共查询到20条相似文献,搜索用时 62 毫秒
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对属性权重信息完全未知且属性值为模糊数直觉模糊数的多属性决策问题进行了研究,定义了模糊数直觉模糊数的得分函数,进而提出了一种基于线性规划模型的模糊数直觉模糊多属性决策方法.最后通过实例对该决策途径的详细过程及有效性进行了说明. 相似文献
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研究了属性权重完全未知的区间直觉梯形模糊数的多属性决策问题,结合TOPSIS方法定义了相对贴近度及总贴近度公式.首先由区间直觉梯形模糊数的Hamming距离给出了每个方案的属性与正负理想解的距离,基于此,给出了相对贴近度矩阵,根据所有决策方案的综合贴近度最小化建立多目标规划模型,从而确定属性的权重值,然后根据区间直觉梯形模糊数的加权算数平均算子求出各决策方案的总贴近度,根据总贴近度的大小对方案进行排序;最后,通过实例分析说明该方法的可行性和有效性. 相似文献
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针对居民在购房决策过程中具有有限理性且相关决策属性权重信息未知的特点,本文提出一种新的基于前景理论的语言直觉模糊多属性群决策方法解决居民购房决策问题。首先,定义了语言直觉模糊距离并分析其相关性质。其次基于该距离,提出了一种主客观综合定权法来确定决策属性的权重。最后,引入决策者心理因素的前景理论,以平均方案作为参考点,利用各方案加权综合前景值得出备选方案的评价结果,据此对备选方案进行排序。本文将所提语言直觉模糊多属性群决策方法用于居民购房决策中,与已有决策方法的比较分析说明本文所提决策方法的有效性和优越性并为居民购房提供合理科学的参考决策。 相似文献
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《数学的实践与认识》2015,(10)
提出了一种基于距离测度的区间直觉梯形模糊多属性群决策方法.首先,基于个体决策矩阵与平均决策矩阵及极端决策矩阵之间的距离,获取专家的权重.然后,运用区间直觉梯形混合几何算子对个体决策矩阵和属性值进行集结,进而通过得分函数和精确度函数对方案进行排序.最后,通过应急方案选择的算例来说明该方法的可行性和有效性. 相似文献
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基于新精确函数的区间直觉模糊多属性决策方法 总被引:1,自引:0,他引:1
基于区间直觉模糊数隶属度和非隶属度构成的二维几何图形特征给出区间直觉模糊数精确函数的新定义,并将其作为区间直觉模糊数的排序指标,区间直觉模糊数的精确函数值越大,则区间直觉模糊数就越大,进而提出一种权重信息不完全确定的区间直觉模糊多属性决策方法.通过算例分析说明所提出排序指标的有效性和决策方法的可行性. 相似文献
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《模糊系统与数学》2016,(4)
以熵理论为基础,针对属性权重和时间权重完全未知的动态多属性区间直觉模糊决策问题,首先针对现有区间直觉模糊熵公理化定义的缺陷进行了分析,提出一种改进的区间直觉模糊熵的公理化定义,并据此构造了区间直觉模糊熵的一个新的计算公式;其次,利用改进的区间直觉模糊熵确定属性权重;再次,基于时间度体现对近期数据的重视程度的基础上,利用时间权向量的信息熵为优化目标来确定时间权重;然后,利用区间直觉模糊几何加权算子进行集结,并利用区间直觉模糊集的排序函数对决策方案进行排序和择优。最后,通过一个实例分析,表明本文提出的方法的可行性和有效性,为动态多属性区间直觉模糊决策问题提供了一种新的方法和思路。 相似文献
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Semigroup Forum - The variety generated by the Brandt semigroup $$B_2$$ can be defined within the variety generated by the semigroup $$A_2$$ by the single identity $$x^2y^2\approx y^2x^2$$ . Edmond... 相似文献
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Christian Borgs Jennifer Chayes Ayalvadi Ganesh Amin Saberi 《Random Structures and Algorithms》2010,37(2):204-222
We give a rigorous analysis of variations of the contact process on a finite graph in which the cure rate is allowed to vary from one vertex to the next, and even to depend on the current state of the system. In particular, we study the epidemic threshold in the models where the cure rate is proportional to the degree of the node or when it is proportional to the number of its infected neighbors. © 2010 Wiley Periodicals, Inc. Random Struct. Alg., 2010 相似文献
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This study explores how students learn to create, discuss, and reason with representations to solve problems. A summer school algebra class for seventh and eighth graders provided opportunities for students to create and use representations as problem-solving tools. This case study follows the learning trajectories of three boys. Two of the three boys had been low-achievers in their previous math classes, and one was a high achiever. Analysis of all three boys’ written work reveals how their representations became more sophisticated over time. Their small group interactions while problem-solving also show changes in how they communicated and reasoned with representations. For these boys, representation functioned as a learning practice. Through constructing and reasoning with representations, the boys were able to engage in generalizing and justifying claims, discuss quadratic growth, and collaborate and persist in problem-solving. Negotiating different student-constructed representations of a problem also gave them opportunities to act with agency, as they made choices and judgments about the validity of the different perspectives. These findings have implications for the importance of giving all students access to mathematics through representations, with representational thinking serving as a central disciplinary practice and as a learning practice that supports further mathematics learning. 相似文献
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Saralees Nadarajah 《Computational Statistics》2008,23(4):667-668
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刘彦佩 《中国科学A辑(英文版)》2001,44(8):1034-1041
This paper discusses the development of Boolean methods in some topics on graph embeddings which are related to VLSI. They
are mainly the general theory of graph embeddability, the orientabilities of a graph and the rectilinear layout of an electronic
circuit. 相似文献