基于GRA和熵权以及Fuzzy-AHP组合模型的石油出口影响因素的分析——以拉美石油国家为例

选取经济、社会、石油资源、能源消费相关因素历史数据与拉美石油出口数据建立灰色关联度分析,取灰色关联度大于0.9且相对稳定的影响因素,分别基于熵和基于模糊层次分析进行综合评价.结果认为选取的影响因素对阿根廷和委内瑞拉,适用性良好;对厄瓜多尔,适用性较好.不同国家主要影响因素不同:对阿根廷,影响因素以资源类为主,尤其是人均能源消费对阿根廷石油出口具有高关联度;对厄瓜多尔,影响因素以经济类为主;对委内瑞拉,选取的因素与石油出口关联度均较高且分布均匀.     

基于神经网络算法的海南旅游需求测估模型

在详细调查海南旅游相关数据的前提下,先建立模型对海南旅游需求进行了预测,然后分析了影响旅游需求的主要因素.先用GM(1,1)灰色模型对海南省旅游人数进行预测,并用马尔科夫链修正误差,在灰色模型的基础上进行了优化.进一步,我们将灰色模型与BP神经网络模型结合起来进行预测,并针对BP网络输入层提供了2种方法:三年滚动预测、多因素预测.得出结论:海南旅游人数还将会逐年递增.同时,通过比较相对误差发现,对于问题的预测精度:BP神经网络灰色模型.最后,我们利用灰色关联度模型得出各因素对旅游需求的影响:服务交通景观发展消费环境.     

基于优化的灰色马尔可夫内蒙古电力需求预测模型

针对电力需求随机性和波动性的特点,建立优化的灰色马尔可夫预测模型.利用该模型,对内蒙古自治区2006-2015年的电力消费数据,进行数值模拟.使用三种检验方法:残差、关联度和后验差对结果进行检验.实验结果表明:平均相对残差达到1.0%,关联度满意,后验差预测等级为好.在此基础上,对内蒙古未来五年的电力需求进行预测,并提出建议与对策,对内蒙古制定可行的电力发展规划方案具有参考价值.     

居民食品消费价格指数递进时段灰色关联度分析研究

指出对居民食品消费价格指数进行递进时段灰色关联度分析研究的重要性.指出递时段灰色关联度分析的方法:设立子、母数据列,进行标准化处理,计算灰色关联系数,确定权重,计算灰色关联度且排序.以2002-2013年居民食品消费价格指数及8个分指标指数为研究数据,以6年为时长,进行计算分析,得出"水产品""在外用餐食品""粮食"对居民食品消费价格指数的关联度分别占前三位的结论.     

国债发行规模影响因素的灰色关联度分析

本文引进了一种新的多因素分析法──灰色关联度分析，对影响国债发行规模的影响因素进行分析，并将灰色关联度分析与传统分析方法──相关和回归分析──进行了比较，并由此得出几点启示．     

天然气需求影响因素分析及未来需求预测

不同的影响因素对天然气需求的影响程度存在差异,为充分认识上述差异,利用相对关联度定量刻画天然气需求量与影响因素之间的关联程度。依据重要性优先原则,采用逐步回归法逐次地对影响因素的统计显著性进行检验,深度挖掘有效驱动因素,构建“最佳”逐步回归C-D生产函数模型预测未来天然气需求走势。结果表明:(1)GDP是影响中国天然气需求的最主要因素,能源消费结构也是重要的有效驱动因素之一;(2)基于重要有效驱动因素构建的“最佳”逐步回归C-D生产函数模型实现了历史数据拐点拟合预测,具有良好的预测性能,预测结果可作为确定未来天然气需求的重要参考依据;(3)预测2020~2030年中国天然气需求量呈稳步增长趋势,但增速有所减缓,到2030年天然气需求量达约5660亿立方米,天然气需求量增长率降至4%。     

福建省碳排放影响因素分析及情景预测

基于福建省经济增长、能源消耗及环境污染现状的基础上,采用联合国政府间气候变化专门委员会规定的碳排放计算方法,测算福建省2003-2015年的能源消费碳排放量.运用灰色关联分析法研究经济增长水平、产业结构、能源结构、能源强度、城市化率和贸易密度与碳排放量的关联度,分析各因素对福建省碳排放量的影响.同时探讨在四种经济增长情况下,福建省2015-2020年人均碳排放量变化趋势.结果显示GDP增速越快,人均碳排放量增长也越快,而当GDP增速维持在9%时,福建省的人均碳排放量可以实现逐年下降的趋势.     

基于修正邓氏灰色关联度的设备费用影响因素分析

针对武器装备数据多为小样本情况,采用灰色关联度对其研制生产费用影响因素的确定,针对灰色关联度不能处理负相关和组合相关的问题,提出应用普通相关和逐步回归对灰色关联度结果进行修正,实例分析表明处理结果更符合实际情况.     

我国研究生教育规模影响因素分析及预测

灰色关联度方法对我国研究生教育规模相关影响因素的定量分析结果表明,高等教育规模、科技教育投入和经济发展水平因素与我国研究生教育规模存在显著的影响关系,而就业状况和人口总规模并未对我国研究生教育规模变化产生显著影响. GM(1,1)模型对未来研究生在学人数和每千人在学研究生数的预测结果显示,在保持现状的情况下,研究生教育规模在未来一定时期内仍将低速稳定增长.实证研究结论给我们以一些重要启示.     

西藏旅游收入乘数模型及主要因素的关联分析

利用《西藏统计年鉴》的有关数据,根据乘数理论建立乘数模型,对西藏旅游收入乘数值、GDP对旅游业的依存度等进行计算,研究分析旅游业对西藏经济的重要影响.运用灰色系统理论的灰色关联分析方法,对影响西藏旅游收入的主要因素进行关联分析,确定各因素与旅游收入的关联度,对关联度进行分析,并根据关联度的大小提出相关建议.     

Qualitative Analysis of Bifurcating Solutions in the Lengyel-Epstein Model

One of the most fundamental problems in theoretical biology is to explain the mechanisms by which patterns and forms are created in the＇living world. In his seminal paper ＂The Chemical Basis of Morphogenesis＂, Turing showed that a system of coupled reaction-diffusion equations can be used to describe patterns and forms in biological systems. However, the first experimental evidence to the Turing patterns was observed by De Kepper and her associates（1990） on the CIMA reaction in an open unstirred reactor, almost 40 years after Turing＇s prediction. Lengyel and Epstein characterized this famous experiment using a system of reaction-diffusion equations. The Lengyel-Epstein model is in the form as follows     

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.     

(0,1 ;0)-INTERPOLATION ON INFINITE INTERVAL (-∞, +∞)

In this paper, we study the explicit representation and convergence of (0, 1; 0)-interpolation on infinite interval, which means to determine a polynomial of degree ≤ 3n - 2 when the function values are prescribed at two set of points namely the zeros of Hn(x) and H′n(x) and the first derivatives at the zeros of H′n(x).     

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.     

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.     

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.     

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.     

Journal of the Operations Research Society of China Special issue on Operations Research in Healthcare Management

正Guest Editors:Hong Chen,Shanghai Jiao Tong University,Shanghai,China Guohua Wan,Shanghai Jiao Tong University,Shanghai,China David Yao,Columbia University,New York,USA Scope:Healthcare delivery worldwide has been fraught with high cost,low efficiency and poor quality of patient care service.For the field of operations research(OR),healthcare offers some of the biggest challenges as well as best opportunities in