阶段并行模型上的并行算法设计

阶段并行模型是BSP(Bulk Synchronous Parallel)模型的改进,它更接近于表述实际的机器行为,同时具有编程简单、独立于系结构和执行性能可预测等特点.NOWs正成为并行计算领域的一个新的发展热点,以太网构成的微机集群系统是NOWs的一种重要实现形式.研究了群集系统中分阶段并行模型上的并行算法设计,以FFT算法为例,进行了设计和分析,并给出了测试结果.     

阶段并行模型上的并行算法设计

阶段并行模型是BSP（Bulk Synchronous Parallel）模型的改进,它更接近于表述实际的机器行为,同时具有编程简单、独立于体系结构和执行性能可预测等特点。NOWs正成为并行计算领域的的一个新的发展热点,以太网构成的微机集群系统是NOWs的一种重要实现形式,研究了群集系统中阶段并行模型上的并行算法设计,以FFT算法为例,进行了设计和分析,并给出了测试结果。     

可扩充计算年度综述

本书是《可扩充计算》丛书的第5卷。全书是由4篇综述组成的。第1篇不规则算法的并行计算策略，考虑了三个具有代表性的不规则应用；无结构重啮合、稀疏矩阵计算和N体问题。第2篇在群与网格上的大规模不规则计算的实时支持，介绍了一个正在形成的计算基础结构——在计算群集和计算网格上实施不规则数据密集应用的一种综合方法，即想法、技术、概念及软件结构；提出了并行化策略和一个叫做lib的运行时程序库，该程序库支持不规则与缺乏核心的计算，并且介绍了在安装有建立于lib基础上的软件的PC以及工作站群集所获得的试验执行结果。     

关于并行计算的若干问题

并行计算是计算机发展方向之一 ,对并行计算的基本情况做出分析是必要的。在此讨论了并行计算产生的背景、并行计算模型、并行计算存在的问题与当前研究热点等。     

非生物灾变事件的生物圈效应群集消失与群集出现

通过分析地球历史上的非生物灾变事件和生物事件发现,群集出现常伴随着群集消失,这可见于显生宙许多纪间界线附近,那里往往存在着地球灾变的标志。如同群集消失多由地球灾变引起一样,地球灾变亦是群集出现的一个重要动因。在灾变期,地球表层一般可分为非灾变区、边缘灾变区和中心灾变区。非灾变区生物以背景消失和背景出现为主,中心灾变区一般以群集消失尤其是群集绝灭为主,而边缘灾变区则既有群集消失又有群集出现尤其是群集起源,是进化的活跃地区,且其进化可称为巨进化。     

具有动态拓扑有领航者的多智能体群集运动控制

对具有二次积分的动态多移动智能体在动态拓扑下跟随领航者取得群集运动编队进行了研究.引入了光滑的邻接矩阵以及光滑的势场函数,提出了多移动智能体群集运动的光滑控制器设计方法,运用现有群集运动理论和经典的李雅普诺夫稳定性理论,证明了多移动智能体系统群集运动的稳定性.分析表明:智能体网络在切换的情况下,该方案设计得到的控制输出仍然是光滑的,最终智能体群在领航者的带领下取得群集运动.计算机仿真实例验证了所得结论.     

群集技术在图书馆网络建设中的应用

论述了群集技术及其工作原理，以LEGATO AAM群集软件为例，详细介绍了群集技术在图书馆网络建设中的应用。     

大数据环境下并行计算模型的研究进展

在大数据时代,制约并行计算发展的掣肘正在发生改变,为分布式并行计算带来了前所未有的机遇和挑战.回顾了并行计算的发展和大数据环境下的新变化;结合硬件环境、计算模式、以及应用需求等对于并行计算模型研究的影响,综述了面向批处理、面向流处理、面向图数据以及面向内存等几类并行计算模型的相关研究;展望了其发展趋势.     

一种高效的无线传感器网络自组织聚类算法

提出了在无线传感器网络(WSN)中一种高效的自组织聚类算法。该算法随机产生群集,并根据传感器的权重选择簇头的。首先产生,并根据密度以及剩余能量计算每个传感器的权重。选择权重最大的作为该群集的簇头。其次,当群集大小低于某个阈值时,需要重新组织群集并重新选择簇头。仿真结果证明,该算法能够均匀的分布传感器能量消耗,从而延长了传感器网络的生命周期。     

搭建服务器集群实现网络的稳定

在网站上采用创建群集的方法来减轻压力,达到访问的顺畅,提高服务的可用性和可靠性.本文采用在Windows Server 2008服务器上创建群集网络负载平衡(NLB)群集和故障转移群集,实现网络的稳定.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to