Performing armchair roundoff analyses of statistical algorithms

Numerical stability is but one of many desirable properties which should be considered when designing statistical software. However, rigorous roundoff analysis is rarely done because it seems not worth the price; the influence of rounding error is usually of secondary importance, and the analysis is thought to be beyond the reach of all but a few specialists. This note discusses the role of roundoff analysis in the design of a statistical program and shows that new techniques sometimes make assessment of the effect of rounding errors no more difficult than the verification of other program properties.     

《金属工艺学》助教型多媒体课件的设计制作

《金属工艺学》是机械类及近机械类重要的技术基础课。根据这门课的内容及特点研制开发了助教型多媒体教学软件 ,制成光盘 1 8片 ,其中包括材料基础知识及铸锻焊的有关内容。该教学光盘存有丰富的教学素材 (如动画和视频影像 )。为配合该光盘开发了参数播放软件 ,可以在计算机上实现对视频及音频文件的随意播放、在线点播 ,有利于实现多媒体辅助教学     

ISPLSI器件及应用

在系统可编程大规模集成逻辑器件ISPLSI编程时可不用编程器，用户可直接对目标反复编程。本文介绍了Lattice公司的ISPLSI器件1016，讨论了用ISPLSI器件设计逻辑电路的方法。并给出了一个应用实例，最后还阐述了ISPLSI器件的开发前景。     

软件无线电中正交数字变频的DSP实现

介绍了软件无线电的概念及DSP基本原理,利用DSP实现软件无线电中的正交数字变频技术,给出了中频下变频的数字化实现的主程序.     

大连软件服务外包产业发展的现状、优势与建议

针对大连逐渐成为承接国际服务外包产业转移的重要基地的现状,指出大连具有发展软件外包的区位优势、人才优势、产业优势及政策优势,探讨大连目前发展软件外包产业存在的问题,提出提高大连本土企业竞争力、加强人才培养、改善投资软环境和提供政策支持等进一步发展大连软件外包的建议.     

创业能力情景模拟训练测评方法及系统研究

随着创业能力学习论逐渐被大家接受,创业者的创业能力如何训练提高和评价成为人们关注的焦点.通过资料综述确定成功创业者拥有的创业能力特征因子,即动机、品质、自我认知、价值观和深层次创业知识经验与技能,根据5种因子特征,在E-prime测评软件平台上分别采用内隐联想测试（IAT）、镶嵌图形测试和斯特鲁普效应测试（Stroop）,可以建立一种创业能力情景模拟综合测评方法,设计其测评系统程序.两组被试测评结果相关分析表明：创业动机不同的两组被试IAT测评分在置信度95％区间存在显著差异;创业能力不同的两组被试总测评分也存在显著差异.     

在高校物理实验中引入计算机辅助

论述了在物理实验中引入计算机辅助的构思和必要性，列举了计算机在辅助教学（CAI）、模拟实验等方面的应用。     

Statistical Microcomputing—Like it is

A statistical software package is a collaborative effort between a program's authors and users. When statistical analysis took place exclusively on mainframe computers, the entire statistical community was served by some three to six major packages, which helped to ensure that program errors would be quickly uncovered and corrected. The current trend toward performing statistical analysis on microcomputers has resulted in an explosion of software of varying quality, with more than 200 packages for the IBM PC alone. Since all of these programs are competing for the same base of knowledgeable users, the number of sophisticated users per package is dramatically less than for mainframe packages; the net result is that problems in any particular package are more likely to go unnoticed and uncorrected. For example, the most widely used shareware package contains major errors that should cause it to be rejected out of hand, and three best-selling packages analyze unbalanced two-factor experiments using an approximate technique originally developed for hand calculation. Several strategies are offered to help author and user reveal any problems that might be present in their software.     

基于分布式结构的铁路工程建设信息管理系统

为适应铁路工程建设中信息管理的要求 ,在现代铁路建设中引入BPR、MRP等先进管理思想 ,以WindowsDNA技术设计开发出一种基于网络的信息管理系统 ,系统采用了全局数据库管理系统结构 ,降低了系统的构建及维护成本。最后 ,给出了系统的物料管理子系统的逻辑结构示意图 ,并列出构建该系统的主要程序段。