MAGAZINE  №2 (97) April 2020


CATEGORY  Optimization and mathematical modelling Inventory management



When managing procurements and suppliers, one often has to deal with heterogeneous information from various sources that is not always amenable to formalization, since it can be defined by qualitative characteristics. Under the sanction pressure on the Russian economy, changes in the market trends for the sale of many goods and services are revolutionary in nature, making it difficult to objectively use mathematical statistics and probability theory for business planning purposes. The increase in the share of sales of innovative products with a short life cycle also limits the use of science-based forecast approaches to the need for supplies. Therefore, issues of improving and standardizing methods of processing and analyzing information reflecting the results of companies’ activities in various business sectors are quite relevant.

The article discusses the specifics of constructing non-linear dependencies of stock consumption on various environmental factors that can be used in calculating insurance stocks. In addition, the article substantiates the possibility of using mutually and autocorrelation functions when planning the need for supplies, as well as methods of multiple correlation and regression analysis. For the procedures for selecting counterparties in procurement, issues of using rank correlation methods are considered. The conclusions made in the article, methodologically, are based on a systematic approach to the analysis of the relationship between the companies’ performance and the influence of macro and microeconomic factors. When processing statistical information, econometric methods and models were used as ways to study quantitative and qualitative economic relationships. The results of the calculations carried out in the article show the effectiveness of the proposed stochastic methods that can be actively used in analyzing consumption trends and planning stocks of raw materials, materials, finished products, operational resources in production, trading and logistics companies.

 Electronic version


Published in Sourcing

MAGAZINE  №6 (95) December 2019


CATEGORY  Information technologies in logistics and SCM Inventory management Simulation modelling



 The article considers the situation when a company needs to distribute limited amount of stock to the regional warehouses in its own two-echelon distribution network. The network consists of a single distribution center and several regional facilities which are serving the company's customers. It is supposed that every warehouse calculates its requirements for the replenishment daily basing on the on-hand inventory, demand forecast, safety stocks and lead-times from the central warehouse. Thus, company's managers are aware of the consumption rate and inventory level at each regional facility. Demand forecasting and final replenishment planning decisions are centralized.
Notion of the "limited stock" refers to such inventory quantity at the central warehouse that is insufficient to satisfy the total volume of all regional warehouses' requirements for the product. Limited stock situation may have varying length in time.
A system of rationing rules or principles should be applied to make a distribution decision in such a situation. These set of rules identify the volume and sequence of the shipments from the central to regional warehouses.
So, in this article authors aim to solve the following problems:
- to identify factors that affect the choice of a certain set of rationing rules for the limited stock;
- to attempt to classify existing rationing principles;
- to identify how the business goals affect the choice of the preferred rationing principle;
- to create an imitation model and check experimentally which rationing principles are the best for each of the business goal
The outcomes gained might be used as a base for the choice of the limited stock rationing principles in companies with own distribution network, and for better tuning of the distribution algorithms in DRP systems or modules.

 Electronic version

 Keywords: inventory management imitation modeling simulation modeling simulation model inventory planning optimization stock rationing stock DRP


MAGAZINE №4 (63) August 2014


CATEGORY Inventory management Logistics distribution  Planning the supply chain


The approach to the efficient inventory distribution to warehouses based on cascade and proportional convergence of Goods reserves system is considered in this article. The system of stock replenishment was considered and problem of warehouses demand determination was solved.


Published in Inventory management


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