Total Logistic Management
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ISSN 1689-5959
Issue Date
2011
Volume
Number
No. 4
Description
Journal Volume
Total Logistic Management
(2011)
Projects
Pages
Articles
EU regulations and dynamics of changes in logistics system architecture in power engineering
(AGH University of Science and Technology Press, 2011) Brzóska, Jan; Pyka, Jan
The new EU energy policy is commonly associated with climate-energy package aiming at lowering emission and use of primary energy as well as increased share of renewable energy sources. In practice the accepted policy comprises a much more complex spectrum of issues and its realization requires a number of new legal regulations. Their application will result in diverse, often significant in scale and quality changes in functioning of the economy especially in the area of power engineering and environmental protection. One of the vital elements of power industry is its logistical system. The scope of the presented work was the dynamics of the changes in the architecture of the power engineering logistic system which results from applying the new regulations of new power engineering policy. New legal regulations were presented that were the most significant for functioning of the logistic system in power engineering. The logistic system architecture in Polish power engineering was characterized and analyzed. The most important tendencies of its changes were outlined as well as their economic and social consequences.
Public-transit vehicle schedules using a minimum crew-cost approach
(AGH University of Science and Technology Press, 2011) Ceder, Avishai
Commonly, public transit agencies, with a view toward efficiency, aim at minimizing the number of vehicles in use to meet passenger demand, and therefore at reducing crew cost. This work contributes to achieving these two objectives by proposing the use of two predominant characteristics of public-transit operations planning: (a) different resource requirements between peak and off-peak periods, and (b) working during irregular hours. These characteristics result in split duties (shifts) with unpaid in-between periods. The outcome of this work is an optimal solution for maximizing the unpaid shift periods with the assurance of complying with the minimum number of vehicles attained. The optimization problem utilizes a highly informative graphical technique (deficit function) for finding the least number of vehicles, this enables the construction of vehicle chains (blocks) that take into account maximum unpaid shift periods. The latter consideration is intended to help construct crew schedules at minimum cost. The methodology developed was implemented by two large bus companies and resulted in a significant cost reduction.
Reverse logistics processes in plastics supply chains
(AGH University of Science and Technology Press, 2011) Graczyk, Magdalena; Witkowski, Krzysztof
The role of reverse logistics in creating added value for producers of plastics is presented here. The premise is the choice of reverse logistics for plastics on the one hand, considering their versatile applications, such as in the packaging, construction and automotive industries. On the other hand, an extremely important issue is that their production is characterized by high dynamics, has a significant impact on the environment, contributing significantly to the use of the valuable resource that is oil. This paper will focus on the economical and environmental optimization of reverse logistics processes in production enterprises. The presented article is part of a research project on developing application methods for the settlement of environmental-economic support for reverse logistics processes aimed at reducing consumption of energy and raw materials by plastics manufacturers, which ultimately translates into added value in terms of so-called environmental benefits.
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.
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.