具有椭球形势能的非晶态模型

利用计算机建造了一个二维硬椭球无规密堆模型.其双体相关函数显示出非晶态模型的特点,与二维硬球无规密堆模型不同.     

计算机辅助正交试验设计

因素(析因)试验是一种常见的试验。当部分因素间交互作用可以忽略时,正交试验设计是一种快速、有效的方法。本文分析了L_tu(t~q)型正交表的特性,探索应用计算机编制正交表及其交互作用列表的方法,并在此基础上,设计了功能齐全的通用软件。计算机辅助试验将帮助那些不熟悉试验设计理论的工程技术人员合理地安排试验。     

回转体机械零件尺寸标注智能化的研究

本文应用人工智能技术对回转体机械零件的尺寸标注进行了研究。设计者在专家系统的指导下,可得出尺寸标注的最佳方案。文中结合这个问题的研究,对机械设计专家系统的一些关键技术进行了讨论。     

函数曲线的双圆弧拟合

本文介绍在计算机绘图系统中,对一般非圆函数曲线的双圆弧拟合的算法和原理。并提供程序框图以供参考。     

基于WinCC和S7-200 PLC的转轮除湿多点温湿度监测系统

针对目前转轮除湿研究中,温湿度测量以干球温度、湿球温度测量为主,存在测量过程复杂,误差大等缺点,提出了基于WinCC和S7 -200PLC的转轮除湿多点温湿度监测系统。以转轮除湿机中处理风和再生风进出口及环境的温湿度作为研究对象,研华工控机IPC-610H作为上位机,西门子S7 -200作为下位机并作为控制器控制执行机构进行数据采集。通过EM231扩展模块进行数据交换,以SIMATIC WinCC组态软件做上位机监控画面,实现对转轮除湿机多个位置的温湿度监测。现场应用结果表明该系统便于管理,控制灵活,稳定性强。系统能简化测量过程,提高测量精度。     

A sequential split-and-conquer approach for the analysis of big dependent data in computer experiments

Massive correlated data with many inputs are often generated from computer experiments to study complex systems. The Gaussian process (GP) model is a widely used tool for the analysis of computer experiments. Although GPs provide a simple and effective approximation to computer experiments, two critical issues remain unresolved. One is the computational issue in GP estimation and prediction where intensive manipulations of a large correlation matrix are required. For a large sample size and with a large number of variables, this task is often unstable or infeasible. The other issue is how to improve the naive plug-in predictive distribution which is known to underestimate the uncertainty. In this article, we introduce a unified framework that can tackle both issues simultaneously. It consists of a sequential split-and-conquer procedure, an information combining technique using confidence distributions (CD), and a frequentist predictive distribution based on the combined CD. It is shown that the proposed method maintains the same asymptotic efficiency as the conventional likelihood inference under mild conditions, but dramatically reduces the computation in both estimation and prediction. The predictive distribution contains comprehensive information for inference and provides a better quantification of predictive uncertainty as compared with the plug-in approach. Simulations are conducted to compare the estimation and prediction accuracy with some existing methods, and the computational advantage of the proposed method is also illustrated. The proposed method is demonstrated by a real data example based on tens of thousands of computer experiments generated from a computational fluid dynamic simulator.     

Screening Adolescents for Health Risks Using Interactive Voice Response Technology

ABSTRACT

This report presents an evaluation of an interactive voice response telecommunications system developed for adolescent health risk screening. The technology provides a means to screen adolescents for general health risks and to score self-reported risk immediately. Adolescents listen to a series of prerecorded risk questions on standard touch-tone telephones and respond by pressing the appropriate keys on the keyboard. Health care workers are provided immediate feedback in the form of a summary fax report. The fax report indicates the adolescent's risk level and suggested interventions. This paper reports on an evaluation of this technology to collect self-reported risk data for 116 adolescents seen in an urban family practice center in Cleveland, Ohio. Clinical impressions of the new technology are reported for a pilot cohort of 22 physicians. The authors examine the process of using this technology to implement screening guidelines in various settings.     

大学生计算机焦虑形成的原因与应对策略

计算机网络给当代大学生带来了各种各样的便利的同时,也给大学生带来了新的忧虑———计算机焦虑。计算机焦虑是用户在使用计算机过程中厌恶或害怕计算机,或忧虑未来计算机使用而引起的情绪反应。大学生计算机焦虑的形成与大学生使用计算机的能力和经验、个人认知、自我计算机效能感等因素有关,提高大学生计算机使用技能、帮助他们获取成功经验和恰当运用心理治疗等方法有助于降低或消除计算机焦虑。     

多媒体CAI软件开发的关键技术

结合多媒体“数据结构”辅助教学系统的研制开发经验 ,全面阐述了多媒体 CAI软件研制开发的素材制作、人机交互界面设计、多媒体数据访问、媒体同步回放、面向对象超文本信息组织等一系列关键技术 ,并给出了具体实施办法 .     

试论学报编辑工作现代化

学报编辑工作的现代化进程大致可分成两个阶段.第一个阶段是利用计算机排版系统取代传统的铅字排版,实现排版计算机化;第二个阶段是利用先进的互联网技术,实现编辑工作网络化.