互联网专柜代购下实体店商品订货策略研究

近年来,"专柜代购"成为网购的一个热门词汇,这种模式价格比商场便宜,使实体经营店的销售受到很大冲击.考虑互联网快速发展下专柜代购对实体店商品经营的影响,建立了相应的经济订货批量模型,分析了优化模型唯一最优解存在的条件和相关的管理启示,采用数值仿真分析了互联网专柜代购影响因子、短缺量滞后供给分数等参数对实体销售商订货策略和平均利润的影响.     

不同支付方式下的多模式项目支付进度问题研究

本文首先明确了研究的假设条件并对多模式项目支付进度问题（MPPSP）进行了界定;随后从承包商和业主两个角度构建了MPPSP的基本优化模型;鉴于支付方式的不同,将基本优化模型扩展为基于进展、基于时间和基于费用的MPPSP优化模型;最后,通过对一个算例的计算分析,讨论了支付方式对最优支付进度安排及合同双方收益的影响.     

Service Level and Average Stockholding in a Re-Order Level System

Recently published mathematical expressions for measures of performance in a stock replenishment system are examined. The representation of service level is different from others in the literature. The difference in average stock is shown to be negligible in most practical cases.     

基于因子分析的粮食收购政策执行效果评价

依据现有研究,通过归纳分析影响粮食收购政策执行效果的因素,构建评价其执行效果的模型.确定衡量粮食收购政策执行效果的指标因子,运用因子分析技术,对政策的执行效果进行分析,进而得到因子综合得分并用于对粮食收购政策执行效果进行评价.运用本文的因子综合得分法对部分示例省份粮食收购政策的执行效果进行评价和分析,在此基础上进一步提出完善建议.     

钢管订购和运输策略

在铺设管道为一条线的情况下 ,我们建立了解决钢管订购和运输问题的非线性规划模型 .由于变量较少 ,约束条件大都为线性的 ,目标函数为二次函数 ,所以利用 Lingo软件 ,可以很快求得比较满意的订购和运输方案 .我们利用 Matlab软件 ,对所得到的数据进行拟合 ,得到相应的反映销价变化对总费用影响的曲线 ,然后比较各个钢厂钢管销价变化对总费用影响的大小 .对于钢厂钢管产量上限变化对总费用和购运计划的影响 ,我们也作了类似的处理 .如果要铺设的管道是树形图 ,我们对树形图的每条边定向 ,建立了与铺设管道为一条线时类似的数学模型 ,从而大大拓广了模型的使用范围 .在论文中 ,我们还对所建立的模型的优缺点和需要改进的方向进行了讨论     

基于一致性排序的动态评价方法研究

主要工作是通过Copealand重排序方法构建动态评价模型,研究动态评价中的一致性排序问题,并通过实证研究验证模型的有效性.首先,利用基尼系数赋权法建立评价模型,确定静态评价结果和排名;然后,通过Copealand法确定出一个综合不同年份排序的一致性排序;最后,根据评价对象不同年份排名的发展趋势对一致性排序进行修正,得到最终的排序.主要特色一是通过Copealand法集合不同年份的排序确定最终的一致性排序,避免了通过引入时间权向量确定动态权重时人为主观因素太强的问题,解决了动态综合评价中的一致性排序问题;二是通过对一致性排序的修正,保证了最终的排序能够体现不同年份的发展趋势.     

一个组面试问题的最佳顺序安排

采用边界阶段方法讨论最优组面试问题的最佳划分选择策略,在允许调整面试顺序的情况下,得到最优组面试问题中如何重新安排面试顺序能够以最大概率录用到最优应聘者的排序策略.     

The Boson Normal Ordering Problem and Generalized Bell Numbers

For any function F(x) having a Taylor expansion we solve the boson normal ordering problem for $F [(a^\dag)^r a^s]$, with r, s positive integers, $F [(a, a^\dag]=1$, i.e., we provide exact and explicit expressions for its normal form $\mathcal{N} \{F [(a^\dag)^r a^s]\} = F [(a^\dag)^r a^s]$, where in $ \mathcal{N} (F) $ all a's are to the right. The solution involves integer sequences of numbers which, for $ r, s \geq 1 $, are generalizations of the conventional Bell and Stirling numbers whose values they assume for $ r=s=1 $. A complete theory of such generalized combinatorial numbers is given including closed-form expressions (extended Dobinski-type formulas), recursion relations and generating functions. These last are special expectation values in boson coherent states.AMS Subject Classification: 81R05, 81R15, 81R30, 47N50.     

