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Research of Methods for Significant Accereation of Parameter Estimation of Simulation Models
Appel, Martin ; Opluštil, Vladimír (referee) ; Křivánek, Václav (referee) ; Grepl, Robert (advisor)
The thesis focuses on achieving a significant speed-up in the estimation of simulation model parameter values. This is achieved through the appropriate choice of a solver that is computationally less demanding, but at the same time has an acceptable error in the range of parameter values, through the use of distribution of computations on parallel threads, heuristic methods for reducing the space of parameter values, and modification of optimization methods. In this thesis, the research related to the objectives of the thesis is first discussed, then the exact objectives of this thesis are stated and the implementation of each objective is described in separate chapters. The results of this thesis include a tool used to analyze solver choice, an analysis of parallel thread efficiency, a parallel simulation distribution tool, nine modified optimization methods, and a new tool for estimating parameter values. Finally, the results obtained are evaluated.
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Optimization of Supply
PAVLÁSKOVÁ, Terezie
The diploma thesis deals with the optimization of inventory management with the help of operational research methods. The aim is to appropriately select and apply the inventory management method in a real company. To provide a broader view of this issue, the work begins with a brief presentation of logistics. In addition, stocks are described and classified together with the costs associated with them. Then the possibilities of inventory management in the company are presented. A brief description of the mathematical modeling is later followed by the selected inventory management methods, which are specified in more detail. In the second half of the thesis, a construction company is introduced. In the company, the ABC analysis of stocks was carried out, taking into account turnover values. Stocks were selected for optimization based on the results. Their recorded historical consumption was analyzed and, if necessary, adjusted to enable application of inventory management methods. The P-system of inventory management was applied to the selected stocks. The proposed supply solution was compared with the currently implemented system based on the resulting costs. The conclusion of the thesis contains an evaluation of the proposed optimization and other recommendations that the company should apply.
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Reliability-based structural optimization
Slowik, Ondřej ; Červenka,, Jan (referee) ; Lepš, Matěj (referee) ; Novák, Drahomír (advisor)
Presented PhD thesis deals with reliability-based optimization of structures and problems related to automatization of various algorithms of solution for various reliability-based optimization task definitions. The text presents a general definition of the reliability-based optimization problem, followed by a description of state of the art within the broad field of reliability-based optimization as well as the current state of the art of selected methodology utilized or developed by the author during his work in order to meet objectives of his dissertation. The theoretical part of the thesis is supplemented by a description of developed software tools and by examples of described methodology applications during a solution of practical problems of nonlinear numerical models reliability-based optimization and problems of inverse analysis.
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Optimization of recycled concrete materials from precast concrete elements and their characteristics for building information model
Venkrbec, Václav ; Mésároš,, Peter (referee) ; Šuhajda, Karel (referee) ; Henková, Svatava (advisor)
The dissertation thesis deals with the use of recycled concrete aggregates obtained from deconstructed parts of a precast panels’ apartment building. Furthermore, the work presents an optimization supplier-logistics algorithm to achieve a wider application of recycled aggregate concrete (RAC) in structural concrete in a new building. As part of the newly developed optimization algorithm of ready-mixed concrete suppliers, non-graphical data from the building information model (BIM) were intensively used. The work also addresses the transfer of data from and back to the information model and the definition of characteristics needed to optimize the entire process. At the theoretical level, the work deals with a comprehensive literature review of the above-mentioned fields. The experimental part of the work is focused on materials research carried out in order to verify the suitability of a particular type of RAC for structural use. The work introduces the procedures and test results of two types of recycled aggregates and then presents a range of recycled concrete recipes with partial replacement of aggregates for RCAs, obtained from prefabricated panels of high-rise buildings. The gained test results show the technical suitability of the tested RCA sources for producing medium-strength structural RAC. A significant part of the analytically oriented experimental part of the work is the logistic optimization scenario with its own matrix-based discrete algorithm and economic graphical evaluation. The case study examines the relevance of the proposed algorithm on a real scenario, namely the construction of the scientific technology institute CEITEC in Brno. Furthermore, the work summarizes the issue of BIM and presents a methodology for handling non-graphical information of the building model to define the characteristics of recycled concrete in buildings. The conclusions are addressed both for practice and for the development of scientific disciplines. The work provides
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GENERATIVE FURNITURE
Picek, Matěj ; Krejčí, Daniel (referee) ; Tobola, Ondřej (advisor)
This thesis deals with the basic principles of the functioning of the technology of generative design, using the method of topology optimization and finding their potential with the capabilities of the application in the field of furniture design. The main outcome is a functional prototype of a low relaxing chair, which specific construction is designed using the method of topology optimization.
