基于SIMD架构的相干累加运算优化方法

针对软件GPS接收机在处理高数据流时存在的实时性问题,提出一种基于单指令多数据流(SIMD)架构的相干运算优化方法。分析跟踪环路结构、SIMD指令与相干积分累加运算量,使用多媒体扩展指令集对流水线进行优化。实验结果表明,完成1 s数据的相干积分累加计算时间为0.7 s,该运算量仅为使用普通单指令多数据流指令的6.5%,具有较高的实时性。     

基于网络环境的智能计算机辅助教学系统的研究

文章对比了CAI与ITS的优劣,概述了基于网络环境的智能计算机辅助教学系统的设计,旨在为提高计算机辅助教学水平服务。     

微处理器Cache的验证方法研究

在微处理器功能验证中,由于高速缓存(Cache)是软件(即测试程序)不可见的,对其进行芯片级验证难以获得高的可控制性(测试场景构造)和可观测性(验证结果检测)。基于此,提出通过验证平台调用的方法,为软件提供服务和管理Cache,构造测试场景。采样由Cache引起的微处理器系统总线行为检测验证结果。实验结果表明,该方法方便测试程序开发,减少验证时间。     

Comparisons of air traffic control implementations on an associative processor with a MIMD and consequences for parallel computing

This paper has two complementary focuses. The first is the system design and algorithmic development for air traffic control (ATC) using an associative SIMD processor (AP). The second is the comparison of this implementation with a multiprocessor implementation and the implications of these comparisons. This paper demonstrates how one application, ATC, can more easily, more simply, and more efficiently be implemented on an AP than is generally possible on other types of traditional hardware. The AP implementation of ATC will take advantage of its deterministic hardware to use static scheduling. The software will be dramatically smaller and cheaper to create and maintain. Likewise, a large AP system will be considerably simpler and cheaper than the MIMD hardware currently used. While APs were used for ATC-type applications earlier, these are no longer available. We use a ClearSpeed CSX600 accelerator to emulate the AP solutions of ATC on an ATC prototype consisting of eight data-intensive ATC real-time tasks. Its performance is compared with an 8-core multiprocessor (MP) using OpenMP. Our extensive experiments show that the AP implementation meets all deadlines while the MP will regularly miss a large number of deadlines. The AP code will be similar in size to sequential code for the same tasks and will avoid all of the additional support software needed with an MP to handle dynamic scheduling, load balancing, shared resource management, race conditions, false sharing, etc. At this point, essentially only MIMD systems are built. Many of the advantages of using an AP to solve an ATC problem would carry over to other applications. AP solutions for a wide variety of applications will be cited in this paper. Applications that involve a high degree of data parallelism such as database management, text processing, image processing, graph processing, bioinformatics, weather modeling, managing UAS (Unmanned Aircraft Systems or drones) etc., are good candidates for AP solutions. This raises the issue of whether we should routinely consider using non-multiprocessor hardware like the AP for applications where substantially simpler software solutions will normally exist. It also raises the question of whether the use of both AP and MIMD hardware in a single hetergeneous system could provide more versatility and efficiency. Either the AP or MIMD could serve as the primary system, but could hand off jobs it could not handle efficiently to the other system.     

计算机设计类课程的项目化教学探讨

项目化教学是一种不同于传统讲授的教学方式,它通过项目实践来组织课堂教学,适合于计算机设计类课程。对项目化课程教学的一些关键问题进行探讨分析,包括选题引导、项目分析、过程管理和课程考核。实践表明,项目化教学可有效提高学生的项目分析能力和技术应用水平,教学效果良好。     

首要教学原理在高职《C语言程序设计》教学中的应用探讨

针对高职《C语言程序设计》理论深、实践性强,采用传统教学方法效果不明显的情况,尝试着把首要教学原理引入到实际教学中,通过具体的教学案例,给出首要教学原理在《C语言程序设计》课堂教学中的实施过程,为高职课程改革进行有益的探索。     

基于CAD模型的冲压指令编程方法

介绍了在钣金制件展开、开孔后的CAD图形模型上，通过人机交互方式选择图素，编制数控冲压指令程序，以及关于冲压模具和运动轨迹优化冲压指令程序的方法。     

The effects of training wheels and self‐learning materials in software training

Abstract The role of software training is becoming increasingly important due to the growing variety and complexity of modern software products. This paper focuses on the effectiveness and feasibility of two different kinds of individual learners' support in software training in classroom settings. This research question was investigated by analysing 11 text‐processing courses which were conducted on the basis of a quasi‐experimental research design. Firstly, the user interface was varied, i.e. half of the courses used the regular standard user interface of the software, whereas the other half used a training wheels interface in which all irrelevant functions were blocked. Secondly, in half of the courses all instruction was given by a human tutor whereas the participants in the other half received written self‐learning material. A total of 72 university students majoring in different fields participated. Dependent measures were learning time, learning outcome, and learner satisfaction.     

非化学化工类化学复习系统的CAI功能设计

阐述了计算机辅助非化学、化工类化学课题复习系统的设计思想、开发策略、开发途径及系统功能。     

PLC定时器在双速电梯端站保护中的应用

交流双速电梯的端站保护是十分重要的。为提高其安全性采用可编程序控制器(PLC)中程序定时的功能进行强化保护,并通过 PLC 的自诊断功能简化故障检修的步骤,提高检修效率,从而更好的保证工、矿企业的安全生产。