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Ostrava, Czech Republic

The Technical University of Ostrava is a university located in the city of Ostrava, Moravian-Silesian Region, Czech Republic. The institution was founded on 23 January 1849 as the Mining Academy in Příbram. In 1894 it was promoted to university status and in 1904 it was renamed to Vysoká škola báňská. In 1945 it was moved to Ostrava, then the centre of Czechoslovak mining industry.Today the university has a total of about 20,000 students and consists of the following seven faculties: Faculty of Economics Faculty of Civil Engineering Faculty of Mechanical Engineering Faculty of Electrical Engineering and Computer Science Faculty of Mining and Geology Faculty of Metallurgy and Material Engineering Faculty of Safety Engineering Wikipedia.

Cajka R.,VSB - Technical University of Ostrava
Applied Mechanics and Materials

In case of constructions placed on subsoil, it is necessary to create a rigidity matrix for the element subsoil. That rigidity matrix should be then added up in respective positions with the rigidity matrix of an element. To clarify the proposed model of the subsoil, a method is derived for determination of vertical subsoil stress analysis under any shape of a slab construction by means of numerical integration and theory of isoparametric elements using the Jacobian transformation. This approach is rather original and represents the key contribution of this work in interaction solutions. Using the proposed approach, the method can be employed for any shape of a finite element. © (2013) Trans Tech Publications, Switzerland. Source

Zelinka I.,VSB - Technical University of Ostrava
Swarm and Evolutionary Computation

Swarm and evolutionary based algorithms represent a class of search methods that can be used for solving optimization problems. They mimic natural principles of evolution and swarm based societies like ants, bees, by employing a population-based approach in mutual communication and information sharing and processing, including randomness. In this paper, history of swarm and evolutionary algorithms are discussed in general as well as their dynamics, structure and behavior. The core of this paper is an overview of an alternative way how dynamics of arbitrary swarm and evolutionary algorithms can be visualized, analyzed and controlled. Also selected representative applications are discussed at the end. Both subtopics are based on interdisciplinary intersection of two interesting research areas: swarm and evolutionary algorithms and complex dynamics of nonlinear systems that usually exhibit very complex behavior. © 2015 Elsevier B.V. All rights reserved. Source

Toloo M.,VSB - Technical University of Ostrava
Measurement: Journal of the International Measurement Confederation

Data envelopment analysis (DEA) has been a very popular method for measuring and benchmarking relative efficiency of each decision making units (DMUs) with multiple inputs and multiple outputs. DEA and Discriminant Analysis (DA) are similar in classifying units to exhibit either good or poor performance. On the other hand, selecting the most efficient unit between several efficient ones is one of the main issues in multi-criteria decision making (MCDM). Some proponents have suggested some approaches and claimed their methodologies involve discriminating power to determine the most efficient DMU without explicit input. This paper focuses on the weakness of a recent methodology of these approaches and to avoid this drawback presents a mixed integer programming (MIP) approach. To illustrate this drawback and compare discriminating power of the recent methodology to our new approach, a real data set containing 40 professional tennis players is utilized. © 2013 Elsevier Ltd. All rights reserved. Source

Bris R.,VSB - Technical University of Ostrava
Reliability Engineering and System Safety

When a system is composed of highly reliable elements, exact reliability quantification may be problematic, because computer accuracy is limited. Inaccuracy can be due to different aspects. For example, an error may be made when subtracting two numbers that are very close to each other, or at the process of summation of many very different numbers, etc. The basic objective of this paper is to find a procedure, which eliminates errors made by PC when calculations close to an error limit are executed. Highly reliable system is represented by the use of directed acyclic graph which is composed from terminal nodes, i.e. highly reliable input elements, internal nodes representing subsystems and edges that bind all of these nodes. Three admissible unavailability models of terminal nodes are introduced, including both corrective and preventive maintenance. The algorithm for exact unavailability calculation of terminal nodes is based on merits of a high-performance language for technical computing MATLAB. System unavailability quantification procedure applied to a graph structure, which considers both independent and dependent (i.e. repeatedly occurring) terminal nodes is based on combinatorial principle. This principle requires summation of a lot of very different non-negative numbers, which may be a source of an inaccuracy. That is why another algorithm for exact summation of such numbers is designed in the paper. The summation procedure uses benefits from a special number system with the base represented by the value 232. Computational efficiency of the new computing methodology is compared with advanced simulation software. Various calculations on systems from references are performed to emphasize merits of the methodology. © 2010 Elsevier Ltd. All rights reserved. Source

Mynarcik P.,VSB - Technical University of Ostrava
Procedia Engineering

Concrete industrial floors must fulfill a number of very specific requirements - adequate flatness, limited cracking and especially sufficient loads capacity. Any break of the requirements and the subsequent failure of the floor structure, would cause difficult repairs and expensive unplanned shutdowns. The main theme of this paper is focused on concrete industrial floors designed primarily for middle and severe operating conditions. The first part describes the actual trends and contemporary technology. The second part is focused on technology of prestressed industrial floors - their possibility of use, advantages, disadvantages and application in the Czech Republic and abroad. © 2013 The Authors. Published by Elsevier Ltd. Source

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