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Optimization of Inventory
PROKOPOVÁ, Nikola
The subject of this thesis is optimization of inventory in selected organization. Inventory optimization is a very important topic in each organization because it reduces storage costs. At the beginning the inventory theory is presented. It shows the meaning and types of inventory, inventory control and also different methods and models of inventory control. Inventory optimization in the enterprise can be reached by using models of inventory control. In the second part the company on which is applied the analysis of various mathematical and statistical methods is presented. Specifically ABC analysis where the individual components of inventory are divided into groups according to the importance. EOQ model which serves to minimise the cost of supply and tries to optimise the time cycle of the supply. Safety stock ensures the smooth running of the production and covers the extraordinary fluctuations between deliveries. At the end these methods are compared and evaluated.
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Optimization of a small induction machine’s slots
Šišák, David ; Janda, Marcel (referee) ; Mach, Martin (advisor)
This master thesis deals with optimization of the shape of the stator and rotor slots of induction motor with focusing on increasing efficiency. The theoretical part introduces the principles of optimization algorithms. Another part is devoted to design the shape of slots and its influence on the shape of slots on machine. On the models of motor was conducted the optimized shape of slots by using a genetic algorithm. Firstly, it was performed by using the analytical calculation in the RMxprt program, then by using the finite element method on two different models, whose difference simulates the influence of the production technology on the efficiency of the motor. Laboratory measurement was made on a real machine as well. The results of the measurement, calculations and optimizations are compared in the work.
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Optimization of Routes for Travel Agencies
Slavík, Radek ; Kučera, Petr (advisor) ; Křečková, Jana (referee)
Bachelor thesis deals with the optimization of the newly proposed routes for travel agency. The first part contains a literature search. This part deals with a logistics and orbital transportation problem. Circular traffic problem is explained using selected optimization methods. The second part is dedicated to the introduction of a travel agency SLAN tour for which a new tours were created. The sightseeing tours are formed and created by optimizing methods. Optimization is for two new tours that will include destinations in the Republic of Ireland. To achieve the least cost, tours were optimized by using selected methods. In conclusion, the results will be evaluated and new routes will be proposed.
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Optimization of concrete structures using stochastic optimization methods
Slowik, Ondřej ; Pukl,, Radomír (referee) ; Novák, Drahomír (advisor)
The thesis focuses the reader on the sense of optimization and its importance for civil engineering. It outlines the principles used by some optimization methods and discusses the possibility of combination of any type of methods LHS with other optimization method. The result is a new type of optimization method named Nested LHS described in the text of the third chapter. The fifth chapter applies some of the lessons learned to solve practical optimization problem - reinforced concrete bridge solved by nonlinear finite element analysis using pseudostochastic optimization method LHS mean.
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Analysis of Various Approaches to Solving Optimization Tasks
Knoflíček, Jakub ; Samek, Jan (referee) ; Zbořil, František (advisor)
This paper deals with various approaches to solving optimization tasks. In prolog some examples from real life that show the application of optimization methods are given. Then term optimization task is defined and introducing of term fitness function which is common to all optimization methods follows. After that approaches by particle swarm optimization, ant colony optimization, simulated annealing, genetic algorithms and reinforcement learning are theoretically discussed. For testing we are using two discrete (multiple knapsack problem and set cover problem) and two continuous tasks (searching for global minimum of Ackley's and Rastrigin's function) which are presented in next chapter. Description of implementation details follows. For example description of solution representation or how current solutions are changed. Finally, results of measurements are presented. They show optimal settings for parameters of given optimization methods considering test tasks. In the end are given test tasks, which will be used for finding optimal settings of given approaches.
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