一类新的多维函数新式的单调类定理

本文研究了多维函数形式的单调类定理问题.利用类比的方法,定义了多维函数形式的λ族,单调族,获得了相应的多维函数形式的单调类定理,推广了λ族,单调族的一维函数形式的单调类定理,并将其用于可选过程,从而建立了对应的单调类定理.     

高考函数图像题考查类型及方法解析

函数图像是函数关系中最为直观的表述形式,也是函数定义的几何形式,它全面反映了有关函数关系的概念和性质,是研究函数性质的重要工具．因而也成为高考函数命题最具新颖的题型之一．下举例谈谈高考函数图像题的常见考查类型,以飨读者．     

Milloux不等式精简形式的推广及应用

主要讨论了Milloux不等式的精简形式的推广问题,借助代数体函数的第二基本定理,得到了关于代数体函数的精简形式的Milloux不等式的一般形式,推广了Milloux不等式的精简形式的结论,并由此得到了关于代数体函数及其导数的涉及拟Borel例外值的性质,推广了亚纯函数的相关性质.     

连幂式插值

根据连续幂指形式的函数,提出了连续幂指形式的函数插值的概念,简称连幂式插值,用构造式方法得到了满足插值条件的连幂式插值函数。最后,通过一个算例与连分式插值函数做了对比。     

多种模糊值函数微分定义的统一表述

针对模糊值函数微分有多种定义,并且在形式难以得到统一的现状,提出了模糊数的广义限定性运算.在此基础上,利用[-1,1]上同序标准单调函数类与模糊实数空间的同胚性质,给出了广义限定差意义下的模糊值函数微分定义,并证明了这个定义与借助于扩张原理形式、借助于Hukuhara差形式和借助于模糊结构元形式的三种模糊值函数微分定义是等价的,进而得到了基于模糊结构元方法的模糊值函数微分定义的统一表述.     

例谈函数思想在解题中的应用

函数是高中数学的重要内容之一,其理论和应用涉及各个方面,是贯穿整个高中数学的一条主线.这里所说的函数思想具体表现为:运用函数的有关性质,解决函数的某些问题;以运动和变化的观点分析和研究具体问题中的数学关系,通过函数的形式把这种关系表示出来并加以研究,从而使问题获得解决;对于一些从形式上看似非函数的问题,经过适当的数学变换或构造,使这一非函数的问题转化为函数的形式,并运用函数的有关概念和性质来处理这一问题,进而使原数学问题得到顺利解决.尤其是一些方程和不等式方面的问题,可通过构造函数很好地处理.     

Cauchy氏不等式的转化形式

<正> Mandelbrojt氏关于Dirichlet氏多项式逼近解析函数的精确度和系数的关联性的不等式本质上是解析函数理论中的 Cauchy 氏不等式的转化形式,因此它对于实函数构造及准解析性和解析函数的异点理论具有类似的作用;Cauchy 氏不等式的这种作用所证明的结果其转化形式也就可以用 Cauchy 氏不等式的转化形式加以解决.     

多元向量函数的中值定理及应用

中值定理是可微函数的重要性质,是证明某些等式和不等式的重要工具,而等式形式的向量函数的微分中值定理一般是不成立的,通常只能得到微分中值不等式.本文从一元函数的Newton-Leibniz公式出发,证明了一个多元向量函数等式形式的积分型中值定理.该定理揭示了多元向量函数等式形式的微分中值定理不成立的原因,也蕴含了微分中值不等式.     

分区域函数的二重积分法

就绝对值函数、极大极小项函数及取整函数三种典型形式讨论分区域函数二重积分的一般方法,并借助实例给予说明．     

一类非对称各向同性张量函数导数的不变表示

将Dui和Chen于2004年提出的求解对称各向同性张量函数导数的方法推广到一类满足可交换条件的非对称各向同性张量函数情况,此类函数比以往研究的更具一般性．在有3个不同特征根时,由可交换性引进张量函数相对应的标量函数,进而求得此类非对称各向同性张量函数及其导数的不变表示形式．在2或3重特征根时,利用求极限的办法给出此类张量函数及其导数的表示形式．     

基于图论和遗传算法的终端扇区划分方法

为了均衡终端区扇区的工作负荷,保障扇区边界的合理性,研究了终端扇区的划分方法.针对建立的扇区划分数学模型,提出了3阶段的划分方法.首先,采用voronoi图和遗传算法完成初始划分,实现均衡负荷的目标;其次,提出了基于voronoi图和基于maklink图的2种扇区二次划分方法,满足最小飞行时间及最小距离约束;最后,应用分段线性拟合的方法消除扇区边界的锯齿状,以及满足扇区凸形约束.以广州终端为例进行了仿真计算.应用提出的方法,给出了2种划分结果,都能够使得各扇区的工作负荷在2880s以内,差值不超过350s,扇区边界较为平滑,且计算时间明显减少.仿真计算结果说明方法是可行和有效的,也为使用者提供了灵活的选择.     

