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Results 361 to 390 of 459:

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.

Analyses of the Causes of Common Rail Piezoelectric and Electromagnetic Injectors' Premature Destruction in Self-Ignition Engines

Slawomir Olszowski, Jozef Buday, Jozef Kuchta, Jan Michalik

Communications - Scientific Letters of the University of Zilina 2013, 15(3):79-82 | DOI: 10.26552/com.C.2013.3.79-82

In self-ignition engines with Common Rail direct fuel injection, premature destruction of injectors has been observed. New elements are also touched by the problem. In order to solve it, a group of international experts in the area have gathered. Destroyed piezoelectric and electromagnetic injectors' elements of BOSCH, DELPHI, DENSO, have been examined. Mechanical damages influencing electronic diagnostic signal have been presented. Some system solutions possible to perform as far as diagnostic prevention is concerned have been described. Some useful electronic diagnostic methods of fuel system, signal analysers: RMOG and ERDIA PRO, have been presented.

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 of security and safety. One of the key problems of the education is disparity between the knowledge received from educational institutions and the practical requirements. It is necessary to redefine how students are prepared for the challenges of the labour market: identifying competencies that are currently indemand and how it would be possible to link the educational systems of various institutions more efficiently. The aim of the eSEC project was to develop the competencies of students, teachers, researchers and professionals working in the field of security and safety, within the EU and the world. To achieve these objectives, an electronic portal was developed at www.esecportal.eu. The portal was launched in May 2012, hopefully starting the way to become an established and well known Internet portal on the security and safety education.

Optical, Wired and Wireless Multimedia Service Access Solutions for Trend Setting Real Estates

Peter Mandl, P. Schrotter, E. Leitgeb

Communications - Scientific Letters of the University of Zilina 2008, 10(4):64-71 | DOI: 10.26552/com.C.2008.4.64-71

It is a well known fact that the value of real estates is raised tremendously by its connection to information technology services like Voice over IP (VoIP), IPTV, Video on Demand (VoD), basic Internet services and house-, security- and surveillance technologies. This paper will focus on different state of art methods to connect a real estate to the above mentioned services and will also discuss various inhouse cabling systems and related devices. Advantages and disadvantages between the miscellaneous combinations will be discussed.

Complex Automated Information System for Remote Management of Crisis Situations in Rail Transport

Zdenek Dvorak, Maria Luskova, Petr Hruza, Radovan Sousek

Communications - Scientific Letters of the University of Zilina 2013, 15(3):83-88 | DOI: 10.26552/com.C.2013.3.83-88

The paper deals with topical information from the area of crisis information support. The contributing authors work at three co-operating universities where the subject of transport support in crises is tackled. At present the electronic support of crisis management in transport is necessary prerequisite for the functioning of transport system under both common and emergency situations. The outcomes of scientific research projects are new even from a broader European perspective. The preparation of complex automated information system for remote management of crisis situations in rail transport is new and has not been published yet. The outcomes of extensive analysis, gradually developed methodologies and data sets are presented in the paper together with the current outcomes regarding the electronic support of crisis management in transport.

Executive Dashboard Systems for Emergency Management

Adam Zagorecki, Jozef Ristvej, Louis K. Comfort, Tomas Lovecek

Communications - Scientific Letters of the University of Zilina 2012, 14(2):82-89 | DOI: 10.26552/com.C.2012.2.82-89

The executive dashboard systems are a mainstream business intelligence technology. The main idea behind the executive dashboard systems is to deliver information about status of the organization by means of simple, abstract measures of performance and intuitive visualizations. One of the key concerns is preventing information overload. This is achieved by identifying key performance indicators - a set of measures that summarize the key aspects of the organization's performance. This paper investigates the application of the concept of the executive dashboard systems to the context of public emergency management. We identify the key differences between development of executive dashboard systems for profit-oriented organizations and for the multi-organizational network of the public emergency-management organizations. Based on these differences we deliver a set of implementation guidelines.

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 analysis and knowledge biographies of enterprises resulted into finding that knowledge is the most strategic "material"; learning is a critical process for maintaining competitiveness of enterprises and that relevant aspects together create key mechanism for regional differentiation.

