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Image analysis in tribodiagnostics
Machalík, Stanislav ; Stodola,, Jiří (referee) ; Tillová,, Eva (referee) ; Zemčík, Pavel (advisor)
Image analysis of wear particles is a suitable support tool for detail analysis of engine, gear, hydraulic and industrial oils. It allows to obtain information not only of basic parameters of abrasion particles but also data that would be very difficult to obtain using classical ways of evaluation. Based on the analysis of morphological or image characteristics of particles, the progress of wearing the machine parts out can be followed and, as a result, possible breakdown of the engine can be prevented or the optimum period for changing the oil can be determined. The aim of this paper is to explore the possibilities of using the image analysis combined with the method of analytical ferrography and suggest a tool for automated particle classification. Current methods of wear particle analysis are derived from the evaluation that does not offer an exact idea of processes that take place between the friction surfaces in the engine system. The work is based upon the method of analytical ferrography which allows to evaluate the state of the machine. The benefit of use of classifiers defined in this wirk is the possibility of automated evaluation of analytical ferrography outputs; the use of them eliminates the crucial disadvantage of ferrographical analysis which is its dependence on the subjective evaluation done by the expert who performs the analysis. Classifiers are defined as a result of using the methods of machine learning. Based on an extensive database of particles that was created in the first part of the work, the classifiers were trained as a result, they make the evaluation of ferrographically separated abrasion particles from oils taken from lubricated systems possible. In the next stage, experiments were carried out and optimum classifier settings were determined based on the results of the experiments.
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Optimization of network flow monitoring
Žádník, Martin ; Lhotka,, Ladislav (referee) ; Matoušek, Radomil (referee) ; Sekanina, Lukáš (advisor)
The thesis deals with optimization of network flow monitoring. Flow-based network traffic processing, that is, processing packets based on some state information associated to the flows which the packets belong to, is a key enabler for a variety of network services and applications. The number of simultaneous flows increases with the growing number of new services and applications. It has become a challenge to keep a state per each flow in a network device processing high speed traffic. A flow table, a structure with flow states, must be stored in a memory hierarchy. The memory closest to the processing is known as a flow cache. Flow cache management plays an important role in terms of its effective utilization, which affects the performance of the whole system. This thesis focuses on an automated design of cache replacement policy optimized to a deployment on particular networks. A genetic algorithm is proposed to automate this process. The genetic algorithm generates and evaluates evolved replacement policies by a simulation on obtained traffic traces. The proposed algorithm is evaluated by designing replacement policies for two variations of the cache management problem. The first variation is an evolution of the replacement policy with an overall low number of state evictions from the flow cache. The second variation represents an evolution of the replacement policy with a low number of evictions belonging to large flows only. Optimized replacement policies for both variations are found while experimenting with various encoding of the replacement policy and genetic operators. The newly evolved replacement policies achieve better results than other tested policies. The evolved replacement policy lowers the overall amount of evictions by ten percent in comparison with the best compared policy. The evolved replacement policy focusing on large flows lowers the amount of their evictions two times. Moreover, no eviction occurs for most of the large flows (over 90%). The evolved replacement policy offers better resilience against flooding the flow cache with large amount of short flows which are typical side effects of scanning or distributed denial of service activities. An extension of the replacement policy is also proposed. The extension complements the replacement policy with an additional information extracted from packet headers. The results show further decrease in the number of evictions when the extension is used.
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The Pump with a Diffuser with Stochastic Blades (Runner and Diffuser)
Dobšáková, Lenka ; Melichar, Jan (referee) ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This doctoral thesis studies the non-uniform blade cascade for centrifugal pumps. Influence of non-uniform blade cascade is investigated on the impeller and diffuser. A non-uniform blading impeller of pumps in this doctoral thesis was examined in terms of influence on efficiency characteristic. The idea of using non-uniform blading is to obtain a flat efficiency characteristic. Then the centrifugal pump could be used on larger scale of power with achieving a sufficiently high efficiency. The work is based on experimental measurements and numerical simulations of non-uniform hydraulic pump components. Non-uniform impeller and the diffuser were newly designed for this research. A new measuring track of small submersible pumps was needed to design and build for measurements. Different pump combinations with conventional hydraulics on one working point and hydraulics with non-uniform were measured. All measurements were evaluated and characteristics of efficiency, head and power were obtained for each measured combination. Some of pump combinations (which were measured in experiment) were numerically simulated by program Ansys Fluent. Data needed to evaluate the characteristic of efficiency and specific energy were collected from each numerical simulation. A theoretical consideration concerns the influence of non-uniform blade cascade applied on diffuser. The suggestion how to decrease hydraulic losses in canals was done. The theoretical consideration how to make a flat efficiency characteristic was made.
