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本文给出了一种构造给定直径d和围长g的测地块的方法.它是文[1]中构造法的推广,解决了文[1]中待研究的几个问题.同时,对文[1]中的一个错误进行了修正. 相似文献
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修正多重尺度法在求解圆薄板具有很大挠度问题时的应用 总被引:1,自引:1,他引:0
本利用修正的多重尺度法^[1~2]重新研究固支圆薄板在均匀压力作用下,挠度很大时解的渐近性态。结果表明与钱伟长教授用首创的合成展形法求解该问题^[3]的结果相一致,但较后更简捷。本结果还表明[4]中所指出[1~2]方法的局限性是非本质的,并改正[3]中一些计算错误。 相似文献
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也谈费马─斯坦勒尔问题刘凯年(重庆师范学院数学系630047)文献[1](见本刊1994年第3期)、[2]、[3]用不同方法解决了费马一斯坦勒尔问题.但[3]为实验解,未给出严格的数学证明,[1]、[2]的方法又比较繁难,且[1]的方法很难为中学生所... 相似文献
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修正的完全近似法的改进形式及其应用 总被引:2,自引:0,他引:2
本文对文[1]、[2]提出的修正的完全近似法作了改进:将自变量变换中的待定非线性泛函用特定非线性函数来代替,使运算简化;给出一种新的变换形式,解决了修正的完全近似法往往导出现长期项的问题。 相似文献
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本文给出了基于Chebyshev结点的高阶Hermite-Fejer插值多项式的两种修正形式,并证明了这两种修正对f∈Lw^p均可给出逼近阶w(f,1/n)p.同时文中也给出了基于Chebyshev结点的Her-mite-Fejer及Hermite插值多项式对C[-1,1]及C^r[-1,1]类函数的逼近阶。 相似文献
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Demyanov和Rubinov在[1]中给出了一个次线性逼近定理.本文对该定理的证明进行了修正. 相似文献
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In a very recent note by Gao and Ni [B. Gao, M.F. Ni, A note on article “The evidential reasoning approach for multiple attribute decision analysis using interval belief degrees”, European Journal of Operational Research, in press, doi:10.1016/j.ejor.2007.10.0381], they argued that Yen’s combination rule [J. Yen, Generalizing the Dempster–Shafer theory to fuzzy sets, IEEE Transactions on Systems, Man and Cybernetics 20 (1990) 559–570], which normalizes the combination of multiple pieces of evidence at the end of the combination process, was incorrect. If this were the case, the nonlinear programming models we proposed in [Y.M. Wang, J.B. Yang, D.L. Xu, K.S. Chin, The evidential reasoning approach for multiple attribute decision analysis using interval belief degrees, European Journal of Operational Research 175 (2006) 35–66] would also be incorrect. In this reply to Gao and Ni, we re-examine their numerical illustrations and reconsider their analysis of Yen’s combination rule. We conclude that Yen’s combination rule is correct and our nonlinear programming models are valid. 相似文献
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通过用方差定义左右修正量,将点值不确定推理真值传播计算方法推广到区间值情形,提出了一种区间值不确定推理真值传播计算方法.本文所提出的方法表达式简单,易于理解与计算. 相似文献
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Lianmeng Jiao Quan Pan Yan Liang Xiaoxue Feng Feng Yang 《Central European Journal of Operations Research》2016,24(1):87-106
The combination of sources of evidence with reliability has been widely studied within the framework of Dempster-Shafer theory (DST), which has been employed as a major method for integrating multiple sources of evidence with uncertainty. By the fact that sources of evidence may also be different in importance, for example in multi-attribute decision making (MADM), we propose the importance discounting and combination method within the framework of DST to combine sources of evidence with importance, which is composed of an importance discounting operation and an extended Dempster’s rule of combination. Three evidence combination axioms are proposed and explored to uncover the differences between reliability and importance in evidence reasoning. Furthermore, a general scheme is proposed for combination of sources of evidence with both reliability and importance. An example of car performance evaluation is studied to show the efficiency of the new general scheme. 相似文献
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本文给出了反对称自变量线性各向同性张量函数表示定理的两个证明:一个证明是新的;另一个基本上沿用[1]的思路,但较简短,且纠正了[1]的一个错误. 相似文献
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将多参数广义不确定度的概念引入串联系统参数不确定度的传递问题中,建立了串联系统多参数广义不确定度传递模型,该模型不仅揭示了参数不确定度在传递过程中的变化情况,传递细节表明传递矩阵元素对最后的传递结果有重要影响.文中阐述了传递矩阵的特征以及各个子系统在串联系统中的主次作用.针对串联系统建立了多参数广义不确定度多反馈控制模型,提出了针对单个系统、两个子系统、多个子系统多个层次的反馈控制模型.模型的提出从理论上说明了当对子系统传递矩阵进行修正时,输出参数不确定度的变化及其上界的面积范数,为工程实际提供了一个良好的理论模型支撑. 相似文献
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《Journal of Applied Mathematics and Mechanics》1998,62(2):309-314
A modification of Adomian's method [1–4], based on the use of Padé approximants (5], is proposed. Examples are considered: a non-linear differential equation, a rectangular plate under transverse pressure, and a combination of transverse pressure and longitudinal compression. 相似文献
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B. V. Kostrov 《Journal of Applied Mathematics and Mechanics》1966,30(6):1241-1248
In all problems of unsteady crack propagation which have been solved to date [1 to 3], it has been assumed that the crack propagates at a constant speed. This assumption was not prompted by physical considerations of the problem, but by the methods of solution, therefore, the applicability of the results is limited. It would be more realistic to consider the speed of crack propagation as a function of time based on explicit physical hypotheses. Unfortunately, the general case of the resultant problem cannot be solved by existing methods. However, the problem of longitudinal shear cracks i.e. the plane problem in which the displacement is parallel to the crack boundary, may be solved for an arbitrary given variation in crack propagation speed, utilizing the method developed in connection with the theory of supersonic flows [4 and 5].
Note that equilibrium problems of longitudinal shear cracks have been studied in [6 and 7]. 相似文献
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Jürg Kohlas 《Annals of Operations Research》1991,32(1):67-113
Shafer's theory of evidence has found much interest as a means to represent and manage uncertainty in reasoning. It is shown that an important part of this theory can be recast as a theory of reasoning with unreliable arguments. This places the problem within the framework of the reliability theory of binary, monotone systems. Methods from this well developed theory can thus be used in the context of reasoning under uncertainty. This opens new computational perspectives for combining evidence. In particular, it allows for a backward chaining approach in judging hypotheses in the light of unreliable information. As a consequence, mechanisms to explain the judgments of hypotheses can be designed. The approach will be illustrated especially by the problem of reasoning in inference networks with uncertain rules and uncertain facts. 相似文献
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Alain Chateauneuf 《Annals of Operations Research》1994,52(1):1-20
The aim of this paper is to present in a unified framework a survey of some results related to Choquet Expected Utility (CEU) models, a promising class of models introduced separately by Quiggin [35], Yaari [48] and Schmeidler [40, 41] which allow to separate attitudes towards uncertainty (or risk) from attitudes towards wealth, while respecting the first order stochastic dominance axiom. 相似文献