Pro/E BMX的曲轴结构优化设计研究

在分析曲轴结构的基础上,对曲轴结构进行规格化处理,确定曲轴模型参数,并利用Pro/E行为建模技术,分析如何通过使用灵敏度分析、可行性研究和优化研究来寻找曲轴质量最小时,旋转轴与质心间的距离能否为零是否可行的设计目标。该方法为曲轴设计人员提供了一个简单、方便的建模方法和结构优化分析手段,有利于提高曲轴的设计质量和效率,缩短设计周期。     

项目教学法在Maya建模课程教学中的应用

在介绍项目教学法和Maya建模课程特点的基础上,阐述了项目教学法应用于该课程教学的思路和具体流程.按照该课程教学的目标和学生学习的基础来设定实用性项目;按照项目教学法流程来具体实施每个项目的教学过程.实施教学过程和考核方式的改革,突出学生学习的主体性、积极性.不仅培养学生的项目制作能力,还能培养学生的职业能力.     

Contributions of Learning Through Analogies to the Construction of Secondary Education Pupils’ Verbal Discourse about Chemical Change

This article analyzes the relationship between pupils’ level of understanding of the analogies proposed in class while working with a model of chemical change and their competence at constructing a coherent verbal discourse of that model in both its macroscopic and submicroscopic representations. The study participants were 35 pupils in their 3rd year of compulsory secondary education (14–15 years of age) who had been studying chemical change for several weeks in their subject of Physics and Chemistry. The results suggested that the pupils generally understood the proposed analogies quite well, and that a good proportion of them assimilated adequately the verbal discourse inherent in the proposed model of chemical change. There was also a statistically significant association between modeling and analogical thinking. In particular, the pupils with greater understanding of the analogies being considered were also those who tended to show a greater ability to verbalize the model of chemical change and reason with it when solving the tasks they had been set. These results concur with the literature by suggesting that a link exists between analogical thinking and modeling, and that learning with analogies has a positive influence on the construction of the chemical change model.     

Variations in observation frequency in a self-controlled learning environment do not modulate learning of a pirouette en dehors

ABSTRACT

Little is known about the optimal frequency to observe a skilled model, yet this is potentially an important learning variable, and thus was examined in the context of self-controlled learning conditions. Participants chose the schedule in which they interspersed both physical and observational trials of a dance skill. The participants’ choice, however, was governed by an imposed observation frequency (OF) of either 25%, 50%, or 75%. Participants were in one of these OF groups, in addition to another group in which no constraint was put on OF. This last group was predicted to choose an OF of 10%, however, it was determined that they chose a 50% schedule. Consequently, a 10% OF group was added to the experimental protocol. All participants completed a pre-test, followed by an acquisition phase, and then a 24-hr post-test. Physical performance (F(1, 55) = 143.77, p< .001) and cognitive representation (F(1, 55) = 77.68, p< .001) scores both revealed a significant main effect of Test; scores at post-test were higher than those at pre-test. Thus, learning was demonstrated for both measures. No main effect of Group emerged. Consequently, OF varying from 10% to 75%, under self-controlled conditions, were equally beneficial for learning the dance skill.     

基于PDA面向对象的餐饮管理信息系统建模研究

通过对现有点菜系统的对比分析,采用无线PDA＋无线接入点＋服务器的模式,将点菜功能集成到餐饮管理系统中,使整个餐饮系统具备了点菜、账单结算、预定管理及决策分析等功能,并对系统进行UML的静态用例建模和动态时序图建模,最后设计了系统硬件部署和功能结构组成。     

A UML profile for framework modeling

The current standard Unified Modeling Language(UML) could not model framework flexibility and extendibility adequately due to lack of appropriate constructs to distinguish framework hot-spots from kernel elements. A new UML profile that may customize UML for framework modeling was presented using the extension mechanisms of UML, providing a group of UML extensions to meet the needs of framework modeling. In this profile, the extended class diagrams and sequence diagrams were defined to straightforwardly identify the hot-spots and describe their instantiation restrictions. A transformation model based on design patterns was also put forward, such that the profile based framework design diagrams could be automatically mapped to the corresponding implementation diagrams. It was proved that the presented profile makes framework modeling more straightforwardly and therefore easier to understand and instantiate.     

An Adapted Structurational Framework for the Emergence of Communication Networks

Although structuration theory (ST) has endured a considerable influence in communication research across various domains, there remains a paucity of quantitative empirical research using ST as a viable framework. The purpose of this article is to develop an adapted structurational framework to explain the emergence of communication networks. The adapted framework distinguishes between relational states/events and internal/external structural rules. For analysis, we introduce multipanel relational event modeling, a technique using processual inference that can empirically demonstrate the recursive nature of system and structure. As an introductory example of both the framework and method, we examined communication, using cell-phone data, of students living in the same dormitory from September 2008 through February 2009. Our results demonstrated how different structures (i.e., perceived social relations and internal/external structural rules) are reproduced and transformed over time. Our research has implications for communication research dealing with recursivity, event-driven network analysis, the changing nature of the phone call, and the promise of computational communication science.     

计算机辅助美术教学浅议

在传统的CAI观点基础上 ,探讨计算机辅助美术教学的优势 ,拓展其方法和思路 ,具有一定启发性。     

产品装配设计系统中各功能子系统模块

计算机集成制造系统CIMS和并行工程CE技术的发展和应用,对装配设计提出了更高的要求。实现产品设计与产品装配规划信息集成是实现产品计算机辅助自动装配的重要基础。装配设计是一个重要而复杂的问题。本文在介绍课题研究的背景及意义的基础上,分析了装配系统包括的各大功能子系统结构模块。