基于战时物资应急调度的库存控制方法

战时军用物资需求的不可预测性极大地影响了物资订货判断决策。为了更有效地对战时物资应急调度的物资库存进行管理．在对平时和应急调度时的物资不同的需求特性分析基础上,提出了一种新的动态订货法,该方法旨在根据物资不同时期的需求变化动态地确定再订货点和订货批量,以实现对库存更高效的控制,并通过仿真表明采用这种新的库存管理方法可以有效地提高保障效率和降低库存成本,为应急调度行动提供了有力的保障。     

A Note on Minimax Mixture of Distributions Free Procedure for Inventory Model with Variable Lead Time

In recent papers, Moon and Choi (1998) and Hariga and Ben-Daya (1999)considered a continuous review inventory model with a mixture of backordersand lost sales in which the lead time, the order quantity, and the reorder pointare decision variables was studied. Moreover, they also develop a minimaxdistribution free procedure for the problem. While the demands of differentcustomers are not identical in the lead time, then we can't only use a singledistribution (such as Moon & Choi (1998) and Hariga & Ben-Daya (1999))to describe the demand of the lead time. Hence, we correct and extend the modelof Moon and Choi (1998) and Hariga and Ben-Daya (1999) by considering thelead time demand with the mixture of distributions. In addition, we also applythe minimax mixture of distributions free approach to the model by simultaneouslyoptimizing the order quantity, the reorder point, and the lead time to devise a practical procedure which can be used without specific information on demand distribution.     

有确定保质期物品的扩展EOQ模型研究

研究了有确定保质期物品,零售商应如何制定最优订货策略的问题。以经济订货批量（EOQ）模型为基础,构建了有确定保质期物品在保质期内需求不变,保存期内需求线性时变的需求函数,得到在不允许缺货情况下,订货周期在三种情形下的费用函数解析式,通过分析区间内函数的最优性,求得最优订货周期和最优订货量,并得到单位物品变质损失费对总的平均费用毫无作用的结论。最后通过数值算例验证了模型的有效性,并分析了相关参数的灵敏度。     

具有模糊—随机性的易腐货品最优补货策略

结合易腐物品的变质特点,考虑不确定环境下配送中心以固定周期为连锁门店送货、连锁商单位时间需求为模糊变量的分销系统,通过利用三参数Weibull函数来描述易腐货品的变质特性,运用可信性理论的逆模糊化和随机理论,建立了模糊-随机下的每周期易腐货品的最优补货策略模型。借助MATLAB得到了求解最优补货策略的方法,并通过仿真模拟验证了方法的合理性。     

易变质商品供应链合同研究

以一个零售商和一个供应商组成的两级供应链库存系统为研究对象,在模糊需求假设条件下,建立了供应商在零售商已做决策的条件下的最优库存策略.随后研究了供应链集成库存管理模型,并给出模型的求解步骤.最后通过算例说明供应链集成库存管理能有效的减少库存总成本,并分析了变质率对零售商和供应商订货周期以及变质率对各成本的影响.     

Extend (r, Q) Inventory Model Under Lead Time and Ordering Cost Reductions When the Receiving Quantity is Different from the Ordered Quantity

This paper investigates the continuous review inventory model involving variable lead time with partial backorders, where the amount received is uncertain. The options of investing in ordering cost reduction is included, and lead time can be shortened at an extra crashing cost. The objective of this article is to simultaneously optimize the order quantity, reorder point, ordering cost and lead time. We first assume that the lead time demand follows a normal distribution and develop an algorithm to find the optimal solution. Then, we relax the assumption of normality to consider a distribution free case where only the mean and standard deviation of lead time demand are known. We apply the minimax distribution free procedure to solve this problem. For both cases, we also show that the objective cost function to be minimized is jointly convex in the decision variables. Furthermore, two numerical examples are given to illustrate the results.     

定期库存控制模型研究

降低库存成本是企业的第三利润源泉之一,国内外企业对库存管理普遍给予高度的重视。本文对定期库存控制模型进行了一定的探讨和研究,并在此基础上提出了改进的定期库存控制模型。     

Deteriorating inventory model for ready-to-eat food under fuzzy environment

Decreased costs and enhanced customer satisfaction are two main objectives of SCM, and good inventory policy can achieve both simultaneously. Product perishability is a critical aspect of inventory policy. Ready-to-eat food products are very common consumer goods that are, in fact, perishable. The value the RTE food retains is, however, closely dependent on its quality. From the vendor’s point of view, quantifying quality and remaining value should be a critical business issue. In consequence, we combined the traditional deterioration model and quality prediction model to develop a new deteriorating inventory model for RTE food products. This new model quantifies food quality and remaining value. We also improved the new model by fuzzifying storage temperature to simulate temperature fluctuation. The proposed model uses real deterioration rate data. Numerical analysis is conducted in a case study. Overall, the model demonstrates that high storage temperatures reduce profits and force shorter order cycles.     

