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Realizations of mathematical model of wind turbulations as lumped electronic circuits
Bürger, David ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
This semester work deals with implementation of the mathematical model known as modified Lorenz system as an electronic circuit with lumped parameters. Dynamical system is autonomous, deterministic and is described by a set of first-order ordinary differential equations. Our aim is to derive three different circuitry realizations each having specific properties. In the first case realization is canonical in the sense of the integrator block conception where the internal system parameters are adjusted by three potentiometers. Second realization represents modification towards independent adjustment of all four system parameters and, consequently, to tracing dynamical evolution of model solution. Last oscillator, on the contrary to previous circuits, work in current mode rather than voltage regime.
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L-band frequency converter for reception of the digital meteorological images
Bürger, David ; Frydrych, Jiří (referee) ; Záplata, Filip (advisor)
Down converter is a mixer which have a three ports. Two ports are refered as input ports and one port is ouput. One input port is connected to a signal which is transmited by meteorological satellites at frequency 1,7 GHz this frequency falls within the L–band. Meteorogical images are trasmited in L-band. The second input port is connected to a local oscillator in this case voltage control oscillator. The output signal includes sum and differential products, for down conversion is logically used differential product. Down conversion is used to convert data that are transmitted at high frequency to lower frequency which can be futher processed and then displayed data on the end device.
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Řízení zásob ve vybraném podniku
Burger, David
This bachelor thesis aims at evaluation and optimization of the process of managing stocks in a chosen business. The literary research depicts concepts like logistics, stocks, risks associated with stocks, costs arising from having stocks, as well as models of managing stock. In the second part of this thesis I describe the basic characteristics of a business and its current system of managing stock. The input data are divided into three categories according to the ABC analysis, based on their importance, subsequently after consulting the company management ten items are chosen, for which the optimal quantities are calculated which are then compared to the real conditions. Acquired findings are evaluated and based on that evaluation conclusion is drawn, or perhaps recommendations are given for optimizing the stocks in given business.
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L-band frequency converter for reception of the digital meteorological images
Bürger, David ; Frydrych, Jiří (referee) ; Záplata, Filip (advisor)
Down converter is a mixer which have a three ports. Two ports are refered as input ports and one port is ouput. One input port is connected to a signal which is transmited by meteorological satellites at frequency 1,7 GHz this frequency falls within the L–band. Meteorogical images are trasmited in L-band. The second input port is connected to a local oscillator in this case voltage control oscillator. The output signal includes sum and differential products, for down conversion is logically used differential product. Down conversion is used to convert data that are transmitted at high frequency to lower frequency which can be futher processed and then displayed data on the end device.
|
|
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Realizations of mathematical model of wind turbulations as lumped electronic circuits
Bürger, David ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
This semester work deals with implementation of the mathematical model known as modified Lorenz system as an electronic circuit with lumped parameters. Dynamical system is autonomous, deterministic and is described by a set of first-order ordinary differential equations. Our aim is to derive three different circuitry realizations each having specific properties. In the first case realization is canonical in the sense of the integrator block conception where the internal system parameters are adjusted by three potentiometers. Second realization represents modification towards independent adjustment of all four system parameters and, consequently, to tracing dynamical evolution of model solution. Last oscillator, on the contrary to previous circuits, work in current mode rather than voltage regime.
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