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Fuzzy Markov chains and their use in risk management
Šindelková, Petra ; Vymazal, Tomáš (referee) ; Misák, Petr (advisor)
This thesis deals with the application of Markov chains for the production of concrete products. The theoretical part is focused on clarifying the concepts of risk management and describes the procedures for dealing with classical Markov chains. There are presented basics of fuzzy logic and finally there is explained the procedure using fuzzy logic in calculating of classical Markov chains in the subsection entitled Fuzzy Markov chains. The practical part describes production process, namely concrete pavements. On this production process is applied knowledge from the theoretical part and there is a comparison and evaluation of two methods of Marcov chains calculation (classic and fuzzy approach).
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Analysis and assessment of risks in the construction of the shielding structures of medical irradiators.
Henzelová, Iveta ; Vymazal, Tomáš (referee) ; Hobst, Leonard (advisor)
The thesis focuses on the analysis and evaluation of the potential risks in the design and implementation of shielding structures against the effects of ionizing radiation. The rocedure of calculation and design optimization, according to the current wording of the Atomic Act and related regulations, is mentioned only marginally. According to DIN EN 31010: 2011 Risk Management - Risk Assessment Technique risk assessment were made by risk analysis. risk analysis. Risk management identified these methods - Analysis of the Causes and Consequences (Ishikawa diagram), Analysis Failure Mode and Effects (FMEA) and the Pareto diagram. These methods are implemented to identify and evaluate the associated risks. Based on the identification and assessment of these risks, appropriate measures are then proposed to reduce their impact.
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Risk analysis and evaluation of a construction work in food industry operation from design to implementation
Labounek, Martin ; Misák, Petr (referee) ; Vymazal, Tomáš (advisor)
This thesis is dealing with analysis and evaluation of quantitative, environmental, safety risks and dangerous, application of suitable methods to the concrete building work, to the concrete conditions of the project, surroundings of the building site, construction contractor's firms and implementation building site into operation. From ČSN EN 31010 Risks management – Risks assessment techniques were selected for work tools – Analysis of potential defects and their consequences (FMEA), Universal Matrix of Risk Analysis (UMRA), Hazard Analysis and Critical Control Points (HACCP), Pareto diagram. The aim of this thesis is to analyze and assess the quality, environmental and safety risks of selected construction process and conditions established and integrated management system to handle simple tools for the management and elimination.
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Fuzzy logic methods for the risk assessment
Kovář, Kamil ; Vymazal, Tomáš (referee) ; Misák, Petr (advisor)
Master´s thesis deals about problematic of fuzzy logic, fuzzy sets and operation with them. Also thesis describing procedure of quantification risks through fuzzy sets, process of fuzzyfication, defuzzyfication a theirs application in the expert systems FMEA and FMECA. Using selected chapters of czech states standards are established critical areas in building process, it is a chapters about quality, safety and environment. With these areas by using fuzzy sets theory are created the procentual input values in the decision program, created by Matlab. Output from program is decision how big the risk rate is and if is necessarily make corrective measures. A concrete example is the production of concrete goods, describing production process and composition of fresh concrete. A practical example, created by using information from real company, is a decision about the risk rate in the qualitative area.
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Possibilities of evaluation durability of the surface layer of concrete structures
Blažek, Michal ; Žalud, Oldřich (referee) ; Vymazal, Tomáš (advisor)
The thesis is focused on possibilities of durability evaluation of surface layer of concrete structures. The durability of concrete surface layer usually determines the durability of the structure as a unit. It has to be determined in what environment the structure is situated and what influences it has to face, to set the durability of the structure. There is a several normative prescription to set the resistance of the structure. There is formulated a summary of the most widely used and known prescriptions in the theoretical part of the thesis. It is a lot of effort to estimate the durability of the concrete by estimation of permeability of the concrete surface layer recently. Thus these methods are also formulated in the summary and there are compared the individual outputs of the tests. The permeability and pore structures of the concrete surface layer are crucial parameters for the durability of concrete structure. These parameters influence the construction properties of the concrete as well, thus the thesis is focused on relationship of the pore structure and the strength in press of the concrete.
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Influence of dosage of steel fibres on the loss of consistency of fresh concrete and compresive strength of hardened concrete.
Kuře, Václav ; Źalud, Oldřich (referee) ; Vymazal, Tomáš (advisor)
Bachelor work is focused on problems of a consistency of fresh fiber reinforced concrete. The consistency was characterized by a slump test and by a test of spilling how is it described in ČSN EN 12350. Obtained results are compared with a reference sample of a fresh concrete and between themselves. Further the work is focused on volumetric changes during maturation which are integral part of physical properties of the concrete. Influence of a dispersed reinforcement was monitored on the cube strength in plain pressure of individual mixed sample too. Total evaluation of tested parameters is states at the end of the work including comment about possible ways of interference of tests.
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