超市网点设计的非线性模型

利用观众对商业区购买力的影响因子,解决了确定各商区购买力水平的问题.在此基础上,综合考虑各方面因素,建立了关于临时超市网点规模设计的非线性规划模型,并利用MATLAB求得结果.     

奥运会临时超市网点设计的蒙特卡罗模型

建立了蒙特卡罗模型,得到商区网点设计的方案和不同规模的迷你超市的个数.     

2006年浙江省台州市中考数学试卷

一、选择题(有12小题,每小题4分,共48分)第2题图1.下列各数中是正整数的是()A.-2B.1C.0.3D.22.如图,长方体的面有()A.4个B.5个C.6个D.7个3.下列计算正确的是()A.3x-2x=1B.3x 2x=5x2C.3x·2x=6xD.3x-2x=x4.直径所对的圆周角是()A.锐角B.直角C.钝角D.无法确定第5题图5.如图,圆锥的母线长为5cm,底面半径为3cm,则此圆锥的高线长为()A.4cm B.5cmC.3cm D.8cm6.方程x2-4x 3=0的两根之积为()A.4B.-4C.3D.-37.要使根式x-3有意义,则字母x的取值范围是()A.x≥3B.x>3C.x≤3D.x≠38.若反比例函数y=xk的图象经过(-2,1),则k的值为()A.-2B.2C.-…     

2006年重庆市初中学业考试数学试卷

一、选择题:1.3的倒数是()A.-3B.3C.31D.-312.计算2x2·(-3x3)的结果是()A.-6x5B.6x5C.-2x6D.2x63.⊙O的半径为4,圆心O到直线l的距离为3,则直线l与⊙O的位置关系是()A.相交B.相切C.相离D.无法确定4.使分式2xx-4有意义的x的取值范围是()A.x=2B.x≠2C.x=-2D.x≠-25.不等式组xx--23><00的解集是()6.A如.图x,>⊙2O的B.直x径<3CDC过.弦2相似文献   

条件免运费的B2C平台商最优凑单推荐服务水平策略

在条件免运费(CFS)下,针对消费者基础运费和凑单异质性购物偏好,选择合理的购物凑单推荐服务水平策略是提升B2C平台商业绩的关键。在对平台商与消费者间的主从博弈关系、消费者效用函数关系分析基础上,通过构建Stackelberg博弈模型,揭示平台商凑单推荐服务水平和消费者购物意愿间的互相关系,进而针对消费者基础运费和凑单偏好,探究基础运费、保留价格和推荐商品价格对平台商最优购物推荐服务水平策略的影响。研究表明:不同的基础运费和消费者偏好对平台商利润的影响具有差异性;适度提升最优购物凑单推荐服务水平能有效提高消费者购物意愿、增加平台商利润。因此,基础运费、CFS阈值和凑单推荐服务水平的科学制定对平台商业绩改善具有重要影响。     

运油率问题

1 .问题设A、B两地的路程为S .A地产汽油 ,B地的汽油需从A地运入 .汽车从A地直接运汽油往B地 ,往返的油耗量正好等于满载一车汽油的吨数 ,因此 ,无法将A地汽油直接运到B地 .为了解决这个问题 ,需要在A、B途中设一油库中转站C ,先由往返于A、C间的汽车将油运至C地 ;再由往返于C、B间的汽车将油运至B地 .( 1)将运油率P表示为A、C两地间路程的函数 (运油率P =B地收到的汽油量 /A地运出的汽油量 ) ;( 2 )C站设在何处时 ,运油率最大 ?最大运油率是多少 ?2 .分析与解上面问题 ,是一道近年来高考数学模拟试卷中出现频数较高的应用题 .笔…     

过圆锥顶点的最大截面选择题

圆锥的母线长为5,按以下条件求过顶点的截面的最大面积. 1.底半径为3时 (A)12;B)10;(C)8;(D)6. 2.底半径为4时'A)25亿丁,'B,誓;(C)25,(D,6.".底半径为号"忿时(A)12多(B)4。底半径为2时丝.4了(C)附:本期"一望而解"揭底:     

选择题三道

以下三道四里挑一的选择题,都要求口答。 1、数N=Zx3x5K7xll的正约数有 (A)5个,(B)6个,(C)32个;(D)64个.2、复数(溉今‘’“的模为(A)0,(B)1,(C)侧亏,(D)5”’‘. 3、△ABC中,若:n“A十:n ZB十sfn“C>2,则此三角形为 (A)锐角三角形,(B)直角三角形, (C)钝角三角形;(D)不能确定.     

