考虑产品变质的VMI混合补货发货策略及优化仿真

本文研究了“产品可变质”情况下的VMI库存补货与装运调度问题,并建立了Poisson需求过程下的VMI混合补货发货模型,根据此模型通过简单的规划求解即可得到使长期平均成本最小的最佳混合策略组合。由于模型推演过程中涉及到对补货周期内期望发货次数的近似估计,因而模型解是拟最优的。算例和模型仿真显示,模型结果与仿真结果十分相近,从而模型有效性得以确认。     

A公司丙烯腈库存实施VMI管理模式研究

供应商管理库存在电子制造、汽车等离散型行业已经有了广泛的应用,但在化工等流程型行业研究和应用较少。本文以某腈纶制造A公司为研究对象,对该公司实施VMI进行了比较深入的探讨,对流程型行业实施VMI有一定的现实意义。     

一般纳税人非货币性交换涉及存货处理问题探讨

企业取得的其他资产(如固定资产)所支付的进项税额构成资产的实际成本,即均为含增值税的成本。在涉及存货的非货币性交易中一定要注意存货的账面价值是不合税的,存货的公允价值是否含税应弄清楚。探讨在非货币性交换中涉及存货时补价的会计确认及账务处理问题。     

库存管理问题研究

随着世界经济的快速发展,物流作为“第三利润源”在各产业中发挥着举足轻重的作用,而物流中库存管理水平更是反映一个企业管理水平的关键指标.本文通过分析库存管理的含义和库存管理中的问题,指出库存管理不再是传统的仓库管理,而是基于整个供应链的全局把握,链条上的任何一环出现问题,都足以造成库存超出合理的水平,所以清晰地把握库存管理的概念有助于从供应链的角度分析问题,达到提升企业运营管理水平的目的.     

我国大中城市物流产业的发展构建与规划问题研究

随着经济全球化和商业活动广域化的迅速发展以及社会分工的不断深化,现代物流业受到世界各国的普遍重视,其发展水平不但体现了一个国家的综合国力,也反映了一个国家流通效率的高低、资源配置的优劣、城市和制造业的发展水平.随着现代物流在全世界的快速发展,城市物流在区域经济发展中的重要作用日益明显;特别在当前城市化进程加快的背景下,许多城市都提出了要把物流产业作为一个经济增长点.针对我国大中城市物流发展中存在的问题,提出构建现代科学、高效的城市物流规划系统的几大对策.     

Inventory placement problems in dynamic supply chains

Summary  In this paper a basic model for analyzing the inventory placement problem in a supply chain is developed. The problem will be studied for a capacitated, multi-stage supply chain facing a continuous, stochastic demand for a single period for a single product — a specialty item with a very short selling season. The objective is to maximize the probability of achieving a set profit level. We prove that finding an optimal stock investment at the stages entails solving a mixed binary integer linear program. We characterize properties of the stock investment, examine two interesting cases where the stock investments have a simple structure, and develop a branch and bound approach for solving the more general case.

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Zusammenfassung  In diesem Beitrag wird ein Grundmodell entwickelt, um das Problem der Lagerplatzierung in einer Lieferkette analysieren zu k?nnen. Das Problem wird für eine kapazitierte mehrstufige Lieferkette untersucht, wobei unterstellt wird, dass es um die Nachfrage nach einem einzigen Produkt für eine einzige Periode (einen Sonderartikel mit sehr kurzer Verkaufszeit) geht und diese Nachfrage stetig und stochastisch ist. Unter diesen Bedingungen soll die Wahrscheinlichkeit maximiert werden, ein vorgegebenes Gewinnniveau zu erreichen. Die Suche nach der optimalen Vorratsinvestition auf den Stufen der Lieferkette führt zur Formulierung eines gemischten ganzzahligen linearen Programmierungsproblems mit Bin?rvariablen. Die Eigenschaften der Bevorratungsinvestition werden charakterisiert, zwei interessante F?lle mit einer einfachen Struktur der Bevorratungsinvestition untersucht und ein Branch-and-Bound-Ansatz zur L?sung eines allgemeineren Problemfalls entwickelt.

     

定期信用支付条件下的多阶段货价变动型存贮问题

本文研究了定期信用支付条件下的多阶段货价变动型存贮问题,得到了最优订购策略并设计了算法以说明模型的使用。     

图书馆清产核资以后的思考

通过清产核资,暴露出对馆藏文献资源的管理、开发与利用存在着不足.在分析原因的基础上,提出几点建议.     

Optimal Ordering Policies for Inventory Problems With Dynamic Information Delays

Information delays exist when the most recent inventory information available to the Inventory Manager (IM) is dated. In other words, the IM observes only the inventory level that belongs to an earlier period. Such situations are not uncommon, and they arise when it takes a while to process the demand data and pass the results to the IM. We introduce dynamic information delays as a Markov process into the standard multiperiod stochastic inventory problem with backorders. We develop the concept of a reference inventory position. We show that this position along with the magnitude of the latest observed delay and the age of this observation are sufficient statistics for finding the optimal order quantities. Furthermore, we establish that the optimal ordering policy is of state‐dependent base‐stock type with respect to the reference inventory position (or state‐dependent (s, S) type if there is a fixed ordering cost). The optimal base stock and (s, S) levels depend on the magnitude of the latest observed delay and the age of this observation. Finally, we study the sensitivity of the optimal base stock and the optimal cost with respect to the sufficient statistics.     

Economic Evaluation of Systems that Expedite Inventory Information

Information delays exist when the most recent inventory information available to the Inventory Manager (IM) is dated. Such situations arise when it takes a while to process the demand data, count the inventory, and pass the results to the IM. We show that the optimal total inventory‐related cost decreases when the length of the information delay decreases. The amount of the decrease is an important datum for an IM interested in considering whether or not to invest in reducing the delay. The investment is required to finance design and acquisition of an information (collection and dissemination) system that can reduce the information delay. Such systems include phone calls, business meetings, and the use of information collection mechanisms such as radiofrequency identification tags.