MAGAZINE №1(84) February 2018

AUTHORS GUSEV D.A.MAZUNINA О.А.FEL A.V.

CATEGORY  Optimization and mathematical modelling Sourcing 

ABSTRACT

 Consideration of the supply chain from the point of view of objective understanding as a set of individuals and legal entities, interacting specifically and precisely in material, financial and information flows, presupposes the availability of a tool for fixing the rules for interaction of such parties. Such a tool already exists, it is a contract / agreement / agreement of the parties. It is the contract model of the supply chain that is of great importance in the process of value formation of the product, as it can be considered as a legal documental basis for mutual arrangements for the supply chain. Contract management tasks in the supply chain in terms of the optimal contract model choice are formalized it the paper for the first time as decision-making tasks under many criteria. This format of models allows to consider risks that can be formalized in the form of separate individual criteria. It is shown that a dimensionality phenomenon is associated with problems of this type which can be eliminated on the basis of a transition to new formats for the presentation of estimates of particular criteria: 1) the format of generalized selection criteria; 2) to the standardized form of the problem of choice. For both approaches, tasks of multicriteria choice of the contract model are formalized.

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MAGAZINE №1(84) February 2018

AUTHOR Kuznetsov V.O.  - Postgraduate student, Department of Logistics and Supply Chain Management, National Research University Higher School of Economics (St.-Petersburg, Russia)

CATEGORY  

ABSTRACT

On the one hand, the relevance of this research is determined by an attempt of solving the problem of optimal inventory allocation, which can open the possibilities for increase in stock turnover. On the other hand, there was an attempt to extend the list of problems which can be solved by operations research methods. The potential of application of operations research methods (transport model as a specific case of linear programming, in particular) is underestimated. According to Taha [2011], a transport model is a problem of finding optimal allocation of homogeneous objects from accumulators  to receivers  with minimizations of costs on displacement or movement. In our opinion, the canonical form of a transport model represents accumulators as points of departures, receivers as clients and cost on displacement as transport costs. The paradigm of using this model is constrained by using the latter in transport logistics only. In fact we can apply this model in much more problems (micro, meso or macro level). This study shows that objects and variables from the canonical transport model can be represented as objects from different fields (beyond logistics)  thus helping to find an optimal solution to a certain problem. Our study represents accumulators as nominal cells where work-in-process (WIP) product is in the warehouse, receivers - as production lines and costs on displacements as mileage of loaders. Thus, the cost function Z that we want to optimize is the function of mileage of loaders. Minimizing function Z will enable us to find the optimal allocation of WIP products to production lines (next production stage)

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MAGAZINE №5 (82) October 2017

AUTHORS  GERAMI V.D.KOLIK A.V., SHIDLOVSKIY I.G.

CATEGORY  Optimization and mathematical modelling Inventory management

ABSTRACT

A new improved algorithm to optimize the parameters of a diversified supply strategy considering the transportation features for the EOQ-models is proposed. When optimizing decisions it will allow for the first time to take into account the following attributes of the simulated supply chain: 1) cargo capacity of the vehicles used; 2) a possibility of selecting their types when delivering goods; 3) the format of paying storage costs (rent or paying only for occupied places at the warehouse); 4) expediency of deliveries using several vehicles if there are discounts on the cost of such deliveries; 5) factor of time value of money taking into account the efficiency of cash flows of the supply chain itself; 6) assessment of the expected return on the working capital of the simulated supply chain; 7) specificity of such a profitability indicator taking into account the utilization of the cargo capacity of the vehicles used at the deliveries. This algorithm was developed with reference to special EOQ-models. Namely, it relates to a class of models interesting and important for business when profit can be made at each reorder interval. The models in question are those where profit during the reordering interval can be used both to cover part of the costs at that interval and to make payment of the next delivery. Therefore, the format of the algorithm will consider necessary and sufficient conditions fulfillment of which allows to ensure the possibility of these payments from the profit during the supply chain operation. 

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MAGAZINE №3 (80) June 2017

AUTHORS  

MISHENKO A.V.

KULAGIN P.A. - Postgraduate student, Department of Mathematical Methods in Economics, Plekhanov Russian University of Economics (Moscow, Russia)

CATEGORY  Optimization and mathematical modelling  Transportation in logistics

ABSTRACT

The article considers the task associated with the analysis and the evaluation of metal trading company business processes. Particularly, these business processes are connected with the shipments from the supplier's warehouse and the optimization of the transport customer service in the most efficient way as the related services for the main activities. The implementation of enterprise services for the provision of transport services and increasing their share in the total volume of shipments of finished products to customers is suggested. In the article the model of transport service organization efficiency estimation in the metal trading company subject taking into account the restrictions on the existing capacity, traffic and intensity of service is suggested. Also, the model takes into account the dynamics of the finished product flow from the production to the trader warehouse inside the considered transportation network to further its implementation, shipment and export. The problem which is stated in the article is solved by means of economic-mathematical modeling. 

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MAGAZINE №1 (78) February 2017

AUTHOR SVERCHKOV P.A.  