正三角形的19组充要条件

判断三角形的形状是一类重要的问题 ,通常使用三角变换 (含正弦、余弦定理 )求解 ,也可用向量形式给出 .本文给出△ABC为正三角形的一组充要条件 ,供学习参考 ,也可从中充分体会数学的对称美 .条件 1　a =b =c .条件 2　A =B =C .条件 1 ,条件 2是正三角形的定义 ,是判断正三角形的最基本的依据 .条件 3　cos(A -B)cos(B -C)cos(C -A) =1 .条件 3由余弦函数的有界性立得 .条件 4　 2b =a +c,b2 =ac.条件 5　 2B =A +C .B2 =AC .条件 4与条件 5由既等差又等比的数列是常数列立得 .条件 6　 2B =A +C ,2b =a +c.条件 7　 2B =A +C ,…     

初二几何第一学期期中自测题

A组一、填空题(每小题4分,共40分)1.三角形的三个内角中,最多有个锐角,最少有个锐角,最多有个直角,最多有个钝角.2.在△ABC中,∠A∶∠B∶∠C=2∶3∶4,则∠A=,∠B=,∠C=.3.在△ABC中,∠A=12∠B=14∠C,则三个内角分别是.4.已知三角形两边分别是2厘米和7厘米,第三边的数值是偶数,则这个三角形的周长是.5.已知不等边三角形的最长边为9,最短边为2,且第三边是整数,则第三边长.6.如果在一个三角形中,最大角是最小角的2倍,那么最小角的范围是.7.周长为15,各边长是互不相等的整数的三角形有个.8.在△ABC中,∠B和∠C的平分线交于点O,若∠A=5…     

奥运会临时超市网点的优化设计

在对[1]提供的问卷调查数据进行处理的基础上,运用商圈理论,就2008北京奥运会比赛主场馆周边地区临时超市网点(MS)的设计问题,在满足购物需求、分布基本均衡和商业上赢利三大基本要求上,建立起整数线性规划数学模型,并得到较为理想的优化设计结果.     

The Joint Determination of Price, Quality, and Capacity: An Application to Supermarket Operations

This paper focuses on a service provider who, faced with competition, must determine the optimal price and level of service quality to provide in order to maximize profits. Service quality and price are assumed to impact jointly on demand for services. Both demand and service quality impact on the cost of providing service. While a considerable literature exists on the impact of service quality on demand or cost, less work has focused on the explicit impact of service quality jointly on both demand for and the cost of providing services. A service quality constraint is appended to the formulation in order to guarantee that a declared service standard is met. Conditions are developed which characterize optimal solutions, together with comparative statics. Illustrative results are presented based on empirical data obtained from a supermarket study.     

基于灰色理论的人口年龄结构对房地产需求影响分析

通过研究影响房地产市场需求的主要因素,特别引入不同年龄段人口数这一因素,建立了基于灰色理论的房地产市场需求影响因素分析模型,对影响全国房地产市场需求的各因素进行实证分析,从而得出人口年龄结构在影响房地产市场需求中的重要性.并进一步分析人口年龄结构对需求的影响机理.     

Spatial price equilibrium,distribution center location and successive over-relaxation

A spatial price equilibrium problem is modeled which allows piecewise linear convex flow costs, and a capacity limit on the trade flow between each supply/demand pair of regions. Alternatively, the model determines the locations of intermediate distribution centers in a market economy composed of separate regions, each with approximately linear supply and demand functions. Equilibrium prices, regional supply and demand quantities, and commodity flows are determined endogenously. The model has a quadratic programming formulation which is then reduced by exploiting the structure. The reduced model is particularly well suited to solution using successive over-relaxation.     