A Comparative Study of Coverage Estimation and Quality of Service for DVB-H Urban Networks Using a Specialized RF Planning Software

Zafirios S. Pantelis, Stavros A. Kotsopoulos

Communications - Scientific Letters of the University of Zilina 2008, 10(4):23-28 | DOI: 10.26552/com.C.2008.4.23-28

The Digital Video Broadcasting - Handheld (DVB-H) standard is the ETSI standard for delivering broadcasting services of high data rates to handheld devices, under high mobility conditions. This paper will compare the different modulation techniques used by the DVB-H standard from the coverage point of view. The coverage estimation simulations have been made with a specialized RF planning tool using real Geographic Data for the metropolitan region of Athens. Thus, we will present a comparative study, of various planning factors like coverage percentage and location probability and compare them for the different modulation schemes used.

Public Relations and Journalism

Slavka Pitonakova

Communications - Scientific Letters of the University of Zilina 2012, 14(1):49-54 | DOI: 10.26552/com.C.2012.1.49-54

The paper offers the findings of possible interconnection between journalism and public relations. It was created as a reaction to the need to explore the level of influence (and impact) of public relations worker on journalism. This need was accompanied by the attempt to look into the issue both from the aspects of journalist and public relations worker. We focused on the exploration of media environment (in relation to media market) with respect to possibilities of being influenced by marketing, specifically by the area of public relations.

Use of Digital Cultural and Scientific Content in Education - A Research Project under the "Memory of Slovakia" Centre Of Excellence

Martin Katuscak

Communications - Scientific Letters of the University of Zilina 2012, 14(1):73-75 | DOI: 10.26552/com.C.2012.1.73-75

The paper deals with a sub-project of the Memory of Slovakia research and development project focused on cultural heritage related to Slovakia and preserved in Slovak memory and heritage institutions, and its preservation and use by numerous types of users, especially in new contexts of digital media based education in primary and secondary schools of the Slovak Republic.

Computability of the Emergency Service System Design Problem

Jaroslav Janacek, Ludmila Janosikova

Communications - Scientific Letters of the University of Zilina 2008, 10(2):5-9 | DOI: 10.26552/com.C.2008.2.5-9

The paper deals with emergency medical system design using methods of mathematical programming. The problem consists in optimal location of stations, where ambulance vehicles should be placed. Several possible objective functions are discussed and the relevant mathematical programming models are presented. The comparison of the solutions is reported based on the computational experiments in the conditions of the Slovak Republic.

Environmental Risk Regulation in the Environmental Protection Law of the Republic of Slovenia

Bojan Ticar

Communications - Scientific Letters of the University of Zilina 2011, 13(2):104-108 | DOI: 10.26552/com.C.2011.2.104-108

The purpose of this paper is to present an overview of the regulation of environmental protection in force in administrative law in the Republic of Slovenia. The author analyses basic environmental protection principles which are contained in the EU regulation. These principles are: (1) the precautionary principle (le principe de précaution, der Grundsatz der Vorsorge), (2) the principle of preventive action (le principe d'action préventive, der Grundsatz der Vorbeugung), (3) the principle of correction at source (le principe de correction à la source, der Grundsatz, Umweltbeeinträchtigungen mit Vorrang an ihrem Ursprung zu bekämpfen), and (4) the polluter pays principle (le principe de pollueurpayeur, das Verursacherprinzip).In order to accede to the EU, the Republic of Slovenia in Article 3a of the Constitution of the Republic of Slovenia allowed the supremacy of the primary legislation of the EU over Slovenian national regulations. The above-mentioned principles of the EC Treaty are transposed into the legal system of the Republic of Slovenia by means of its environmental legislation and implementing regulations. In this paper the author analyses the public law regulation contained primarily in the Environmental Protection Act (Official Gazette RS, Nos. 39/2006, 20/2006, and 70/2008). In addition to the general regulation implemented already by the Environmental Protection Act of 2006, the last amendment to the Environmental Protection Act transposed into the Slovenian legal order the provisions of Directive 2004/35/CE of the European Parliament and of the Council of 21 April 2004 on environmental liability with regard to the prevention and remedying of environmental damage.The paper focuses on the administrative legal regulation of the prevention and reduction of burdens on the environment, the conservation and improvement of the quality of the environment, the remedying of the consequences of burdens on the environment, as well as the improvement of the disrupted natural equilibrium and the recovery of its regenerative capacity. The paper furthermore analyses the application of the Environmental Protection Act as a general substantive law, as well as the special application of the procedures provided for in the Environmental Protection Act against subsidiary regulation of general administrative procedures in cases in which public and private interests are in collision or in potential collision.

