Artykuły (CN-total)

Permanent URI for this collectionhttps://repo.agh.edu.pl/handle/AGH/102857

Artykuły czasopisma Total Logistic Management

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Access status: Open Access ,
Concept of production facilities layout in company Alumin, s.r.o. Slovakia
(AGH University of Science and Technology Press, 2011) Straka, Martin
The aim of part of the solution layout processing company is an analysis of the existing system of distribution of production equipment company, identification of material flows and showing the possibility of modifying the layout of production facilities in compliance with capacity, safety and quality requirements for production.
Access status: Open Access ,
Evolutionary approach for obtaining the hub and spoke structure in the logistic network
(AGH University of Science and Technology Press, 2011) Mażbic-Kulma, Barbara; Stańczak, Jarosław; Owsiński, Jan Wojciech; Sęp, Krzysztof
In order to describe transportation system, as a routine a connection graph would be used. Vertices of the graph can be train stations, bus stop, airports etc. The edges show direct connections between vertices. A direct application of such graph can be difficult and computational problems can occur while one would try to organize or optimize such a transportation system. Therefore, a method of aggregation of such graph was introduced, using the general kernel and shell structure and a hub and spoke transformation method of the source graph. These structures allow to concentrate and order the transport of goods/persons among vertices and enable to reduce the number of analyzed vertices as well as edges of the graph. In the presented paper we continue our work on kernel and shell and its instance hub and spoke methods of connection graph transformation. In this paper we develop model of the transportation system using the hub and spoke method with predetermined, minimum and indirectly described numbers of hub nodes. To obtain the desired structures, several versions of specialized evolutionary algorithm (EA) were developed and applied.
Access status: Open Access ,
Choice of order picking concepts by means of simulation tools
(AGH University of Science and Technology Press, 2010) Gałązka, Marek; Jakubiak, Michał
The pressure connected with cost cutting parallel to increase in consumer service quality, as well as speeding up the flow of goods are the result of worldwide economy trend connected with a big competition in the market. That's why in modern economy even small movements of goods on short distances are becoming more and more important. Order picking is the most laborious process in a warehouse, and according to different research, it equals to 55-65% of costs of all warehousing operations. On the basis of the existing model of a warehouse, which belongs to a logistic operator, a computer program has been created which examines the influence, of goods allocation in a warehouse and three heuristic concepts of planning the picking route, on the overall order picking time. By means of implemented simulation methods it is possible to match the appropriate order picking process to the needs of a given enterprise.
Access status: Open Access ,
Preventive maintenance of technical systems as part of risk management
(AGH University of Science and Technology Press, 2008) Okulewicz, Józef; Salamonowicz, Tadeusz
Technical objects used in logistics systems should not only be reliable, but also pose low risk arising from potential failures. Results of damage to or failure of complex objects depend on time of the failure duration and thus on the time of repairs, as well as on reliability structure and reliability characteristics of object elements. The risk connected with complex objects with serial reliability structure, both reparable and unreparable ones, was specified and analysed in the paper. The risk was mitigated by preventive replacements of object elements on the basis of statistical diagnosing. A computer simulation model was used to confirm a feasibility of minimising overall costs of preventive maintenance and failure effects.
Access status: Open Access ,
A method for scheduling the goods receiving process in warehouse facilities
(AGH University of Science and Technology Press, 2008) Ambroziak, Tomasz; Lewczuk, Konrad
The paper discusses the role of goods receiving/shipping scheduling in the warehousing process design. A formal notation of schedules is proposed and implemented in a software application for a specific analytical example.
Access status: Open Access ,
Inventory cost settings in small bucket lot-sizing and scheduling models
(AGH University of Science and Technology Press, 2009) Kaczmarczyk, Waldemar
This paper addresses models for lot-sizing and scheduling of several products on machines with limited capacity. Small time buckets in such models may arise from subdividing real (macro-)periods into several fictitious micro-periods. The inventory holding costs may then be accounted for either at the end of every micro-period or only at the end of the macro-period. Presented results of computational experiments show that these two settings lead to completely different models and solutions. After reviewing the definition of inventory holding costs, we propose a rule for correctly setting the unit costs which is essential for a correct formulation of the model.
