Material flow optimization of a logging enterprise based on graph theory
MAGAZINE №6 (95) December 2019
AUTHORS GERASIMOVA M.M., MEDVEDEV S.O., MOKHIREV A.P., RUKOMOJNIKOV K.P.
CATEGORY Industrial companies’ corporate logistics Optimization and mathematical modelling
ABSTRACT
In the logging process, it is possible to build a technological chain in various ways. When transporting wood from the cutting area, water or land transport can be used. The use of forest warehouses and the processing of wood on them also increase the number of different configurations of logistics channels. Performing operations in different natural production conditions differs in productivity and material costs. The efficiency of production depends on the choice of logging technology in dynamic natural production conditions. In previous publications the authors presented a graphic-analytical model and method to solve the problem. The proposed mathematical dependencies allow us to search for the maximum material flow of the minimum cost in the logistics network of the enterprise. In addition to the dynamic component, the method differs by considering the income of the enterprise from the sale of commodity products. The purpose of this study is to use this technique to improve the logistics network of logging enterprises, considering the complex of transport, loading and unloading and processing operations in dynamic natural production conditions. The solution of the considered problem is based on the algorithm for determining the flow of minimum cost in a transport network Bascara of Gowan. It is modified because when the flow passes through any of the arcs, the throughput of arcs that reflect similar operations in the same period decreases. This considers the reduced productivity of machines and equipment involved in different parts of the logistics network. The given minimum cost flow found in this way is optimal if there are no negative cycles in the network with modified arc costs. The presented studies consider a numerical example of solving this problem for the conditions of the Krasnoyarsk territory. The numerical example showed the efficiency of the method of finding a rational logistics channel for logging operations in dynamic natural production conditions.
Keywords: process modeling process approach process management graph theory modelling logistics network dynamic model dynamic supply chains production organization effectiveness efficiency
Methods and Models of Assessing the Effectiveness of Financial Management in Industrial Logistics
MAGAZINE №1(84) February 2018
AUTHOR
CATEGORY Optimization and economic-mathematical modeling Production logistics
ABSTRACT
Analysis of the efficiency and management decisions risk is especially important today for the domestic enterprises operating in conditions of expensive financial resources and under pressure of international sanctions. The article presents various options for the formulation of the problem of the efficiency analysis of financial and material resources management in terms of their limitations. The problem of finding an optimum production expansion programme is formalized. Static and dynamic performances are given. The paper presents an example of implementing one of the models for practical solutions to a single-period problem of expanding the range of finished products. The paper shows a possibility of obtaining values of the output of each species and the procurement of equipment maximizing the profit under a given budget, certain amount of own funds required, the solution on expediency of a loan.
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Methods and models for evaluating the effectiveness of management of production and financial activities in the industrial logistics
MAGAZINE №2 (73) April 2016
AUTHORS
CATEGORY Optimization and economic-mathematical modeling Corporate logistics industrial companies Logistics production
ABSTRACT
The task of increasing the efficiency of production and and financial activities is more relevant today for domestic enterprises of the real sector of the economy, which is necessary in the coming years to solve the problem of import substitution on a number of items of products, previously imported from the European Union and the United States. The paper presents various options for setting the problem of optimizing the enterprise production program with limited material and financial resources. The dynamic and static performances, as well as a model that takes into account the uncertainty of the state of the environment. Static models belong to the class of linear and nonlinear programming. The dynamic model is the optimal control problem for which, due to the complexity of the decision procedures, proposed a method of obtaining an approximate solution based on the approximation of the integrand. Uncertainties taken into account in two models: one assumes that a priori unknown prices for finished products, the other – the best solution depends
on the advance of the unknown quantity of inflation. An example of one of the models implementation for the practical solution of the problem of production program optimization of the food industry is given in the article. It is shown that the solution can not only determine the optimum amounts of the finished product for multi nomenclature production, but also to justify the conclusion about the need to attract credit and leasing.
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A problem of quantitative estimation of supply chains' reliability and sustainability
MAGAZINE №1 (72) February 2016
AUTHOR ZAJCEV E.I., BORODULINA S.A.
CATEGORY Reliability and stability of the supply chain Uncertainty and risk in the supply chain
ABSTRACT
The modern development of supply chains create new structural formations such as process type based on SCOR-models. However, the characteristics of the model are defined only qualitatively. The interpretation of their quantitative descriptions were not conducted.
It is necessary to develop a quantitative model of their characteristics. They will help to provide the efficiency of enterprises in logistics.
The article presents two versions of quantitative description for the SCOR model characteristics.
This article describes the options of sustainability assesment based on a new standard for reliability and based on the original methodology of complex sustainability assessment for the enterprises in logistics. The original algorithm of integrated stability assessment for company's business is considered The algorithm of the sustainability comprehensive assessment can be used to assess the economic sustainability of the providers processes, also for operators in supply chain and the supply chain as a whole, as well as for the diagnosis of it’s functionality. The considered approach opens up new possibilities for the development of quantitative methods for process models assessing in logistics.
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