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Právní a zdravotně sociální aspekty činnosti OSPOD jako ustanovených opatrovníků v zámu nezletilých dětí
BORSKÁ, Jana
The Czech Republic as a signatory of the Convention on the Rights of the Child has vested the practice of state administration in the field of care for minor children to municipalities with extended powers, where the protection of the rights and legitimate interests of minor children is safeguarded by state authorities of social and legal protection of children (ASLPC hereinafter). These authorities are incorporated to the extent laid down by the Act on Social and Legal Protection of Children (Act No 359/1999 Coll., as amended). The position and roles of ASLPC and their competence and jurisdiction are also regulated by the same act. The position of workers of these authorities and its legal embodiment is equally important. Regarding professionality, there are high demands on these workers. In the Czech Republic, significant changes in legislature have been made over the past three years. These amendments have led to the strengthening of the rights of minor children and to the establishing of new tools for their protection. In connection with the adoption of new substantive regulation of family law, which is now exhaustively dealt with by the Act No 89/2012 Coll., the Civil Code, new procedural rules have been established regarding protection of rights of minor children. Such procedural legislation includes (apart from the long-existent Act No. 99/1963, the Code of Civil Procedure) the Act No 292/2013 Coll., on Special Civil Proceedings. The decision-making regarding minor children has been vested mainly by the state into the competence of courts. The courts appoint the locally relevant ASLPC as a guardian who then represents the interests of minor children. The purpose, interwoven with and derived from the first one, was to explore the opinions of selected social workers of ASLPC and of district court judges regarding the defined problems occurring during the work of ASLPCs and courts while protecting the interests of minor children. These particularly include: the use of the tool of precautionary measure; problems of different territorial jurisdiction of courts and ASLPCs; processing of complaints regarding bias in various phases of the proceedings; professional training of workers of ASLPC It is evident from the proposals of both judges and ASLPC workers that it is necessary to unify territorial jurisdiction. The courts are suggesting the priority criterion of the address where the child mainly resides. ASLPC workers suggest the official permanent residence as the prime criterion. Bias causes problems in all phases of proceedings. It is obvious that courts take differing approaches towards the solution of this problem (some courts solve the problem of bias complaints filed by the parties while other courts do not) and for ASLPC workers it is difficult to assess how to act when such complaint is raised against them. The training of ASLPC workers - workers are obliged to educate themselves and their employer is obliged to finance such training. Not all ASLPCs are able to provide training in the required extent - due to financial reasons (the average costs of education of one employee pose from 9,169 to 13,400 CZK annually and they cover approximately 6 days of training). The heavy work-load caused by insufficient numbers of ASLPC employees prevents them from completing such compulsory training. As part of the examination of the "participation of a collision guardian in court proceedings" it has been found out that irregular participation of the worker in the proceedings (absence from participation in appeals proceedings); incomplete reports (directed to courts) from surveys in families. Based on comprehensive examination of the problems of territorial jurisdiction, it was recommended that requests are independently recorded and financial compensation is provided for ASLPCs who are requested to represent minors in front of courts, to draft proposals for precautionary measures.
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Nation-building in Iraq after 2003
Aliová, Naďa ; Karásek, Tomáš (advisor) ; Střítecký, Vít (referee)
The main aim of the master thesis titled "Nation-Building in Iraq after 2003" is to evaluate the success of nation-building processes in Iraq between 2003 and 2011. The analytical approach of the German political scientist Jochen Hippler serves as a theoretical and terminological starting point. The thesis is divided into five chapters. The first chapter deals with the general and conceptional problems and of the terms "nation" and "nation-building". This is followed by a brief overview of Iraqi history. The next part is devoted to Hippler's three central elements of successful nation-building applied to the Iraqi context (i.e. integrating ideology, national integration and state-building). The third chapter explores whether ethnosectarian identities are subordinate to Iraqi national identity. The forth chapter is focused on Kurdish- Iraq relations and its potential implications for territorial (and economic) cohesion of Iraq and the following chapter deals with capabilities of the state apparatus concerning governance, providing security and delivering basic services. In conclusion, the level of success is summarized in the three dimensions respectively as well as with regad to overall nation- building process in Iraq.
