多核并行计算下的流量传感器流场模拟研究

多核并行小型集群系统给流量传感器流场模拟应用提供了方便可行的条件,文章将通过建立一个多核并行小型集群仿真系统为例来讨论多核并行计算对流量传感器流场模拟的支持,对其进行了测试,并实现了管道流量传感器流场的CFD模拟,取得较好结果。通过测试表明,我们的多核并行集群可扩展性能好,具有较高的并行计算性能,能满足一般并行计算的需要。     

GIS高性能空间分析研究进展

伴随着多核计算平台的发展和地理空间信息的爆炸性增长,并行地理信息系统（GIS）的时代已经到来。空间分析是GIS的核心,其性能直接制约着GIS软件的竞争力。多核计算环境为空间分析技术的发展提供了新的机遇,依据空间分析的5个功能领域逐个探讨其在高性能环境下的并行算法复杂度和空间资源组织复杂度,以揭示在各个功能上的并行化的主要问题和挑战。     

软件事务存储系统设计选择

多核微处理器的发展为线程级并行编程带来了新的机遇和挑战。面对传统锁机制应用对并行开发带来的诸多困难,借鉴数据库中事务的概念提出事务存储技术。软件事务存储系统的性能受设计上各方面因素的影响,比如基于字或基于对象、基于锁或无阻塞、直写或回写、早检测或晚检测。对此进行了论述。     

VLSI技术与并行计算机体系结构趋势

随着IC技术的发展,并行计算技术从位级并行到多处理器并行和PAM的出现,为并行计算机体系结构的发展带来新的机遇。本文从技术角度,回顾了并行计算机体系结构的发展历程及趋势。     

Java多线程技术应用研究

探讨了在多核处理系统应用多线程技术的重要意义和价值.然后阐述了进程和线程的相关理论.先以JDK1.4.2为基础介绍了Java多线程机制,再以JDK1.5中的并行工具包开发库JSR-166,给出了多线程应用的Java解决方案.     

VLSI技术与并行计算机体系结构趋势

随着IC技术的发展，并行计算技术从位级并行到多处理器并行和PAM的出现，为并行计算机体系结构的发展带来新的机遇。本文从技术角度,回顾了并行计算机系结构的发展历程及趋势。     

基于MPI与OpenMP混合并行计算技术的研究

针对多核机群系统的硬件体系结构特点,提出了节点间MPI消息传递、节点内部OpenMP共享存储的混合并行编程技术。该编程模型结合了两者的优点,更为有效地利用了多核机群的硬件资源。建立了单层混合并行的Jacobi求对称矩阵特征值算法。实验结果表明,与纯MPI算法相比,混合并行算法能够取得更好的加速比。     

基于MPI与OpenMP混合并行计算技术的研究

针对多核机群系统的硬件体系结构特点,提出了节点间MPI消息传递、节点内部OpenMP共享存储的混合并行编程技术。该编程模型结合了两者的优点,更为有效地利用了多核机群的硬件资源。建立了单层混合并行的Jacobi求对称矩阵特征值算法。实验结果表明,与纯MPI算法相比,混合并行算法能够取得更好的加速比。     

桌面遥感图像处理系统并行处理架构选择与实验分析

介绍了桌面遥感影像处理系统对高性能计算的需求及其现状,针对多核CPU与GPU这两种当前单机系统中最重要计算资源的结构与功能差异,总结不同并行架构所具有的运算特点及适用范围,以遥感影像多项式几何校正为例,对比分析了同时代多核CPU与GPU在进行高计算密集度且运算逻辑较简单算法的高性能处理之间的性能差异,探讨了并行处理架构选择的实践准则。     

流量牵引技术在DDOS攻击中的应用

网络安全技术随着信息技术的发展而日新月异，许多安全技术成并行发展．现在网络安全领域又出现了一个新技术——流量牵引技术，本文对流量牵引的内含，为什么要使用流量牵引技术等相关知识进行详细的介绍。     

Longitudinal investigation of the curricular effect: An analysis of student learning outcomes from the LieCal Project in the United States

In this article, we present the results from a longitudinal examination of the impact of a Standards-based or reform mathematics curriculum (called CMP) and traditional mathematics curricula (called non-CMP) on students’ learning of algebra using various outcome measures. Findings include the following: (1) students did not sacrifice basic mathematical skills if they are taught using a Standards-based or reform mathematics curriculum like CMP; (2) African American students experienced greater gain in symbol manipulation when they used a traditional curriculum; (3) the use of either the CMP or a non-CMP curriculum improved the mathematics achievement of all students, including students of color; (4) the use of CMP contributed to significantly higher problem-solving growth for all ethnic groups; and (5) a high level of conceptual emphasis in a classroom improved the students’ ability to represent problem situations. (However, the level of conceptual emphasis bears no relation to students’ problem solving or symbol manipulation skills.)     

