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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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Processing and utilization of by-products of brewery operations for energy purposes
Foltis, Marek ; Malaťák, Jan (advisor) ; Bradna, Jiří (referee)
The diploma thesis called Processing and using of co-products from brewery for energetic purposes. The thesis concerns it self with analysis current situation on field of processing waste from brewery industry. The thesis is focused on possibility of using brewery waste for energetic purposes. The thesis is divided in to two parts. First part features literature research of the topic, using all available resources. Second part features real data from element analysis done on samples of brewery waste and calculation of main characteristics of brewery waste. All calculations concerns them self in using brewery waste like substitution for fossil fuel. Goal of second part of thesis also is evaluate possibility of using brewery waste to make brewing more efficient.
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Treatment of Liquid Phase of Digestate Enabling More Effective Utilization of Nutrients
Kotrč, Vlastislav ; Švehla, Pavel (advisor) ; Kulhánek, Martin (referee)
The present thesis focuses on theoretical evaluation of possible ways of processing liquid fraction of fermentation residue, allowing more efficient use of nutrients.
The introductory part is devoted to biogas, he described its origin, characteristics and possible uses. It is also characterized by a process of anaerobic fermentation and the factors influencing its course. The resulting products are energy-rich biogas and also mentioned fermentation residue. The fourth chapter describes the principle of operation of a biogas plant and a closer approach to the current situation in the Czech Republic and Europe. The main part deals with the rest of the so-called fermentation. Digestate and in particular its separate liquid component Liquid digestate containing a large amount of nutrients that can be effectively used with appropriate procedures. The final chapter is devoted to a description and critical evaluation of the methods of pre-treatment Liquid digestate.
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The development of waste treatment and impact on quality of life for residents of the city of Hradec Králové
Novotná, Petra ; Mikulová, Vlastimila (advisor) ; Ivana , Ivana (referee)
The purpose of thesis is to analyze waste management with focus on municipal waste, it is processing and it is recycling. This analysis is based on studies of specialist texts of Waste Management Plan of surrounding countries, WMP of Czech Republic in the period 2015-2024 and the WMP of time-frame 2016-2025 with prior evaluation of the WMP of a town. Then the thesis deals with waste management and treatment of municipal waste of Hradec Králové based on a field survey and consultations, it has documented equipment for treatment of municipal waste in the form of recycling plants, compost plant, secondary raw material collection centres, transfer stations, sorting lines and landfill. In the questionnaire-based survey for residents it identified their awareness, satisfaction with the system of collection, access to waste sorting and the distance to collection containers. Then the thesis deals with quality of life for residents in relation to waste management in Hradec Králové The thesis contains large numbers of processed graphs, tables, map reproductions in Arc GIS and the authors photo documentation of devises for waste management.
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Influence of selected factors on the fattening capacity and carcass values of bulls in the control station Želeč
PUFR, Josef
Cattle breeding is one of the part of traditional Czech agriculture. It is a vital part of economy consisting of two main branches - milk and beef production. Beef is one of the main products of cattle breeding sometimes provided by fattening of heifers, cows and bulls. Producing meat with the highest quality with low costs is the main goal of fattening the cattles. I have tested the influence of selected fators on the fattening capacity and carcass values of Czech Fleckvieh bulls in the control station as well as the economic requirements of the fattening period. I have compared the test period of 530 ? 10 days with period of 610 ? 10 days of fattening using the old and new technology of supplementation. Further fattening was provided by results of growing Charolais, Limousin and Czech Fleckvies x Simmental bulls. The results suggest that the increase of the period of fattening for 80 days had a positive effect on carcass yield (p < 0.001), assigning in the classification according to SEUROP and profitability of farming. The positiv relationships between breeding value of fathers and carcass yield of their sons was observed. Finally, the positive influence of new technology of fattening on the classification acording to SEUROP was shown.
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The strategy of the manufacturing company on the Vltavotýnsko
TRÁVNÍČKOVÁ, Jana
The basic aim of this work is to evaluate the economic health of an agricultural company and examination of its current data and business strategy with respecting of available resources and instable economic situation. In beginning of this work was given basic description of a firm, its business, strategy and basic attitudes to its creation including different ways of economic analysis. Part of this work was devoted to SWOT analysis or financial analysis. There is basic overview of absolute, ratio and distance economic roadsings. In this work two projects were considered in reason to improve economic results of ana-lyzed firm.
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Grants and their view in accounting
SMOLÍKOVÁ, Pavla
The main aim of this diploma thesis was to analyze the procedures for tender of grant applications, the evaluation of the possibility of their acquisition and to determine the process of gaining grants from accounting point of view. This work captured comprehensive process of gaining grants for the chosen company. Specific calls for proposals were selected and the projects´ grants were composed. Each individual project was evaluated according to the supplied criteria.
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Influence of soil tillage on lucerne root morphology in the seeding year
Diviš, Michal ; Hakl, Josef (advisor) ; Kamila, Kamila (referee)
The aim of this study was to evaluate effect of different soil tillage and seeding rate on alfalfa root morphology. The field experiment was established in 3 variants of tillage: shallow cultivation (MK), loosening (HK) and conventional tillage (plough), all under two seeding rate (4 and 7 MGS). After autumn cut, root samples were collected in the depth of 25 cm. Lower seeding rate increased intensity of branching and number of lateral root per plant. Total mass of roots per hectar was higher in higher seeding rate variant. Ploughed variant provided higher intensity of branching and branching depth was the deepest of all variants. Loosed variant showed highest branch diameter out of all variants. Highest plant number per square meter was achieved in loosed variant but shallow cultivation showed highest plant survival rate of all variants. Tillage affected weed infestation by 33,6 %. Dominant weeds in ploughed variant were field pennycress and pale persicaria. Dominant weeds in loosed variant were redroot pigweed and cockspur, while in shallow tillage variant dominant weeds were represented by cleavers and common knotgrass. Results of experiment show that shallow cultivation and loosening have similar influence on plant density and root morphology as conventional tillage. Reduced seeding rates are possible, but due to problematic field emergence of alfalfa and higher weed infestation of thinner stands, higher seeding rates prove themselves as superior.
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