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1.
综合评价的多元分析方法   总被引:2,自引:0,他引:2  
本文运用多元统计分析方法,给出一种功能完整的定量分析的综合评价模型。即建立综合评价值的线性加权函数模型,及利用主因子方差贡献率给出指标权重计算法;根据综合评价值排序,及利用最优分割法划分级别;分析综合评价成因概念的因子分析方法.  相似文献   

2.
关于用主成分分析做综合评价的若干问题   总被引:54,自引:4,他引:50  
阎慈琳.关于用主成分分析做综合评价的若干问题.数理统计与管理,1998,17(2),22~25.探讨了特征向量的方向对用主成分分析做综合评价的影响,并提出改正意见  相似文献   

3.
基于区间估计的综合评判方法及其应用   总被引:1,自引:0,他引:1  
综合评判方法是系统评价中重要的数据处理方法.为了克服传统综合评判方法中的数据信息用"点"数值的不足,考虑整个评价过程中的数据信息用"区间数"表示的合理性,构建基于区间估计的综合评判方法.指标评价区间估计的集值统计处理,指标权重区间估计的区间判断矩阵处理,综合评判区间可能度分析.通过案例分析表明,综合评判方法具有较强的可行性和操作性,特别适用于综合评判中的数据信息不确定情形.  相似文献   

4.
无量纲化处理是开展综合评价的基础,目前线性无量纲化方法很少考虑群体评价的情况。本文针对常用的6种线性无量纲化方法直接应用到群体评价中不能保证各评价者评价信息横向大小顺序的问题,首先对问题进行界定,并对6种线性无量纲化方法进行了扩展;其次进一步分析了扩展后的线性无量纲化方法的性质,并针对群体评价问题引入“横向单调性”和“变量单一性”两个性质,为线性无量纲化方法的设计研究提供重要的参考;再次以无量纲化后的数据最大程度的保留原始信息为原则,针对不同的赋权方法,给出线性无量纲化方法选择的建议;最后,用一个算例检验了方法的有效性。  相似文献   

5.
基于主成分分析法的综合评价方法的改进   总被引:4,自引:0,他引:4  
针对用主成分分析法做综合评价存在的问题,提出了改进的方法即当第一主成分的综合评价值和熵值法得到的综合评价值具有一致性时,将两种评价结果进行集成综合评价,若两种评价结果不具有一致性时则采用主成分聚类法进行综合评价.  相似文献   

6.
企业竞争力综合评价物元模型与可拓评价方法   总被引:15,自引:0,他引:15  
本用可拓学的思想方法建立了企业竞争力综合评价物元模型,给出了基于关联函数的可拓评价方法,对企业竞争力的定性,定量综合评价方法进行了创新性研究。  相似文献   

7.
一种循环修正的组合评价方法   总被引:6,自引:0,他引:6  
提出了一种循环修正的组合评价方法.首先,对所研究的问题选取几种综合评价方法进行综合评价.其次,用Sperm an等级相关系数法检验几种综合评价法的一致性.进一步重复采用平均值法、Boarda法、C om peland法和模糊Board法对上述综合评价结果进行组合评价,直到标准差均收敛于0为止,得到最优的组合评价结果.最后以辽宁省2001年实际统计资料为例,对各地区的经济实力进行了综合评价和排序.  相似文献   

8.
综合评价的随机模拟求解算法及应用   总被引:1,自引:0,他引:1  
在经典的综合评价理论里,评价结论的信息形式通常是绝对的.本文认为这种绝对的结论形式阻碍了理论对实际问题本质的贴近,是产生“多评价结论非一致性”问题的重要原因.针对该问题,提出了一种基于“蒙特卡罗仿真”思想的随机模拟型综合评价求解算法,并对相应的排序方法进行了研究,该方法的特点是可产生带概率(可靠性)信息的评价结论,因而较绝对的结论形式从问题的可解释性方面拥有了更多的优势.因随机模拟求解方法具有独立性,作为示例,将其应用于“自下而上”的评价模式中,构建出一种新颖的自主式评价方法.最后,用一个算例验证了方法的有效性.  相似文献   

9.
主成分分析综合评价是国内较流行的一种综合评价方法,这里对主成分分析综合评价函数的五个质疑或断言,用主成分分析模型、主成分分析综合评价的合理性条件进行了讨论,结果:主成分分析综合评价函数是果,主成分及其包含的信息是因,不能用它们包含的信息比较后推断,因果关联的它们既应分别深入分析,又应结合分析,效果会更好.并结合实例说明:具有合理性条件的主成分分析综合评价改进步骤,更具有合理性和有效性.  相似文献   

10.
针对评价信息为多值中智数的多属性决策问题,提出基于最小最大相似度求解属性权重与标准区间求解专家权重的方法.该方法首先根据最小最大模型求解属性权重,将初始评价矩阵集结为综合决策矩阵,其次利用数字分析法求得标准区间,根据各专家与标准区间的相似度确定专家权重,再对综合评价矩阵集结得各方案的综合评价值,对综合评价值排序得最优方案,最后用实例说明了方法的有效性和适用性.  相似文献   

