For the multiproduct EOQ-models the analysis of several vehicles deliveries feasibility factoring in vehicle capacity is conducted. It is proved that such deliveries with an increase in the number of vehicles that simultaneously used for a single delivery cannot be effective, if a discount is not given for the cost of such a delivery. The necessary and sufficient condition that sets the threshold level of the discount, at which the deliveries by several vehicles are able to compete with the traditional solutions, is established. The cases of numerical calculations are presented in the article.
This paper stadies management models jf current assetts in a traiding compani when initialvalues are determined and when the parametters of probblem a uncertain . Here , the methods to obtain an optimal solution , as well as an aproach to estimaite the risk of wholesale purchase and algoritm of stability analysis for optimal solution.
The purpose of this paper is to research multicriteria decision-making optimisation problems of logistics systems and supply chains considering conditions of uncertainty. The article presents an approach that allows adapting the procedures of multicriteria optimisation to the format of conditions of uncertainty. This approach is relevant for the situation when a manager does not have reliable estimates for the probability of random events and cannot use decision-making methods under risk conditions. The study proposes the synthesis of optimisation procedures, including the format of the multiple criteria decision-making theory and the format of procedures developed in the theory of decision-making in conditions of uncertainty. The specifics of this approach and algorithm for optimising such solutions are presented according to the inventory management problem.
Modification of the inventory management EOQ-model factoring in the temporary value of money (TVM) and an advance payment of the order on the basis of the credit is given in this article. Its purpose is to present for the managers an appropriate modification of the EOQ-formulas for such models (both for deliveries of one nomenclature of goods, and for multinomenclature deliveries). Usage of these modifications will allow to increase the efficiency of deliveries by taking into account the specificity of appropriate cash flows, if optimisation takes into account TVM (by the scheme of simple interest). Accepted that all payments are being realised from the revenue of the previous delivery. The necessary and sufficient condition for a possibility of such payments is established. The interest rate for factoring in the TVM reflects profitability of working capital of the modelled supply chain. It is defined in a format of the model. It is noted that the optimisation of the models of this type relate with the synergetic effect of increasing the profitability of working capital.
In this paper is developed and presented an approach to inventory management EOQ-model optimisation taking into account the time value of money and deferrals available for the order cost payments. The research is performed for models with cost-effective supply chains when due to the specified deferral an order payment, storage and other business costs can be paid from revenue. These requirements/limitations require to establish the necessary and sufficient condition for single product and multiproduct models, where the condition provides an opportunity to pay required costs from revenue of the previous reorder interval. The corresponding estimation of the profitability of working capital of such models is given in this article. It can be used when optimising supply chains with the deferred payment of the order, and taking into account the TVM. The EOQ-formula modification for determining optimal parameters of inventory management strategy taking into account the mentioned features is presented in this research. It is also shown that taking the TVM into account for such models refers to the phenomenon of reducing the profitability of working capital.
There is a hidden reserve for improving the efficiency of supply chains at inventory management. The aim of this research is to develop a special approach for optimization of such systems with regard to the Time Value of Money (TVM) according to the scheme of simple interest, and to modify the EOQ formula respectively. It is caused by the fact that in such models profits are not used to increase the total annual supply, and the interest rate for the calculation of the TVM should reflect the effectiveness of cash flow of supply chain itself. A new formula considering the TVM for EOQ is found. The analytical assessment of the interest rate, which characterizes the supply chain efficiency and is applied in calculations with the use of the generalized EOQ formula, is given. The developed method allows to receive additional synergy effect the increase in profitability of a working capital.
The purpose of this research is to develop a model for optimising total logistics costs of a trading company. To achieve the aim, a logistics system has been analysed and, as a result, major subsystems, logistics processes and most substantial logistics costs have been identified. The results of the analysis have been used to elaborate conceptual and structural optimisation models. They have been further used to develop a mathematical model considering both direct and indirect costs. The mathematical model has been tested numerically, so a table model has been worked out. The research has resulted in a Boolean linear programming model for determining the values of the indicators of the order cycle time and stock level, ensuring optimal total logistics costs of a trading company. Strategic objectives have been decomposed into the goals of individual departments, expressed with the target values of the indicators of lead time and cargo turnover.