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Network server performance when communicating with a great number of clients
Mašín, Jan ; Pelka, Tomáš (referee) ; Komosný, Dan (advisor)
The aim is to create a simulation system between two computers of the server-client type to generace the process to server while usany UDP protocol: to set different parameters of the generated process (size of paquet, interval of sending) and evaluace the server-sources consumption (memory), to work out the outcomes in a well-organized manner. There have been tested two servers (each of different output) and operational systéme Windows XP, Windows Server 2003, Linux Mandriva 8.0 and Linux Fedora 7, each of these had been installed on the servers with different outputs. The generated process is carried out with usaje of the paquet generator made in the programming language C++.Two different programmes needed have been created, one of them for klient(paquet generation in OS Windows), its aim is to generate the paquets, the sekond on efor server (functional version working in OS Linux had had to be made) receiving the generated paquets. Evaulation of the source-consumption was carried out by two monitoring programs, one of them suited for OS Windows, the other for OS Linux. Both programs safe the information about procesor-work and operational memory into a text dokument which is very simple and fast way for searching the information. The measured values show charts and graphs that express the efficiency of separate OSs or, in case of need, servers of different outputs are able to handle the generated paquets and how do the alterations of the paquet generator affect the source efficiency( paquet size and paquet-sending interval).
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Laboratory kit for demonstration of active low pass, high pass and band pass filter by Sallen-Key structure
Kadlec, Michal ; Smejkal, Vladimír (referee) ; Slezák, Josef (advisor)
The main aim of this work is to design electric circuit for realizing of low pass, high pass and band pass filter using Sallen – Key structure. It is active filter so this work pays attention to choose the suitable active element. I will analyze individual types of frequency filters, simulate designed structure and will choose suitable computing amplifier for our structure. I will simulate every circuit with ideal operational amplifier, with operational amplifier having real parameters and finally with our chosen operational amplifier. I will confront the difference of individual circuit, influence of real parameters of amplifier for the general process of resultant filter modul characteristics. I closer take a look at the output resistance influence of operational amplifier for the modul characteristics of choosen circuit (low pass filter). This project also includes the summary and analyses of individual possibilities of the electronic control applied to active filter parameters. The part of the project is also detailed analyze and process of realization of the final connection of laboratory instrument.
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Observation of non invasive and invasive screening cerebral vessels from the radiologic assistants view.
NOVOTNÁ, Dana
The subject my thesis was ? Observation of non invasive and invasive screening cerebral vessels from the radiologic assistants view". In the theoretical parts I explore the disorder of blood - vessel in cerebral occurrence (CMP) and its diagnosis. It is about the acute illness caused by closure of some of the cerebral arteries and resulting in vapidity brain (ischemic) or bleeding to the brain (haemorrhage). It ranks among the most frequent causes death in developed countries. The practical part includes research of usage non invasive and invasive depict methods in brain and cerebral vessels diagnostics. I processed quantitatively the statistical data which I gained from the Radio-diagnostic Ward in hospital in Ceske Budejovice. The result of this emerges from superiority of non-invasive screening above invasive one. In the non- invasive depict methods in diagnosis of CMP most often uses computation tomography (68 %), which for a certainty will distinguish ischemic from haemorrhage. Magnetic resonance (7 %) is more sensitive method at ischemic diagnostics. Another method is the ultra-sonography (13 %), in which we can assess the level of stenos/occlusion screened vessel. As the only vice invasive methods is catetrizac angiography (12 %), which is considered as the golden standard in displaying the blood - vessel bed. Its advantage is the possibility to join endovascular intervention. The next aim was to compare the role of radiologic assistant during single screening. It was necessary to find common point in practical activities of the radiologic assistant at both types o screening and to show the differences in specific substance and the work demands.
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Calculation of the Credit Value at Risk
Zamazal, David ; Mandl, Petr (referee) ; Benková, Markéta (advisor)
Thesis describes calculation of the credit value at risk for portfolio composed of traditional bank loans. The risk is measured by incurred expected and unexpected losses at the end of some time horizon. Thesis is splitted into two parts - theoretical part and computational part. The most known and most widely used models are described in the first part, in conjunction with definition of their main input parameters - probability of default, exposure at default, loss given default and correlation between debtors. Detailed theoretical description of two chosen methods comes after - CreditMetrics method and Vasicek's method. The examined portfolio is characterized in the computational part, along with other input parameters, essential for evaluation. Then model implementation into software Mathematica is described, evaluation run and the results. Eventually both methods are compared.
