Communications - Scientific Letters of the University of Zilina, 2013 (vol. 15), issue 2

Articles

Articles

Distributed Database Systems and Data Replication Algorithms for Intelligent Transport Systems

Jan Janech, Tomas Baca, Anton Lieskovsky, Emil Krsak, Karol Matiasko

Communications - Scientific Letters of the University of Zilina 2013, 15(2):6-12 | DOI: 10.26552/com.C.2013.2.6-12  

One can look at the vehicular ad hoc network (VANET) as at the source and storage of information useful for the safety, fluency and comfort of road traffic, which makes it a valuable tool for ITS. Our research is focused on data dissemination in VANET. We perceive the nodes of VANET as the nodes of a distributed database system (DDBS). As such they do not only store data but they also create new data. Normally, in the course of time the data lose their usefulness. The system we designed was tested by means of a computer simulation carried out by the simulation tool AdHocSim.FRI.

Fuzzy Logic Networks for Speech Recognition

Stefan Badura, Stanislav Foltan, Martin Klimo

Communications - Scientific Letters of the University of Zilina 2013, 15(2):13-18 | DOI: 10.26552/com.C.2013.2.13-18  

This paper proposes a massive fuzzy logic network which can be considered as a novel model of pattern classification network. Our approach introduces fuzzy logic circuits fulfilling the function of a binary classifier at first, which are connected into fuzzy logic networks with fuzzy flip-flop circuits as memories. Genetic programming is used as a circuit designing method. In order to establish design methodology, experiments aimed at testing the suitability of fuzzy logic operation sets, fitness functions and parameters of genetic algorithm were carried out. From trained circuits a hierarchical layered structure is built, where single layers consisting...

Future Airports Development Strategies

Antonin Kazda, Benedikt Badanik, Anna Tomova, Isabelle Laplace, Nathalie Lenoir

Communications - Scientific Letters of the University of Zilina 2013, 15(2):19-24 | DOI: 10.26552/com.C.2013.2.19-24  

Air transport was traditionally highly regulated, fragmented and protected. With European air transport market deregulation in the mid 1980s also airports could respond to new factors. Methodology developed within the FAST project analyzed evolution of airport strategies potential in the forthcoming decade in the frame of new airport typology reflecting different strategies depending on the airport size, market type and market potential.

Regional Dimensions of Knowledge Processes in the Sectors of Transport and Logistics and ICT in the Zilina Region

Tatiana Corejova, Maria Rostasova, Alena Chrenkova, Emilia Madudova

Communications - Scientific Letters of the University of Zilina 2013, 15(2):25-33 | DOI: 10.26552/com.C.2013.2.25-33  

The paper presents the results of the APVV project - Regional dimensions of knowledge economy, which was solved in the Department of Communications, Faculty of Operation and Economics of Transport and Communications, University of Zilina during 2008 - 2011. The paper briefly describes logistics sector and ICT sector in the Zilina region and their knowledge management. Significant results of the project were achieved through knowledge biography, which maps creation, processing and dissemination of knowledge. Based on this methodology the case studies in selected logistics and ICT enterprises in the Zilina region were created. The results of sectoral...

Meshless Analysis of an Embankment Using Local Galerkin Radial Point Interpolation Method (LGRPIM)

Juraj Muzik, Karel Kovarik, Dana Sitanyiova

Communications - Scientific Letters of the University of Zilina 2013, 15(2):34-40 | DOI: 10.26552/com.C.2013.2.34-40  

The paper deals with use of the meshless method for slope stability analysis. There are many formulations of the meshless methods. The article presents the Local Galerkin Radial Point Interpolation method (LGRPIM) - local weak formulation of the equilibrium equations. The main difference between meshless methods and the conventional finite element method (FEM) is that meshless shape functions are constructed using randomly scattered set of points without any relation between points. The shape function construction is the crucial part of the meshless numerical analysis in the construction of shape functions. The article presents the radial point interpolation...

