Communications - Scientific Letters of the University of Zilina, 2017 (vol. 19), issue 4
Articles
The FEM Application in Numerical Analysis of Slewing Rings Roller/Ball Combination Bearing
Marek Krynke, Piotr Sygut
Communications - Scientific Letters of the University of Zilina 2017, 19(4):3-9 | DOI: 10.26552/com.C.2017.4.3-9 
Slewing bearings are selected based on the characteristics of capacity, which determine the area of the permissible load of the bearing. This capacity of a bearing does not take into account the real operating conditions of a bearing. This implies a necessity to take into consideration all the factors having an influence on the bearing capacity during its determination. The way of determining of the static limiting load curves profiles (static capacity chart) of a double-row roller/ball combination slewing bearing is presented in this article. In the calculations, taking into account flexural-torsional flexibility of bearing rings, flexibility and...
Influence of Repairing Using Welded Steel Patches on Structural Integrity of a High Pressure Gas Pipeline
Jan Kec, Ivo Cerny, Jan Lustinec, Romana Pavelkova
Communications - Scientific Letters of the University of Zilina 2017, 19(4):10-14 | DOI: 10.26552/com.C.2017.4.10-14
The present paper deals with complex material properties of DN 300 pipeline from the section Olesna - Barchov. The work was aimed at experimental verification of the effect of welded-on cover patches on the pipeline integrity. Two types of welded-on cover patches were evaluated. In the first case, just a single patch - steel plate was welded into the pipeline wall, replacing the damaged area. A lack of root fusion was found by means of the NDT. In the second case, the primary patch welded into the wall was covered by an auxiliary patch welded over the first one. No imperfection of the weld integrity was shown in the second case. The experimental programme...
Crystallization Kinetics of Commercial PLA Filament
Adam Balazs
Communications - Scientific Letters of the University of Zilina 2017, 19(4):15-19 | DOI: 10.26552/com.C.2017.4.15-19
The Poly-Lactic Acid (PLA), the often used material for 3D printing and the rapid prototyping is very important in development process in automotive industry, as well. The commercial PLA filament was chosen and isothermal melt-crystallization and melting behavior was investigated by the DSC (differential scanning calorimetry). The PLA is a semi - crystalline biopolymer but the crystallization process is slow and sensitive to the changing of the cooling rate. Avrami equation was applied to analyze the crystallization. Arrhenius equation was used to calculate the activation energy and the equilibrium melting temperature was determined by the Hoffman-Weeks...
Melt Shear Viscosity of Original and Recycled Pet in Wide Range Shear Rate Melt Shear Viscosity
Attila Bata, Gergely Toth, Karoly Belina
Communications - Scientific Letters of the University of Zilina 2017, 19(4):20-23 | DOI: 10.26552/com.C.2017.4.20-23
Among the plastic materials, the PET is the most often used one. Collecting of the material to be recycled is partially solved. This way we have great quantity of regrinded PET. During the regrinding the structure of molecules changes, and these properties can be measured by rheological methods. Polymer melts are-newtonian fluids and the flow curves of the materials can be used to characterize the molecular weight and the molecular weight distribution. This research is focused on the characterization of original and regrinded PET materials. Inherent viscosities (IV) were determined to characterize the materials. Flow curves of pure and blended materials...
Vibration Analysis by the Gabor Transform Method
Jaroslav Smutny, Daniela Vukusicova, Viktor Nohal, Herbert Seelmann
Communications - Scientific Letters of the University of Zilina 2017, 19(4):24-29 | DOI: 10.26552/com.C.2017.4.24-29
This paper deals with description and application of the Gabor transform for vibration analysis. This transform belongs to the group of linear time-frequency processes. Thanks to its properties, it may be successfully used in the area of non-stationary and transitional signals describing various natural processes. Use for analysis of vibrations caused by railway transport represents quite an interesting application area of this transform. This paper contains mathematical analysis of the transform, a case study and practical experience obtained, as well as recommendations for its practical use.
Liability in Autonomous Vehicle Accidents Liability in Autonomous
Krisztian Pinter, Zsolt Szalay, Gabor Vida
Communications - Scientific Letters of the University of Zilina 2017, 19(4):30-35 | DOI: 10.26552/com.C.2017.4.30-35
Nowadays, due to the constant change in the society's expectations regarding transportation, the main area of automotive development is the implementation of autonomous vehicle control functions. While with the gradual introducing and spreading of autonomous functions-even based on the previous experience-the decrease of the number of traffic accidents is expectable, parallel we have to prepare the emergence for the new types of accidents, in which autonomous vehicles will be involved. Needs of follow-up examination and reconstruction of such type accidents makes necessary the general use of the event/accident data recorders in road vehicles and application...
