一种改进的基于动态信任的分布式调度模型

任务调度是分布式计算系统研究的核心内容之一,而基于动态信任的任务调度算法在志愿计算和网格计算系统中具有很好的性能,这种算法能够较好地处理节点的不确定性.首先介绍了现有的基于动态信任的任务调度模型,分析了经典调度模型中没有考虑任务大小、执行期限和计算冗余组计算能力等缺点.在经典模型的基础之上,提出了一种在BOINC系统中适用于独立计算任务的基于动态信任的分布式任务调度改进模型.该模型对经典模型中可靠度的定义作了优化,并且考虑了任务大小、执行期限、计算冗余组计算能力等因素,从而提高了计算的吞吐量,减少了计算时间.     

一种基于异构系统的实时调度算法研究

高效调度是异构系统中实现高性能计算的关键.调度问题已经被证明是NP完全问题,由于其关键性,调度问题已经被国内外研究机构广泛研究,并提出了多种算法.尽管在一些文献中提出了异构多处理器的调度算法,但是这些算法的调度成本较高,并且在较低的调度成本下无法提供高质量的调度.本文提出一种最小评分优先算法(HMSF),该算法是一种适用于异构系统的高性能、快速调度算法,通过和传统的HEFT算法和DLS算法进行试验对比发现,HMSF算法可以使调度长度更短.     

应用混合蚁群算法求解并行批处理机组批与调度问题

晶圆制造系统的批处理机具有长加工时间的特征,其调度性能指标对车间总体绩效有重要影响.批处理机调度分为组批与批次调度.针对工件的动态到达特性导致组批困难,提出了一种混合型蚁群算法.利用该算法的全局并行搜索能力对工件进行组批,并使用BATC算法对批次进行调度,可以解决多产品并行批处理机调度问题.以工件总拖期最小为性能指标,通过实例仿真,对蚁群算法性能进行分析评价和比较.结果表明,所提出的算法具有有效性和实用性.     

Hadoop平台下基于资源预测的Delay调度算法

针对Delay算法的不合理等待问题, 提出一种基于资源预测的Delay调度算法（RFD）, 该算法基于对资源可用性的预测方法合理地调度作业. 实验结果表明, 在Hadoop机群一般应用场景下, 该调度算法与已有算法相比, 在保证作业本地化计算Map任务比例相近的同时, 将作业平均运行效率提高28.8%, 明显提高了Mapreduce作业的执行效率.     

进化规划方法在并行多机调度问题中的应用

并行多机调度问题是一类重要的车间调度问题,但迄今为止,在解决工件和机器数较多的大规模并行多机调度问题还存在着许多困难。进化规划方法与遗传算法一样是一种重要的进化计算方法,但与遗传算法相比,进化规划算法的应用还刚刚开始,特别是在调度领域的应用还很少见文献报道,第一次将进化规划方法应用到并行多机调度问题中,并在问题的描述、可行解的表示、变异方法、提高进化规划方法的局部寻优能力等方面作了研究。不同规模的计算实例表明了本文提出的进化规划算法是有效的,能用于解决较大规模并行多机调度问题,且解的质量优于启发式算法和模拟退火算法。     

一种异步蚁群算法求解柔性作业车间调度问题

调度问题广泛存在于资源共享型系统中,大多数的调度问题都属于混合整数规划问题.大规模混合整数规划问题是计算科学领域中的NP-hard经典问题之一,一般认为无法用精确计算求解.生产调度是调度的一个重要分支,是实现智能制造关键环节之一.针对多品种变批量柔性作业车间调度问题,以最小制造期为优化目标,设计了一种基于Petri网的异步并行蚁群算法,其中:提出了一种基于Petri网的步可达图构造方法,用于蚁群算法解空间的构造;探讨了传统蚁群算法搜索机制,并给出了一种基于异步仿真时钟的蚁群并行搜索方法;仿真结果表明,多线程控制方法可以有效地避免算法的早熟收敛问题.将所提出的算法应用于某安防件智能制造系统的柔性作业车间调度中,降低了系统的总制造时间,获得较好工程效果的同时验证了算法的有效性.     

求解混合Flowshop调度问题的简化禁忌搜索方案

针对 HFS系统的最小化 Makespan调度问题 ,提出一种禁忌算法和优先级规则相结合的方案 :采用改进的 RA算法对第 1级工件进行排序 ,并用禁忌搜索对其进行优化 ;采用 FAM算法给工件分配设备 ,其他级工件的排序采用最大剩余时间优先级规则 .和其他 HFS的局部搜索算法相比 ,该方案大大缩减了搜索空间 .仿真结果表明 ,该方法能够较好地解决 HFS调度问题 .     

基于粒子群算法的物流配送车辆优化调度研究

应用粒子群算法求解物流配送系统的车辆优化调度问题,针对车辆调度问题中需要考虑车辆容量和车辆行驶路径的限制等要求,提出一种基于收货点、粒子位置次序和粒子位置取整操作的三维粒子编码方法,采用惯性权重线性递减粒子群算法对两个算例进行计算,并与遗传算法的计算结果进行了比较.结果表明,粒子群算法能够有效地对物流配送车辆调度问题进行优化.     

面向QOS的DVB-C2两级自适应调度模型与算法

传统的调度算法大都是在链路容量恒定的情况下,考虑如何保证业务的时延、带宽等QoS要求,而DVB-C2系统采用了ACM技术,链路容量是可变的,且其数据的调度对系统的传输效率和吞吐率有一定影响.为了在链路容量变化的前提下,满足业务QoS需求同时,尽可能提高DVB-C2系统的传输效率与吞吐率,针对DVB-C2系统的特点,提出了一种应用于DVB-C2的两级调度模型,并在该模型的基础上,提出了相应的自适应调度算法.实验表明,该模型与算法适用于链路容量变化的场景,与传统调度算法相比,更好地保证了业务的时延需求,具有更高系统传输效率,提升了系统的吞吐率.     

炼钢连铸系统的动态调度模型和启发式调度算法

针对炼钢连铸系统对单元设备建立了动态调度模型,并利用基于该模型的赋时同步有色Petri网对整个系统建立动态调度模型,针对该模型,提出了一种启发式调度算法解决动态调度问题,并基于此实现炼钢连铸的仿真调度系统,结果表明,该算法能够较好地实现多级多机FIFO（先入先出）系统的动态调度问题。     

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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