Characterising the development of the understanding of human body systems in high-school biology students – a longitudinal study

ABSTRACT

Science education today has become increasingly focused on research into complex natural, social and technological systems. In this study, we examined the development of high-school biology students’ systems understanding of the human body, in a three-year longitudinal study. The development of the students’ system understanding was evaluated using the Components Mechanisms Phenomena (CMP) framework for conceptual representation. We coded and analysed the repertory grid personal constructs of 67 high-school biology students at 4 points throughout the study. Our data analysis builds on the assumption that systems understanding entails a perception of all the system categories, including structures within the system (its Components), specific processes and interactions at the macro and micro levels (Mechanisms), and the Phenomena that present the macro scale of processes and patterns within a system. Our findings suggest that as the learning process progressed, the systems understanding of our students became more advanced, moving forward within each of the major CMP categories. Moreover, there was an increase in the mechanism complexity presented by the students, manifested by more students describing mechanisms at the molecular level. Thus, the ‘mechanism’ category and the micro level are critical components that enable students to understand system-level phenomena such as homeostasis.     

过程管理在汽车玻璃钢化风栅制造中的应用

为解决采用传统串行过程进行汽车玻璃钢化风栅生产过程中周期长、效率低的问题，研究了把并行工程思想引入钢化风栅设计制造过程的方法。首先在汽车玻璃钢化风栅生产过程的基础上，阐述了钢化风栅方案设计的并行思想。以组合结构钢化风栅为例，研究了应用并行工程过程管理思想进行该类型模具设计制造中的过程分解、过程评估和质量保汪等问题。实践表明，应用并行工程中的过程管理方法对钢化风栅研制过程进行规划，生产效率约提高15％。     

Impact of curriculum reform: Evidence of change in classroom practice in the United States

The purpose of the study reported in this article is to examine the impact of curriculum on instruction. Over a three-year period, we observed 579 algebra-related lessons in grades 6-8. Approximately half the lessons were taught in schools that had adopted a Standards-based mathematics curriculum called the Connected Mathematics Program (CMP), and the remainder of the lessons were taught in schools that used more traditional curricula (non-CMP). We found many significant differences between the CMP and non-CMP lessons. The CMP lessons, emphasized the conceptual aspects of instruction to a greater extent than the non-CMP lessons and the non-CMP lessons emphasized the procedural aspects of instruction to a greater extent than the CMP lessons. About twice as many CMP lessons as non-CMP lessons were structured to use group work as a method of instruction. During lessons, non-CMP students worked individually on homework about three times as often as CMP students. When it came to text usage, CMP teachers were more likely than non-CMP teachers to work problems from the text and to follow lessons as laid out in the text. However, non-CMP students and teachers were more likely than CMP students and teachers to review examples or find formulas in the text. Surprisingly, only small proportions of the CMP lessons utilized calculators (16%) or manipulatives (11%).     

探究提高数控加工技术水平的有效策略

随着科学技术的不断发展,我国数控加工技术也得到了快速发展,数控加工技术已经广泛应用于机械制造行业,相比传统普通机床加工技术而言,数控加工技术能够快速高效地完成机械加工。但是,就我国目前的数控加工技术而言,与国际先进水平依然存在着一定的差距,需要不断地完善。对于机械加工企业来说,数控加工技术水平决定整个企业的生产水平,因此探究提高数控加工技术水平的有效策略,有较强的现实意义。     

关于理工类高校建设与发展的若干思考

科技创新与学科建设是高等学校建设与发展中的核心工作,是提高高等学校教学、科研、社会服务能力与水平的基础。本文论述了理工类高等院校的发展现状,并就理工类高等院校在科技创新、学科建设方面存在的一些问题进行探讨,认为理工类高等院校应当在发展中抓住重点,办出特色,加强优势学科科技创新能力,并提高科研产出质量,走内涵发展的道路。     

我们在何种意义上谈论马克思是否为技术决定论者

在看待马克思是不是技术决定论者的问题上,首先要界定谈论的问题域.生产力决定生产关系,不能简单地替换为技术决定生产关系;马克思认为社会形态取决并适应于技术发展水平,强调了恰恰是生产关系要适应于生产力发展的要求,这里的技术与技术决定论的技术有着不同的语境.认为马克思是技术决定论者,只有在特殊的语境下,才可以进行这样的阐释.     

财经类省级重点实验室建设的探讨

从财经类高校重点实验室建设定位、实验室开放、师资队伍建设和实验室管理的角度来探讨如何加强重点实验室的建设,促进财经类高校科研体系的全面发展,提高科技创新水平和科技竞争力。     

浅谈现阶段档案工作规范化标准化的建设

随着信息时代和网络技术的发展,档案信息资源的开发和利用越来越受到重视,但是现阶段档案工作中存在有不利于档案的提供和利用的问题。本文为档案实现信息化服务、提高档案管理水平,使档案工作重新具有新的活力和价值提出一点建议。