Total Logistic Management
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ISSN 1689-5959
Issue Date
2009
Volume
Number
No. 2
Description
Journal Volume
Total Logistic Management
(2009)
Projects
Pages
Articles
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.
Streamlining the car order picking tasks in a warehouse
(AGH University of Science and Technology Press, 2009) Jakubiak, Michał
An attempt to find the best possible way to allocate goods in a warehouse, so as to make the process of completing the order as short as possible, is the subject of this paper. Order picking is the most laborious warehouse process and it contributes to 55%-65% of all the costs of operations performed in a warehouse. In a modern warehouse every manipulation of materials is subjected to detailed verification at the stage of planning. The best possible goods- allocation allows to fully exploit the limited capacity of a given warehouse and to reduce the number of manipulations with a given product. The small shifts of goods on a short distances are starting to play a very important part. On the basis of a practical problem observation in a company, a computer program has been created. This program helps to simulate different goods allocation variants in a way which makes the process of order picking as short as possible.
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.
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.
Subassembly flow control with the Kanban system as a component of Lean Manufacturing at a production enterprise
(AGH University of Science and Technology Press, 2009) Michlowicz, Edward
The paper analyses the Kanban system introduced at a company manufacturing multiple types of rotors for electricity-powered engines. The system comprises two loops of Kanban cards: the production card loop and transport card loop. The main assumptions for the system is the capacity minimisation for buffers between operations and streamlining the information flow between individual production cells. The analyses use the 7M, 5S and SMED methods, as well as a combination of the ABC and XYZ classification methods for materials. The introduction of the Kanban system significantly reduced warehouse stocks and improved communication between individual production lines.