化算法对云计算下负载的差异性资源进行均衡调度,给出详细实现过程。实验结果表明,所提算法有较好的收敛性,均衡负载效果好,且时间复杂度低。     

云计算下均衡负载的差异性资源调度算法优化

随着云计算的逐渐发展,云计算下容易出现虚拟机负载不均衡和差异性资源调度时间长的问题。当前调度算法大多无法有效解决均衡负载问题,影响调度性能。为此,提出一种新的云计算下均衡负载的差异性资源调度算法,对云计算下资源调度问题进行描述,针对云计算下虚拟机差异性资源负载问题设定参数。设计蚁群优化算法,蚂蚁爬行的每一步代表指派的一个差异性资源任务,引入挥发因子对信息素更新规则进行改进,获取全局信息素。利用蚁群优化算法对云计算下负载的差异性资源进行均衡调度,给出详细实现过程。实验结果表明,所提算法有较好的收敛性,均衡负载效果好,且时间复杂度低。     

基于改进鲸鱼优化算法的资源调度方法

针对在大量数据背景下云计算资源调度模型存在调度效率低、分配不合理等问题,提出一种基于改进鲸鱼优化算法（m-WOA）的云计算资源调度方法。提出了云计算资源调度模型,针对基本鲸鱼优化算法存在迭代后期种群多样性减弱、易陷入局部最优等不足,提出使用Tent混沌反向学习策略来增强种群多样性;并使用精英随机组合策略平衡算法开发和探索能力。将改进后的m-WOA算法用于数值仿真实验和云计算资源调度模型求解。实验结果表明,m-WOA具有更好的收敛精度和更强的稳定性;m-WOA能有效减少云计算完成时间和能源消耗,并提供更合理的资源调度分配方案,从而提升云计算资源利用率。     

基于CSA和PSO的多目标优化任务调度算法

针对现有云计算环境中任务调度算法资源利用率低、完成时间长和调度成本高的问题,提出一种基于布谷鸟搜索算法(Cuckoo Search Algorithm,CSA)和粒子群优化(Particle Swarm Optimization,PSO)混合的多目标优化任务调度策略.该策略以完成时间、成本以及最后期限违反率为目标函数,...     

改进粒子群算法的云计算环境资源优化调度

针对云计算的资源调度问题,提出一种基于改进粒子群优化算法(Improved Particle Swarm Optimization,IPSO)的资源调度算法.对云资源调度问题进行分析,建立云资源调度的目标函数,利用PSO较快的收敛速度找到云资源调度问题的最优解,并根据每个粒子的适应度值自适应地改变每个粒子的速度权重,提高了全局寻优能力和收敛能力,同时在Cloud Sim平台对算法进行仿真实验.结果表明:IPSO算法减少了任务的平均完成时间,提高了任务处理的效率,具有很好的优化资源以及合理调度资源的能力.     

云计算环境下的大规模图状数据处理任务调度算法

针对云计算环境下调度算法必须考虑资源租赁成本的问题,提出一种新的基于粒子群优化的大规模图状数据处理任务调度算法(LGPPSO).首先,该算法将图状数据处理任务调度方案编码为粒子群中粒子的位置,并利用任务的调度长度和资源租赁成本建立适应度函数来评价当前粒子的优劣程度,然后重新定义粒子群的参数和相关操作,最后在算法的每一次迭代过程中,粒子不断更新自身的速度和位置,以获得任务调度的近似最优解.模拟实验结果表明:在仅以调度长度为目标时,LGPPSO算法的调度长度比异构最早完成时间任务调度算法(HEFT)平均降低约12.3%;在以调度长度和资源租赁成本为目标时,与成本感知任务调度算法(CCSH)相比,在资源租赁成本基本一致的情况下,LGPPSO算法的调度长度平均降低约9.97%.     

基于不同分配策略的云计算任务调度性能比较与分析

形式化描述了云计算环境下的负载均衡任务调度问题,借助动态规划方法形式化推导了最早完成时间的启发式优先分配策略,给出了基于先易后难优先分配策略、先难后易优先分配策略的启发式云计算任务调度算法。阐述了基于顺序调度策略、先易后难优先分配策略、先难后易优先分配策略等启发式任务调度算法和基于禁忌搜索策略、元胞演化策略等智能任务调度算法。针对不同分配策略的云计算任务调度进行性能比较与分析,提出了完成时间可改进百分比和资源负载平衡因子的调度性能评价指标,实验数据对比充分表明:与启发式调度算法相比,智能调度算法能减少任务执行时间,优化资源负载均衡性能。     

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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