基于改进细菌觅食算法的容器云多维资源均衡调度

针对容器云平台默认的资源调度方式效率低等多种问题,引入改进细菌觅食算法,设计了一种新的容器云多维资源均衡调度方法.通过增加优选调度流程的方式对容器云平台调度方式进行优化,以此构建容器云多维资源调度模型,采用改进的细菌觅食算法优化求解资源调度模型,得到最优解,使得资源利用更充分、资源调度更均衡.实验结果表明,该方法的收敛速度更快,任务完成时间更短,负载均衡度更高,可以提高容器云多维资源调度过程中的集群资源利用率,保证调度负载均衡性.     

一种基于粒子群优化的虚拟资源分配方法

针对云计算环境下存在虚拟化资源利用率不高?延迟?性能衰减等问题,提出一种基于粒子群的虚拟资源分配优化方法?根据云计算优势,对虚拟化资源 进行描述及状态定义,分析了虚拟环境下的服务质量(quality of services,QoS)组成和计算方法;同时通过用户与云提供商收益最大化的平衡关系,建立一种虚拟化操作方法,以确保虚拟化资源被合理分配和回收;采用粒子群算法使用户和虚拟服务提供方都能趋于收益平衡?在此基础上设计的一款云播放器与直接嵌入到Web播放器相比得出,提出的粒子群优化方法有效且将资源利用率至少提高10%,与QoS约束的二元整数规划方法相比,提出的方法操作虚拟资源更有效?     

基于效益分析的云平台资源弹性伸缩方法

针对构建弹性云平台的关键问题展开研究,从提升系统负载自适应能力与资源利用率角度,提出一种基于效益分析的面向作业需求的细粒度云平台资源弹性伸缩方法.为最大化系统可伸缩性,消除集中式集群单点限制,采用资源分层管理策略,实现集群内垂直伸缩与集群间水平伸缩相融合的弹性资源管理架构;为提高系统资源利用率,克服虚拟机方案的资源浪费问题,采用轻量级虚拟化容器,实现面向作业的细粒度资源分配;为保证系统动态资源调整的实时性,避免滞后效应,采用效益预估方法,实现资源预分配并兼顾负载均衡.理论分析与仿真实验表明,本方法能有效实现云平台资源弹性伸缩,减少作业等待时间,并显著提升系统资源利用率.     

容器虚拟化技术在机构知识库系统中的探索实践

通过采用容器虚拟化技术Docker,解决机构知识库系统快速安装部署、平滑升级和云服务平台建立的问题.以北京工业大学机构知识库建设为例,提出机构知识库建设Docker虚拟化解决方案,将机构知识库系统容器化、镜像化,以此构建机构知识库云服务平台,并进行快速分发应用.Docker容器虚拟化技术在机构知识库中的运用,能够加快机构知识库的推广应用,降低维护、升级成本,提高工作效率.     

企业级混合式虚拟云平台建设的思考

<正>虚拟化技术在企业IT应用中已经成为大势所趋,但是在各个企业选择上往往趋向于选择服务器虚拟化或者桌面虚拟化中的一种,本文探讨的混合虚拟化云平台是指包含服务器虚拟化、桌面虚拟化和网络虚拟化为一体的整体性混合虚拟化云平台建设思路。1虚拟化技术简介虚拟化技术是通过资源池化的方法,可将多个物理机以及多个存储组建资源集群,在此基础上进行物理资源的两次抽象处理,形成可以供各类操作系统使用的虚拟硬件资源,在此基础上建立服务器和桌面操作系统,部署各种服务应用,比如:软件定义的数据中心,虚拟网     

联盟模式下云资源提供最优化算法

为了提高资源利用率和云资源提供者的收益,提出一种云联盟模式下基于合作博弈的资源提供算法.算法将资源联盟收益最优化形式化为线性规划问题,通过合作博弈核求解了该收益最优化问题,并证明了处于合作核中的资源提供策略同样是线性规划最优解.进一步,为了获得稳定的资源联盟结构,设计了基于离散Markov链的动态联盟构造模型,通过该模型可以得到收益最大化的最优联盟结构.仿真实验结果表明,对于具有博弈理性的资源提供者而言,资源联盟可以有效提高个体资源提供者的收益,同时,由于结盟代价的存在,稳定的联盟结构更加倾向于形成规模更小的联盟.     

VXLAN网络技术研究

随着云计算技术迅速而全面的推广和应用,传统的数据中心逐渐向由各种虚拟化技术所支撑的云数据中心转变。计算虚拟化和存储虚拟化已经取得长足发展,但网络虚拟化一直是云业务资源虚拟化的短板。VXLAN能够在传统物理网络基础上构建逻辑的二层网络,提供了网络虚拟化的有效解决方式,是网络支持云业务发展的理想选择。该文对VXLAN技术进行了分析研究,并探讨了其部署方法、优势及不足。     

云制造资源的虚拟化与服务化

为了完整地描述云制造资源的属性,实现云制造资源物理-虚拟资源的映射与转化,结合云制造服务体系框架、云制造资源的特点及分类,指出了云制造资源虚拟化的原则——系统性、针对性、适应性、扩展性、接口统一和动态性;然后以制造设备资源为例,描述特征模型,并通过扩展开源软件CloudSim Java类给出了制造设备资源虚拟化模板;最后以零件加工为例,利用Tuscany SCA对已虚拟化的制造设备资源进一步服务化形成云服务,并将云服务发布到服务注册中心,供云制造资源使用者查找和调用.     

云制造中加工设备资源语义模型研究

为了解决云制造环境下加工设备资源的虚拟化封装问题,建立了一种开放的、柔性的加工设备资源模型。在深入解析制造资源内涵、分类、特性的基础上,分析了加工设备资源的特点,结合语义知识和WEB技术,建立了加工设备资源模型。给出了加工设备资源语义描述方法,建立了描述模板。最后详述了云制造资源匹配流程,为云制造平台资源管理提供了重要基础和条件。     

云制造环境下基于本体的资源虚拟化方法

针对云制造环境下资源的描述及虚拟化问题,分析了现有文献存在的局限性,充分考虑了云制造中制造资源的分类和特点,分析了资源描述及虚拟化需求,提出了基于本体的资源描述及虚拟化方法.在本体开发过程中,通过分析比较现有本体描述语言的优缺点,选用了有较好综合性能的OWL-S,建立了制造资源本体模型.在此基础上,给出了虚拟资源的定义,并描述了其与制造资源本体的关系.最后,通过一个基于本体描述的虚拟资源查找和调度的应用案例,验证了本文所提的资源描述及虚拟化方法的正确性.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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