Intelligent Modelling with Alternative Approach: Application of Advanced Artificial Intelligence into Traffic Management
Viliam Lendel, Lucia Pancikova, Lukas Falat, Dusan Marcek
Communications - Scientific Letters of the University of Zilina 2017, 19(4):36-42 | DOI: 10.26552/com.C.2017.4.36-42
The currently existing transport infrastructures are failing due to many problems. This paper deals with presenting a new approach of modelling and forecasting transport processes using artificial intelligence. Firstly, the current state of forecasting transport data is presented; the traditional as well as new artificial intelligence methods, such as artificial neural networks, are discussed and described. After that, a support vector regression prediction model is briefly presented and an empirical analysis is performed. Finally, on the basis of our experiment and performed comparative analysis we state that artificial intelligence (AI) intelligent...
Motivation Level and its Comparison Between Senior Managers and Blue-Collar Workers in Small and Medium-Sized Transport Enterprises
Rudolf Kampf, Silvia Lorincova, Larisa M. Kapustina, Lenka Lizbetinova
Communications - Scientific Letters of the University of Zilina 2017, 19(4):43-49 | DOI: 10.26552/com.C.2017.4.43-49
The aim of the article is to compare the motivation level of senior managers and blue-collar workers in Slovak small and medium-sized enterprises providing transport for forestry sector with the focus on the creation of motivation programs. The analysis included 340 senior managers and 262 blue-collar workers. A total of 30 motivation factors were examined. The most important motivation factors were defined. We identified the significant differences between the needs of senior managers and blue-collar workers by using the Student two-sample t-test. Based on the results of our testing we may conclude that in the field of motivation factors in Slovakia...
Human Capital as a Tool for Predicting Development of Transport and Communications Sector: The Czech Republic Perspective
Dalibor Gottwald, Libor Svadlenka, Pavla Lejskova, Hana Pavlisova
Communications - Scientific Letters of the University of Zilina 2017, 19(4):50-56 | DOI: 10.26552/com.C.2017.4.50-56
Human capital as a part of intellectual capital has crucial impact on the overall development of all sectors of national economy. This trend can also be confirmed by the growing number of academic papers dealing with the issue. This paper presents results of a questionnaire survey that investigated the human capital in terms of selected motivational factors and employability prospects as seen by students of high schools programs related to transport and communications. The main objective was to get an insight into the current situation in the sector and its attractiveness as seen by potential future employees. The questionnaire survey was carried out...
Seasonal Analysis of Total Premiums Written of the Motor Third Party Liability Insurance in The Czech Republic In Years 2000 - 2016 from the Marketing Perspective
Monika Eisenhammerova, Jan Chocholac
Communications - Scientific Letters of the University of Zilina 2017, 19(4):57-63 | DOI: 10.26552/com.C.2017.4.57-63
The insurance sector is in many ways unique, because insurance companies must use specific marketing tools to satisfy their customers and insurance companies have with customer's long-term relationships. Insurance companies must continuously monitor the insurance market, especially type of demand for insurance products and customer requirements. The number of registered vehicles in the Czech Republic is annually increasing, which causes an increase of total premiums written of the motor third party liability insurance and insurance companies must monitor this insurance product and analyse demand for it. The aim of this article is to analyse the seasonality...
Usage of Colors in TV Commercials: Cross-Industry Analysis of Mass Media Communications
Daria Gunina, Tomas Kincl, Sabina Suldova
Communications - Scientific Letters of the University of Zilina 2017, 19(4):64-71 | DOI: 10.26552/com.C.2017.4.64-71
The aim of this study is to analyze the differences in color schemes in TV commercials across different product categories. The study answers the question of whether advertisers in different industries use specific color schemes to promote their company or products in TV commercials and if they follow the general recommendations for using colors in marketing communications. The research sample consists of 200 video adverts proportionally representing the commercials aired in six major product categories in the Czech Republic in 2016. The results indicate there is no statistically significant difference in the usage of colors between the product categories....
New Methods of Designing the Balanced Scorecard Method for Management in Industrial Companies
Roman Kozel, Milan Mikolas, Sarka Vilamova, Petr Ocko
Communications - Scientific Letters of the University of Zilina 2017, 19(4):72-78 | DOI: 10.26552/com.C.2017.4.72-78
The Balanced Scorecard (BSC) is a strategic performance measurement system for enterprises, which allows managers of industrial corporations to measure variables that are based on strategic goals of a company. The issue while creating and implementing the BSC system could lay in a mere copying of its traditional forms without incorporating specific needs of a particular enterprise. This article aims to present the research results of a team of authors that was, in cooperation with managers of selected companies in the Moravian-Silesian region, searching for an answer to a question, whether it is possible to simplify the creation process of the BSC...