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Methods of transfer pricing by multinational enterprises in terms of tax administration
BÖHMOVÁ, Dana
The aim of the thesis is the analysis and evaluation of the application of transfer (transfer) the prices used in transactions of multinational enterprises in terms of tax administration. Generally describe the basic principles of the United people, the principle of the arm, the methods of the determination of the transfer pricing and documentation for transfer prices in accordance with the international rules and standards laid down by the Organization for economic cooperation and development, in accordance with the laws and guidelines of the Czech Republic. Furthermore, this thesis seeks to clarify the specific case studies, which are based on the practice of financial management, and the case-law, the effects of the determination of the transfer pricing methods, comparison of their advantages and disadvantages in establishing transfer prices in the Czech Republic. At the conclusion of the thesis summed up the results and recommend the adoption of more appropriate legislation in each of the areas of transfer pricing in the Czech Republic.
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Small Size Municipality Revenues in Czech Republic
JIREKOVÁ, Kateřina
The aim of this thesis is to evaluate the system of municipality incomes in the Czech Republic with respect to specifics of small municipalities. In last few years these municipalities have become a frequently discussed topic because of their lower incomes. The legislation has been devoting to this problem since 2008 and the differences between large and small municipalities in the Czech Republic were removed. There is income analysis of all municipalities in the Czech Republic from 2000 up to 2012 in this thesis. The municipalities were divided into two groups. The first group contains small villages, defined as municipalities up to 499 inhabitants. In the second group there are other municipalities of the Czech Republic except small villages, statutory cities and the Capital City of Prague. The real data were recalculated per head for this analysis and minimum, maximum, median and arithmetic mean were found. Variability of incomes is evaluated from these results. Regression and correlation analysis is made in some groups of revenues because of finding dependence among variables. Disparity in incomes of small towns and other communities is assessed by comparing the arithmetic means and medians between groups of municipalities using a Two-Sample t-test and Mann-Whitney test. Revenue growth is evaluated determination of the trends of the time series using linear regression. Some specifics in financing small villages were found from these analyzes. There was also confirmation of the hypothesis that small municipalities have lower incomes per an inhabitant.
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Customer Relationship Management in B2B
VRCHOTA, Tomáš
This thesis is focused on CRM systems for small and medium-sized enterprises operating in the B2B market. The main goal was to identify the needs and possibilities of the use of CRM systems in small and medium-sized enterprises operating in the B2B market and propose the appropriate CRM systems for this target group. Needs of small and medium-sized enterprises were explored by qualitative research by individual structured interviews. In the next part of the thesis I selected 33 CRM systems which I analyzed for the required functionality. In the last part of the thesis I evaluated the selected CRM systems for small and medium-sized enterprise according to criterions: price, customer service and user-friendliness.
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Analysis of business and entrepreneurship sector policy in the town Písek
KOSTOHRYZOVÁ, Andrea
The aim of my thesis is to analyse business and entrepreneurship sector of the town Písek and positive attitude of the local municipality towards private business sector operating on the largest industrial zone in South Bohemia. Theoretical part concentrates on description and explanation of the basic terms and relations dealing with the topic of regional development. Afterwards, I focus on description of public and private sectors and possibilities of providing financial subsidies from both national and EU funds. The first section of practical part concentrates on detailed description of the region Písek from various viewpoints social, demographic, economic, industry sectors and competitiveness. Furthermore, I describe and analyse business and entrepreneurship conditions within the industrial zone lying on the edge of the northern part of the town Písek focusing on the past, present and future. I also describe clusters and evaluate success rate and effectiveness of the town Písek in obtaining financial subsidies from both national and EU funds. The last part uses the findings to compare the industrial zone in Písek with a similar industrial zone in Vodňany. Finally, I summarise and evaluate all findings. I outline the possibilities of further development of the industrial zone Písek and ways to obtain financial subsidies for development of business and entrepreneurship sector in the town Písek from accessible European funds.
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