论文部分内容阅读
为根据已有的经验提炼出对系统可靠性评判的决策准则,基于汪培庄的因素空间理论与笔者提出的空间事故树理论思想,构造了一套从决策经验中提取决策准则的方法.该方法适用于条件属性为域值的多因素影响系统.首先数据归一化构建基础信息决策表Ψ(T).计算x_i与x_j关于属性a_q的相似度S(x_i,x_j,a_q),形成相似性表Θ(U,C,S).根据相似性阈值f将Θ(U,C,S)化简得Θ′(U,C′,S).根据模糊度θ,将Θ′(U,C′,S)改造为模糊二项相似表Ω(Θ′,θ),从而构建区分矩阵Γ(Ω).对U进行决策组划分,形成决策项,组成决策归纳表L(T).利用L(T)和Ψ(T)得到了切合实际使用的决策语义表L(T).从方法处理实际问题的结果看,在只利用条件属性集合与对象集合的条件下,即可判断经验决策的合理性.经过一系列的数据处理最终得到的决策语义表L(T),它可以判断系统工作状态属于哪种系统可靠性的决策,并确定了这种决策的置信度.
In order to extract the decision criterion of system reliability evaluation based on the existing experience and based on Wang Peizhuang’s factor space theory and the author’s theory of spatial accident tree theory, a set of decision-making criteria extraction method from decision-making experience is constructed. First, the data is normalized to construct the basic information decision table Ψ (T) .The similarity S (x_i, x_j, a_q) between x_i and x_j about attribute a_q is calculated to form the similarity table Θ (U, C, S) is reduced from Θ (U, C, S) according to the similarity threshold f According to the degree of ambiguity θ, Θ ’(U, C’ (Θ ’, θ) to construct the discriminant matrix Γ (Ω). The decision-making group is divided into U to form the decision-making items, which form the decision generalization table L (T) T (t) and Ψ (T), we get the L (T) decision-making semantic table L (T) .Through the results of the method to solve practical problems, we can judge the reasonableness of empirical decision under the condition of using only the set of condition attributes and the set of objects After a series of data processing the final decision-making semantic table L (T), it can determine which system reliability the system working state belongs to, and indeed Set the confidence of this decision.