保险赔付中的最优对冲策略

本文对带有付费过程$A_t$的保险公司在金融市场$(S_t,Q_t,B_t)$上通过购买股票$S_t$、兑换外币$Q_t$以及购买无风险资产$B_t$的投资过程而采取的最优投资策略, 使保险公司所面临的风险最小进行探讨. 利用Galtchouk-Kunita-Watanabe分解定理将风险表达式重新表达, 从而找到保险公司所能采取的风险最小的最优对冲策略. 文中举出一个具有现实性意义的例子将文章的重要结论加以应用, 使本文更具有应用价值.     

我国大额实时支付系统支付流统计特征分析

本文基于我国大额支付系统支付流自2005年7月到2008年7月的数据进行统计特征的研究。通过对中央银行历次准备金率调整对支付流影响的研究,发现在大多数调整时段内准备金率的调整会引起支付流数值的均值与波动的增加,右尾厚尾指数降低。而支付流是相关序列的数据检验结果是我国可以借鉴国外经典风险管理模型对支付流进行风险管理的依据。     

偷逃税监管中的马氏链分析方法

本文利用马尔柯夫链分析方法,对税收监管工作中纳税人因偷逃税款而受到罚款惩处时罚款数额的确定问题进行了统计分析,它为实际管理工作中遇到的类似决策问题提供了科学的数量基础。     

基于购买力平价的我国城市薪酬差异系数研究

我国经济的快速发展造成了地区间的差异不断加大,对劳动力的流动也造成了深远的影响.城市薪酬差异系数代表了城市的整体薪酬水平,了解城市的生活成本差异、了解实际工资水平,宏观上有利于了解劳动力流动趋势,微观上有利于企业制定更接近当地实际情况的薪酬策略,因此基于购买力平价通过构建一篮子物品和服务来衡量我国大中城市的生活消费成本,进而得到城市薪酬差异系数,帮助企业准确的、直观的了解中国各地的薪酬水平及差异,了解生活成本对劳动力流动的影响,为全国性企业在各地区的薪酬策略提供依据.     

Ordering groups and validity in lattice-ordered groups

An inductive characterization is given of the subsets of a group that extend to the positive cone of a right order on the group. This characterization is used to relate validity of equations in lattice-ordered groups (?-groups) to subsets of free groups that extend to the positive cone of a right order. As a consequence, new proofs are obtained of the decidability of the word problem for free ?-groups and generation of the variety of ?-groups by the ?-group of automorphisms of the real line. An inductive characterization is also given of the subsets of a group that extend to the positive cone of an order on the group. In this case, the characterization is used to relate validity of equations in varieties of representable ?-groups to subsets of relatively free groups that extend to the positive cone of an order.     

Ordering of risks and ruin probabilities

Upper and lower bounds for the ruin probability over infinite time in the classical actuarial risk model are derived (usual independence and equidistribution assumptions, the claim number process being Poisson). Some recent results on bounds for certain classes of integrals are adapted to the case of a convolution transform in order to derive applicable (from the actuarial point of view) bounds.     

Generalization of Ordering Principles and Applications

In this paper, we prove some new ordering principles which generalize the well-known Brézis–Browder principle and uniformly generalize some results in the literature. As an application, we prove some vector Ekeland-type variational principles in F-type topological spaces and some new Mönch-type fixed-point theorems for discontinuous multivalued operators in F-type topological spaces and Banach spaces with weak topology.     

双圈图按谱半径的排序

一个n阶简单连通图G被称为双圈图,如果它的边数是n+1.记B(n)是n阶双圈图的全体.本文确定了B(n)(n≥20)中谱半径的第六大至第十大值和对应的图.     

Measure of Ordering in Statistical Systems

In this paper, we introduce a phenomenological measure of ordering in statistical systems. Using this characteristic, we construct a formal model of a system evolving according to the law of steepest ascent as the control parameter increases.     

The Partial Ordering on the Automorphism Group of the Countable Generic Partial Order

The countable generic poset (P,?≤?) is the Fraïssé limit of the amalgamation class of finite partially ordered sets (see Glass et al., Math Z 214:55–66, 1993; Schmerl, Algebra Univers 9:317–321, 1979). It is homogeneous and \(\aleph_0\)-categorical with quantifier elimination. This paper concerns the structure (G,?°?,?≤?), where \((G,\circ)=\textrm{Aut}(P,\leq)\) and ≤ is the pointwise ordering on G. This is a natural structure to look at, because the ordering on G is ?-definable up to reversal in the language {?°?} (but this fact is not proved here). In this paper I show that (G,?≤?) is elementarily equivalent to (P,?≤?) itself. More generally, (G,?°?,?≤?) satisfies a weakening of the existential closure property for partially ordered groups. (Existential closure in groups has been studied for example in Higman and Scott.) This requires one to study the group G ^???, obtained by freely adjoining a finite set of generators to G.