一类变质性物品的最优生产-库存策略

讨论了需求是时间的连续函数、允许缺货且缺货完全回补、变质率为常数、补货率有限的变质性物品在有限计划期内的生产-库存策略。同时证明了最优生产-库存策略的存在和唯一性,并给出了求最优策略的算法和算例。     

考虑资金时间价值的EOQ模型

现有的经济订货量模型未考虑资金时间价值因素,不符合财务管理的价值观念,也不符合现代管理决策的要求。在传统的经济订货量模型的基础上,引入资金时间价值,建立了考虑资金时间价值因素的各类经济订货量模型,并归纳出各模型之间的转化关系。     

IPO定价机制的随机微分分析

利用具有随机特征投资组合问题的最优投资策略,分析IPO定价机制对投资者的投资决策的影响,进而定性分析新股定价机制存在的问题和缺陷。从投资者投资决策最优化的角度指出我国IPO定价机制改革只有向完全市场化方向改变,才能提高投资者的投资理性,使我国的证券市场不断走向成熟,逐步缩小与发达国家之间的差距。     

基于随机提前期的(Q,s)库存模型

建立了基于随机提前期的（Q,s）库存控制模型,并建立了相应的算法进行优化求解,最后以某汽车公司的有关数据进行了算例分析。     

逆向物流中基于均匀分布的库存控制策略研究

库存管理是逆向物流的重要研究内容。假定销售商允许顾客退货,退回物品可如新以原价卖出,且顾客的需求与退货均服从独立的均匀分布;在此条件下,提出了一个最优订货模型,并进行了求解分析。研究结果表明,退货率对销售商的订货数量和期望收益都有影响,销售商应采取有效的措施尽量降低退货率。     

Interval Estimation for the Two-Parameter Exponential Distribution Based on the Doubly Type II Censored Sample

The interval estimation of the scale parameter and the joint confidence region of the parameters of two-parameter exponential distribution under doubly Type II censoring is proposed. In addition, the simulation study for the performance of our methods is done in this paper. One biometrical example is also given to illustrate the proposed methods.     

The average number of events per time unit and its estimation

Let ζ _t be the number of events which will be observed in the time interval [0;t] and define as the average number of events per time unit if this limit exists. In the case of i.i.d. waiting-times between the events,E[ζ _t ] is the renewal function and it follows from well-known results of renewal theory thatA exists and is equal to 1/τ, if τ>0 is the expectation of the waiting-times. This holds true also when τ = ∞.A may be estimate by ζ _t /t or where is the mean of the firstn waiting-timesX ₁,X ₂, ...,X _n . Both estimators converage with probability 1 to 1/τ if theX _i are i.i.d.; but the expectation of may be infinite for alln and also if it is finite, is in general a positively biased estimator ofA. For a stationary renewal process, ζ _t /t is unbiased for eacht; if theX _i are i.i.d. with densityf(x), then ζ _t /t has this property only iff(x) is of the exponential type and only for this type the numbers of events in consecutive time intervals [0,t], [t, 2t], ... are i.i.d. random variables for arbitraryt > 0.     

一种随机变化下的库存模型

主要讨论了在生产需求随机量和时间随机量变化的情况下，如何动态决定(Q，r)库存管理模型，并给出了具体的数学模型及需求变量概率密度函数的确定。     

零售业库存分布模型及分区配送算法研究

根据目前零售业的实际,提出一个配送中心多个零售点的库存分布模型,并采用逐步迭代逼近的方法,求出系统最佳订货量。与此同时,提出了一种改进分区配送算法。     

On the independence of integer and fractional parts

We use the independence of the integer and fractional parts of exponentially distributed random variables to obtain expressions for the order statistics from a geometric distribution. As our main result we show that a strong form of this independence characterizes the exponential distribution.     

系统动力学在超市配送中心库存策略中的应用

本文提出了将系统动力学用于确定超市配送中心订货量与库存量的有效方法，根据系统动力学建模的基本原理．建立超市配送中心库存系统动力学模型，对该模型进行运行及结果分析。     

分销系统库存控制策略研究

针对供应链的下游,即由分销商和零售商组成的系统,建立了分销系统协同策略模型;讨论了如何运用系统的观点,通过赊账销售、订货补贴及收取特权费的方法来实现分销商和零售商的协同。