Communications - Scientific Letters of the University of Zilina, 2002 (vol. 4), issue 1-2
Articles
Location of Transportation Districts at Modeling of Transportation Processes in a Region
Petr Cenek, Jaroslav Janacek, Ludmila Janosikova
Communications - Scientific Letters of the University of Zilina 2002, 4(1):5-9 | DOI: 10.26552/com.C.2002.1-2.5-9 
Transportation planning should frequently work with too many places, where transportation demands arise (dwelling places in a region). That is why it is necessary to reduce the total number of such places in a transportation network on a given number of transportation districts. An algorithm for automatic location of transportation districts is described in the paper. The location of transportation districts can be defined using mathematical model of the uncapacitatedlocation problem, which can be solved using an exact algorithm. Several criteria are proposed according to which an optimal location of transportation districts is calculated. The results...
Public Passenger Transport Service in Regions
Pavel Surovec
Communications - Scientific Letters of the University of Zilina 2002, 4(1):10-17 | DOI: 10.26552/com.C.2002.1-2.10-17
Public passenger transport aim is to provide transport service in a given region to ensure connection for inhabitants in villages and periphery with the center of economic, social, educational and cultural activities. The paper deals with the results of the study "C 519/2/HÚ1/1.6. Public Road Passenger Transport in a solved area". The definition of public passenger transport service has been created using collected land use and transport data from Žilina region. The definition is very important for financing public transport from state, regional governments and communities' budgets because of covering documentary loss probability.
A Model of Integrated Passenger Transport System in a Specific Region
Peter Faith
Communications - Scientific Letters of the University of Zilina 2002, 4(1):18-23 | DOI: 10.26552/com.C.2002.1-2.18-23
Paper reports on basic principles in development of integrated transport systems in the region. It explains reasons why integration of mass passenger transport is necessary, as well as procedures of its realization with presentation of economic, legislative and organizational measures.Everything what IDS brings are new, advanced organizational and economic relationships between subjects which participate in mass passenger transport either as passengers, transport operators, or districts, regions, towns, villages or the state.
Territory Posts and Telecommunications under Investigation
Tatiana Corejova
Communications - Scientific Letters of the University of Zilina 2002, 4(1):24-32 | DOI: 10.26552/com.C.2002.1-2.24-32
The following factors have a significant influence upon the servicing of the area from the aspect of the postal and telecommunication infrastructure and services: increase in demand for postal and telecommunication products, changes in the demand distribution according to particular ways of connection, or change in market shares, environmental influences which represent the continuing tendency of demand transmission after transmission of information from the postal infrastructure to telecommunication infrastructure - from the fixed networks to the mobile networks - devices, and dynamic rise in the Internet market.Besides the technological development,...
Quality and its Measurement in Transportation, Infocommunication and Postal Services
Miroslav Hrnciar
Communications - Scientific Letters of the University of Zilina 2002, 4(1):33-44 | DOI: 10.26552/com.C.2002.1-2.33-44
Transportation, Info-Communication and Postal Services (TICPS) have a special position in the sector of services when taking into consideration the organization and management of processes. The paper describes the common features of services from the quality management point of view and compares the common used criteria in selected types of services. In the paper, the basic approaches to quality measurement in TICPS from customer and organisational points of view are presented as well. The paper is based on the solution and the conclusions of research project 519/2 "The model of a communication service within a territory administration - region".
The Modeling of Transportation and Transport Processes of a Territory Administration Region
Tomas Hollarek, Imrich Molnar, Jozef Palo
Communications - Scientific Letters of the University of Zilina 2002, 4(1):45-60 | DOI: 10.26552/com.C.2002.1-2.45-60
The development of transport caused the rise of complex transport problems, which require the application of transport engineering methods if they are to be solved. The modeling of transportation and transport processes in major territory units is a current problem for the reason of completing the road and motorway networks and considering individual variants of the solution. Recently, new transport planning models have been formulated on the principle of dividing the inhabitants into the groups with similar behavior in the transport process. They are called non-aggregative or individual, and one of the aims of the research project was to test these...
