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针对属性权重已知、属性值为毕达哥拉斯犹豫模糊不确定语言变量的多属性决策问题,提出一种前景理论和消去与选择转换法(ELECTRE)相结合的多属性决策方法.首先给出毕达哥拉斯犹豫模糊不确定语言集的定义,包括得分函数、距离测度和运算法则;然后将前景理论引入该决策环境下,构建前景价值矩阵,运用传统ELECTRE法求得一致矩阵和矛盾矩阵,并对其进行转化构建前景优/劣势判断矩阵,进而求得总优/劣势值以确定备选方案的优劣排序;最后通过算例分析验证所提出方法的有效性和可行性,并与该决策环境下的传统ELECTRE法进行对比,表明了该方法的优越性和实用性. 相似文献
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当代摄影的空间,不可忽略的就是新生代的影像世界。因为他们的存在,不仅仅是在于当下,更重要的是指向未来。于是有人喜欢用"新锐"一词,凸显他们的魅力和影响。这里,我们不妨就从"新锐"说起…… 相似文献
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提出一种模糊隶属度函数来对个体的不确定运动状况进行建模,进而提出不确定环境中的群体模型,这种基于模糊概念的建模方法不会无谓地牺牲个体的可运动空间,可尽量减少群体行为建模时对个体邻域内其他个体运动状况的约束强度,而不确定群体模型能保证在不确定环境中实现稳定收敛的群体行为,仿真结果表明,通过对个体的运动位置进行模糊处理,有利于在动态不确定环境中保持稳定的群体行为。 相似文献
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针对不确定噪声下的非线性系统状态估计问题, 本文提出了一种基于轴对称盒空间滤波的状态估计方法. 首先, 利用轴对称盒空间包裹线性化过程带来的误差项, 将状态函数线性化误差轴对称盒空间与噪声轴对称盒空间求取闵可夫斯基和, 得到干扰误差轴对称盒空间; 随后, 利用状态量、线性误差和测量噪声的轴对称盒空间的闵可夫斯基和, 得到系统状态预测集; 进而, 利用轴对称盒空间边界正交的性质, 将盒空间拆分为多组超平面, 构造测量更新的约束条件并得到集员包裹. 本文所提方法相比传统的椭球滤波方法而言, 降低了算法的复杂度, 减少了包裹状态可行集和线性化过程带来的余, 获得了更加紧致精确的系统状态集. 最后, 采用非线性弹簧–质量–阻尼器系统验证了本文所提算法的有效性. 相似文献
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陈倩 《计算机工程与应用》2012,48(33):18-23
基于我国银行业所面临的数据匮乏、信息披露制度不完善等问题,国际上先进的统计量化方法并不能完全适用于对我国操作风险的评价,从定性和定量相结合的角度出发,针对操作风险评价中的多属性群决策问题,提出一种在区间模糊语言信息下基于不确定的拓展有序加权平均算子(UEOWA)和不确定语言混合集结算子(ULHA)的多专家多属性商业银行操作风险评价方法,构建基于区间模糊语言的评价集来描述专家不精确、难量化的意见,梳理评价思路,设计评价步骤,通过实例验证了该方法的可操作性和有效性。 相似文献
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In this paper, a new adaptive fuzzy backstepping control approach is developed for a class of nonlinear systems with unknown time-delay and unmeasured states. Using fuzzy logic systems to approximate the unknown nonlinear functions, a fuzzy state observer is designed for estimating the unmeasured states. On the basis of the state observer and applying the backstepping technique, an adaptive fuzzy observer control approach is developed. The main features of the proposed adaptive fuzzy control approach not only guarantees that all the signals of the closed-loop system are semiglobally uniformly ultimately bounded, but also contain less adaptation parameters to be updated on-line. Finally, simulation results are provided to show the effectiveness of the proposed approach. 相似文献
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In this paper, we investigate state estimations of a dynamical system in which not only process and measurement noise, but also parameter uncertainties and deterministic input signals are involved. The sensitivity penalization based robust state estimation is extended to uncertain linear systems with deterministic input signals and parametric uncertainties which may nonlinearly affect a state-space plant model. The form of the derived robust estimator is similar to that of the well-known Kalman filter with a comparable computational complexity. Under a few weak assumptions, it is proved that though the derived state estimator is biased, the bound of estimation errors is finite and the covariance matrix of estimation errors is bounded. Numerical simulations show that the obtained robust filter has relatively nice estimation performances. 相似文献
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TONG ShaoCheng & LI YongMing 《中国科学:信息科学(英文版)》2010,(2):307-324
In this paper, an adaptive fuzzy output feedback control approach based on backstepping design is proposed for a class of SISO strict feedback nonlinear systems with unmeasured states, nonlinear uncertainties, unmodeled dynamics, and dynamical disturbances. Fuzzy logic systems are employed to approximate the nonlinear uncertainties, and an adaptive fuzzy state observer is designed for the states estimation. By combining backstepping technique with the fuzzy adaptive control approach, a stable adaptive fuzzy... 相似文献
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In this paper, a novel Krein space approach to robust estimation for uncertain systems with accumulated bias is proposed. The bias is impacted by system uncertainties and exists in both state transition and observer matrices. Initial conditions and cross-correlated uncertainty inputs are described by the sum quadratic constraint (SQC). Without modifying the SQC, the minimal state of the SQC is obtained through Krein space method. The inertia condition for a minimum of a deterministic quadratic form is derived when the coefficient of observer uncertainty input is non-unit matrix. Recursions of Krein space state filtering and bias filtering are developed respectively. Since the cross correlation between uncertainties is considered, a cross correlation gain is introduced into the posteriori estimator. Finally, a numerical example illustrates the performance of the proposed filter. 相似文献
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区间灰色不确定语言多属性群决策方法 总被引:1,自引:0,他引:1
《计算机科学与探索》2016,(1):93-102
针对属性值为区间灰色不确定语言信息的多属性群决策问题,在定义区间灰色不确定语言变量及其运算规则的基础上,给出了3种几何加权集结算子,由区间灰色不确定语言几何加权算子集结各决策者给出的决策矩阵得到群体决策矩阵。在属性权重已知的情形下,基于该算子集结单个决策者给出的属性权重向量得到群体属性权重向量;在属性权重完全未知的情形下,采用信息熵法确定属性权重向量。采用区间灰色不确定语言混合几何加权算子集结各属性评价信息,得到各方案的综合评价值,基于区间灰色不确定语言变量大小比较的方法得到方案排序结果。算例分析表明了该方法的有效性与可行性。 相似文献