Communications - Scientific Letters of the University of Zilina, 2010 (vol. 12), issue 3A
Articles
Numerical Simulation of Groundwater Flow and Pollution Transport Using the Dual Reciprocity and RBF Method
Karel Kovarik
Communications - Scientific Letters of the University of Zilina 2010, 12(11):5-10 | DOI: 10.26552/com.C.2010.3A.5-10 
Transport of pollution is strongly influenced by groundwater flow. All numerical models of transport equation must be based on the groundwater flow models. The most of them suffer from numerical diffusion and/or oscillations of solution. Both phenomena lower the quality of results of these models. Plenty of authors are working on improving the quality of the numerical simulation. This paper presents the connection between a dual reciprocity method used to model groundwater flow and the meshless radial basis function methods used for a transport model. Both methods are one of the latest tools for modeling these phenomena.
Probabilistic Analysis of Resistance Degradation under Corrosion
Josef Vican, Marian Sykora
Communications - Scientific Letters of the University of Zilina 2010, 12(11):11-16 | DOI: 10.26552/com.C.2010.3A.11-16
To observe the behaviour and resistance of steel bridges with the orthotropic plate decks, the nonlinear finite probabilistic model in the ANSYS software environment was developed using software support module PDS. Random variables were described by means of parameters of probability density function according to data determined experimentally. The model takes also into account the geometrical and material nonlinearities of the structure. The major aim of the paper is to obtain the corrosion effects influence on the resistance of this structural system. Therefore the time variant loss of member resistance was computed based on selected corrosion models.
Analysis of Particulate Matter Composition
Daniela Durcanska
Communications - Scientific Letters of the University of Zilina 2010, 12(11):17-22 | DOI: 10.26552/com.C.2010.3A.17-22
According to current research, particulate matter (PM) has a negative impact on citizens in particular (respiratory and cardiovascular diseases). Based on EU studies, deaths of 347,900 Europeans are attributable to air pollution. Formation of particulate matter from road transport has been a concern for big cities in particular.For long time monitoring PM we choosed the sections of roads located both within urban areas and rural areas were selected for longterm monitoring, differing in particular by the surface of the roadway - either with asphalt concrete paving (AC) or with stone mastic asphalt (SMA) paving, an asphalt compound with disintegrated...
Influence of Capacity Restraint Functions on Traffic Distribution and Their Practical Use in the Traffic Modelling
Martin Bartovic, Marek Drliciak
Communications - Scientific Letters of the University of Zilina 2010, 12(11):23-27 | DOI: 10.26552/com.C.2010.3A.23-27
The article deals with the issue of capacity restraint functions (curves) determining for roads and their use in the transport model. It describes the procedure for obtaining traffic flow characteristics and the derivation of the parameters needed to create basic restraint BPR function (Bureau of Public Roads). New parameters were then used in traffic assignment process. The impact of parameter changes for routes redistribution on traffic network was evaluated in detail.The practical use of BPR function in the real traffic model is described in the second part. The article presents the method of volume-delay function definition for different model...
Inter-Laboratory Comparison of Accredited Laboratories in Terms of Benchmarking in Slovakia
Maria Trojanova, Katarina Zgutova, Lubomir Pepucha, Martin Pitonak
Communications - Scientific Letters of the University of Zilina 2010, 12(11):28-35 | DOI: 10.26552/com.C.2010.3A.28-35
The overall implementation of active benchmarking - the transfer and implementation of good practice in a closed circle in inter-laboratory comparisons its one of his components. To ensure that mission it's been created inter-laboratory comparisons model for benchmarking - and as a support web system. The system is open to different types of quality indicators and its c showing basics compliance with accreditation requirements.
Waiting Time Optimization with IP-Solver
Jaroslav Janacek, Michal Kohani
Communications - Scientific Letters of the University of Zilina 2010, 12(11):36-41 | DOI: 10.26552/com.C.2010.3A.36-41
This paper deals with two different public transport problems, in which the same phenomenon of waiting time occurs. In the past, both the problems were solved in the same way, which included rearrangement of the original problems to simpler max-min problems. These simplified approaches were used due to that time state of optimization software. In connection with building new computational laboratories equipped with new optimization environment, we want to come back to the more precise original quadratic models of the problems and explore new possibilities in obtaining the optimal solution of the original problems. We have done an analysis of those...
Dynamic Architecture for Analytical Its Services
Michal Zabovsky, Matus Chochlik, Karol Matiasko, Eva Valentikova
Communications - Scientific Letters of the University of Zilina 2010, 12(11):42-45 | DOI: 10.26552/com.C.2010.3A.42-45
The emergence of various technologies allowing the real-time collection, processing and transfer of data between stationary traffic devices, moving vehicles and data centers provides many new possibilities for Intelligent Transportation Systems (ITS). However, the need for mobile access to analytical data leads to problems with mobile computers connectivity. Mobile computers often suffer from limited connectivity or lack of network access. Existing data replication solutions are not well suited for mobile scenarios as well as algorithms used for data replication, in spite of the fact that it is the most desirable environment. In the following paper...
