A study of machine-level software profile

The instruction mix of a CDC CYBER/74 computer in a university environment was monitored, and in this paper frequencies of execution for the most commonly used instructions are given. From these measurements we make a number of observations about several aspects of computing patterns. One observation is the fact that if we exclude the idle loop of the operating system, the percentage of occurrences for each type of instruction over various time intervals is constant. This fact is used to define a machine-level software profile (MLSP) for the type of machine operations in the given computing environment. It is shown that the MLSP could be used to find machine utilization and the extent to which software takes advantage of machine architecture, and as a consistent method to improve the performance of a machine configuration.     

插补法CAI研究

数字程序控制计算机辅助教学是将计算机技术用于数字程序控制的教学过程，它帮助学生学习并模拟教学实验．本文介绍了数字程序控制中直线插补和圆孤插补的ＣＡＩ实现方法．     

基于哈萨克文的辅助教学软件的设计与实现*

随着计算机技术的不断发展,计算机辅助教学得到越来越广泛的应用,因此出现各种计算机辅助教学软件。重点介绍哈萨克文辅助教学软件的设计、工作流程,以及简要说明该辅助教学软件的主要模块及实现方法。     

Modeling And Performance Evaluation Of Branch And Value Prediction In Ilp Processors

Speculative execution is one of the key issues to boost the performance of future generation microprocessors. In this paper, we introduce a novel approach to evaluate the effects of branch and value prediction, which allow the processor to execute instructions beyond the limits of control and true data dependences. Until now, almost all the estimations of their performance potential under different scenarios have been obtained using trace-driven or execution-driven simulation. Occasionally, some simple deterministic models have been used. We employ an analytical model based on recently introduced Fluid Stochastic Petri Nets (FSPNs) in order to capture the dynamic behavior of an ILP processor with aggressive use of prediction techniques and speculative execution. Here we define the FSPN model, derive the state equations for the underlying stochastic process and present performance evaluation results to illustrate its usage in deriving measures of interest. Our implementation-independent stochastic modeling framework reveals considerable potential for further research in this area using numerical solution of systems of partial differential equations and/or discrete-event simulation of FSPN models.     

Role of formal instruction and informal practice in learning to drive

Abstract

Learning to drive a motor vehicle is important for the mobility of the majority of people in industrialized countries. Although a great deal is known about the acquisition of psychomotor skills in the laboratory and in some other practical settings, there has been little scientific study of learning to drive. One major practical question concerns the value of formal tuition with a qualified instructor and informal practice with friends or relatives. This paper reports a cross-sectional study of 805 learner drivers in the UK who had undergone at least 5 h of formal tuition to examine associations between their history of formal tuition and practice and current levels of skill and confidence as assessed by both pupils and their instructors. The results indicated an increase in instructor ratings of pupil skill with both increasing practice and tuition. However, the relationship between tuition and instructor-rated skill was only observed in pupils who had had no practice. Pupils' self-confidence did not increase with either tuition or practice; instructors' feelings of confidence in and safety with the pupil increased with pupils' prior hours of practice but not tuition. Instructors' ratings of the likelihood that pupils would pass the driving test first lime were positively associated with prior hours of practice and negatively associated with prior formal tuition. The results suggest that informal practice constitutes an important element of the process of learning to drive. Longitudinal and experimental studies are now required to confirm this finding and to establish whether recommendations should be made for a component of driving tuition involving supervised practice.     

嵌入式32位RISC CPU兼容性设计概述

对于很多IC设计者而言,兼容型嵌入式微处理器的设计一直以来都是一个很令人感兴趣的话题,因为可以从设计过程中学到很多宝贵的经验。兼容性设计主要有硬件兼容和软件兼容两个方面。硬件兼容包括指令集、体系架构、总线接口等。软件兼容是指使用原厂开发工具可以通过JTAG或是串口实现软件的在线调试。     

基于SimpleScalar的动态分支预测器研究

分支预测精度是影响当代处理器性能的重要指标,在近十年内一直是学术界和工业界的研究热点。为给不同应用场合的处理器动态分支预测器设计提供性能参考,针对处理器架构设计中应用广泛的几种动态分支预测器,使用SPEC CPU2000在SimpleScalar模拟器中进行仿真及测试分析。测试结果以预测精度和指令/时钟周期作为指标,并结合硬件开销,分析了不同种类分支预测器的适用对象和场合。     

A research agenda for computing developments associated with innovation pipelines

Over the past few decades, our industrial age has entered into an important phase in its evolution: innovation. While innovation could proclaim underlying political and strategic intentions when it was still in the early stages, it must now assert itself in the form of tangible and measurable methodological approaches backed by tools that are designed to provide stakeholders with services at every phase of the innovation process. The world of standardization has already perceived the need to standardize and measure innovation. However, it has perhaps not yet anticipated that any form of measurement is only meaningful if our computing tools have been sufficiently developed to cope with this evolution. Indeed, while the age of quality saw the emergence and firm anchoring of several tools in our industrial practice, the age of innovation is still focused on research in the fields of marketing and management, and any initiatives that dare attempt to structure its deployment via radical changes in what is currently known, practised and acknowledged in the business environment today, are thin on the ground. This article traces the historical facts that legitimize the emergence of a new age for tools allowing computer-aided artefact creation and proposes a research agenda for the scientific communities involved.     

网上计算机系统虚拟实验室的研究

该文论述了网上计算机系统虚拟实验室的实现研究，介绍计算机组成及整机系统设计虚拟实验以及虚拟实验室网络化的实现方法。     

一种基于Web的集成编辑系统设计及实现

该文介绍了一种基于Web的多媒体计算机辅助教学集成制作系统,详细讨论了该系统设计与实现的方法,并且在应用中显示了它的有效性和实用性。