Buildings Structure Response Due to Railway Traffic

Jan Bencat, Krzysztof Stypula

Communications - Scientific Letters of the University of Zilina 2013, 15(2):41-48 | DOI: 10.26552/com.C.2013.2.41-48  

The free-field dynamic response at the distance and dynamic response of building structures due to railway traffic calculation procedures is described in this paper. The viscoelastic halfspace model is used both for evaluation of the track-soil interaction forces as well as for prediction of the ground-borne vibrations spectral functions at the distance. In the next step these functions are applied for building structure dynamic response calculation via relevant computational building structure model.

Project Spens - Sustainable Pavement for European New Member States

Daniela Durcanska, Martin Decky, Roman Licbinsky, Jiri Huzlik

Communications - Scientific Letters of the University of Zilina 2013, 15(2):49-55 | DOI: 10.26552/com.C.2013.2.49-55  

This paper represents the main results of work package 5 of the SPENS project (Sustainable Pavements for European New Member States) that was focused on assessment of the impact of roads on the environment and where the Faculty of Civil Engineering of University of Zilina was the most active and closely cooperated with CDV.Collaborative international project was focused on particulate matter (PM) production due to mechanical abrasion of road pavements. PM (and noise emission) was captured next to roads with different pavement types (stone mastic asphalt and asphalt concrete) by middle volume samplers with consequent gravimetric analysis of each exposed...

Portal of Security and Safety Engineering as a Tool to Increase the Sustainable Development of Higher Education in Security in the European Union and Beyond

Tomas Lovecek, Jozef Ristvej, Katarina Kampova, Juraj Vaculík, Roberto Gamboa, Adam Zagorecki

Communications - Scientific Letters of the University of Zilina 2013, 15(2):56-62 | DOI: 10.26552/com.C.2013.2.56-62  

In this article we describe a project "Competency Based e-Portal of Security and Safety Engineering" - eSEC portal approved by The Education, Audio-visual and Culture Executive Agency (EACEA), developed in the period between 10/2009 and 10/2012. The eSEC portal is one of 10 centralised multilateral projects approved in 2009 by EACEA and only one with the University of Zilina as a coordinator, with total budget 356.138 Euros. The EACEA is responsible for the management of certain elements of the EU's programs in the fields of education and culture. The idea for the eSEC project originated from the demand to increase the quality of education in the field...

Complex Model of Risk Assessment of Industrial Processes Mopori

Katarina Holla, Katarina Kampova, Andrea Peterkova, Andrew Collins

Communications - Scientific Letters of the University of Zilina 2013, 15(2):63-68 | DOI: 10.26552/com.C.2013.2.63-68  

Modern day society wants to create optimal living conditions for its citizens and to ensure constant sustainable development. This objective cannot be achieved without reaching the required level of perceived security in complex. One of the areas that threaten the lives and property of people and are harmful for the environment is the anthropogenic crisis phenomena, which also include industrial accidents. Prevention of these accidents and subsequent reaction are the key issues considering adjustment of the level of security not only for the citizens of Slovakia, the European Union but also worldwide. The article focuses on the problem of prevention...

Surface and Subsurface Residual Stresses after Machining and their Analysis by X-Ray Diffraction

Andrej Czan, Eva Tillova, Jozef Pilc

Communications - Scientific Letters of the University of Zilina 2013, 15(2):69-76 | DOI: 10.26552/com.C.2013.2.69-76  

Process specifications and working procedures widely used by the aerospace and automotive industries require surface analysis by machining and specify the process parameters such as type, destructive measuring or simulations. Destructive measuring or simulation carried out in order to optimise and later to verify the process parameters are a very indirect way of measurement. While they are performed on simulation only similar in composition and elastic properties to that of the actual part to be machined, they almost never match all the important conditions of the process such as the shape of the real part or the residual stress prior to the treatment....

