基于QoS约束的计算能力调度算法研究

云计算具有很强的商业性特点,以为用户提供高质量的服务为目标。针对云计算对服务质量QoS的需求问题以及云计算原有计算能力调度算法没有考虑用户多样性的缺点,提出了基于QoS约束的计算能力调度算法。该算法可以在保证为用户提供模拟的独立计算能力基础上,根据QoS参数生成的向量进行资源与任务的匹配,区分用户的不同服务质量需求,为用户提供符合其需求的资源。     

基于带宽约束的云计算负载调度算法

负载调度是云计算得以大规模应用及提高服务性能的关键技术,对提高云供应商服务质量、用户满意度以及数据中心集群资源利用率等有极其重要的意义.云计算环境中,由于用户任务类型的不同,对带宽的需求也不尽相同,若不区分不同任务对不同带宽的要求,可能会造成资源的浪费,增长用户等待时间.本文对经典Min-Min算法进行改进,提出了BCLL-Min-Min算法,该算法满足带宽需求约束,并且实现相对负载均衡调度.仿真实验表明,BCLL-Min-Min算法能够适应云计算环境下任务多样性和不确定性的情况,使用该调度算法可以提高集群的吞吐率、较大改善数据中心的负载均衡性.     

一种加权欧氏距离负载均衡云任务调度算法

云计算通常需要处理大量的计算任务,任务调度策略在决定云计算效率方面起着关键作用。本文提出一种加权欧氏距离负载平衡(EDW-LB)的任务调度解决方案。仿真结果表明:该方法能够在保证任务完成时间的条件下,通过新的任务调度策略来提高用户对云计算任务的满意度以及资源的利用率,是一种云计算环境下有效的任务调度算法。     

基于博弈的云计算任务分解研究

云用户在同时拥有本地资源和云计算资源时,如何在二者之间进行任务分解,以最短化任务完成时间是云用户的一个优化决策问题。研究云用户的最优任务分解决策。针对云计算资源的共享特征,用户之间的决策会影响其余用户的任务完成时间;因此通过求解纳什均衡的方法来分析用户的策略行为,从而决定用户的最优决策。求解了大任务和小任务两类用户时的纳什均衡,并通过仿真给出了在不同大小任务量比、云资源本地资源速度比和大任务用户概率时云用户的最优决策。     

基于风险的云计算环境用户效用分析

通过分析云计算环境中资源分配和用户任务请求的过程,提出了云计算环境中的用户效用函数,并引入风险对云计算服务和资源由于被非授权访问造成的损失进行量化,得出了基于风险的用户期望效用函数.最后,通过仿真实验论证了任务执行数与用户需求,时间,费用和用户效用之间的关系.从仿真实验可以看出,用户的一次提交的任务数存在一个理想值,在...     

基于Stackelberg博弈的资源动态定价策略

针对计算密集型任务卸载时边缘云计算能力有限引起的公平性问题,提出一种基于Stackelberg(斯坦克伯格)博弈的资源动态定价策略.首先,分析边缘云系统资源剩余量和用户需求之间的实时关系,设计边缘云网络收益及用户成本函数.然后,通过验证用户之间非合作博弈纳什均衡点的存在性,获得基于完全状态信息下用户成本最低时的最优卸载策略.最后,采用双向迭代搜索算法求解边缘收益问题,获取经价格调整因子调节后的边缘云网络最优定价策略.仿真结果表明:所提算法当计算资源较少时能保证边缘云收益,并在保证用户公平性前提下提高用户服务质量.     

面向领域的软件构件资源“云”建设研究

领域工程产生的大量可复用的软件构件资源是支持规模化软件复用的关键软件资产,基于可复用软件构件进行的构件化开发是降低软件开发成本、提高软件质量、应对需求变化、实现快速交付的重要手段。利用云计算技术的虚拟化、弹性计算、按需服务等优势建设面向领域的软件构件资源"云"平台,有助于提高领域构件资源利用的广泛性和有效性。     

基于改进萤火虫算法的云计算任务调度策略

针对云计算中任务调度效率低引起的资源利用不平衡问题,提出一种基于改进萤火虫算法的虚拟机任务调度策略,该策略首先构建云计算资源负载平衡优化问题的约束条件,采取最小用户任务完成时间作为资源优化的目标函数;其次通过改进的萤火虫算法优化资源搜索路径,优化云服务器中多个虚拟机之间的任务负载平衡,通过提高云服务器的响应效率达到缩短用户任务完成总时间的目的.实验结果表明:相比于其他算法,本文提出的策略在云计算任务完成时间方面具有明显优势,能够有效地解决服务器中的负载不平衡问题,提高用户请求的响应效率.     

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.     

光时分复用器的设计

光时分复用器是光时分复用技术的核心器件,只有性能优良的时分复用器才能保证复用后的信号质量。设计了一种典型的4路信号光时分复用器,探讨了光延时线损耗对系统各支路性能的影响。对耦合器不同分光比下各支路信号的功率均衡进行了计算,分析了各支路光纤长度误差对延时范围的影响,模拟了在特定长度基准光脉冲信号的前提下,系统可实现的复用范围,对构建光时分复用系统具有重要的意义。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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