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The Controlling Study
Herda, Tomáš ; Mikovcová, Hana (advisor) ; Herda, Zdeněk (referee)
The main goal of this Diploma´s Thesis is to make a model for calculation of water and sewer rates for the company Vodovody a kanalizace Náchod, a.s. when sticking to the set criteria both from the side of VaK Náchod, a.s. and law regulations. Based on the theoretical part an analysis of customer sensitivity to the price changes using the data for last 20 years follows. Findings from the first two parts are used in risk analysis in next part. The created model calculates the water and sewer rates based on the information from the company accounting system in the way to generate sufficient financial resources to fulfill the renovation plan of infrastructural property plant and equipment and to transfer given amount to the company funds. In addition, the model monitors whether the legal condition of maximal allowable increase of profit per m3 is met. In the customer sensitivity to the price changes part the price elasticity of demand for water and sewer rates is calculated based on the data from 1995 to 2015. The assumption of inelastic demand is confirmed. Risk analysis part is deals with potential risk regarding the demand and prices. Potential impacts for the most significant risk are quantified. The analysis uses knowledge gained in the first two parts. It was confirmed that potential risks are exiting but do not have any significant impact on the going concern of VaK Náchod, a.s. The created model has been already used for the calculation of prices for the year 2017. Customer sensitivity analysis to the price changes and link to the potential risks is an additional information for VaK Náchod, a.s. which validates that nowadays, there are no significant threats which could affect the demand and water and sewer rates significantly.
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Modelling, parameter estimation, optimisation and control of transport and reaction processes in bioreactors.
ŠTUMBAUER, Václav
With the significant potential of microalgae as a major biofuel source of the future, a considerable scientific attention is attracted towards the field of biotechnology and bioprocess engineering. Nevertheless the current photobioreactor (PBR) design methods are still too empirical. With this work I would like to promote the idea of designing a production system, such as a PBR, completely \emph{in silico}, thus allowing for the in silico optimization and optimal control determination. The thesis deals with the PBR modeling and simulation. It addresses two crucial issues in the current state-of-the-art PBR modeling. The first issue relevant to the deficiency of the currently available models - the incorrect or insufficient treatment of either the transport process modeling, the reaction modeling or the coupling between these two models. A correct treatment of both the transport and the reaction phenomena is proposed in the thesis - in the form of a unified modeling framework consisting of three interconnected parts - (i) the state system, (ii) the fluid-dynamic model and (iii) optimal control determination. The proposed model structure allows prediction of the PBR performance with respect to the modelled PBR size, geometry, operating conditions or a particular microalgae strain. The proposed unified modeling approach is applied to the case of the Couette-Taylor photobioreactor (CTBR) where it is used for the optimal control solution. The PBR represents a complex multiscale problem and especially in the case of the production scale systems, the associated computational costs are paramount. This is the second crucial issue addressed in the thesis. With respect to the computational complexity, the fluid dynamics simulation is the most costly part of the PBR simulation. To model the fluid flow with the classical CFD (Computational Fluid Dynamics) methods inside a production scale PBR leads to an enormous grid size. This usually requires a parallel implementation of the solver but in the parallelization of the classical methods lies another relevant issue - that of the amount of data the individual nodes must interchange with each other. The thesis addresses the performance relevant issues by proposing and evaluation alternative approaches to the fluid flow simulation. These approaches are more suitable to the parallel implementation than the classical methods because of their rather local character in comparison to the classical methods - namely the Lattice Boltzmann Method (LBM) for fluid flow, which is the primary focus of the thesis in this regard and alternatively also the discrete random walk based method (DRW). As the outcome of the thesis I have developed and validated a new Lagrangian general modeling approach to the transport and reaction processes in PBR - a framework based on the Lattice Boltzmann method (LBM) and the model of the Photosynthetic Factory (PSF) that models correctly the transport and reaction processes and their coupling. Further I have implemented a software prototype based on the proposed modeling approach and validated this prototype on the case of the Coutte-Taylor PBR. I have also demonstrated that the modeling approach has a significant potential from the computational costs point of view by implementing and validating the software prototype on the parallel architecture of CUDA (Compute Unified Device Architecture). The current parallel implementation is approximately 20 times faster than the unparallized one and decreases thus significantly the iteration cycle of the PBR design process.
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DCTOOL-A3
Bakule, Lubomír ; Papík, Martin ; Rehák, Branislav
DCTOOL-A3 is a documentation of Matlab routines developed for the design of decentralized control of large scale complex systems. The current beta version covers three areas as follows:\nReport 4.1 deals with the event-triggered control design for unstructured uncertain systems. Both non-quantized and quantized feedback is analyzed. The results are given in terms of linear matrix inequalities (LMIs). Logarithmic quantizer is used. Numerical example illustrates the effectiveness of the presented results.\nReport 4.2 presents a new decentralized overlapping wireless control design with a switched communication protocol. The method is applied by simulations on the 20-story building structure including the test of robustness of the methods against sensor failures and network node dropouts of a digital network.\nReport 4.3 presents the construction of a new decentralized wireless controller and a set of heuristic algorithms for evaluation of packet dropouts, sensor faults and actuator faults. The digital network operates at the standard frequency used in well-known widely-used industrial protocols. The results are tested at the Benchmark model decomposed into two disjoint substructures. The results are published. Thus, the details are omitted here.