Access status: Open Access ,
Problems of supply process reliability assessment at small and medium-sized enterprises
(AGH University of Science and Technology Press, 2008) Nowakowski, Tomasz
In the paper, the basic objectives of supply process are discussed. The importance of reliability assessment for the supply and procurement process is mentioned and some basic factors are described. The example of supply process analysis for SME is shown. The most important faults/errors of the process are described. The low costs of the faults/errors counteractions are underlined.
Access status: Open Access ,
Methodology for cost oriented assembly line balancing problems
(AGH University of Science and Technology Press, 2011) Grzechca, Waldemar
Assembly lines are special flow-lines production systems which are typical in the industrial production of high quantity standardized commodities. Assembly line balancing is based on evenly distribution of operations between workstations so that each idle time of the machines was minimal. It is assumed that operation times on the machines and the precedence relationship existing between the operations which results from the technology of the production line and the cycle time or the number of machines are known. In the paper short description about general assembly line problem and cost-oriented is described. Next the author presents description of used algorithms. A numerical example is calculated and the results are discussed. Presented paper shows that cost oriented assembly line balancing problem differs from time oriented problem and the differences are underlined.
Access status: Open Access ,
Influence of the demand planning process on logistic system reliability - case study
(AGH University of Science and Technology Press, 2011) Szozda, Natalia; Werbińska-Wojciechowska, Sylwia Ewa
Authors define the main elements affecting the right logistic system performance level and investigate the possible connections between demand process planning quality and logistic system reliability. Thus, the definitions of logistic system reliability are described. Later, an overview of some recent developments in the analyzed research area is provided. In the next point, authors present the main elements affecting the reliable and available logistic system performance. Finally, the paper is ended by the presentation of the obtained analysis results in comparison with the knowledge about the case companies' present condition.
Access status: Open Access ,
Aggregate planning in manufacturing company - linear programming approach
(AGH University of Science and Technology Press, 2011) Hanczar, Paweł Stanisław; Jakubiak, Michał
The authors take into consideration the process of translating demand forecasts (or sale plans) into production plan. In the first part of the paper the characteristics and parameters of a aggregate planning are summarized. The main part contains the proposal of integer programming model which supports aggregate planning decisions. In the proposed model production quantities, timing of inputs, inventory levels and workloads are considered. The last part of the paper contains the presentation of computational result obtained by using the introduced model.
Access status: Open Access ,
Usage of business rules in supply chain management
(AGH University of Science and Technology Press, 2009) Gaweł, Bartłomiej; Pilch, Anna
The growth of efficiency in supply chain management depends on the level of IT support in enterprise and its flexibility to adapt to changes. Business rules management systems enable dynamic adjustment to unstable environmental conditions, whereas business process management systems give support for serializing processes. The paper provides overview of new rule-based process modeling language which integrates both approaches.
Access status: Open Access ,
Logistics costs in the waste disposal system on the example of a steel mill
(AGH University of Science and Technology Press, 2011) Zwolińska, Bożena; Michlowicz, Edward
An industrial waste management system is a set of processes enabling space-time transformations along with quantity and quality changes aiming at the reduction of negative influence of the industry on the ecosystem. One of the ways of controlling the destructive impact of waste on the environment is recycling. There is no type of residue that cannot be reutilized having suitable technologies and financial resources. An important part of a company's development strategy is the profit and expenditure account. This article presents the overall costs generated within the waste management system of a full production cycle steel mill. The costs have been grouped by objects according to the criteria of main logistics processes realized within the waste management system.
Access status: Open Access ,
Cross-sectoral comparison of the effect of sales planning practices on manufacturing strategy in supply chains
(AGH University of Science and Technology Press, 2011) Szozda, Natalia; Świerczek, Artur
The goal of the paper is to make a cross-industrial comparison of the effect of sales planning practices on different types of manufacturing strategies applied in 343 producing companies operating in European, Asian and African supply chains. In order to achieve an empirical aim a necessary methodology and statistical analyses have been employed. In the result of the analysis multiple regression models have been developed for specific manufacturing strategies in supply chains operating in different industries worldwide. It enabled to make cross-sectoral comparisons of the contribution to variance in manufacturing strategy.