Combined Transport Feasibilities in the Zilina Region
Peter Kacala
Communications - Scientific Letters of the University of Zilina 2002, 4(1):61-65 | DOI: 10.26552/com.C.2002.1-2.61-65
Combined transport is considered to be one of possible ways of solution of the environment in international transport. The region of Žilina has a suitable geographic location, excellent communication possibilities and a sufficient potential for goods transport in combined transport systems. resulting from its geographical position. Improvement of the economic situation and utilisation of logistics in circulation processes create preconditions for building and efficient exploitation of a modern combined transport terminal as a part of freight village.
Higher Territorial Units and Transportation Accessibility of their Centers
Jaroslav Janacek, Ludmila Janosikova
Communications - Scientific Letters of the University of Zilina 2002, 4(1):66-72 | DOI: 10.26552/com.C.2002.1-2.66-72
The paper deals with administration partition of Slovakia in terms of transportation accessibility of higher territorial unit centers. Transportation accessibility is defined as an average distance, which has to be traveled by an inhabitant from his place of residence to the nearest higher territorial unit center. Transport-optimal partition is compared to designs, in which the place of residence of some higher territorial unit center is set beforehand.
The Evaluation of a Selected Part of the Road Network in Zilina Region
Jan Celko, Daniela Durcanska, Jozef Komacka, Eva Holescakova
Communications - Scientific Letters of the University of Zilina 2002, 4(1):73-82 | DOI: 10.26552/com.C.2002.1-2.73-82
Two international corridors "Va" and "VI" pass through Žilina region, but yet the road network density of the region belongs to the lowest in Slovakia. The road network is loaded excessively and main arteries come under a section with a maximum accident rate. The model of the communication attendance of the region that has been solved recently deals with the road network in the region in the terms of the transportation system integration. The paper presents basic characteristics of the network, information on the present state of the traffic, as well as principles of a traffic modelling process. The main resources for improving the traffic situation...
Geometric Relations of the Formation of a Cut Surface
Karol Vasilko, Anna Macurova
Communications - Scientific Letters of the University of Zilina 2002, 4(1):83-87 | DOI: 10.26552/com.C.2002.1-2.83-87
When assessing the roughness of the cut surface a simplified relationship is used representing the dependency of maximum deviation of a roughness and a representing feed in the form Rz 8 f r 2 , where Rz is the roughness of the cut surface, f is a feed and r is a radius of the curving of the knife. The latest approaches illustrate the inaccuracy of this dependency. On the basis of the experimental measurements the authors analyse new relationships between cutting conditions and roughness of the cut surface. These enable to predict morfology of the cut surface to the accession of the semi-product in the production facilities and to select optimal cut...
Selected Problems of Reinforced Soil Mechanics
Marek Kopinski, Andrzej Surowiecki
Communications - Scientific Letters of the University of Zilina 2002, 4(1):88-92 | DOI: 10.26552/com.C.2002.1-2.88-92
Selected problems of the mechanics of a loose soil medium, illustrated with tests of cuboidal specimens loaded with a vertical, static, axial symmetric pressure, have been presented. The specimens were reinforced with inserts (nets) situated horizontally, i.e. perpendicular to the plane of loading. The interaction between reinforced soil components, in particular the influence of soil and reinforcement related factors on the size of an interaction zone, was discussed.An average horizontal stress and an experimental coefficient of lateral pressure were taken into account when assessing the effect of reinforcement on the deformability of soil.
Installation of Soil Pressure Cells in Civil Engineering Structures
L. Grabowski, S. Kobielak, Z. Zamiar, M. Jagiello
Communications - Scientific Letters of the University of Zilina 2002, 4(1):93-102 | DOI: 10.26552/com.C.2002.1-2.93-102
The paper deals with the problem of cells installation encountered with the measuring of soil pressure in different civil engineering structures. In the paper are given application examples of boundary type of pressure cells used to pressure soil measurement acting on boundary surfaces of such civil engineering structures as building foundation, tunnels, shafts, piles and retaining walls as well as embedded type pressure cells apllied to stress record within soil of road or dam embankments. When pressure cells are installed for such measurements suitable installation techniques should be used to minimise ground disturbance in the vicinity of the pressure...
Durability of Polymer Concretes
Katarina Slopkova
Communications - Scientific Letters of the University of Zilina 2002, 4(1):103-109 | DOI: 10.26552/com.C.2002.1-2.103-109
Decrease of the compressive strength and the flexural strength of polymer concretes based on an epoxy resin as a result of repetitive effect of frost, increased temperatures 40 °C and 80 °C and long-term water effect.