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Optimizing controller settings in terms of quality of work gasoline engines E85
Kotek, Tomáš ; Pexa, Martin (advisor) ; Malaťák, Jan (referee)
The work deals with optimizing the operation of spark ignition internal combustion engine on fuel E85. The theoretical part is devoted to the issue of biofuels in terms of production, distribution and use in internal combustion engines.
The experimental part is devoted to the design and verification of the additional control unit (ADU) which solves the optimisation of operation unmodified engine on E85.
The first part of the experiment is dedicated to the design and construction of ADU with aim to faultless operation of the engine on E85.
The second part of the experiment was devoted to optimisation of engine operation in terms of fuel consumption using dynamic changes of the injectors opening time. Part of the experiments was an evaluation of emissions production and impact on the performance parameters of the engine.
The final part of the experiment evaluates the achieved results at the various settings strategy of ADU and compares them with results during engine operation on prescribed fuel N95.
By the dynamic change of the injector opening time were reached decrease in fuel consumption by about 5%, reduction in CO production by around 70%, approximately fourfold increase in the production of NOx emissions and about 50% decrease in production of particulate matters.
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Valve controls and their timing
Vajčner, Patrik ; Pexa, Martin (advisor) ; Kotek, Tomáš (referee)
Abstract: Comparison of different types of valve operating mechanisms is the main aim of the Bachelor thesis. This was done from the point of view of the construction manufacturing, with regard to the engine performance, user´s comfort and fuel consumption of a vehicle. There were two types of valve operating mechanisms chosen for the purpose of the Thesis. The first one is a typical classic system whereas the second one is a modern type with a possibility of timing, which allows different timing for valves opening and closing. This process is dependent on the current requirement of engine output. Achievement of the optimal engine output for every specific type of ride is not the main purpose of the correct timing of valves and engine run adjustment in a vehicle. It also allows for a reduction of the excessive engine load and gradual wearing of each part of the system. Of course another very significant reason is to lower the fuel consumption as much as possible with regard to reduction of harmful, environmental unfriendly gases and emissions.
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Analysis of logistics in freight transport technologies
VÁCHOVÁ, Monika
Bachelor thesis deals with the analysis individual technologies applied in logistics trucking transport.The thesis is focused on the information and satellite technologies. In terms of information technology were introduced various systems used in business ČSAD JIHOTRANS and then made a comparison. In terms of satellite technology was introduced control , navigation and tracking systems used in this enterprise. The next part dealt with freight and construct a calculation I estimate the cost of freight vehicles. Based on the estimates were submitted its own proposals for improvement.
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The technical monuments as a part of tourism in the region of Týn nad Vltavou
DOBEŠ, Jakub
This thesis processes a database of technical monuments in the city of Týn nad Vltavou and its surroundings. There was made a survey and controlled interviews with local businessmen and on its basis two plans of tourist routes and one cycle route were created. These plans of technical monuments include also its financing and project of new bike rentals.
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Ethics of auditors in practice
SVOJŠOVÁ, Pavlína
In my thesis I evaluated and assessed the activities of auditors in relation to the ethics of behavior in terms of legislation of the Czech Republic. I focused on the published cases of misconduct of auditors and the subsequent punitive sanctions. Ethical behavior is the basis for the auditor's professionalism. In connection with the accounting scandals and falsification of accounting and audit reports, the public began to discuss - among other things - auditors' liability for fraud detection leading to distorted accounts of the entities and the principles of ethical behavior started to get into the spotlight of auditors?, which was later enshrined in legal and professional standards including Code of Ethics of the International Federation of Accountants (IFAC). Expectations of many users of financial statements from the auditor's report are too high and usually go up beyond what the auditor can actually verify and confirm. However, it must be acknowledged that not all auditors are sufficiently aware of their responsibilities in relation to the distortion of financial statements due to fraud or misconduct, and adequately adapt their audit procedures due to them. Certainly worth mentioning is the most visible impact of accounting scandals in the accounting and auditing profession - the fall of Arthur Andersen, one of the former "Big Five" auditing firms. Accounting profession has responded by developing and tightening ethical standards with an emphasis on the conduct of professional accountants in the public interest, not only in the interests of individual clients or employers. The role of audit in society is irreplaceable. Quality of the audits undertaken, however, ultimately depends on the auditor's discipline and education, the control of the Council Chamber and also public oversight of auditing, as well as pressure of the users of financial statements and of the representatives on the appropriateness and quality of outputs. Ethics in the auditor's work and its compliance in life are the things that determine auditor?s reputation.
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Automation of the cultivation process in term of program control of temperature and moisture
Beneš, Vojtěch ; Papežová, Stanislava (advisor) ; Neděla, René (referee)
Theoretical part of this thesis describes different kinds of sensors used for measuring temperature and humidity of air. These sensors are categorized according to the principle on which they operate. It also describes their characteristics like range, accuracy and other aspects important for determining suitability for a glasshouse automation system.
Practical part of this work covers design of this system which can be used for auto-mated controll over temperature and humidity. It reasons about suitability of different kinds of sensors and materials. It also describes a software system capable of maintaining and changing humidity and temperature based on user input. Results of different mea-surements done during the system's operation in a variable environment are evaluated to draw conclusions about the system's ability to maintain constant temperature and humidi-ty levels inside the glasshouse.
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