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Optimization of UMTS access network
Havlíček, Karel ; Kovář, Petr (referee) ; Novotný, Vít (advisor)
This master’s thesis deals with a UMTS radio access network optimization, containing radio interface analysis, services and procedures description, ways to correct parameters calculations and settings and other issues necessary for a correct access network operation. The goal is effective network operation, minimum costs and maximum performance and flexibility of the network. The optimization during system operation is important because of the system character. The UMTS system uses the WCDMA technology, where particular users share the same frequency band and they are distinguished from one another via code sequences. The capacity of such a system is then given by the interference level - each particular user increases the interference level by the value corresponding to his transmit power. The maximum cell capacity is determined by the maximum interference level at which users can still operate with required services, so it is related not only to the number of users, but also to their bit rate. The optimization allows effective usage of the system for different services with different requirements. The main optimization tool is the radio resource management, containing number of algorithms, such as admission control, which decides the acceptance or rejection of a new user demanding certain service, power control, which ensure that users transmit with a minimal power sufficient for required service, handover and cell selection algorithms etc. The major parameter used by these algorithms is a cell load factor, which is related to the interference level margin. There are several methods for the load factor estimation and some of them are described in this work. Some other optimization techniques are mentioned here, too. This work also contains a laboratory exercise proposal for radio resource management introduction using the OPNET Modeler network simulation tool.
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Engineering optimization models
Tydlačka, Martin ; Plšek, Jan (referee) ; Popela, Pavel (advisor)
A cross-section of a girder made out of profile I is designed with respect to random loads, to which a girder will face during life time. Because the random loads are there, we need another aaproach to solving this exercise. Acceptable aproach is usage of optimisation and four choosen models, solving random loads. The cross-section has been to optimize with respect to minimal weight subject the safety constraint. Goal of this thesis is to present method of transfer structural exercise to exercise of mathematical optimisation, present four choosen models and apply this to exercise with random loads.
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Minimum wage in Czech republic after 1990 and its use as supplement to social transfers
Stehlík, Jan ; Bartůsková, Lucia (advisor) ; Ševčíková, Michaela (referee)
The aim of this thesis and its main contribution is to propose a model of optimal minimum wage that takes into account the income structure of the Czech population and the impact of adjustments to the minimum wage on unemployment and the structure of social transfers. Model brings the optimization of household income and savings in social policy redistribution, while optimizing employment and social benefits . The main hypothesis of this work is the assumption that the minimum wage can serve as a supplement social transfers. Given the ever- increasing expenditure on social security system and an open , lively debate about the consequences of the introduction of a minimum wage, this is a very current topic that needs attention. Contribution of research of this issue is to design possibilities for savings in expenditure on social policy. In the theoretical part the emphasis is aimed on the characteristics of household income, income inequality, the theoretical foundations of the social security system , tax theory and especially the concept of the minimum wage from the perspective of different economic schools. This part states the grounds for further statistical analysis and research in selected models of optimal minimum wage. The practical part is an analysis of three selected models of optimal minimum wage as well as an analysis of legislative developments and statistical values of key indicators to which the foundations were laid in the theoretical part. The research emphasizes the correlation between variables in national economy, identifying key social benefits appropriate to optimize and the implementation and effects of a possible increase in the minimum wage . The main focus of the practical part is a combination of previously gained knowledge to design model of optimal minimum wage.
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University Schedule Optimisation
Skrbková, Tereza ; Jablonský, Josef (advisor) ; Skočdopolová, Veronika (referee)
Scheduling is a practical optimisiation problem which can be solved by means of integer or binary programming methods. This paper focuses on university scheduling, in particular the schedule of the University of Economics in Prague, it is however possible to apply the results to schedules of other universities. We begin with the basics of linear programming, focusing on integer and binary programming as well as selected methods used to solve these problems. We then construct an optimisation model for the schedule of a subset of subjects based on real requirements (data 2009) and we compare the results with the actual schedule of the University of Economics in Prague. In conclusion we discuss some of the assumptions made during model development. The model is then generalised to include the entire set of subjects of the university. For the conversion of the software results into a more legible format, we include two MS Excel macros as part of this paper.
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Možnosti ladění a optimalizace akustických rezonančních vlastností vokálního traktu člověka
Radolf, Vojtěch ; Vampola, T.
The paper deals with optimization process finding such geometrical form of acoustical cavities of the human supraglottal spaces which leads to excitation of predefined acousic resonance, especially between a domain of the third and the fifth formant. The problem is solved by the transfer matrix method using conic acoustic elements for the vocal tract modelling and numerical method of searching a minimum of a goal function of several variables. The results should help to obtain a physical background for voice rehabilitation, for teaching of opera singers at musical facuoties and for better understanding of biomechanics of voice production.
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Optimisation of the collection service process in the context of DHL
Rabiňák, Štěpán ; Novák, Radek (advisor) ; Zajíc, Petr (referee)
The goal of this master thesis is to optimise the collection service process of the company DHL Global Forwarding (CZ) s.r.o. and to identify the best collection service provider. The optimisation process will be based primarily on price comparison but also other criteria will be included. To achieve the goal, the content of the work was divided into four parts. In the first chapter, the term of collection service is defined as well as briefly described, including the legal context of collection services. Second chapter provides general information about the collection service market and the collection services currently provided by DHL Express. It also contains a case study -- DHL Global Forwarding -- which describes the role of collection services within the seafreight transportation of this company. Third chapter is the analyses part that provides information about a standard consignment, requirements for the analyses, selection of companies, comparison of their prices and finally comparison of transport conditions and extra services provided by the least expensive companies. The last chapter of this master thesis tries to find solutions to revealed problems and make overall suggestions for DHL Global Forwarding (CZ) s.r.o. as well as DHL Express and BOHEMIA CARGO.
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