共查询到18条相似文献,搜索用时 109 毫秒
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针对大多数属性约简算法时间复杂度比较高的问题,利用粗糙集理论提出了一种新的解决办法,该方法基于相似矩阵概念,利用属性在相似矩阵中出现的频率给出了属性重要性的计算公式,以此作为启发式知识来约间决策表中的冗余属性,并将折半查询的思想运用到算法中以加快约简的速度。实验表明该算法是简单有效的. 相似文献
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针对信息表中相对核的计算采用分治策略提出了一个新的属性约简方法,将在计算整个全域上的属性约简问题转化为计算在相应划分的子区域上属性约简问题.将原有计算POS X0(y)的算法复杂度O(|A||U|^2),降为O(|A|(|Y1|^2 |Y2|^2 … |Yn|^2)),对于一般比较大的|U|说,效率提高非常明显,提高了属性约简的可计算性. 相似文献
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属性约简是粗糙集理论研究中的重要内容之一。本文主要研究集值信息系统的属性约简问题。在集值信息系统中基于拟序关系引入了信息量的概念,给出了属性特征的判定方法,以及信息量与属性约简之间的关系。根据信息量定义了属性重要性,研究了属性重要性与属性约简之间的关系。进而得到了基于信息量和属性重要性的属性约简算法,给出了该算法的时间复杂度。通过实例说明,该算法是有效的。 相似文献
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A Comparative Study of Using Grey Relational Analysis in Multiple Attribute Decision Making Problems 总被引:2,自引:0,他引:2
Hsin-Hung Wu 《Quality Engineering》2002,15(2):209-217
This paper uses grey relational analysis (GRA) method in multiple attribute decision making (MADM) problems. The advantages of using the GRA method include the followings: The results are based upon the original data, and the calculations are simple and easy to understand. It is one of the best methods to help management make decisions under business environment. Finally, an example is provided to show how this GRA method works in dealing with MADM problems. Moreover, the results from other methods are compared including the technique for order preference by similarity to ideal solution and operational competitiveness rating method. 相似文献
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The selection of an optimal material for an engineering design from among two or more alternative materials on the basis of two or more attributes is a multiple attribute decision making (MADM) problem. The selection decisions are complex, as material selection is more challenging today. There is a need for simple, systematic, and logical methods or mathematical tools to guide decision makers in considering a number of selection attributes and their interrelations and in making right decisions. This paper proposes a novel MADM method for material selection for a considered design problem. The method considers the objective weights of importance of the attributes as well as the subjective preferences of the decision maker to decide the integrated weights of importance of the attributes. Furthermore, the method uses fuzzy logic to convert the qualitative attributes into the quantitative attributes. Three examples are presented to illustrate the potential of the proposed method. 相似文献
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Material selection, one of the mostly encountered decision problems in material science literature, is still an onerous task for manufacturing organisations. Achieving accurate solution to this issue, the paper developed a model selection interface to enable analytical solutions to different problem concepts in material selection under multiple attribute decision-making (MADM) environments. Specifically, the generic framework of the fuzzy axiomatic design-model selection interface (FAD-MSI) is modified and successfully applied to the different material selection problem concepts. Consequently, the derived problem-model sets can be referred to accomplish further proposals on this era. 相似文献
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In the last decade, there has been growing interest in the assessment and selection of investments in advanced manufacturing technologies (AMTs). Several authors have pointed out the shortcomings of traditional financial techniques, proposing alternative approaches usually referred to as 'non-conventional' approaches. Among them, some authors have recently proposed fuzzy multi-attribute decision making (MADM) techniques, which seem to be particularly suitable for dealing with the intangible effects of AMTs. However, no attempt has so far been made to analyse and compare the various MADM techniques included in the fuzzy theory with respect to their applicability to the assessment and selection of AMTs. The objective of this article is to give a reference framework for the application of a MADM fuzzy approach to AMT selection. In particular, the paper describes three major categories of fuzzy MADM approach and compares their results using a case study. 相似文献
