基于ANP的装备质量管理风险评估模型

根据装备质量管理的特点对装备质量管理的风险因素进行了分析,依据指标体系的设计原则建立了装备质量管理风险评估的指标体系,并给出了基于网络层次分析法和粒子群优化算法的的装备质量管理风险评估指标权重值的确定方法.并给出了实例分析.     

基于多目标粒子群算法的电梯备件采购配置

电梯备件采购配置问题是典型.的多目标、多约束、非线性规划问题.针对该问题,根据维修BOM配置出所需采购的备件清单,并得到备件的损坏率及消耗率.最后,提出了一种多目标粒子群算法,并运用算法对某一待采购备件的配置问题进行了优化求解.实例的结果表明,对该类问题,算法能快速准确地得到最优的解.     

建设项目风险评价的群体决策矩阵方法

建设项目在政治、环境、经济、施工、安全等方面的风险评估的群决策过程中,各利益相关群体对于候选方案的每个属性都可以提出自己的个体决策信息,采用乘性加权集结算子构造群体决策矩阵,并判断群体决策矩阵与个体决策矩阵之间的相似度差异值,指导个体决策矩阵的修正,完成个体意见的一致化,得到最终确定评价方案的风险顺序.实例分析的结果表明,采用计算方法有利于提高多利益主体对建设项目风险评价的群决策过程中的综合满意度.     

基于偏好的供应链不确定型风险模糊评估方法研究

提供一种供应链不确定型风险新的主观评估方法.本文在分析供应链不确定型风险评估中含有一定偏好特性的基础上,利用模糊理论和风险评估方法建立数学模型并求解,得出供应链风险水平,最后利用实例验证了方法的可行性和准确性.利用模糊理论和风险评估方法是评估供应链不确定型风险的有效方法.     

基于熵权理论的模糊风险评估方法在网络系统中的应用

针对信息系统风险评估中过分依赖主观赋值的现象,提出一种基于熵权理论的模糊风险评估方法,并将其应用于校园网络系统风险评估.构建了校园网络系统风险评估的递阶层次结构模型,结合层次分析法和模糊逻辑法对各风险因素的风险值进行分析,评价系统中值得关注的风险因素.在此基础上通过熵权理论计算整个系统的风险度以评价校园网络系统的总体风险情况,通过实例分析表明该方法可行有效.     

基于熵权TOPSIS模型的配电网风险评估实证研究

配电网作为直接面向用户的关键环节,是目前提高供电系统运行水平的关键环节,对配电网进行风险评估具有重要的现实意义.通过实际调研,综合考虑了配电网风险来源的各个因素,由此构建了配电网风险评估指标体系,包含五个一级指标和十九个二级指标.将熵权法和TOPSIS进行有效结合,建立了配电网风险评估模型,并对L市8家供电公司管辖的配电网进行定量分析,验证了所建立的配电网风险评估指标体系和评估模型的合理性与实用性,分析找出配电网风险来源,为配电网的管理提供参考.     

供应中断风险下制造商的后备采购与改善努力策略比较研究

在供应中断风险环境下,对制造商的后备采购策略和改善努力策略进行了比较分析.研究发现,制造商在改善努力策略时向主供应商的采购数量恒大于在后备采购策略时的采购数量.改善努力与后备采购策略的收益差总是随着改善努力成本投入的增大而呈现出递减的规律.当努力成本投入变得不经济时,制造商将放弃对主供应商的改善努力.     

装备采购费用估算在采购合同谈判中的应用

航天装备采购费用估算是航天装备采购管理工作的重要组成部分.采购合同谈判是航天装备采购工作的重要环节.本文研究在可靠性增长费用和供货方利润固定的情况下,如何确定采购费用的上限.该结果有利于航天装备采购部门在采购合同谈判时把握主动权,控制采购费用增长.     

基于电子交易市场的最优采购策略

随着电子交易市场的发展,企业在传统的远期合约采购基础上,开始从现货市场采购产品.在假定制造商通过远期合约和现货市场采购产品的情况下,研究了影响市场需求和现货市场价格的公共因子与特殊因子对制造商决策的影响.首先建立了最优采购策略的数学模型,其次对所建立的数学模型进行了求解,最后结合数值例子进行了灵敏度分析.研究表明:在相...     

基于梯形模糊综合分析法的弹药维修安全风险评估

针对弹药维修的复杂性和特殊性,提出了一种基于梯形模糊综合分析法的弹药维修安全风险评估的方法.从环境、管理、人员、设备和物资等5个方面考虑,建立了弹药维修安全风险评估指标体系;鉴于人判断的模糊性和判断矩阵一致性检验要求,采用了基于梯形模糊数期望值的层次分析法确定指标的权重系数;建立了基于梯形模糊综合分析法的弹药维修安全风险评估模型.通过对某弹药维修工厂的实例分析证明,所建立的弹药安全风险评估模型合理、科学、有效,能够为制定相应的法规提供理论的支撑.     

RECENT PROGRESS ON SPHERICAL HARMONIC APPROXIMATION MADE BY BNU RESEARCH GROUP ——In memory of Professor Sun Yongsheng

As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his guidance and encouragement his students started the research on spherical harmonic analysis and approximation. In this paper, we incompletely introduce the main achievements in this area obtained by our group and relative researchers during recent 5 years （2001-2005）. The main topics are： convergence of Cesaro summability, a.e. and strong summability of Fourier-Laplace series; smoothness and K-functionals; Kolmogorov and linear widths.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

Boundedness for commutators of multipliers on Hardy type spaces

In this paper, we study the commutators generalized by multipliers and a BMO function. Under some assumptions, we establish its boundedness properties from certain atomic Hardy space Hb^p（R^n） into the Lebesgue space L^p with p 〈 1.     

A unified approach to certain problems of best local approximation

In this paper we study best local quasi-rational approximation and best local approximation from finite dimensional subspaces of vectorial functions of several variables. Our approach extends and unifies several problems concerning best local multi-point approximation in different norms.     

THE 8~(th) INTERNATIONAL CONGRESS ON INDUSTRIAL AND APPLIED MATHEMATICS

<正>August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists     

Towards Excellence in Science Chinese Academy of Sciences

<正>May 26,2014,Beijing Science is a human enterprise in the pursuit of knowledge.The scientific revolution that occurred in the 17th Century initiated the advances of modern science.The scientific knowledge system created by