Intelligent Manufacturing Systems in Concept of Digital Factory

Martin Krajcovic, Vladimir Bulej, Ivan Kuric, Alzbeta Sapietova

Communications - Scientific Letters of the University of Zilina 2013, 15(2):77-87 | DOI: 10.26552/com.C.2013.2.77-87  

This paper deals with selected areas of concept of Zilina Intelligent Manufacturing System (ZIMS), which is developed by the Faculty of Mechanical Engineering in collaboration with CEIT and other faculties of the University of Zilina. Main research areas realized in the framework of ZIMS cover the basic processes in the entire product lifecycle from beginning to end (PLM - Product Lifecycle Management). In this paper two of these areas will be described - manufacturing system design using progressive digital technologies and utilization of automation and robotics in intelligent manufacturing systems.

Determination the Contact Stress Depending on the Load Rate of the NU220 Roller Bearing

Milan Vasko, Ardeshir Guran, Lenka Jakubovicova, Peter Kopas

Communications - Scientific Letters of the University of Zilina 2013, 15(2):88-94 | DOI: 10.26552/com.C.2013.2.88-94  

The purpose of this paper is to present the impact magnitude of the load rate of the roller bearing at mutual slewing of roller bearing rings to the process of contact stresses in rolling element. The roller bearing satisfies prescribed basic static load capacity if it is loaded by the maximum specified load only in the radial direction according to the ISO / TS 16281. The basic static radial load capacity of the cylindrical roller bearing determines the maximum loading for which there is no plastic deformation in the raceways yet. However, the real roller bearings are not loaded only in the radial direction in practice. During operation there exists...

Structural Health Monitoring of Helicopter Fuselage

Robert Hudec, Ladislav Janousek, Miroslav Benco, Pavol Makys, Vladimir Wieser, Martina Zachariasova, Matej Pacha, Vladimir Vavrus, Martin Vestenicky

Communications - Scientific Letters of the University of Zilina 2013, 15(2):95-101 | DOI: 10.26552/com.C.2013.2.95-101  

The helicopter design is a challenging experience for fatigue concern as it is subjected to a very wide range of low- and high-frequency load cycles per flight, much more than a fixed wing aircraft. Structural Health Monitoring (SHM) seems to have capability in helping to reduce the maintenance and operational costs, which are about 25 percent of the direct operating cost of the helicopter, thus playing an important role especially in the case of the ageing helicopters. In fact, the damage tolerant design approach makes the fatigue resistance evaluation not only a safety issue but also a maintenance related concern. The work presented in this paper...

Recent Innovative Solutions in Eddy Current Non-Destructive Diagnosis

Ladislav Janousek, Milan Smetana, Mihai Iulian Rebican, Tatiana Strapacova, Anton Duca, Viera Pernisova

Communications - Scientific Letters of the University of Zilina 2013, 15(2):102-108 | DOI: 10.26552/com.C.2013.2.102-108  

Recent innovative solutions in eddy current non-destructive evaluation of conductive materials are reported in the paper. Two main areas influencing reliability and preciseness of real cracks diagnosis are discussed. Advances in sensor technology are concerned at first. Innovative sensor design allowing sensing all the three spatial components of the perturbation electromagnetic field is presented. A novel approach for automatic diagnosis of real cracks from two-dimensional eddy current response signals is then introduced. The tabu search is applied for the three-dimensional reconstruction of partially conductive cracks.

Oscillatory Properties of the Solutions of First Order Linear Neutral Differential Equations with "Maxima"

Zuzana Malacka

Communications - Scientific Letters of the University of Zilina 2013, 15(2):109-111 | DOI: 10.26552/com.C.2013.2.109-111  

In this paper we consider a neutral differential equation with "maxima" of the form [x(t) + p(t)x(σ(t))] + q(t) max x(s) = 0 We obtained sufficient conditions for oscillation of all the solutions when t→∞.

