基于UML的信息系统建模

介绍了使用UML建立信息系统模型的RUP方法，并分析了UML建模中涉及的Use Case的识别、类的抽取、职责分配、持久化存储等问题，然后探讨了UML建模过程中几个相关问题的解决方案，最后指出了使用UML建立信息系统模型时的不确定性。     

Statistical Power of the Multiple Domain Latent Growth Model for Detecting Group Differences

The latent growth model (LGM) in structural equation modeling (SEM) may be extended to allow for the modeling of associations among multiple latent growth trajectories, resulting in a multiple domain latent growth model (MDLGM). While the MDLGM is conceived as a more powerful multivariate analysis technique, the examination of its methodological performance is very limited. Hence, the present study compared the power of the MDLGM with that of a set of univariate LGMs for detecting group differences in growth rates over time using a Monte Carlo study with a two-group and two-domain design. The results indicated that there were different scenarios where the power rates for the MDLGM were greater than that of the set of LGMs (and vice versa) due to a joint function of the two domains’ intercorrelation size and the group difference effect size.     

基于本体的信息检索系统的应用研究

首先分析了传统信息检索技术存在的语义匮乏的缺点,然后对语义检索的基本原理、本体知识、语义信息系统四个关键模块进行了说明,给出一种新的本体构建方法,在此基础之上提出了基于本体信息检索系统的体系框架,并且描述了系统原型的设计思想和检索流程,最后通过一个试验系统平台对系统模型进行验证。实验结果表明,在和传统检索系统的对比中,本系统具有扩充检索词的内涵和外延的强大功能,极大提高了检索的查全率和查准率等性能和优越性。     

基于I-DEAS的渐开线齿轮精确建模研究

对I-DEAS中生成精确渐开线的方法进行了研究,渐开线的生成有两种方法:一种是编程自动生成,一种是利用Function Spline手动生成。接着介绍了渐开线斜齿轮、圆锥齿轮的精确建模,为CAE/CAM提供了精确的三维模型。     

Examining Intermediate Omitted Levels in Hierarchical Designs via Latent Variable Modeling

This article outlines an interval estimation procedure that can be used in a 3-level setting to evaluate the proportion of outcome variance attributable to the second level of clustering. The method is useful for examining the necessity of including a possibly omitted intermediate level of nesting in analyses of data from a multilevel study, and represents an informative addendum to current statistical tests of second-level variance. The approach is developed within the framework of latent variable modeling and can be used as an aid in the process of choosing between 2-level and 3-level models in a hierarchical design. The discussed procedure is illustrated with an empirical example.     

基于ASP.NET技术的网上选排课系统的研究与开发

基于ASP.NET技术的网上选排课系统是现代高校综合教务管理系统的重要组成部分.本文对基于ASP的网上选课系统开发的基本原理和系统结构作了阐述,讨论了如何利用ASP实现对数据库的动态操作,并介绍该在线选排课系统的主要功能模块.     

球头铣刀铣削过程的物理建模与仿真

给出了球头铣刀刃线几何模型,采用理论切削力分析与实验-系数识别相结合的方法,建立了新的螺旋刃球头铣刀的铣削力模型;建立了考虑刀杆柔性的球头铣刀铣削振动模型;考虑刀具动态变形和工件表面波纹对切削厚度的再生反馈,建立了球头刀铣削动力学模型,对动态铣削过程进行了仿真,证明离线仿真可以对铣削过程动特性做出准确的预测.     

A prototype of workflow management system for construction design projects

1 Introduction 1 In recent years there is a growing understanding of the importance of effective design management to facilitate a coordinated building design within budget, and to ensure the smooth operation of a project [1]. Therefore, it becomes a certain tendency that management of construction design project should combine with information technology (IT) to approach information share and process integration. Since the application of computer-aided design technology (CAD) in China at la…     

传统几何造型艺术在现代服装设计中的立体表现

近年来,富有形式美感的几何造型服装在时装舞台上越加醒目,越来越多的设计师开始关注传统几何造型艺术在服装设计中的应用价值。如何将传统的造型艺术与现代时尚设计相结合,并创造出新的表现方式,成为研究的关键。在对几何造型的历史渊源及其相关的形式特点进行分析的基础上,对服装廓形、肌理图案、面料中的几何元素在现代服装设计中的立体表现进行分析研究,有利于探索其完美结合后的艺术和商业价值。