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对系数为区间数的多目标线性规划问题,在区间数序关系下提出了序关系评价函数概念,并给出了一个命题,用此方法可将复杂的多目标线性规划转化为简单的单目标规划。 相似文献
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中学阶段所遇到的不等式都能化归为有理不等式,因而正确快捷地解有理不等式成为学生的基本能力要求;通过对“区间符号”概念的界定及原理的阐述,给出了有理不等式的简便、快捷的解法——区间符号法,对高次不等式(组)和分式不等式(组)更显其优越性,学生易学、易懂、易用,效果甚好。 相似文献
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本文系统地介绍了可分离函数的非线性规划问题的近似解法，并对近似解法的收敛性给出了较为详细的证明。 相似文献
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文章用区间数描述了证券的收益率、投资风险和证券流动性的不确定性,基于绝对偏差风险函数和极大极小原则建立了投资组合选择的区间规划模型,并利用区间数的两种序关系将模型转化为普通的参数线性规划问题进而求得其解. 相似文献
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杨文锟 《中国科教创新导刊》2013,(30):114-114,119
现行高中教材介绍的线性规划问题的解法,适用于解决一般的问题,对于其中一类问题,如果每次都用这种方法来解,就显得麻烦,笔者通过观察,得出此类问题的一种解法,在此提出,希望得到同行的指教。 相似文献
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<正>本文介绍可行域为平行四边形的线性规划问题的一种解法,并试图澄清对此类解法的一些模糊认识.先看1983年一道全国数学联赛题: 相似文献
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结合直接方法和假设方法得到了河床流体模型方程及其推广的一些显式精确行波解，这些解包括孤立波解、奇异行波解和三角函数状周期波解。 相似文献
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杨立波 《洛阳师范学院学报》2013,(11):9-11
对G'/G展开法进行了扩展,并将该方法应用到非线性差分微分方程的求解领域,通过借助符号计算系统Mathematica,得到了修正的Volterra格子方程的多组含参的新的精确解,包括双曲函数解、三角函数解和有理函数解. 相似文献
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微分差分KdV方程新的类多孤子解 总被引：3，自引：0，他引：3
This article is concerned with the Hirota direct method for studying novel multisoliton solutions of the discrete KdV equation.First the Hirota method was introduced,then the novel multisoliton solutions were obtained.Simultaneously the figures of the novel one-soliton solution and two-solton solution were given and the singularity of the novel multisoliton solutions was discussed.Finally it was pointed out that the multisoliton solutions with sigularity can be called soliton-like solutions. 相似文献
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张大军 《上海大学学报(英文版)》2004,8(1):4-7
N-soliton solutions in the Wronskian form for the KdV equation with loss and nonuniformity terms were obtained. New rational-like solutions and mixed solutions were further derived. All these solutions were verified by direct substitutions into bilinear equation. 相似文献
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文章研究一类时滞差分方程的平衡解与解的渐近性,利用单调有界原理得到解的渐近性的一些充分条件。 相似文献
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ZHANG Mei ZHANG Wen-jing 《浙江大学学报(A卷英文版)》2007,8(4):660-664
This paper applies the EXP-function method to find exact solutions of various nonlinear equations. Tzitzeica- Dodd-Bullough (TDB) equation was selected to illustrate the effectiveness and convenience of the suggested method. More generalized solitonary solutions with free parameters were obtained by suitable choice of the free parameters, and also the obtained solitonary solutions can be converted into periodic solutions. 相似文献
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Learning from worked examples is an effective learning method in well-structured domains. Can its effectiveness be further enhanced when errors are included? This was tested by determining whether a combination of correct and incorrect solutions in worked examples enhances learning outcomes in comparison to correct solutions only, and whether a mixture of correct and incorrect solutions is more effective when the errors are highlighted. In addition, the effectiveness of fostering self-explanations was assessed. In Experiment 1, the participants learned to solve probability problems under six conditions that constituted a 2 × 3-factorial design (Factor 1: correct and incorrect solutions with highlighting the errors vs. correct and incorrect solutions without highlighting the errors vs. correct solutions only; Factor 2: prompting written self-explanations vs. no prompts). An aptitude-treatment interaction was found: providing correct and incorrect solutions fostered far transfer performance if learners had favourable prior knowledge; if learners had poor prior knowledge correct solutions only were more favourable. Experiment 2 replicated this interaction effect. Thus, a mixture of correct and incorrect solutions in worked examples enhanced learning outcomes only for “good” learners. In addition, Experiment 2 showed that confronting learners with incorrect solutions changed the quality of their self-explanations: on the one hand, new types of effective self-explanations could be observed, but on the other hand the amount of the very important principle-based self-explanations was substantially reduced. A possible measure to prevent this negative side effect of incorrect solutions is discussed. 相似文献
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在研究复杂产品系统规划分解、整体优化的基础上,提出了MDO中学科的数学描述方法;根据学科优化模型和系统整体优化模型,结合库恩—塔克极值理论,提出并证明了MDO中学科最优解直接组合成为系统整体最优解的3个条件,丰富了复杂产品系统的优化理论,分析了现实中系统整体最优解很难由学科最优解直接组合而得到的原因,得到了整体优化与学科优化的辩证关系,有助于寻找复杂产品系统的整体优解。 相似文献
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陈世军 《福建工程学院学报》2018,(4):365-371
借鉴求线性矩阵方程组同类约束解的MCG算法（修正共轭梯度法）,建立了求多个未知矩阵的线性矩阵方程组的一种异类约束解的MCG1-3-5算法,证明了该算法的收敛性。该算法不仅可以判断矩阵方程组的异类约束解是否存在,而且在有异类约束解,且不考虑舍入误差时,可在有限步计算后求得矩阵方程组的一组异类约束解;选取特殊初始矩阵时,求得矩阵方程组的极小范数异类约束解。同时还能求取指定矩阵在该矩阵方程组异类约束解集合中的最佳逼近。算例表明,该算法有效。 相似文献
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孙韬 《重庆大学学报(英文版)》2005,4(1):15-18
1 Introduction In the past 20 years with the rapid development of VLSI (very large scale integration) circuits and continual spread of electric power system scale, theories on transmission lines have become an important research field where finding the analytic solutions to lossy transmission line equations remains a tough nut. Since the mathematical tool cannot provide effective help, there is no universal method to solve transmission line equations [1]. A number of researchers have obtaine… 相似文献