决策树分类算法在个性化图书推荐中的应用

采用数据挖掘中的决策树方法,对图书馆的图书借阅数据进行研究和分析,提出了基于读者阅读兴趣的个性化图书推荐模型。实验表明,该模型能够为新老读者有针对性地推荐新书,较好地实现了图书馆的个性化的创新服务。     

基于关联规则挖掘的图像检索

针对图像检索中图像相似性判断所面临的"语义鸿沟"问题,本文提出了基于关联规则挖掘的图像检索。该方法利用数据挖掘技术,对图像纹理的各种低层可视化特征进行分析挖掘,获得一系列的图像低层特征值与高层概念之间的各种规则,将这些规则构成图像知识库,并与概念集合相对应。实验结果表明,采用关联规则挖掘能很好的提高图像检索的准确率。     

贵州息烽磷矿矿山接替方案的比较及实施效果

贵州息烽磷矿矿山接替方案有二：方案一为地下开采方案，该方案总投资1890万元，矿石直接生产成本38．51元／t；方案二为第二次露天延深开采方案，该方案总投资2370万元，矿石直接生产成本39.72元／t。通过分析比较，由于方案二回采率高，贫化率低，能开采山高品位原矿，对企业、国家及需矿厂家创造可观的经济效益。因此，选择了投资大，成本较高的方案二即第二次露天延深开采方案。经过对该方案两年的实施效果证明，该 技术上是可行的，经济上是合理的。     

XPG-800型悬挂式胶片冷却机的研制

介绍最新开发的XPG-800型悬挂式胶片冷却机的设计特点、工作原理、主要技术参数、结构特征，阐述了本机组主要技术改进。     

基于数据仓库的数据挖掘技术

首先介绍了数据仓库以及在此技术上产生的数据挖掘技术,其次阐述了实现数据挖掘应用的几种工具以及选用工具时应遵循的原则,最后说明了数据挖掘技术现存的问题及它现在重要的商业地位。     

Artificial Neural Network Model for Predicting Stable and Unstable Regions in Cu-Zn Alloys

Processing maps are developed using the Dynamic Materials Model (DMM) and instability criterion, which help in choosing optimum process parameters for hot-working of materials. Certain high-level expertise is required to interpret and extract the information on instability regimes to be avoided during processing. In recent years, Artificial Neural Network (ANN) models have been developed to predict flow stress by using the input vector; namely, temperature, strain rate and strain. In this study, using the available Cu-Zn alloy data, ANN model has been developed to classify the hot-working process parameters, such as temperature, strain rate and flow stress for instability regime, directly from the corrected flow stress data without applying the DMM. This model uses 10 compositions of Cu-Zn system, ranging from 3% Zn to 51% Zn. The developed ANN model has been able to learn the nonlinear classifier, which separates unstable region from the stable region in the Cu-Zn alloy system with zinc content less than 40%.     

Analysis of armature reaction and winding inductances of permanent magnet brushless DC motor with deep slot concentrated coils

Based on the configuration of deep slot concentrated coils, an analytical model is developed for predicting the armature reaction field produced by the 3-phase stator windings of permanent magnet brushless DC motors with concentrated coils by using the image method and the analytical functions of the armature reaction and winding inductances are proposed accounting for the influence of stator slotting. This approach is different from the method of equivalent distributed current sheet and more suitable for electric machines, which have concentrated coils and deeper slots. Under different control mode, the different analytical functions are presented. This will be helpful when further analyzing the performance of the motor. The results agree with the experiment very well. __________ Translated from Proceedings of the Chinese Society for Electrical Engineering, 2005, 25(12): 127–132 (in Chinese)     

机械优化设计的几种方法及评判指标

在机械优化设计的实践中,每一种优化方法都是针对某一种问题而产生的,都有各自的特点和各自的应用领域,不能绝对的用“好”或“不好”来评判.着重分析常用的机械优化设计方法,包括无约束优化设计方法、约束优化设计方法、基因遗传算法、模糊优化设计方法等并提出评判的主要性能指标.     

基于ARM的振动监测仪数采部分硬件设计

介绍了以32位ARM处理器为核心的振动监测仪器的数采部分硬件设计过程,通过使用高功能、低功耗的S3C44B0X与嵌入式实时操作系统μC/OS-Ⅱ,实现了旋转机械振动信号采集部分硬件设计及检测.     

机械零件三维建模与工程分析一体化设计方法

机械零件结构设计与工程分析一般不能在同一环境下进行,因而造成文件转换繁琐、设计效率低等问题.提出了在Solid Works环境下,解决这一问题的方法.按照零件三维建模,利用Solid Works的有限元分析功能对零件进行应力、应变、疲劳等分析,并动态、可视化地呈现出变形情况、各个节点的应力数值、安全系数等数字信息,并依此对零件进行结构修改,优化设计的思路,实现了机械零件结构设计与工程分析的一体化和数字化.