Access status: Open Access ,
Evolutionary approach to find kernel and shell structure of a connection graph
(AGH University of Science and Technology Press, 2009) Mażbic-Kulma, Barbara; Stańczak, Jarosław; Sęp, Krzysztof; Potrzebowski, Henryk
The theory of logistic transportation systems deals with models of phenomena connected with movement of goods and persons. The developed model of the transportation system is expected to simulate a real system, but also should help us to solve given transportation tasks. In order to describe transportation system (rail, bus or air), as a routine a connection graph would be used. Vertices of the graph can be train stations, bus stops etc.. The edges show direct connections between vertices. Its direct application can be difficult and computational problems can occur while one would try to organize or optimize such a transportation system. Therefore, a method of aggregation of such graph was introduced, using the general kernel and shell structure and its particular instances: hub-and-spoke and α-clique structured graphs of connections. These structures enable to concentrate and order the transport of goods/persons among vertices. To obtain these desired structures an evolutionary algorithm (EA) was applied. This method enables to reduce the number of analyzed vertices as well as arcs/edges of the graph.
Access status: Open Access ,
Company strategy in the crisis period
(AGH University of Science and Technology Press, 2010) Malindžák, Dušan; Mervart, Jaroslav
The article deals with the logistic strategies enabling an enterprise to create a strategy flexible in terms of business and marketing and stable in terms of manufacturing. In order to create a strategy model the following principles can be applied: shorter periods of capacity planning combined with flexible planning, SYNCRO - MRP principle, the application of forecasting in operative planning, creation with partners one of the cooperation form as supply chain, demand chain, lean supply chain, agile supply chain, leagile supply chain, and using the DBR, APS and SCP systems.
Access status: Open Access ,
Rescheduling of arrivals and departures at multi-runway airports
(AGH University of Science and Technology Press, 2008) Janik, Tomasz; Łebkowski, Piotr
The issues related to the changeability of the environment concerns primarily all the service and production systems. Proper selection of the control tools and their adjustment to the actual system operation conditions decide of the whole system effectiveness. This paper is an attempt at the development of an efficient tool supporting the control of the airplane arrivals and departures at the airports using more than one runways, with the application of the reactive approach.
Access status: Open Access ,
Classification of distribution networks
(AGH University of Science and Technology Press, 2010) Straka, Martin; Malindžák, Dušan
Distribution networks are possible to create from the final number elements. Topology of distribution networks as one of strategic decision of the design logistics system is depending on the quantitative factors, business position on the market, type of products, volume of production, location business and warehouses, from status of firm activities, from the number and its capacity of the distribution resources and other.
Access status: Open Access ,
Verification of a service level estimation method
(AGH University of Science and Technology Press, 2009) Okulewicz, Józef
Fluctuations of supply and demand require that supplementary stock be maintained which would support satisfying the demand even with temporarily delayed supplies. It has become a common practice that what is known as the safety stock serves as a reserve until the next supply arrives. However, the importance of this deviation source has been exaggerated enormously and thus it has to be verified.The paper presents a statistical model which has served as a basis for a formula for computing the safety stock, as well as formulae for computing service level, in the two ways used. Then a simulation model follows supporting the determination of customer service level. It has been proved that the service level is a better tool for estimating the safety stock protecting against random fluctuations of supply and demand.
Access status: Open Access ,
Supply strategy development in production enterprises
(AGH University of Science and Technology Press, 2008) Krawczyk, Stanisław Andrzej
The process of supply is one of the main fields of formulating and executing logistics assignments. These assignments are formulated at the managing and operational levels. The development of concepts concerning the standards of product manufacturing indicates that the process of supply should become a part of a company's strategy The paper, presents some concepts of identification of a supply strategy as a part of a company's master strategy. The classification of production elements and the market condition analysis are the start point for formulating supply strategies. The development of a supply strategy, which is only a segment of a company's strategy, requires a detailed analysis of different connections in the producing network and the system of delivery. In the author's opinion, the process of developing a supply strategy requires the identification of needs and the specification of policy connected with the requirements of marketing strategies for the products manufactured.
Access status: Open Access ,
A static model for selecting technical facilities of a logistics centre based on the tasks to be performed
(AGH University of Science and Technology Press, 2008) Jacyna, Marianna; Wiśniewski, Krystian
This paper discusses a method of optimisation of technical facilities of logistics systems. The presented approach is based on a static model of cargo flows distribution among the structural elements of the analysed system. The method has been verified using a real logistics centre as an example.