ITS中基于模糊关系数据模型的知识表示及推理研究

使用模糊关系模型讨论建立学科知识库的方法,并用隶属度函数及模糊中心数等方法描述知识点属性,以知识点的模糊关系建立知识库,并且,就实现基于模糊关系数据模型推理过程,给出了两个关键性的算法。     

On a quasiorder on the class of monounary algebras

In the paper we introduce a relation on the class of monounary algebras by means of -homomorphisms. It is a quasiorder. We take a subclass of containing monounary algebras satisfying the property We characterize algebras in by the notions of a degree and properties of their -endomorphisms. We apply the results to finite monounary algebras. Supported by grant VEGA 1/0161/03     

Mineral admixtures in mortars: Effect of inert materials on short-term hydration

This work is the first part of an overall project the aim of which is the development of general mix design rules for concrete containing different kinds of mineral admixtures. The separation of the different physical effects responsible for the modification of cement hydration, when chemically inert quartz powders are used in mortars, is presented. The phenomenological approach, based on semi-adiabatic calorimetry, is only associated with first-order phenomena, and the study excludes the complex physicochemical details involved in the chemistry of cement. The results, obtained for a wide range of fineness (between 180 and 2000 m²/kg) and replacement rates (up to 75%), show that short-term degrees of hydration in mortars containing a chemically inert mineral admixture (quartz) are always higher than for a reference mortar. This study confirms that cement hydration is enhanced by inert mineral admixtures. The two main physical effects responsible for the modification of the hydration of cement are identified as the dilution effect and heterogeneous nucleation. The dilution effect of the cement is highlighted with a coarse mineral admixture. The heterogeneous nucleation effect, although it increases with fineness of mineral admixtures, presents an optimum depending on the replacement rate. In the following part of this work, these results will be used for the development of an empirical model allowing us to quantify both physical effects.     

科研团队中心理契约与创新行为的关系研究

近年来,心理契约的研究成为组织行为学研究的焦点,吸引了众多学者的理论探讨与实证研究。本文先对心理契约的概念、维度进行介绍,然后探讨科研团队中创新行为的影响因素,并阐述了科研团队中不同类型的心理契约对创新行为的影响作用。     

子网络的连接模式对关联网络可靠性影响研究

为了分析关联网络中子网络之间连接方式对网络可靠性的影响,根据不同子网络之间连接的度相关性,建立关联网络中子网络之间的连接模型,以节点之间非交叉路径的最大条数为可靠性测度,对由4个子网络组成的网络系统进行了分析。结果表明,当子网络之间的连接具有异配性时,网络具有较高的可靠性,但过大的异配性反而会降低网络的可靠性。     

基于测度贴近度的电子剪切散斑轮胎检测

本文把测度贴近度的概念引进到电子剪切散斑检测中,提出了一种基于测度贴近度的条纹形成算法。该算法大大地消除了条纹可见度对光照强度的依赖,提高了电子剪切散斑无损检测对工业环境的适应性,并且该算法可以在条纹产生的同时对其进行滤波,减轻了后续工作。本文从数学分析和实验两个角度证实了该算法的以上特点。     

贺力氏Multi-Lab Hvdris定氢系统使用探讨及影响因素

本文主要介绍贺力氏Multi-Lab Hvdris定氢系统使用探讨及影响因素。     

一种连续属性动态分类规则数据挖掘方法

连续属性的处理是当前分类规则中一个热点研究问题。以往的算法往往是建立在离散化过程的基础上进行的,然而,该类方法不但会破坏数据中信息的精度,同时也使得概念的转换十分困难。文章在分析了以往算法的基础上,提出了利用包含度和蕴含度的方法进行连续属性的分类规则学习,并对该种方法的属性约简问题进行了讨论。可以看出,通过该文的研究较好地解决了数据精度和动态概念挖掘的问题,利用包含度和蕴含度的方法是一个十分有价值的研究方向。     

面向对象数据模型在故障诊断专家系统中应用

近年来，专家系统在越来越多的领域中得到了广泛的应用。文中介绍一种基本关系数据库及采用面向对象思想表示和存储知识的故障诊断专家系统。该系统已应用于故障诊断中，并被证实具有方便、准确和可靠的特点。     

A Logical Design Method for Relational Databases Based on Generalization and Aggregation Semantics

In this paper,a series of esign methods for relational databases based on generalization and aggregation semantics is set up.The relationship between a class and its subclass s considered as a scheme constraint.The concept of inheritance dependencies,which describes the multiple inheritance among schemes, is presented in the paper.It is shown that the inference rules for inheritance dependencies are sound and complete.Furthermore,a series of results about the closure of inheritance dependencies and the minimal set of inheritance dependencies,which are analogues to functional dependencies,is obtained.In order to describe the aggregation semantices,the concept of aggregation dependencies is given.It is easy to implement these constraints under relational database management systems.