浅谈物理模型在解题中的应用

本文通过几个实例说明了在具体问题中建立相应物理模型的方法以及物理模型在解题中应用的重要性。     

基于CGP模型的涌现研究

涌现是复杂性理论中的一个重要概念。在讨论涌现基本概念的基础上 ,介绍了一种用于研究复杂系统涌现行为的模型方法———CGP模型 ,给出了一个CGP模型的具体例子———采集机器人的仿真模型。通过对这个模型进行仿真实验 ,观察到机器人简单的状态转换函数和看似杂乱无章的行为产生了具有明显规律性的结果 ,对这种涌现现象的产生进行了分析 ,指出了它的现实意义。     

Research on Product Information Integrating and Sharing for Dynamic Colla boration

Dynamic Collaboration emerges as the new trend of n et working and collaborating work in manufacturing industry, in which product infor mation sharing among allied enterprises plays very important roles in collaborat ing product development. This thesis aims at studying the integrating, contr olling and sharing mode of product information among the heterogeneous and dispe rsed environments through Internet, and proposes the information integrating/sha ring architecture based on the Product Master Model (P...     

双金属氧化物和氧化物载体组分间的相互作用

讨论了一些过渡金属氧化物（NiO,CuO或MoO3)在经改性所得复合载体（TiO2-γ-Al2O3，MoO3-t-ZrO2或NiO-t-ZrO2)上的分散作用，这些三地体系中实验测定的氧化物分散容量与研究负载型二元氧化物体系所得嵌入模型的估算值基本相符；样品的表面组成、结构和性能与载体的表面结构、过渡金属氧化物的负载量和加料顺序以及焙烧温度密切相关。     

The Extraction Method of Cutting Engagement in Ball-end Milling Simulation

Ball-end mill is widely used in workpiece processi ng with free-form surfaces. Such models that can predict processing character istics precisely are very necessary to the aim of cost reducing, quality improvi ng and productivity progressing, the cutting force prediction is the most import ant among these models. To explore the physical essence of metal cutting, model researchers commonly simplify the geometric conditions in cutting process, and a ssume that the geometric parameters that are needed to s...     

Accurate forecasting of the undecided population in a public opinion poll

The problem of pollsters is addressed which is to forecast accurately the final answers of the undecided respondents to the primary question in a public opinion poll. The task is viewed as a pattern‐recognition problem of correlating the answers of the respondents to the peripheral questions in the survey with their primary answers. The underlying pattern is determined with a supervised artificial neural network that is trained using the peripheral answers of the decided respondents whose primary answers are also known. With peripheral answers as inputs, the trained network outputs the most probable primary response of an undecided respondent. For a poll conducted to determine the approval rating of the (former) Philippine president, J. E. Estrada in December 1999 and March 2000, the trained network predicted with a 95% success rate the direct responses of a test population that consists of 24.57% of the decided population who were excluded in the network training set. For the undecided population (22.67% of December respondents; 23.67% of March respondents), the network predicted a final response distribution that is consistent with the approval/disapproval ratio of the decided population. Copyright © 2002 John Wiley & Sons, Ltd.     

基于现场称重测试系统的设计与研究

依据系统结构原理，推导出数学模型，提出一种适于称重传感器测试系统的控制策略。根据该测试系统的特点，建立误差补偿模型，确定数据处理方法。 试验结果表明，整个测试系统简洁、高效、可靠；控制方案简单、易行，满足系统的性能要求；所采取的误差补偿办法切实可行， 经过处理的测试数据能够准确反映传感器测试系统的性能。     

基于代理的校园网计费管理系统

根据目前Cernet校园网典型结构,设计了一种适应性广、通用性强的校园网计费管理系统,探讨了使用代理服务器进行计费的主要功能和工作流程.     

A Dynamic Forecasting System with Applications in Production Logistics

Production logistics involve the co-ordination of ac tivities such as production and materials control (PMC), inventory management, p roduct life cycle management, etc. Those activities demand for an accurate forec asting model. However, the conventional methods of making sell and buy decision based on human forecast or conventional moving average and exponential smoothing methods is no longer be sufficient to meet the future need. Furthermore, the un derlying statistics of the market information change ...     

时间数据库（Tbase）的设计与实现

提出了在数据设计中时间数据库这一重要概念，应用这一概念，较好地实现了税收计划管理与分析系统。实践表明，设计方法是正确的。