Simplified Markov Model for Reliability Analysis of Phased-Mission System Using States Merging Method

This paper presents a simplified Markov model to evaluate the reliability of phased-mission system (PMS). The time cost and storage requirement are very huge for traditional Markov model to analyze the PMS reliability as the number of components increases to a large scale. The states merging method proposed in this paper can account for the PMS with subsystems consisting of identical components, and similar PMSs are common in real-world systems. The simplified Markov model by states merging has smaller number of system states, compared with the traditional one. Furthermore, for the above subsystems, the size of our model increases only linearly as the number of components increases, while the size of the traditional model exponentially increases. Finally, the effectiveness and correctness of our approach are analyzed by comparing with the traditional Markov method.     

物流企业目标市场的选择

文中在定义物流有效市场和物流目标市场的基础上,对物流市场需求进行了分析,研究了物流市场的结构,并通过对案例的分析,对我国现代物流企业在进行目标市场定位时应考虑的问题进行了初步的探讨。     

一种基于知识的信息熵概念的粗糙集知识约简方法

文中提出了知识的信息熵的概念,通过知识的信息熵对属性的重要性进行了定义,提出了基于信息熵的租糙集知识约简方法,并通过实例进行了分析。分析结果表明文中提出的基于知识的信息熵概念的粗糙集知识约简方法是行之有效的。