Proposal for the Size of the Fleet to Provide Winter Road Maintenance
Miroslav Gabor
Communications - Scientific Letters of the University of Zilina 2010, 12(11):46-49 | DOI: 10.26552/com.C.2010.3A.46-49
The article describes an optimisation model which was used to create the operation plan of winter road maintenance [6]. The model takes into consideration a number of factors of road description, such as road network topology, road categories and level of services. They result in suggesting the necessary number of vehicles the centres of winter road maintenance should have to be able to keep, the servicing time limit given by the operation plan in case of a calamity. The model also proposes what the most optimal vehicle routing would be timewise.
Distributed Database Systems in Vehicular Ad-Hoc Network
Jan Janech, Tomas Baca
Communications - Scientific Letters of the University of Zilina 2010, 12(11):50-54 | DOI: 10.26552/com.C.2010.3A.50-54
The article introduces basics of classic Distributed Database System (DDBS) and explains its unsuitability for dynamically changing networks such as Vehicular Ad-hoc Network (VANET). Thus a concept of a new architecture is proposed. This new architecture is designed for use in mobile networks as it solves problems of classic architecture, however as explained at the end of the article, it has some limitations of its own.
Transmit Power Control Analysis in V2x Communication System
Juraj Micek, Jan Kapitulik
Communications - Scientific Letters of the University of Zilina 2010, 12(11):55-59 | DOI: 10.26552/com.C.2010.3A.55-59
Transmit power control is applied for reduction of transmission power to the level needed for reliable communication. The article describes problematic of transmit power control in ad-hoc V2X communication system applied in intelligent transport system environment.
The Column Generation Technique for Public Transport Line Planning by IP-Solver
Jaroslav Janacek, Jan Sirc
Communications - Scientific Letters of the University of Zilina 2010, 12(11):60-64 | DOI: 10.26552/com.C.2010.3A.60-64
The paper deals with an application of the column generation method to the public transport line planning making use of a common optimization environment. The authors focus on the opportunities offered by the optimization software for the column optimization and for manmachine approach to the process of line planning. The paper resumes the former approach to the transport line planning based on line selection from a large set of all sensible lines and, on the contrary to the former approach, introduces the column generation method for a new route design. A case study from practice is used to compare both approaches and to point out their advantages...
GTN - Information System Supporting the Dispatcher and Remote Tracks Control
Emil Krsak, Hynek Bachraty, Vlastimil Polach
Communications - Scientific Letters of the University of Zilina 2010, 12(11):65-74 | DOI: 10.26552/com.C.2010.3A.65-74
When constructing new corridor tracks, but also when reconstructing the existing ones of all categories, new significant improvements and innovations occur in the contruction area. Consequently, the same phenomenon occurs in the newly installed securing, interlocking and signalling equipment, and generally enabling also remote track control. The traffic information and controlling system (hereinafter the GTN) being developed by the Software Technologies Department of the University of Zilina in cooperation with the AZD Praha Company, represents a graphical and technological extention of the electronic signalling equipment. It contains a compact data,...
Architecture of Providing Services in Intelligent Transportation Systems Using Semantically Defined Information
Patrik Hrkut
Communications - Scientific Letters of the University of Zilina 2010, 12(11):75-79 | DOI: 10.26552/com.C.2010.3A.75-79
Intelligent transportation systems (ITS) is an area currently developing very fast. The key to the ITS success will definitely be the implementation of services which would be solving all of the requirements of the road transportation participants. The article proposes the architecture to be used to control the services provided within the intelligent transportation systems. The architecture presupposes using semantically modelled information to be able to find new services in more intelligent way, to preliminarily distinguish unknown services and use them anyway.
Wireless Sensor Networks for Road Traffic Monitoring
Juraj Micek, Ondrej Karpis
Communications - Scientific Letters of the University of Zilina 2010, 12(11):80-85 | DOI: 10.26552/com.C.2010.3A.80-85
The paper presents an analysis of communication technologies that should lead to choosing technology appropriate for road traffic monitoring. One of the best available communication technologies is standard ZigBee. Experimental measurements of data rate with respect to distance under different operating conditions are presented. Based on obtained results it is possible to say that using ZigBee technology in wireless sensor networks is appropriate if we expect lower data rates (70 kbps).