The Ethical Aspect of Scientific Interest in Selected Physical Theories
Marian Ambrozy, Michal Valco, Suresh Bhattarai
Communications - Scientific Letters of the University of Zilina 2017, 19(4):79-84 | DOI: 10.26552/com.C.2017.4.79-84
Mainstream physicists do not form a unified group of scientists sharing the same opinions. It is generally known that their opinions on the dispute regarding the very foundations of quantum mechanics between Einstein and Bohr still differ. Many renowned physicists defend Einstein's standpoint. However, the support of Bohr's assertions regarding quantum mechanics by various grant agencies and foundations is also very significant. The present paper compares the two physical theories. In their case, there is basically no correlation with empirical indicators. The paper points out the robustness of the theory of strings and the theory of physical vacuum....
Scientific Ethics and the Pendulum of Dehumanization
Humberto Ortega Villasenor, Alonso S. Ortega Gonzalez
Communications - Scientific Letters of the University of Zilina 2017, 19(4):85-89 | DOI: 10.26552/com.C.2017.4.85-89
The article contends that science is forsaking its core purpose, which is to meet human beings' intrinsic epistemological need to understand the world, know it and explain it fully for specific purposes. On the one hand are the pure scientists, overly concerned with solving their research problems but indifferent to the uses to which their work might be put. Another question is the system itself-companies, corporations and governments-which takes advantage of this negligence or indifference and develops applications or technologies for its own economic or political benefit, instead of meeting real needs of individuals or social groups. Finally, there...
Neuromarketing - An Opportunity or a Threat? Neuromarketing - An Opportunity or a Threat?
Margareta Nadanyiova
Communications - Scientific Letters of the University of Zilina 2017, 19(4):90-94 | DOI: 10.26552/com.C.2017.4.90-94
The reason of neuromarketing use lies in an attempt to understand consumer behaviour and motivation to make a purchase of certain product. This method is based on the assumption that the purchase decisions is largely influenced by emotions. The paper explains the essence of neuromarketing and selected neuromarketing technologies, such as Functional magnetic resonance imaging (FMRI), Electroencephalography (EEG) and Eye tracking. In this way, as a literature review, it provides a comparison of the views of several experts on the issue. An important part of the paper is to analyse the perception of neuromarketing by the professional and general public,...
Communication in French Foreign Language Learning by Implementing the Aspects of Interculturality
Jana Birova, Dinara G. Vasbieva, Alfiya R. Masalimova
Communications - Scientific Letters of the University of Zilina 2017, 19(4):95-104 | DOI: 10.26552/com.C.2017.4.95-104
This research paper examines the case study and the weak sides of the implementation of intercultural education in a FLT class, and then examines how such teaching could be effective. The didactic intervention through which the native teacher was reflexive was done in two stages in order to recover all the didactic aspects necessary for a successful implementation in the future.
Forensics Aware Lossless Compression of CAN Traffic Logs
Andras Gazdag, Levente Buttyan, Zsolt Szalay
Communications - Scientific Letters of the University of Zilina 2017, 19(4):105-110 | DOI: 10.26552/com.C.2017.4.105-110
In this paper, we propose a compression method that allows for the efficient storage of large amounts of CAN traffic data, which is needed for the forensic investigations of accidents caused by the cyber-attacks on vehicles. Compression of recorded CAN traffic also reduces the time (or bandwidth) needed to off-load that data from the vehicle. In addition, our compression method allows analysts to perform log analysis on the compressed data. It is shown that the proposed compression format is a powerful tool to find traces of a cyber-attack. We achieve this by performing semantic compression on the CAN traffic logs, rather than the simple syntactic...
Unique Police Training Polygon in Terms of Activity and Training Improvement of the Intervention Units of the Police of the Czech Republic
Martin Hrinko
Communications - Scientific Letters of the University of Zilina 2017, 19(4):111-116 | DOI: 10.26552/com.C.2017.4.111-116
The report describes project works and the purpose of a special training polygon designated for police officers of intervention units of the Police of the Czech Republic. It is a completely unique training facility newly built for the law enforcement officers. It concerns the outstanding project in conditions of the Police of the Czech Republic, which contains extreme situations and conditions which police officers of intervention and special units can meet in their practical performance of service. In the limited extend this applies also for the training of tactics for members of firstly coming patrols and emergency units.
Augmented Reality in Engineering Education: Opportunities and Advantages
Aleksandr Nesterov, Ivan Kholodilin, Aleksandr Shishkov, Pavel Vanin
Communications - Scientific Letters of the University of Zilina 2017, 19(4):117-120 | DOI: 10.26552/com.C.2017.4.117-120
The article is dedicated to the study of the possibility of applying augmented reality technologies in the field of engineering education. The prerequisites for creation and development of Industry 4.0 are considered. The study considers the concept and the technology of augmented reality. The ground of relevance and timeliness of its application in the professional training education process of engineers from different industrial departments is given. The problems of engineering education are reflected. The modern tendencies of engineering education development are considered. The methods of augmented reality technology application in support for...