线上商品与多种快递服务的组合优化研究

针对网上销售的商品所捆绑的快递服务无法满足顾客多样化需求,而快递服务商又失去了市场空间的问题,提出一种“线上商品+多种快递服务”的组合销售模式,以扩大电商的市场规模,提高快递服务商的利润和差异化竞争水平。在市场细分和顾客需求调查的基础上,综合考虑电商、快递服务商、网购顾客三方的利益,以快递服务商收益最大为目标,构建基于顾客选择行为的“线上商品+多种快递服务”组合销售模式优化模型。以SP调查为数据基础,优化线上商品与多种快递服务的组合销售模式及确定各组合销售模式的均衡价格。模型的求解结果准确地揭示了顾客在网上购物时的快递服务选择行为、快递服务商的末端利润与组合模式之间的关系。     

超市配送中心库存策略SD模型研究与分析

超市配送中心库存策略的确定是实现零售商零库存的一种重要方法.运用系统动力学方法分析了配送中心与超市库存系统,结合系统动力学建模工具VEN S IM软件的使用,建立了配送中心与超市库存系统动力学模型,对该模型进行了运行及结果分析.     

Conditions that cause risk pooling to increase inventory

We say product A is a partial substitute for product B if a fraction of the customers who prefer B are willing to accept A when B is out of stock. When demand is uncertain, it is intuitive and true that a larger “willing to substitute” fraction implies larger expected profits. A higher “willing to substitute” fraction allows one to pool the risk of individual products. It may also be intuitive that a larger “willing to substitute” fraction might result in lower optimal total inventory. For the full substitution structure, several researchers have shown that for certain distributions such as the exponential, this latter intuition is not true. We show that this full substitution anomaly can occur with any right skewed demand distribution. We assume i.i.d. demand distributions unless we indicate otherwise. We also show that the anomaly can occur for a number of realistic situations of partial substitution with commonly used demand distributions such as Normal, exponential, Poisson, and uniform. We also demonstrate the anomaly for more than one period, with backlogging, lost sales, more than two products, and with setup costs.     

Renormalization group method and Julia sets

The renormalization group (RG) method has been used successfully in treating a variety of phase change and critical-point problems (Wilson KG, Kogut J. Phys Rev C 1974;12:75; Wilson KG. Rev Mod Phys 1975;773; Wilson KG. Phys Rev B 1971;3174). A relatively simple system is considered at the smallest scale; the problem is then renormalized in order to utilize the same system at next larger scale. The process is repeated at larger and larger scales. In the following we consider a model for the flow of a fluid through a porous-medium. The RG transformations for the flow of a fluid through a porous-medium in two and three dimensions are derived and generalized to the complex plane, and the types of the corresponding Julia sets are found and generated. Also, the RG transformation for Ising model on a square lattice is derived and the corresponding Julia set is found.     

Dynamic inventory system with pricing adjustment for price-comparison shoppers

With numerous price-comparison websites and applications, consumers today are frequently conducting price-comparison shopping. As a result, retailers face an increasing challenge in predicting consumer demand and determining the optimal product price and inventory level accordingly. To address this issue, this paper proposes an inventory model with joint decisions of price and inventory to optimize the retailer's long-run average profit under price-comparison consumer shopping. We first formulate the demand arrival process for a retailer under price-comparison shopping to be affected by not only its own price but also its competitors'. Based on this demand arrival process, we then formulate the retailer's long-run average profit and derive properties of its optimal solution. Our model focuses on capturing the impact of price-comparison consumers on a retailer's optimal price and inventory decisions. In particular, we allow competitors' prices to affect the retailer's demand via two key factors: the manufacturer's suggested price and the variability of the outside lowest price. According to our results, when the suggested price increases, the retailer should lower its price to obtain more price-comparison customers from competitors, whereas when the variability of outside lowest price increases, the retailer should raise its price to increase per unit profit from nonprice-comparison customers.     

On Cost Allocation in Hub-Like Networks

We consider telecommunication network design in which each pair of nodes can communicate via a direct link and the communication flow can be delivered through any path in the network. The cost of flow through each link is discounted if and only if the amount of flow exceeds a certain threshold. This exploitation of economies of scale encourages the concentration of flows and use of relatively small number of links. We will call such networks hub-like networks. The cost of services delivered through a hub-like network is distributed among its users who may be individuals or organizations with possibly conflicting interests. The cooperation of these users is essential for the exploitation of economies of scale. Consequently, there is a need to find a fair distribution of the cost of providing the service among users of such network. In order to describe this cost allocation problem we formulate the associated cooperative game, to be referred to as the hub-like game. Special attention is paid to users' contribution to economies of scale. We then demonstrate that certain cost allocation solutions (the core and the nucleolus of the hub-like game), which provide users with the incentive to cooperate, can be efficiently characterized.