战时备件配送的MDVRPTW问题研究

战时备件配送的车辆调度是提高装备保障效率的关键因素.以装备效能损失最小化为车辆调度的目标,建立了问题的M DVRPTW模型,并应用蚁群算法对问题进行了求解.算法中,根据问题特征改进了状态转移规则,设计了串行和并行两种路线构造方法,并应用局部搜索模块对蚂蚁构造的路线进行改进.对算例的计算实验表明,串行路线构造方法在精度和速度两方面均优于并行路线构造方法.     

Mathematics teaching in French écoles normales primaires, 1830–1848: social and cultural challenges to the training of primary school teachers

In the nineteenth century, the French education system, and teaching itself, was organized according to the social class the pupils came from: primary education was for the working classes, and secondary education was for the wealthier classes. In relation to this ??educational duality?? this paper looks at the mathematics teaching provided in the écoles normales primaires (primary teacher training colleges), which developed in France in the 1830s to train future (male) primary school teachers. What, precisely, was the content of this teaching? How was it organized? In what spirit and for what purpose was it provided? The aim of the paper is to show how these schools participated in the construction of a specifically primary mathematics culture for the education of the children from the lower classes, as distinct from the scholarly culture of secondary education.     

On the Ulam stability of Jensen and Jensen type mappings on restricted domains

In 1941 Hyers solved the well-known Ulam stability problem for linear mappings. In 1951 Bourgin was the second author to treat this problem for additive mappings. In 1982-1998 Rassias established the Hyers-Ulam stability of linear and nonlinear mappings. In 1983 Skof was the first author to solve the same problem on a restricted domain. In 1998 Jung investigated the Hyers-Ulam stability of more general mappings on restricted domains. In this paper we introduce additive mappings of two forms: of “Jensen” and “Jensen type,” and achieve the Ulam stability of these mappings on restricted domains. Finally, we apply our results to the asymptotic behavior of the functional equations of these types.     

基于相对隶属度的织物风格模糊聚类分析

分析比较了统计数学、模糊数学和灰色数学在织物风格分析中的缺陷.特别针对模糊数学需人为确定隶属函数的缺陷提出采用基于相对隶属度的织物风格模糊聚类分析方法.以相对隶属度矩阵和模糊聚类中心矩阵的迭代求解为依据,对苎麻等十种织物的风格测试参数进行了聚类分析.通过聚类计算得到了织物相对类别特征值的聚类结果.经验证认为该结果符合客观实际和人们的感知经验.     

Shapiro polynomials of the second kind

In this work by replacing the initial data in recursive relations the Shapiro polynomials of the second kind were introduced and their relation to the Shapiro polynomials of the first kind was established. In addition to the results similar to the known for the Shapiro polynomials of the first kind the following was defined: the relation was established between the coefficients of the basic and complementary polynomials of the first and second kind, namely, their pairwise orthogonality was proved and the number of the positive coefficients for all polynomials was counted.     

基于BalanceCascade-GBDT算法的类别不平衡虚假评论识别方法

虚假评论是电商发展过程中一个无法避免的难题. 针对在线评论数据中样本类别不平衡情况,提出基于BalanceCascade-GBDT算法的虚假评论识别方法. BalanceCascade算法通过设置分类器的误报率逐步缩小大类样本空间,然后集成所有基分类器构建最终分类器. GBDT以其高准确性和可解释性被广泛应用于分类问题中,并且作为样本扰动不稳定算法,是十分合适的基分类模型. 模型基于Yelp评论数据集,采用AUC值作为评价指标,并与逻辑回归、随机森林以及神经网络算法进行对比,实验证明了该方法的有效性.     

On the Ulam stability of mixed type mappings on restricted domains

In 1941 D.H. Hyers solved the well-known Ulam stability problem for linear mappings. In 1951 D.G. Bourgin was the second author to treat the Ulam problem for additive mappings. In 1982-1998 we established the Hyers-Ulam stability for the Ulam problem of linear and nonlinear mappings. In 1983 F. Skof was the first author to solve the Ulam problem for additive mappings on a restricted domain. In 1998 S.M. Jung investigated the Hyers-Ulam stability of additive and quadratic mappings on restricted domains. In this paper we improve the bounds and thus the results obtained by S.M. Jung, in 1998. Besides we establish the Ulam stability of mixed type mappings on restricted domains. Finally, we apply our recent results to the asymptotic behavior of functional equations of different types.     

A Spectral Method for a Class of System of Multi-Dimensional Nonlinear Wave Equations

In [1,2], the problem of three-dimensional soliton of a class of system for three-dimensional nonlinear wave equations was investigated, and the existence and stability of three-dimensional soliton was proved. In [3] the system discusses in [1,2] was generalized and a more general class of system of multi-dimensional nonlinear wave equations were studied. It was proved that the solution of its initial-boundary value problem was well posed under some conditions. This system has been studied by the finite difference method and the finite element method [4,5]. In this paper, we take the trigonometric functions as a basis to derive a spectral method for the system and give a strict error analysis in theory.     

在一个半无穷柱体上的非标准Stokes流体方程的二择一问题

考虑了定义在半无限柱体上的非标准Stokes流体方程的初边值问题,其中在柱体的有限端施加非线性边界条件,在柱体的侧面上满足零边界条件.在初始条件中参数的适当范围内,利用微分不等式技术,得到了Stokes流体方程的二择一结果.在衰减的情况下,证明了"全能量"可以由已知数据项控制.