11.
The ultrasonic nondestructive evaluation of composite cylinders requires a thorough understanding of the propagation of waves in these materials. In this paper, the propagation of flexural and longitudinal guided waves in fiber-reinforced composite (FRC) rods with transversely isotropic symmetry properties is studied. The frequency equations obtained for free cylinders and the effect of increased fiber volume fraction (increased anisotropy) on the dispersion characteristics of the rod are explored. The numerical results reveal a number of previously unnoticed characteristics of dispersion curves for composite cylinders. The mode shapes of longitudinal waves propagating in glass/epoxy cylinders are also plotted. These plots can be used to choose an appropriate strategy for inspecting composite cylinders by ultrasonic nondestructive evaluation techniques. Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 43, No. 3, pp. 411–426, May–June, 2007.  相似文献   

12.
水资源配置的多属性特征使得在方案综合评价中依据不同的聚合方法,能够获得不完全一致的方案排序结果。本文从水资源配置方案评价的决策矩阵及方案排序结果中的信息量大小入手,利用信息熵理论和斯皮尔曼等级相关系数提出衡量水资源配置方案综合评价中信息损失的香农斯皮尔曼测度。并构造由2种权重(熵权法权重、证据理论权重)与3种评价模型(简单加权法、模糊优选法、TOPSIS)组合而成的6种综合评价模型。最后,将香农斯皮尔曼测度运用到天津市水资源配置方案综合评价过程中的信息损失的衡量,并与文献中的综合评价模型所得结果进行比较。结果表明,采用证据理论权重-模糊优选评价模型所得评价结果的绝对信息损失和相对信息损失最小。通过水资源配置方案综合评价中的信息损失测度研究,能够使得水资源配置方案综合评价过程更加透明,并为决策部门选取理想的水资源配置方案综合评价方法提供决策支持。  相似文献   

13.
针对复合土钉墙的安全评价问题,以复合土钉墙基坑支护技术规范为依据构建了安全评价指标体系,并在运用Theil指数确定安全评价指标权重的基础上,对复合土钉墙安全进行灰色综合评价,得出安全评价等级.为复合土钉墙安全评价提供了新思路.  相似文献   

14.
Zopounidis et al. used an ordinal regression analysis to assess an additive utility model and to obtain final ranking of a representative sample of commercial Greek banks [C. Zopounidis, D.K. Despotis, E. Stavropoulou, Multiattribute evaluation of Greek banking performance, Applied Stochastic Models and Data Analysis 11 (1995) 97–107]. In this paper, we reanalyze their data by means of a new multivariate analysis method called Co-plot, a two-dimensional graphic display technique designed to analyze observations (e.g., 16 banks) and attributes (e.g., 7 attributes) simultaneously. The method produces three results: (1) similarity among the banks by the composite of all attributes involved (five clusters are obtained), (2) the structure of correlations among the attributes (three clusters are obtained), and (3) the mutual relationships between the banks and the attributes. The banks are mapped into a partial order according to their (increased) performance to obtain their rating. The final ranking obtained by the Co-plot method differed from that obtained by Zopounidis et al.  相似文献   

15.
Improved bounds for effective transport properties of a random non-percolated composite with cylindrical fibres are developed by means of the security-spheres approach. The key point of the method is to obtain a solution for a regular composite that can be valid for all values of the volume fractions and properties of the components. For this aim we use the asymptotic homogenization method; a cell problem is solved by a modified version of the boundary shape perturbation technique.   相似文献   

16.
The main focus of the present paper is the estimation of the macroscopic stress–strain behavior of a particulate composite. A composite with a cross-linked polymer matrix in a rubbery state filled with an alumina-based mineral filler is investigated by means of the finite-element method. The hyperelastic material behavior of the matrix is described by the Mooney–Rivlin material model. Numerical models on the basis of unit cells are developed. The existence of a discontinuity (breaking) in the matrix at higher loading levels is taken into account to obtain a more accurate estimate for the stress–strain behavior of the particulate composite investigated. The numerical results obtained are compared with an experimental stress–strain curve, and a good agreement is found to exist. The paper can contribute to a better understanding of the behavior and failure of particulate composites with a polymer matrix.  相似文献   

17.
Improved bounds for effective transport properties of a random non-percolated composite with cylindrical fibres are developed by means of the security-spheres approach. The key point of the method is to obtain a solution for a regular composite that can be valid for all values of the volume fractions and properties of the components. For this aim we use the asymptotic homogenization method; a cell problem is solved by a modified version of the boundary shape perturbation technique.  相似文献   

18.
Conclusion We conducted a dilatometric study of three types of hybrid unidirectionally reinforced composites (organic-glass-, organic-carbon-, and carbon-glass-fiber plastics), each of which was represented by several batches differing in the relative content of the two types of fibers. The tests were performed on a specially-designed laboratory prototype. It was shown that, for the materials studied, the coefficient of linear expansion can be controlled by means of hybridization — by combining several types of fibers with positive and negative values of the coefficient of linear expansion in one composite. Analytic expressions for the coefficient that were obtained by generalizing a three-phase model of a two-component composite with isotropic fibers to the case of a hybrid composite with anisotropic fibers satisfactorily describe the experimental data.Translated from Mekhanika Kompozitnykh Materialov, No. 2, pp. 229–236, March–April, 1989.  相似文献   

19.
A two-scale analysis (TSA) method for predicting the heat transfer performance of composite materials with the random distribution of same-scale grains is presented. First the representation of the materials with the random distribution is briefly described. Then the two-scale analysis formulation of heat transfer behavior of the materials with random grain distribution of small periodicity is formally derived by means of  相似文献   

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