Solid Edge于减速器参数化建模的应用

程序参数化方法是随着CAD技术不断发展的设计方法,有的是以AutoCAD为平台,有的是利用Pro/Toolkit的不同开发方法,但诸多的参数化设计方法,它们有的功能不够完善,有的操作复杂,交互性不强;基于这种状况,本文以VB为开发工具,采用变量表技术与VB直接调用SolidEdge技术相结合。利用该参数化技术,可以很方便地完成对图形的修改,避免繁琐的设计计算、绘图工作,从而提高设计精度和效率。     

位置计算法再研究

本文在进一步研究快速排序法和位置计算法的基础上 ,对位置计算法进行了改进 ,使程序得到了优化 ,从而提高了运行效率。通过上机实验 ,获得满意的效果     

基于多域和层次结构的网格数字图书馆

数字图书馆的超大容量数据决定了现有的数字图书馆一定要采用分布式技术，资源的多样化特性决定了数字图书馆需要采用统一的平台来屏蔽资源的异构性。网格技术在以上两个方面都能满足数字图书馆的需求。网格技术与数字图书馆的结合是数字图书馆的发展趋势。本文在将数字图书馆和网格结合的基础上提出了基于多域和层次结构的网格图书馆。     

高性能计算机及其相关技术研究

简述了高性能计算机的发展及其所需的相关技术，对高性能计算机的发展趋势进行了预测。     

Workstation-assisted education at MIT

MIT launched a major new initiative called Project Athena in 1983 to improve the quality of education through the introduction of a high-quality computing infrastructure throughout the campus. Implementation of the Project Athena computing environment required eight years, cost about $100 million, and was sponsored by Digital Equipment and IBM in addition to MIT. The Athena computing environment is based almost entirely on workstations from these two vendors using the Unix operating system. Project Athena is now complete. The resulting computer system has been turned over to the campus computing organization for ongoing operation and maintenance. The computing environment available at MIT for education has been significantly improved. Students are graduating today that have never known life at MIT without the ubiquitous availability of high-quality computing. This article provides an overview of the initial objectives and strategies of Project Athena at MIT relative to its educational use. The specific strategies that MIT employed in the use of work-stations in educational are then described. These strategies are contrasted with other available strategies. Specific examples of the use of workstations are presented. An important element in current and future education delivery is multimedia. Athena in conjunction with the MIT Media Lab has one of the largest efforts in multimedia development of any of the universities, and MIT is using multimedia in education on a daily basis. A new laboratory, the Center for Educational Computing Initiatives, has been established with a major focus on multimedia. Finally the lessons learned from Athena relative to its primary objective — that of improving education — are reviewed.     

NOAA Environmental Data Management

The United States’ National Oceanic and Atmospheric Administration (NOAA) operates over one hundred observing systems and numerical models providing information and forecasts about the planetary environment from the bottom of the ocean to the surface of the Sun. Collected NOAA data constitute an irreplaceable resource that must be well-documented, discoverable, accessible, and preserved for future use. Good data management should therefore be part of NOAA's core business practices, and employees and leadership should be aware of their roles and responsibilities in this arena. NOAA has developed an Environmental Data Management (EDM) Framework document that discusses Principles, Governance, Resources, Standards, Architecture, Assessment, and the Data Lifecycle, and which also enumerates specific recommendations. The NOAA EDM Committee has issued Directives pertaining to data management planning, archiving, data access, metadata, and other topics. A Data Catalog has been established, and a project to assign persistent, citable identifiers to archival data is well underway. Numerous groups at NOAA are performing technical work related to data access, usability, and preservation.

The purpose of this article is to describe these documents and activities in order to share our experiences and to provide guidance and encouragement for improved data management practices and processes at other organizations.     

《高级计算机体系结构》课程改革探讨

随着高性能计算机体系结构的快速发展,出现了与此相关的大量新概念与新技术。因此,在高校硕士研究生教学中需要对《高级计算机体系结构》进行相应改革。文章探讨了新形势下面向计算机专业硕士生的《高级计算机体系结构》课程的教学内容、教学方法与考评模式的改革,以激发学生的学习和研究热情,提高教学效果和教学质量。     

CILT2000: Ubiquitous Computing—Spanning the Digital Divide

This paper discusses the role of ubiquitous and handheld computers in education. CILT contributions in this area are summarized, the Ubiquitous Computing sessions at the CILT2000 Conference are described, and future directions are highlighted. It is posited that handheld computers have the potential to reduce the digital divide, while also providing for a wide array of learning activities that can benefit all students.     

Teachers' computer anxiety: implications for professional development

Changes in society's expectations mean that school teachers need to be able to use computers in education with minimal anxiety. Some 350 primary and secondary school teachers completed a questionnaire that identified sources of computer anxiety and provided teachers with the opportunity to suggest solutions. The teachers were very supportive of the use of computers in education, but reported moderately low levels of computer competence. A number of suggestions for the reduction of computer anxiety are made, based on teachers' first-hand accounts, and an analysis of trends in the quantitative data. The implications of these suggestions for teachers' professional development are explored     

Employing subgoals in computer programming education

The rapid integration of technology into our professional and personal lives has left many education systems ill-equipped to deal with the influx of people seeking computing education. To improve computing education, we are applying techniques that have been developed for other procedural fields. The present study applied such a technique, subgoal labeled worked examples, to explore whether it would improve programming instruction. The first two experiments, conducted in a laboratory, suggest that the intervention improves undergraduate learners’ problem-solving performance and affects how learners approach problem-solving. The third experiment demonstrates that the intervention has similar, and perhaps stronger, effects in an online learning environment with in-service K-12 teachers who want to become qualified to teach computing courses. By implementing this subgoal intervention as a tool for educators to teach themselves and their students, education systems could improve computing education and better prepare learners for an increasingly technical world.