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Smart phones by now have overwhelmed the mobile phone market, to the point that it becomes increasingly difficult to find an “old-type”, classical, feature phone. Although they offer a wealth of features and services to their users, they are far more power hungry, requiring to be charged almost daily! At the same time many interesting questions arise, in regards to their users: Are they aware of green...
This paper deals with the problem of designing the optimal structure of a public service system. The problem can be often formulated as a p-median location problem. Solving the p-median location problem in the public service system design is NP-hard problem. Real instances of the problem are characterized by big number of possible service center locations, which can take the value of several hundreds...
The combinations of low probability events (hardware and software faults, anomalous nature events, human operator errors) cause the infrastructure accidents and disruptions. There are different approaches for evaluation of human operator's reliability. Multi-factor analysis is the essential step for obtaining the trustworthiness estimations of infrastructure's safety. The application of Bayesian Belief...
One of the main problems in reliability assessment of a complex dynamic system is to take into account dependencies of the system structure resulting from changes of its physical parameters. The aim of this paper is to provide the mathematical model of actual natural gas compression station which is situated in the Czech Republic. The Czech Republic represents one of the European transit countries...
The problem of modeling blood flow can be approached on different levels of accuracy. We investigate a model consisting of two major components: the fluid representing blood plasma and the elastic objects representing all types of cells in blood, e.g. red blood cells. The elastic objects are immersed in the fluid and they interact with each other. Our research is focused on spring-network models of...
We expect that WebRTC will experience high adoption rate as a peer-to-peer realtime communication standard for browsers. WebRTC allows direct media and data transport between browsers without having to go through a web server. In this study, we use a black-box testing technique to evaluate, via PESQ, the voice quality of WebRTC sessions under varying network delay and jitter. Network emulators are...
The goal of this conference paper is to give information about the problematics of primary computer and information literacy among pupils attending elementary school. Furthermore the paper describes a process of making and evaluating of an accomplished survey which aim was to analyze a present state of primary computer and information literacy by a form of questionnaire. Literacy as a concept is described...
This paper concerns the effect of configuration of high voltage power cables on induced voltages in their metallic sheaths. One, two or three cables per phase and phase sequence of the cables are considered. Computing of the voltages was performed for a normal operation and in case of earth fault. Various ways of the sheaths bonding are considered as well. Shock hazard and voltage stress of non-metallic...
Several methods, tools and measures have been developed which highlight the questions about the power systems reliability each from its particular viewpoint. The objective is to review the selected methods in the field of electric power system reliability keeping in mind the complexity of the system and its features. Their review is performed in sense of applicability to conventional sources of energy...
WiFi is one of the most popular wireless standard today. However its popularity is killing itself. The number of local networks dramatically arises and as results one can achieve much worse parameters then expected if taking into accounts the devices and different 802.11 standards specifications. One of the main reasons is interference. The authors test two real networks and make an optimisation of...
This paper is dedicated to a problem of the hidden faults associated with development of the computer systems in form of their transformation into safety-related instrumentation and control systems. The hidden faults do not allow ensuring functional safety by construction of fault tolerant digital component without consideration of their checkability. Increase of checkability by imitation of accident...
With an estimated 50 billion internet-enabled devices deployed by 2020, the arrival of the Internet of Things (IoT) or Internet of Everything (IoE) raises many questions regarding the suitability and adaptability of current computer security standards to provide privacy, data integrity and end entity authentication between communicating peers. In this paper we present a new protocol which combines...
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