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
Simulation of Dynamic Supply Chains
MAGAZINE №6(89) December 2018
AUTHOR LYCHKINA N.N.
CATEGORY Analytics and reviews Simulation modelling
ABSTRACT
This article explores the possibilities of modern simulation modeling in the tasks of design and supply chain modeling as systems with structural and dynamic complexity, the study of which should be carried out taking into account multiple risk factors and uncertainties, considering and evaluating the efficiency, dynamism, flexibility and adaptability of the SC based on a variety of indicators used in logistic practice. The use of simulation modeling requires the adaptation of modern managerial techniques and approaches used in logistic practice with the technique of simulation modeling . Useful management techniques based on the use of simulation techniques in the analysis and modeling of SCs are considered, as well as methods of constructing conceptual models of the SC and analysis of the SC using simulation modeling, iterative simulation and optimization procedures for integrated research and optimization of the SC.
A review of the capabilities of various simulation paradigms for analyzing SCs and a review of related scientific literature are also being conducted. It is shown in particular that process simulation modeling is effective for describing the network structure and logistic processes in the SC and is actively used in reengineering projects based on SCOR-recommendations. System-dynamic models of adaptive supply chains allow you to study the complex interaction of material, information and financial flows in the SC, to analyze the stability of the SC, to coordinate the business strategy and logistics strategy of the company. Agent-based simulation modeling makes it possible to describe the behavior, processes of cooperation, coordination and inter-organizational interaction of the participants of the SC and reconfigurable network structures of the SC.
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