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Minimum Weight Triangulation (MWT)
Charvát, Pavel ; Kolingerová, Ivana (advisor) ; Ferko, Andrej (referee)
For a long time, it has been neither known whether MWT is solvable in a polynomial time nor whether it belongs to NP. As we now, its status still remain unknown. We present severalknown approaches to MWT such as modifications of the problem with known time complexity or various heuristics and approximations which allow us to find an exact or at least an approximate solution in a reasonable time. We compare the approximations in some particular situations. The main part of the work is devoted to a description and implementation of an efficient heuristic with (almost?) linear expected complexity for points uniformly distributed in some convex shape. The algorithm is a modification of Drysdale's algorithm for finding GT candidates and Beurouti's computation of the modified LMT-skeleton, where we add some proofs of the correctness. We are able to complete MWT from the graph of candidate edges in O(n · d3 + n · d2+k), where d is the the maximum degree and k is the maximum number of inner components of some skeleton face. Further, we suggest a new approximation of MWT with polynomial complexity in the worst case and (almost?) linear expected complexity, which only rarely differs from the optimal triangulation and has O(1) approximation factor in the worst case. This approximation combines the LMT-skeleton...
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Controled laboratory voltage suplier
Vít, Tomáš ; Valach, Soběslav (referee) ; Macho, Tomáš (advisor)
The aim of my master’s thesis is the design and implementation of laboratory power supply with output parameters 0-25V and 0-2A and options to manage this resource by elements of the front panel or via a computer control program. Content is the theoretical analysis of the possibility of subsequent theoretical sources suggesting that it verified on the prototype laboratory resources.
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Design of high voltage source for electrical ageing of insulating mater
Příborský, Václav ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
Target of this thesis is analyse problems of dielectric materials ageing and environment characteristic applied by ageing process. Types of electric stress are comparing in this work, when and how they are working and how to eleminate them. Next aim is design the high voltage sinus transformer as source for measuring of electric stress and ageing dielectric materials. There is discuss about computer control and collecting of the output datas. In the end is source testing by practical measurement of some dielectric samples.
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Multichannel instrumentation for electrochemical measurement from sensor array
Žák, Jaromír ; Kizek, René (referee) ; Hubálek, Jaromír (advisor)
The work deals with n-channel system enabling many sample analysis at sort time from sensor array using electrochemical methods. The 8x12 sensor arrays are formed from 3 electrodes system created on PCB which can be used for heavy metal analysis and toxic substances determination. The control unit switches each 3 electrode sensor to 8 channel precise potentiostat which was designed for electrochemical analysis with current sensitivity below 10 pA. The potentiostat can synchronize with control unit. Developed system is able to measure up to eight single inputs and may be simply converted to measure other nonchemical values. Measured data will be sent to user-friendly application in computer and analyzed or saved consequently.
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Driven roller conveyor
Kubín, Michal ; Kašpárek, Jaroslav (referee) ; Jonák, Martin (advisor)
This bachelor thesis deals with the computational and structural design driven horizontal roller conveyor with a length of 100 meters, for transporting plastic material on plastic pallets or in plastic pallets boxes with a maximum load weight 200 kilograms, in the context of internal factory transport. Part of this thesis is functional calculation for the roller conveyor, identifying the main dimensions of the roller conveyor, strength calculations of the casing and the shaft driven roller and implementation of the proposal and check the frame of the conveyor. The appendices contained drawings for the horizontal driven roller conveyor.
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Choosing an antivirus program
David, Jan ; Pícka, Marek (advisor) ; Hanzlík, Petr (referee)
This bachelor thesis is focused on choosing a free antivirus software for basic internet usage on a personal computer.
The first part focuses on the issue of malicious software and is divided into categories based on various viewpoints. In addition, several types of prevention are mentioned. This part also explains the history of antivirus software.
The second part contains the actual comparison of five freeware antiviruses. Selection of these five programs is based on a survey. The test consists of five criteria: time of computer deep scan, disc usage, memory usage, user interface and safety rating by AV-Test. These criteria are weighted using Saaty method and the final result is calculated using a weighted sum method.
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