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.

Emergency Reporting Procedure in a Multi-National Environment

Frantisek Salenka, Dusana Salenka, Marian Furi

Communications - Scientific Letters of the University of Zilina 2011, 13(2):109-113 | DOI: 10.26552/com.C.2011.2.109-113

This article is aimed on reporting procedure in emergency situation used in multi-national environment. It is based on real procedures, documents and instructions, which are usually used in all kinds of emergency assets, especially during the activities of multi-national joint forces. The first impulse for creating this procedure started in armed task forces and due to the great effect fluently increased to the civilian sector. The article is a basic instruction how to simply ensure information flowchart among all the elements and secure quick reaction on developing crisis situation.

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.

Company in Crisis

Lucia Vrablova, Milan Gregor

Communications - Scientific Letters of the University of Zilina 2011, 13(4):78-81 | DOI: 10.26552/com.C.2011.4.78-81

This paper deals with corporate crisis. It draws attention to the failing firm strategy in times of crisis. The corporate crisis is an important part of business life cycle. Proper crisis management is necessary for the survival of a competitive fight and staying on the market.

Radio Map Framework for GSM Positioning

Peter Brida, Jozef Benikovsky

Communications - Scientific Letters of the University of Zilina 2009, 11(4):24-27 | DOI: 10.26552/com.C.2009.4.24-27

This paper introduces radio map framework for creation of GSM (Global System for Mobile communications) network radio maps. These radio maps are structured in the way that they can be utilized later on as a data source for fingerprinting-based localization methods. Attributes of fingerprinting localization method as well as particular radio signal parameters are explained. The framework handles data measurement, data transfer and data visualization scenarios. Data are basically various radio signal parameters coupled with position coordinates. These data make up a database, which allows centralized storage and opens a path to service-oriented localization architecture in the future. Visualization provides means to verify radio map quality, distribution and density in perceptible and user friendly way as well as means to present and publish achieved results. Entire system is aimed to provide usability by multiple users and further optimization. Centralization allows easy implementation of changes and system maintenance at one place.

Implementation Principles of the Project Management by a Security Systems Design

Josef Reitspis, Gabriela Kormancova

Communications - Scientific Letters of the University of Zilina 2008, 10(1):45-48 | DOI: 10.26552/com.C.2008.1.45-48

The project management includes acomplicated complex of activities. An important component of these activities is technical use of software for the support of project management and the management of the object, service (or their combination), which are outputs of the project. The important group of the activities creates the management of the cost with the accent on complex project efficiency. The next activities are connected with the management of the processes in the time, their coordination and their following communication among various participants of the project. There are many specialized activities in the life-cycle of the project, and for this reason the project manager must have abroad and complex area of special knowledge. He should improve not only in the area of his competences and skills but also in the area in which he works (in various economic areas or in the security area).

Multimedia Quality as Perceived by the User

Jean-Yves Monfort, Klemens P. F. Adler, Hans-Wilhelm Gierlich, Joachim Pomy

Communications - Scientific Letters of the University of Zilina 2008, 10(4):5-10 | DOI: 10.26552/com.C.2008.4.5-10

End-to-end voice quality as perceived by the user has always been of major concern to ETSI, the European Telecommunications Standards Institute and its Technical Committee STQ (Speech processing, Transmission and Quality aspects). Recent developments in telecommunications increasingly promote the introduction of new services, including wideband speech communication and multimedia. At the same advent the global telecommunication landscape is undergoing dramatic changes, such as the migration from traditional public network operators to internet (or NGN) service providers.This paper provides an insight into ETSI's activities for end-to-end multimedia quality for NGN - which is a promotional factor for the market. In a multi-vendor environment with quality not being regulated, standards are the only means to achieve reasonable end-to-end multimedia quality.There will be a huge demand for wideband speech communication and multimedia in hands-free, mobile, nomadic and video phone applications in the near future. Devices designed for such applications will have to rely on non-linear and time variant signal processing in order to be capable of providing speech quality that satisfies users' demands. Therefore, it is essential to develop state-of-the-art requirements and test methodologies and to standardize them.