CATEGORY  Retail companies’ corporate logistics Distribution logistics

ABSTRACT

The article deals with different approaches to the design of the distribution network, developed by a number of Russian and foreign researchers, and the applicability of these approaches to problems of network optimization in retail companies. The relevance of the article creates by the role that logistics plays for businesses in Retail, and the possible effect on the value of logistics costs and service levels that can be achieved with the use of modeling tools and logistics networks optimization. In the first part of the article, the problem statement and the relevance are described in detail. In the second part, the author presents a comparison of the five most wellknown and commonly used approaches to the distribution network design, using a specific set of comparison criteria. In the conclusion, the author analyzes the specifics of the selected approaches and how it can be improved in order to adapt the algorithms to network design problem in Retail. As such, the following areas of improvement are mentioned:

1. Consideration of strategic factors specific to the retail industry, which affect the design of distribution network.

2. Segmentation of the distribution network into regions, product categories, formats of trade and / or distribution channels;

3. The combination in a single algorithm of common sequence of actions for network design with mathematical optimization techniques

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MAGAZINE №1 (78) February 2017

AUTHORS  MILOV S.N. 

CATEGORY  Analysis in logistics and SCM Controlling Inventory management Logistics service management Retail companies’ corporate logistics

ABSTRACT

Nowadays the development of retail chain stores format takes place. Some companies go own way, while others use benchmarking but all of them are interested in profitability maximization on condition that the overstock and out-of-stock levels are optimal. In the article the SCM project results are discussed. It is shown that it helped to reduce stock level by several times in a big federal retail company. After the successful solution of the problem there was detected the aberrant behavior of one of the «Perfect Order» indicator elements. It is the «Quality of the order implementation». This has brought to the extemporaneous short-run losses. In the article the alternative to this indicator is proposed and the realization is demonstrated.

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MAGAZINE №6 (71) December 2015

AUTHOR  

RYBAKOV D.S.

Deputy Logistics Director, «Formula of Space»
Postgraduate student, Department of Information Economic & Management Systems, Institute of Industrial Economics and Management, Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

 

CATEGORY   Logistics services Management  Optimization and economic-mathematical modeling  Corporate logistics retailers 

 

ABSTRACT

 

The concept of cross-functional coordination defines the interaction of business units, which gives the overall optimal results of the company. Difficulties associated with the various units interaction are typical for enterprises of different economy sectors. One of the most important issues in trade enterprises is the problem of marketing and logistics departments’ interaction in determining the optimum level of customer service. The problem is in searching a balance between the level of logistic service provided to consumers, and the level of total logistic costs associated with maintaining a defined level of service. The purpose of this study is to develop a mathematical optimization model of logistic service of trade enterprises. It is assumed that logistic service of the enterprise has a number of components (indicators) of service, each of which has different variants (possible values). Implementation of the service component in a particular variant affects the values of revenue and total costs of the enterprise. It is necessary to find such combination of service components variants, which will provide the maximum profit for trade enterprise. To achieve this goal the analysis of the trade enterprise external environment is carried out; conceptual and structural optimization models are developed. On their basis the mathematical model of linear programming (LP) is developed. The LP model is tested on a numerical example, so a tabular model is also created. For the stage-by-stage solution of the optimization problem, the LP model is transformed to dynamic programming model. The limits of models applicability are defined. In the study a mathematical model of linear programming with Boolean variables, which provides finding optimal variants of logistic service components and complies with the restrictions, is created. As an alternative, a dynamic programming model is developed. An important advantage of this model is the possibility, during the phased decision-making, to implement a satisfactory solution, from the decision-maker point of view, and not mathematically optimal solution. The progress and results of the study show that total logistic costs, which are the main component of models, require detailing, and the process of their formation - definition of mathematical ratios, with the aim of developing integrated model for determining the optimal level of service and costs of subsystems of the trade enterprise logistics system.

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MAGAZINE  №1 (54) February 2013

AUTHOR  Filatova T.A.

CATEGORY  Optimization and economic-mathematical modeling Sourcing Uncertainty and risk in the supply chain Logistics services Management Planning the supply chain 

ABSTRACT

 In article economic aspects of quality of work supply chains, optimizing and qualimetrical approach to an assessment of quality of work supply chains production are considered and versions of the plan of deliveries with use the various directions of modeling are calculated.

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MAGAZINE  №1 (54) February 2013

AUTHOR  Sokolova O. G. 

CATEGORY  Corporate logistics industrial companies Optimization and economic-mathematical modeling Inventory management 

ABSTRACT

The logistic chain of mining company is analyzed, since mining and finishing shipment of finished goods to the consumer. Considering features of functioning of the mining enterprises ways of stockpile management are offered: in a subsoil, in enterprise warehouses (inventory holdings, stocks of ore and finished goods), stocks of a work in progress and in enterprise dumps. It is shown that use of different types of stocks demands optimization of their size.

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Published in Inventory management

MAGAZINE  №1 (60) February 2014

AUTHOR  VASILYEV A.M.

CATEGORY Optimization and economic-mathematical modeling Reliability and stability of the supply chain Uncertainty and risk in the supply chain 

ABSTRACT

The paper presents an approach to modeling the process of the logistics system as a Queuing system with breaks, considered various options for determining the parameters of the operation of the logistics systems taking into account transients on a regular basis (breaks). 

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