Communications - Scientific Letters of the University of Zilina, 2005 (vol. 7), issue 2
Articles
Experimental Evaluation of Selected Methods for Multigroup Train Formation
Peter Marton
Communications - Scientific Letters of the University of Zilina 2005, 7(2):5-8 | DOI: 10.26552/com.C.2005.2.5-8 
The purpose of this research project was to compare advantages and disadvantages of selected methods for multigroup train formation. Three simulation models of the marshalling yards were developed to generate and evaluate results for the selected methods. This paper summarizes the steps of the analysis and the results.
The Exact and Near Optimal Solution of the Competitive Uncapacitated Location Problem
Lubos Buzna
Communications - Scientific Letters of the University of Zilina 2005, 7(2):9-12 | DOI: 10.26552/com.C.2005.2.9-12
This paper is dedicated to the recent unprecedented boom of new supermarkets and hypermarkets in middle Europe. The motivation is to provide for the newcomers the tool for decision support, and to help answer the questions: "Is still economically advantageous to build new shopping malls and where to locate them?" We introduce the four versions of data correcting algorithm and three heuristics: simple exchange heuristic, exchange heuristics enhanced by simulated annealing metaheuristic, and genetic algorithm. All these methods were examined at the benchmarks of practical nature. This research showed the data correcting method as useable for practical...
Supply in Marketing Process of Road Transport
Anna Krizanova, Martin Hrivnak
Communications - Scientific Letters of the University of Zilina 2005, 7(2):13-16 | DOI: 10.26552/com.C.2005.2.13-16
In defining the term marketing we can come out from the sole term, which means that the term marketing is necessarily connected with market activities. These activities are arranged in a particular sequence called a marketing process. Marketing process in road transport differs in many ways from the one in the manufacturing sphere, which is determined by the fact that a road enterprise provides services. This article deals both with the issue of marketing process in road transport and position of supply in this process.
Applications of Methodology of Calculation of the Number of Connections (MCNC) in Solving Transport Attendance
Marian Gogola
Communications - Scientific Letters of the University of Zilina 2005, 7(2):17-19 | DOI: 10.26552/com.C.2005.2.17-19
This paper deals with the new MCNC (Methodology of Calculation of the Number of Connections) which is focused on the problem of transport attendance in the Zilina county. Starting from the calculation of passenger demands, social-economic parameters and the resulting calculation of the modal split, the allocation of vehicle schedule into an optimisation matrix is modelled. In the last step, the MCNC algorithm calculates a number of connections to achieve optimisation. This methodology can be used with other methodologies to find a better solution for transport attendance, to find a better solution for integration of the transport system. It is also...
Application of RCM Principles in the Air Operations
Ludek Beno, Martin Bugaj, Andrej Novak
Communications - Scientific Letters of the University of Zilina 2005, 7(2):20-24 | DOI: 10.26552/com.C.2005.2.20-24
Maintenance organizations assist in ensuring that all aircraft, their systems and parts are operated or maintained under controlled conformity to national and international airworthiness standards. Ensuring that these standards are met involves a vast network of organizations and personnel. To develop and then to comply with effective standards and procedures for maintenance program is never-ending process, which is responsible for the coordination and management of all maintenance activities and consequently manufacturing activities too. The RCM program provides a logical way of determining if preventive maintenance makes sense for a given part, system...
Note on the Coordination of Periodic Processes in Transportation Systems
Jan Cerny, Vlastislav Mojzis
Communications - Scientific Letters of the University of Zilina 2005, 7(2):25-27 | DOI: 10.26552/com.C.2005.2.25-27
The article deals with a coordination of periodic processes in transport systems. It introduces some basic mathematical models useful in process optimization. It also shows some examples of everyday transport practices where this optimization can be used.
Theoretical Framework of Vega 1/1243/04 Research: Interpersonal Interviews and Motivation
Martina Blaskova
Communications - Scientific Letters of the University of Zilina 2005, 7(2):28-32 | DOI: 10.26552/com.C.2005.2.28-32
This paper is a result of the research project VEGA No. 1/1243/04 "Highly-educated human potential management and development". It deals with the importance of basic types of interviews used in human potential management and development. It presents and argues the results of a selective, orientation, appraisal and exit interview. It highlights positive and negative aspects of these types of interviews. It confirms that managers and staff from personnel departments can enhance their perception of these interview techniques. It must be borne in mind and remembered that there is always a very strong motivational accent in these interviews.
Application of Support Vector Machines to the Modelling of Inflation
Dusan Marcek, Milan Marcek
Communications - Scientific Letters of the University of Zilina 2005, 7(2):33-37 | DOI: 10.26552/com.C.2005.2.33-37
In Support Vector Machines (SVM's), a non-linear model is estimated based on solving a Quadratic Programming (QP) problem. Based on work [1] we investigate the quantifying of econometric structural model parameters of inflation in Slovak economics. The theory of classical Phillips curve [8] is used to specify a structural model of inflation. We provide the fit of the models based on econometric approach for the inflation over the period 1993-2003 in the Slovak Republic, and use them as a tool to compare their approximation ability with those obtained using SVM's method. Some methodological contributions are made for SVM implementations to the causal...
Contact Area and Normal Stress Determination on Railway Wheel/Rail Contact
Tomas Lack, Juraj Gerlici
Communications - Scientific Letters of the University of Zilina 2005, 7(2):38-45 | DOI: 10.26552/com.C.2005.2.38-45
It is important to study the field of railway wheel /rail contact area from the point of view of stress distribution for further investigation of running behavior of a vehicle when running on a rail track. There is a contact of two spatial geometrically defined bodies, which have characteristic material properties, by a power effect of a vehicle through the wheel on the rail. The contact point is transformed into the contact area as a result of the pressure of the bodies against each other. It is possible to acquire the image of the contact area and the stress which appears at the contact as a result of the application of a known calculation method...
Web Site Contents of Municipal Transport Undertaking as a Modern Communication Tool for Enhancing Quality of Transport Services
Pavel Drdla, Jan Hrabacek
Communications - Scientific Letters of the University of Zilina 2005, 7(2):46-48 | DOI: 10.26552/com.C.2005.2.46-48
The paper deals with web site contents of Municipal Transport Undertakings. In the paper there are introduced kinds of information in use improving and intensifying communication between customers (passengers) and transport operators. These data come from research results of several Municipal Transport Undertaking web sites.There is also mentioned an informative minimum, which is found to be necessary and should not be omitted.
Towards Versatile Simulation Models of Transport Nodes
Norbert Adamko, Valent Klima, Antonin Kavicka
Communications - Scientific Letters of the University of Zilina 2005, 7(2):49-53 | DOI: 10.26552/com.C.2005.2.49-53
The paper deals with analysis of characteristics of simulation tools and models which are required for support of dispatcher's decisions in real operation, training of dispatchers and education. Further, a concept of simulation tool is discussed that will allow the construction and development of simulation models in which support for re/design of railway system, its management and also the training of dispatchers will be integrated.
The Block Matching Algorithm and Its Use for Vehicle Motion Description
Martin Capka
Communications - Scientific Letters of the University of Zilina 2005, 7(2):54-57 | DOI: 10.26552/com.C.2005.2.54-57
This paper deals with principles of Block Matching Algorithm (BMA) and its use for vehicle detection and tracking. The Block matching plays essential role in motion estimation employed in the MPEG compression standard. The current frame is divided by BMA in smaller, fixed size blocks. These blocks are then matched in the previous frame in order to estimate their displacement between two successive frames. BMA supplies us with information referred to as motion vectors. Motion vectors are next processed to gain relevant data for vehicle detection and tracking.