基于CART算法的带钢抗拉强度影响因素研究

CART是数据挖掘的一种全新的优越的分类工具,是一种产生二叉决策树的技术。由CART模型构建的预测树在很多情况下比常用的统计方法构建的代数学预测准则更加准确,且数据越复杂、变量越多,算法的优越性就越显著。基于信息论的CART算法已在国际上被广泛的应用。阐述了CART(Classification and Regression Tree)算法的基本原理和主要特征,并介绍了连退的基本工艺流程和抗拉强度的概念。通过理论分析,选取了某钢厂连退机组生产过程中影响带钢抗拉强度的重要因素,视为模型的决策属性。根据CART算法,挖掘出三大影响抗拉强度的重要属性,建立了抗拉强度的评估规则。研究表明,CART算法有效的处理了因子之间的非线性关系,建立了可靠、有效的规则,为带钢生产提供了良好的决策依据。     

基于数据仓库的数据采掘技术应用

本文首先分析了基于数据仓库的数据采掘的主要方法,技术和应用,然后通过实例讨论了数据采掘在股票分析与决策系统中的应用。     

浅谈数据仓库技术

本文叙述了数据仓库（DW：Data Warehouse)的定义、基本特性与结构,以及数据仓库在决策系统（DSS:Decision Support System)中的应用,并展望了该技术的发展前景。     

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。     

基于数据挖掘技术的教学质量分析评价系统的实现

提出基于多维立方体的数据挖掘思想和方法以及一种定量分析和定性评价相结合的教学质量综合测评方法,并运用数据仓库和联机分析处理技术构建一种“平面”和“立体”相结合的教学质量综合测评体系,建立多维综合测评联机分析挖掘模型,实现在高校教学质量分析评价中的应用。     

基于数据仓库的个人理财系统

成为客户的顾问是个人理财系统的核心理念，在具体分析国内商业银行的现有信息系统后。本文提出了一个采用数据仓库技术实现个人理财的框架和一个具体可行的实施方案。     

装备技术保障数据仓库的建立

该文针对XX装备技术保障信息管理系统的开发,划分了系统的层次结构,提出了建立技术保障数据仓库的概念,并结合现有各个XX装备技术保障信息管理子系统模型,具体规划了面向决策分析的技术保障数据仓库的模型,研究了其实现方法。     

数据仓库技术在教育决策支持系统中的应用

介绍了数据仓库和联机分析处理,针对教育数据统计分析困难的现状提出了教育决策支持系统的一个解决方案。在对现有业务数据分析的基础上,给出了教育决策支持系统的总体框架,对数据仓库的逻辑设计、数据抽取与转换、OLAP分析以及OLAP前端展现方式进行了探讨,并实现了最终用户可以通过浏览器获取不同层次不同维度的数据以及以各种直观的图形方式展现数据。     

Determination of the effect of dairy powders on adherence of Streptococcus sobrinus and Streptococcus salivarius to hydroxylapatite and growth of these bacteria

Dental caries is a highly prevalent disease caused by colonisation of tooth surfaces by cariogenic bacteria, such as Streptococcus sobrinus and Streptococcus salivarius. Reducing initial adherence of such bacteria to teeth may delay onset of caries. Many foods, such as milk, can inhibit microbial adherence. In this investigation, the effect of untreated (UT) and enzyme-treated (ET) dairy powders on adherence of S. sobrinus and S. salivarius to hydroxylapatite (HA), an analogue of tooth enamel, was examined. Untreated (UT) acid whey protein concentrate (AWPC) 80 inhibited streptococcal adherence to phosphate-buffered saline-coated HA (PBS-HA) and saliva-coated HA (S-HA) by >80% at ?31.25 μg mL⁻¹. UT sweet WPC80, buttermilk powder and cream powder also significantly reduced adherence (P < 0.05). Enzyme-treatment of all dairy powders reduced their anti-adhesion activity. However, ET sweet WPC80 significantly inhibited growth of these streptococci (P < 0.05) at ?0.6 mg mL⁻¹. Therefore, dairy powders may reduce progression of dental caries by their anti-adhesion and/or antibacterial activity.     

Two types of a passive safety containment for a near future BWR with active and passive safety systems

The paper presents two types of a passive safety containment for a near future BWR. They are named Mark S and Mark X containment. One of their common merits is very low peak pressure at severe accidents without venting the containment atmosphere to the environment. The PCV pressure can be moderated within the design pressure. Another merit is the capability to submerge the PCV and the RPV above the core level. The third merit is robustness against external events such as a large commercial airplane crash. Both the containments have a passive cooling core catcher that has radial cooling channels. The Mark S containment is made of reinforced concrete and applicable to a large power BWR up to 1830 MWe. The Mark X containment has the steel secondary containment and can be cooled by natural circulation of outside air. It can accommodate a medium power BWR up to 1380 MWe. In both cases the plants have active and passive safety systems constituting in-depth hybrid safety (IDHS). The IDHS provides not only hardware diversity between active and passive safety systems but also more importantly diversity of the ultimate heat sinks between the atmosphere and the sea water. Although the plant concept discussed in the paper uses well-established technology, plant performance including economy is innovatively and evolutionally improved. Nothing is new in the hardware but everything is new in the performance.