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Measuring of data communication parameters in computer networks
Šeda, Pavel ; Hošek, Jiří (referee) ; Skořepa, Michal (advisor)
Master‘s thesis is focused on basic characteristics of data transmissions in computer networks. In forepart I digestedly described basic characteristics computer networks, metods of their measurement and valuation. Computer networks type LAN as well as wireless computer networks Wifi, are mentioned. In second part I realized my own proposition of basic characteristics measurement. This proposition is used for SW applications development. Main goal of these applications is measurement of packet delay, packet jitter, paket loss and available bandwidth. I described details of SW applications and realized measurement of real computer networks in the end.
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Aversion of the consumer/investor to loss
Svorad, Michal ; Chládek, Libor (referee) ; Škapa, Stanislav (advisor)
This Masters thesis analysis attitude and behavior of consumer in a role of investor in financial market to the loss or how to avoid the risk of future losses .In the theoretical part describes the theory needed to understand the other part, here in after referred to as tools and methods that are used to reduce the risk of loss.
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A System for Monitoring Status of Network Links via SNMP
Zubčák, Peter ; Trchalík, Roman (referee) ; Rychlý, Marek (advisor)
The goal of the bachelor thesis is an implementation of the system for monitoring status of network links. System collects information from network nodes, from which calculates metrics and statistics, which are available for users in MIB. The communications with network nodes is proceeded by SNMP protocol. The system is implemented in C++ language as a multiplatform service.
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Calculation of the cooling of the asynchronous machine ANSYS CFX
Horálek, Lukáš ; Veselka, František (referee) ; Janda, Marcel (advisor)
The issue this master’s thesis discusses the cooling synchronous machines. Specifically, the calculation of cooling induction motor using the finite volume method. Using Autodesk Inventor will create a 3D model of a real electric machine, ie asynchronous motor and then ANSYS WORKBENCH perform system analysis CFX, based on the finite volume method. Furthermore, we realize the air speed measurements on a particular machine and the individual results obtained by measuring and calculating the actual compared with each other. The master’s thesis also deals marginally with closely related to it. For the same machine model, we apply the calculation of the temperature fields using the finite volume method and them perform a thermal analysis. Next, we can carry out the measurement of the temperature on the motor itself and calculate the measured values and the measured compare each other.
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I Live Tarot
Oplatková, Hana ; Vondřejcová, Silvie (referee) ; Klímová, Barbora (advisor)
Private deck of cards created during six-month survey and documentation of daily experiences. The package contains 49 cards and it is inspired by a set of 78 tarot cards. Text content - reverse side of the card was created using diary notes. Face side of the card was chosen as a representation of processes taking place usually in days when the card was read.
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Temperature measurement of an asynchronous motor
Bartoň, Petr ; Deeb, Ramia (referee) ; Janda, Marcel (advisor)
In this thesis there are described methods which are used in order to measure a temperature in electric machines. Whereas there is an influence of magnetic field and mechanical effects in the electric machines it is possible to use only limited number of methods for measuring temperature. These methods can be divided into two basic groups. The first group is being called "contact measurement" and while the second one is "non-contact measurement". Contact measurements are performed by usage of resistant sensors or thermocouples. On the other hand, non-contact measurements are performed by pyrometers and thermal imager cameras. Theoretical values of warming are determined by the FEMM which operates on the basis of the finite element method. In the practical part there are compared several methods whereby asynchronous engine was measured at various loads. Measured values are compared with theoretical values.
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Indirect torque measurement in the output of load drive
Jelének, Marek ; Cipín, Radoslav (referee) ; Ondrůšek, Čestmír (advisor)
For loading of excavator drive units, it is necessary to use electromechanical loads with a high torque up to 16,000 Nm in a low speed range from 0 to 150 min-1 with a maximum output of 50 kW. The electromechanical load consists of an asynchronous dynamometer assembly with a tilting torque measurement system in conjunction with a front three-speed gearbox. The dynamometer is powered by a converter with vector control. To determine the torque at the gearbox output, a correction must be made and the influence of operating temperature and operating speed must be taken into account. Experimental measurement of these influences and dependencies makes it possible to create a mathematical model that can be implemented in the power converter for torque control at the output of the gearbox. The aim of the master thesis is a brief design of the loading drive, design an implementation of experimental measurement of efficiency maps and evaluation of the influence of inefficiency of gearbox efficiency.
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Model E-auction for the Company
Gazdíková, Pavla ; Zmrzlík, Tomáš (referee) ; Dvořák, Jiří (advisor)
The Master’s thesis in it’s introductory parts deal with theoretic piece of knowledge from areas internal Internet purchase and E-auction. A second part of thesis is formed of a present condition of a company. In a third, the fundamental part, is submitted proposal solving of E-auction for the company Siemens Industrial Turbomachinery, Ltd.
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Efficiency improvement of single-phase induction motor
Bořil, Michal ; Mach, Martin (referee) ; Vítek, Ondřej (advisor)
The subject-matter of the Bachelor Thesis is increasing efficiency of a single-phase asynchronous motor. The thesis is divided into several parts and comprises information concerning the subject-matter. The first part deals with the theoretical principle of all rotary machines from three-phase motors to single-phase motors, describing the principle, design and functionality of these devices in detail. In the second part, a new motor model is designed on the basis of the label values of a specified asynchronous motor and adapted to have the highest possible efficiency. The model of the motor is created in the ANSYS RMxprt program and compared to a model of the specified motor, which is also created on the basis of parameters of the technical documentation in the same program. In the last but one part of the Bachelor Theses, several models are created with proposed modifications of the motor to increase efficiency and compared to the specified motor. This part focuses on an analysis of individual types of losses that influence the efficiency and power of the motor. In the last part of the Bachelor Thesis, in the ANSYS Maxwell program, a model of the specified motor and a model of the motor with the highest efficiency is simulated with the use of FEMM. The obtained information of the models from the Maxwell program is compared to information obtained from the RMxprt program and evaluated.
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Aversion of the Consumer/Investor to Loss
Mazánek, Lukáš ; Chládek, Libor (referee) ; Škapa, Stanislav (advisor)
In this diplom thesis I will deal with relation between consumer and his aversion to loss. Expression of the potential risks that can describe using behavioral theories and psychological approach. The practical part will focus on the description of risk in consumers behavior as an investor. The relationship of these consumers lose due to amount of their income and practical recommendations on how to take into account the potential risks and minimize loss.
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