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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 Introduction of Contact Ecotoxicity Tests for the Assessment of Terrestrial Ecosystems
Modlitbová, Pavlína ; Kráčmar, Stanislav (referee) ; Beklová, Miroslava (referee) ; Demnerová, Kateřina (referee) ; Vávrová, Milada (advisor)
This dissertation thesis is focus on using toxicity tests with testing organism - terrestrial isopod Porcellio scaber. This organism is use for toxicity assessment of selected anorganic compunds which could contaminate terrestrial ecosystem. This organism was selected for several reasons - sophisticated test methodology; well known biology of these animals and their ecological relevance. Besides classical endpoints such as mortality, change in mass of test specimens and the effect of the presence and concentration of contaminants onto food consumption; we monitored changes in the morphometric characteristics at the level of tissues and cells, the cytotoxicity and possibly bioaccumulation in various parts of the body of the organism. Selected test substance in this thesis were nanoparticles and inorganic salts. Wherein for chosen gold nanoparticles was carried out a complete study presents several levels of organization of living matter (organism, tissue, cell). For selected salts compound, this study was carried out on the behavior of organisms and classical endpoints.
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Monitoring stress in the mast
Bednář, Tomáš ; Beneš, Petr (referee) ; Bejček, Ludvík (advisor)
The subject of this bachelor´s thesis is an issue of measurement and monitoring stressing in the mast – high voltage and very high voltage.The solution of query, including the producer and the users, is also presented. The aim of this thesis is to propose sensors for this measurement and making practical measurement of the concrete very high voltage mast.
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TV news monitoring
Šamanová, Gabriela
June survey was also focused on TV news monitoring. Respondents answered questions about what TV news they watch, then they expressed their opinion on choice of TV news presented on TV, whether these TV news present only important news or whether there some important events are cut.Last question was devoted to how often respondents watch TV news.
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Strain-stress analysis of spinal segment
Pánis, Vladimír ; Janíček, Přemysl (referee) ; Návrat, Tomáš (advisor)
Presented work deals with the strain-stress analysis of a spinal segment while monitoring the influence of total disk replacement Maverick on the global behaviour of the spinal segment. It also assesses the influence of this implant on the nearest upper intervertebral disk. On the basis of CT images was in the program Rhinoceros created the geometry model of spinal segment Th12-L2. The geometry model of implant was applied between vertebra L1 and L2 instead of intervertebral disk from which the whole core was removed, while in the immediate surrounding of implant the part of disk was left, which is important from the view of stability. Subsequently were in the program Ansys Workbench created finite element models for two states: - healthy (unbroken) status - status with applied implant Then the calculations for movements were realized: lateral flexion, flexion, extension, rotation. For the same movements were realized calculations of the model simulated spinal fusion of the vertebras L1-L2. Finally an influence both of methods (total disk replacement, spinal fusion) on the intervertebral disk Th12-L1 was compared.
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Application of logistics processes in online shop
MELENOVÁ, Štěpánka
The aim of this bachelor paper was to evaluate an activity of the company TV Products CZ, Ltd. during a calendar year, assess the advantages and disadvantages of online shopping from the customer's view and compare it with traditional shopping at stores. In the theoretical part, the terms of e-shop and store were explained. This part was also occupied with the e-shopping history and development. Then this part was focused on the payment methods and the level of the customer services. In the practical part, the selected company was introduced at first and then all activities from orders to goods delivery to customers were monitored. It was realized by personal visit to this company. Through this visit the shortcomings were detected and the measures which lead to improvement and customers' satisfaction were created. The company should pay attention to these shortcomings and focus on their removal
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The agricultural drought monitoring and its users and correspondents
Bartošová, Lenka ; Trnka, Miroslav ; Semerádová, Daniela ; Hlavinka, Petr ; Štěpánek, Petr ; Zahradníček, Pavel ; Žalud, Z.