Intelligent Traffic System: Cooperation of Manet and Image Processing
Stefan Badura, Anton Lieskovsky
Communications - Scientific Letters of the University of Zilina 2010, 12(11):86-92 | DOI: 10.26552/com.C.2010.3A.86-92
This paper presents a model for intelligent traffic system. Proposed methods describe ideas of information computing from images and its distribution to different nodes in traffic system. Two algorithms for foreground extraction forwarded by classification of extracted objects are discussed in the paper.. These approaches serve as a basis for information computing. Communication framework over MANET is presented for efficient information delivery. Appropriate protocol is designed at first, and then some algorithms for efficient data delivery are discussed.
Modelling of Safety Characteristics of Redundant Safety - Related Transmission System via Markov's Analysis
Jan Rofar, Maria Franekova, Peter Holecko
Communications - Scientific Letters of the University of Zilina 2010, 12(11):93-97 | DOI: 10.26552/com.C.2010.3A.93-97
The paper deals with problems of safety features modelling using a safety-related redundant transmission system as part of a safety -critical control system. The main part of the paper is oriented to the Markov model description which was realised for a 1oo2 redundant transmission system. The results of quantitative safety analyses are valid for the fail safe redundant transmission system - Profibus DP with a ProfiSafe safety profile.
Hydrogeologic Framework of the Gardunha Mountain: Northeast Area - Central Portugal
Eric Mendes, Paulo E. M. Carvalho, Luís M. Ferreira Gomes
Communications - Scientific Letters of the University of Zilina 2010, 12(11):98-103 | DOI: 10.26552/com.C.2010.3A.98-103
The present paper describes the hydrochemical evolution of mineral groundwater in the northeast area of Gardunha mountain (centre region of Portugal) which is formed by low permeability igneous rocks. For this study were considered 50 water samples and analyzed the values of major ions. The methodology used consisted in the use of Piper diagrams that had allowed to identify the water chemistry and in the application of statistical techniques of multivariate analysis, including factor analysis. The results guided to sodium-bicarbonate water type, with very low mineralization, designated by fresh water in relation to total solids and soft in relation...
Intelligent Compaction Technique as a Tool of Objective and Effective Application af Geosynthetics
Libor Izvolt, Jan Kardos
Communications - Scientific Letters of the University of Zilina 2010, 12(11):104-111 | DOI: 10.26552/com.C.2010.3A.104-111
The paper focuses on evaluation of the current state of designing and realization of railway substructure layers on modernized Slovak railway tracks with the emphasis on an effective use of geosynthetic products. The presented method of intelligent compaction may significantly increase efficiency of design and realization of construction layers with the objective use of geosynthetics and other adjustments at various geological conditions of subgrade.
Using Predictive Controller to Control a Nonlinear System
Jozef Hrbcek, Vojtech Simak, Ales Janota
Communications - Scientific Letters of the University of Zilina 2010, 12(11):112-115 | DOI: 10.26552/com.C.2010.3A.112-115
This paper engages in the Model Predictive Control of an Air Pressure system. The Air Pressure system includes a pneumatic and an electronic part. The model of the system was created using a tool for systems identifications. Since the system is nonlinear we can use the model linearization and set the constraints to create the Model Predictive Controller in MATLAB environment. The connectivity between PC and the air pressure system is realized by I/O card MF624. We provided the stability test as well. The PID controller was also designed to compare the results with those obtained from the Model Predictive Controller of the mentioned Air Pressure control...
The Centre of Excellence for Transport Service and Control
Jozef Gnap, Alica Kalasova, Marian Gogola, Jan Ondrus
Communications - Scientific Letters of the University of Zilina 2010, 12(11):116-120 | DOI: 10.26552/com.C.2010.3A.116-120
The Centre of Excellence at the University of Zilina was established in 2009 as a new approach to research supported by EU. This model has been acknowledged around the EU as a highly effective way to strengthen a country's research capacity, build partnerships and translate discoveries and advances into economic prosperity and a better quality of life for all citizens. The Centre of Excellence for transport service and control at the Faculty of Operation and Economics of Transport and Communications at the Department of Road and Urban Transport consists of the laboratory of transport service, laboratory of mass passenger transport control and laboratory...
Trend of Public Mass Transport Indicators - As a Tool of Transport Management and Development of Regions
Jana Dicova, Jan Ondrus
Communications - Scientific Letters of the University of Zilina 2010, 12(11):121-126 | DOI: 10.26552/com.C.2010.3A.121-126
Quantification of customer requirements is necessary for all managers that continually monitor changing transport market environment and the quantification also introduces a fundamental tool that allows evaluations of current situation. On the basic assess of reached results in last periods of time the quantification also contributes to create a quality proposal of future lead to entrepreneurship in transport. The article deals with problems of possible application of appropriate methods of application that allow to reach the best quantification of next customer requirements in transport, also contribute to realization of strategic objectives and development...