Microstructural Material Analysis of Superalloy Inconel 792-5A after High Temperature Exposition

Zdenek Jonsta, Petr Jonsta, Karel Mazanec

Communications - Scientific Letters of the University of Zilina 2009, 11(1):34-38 | DOI: 10.26552/com.C.2009.1.34-38

Aerospace industry often uses nickel superalloys for blades of jet engine turbines. The reason is that this material can satisfy numerous extreme requirements, such e.g. strength even at very high temperatures, resistance to fatigue damage, resistance to fatigue effect of combustion gases, etc. Long-term service life and material reliability is directly linked to its microstructure, or with its stability at long-term exploitation. Presented article deals with analysis microstructural material characteristics of cast variants nickel superalloy of INCONEL 792-5A type. Several strengthening mechanisms are applied in this type of superalloy. Principal mechanism is precipitation strengthening by coherent precipitates of intermetallic phase Ni3Ti, or Ni3(Ti,Al).The analysis as such is based on evaluation of microstructural parameters by application of electron microscopy and chemical microanalysis.

Standardization Paths for NGN IMS-Based Architecture

Tatiana Kovacikova, Pavol Segec, Michal Bruncko

Communications - Scientific Letters of the University of Zilina 2008, 10(4):15-18 | DOI: 10.26552/com.C.2008.4.15-18

Thanks to the rapid development of technology and increased availability of bandwidth, today more than ever, multiple services such as voice, video and data can be integrated and efficiently carried over a single infrastructure based on a packet network. An NGN (Next Generation Network) is able to deploy those services independently from underlying transport-related technologies, giving fixed or mobile users an access to different providers with the adequate QoS and security. In fact, it is the IMS (IP Multimedia Subsystem) inside the NGN that enables and drives efficient converged service offerings. IMS provides the framework for a common service and session control layer standardized on IP, with SIP controlling all media sessions. The IMS standardization breaks down all the functions necessary to support multimedia applications and to provide standardized (open) interfaces towards application servers enabling enhanced premium services as well as the interworking with other (legacy) networks such as the PSTN/PLMN (Public Switched Telephone Network/Public Land Mobile Network. The paper is describing the current state of the art in the NGN standardization within the ETSI and related standardization bodies.

The First Application of The Electrodynamic Wagon Retarder in Poland

Jerzy Mikulski, Jakub Mlynczak

Communications - Scientific Letters of the University of Zilina 2011, 13(11):114-118 | DOI: 10.26552/com.C.2011.2A.114-118

The article discusses design and installation method of the EDG Electrodynamic Wagon Retarder at the railway siding of the Power Plant Rybnik. It is the first structure of its kind in Poland. Up to now mostly hydraulic brakes have been used in Poland. They were difficult to operate and hardly environmentally friendly due to contamination and noise. Electrodynamic wagon retarders are free from such defects. The issue of introducing new railroad brake construction in Poland is very important because the Polish Railway Lines (PLK) are confronted with the need of devices modernization on a humps. The German railways' experience confirms the effectiveness of this type of brake. Especially the field tests in Germany and Poland show that the electrodynamic retarders do not have a negative impact on the occupancy control system.

Assessment and Management of Level Crossing Risks

Iva Zitnikova, Lenka Malerova, Rene Pribyl, Michal Schwarz, Ales Bernatik, Lenka Kopecka

Communications - Scientific Letters of the University of Zilina 2011, 13(2):78-82 | DOI: 10.26552/com.C.2011.2.78-82

The goal of the project "Assessment and Management of Level Crossing Risks" was to make a comprehensive analysis of safety of level crossings in the Moravian-Silesian Region. The project is divided into several phases including technical and legislative aspects as well as issues of human factor affecting the occurrence of incidents related to level crossings. In individual chapters, results of questionnaire survey concerning the given problems are processed, the analysis of level crossing risks is made and measures to reduce the risks associated with level crossing traffic are proposed.