Drought monitoring in the Czech Republic is a key element in climate monitoring. The aim of this article is to describe the possible participation of agronomists, foresters and fruiterers in drought monitoring within the Integrated Drought Monitoring System. This system monitor drought occurence weekly on the base of various information (data from model SoiClim or outputs from satellite Aqua and Terra). One of the main pillar of the monitor is also information about drought impact on yields in the cooperation with especially farmers. Their expert assessment brings insight into actual situation in agricultural landscape in weekly time step. All results are free to download in www.intersucho.cz.
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Analysis of the trend of household debt in the Czech Republic in the period of 2000 - 2011
Kučerková, Zuzana ; Kotýnková, Magdalena (advisor) ; Pavlíček, Tomáš (referee)
The aim of this thesis is to analyze the level of household debt in the Czech Republic in the period from 2000 to 2011, causes of indebtedness and analysis of use of personal bankruptcy. The theoretical part is focused on economic, social and legal aspect of the issue of household debt. The practical part consists of analysis of statistical data describing the development of the level of household debt in the years 2000 - 2011 with the help of monitoring absolute and relative measuring indicators. Further analysis is carried out using of personal bankruptcy in the Czech Republic in the period from 2008 to 2012. On the basic of these analyses, this work suggests the ways to improve the situation of over-indebted households. Special emphasis is placed on the relatively new of vulnerable households - pensioners and it is also defined the causes of this phenomenon.
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Automatic monitoring production machines
Šíp, David ; Zbořil, Miroslav (referee) ; Lacko, Branislav (advisor)
This work deals with monitoring of tool machine. It is concerned with design and implementation of automation monitoring system at production company. This diploma work describes the way of automatic scanning of control data,elaboration obtain information and theirs presentation in user aplications. Diploma work serves like as instruction of median firms for implementation of automation monitoring system.
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Management styles and their relation to the satisfaction of employees
GRAMANOVÁ, Kamila
Abstract - Leader empowering behaviours and their relation with worker's satisfaction Current state: Nurse's work is physically and mentally demanding. Adequate knowledge and skills are also needed. Nurse managers whose leader empowering behaviours administer to good functioning of medical institutions have therefore a crucial role. In these days a monitoring of job satisfaction is an upcoming matter. According to that we can look for drawbacks and problems and take corrective actions. There is a 9th year of the nationwide research of safety and satisfaction of employees of Czech hospitals. Aim: The first aim of the research was to find out what leader empowering behaviours are used the most by nurse managers. The second aim was to find out how leader empowering behaviours influence satisfaction with work conditions of nurses. Two hypotheses were given. The first hypothesis postulated that nurse managers use democratic empowering behaviours the most. The second hypothesis postulated that satisfaction with work conditions of nurses is changeable, depending on leader empowering behaviours. Methodology: A quantitative method of data capture was chosen. Non-standardised questionaires with 30 closed questions were given out. There were four questions at the beginning to identify respondents. Other set of 15 questions was focused on recognition of leader empowering behaviours. Satisfaction with work conditions was monitored in the last set of questions. Results of the research were processed into graphs and tables. Research set: The research set included nurses working under nurse managers in inpatient wards in České Budějovice a.s. hospital. The questionaire was appropriately filled in by 112 nurses, corresponding 74,7% recoverability. This was used to complete the aim of this thesis. Results: Results of the thesis were divided into two sets. The first set of questions aimed on leader empowering behaviours of managers under whom the questioned nurses of particular departments work. Democratic empowering behaviours were evaluated the most used, according to the first hypothesis. The second set of questions aimed on satisfaction with work conditions. The highest job satisfaction was reached with democratic empowering behaviours. Autocratic, liberal and nonspecific empowering behaviours were used in minimal degree and nurses reported lower job satisfaction among these behaviours. Therefore the second hypothesis was also confirmed. Conclusion: The research pointed out that leader empowering behaviours are one of the factors that influence job satisfaction. It is positive thing that an interest and research in this area increased in the last decade. Periodic evaluation of job satisfaction enables monitoring the direction of its values. According to the survey, a newsletter with recommendations for nurse managers was formed. This newsletter pointed out pros and cons of leader empowering behaviours.
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