共查询到20条相似文献,搜索用时 93 毫秒
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《数学的实践与认识》2015,(21)
利用广义优势关系,可完成不完备直觉模糊信息系统属性约简工作.若不完备直觉模糊信息系统属性约简不一致时,则可进一步利用广义优势关系定义此类信息系统的分布函数和最大分布函数,然后介绍分布约简和最大分布约简的概念,最后给出求分布约简和最大分布约简的有效方法.由此可成功解决不一致不完备直觉模糊信息系统属性约简问题. 相似文献
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本文首先定义了不完备模糊目标信息系统及其非对称相似关系,然后借鉴经典的可辨识矩阵精度约简算法,提出一种新的基于非对称相似关系的可辨识矩阵(α,β)精度约简算法,对不完备模糊目标信息系统进行属性约简.最后给出一个实例,检验算法的可行性. 相似文献
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软集合理论是处理不确定问题的一种新兴数学理论.作为软集合重要的应用领域之一,软集合的参数约减的研究大都基于完备信息系统.介绍了异或软集合的改进运算以及异或软集合决策系统,提出了一种基于异或软集合的不完备信息系统约减方法,同时与拓扑方法相比较.结果表明,算法得出的约减软集合是拓扑法求出的约减软集合的一个子集,即该算法在对数据刻画方面较为细致和全面. 相似文献
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不完备信息系统中目前有多种扩充,如基于容差关系的扩充、基于相似关系的扩充等等,但是这些扩充都各自存在局限性。针对这些局限性,引入相对分类错误率的概念,提出了一种基于限制容差关系下的集对变精度粗糙集模型。这就将经典的粗糙集模型和限制容差关系下的集对粗糙集模型进行了推广。然后,讨论了该模型上、下近似算子的一些性质。最后,通过一个具体例子,说明了该模型在不完备信息系统中处理模糊和不确定性知识是可行、有效的。 相似文献
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IMTL代数是一类重要的非经典逻辑代数,基于IMTL代数的L模糊粗糙集可以刻画信息系统中具有不完备性、模糊性与不可比较性的信息.本文讨论了基于完备IMTL代数的L模糊粗糙集的表示定理,还讨论了此种L模糊粗糙集的上下近似算子的性质以及近似算子的公理化定义方法. 相似文献
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A. Souquière 《International Journal of Game Theory》2010,39(4):699-722
We consider differential games with incomplete information. For special games with dynamics independent of the state of the
system and linear payoffs, we give a representation formula for the value similar to the value of repeated games with lack
of information on both sides. For general games, this representation formula does not hold and we introduce an approximation
of the value: we build a sequence of functions converging to the value function. 相似文献
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《International Journal of Approximate Reasoning》2014,55(8):1764-1786
With the rapid growth of data sets nowadays, the object sets in an information system may evolve in time when new information arrives. In order to deal with the missing data and incomplete information in real decision problems, this paper presents a matrix based incremental approach in dynamic incomplete information systems. Three matrices (support matrix, accuracy matrix and coverage matrix) under four different extended relations (tolerance relation, similarity relation, limited tolerance relation and characteristic relation), are introduced to incomplete information systems for inducing knowledge dynamically. An illustration shows the procedure of the proposed method for knowledge updating. Extensive experimental evaluations on nine UCI datasets and a big dataset with millions of records validate the feasibility of our proposed approach. 相似文献
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以不完备序区间值决策系统为研究对象,其中不仅包含遗漏型未知区间值,而且属性值域为全序集.给出了未知区间值的三种形式及其填充式区间值的定义,引入灰的白化方法用以构建一个新的填充式不完备序白化值决策系统,并讨论其在优势和弱势关系下的可信规则获取.进一步研究了优势和弱势对象的约简以及其决策类的相对约简问题,给出了相应的判定定理与区分函数,为最终从不完备序区间值决策系统中获取最优可信决策规则提供了新的理论基础与操作手段.、 相似文献
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In this paper, we investigate the decision making problem based on fuzzy preference relation with incomplete information. We first introduce incomplete fuzzy preference relation and present some of its desirable properties. We then develop a system of equations. Based on this system of equations, we propose a procedure for decision making based on incomplete fuzzy preference relation, and finally, a numerical example is presented to illustrate the proposed procedure. 相似文献
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解决了不完全偏好信息下含有模糊决策元素的房地产投资方案的优选问题.分析形成了房地产投资方案的评价指标体系,并在Hamming距离与Euclidean距离测度的基础上,建立了不完全偏好信息下的模糊多属性决策模型,能处理决策元素为一般模糊数的决策问题,同时提供了所建非线性规划模型的交叉迭代解法.实际算例的比较结果表明,本文提出的决策模型及算法优于文献中关于偏好信息完全确知的经典模型与算法. 相似文献
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《Journal of Applied Mathematics and Mechanics》1998,62(4):529-536
The inverse dynamical problem of the restoration of the controls or parameters of a dynamical system which are unknown in advance is considered, using results from the observation of the motion of the system under conditions when there is incomplete information on the phase states of the system. It is assumed that, at appropriate actual instants of time, the observer only obtains certain information sets containing the actual phase states of the system. It is well known that this problem is ill posed. Constructive dynamic regularizing algorithms for solving the problem are constructed which posses the property of physical feasibility and are capable of working under real-time conditions while processing incoming information during the motion of the system and producing a result in dynamics as the motion develops. 相似文献
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利用优势关系,可对完备直觉模糊信息系统与决策信息表进行属性约简.将优势关系改进为广义优势关系,在此基础上构建了不完备直觉模糊信息系统与决策信息表的辨识矩阵,得到了求解属性约简与相对约简的具体方法. 相似文献
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The aim of this paper is to present a logarithmic least squares method (LLSM) to priority for group decision making with incomplete fuzzy preference relations. We give a reasonable definition of multiplicative consistent for incomplete fuzzy preference relation. We develop the acceptable fuzzy consistency ratio (FCR for short), which is simple and similar to Saaty’s consistency ratio CR for multiplicative fuzzy preference relations. We also extend the LLSM method to the case of individual preference relation with complete information. Finally, some examples are illustrated to show that our method is simple, efficient, and can be performed on computer easily. 相似文献