Optimisation of the Processes of Written Heritage Preservation and Digitisation

Dusan Katuscak, Martin Konvit

Communications - Scientific Letters of the University of Zilina 2013, 15(2):112-117 | DOI: 10.26552/com.C.2013.2.112-117  

The Memory of Slovakia Centre of Excellence (MSCOE) is a project of the University of Zilina, under the scientific and organisational auspices of the Faculty of Humanities implemented from 2010 until 2013. The paper contains information about the project, some outcomes and specialisation of scientific and innovation activities. It describes priorities for research and innovation in the MSCOE, especially optimisation of mass digitisation technology, integrating processes of mass digitisation and conservation of textual materials and optimisation of linguistic solutions in mass digitisation and the best possible preparation of digital content for use.

Versatile, Efficient and Long Wagon for Intermodal Transport in Europe

Peter Fabian, Juraj Gerlici, Jaroslav Masek, Peter Marton

Communications - Scientific Letters of the University of Zilina 2013, 15(2):118-123 | DOI: 10.26552/com.C.2013.2.118-123  

This contribution describes the efforts of the multidisciplinary team of University of Zilina in answering the EC FP7 Call for project proposals FP7-SST-2010-RTD-1 SST.2010.2.1-1: Fast implementation of innovative/effective rail technologies to improve rail freight services. The results of the project "VEL-Wagon - Versatile, Efficient and Long Wagon for Intermodal Transport in Europe", approved under the grant No. 265610 should be a key milestone for the efficiency of intermodal freight wagons, since it demonstrated that fewer elements and less dead weight can result in the same or even better transport output, saving material, energy, environment...

Evaluation of Crash Tests of the Institute of Forensic Engineering, University of Zilina, Aimed at EES

Pavol Kohut, Gustav Kasanicky

Communications - Scientific Letters of the University of Zilina 2013, 15(2):124-130 | DOI: 10.26552/com.C.2013.2.124-130  

For the proper analysis of traffic accidents it is important to properly evaluate the deformation work of a vehicle deformation based on the extent of damage of the vehicle. The Institute of Forensic Engineering, University of Zilina, made a series of vehicles crash tests focused on the evaluation of the vehicle deformation work. The article focuses the on evaluation of the vehicle deformation work or of the EES (energy equivalent speed) and comparison of stiffness tests of cars (production year around 2000) and older generation of vehicles (which were subject of tests - Crash tests DSD LINZ 1996).

Physicochemical Properties of Water Courses in Tatra National Park

Ondrej Gura, Jan Graban, Natalia Maximova, Eva Greguskova

Communications - Scientific Letters of the University of Zilina 2013, 15(2):131-141 | DOI: 10.26552/com.C.2013.2.131-141  

The aim of this study is to present an informative overview of the physicochemical properties of a representative sample of water courses located within Tatra National Park. The water quality of 28 selected water courses was monitored at altitudes from 639 to 2002 m a.s.l. Water temperature, pH, conductivity, concentrations of total dissolved solids, salinity and dissolved oxygen were measured from June to October 2010. The concentration of dissolved oxygen ranged from 5.90 to 16.46 mg/l, conductivity ranged from 5.30 to 282.60 μS/cm and pH averaged 7.25. An inverse relationship was found between nitrate and altitude as well as between conductivity...

Multimedia Textbook: German for Mechanical Engineering

Anna Tomankova, Sona Gallova

Communications - Scientific Letters of the University of Zilina 2013, 15(2):142-148 | DOI: 10.26552/com.C.2013.2.142-148  

In our presentation we would like to inform about the international project DEUMA called "German for Mechanical Engineering". This project was supported by the European Union as part of LEONARDO DA VINCI II program in which 11 partners from 5 countries participated. The aim of the project was to create a multimedia textbook of technical German language that would be designed especially for students of Faculties of Mechanical Engineering as well as for other students of German language with the focus on its use in the field of professional engineering. DEUMA teaching materials are modern multimedia language tools helping to improve professional German...