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Measurement of operational performance and decision making under multiple attributes are shown to be essentially the same process. A recent operational performance measurement (OPM) procedure called OCRA (operational competitiveness rating) and a multiple attribute decision making (MADM) method called TOPSIS (technique for order preference by similarity to ideal solution) are shown to produce ratings that are identical up to a linear transformation. Further investigations into OPM and MADM lead to their equivalence. The equivalence of the two methods can open up new research and application possibilities in both productivity analysis and MADM. Reviews of both the non-parametric approach that leads to the OC RA procedure and the TOPSIS method are provided, new perspectives on these methods are introduced and examples offered. 相似文献
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In real life, incomplete information, inaccurate data, and the preferences of decision-makers during qualitative judgment would impact the process of decision-making. As a technical instrument that can successfully handle uncertain information, Fermatean fuzzy sets have recently been used to solve the multi-attribute decision-making (MADM) problems. This paper proposes a Fermatean hesitant fuzzy information aggregation method to address the problem of fusion where the membership, non-membership, and priority are considered simultaneously. Combining the Fermatean hesitant fuzzy sets with Heronian Mean operators, this paper proposes the Fermatean hesitant fuzzy Heronian mean (FHFHM) operator and the Fermatean hesitant fuzzy weighted Heronian mean (FHFWHM) operator. Then, considering the priority relationship between attributes is often easier to obtain than the weight of attributes, this paper defines a new Fermatean hesitant fuzzy prioritized Heronian mean operator (FHFPHM), and discusses its elegant properties such as idempotency, boundedness and monotonicity in detail. Later, for problems with unknown weights and the Fermatean hesitant fuzzy information, a MADM approach based on prioritized attributes is proposed, which can effectively depict the correlation between attributes and avoid the influence of subjective factors on the results. Finally, a numerical example of multi-sensor electronic surveillance is applied to verify the feasibility and validity of the method proposed in this paper. 相似文献
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Takacs O. Varkonyi-Koczy A.R. 《IEEE transactions on instrumentation and measurement》2002,51(2):217-221
With the help of the singular value decomposition (SVD) based complexity reduction method, not only can the redundancy of fuzzy rule-bases be eliminated, but further reduction can also be made, considering the allowable error. Namely, in the case of higher allowable error, the result may be a less complex fuzzy inference system, with a smaller rule-base. This property of the SVD-based reduction method makes possible the usage of fuzzy systems, even in cases when the available time and resources are limited. The original SVD-based reduction method was proposed for rule-bases with linear antecedent fuzzy sets. This limitation remained valid in the later extensions, as well. The purpose of this paper is to give a formal mathematical proof for the original formulas with nonlinear antecedent fuzzy sets and thus to end this limitation 相似文献
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Recently, in situ Al–Mg2Si composites have been introduced as a new group of particulate metal matrix composites which contain hard particles of Mg2Si in Al-matrix. Unfortunately, coarsening of Mg2Si particles deteriorates the mechanical properties so that it is an important obstacle for the wide application of this type of composites. Our previous investigations depicted that the addition of Na and Mn as alloying elements and solution treatment in the different range of temperature can refine Al–Mg2Si composite structure and improve tensile properties. Selection of the optimal refinement condition to achieve maximum tensile properties of Al–15%Mg2Si composite is a multiple attribute decision making (MADM) problem where some criteria must be considered in decision making. In present research, technique for order preference by similarity to ideal solution (TOPSIS) and fuzzy TOPSIS methods were employed in solving the case study problem. Weights of each criterion were determined by using an analytic hierarchy process (AHP) method in both TOPSIS and fuzzy TOPSIS methods. The obtained results showed that the employed methods were suitable approaches in solving case study problem. Empirical findings in this study represented that TOPSIS and fuzzy TOPSIS methods might lead to the choice of refined Al–15%Mg2Si via solution treatment at 450 °C as the preferred alternative. 相似文献