Determination of Temperature Conditions for a Design of Engineering Constructions during a Fire

Petr Kucera, Jiri Pokorny

Communications - Scientific Letters of the University of Zilina 2011, 13(2):83-87 | DOI: 10.26552/com.C.2011.2.83-87

The problem of an engineering constructions design for effects of fire results from contemporary knowledge and procedures used in technical practice, however, is not limited only to norm recommendations, but looks also for other suitable methods of design. To examine fire endurance of engineering constructions by computation it is necessary to perform the determination of temperature in the area through models for follow-up thermal analysis. This article therefore presents principles of choice of appropriate design fire scenario by determination of the whole conception of safety and then presents a valiant solution of determination of the thermal action though the design fire by the form divergent from norm procedures. In addition, in the text it is alerted to deficiency and limitation in work used norm principles.

Submission to CAC

Peter Kvackaj, Ivan Baronak

Communications - Scientific Letters of the University of Zilina 2004, 6(4):80-83 | DOI: 10.26552/com.C.2004.4.80-83

Asynchronous transfer mode (ATM) is the base for future telecommunication network. The greatly variable requirements for different applications, especially in video and data traffic, make high demands on the development of traffic control in ATM networks. Speaking about Quality of Service (QoS), in ATM there is a traffic control mechanism, which ensures the standard requested by a new application or service. In the following paper an introduction to traffic control mechanism in ATM known as a connection admission control (CAC) and appropriate CAC method are presented.

Preventive Measures and Actions of the Police of the Czech Republic against Urban Violence

Martin Hrinko

Communications - Scientific Letters of the University of Zilina 2011, 13(3):91-95 | DOI: 10.26552/com.C.2011.3.91-95

The following article addresses the current problem of urban violence. The aim of the article is to outline the different preventive measures and actions of the Police of the Czech Republic taken in order to prevent urban violence. Moreover, various ways of documentation of illegal acts are presented. Having been the officer in charge during operations conducted against urban violence, the author also shares his practical experience.

Problems and Key Factors of CRM Implementation

Viliam Lendel

Communications - Scientific Letters of the University of Zilina 2009, 11(4):56-60 | DOI: 10.26552/com.C.2009.4.56-60

CRM value chain identifies five key steps in the development and implementation of a CRM strategy: customer portfolio analysis, customer intimacy, network development, value proposition development, and manage customer life cycle. These five primary stages of the CRM value chain represent three main sequential phases of CRM strategy: analysis, resource development and implementation. This article deals with CRM value chain and diagnostics of the level of Slovak companies in the CRM area.

Human Factor Position in Rise and Demonstration of Accidents

Katarina Zanicka Holla, Valeria Moricova

Communications - Scientific Letters of the University of Zilina 2011, 13(2):49-52 | DOI: 10.26552/com.C.2011.2.49-52

This article deals with the human being - the human factor and its participation in the rise of industrial disasters (hazard - human error), in preventing their rise (hero - intrepid recoveries) and the way how the accidents affect the people in the form of impacts (victim - accident impact). It is necessary to emphasize also another role of the human factor in the rise of accidents - the solver who takes a share in coping with and managing the disaster, the so called crisis manager who will not be the object of this article. A common feature of all three groups is the psyche of the human factor (personality) and the specific is represented by the different going through and behaving of people during the rise and the course of the accident.

Simulation of a Power Substation's Control System Operation

Marek Hoger, Peter Bracinik, Marek Roch

Communications - Scientific Letters of the University of Zilina 2011, 13(11):44-48 | DOI: 10.26552/com.C.2011.2A.44-48

This paper describes a simulator of power substation automation system developed as part of software suit for complex simulation of power substation operation. This software simulates behavior of a distributed control system built from a group of interconnected and cooperating intelligent electronic devices. The basic structure and communication principles are derived from standard IEC 61850.

Information Systems for Crisis Management - Current Applications and Future Directions

Jozef Ristvej, Adam Zagorecki

Communications - Scientific Letters of the University of Zilina 2011, 13(2):59-63 | DOI: 10.26552/com.C.2011.2.59-63

The management of crisis situations is undergoing rapid changes due to advances of Information Technology. We discuss the role of information systems in supporting decision making processes in crisis management. The crisis management poses particular challenges for information systems - it is characterized by dynamic, complex environments involving many actors in often very unique and extreme situations. We review the roles, benefits and challenges of information systems' application to different phases of the crisis management. We argue that for the different phases of the crisis management, the different types of information systems varying in the aspects such as use scenarios, user requirements, critical technologies, etc. are suitable. Finally, we outline the directions for future research and applications for the field of the support systems for the emergency management.

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