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《数学的实践与认识》2013,(16)
基于人们对事物选择处于犹豫不决时,易受他人选择的影响而产生从众选择的行为特征,分析直觉模糊数的犹豫部分对得分函数和精确函数的影响,通过累加和极限方法,定义直觉模糊数的累积得分函数和累积精确函数,进而提出一种基于新得分函数和精确函数的模糊多属性决策方法. 相似文献
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为更大程度的保留决策信息的原始性,针对决策过程决策信息的聚合、备选方案的比选问题,提出一种基于集成算子改进得分函数的区间直觉模糊多属性决策方法。首先,构建各决策者区间直觉模糊集评分矩阵,并根据模糊熵获得各决策者权重。其次,利用区间模糊集集成算子得到区间直觉模糊综合决策矩阵,进而选择Hamming距离表示方法,建立总离差最大化为目标的最优化模型客观确定属性权重。然后,基于得分函数的定义及性质将原始得分函数进行改进,获得各方案的得分区间矩阵,并将其与决策者属性进行综合得到综合得分区间。最后,根据区间数中心和半径的全序关系对方案的距离,计算每个方案的最终得分,并通过某公司选择投资企业算例验证该方法的可行性和有效性。 相似文献
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通过对区间直觉模糊数的犹豫区间进行讨论,提出了区间直觉模糊数的新得分函数和精确函数,并讨论新的得分函数具有的性质,在此基础上给出了区间直觉模糊数的一种新的排序方法.进而,结合区间直觉模糊加权平均算子给出了属性值为区间直觉模糊数的多属性决策方法,并通过算例阐明该方法的可行性和有效性. 相似文献
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将非线性半参数统计模型的概率密度函数族视为统计流形,利用微分几何方法,建立非线性半参数统计模型相对应的Hilbert空间,进而研究非线性半参数统计模型的估计函数问题.利用两类得分函数张成的子空间对Hilbert空间进行正交分解,进而讨论估计函数所在的集合,以及如何选取最优估计函数的问题.最后,通过实例分析来验证此方法的有效性. 相似文献
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主要研究了两类近似凸集的关系和性质.首先,举例说明两类近似凸集没有相互包含关系.其次,在近似凸集(nearly convex)条件下,证明了在一定条件下函数上图是近似凸集与凸集的等价关系.同时,考虑了近似凸函数与函数上图是近似凸集的等价刻画、近似凸函数与函数水平集是近似凸集的必要性,并用例子说明近似凸函数与函数水平集是近似凸集的充分性不成立.最后,基于近似凸函数和拟凸函数的概念,给出了近似拟凸函数的概念并研究了近似拟凸函数与水平集是近似凸集的等价刻画. 相似文献
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在区间直觉模糊环境和各准则的信息完全未知的条件下,本文提出了一个基于模糊熵和得分函数的多准则决策方法.基于区间直觉模糊集的准则形式,本文给出了模糊熵模型,从而可以确定各准则的权重.在决策方法方面,作者提出了区间直觉模糊集的加权记分函数和加权精确函数,解决了记分函数无法解决的加权问题的难题,同时给出了一种新的决策方法.最后,文章通过实例说明了该方法的可行性和有效性. 相似文献
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In this paper, we study quasi approximate solutions for a convex semidefinite programming problem in the face of data uncertainty. Using the robust optimization approach (worst-case approach), approximate optimality conditions and approximate duality theorems for quasi approximate solutions in robust convex semidefinite programming problems are explored under the robust characteristic cone constraint qualification. Moreover, some examples are given to illustrate the obtained results. 相似文献
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本文研究一类非光滑向量均衡问题(Vector Equilibrium Problem)(VEP)关于近似拟全局真有效解的最优性条件.首先,利用凸集的拟相对内部型分离定理和Clarke次微分的性质,得到了问题(VEP)关于近似拟全局真有效解的最优性必要条件.其次,引入近似伪拟凸函数的概念,并给出具体实例验证其存在性,且在该凸性假设下建立了问题(VEP)关于近似拟全局真有效解的充分条件.最后,利用Tammer函数以及构建满足一定性质的非线性泛函,得到了问题(VEP)近似拟全局真有效解的标量化定理. 相似文献
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AbstractCertain notions of approximate weak efficient solutions are considered for a set-valued optimization problem based on vector and set criteria approaches. For approximate solutions based on the vector approach, a characterization is provided in terms of an extended Gerstewitz’s function. For the set approach case, two notions of approximate weak efficient solutions are introduced using a lower and an upper quasi order relations for sets and further compactness and stability aspects are discussed for these approximate solutions. Existence and scalarization using a generalized Gerstewitz’s function are also established for approximate solutions, based on the lower set order relation. 相似文献
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Akbar Hashemi Borzabadi Mohammad Heidari 《Journal of Mathematical Modelling and Algorithms》2012,11(1):77-88
In this paper, optimal control problem (OCP) governed by the heat equation with thermal sources is considered. The aim is
to find an optimal control which puts the system in a finite time T, into a stationary regime and to minimize a general objective function. To obtain an approximate solution of this problem,
a partition of the time-control space is considered and the discrete form of the problem is converted to a quasi assignment
problem. Then by using an evolutionary algorithm, an approximate optimal control function is obtained as a piecewise linear
function. Numerical examples are given to show the proficiency of the presented algorithm. 相似文献
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In this paper, we establish an approximate functional equation for the Lerch zeta function, which is a generalization of the Riemann zeta function and the Hurwitz zeta function. 相似文献
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Chunpeng Wang 《Journal of Evolution Equations》2010,10(1):163-193
In this paper we consider the approximate controllability of a class of degenerate semilinear systems. The equations may be
weakly degenerate and strongly degenerate on a portion of the lateral boundary. We prove that the control systems are approximately
controllable and the controls can be taken to be of quasi bang-bang form. 相似文献
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There is an increasing interest in the study of optimality conditions of approximate solutions for nonlinear optimization problems. In this paper, relationships between approximate optimal values and approximate roots of a nonlinear function are explored via a nonlinear Lagrangian function. Almost approximate optimal solutions are investigated by means of nonlinear Lagrangian functions. 相似文献