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The aim of the experiment is to evaluate an effect of industrially used plasma sprayed coatings of the TBC on the heat transfer into the refractory material designed for aeronautical applications. This study uses basic structural material of combustion chambers — components of turbine engines highly thermally stressed during the operation by flow of hot gasses. Using the hot gasses from the gas burner,...
This paper deals with hybrid modelling and control of cyber-physical systems, which are part of a recently introduced phenomenon Industry 4.0. As a case study we look at a hydraulic system with hybrid dynamics represented by coupled tanks. The dynamical system contains two discrete modes, specifically with and without interaction. The nonlinear hybrid system was modelled using s-functions and then...
Systems with time-delay are a specific group of dynamic systems. There occurs the time lag of the signal, information or material, which results in the deterioration of the properties of a control circuit if we want to control of such system. The presence of time-delay complicates the synthesis of a control circuit and therefore it is necessary to these systems was described by the differential equations...
Network security is often neglected even by users. This paper deals with user authentication in a network environment and offers analysis of this topic and possibilities how to increase its security by cryptographic methods. A synthetic part provides a detailed description of the design of a simple web application to authenticate users with protection against selected attacks and also its practical...
Maintenance is a very important part of an organization management. It significantly helps to reduce the costs and fault times of the equipment. We developed an app for mobile devices on Android platform, which efficiently enables to apply a methodology of maintenance management classification in industrial practice (maintenance performance audit). Its aim is to assist with the maintenance management...
In the paper the authors focus on models construction of transport scenarios with orientation to security analysis of C2C communications. In the practical part two transport scenarios are analysed on a sample of real captured transport data via Riverbed Modeler tool. The computational complexity of ECDSA digital signature schemes was determined according to several selected EC curves and the efficiency...
The paper describes similarity detection method for language independent source code similarity detection. It is based on idea of maximum reusability of standard Unix filters. This method was implemented and benchmarked with different datasets from real world (students' assignments) and also synthetic datasets (perfect plagiarism experiment). Our method achieved significantly better results than competitors,...
In this paper we applied the krill herd algorithm hybridized with the firefly algorithm to bound-constrained large-scale optimization problems. We tested basic krill herd algorithm and basic firefly algorithm on the standard set of benchmark functions. The results were acceptable. Then, we hybridized the krill herd algorithm with the firefly algorithm by applying firefly algorithm's search equation...
This paper presents the model of the navigation component of the ILONA System, which is a flexible indoor positioning framework. Navigation in closed environment is a vital part of indoor location based services. The unique properties and the topology of the indoor environments limits the usage of existing global navigation solutions. On the other hand, room-level indoor navigation can be traced back...
Leaf recognition is convenient for plant classification and it is an important subfield of pattern recognition. Different leaf features such as color, shape and texture are used as well as different classifiers including artificial neural networks, k-nearest neighbor and support vector machines. In this paper we propose an algorithm based on tuned support vector machine as a classifier and Hu moments...
This article focuses on the business analytics and data analysis by application of the advanced tools, technologies and methods of Business Intelligence (BI). These tools enable companies to gain competitive advantage and improve their processes. We had data from the biggest steel factory in Slovakia. In papers [1], [2] we worked with BI solutions and there was request that all reports have to be...
As quadriplegia patients lost the ability to control the upper and lower limbs due to upper spinal cord injury, they need an intelligent control system to use a traditional electric wheelchair, which is driven normally by a joystick controller. One of the successful control systems for this kind of user is the use of head tilts as a controller. It allows the quadriplegia patient to drive the rehabilitation...
Oil for electricity generation, burning of coal, heat production is the largest sources of greenhouse emission that cause climate change worldwide. Therefore the diffusion of solar PV technologies has become a crucial component for both climate change mitigation and adaptation of the electrical system on a global scale. In this survey, we analyzed the state of the art of the present large scale Photovoltaic...
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