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Autonomous circuit analysis using Matlab
Zmeškal, Ladislav ; Jeřábek, Jan (referee) ; Koton, Jaroslav (advisor)
This bachelor’s thesis will deal with the creation of a description of a program for symbolic calculation of transfer function circuit, circuits, consisting of base current conveyors and admittance. In the theoretical part describes algorithmic methods analysis circuit together with the general characteristics of the current conveyor and a brief description of the program Matlab. The second part will describe the function created program, its parts, and specific examples of calculation of transfer functions. The last part of the validation of the results program created in MATLAB with the results of the SNAP program.
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Interactive Processing of Volumetric Data
Kolomazník, Jan ; Pelikán, Josef (advisor) ; Czanner, Silvester (referee) ; Dokládal, Petr (referee)
Title: Interactive Processing of Volumetric Data Author: Jan Kolomazník Department: Department of Software and Computer Science Education Supervisor: RNDr. Josef Pelikán, Department of Software and Computer Science Education Abstract: Interactive visualization and segmentation of volumetric data are quite lim- ited due to the increased complexity of the task and size of the input data in comparison to two-dimensional processing. A special interactive segmentation workflow is presented, based on minimal graph-cut search. The overall execution time was lowered by implementing all the computational steps on GPU, which required a design of massively parallel algorithms (using thousands of threads). To lower the computational burden even further the graph is constructed over the image subregions com- puted by parallel watershed transformation. As a suitable formalism for a range of massively parallel algorithms was chosen cellular automata. A set of cellular automata extensions was defined, which allows efficient mapping and computation on GPU. Several variants of parallel watershed transformation are then defined in the form of cellular automaton. A novel form of 2D transfer function was presented, to improve direct volume visualization of the input data, suited for discriminating image features by their shape and...
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Frequency and modal spectrum of planet gearing Wikov
Půst, Ladislav ; Pešek, Luděk ; Radolfová, Alena
This report is a continuation of previous publications edited within the cooperation between Wikov Gear, s.r.o and IT ASCR and oriented on investigation of dynamic properties of four-planetary gearing box with fixed carrier of planet gears. Linear computing model of dynamic behaviour of gearing box is based on the assumption of solid gearing’s wheels, constant stiffness of bearings and of planets’ pins. Also the contact stiffness in gearings are supposed to be constant with the mean value. Due to the vide helical gearing with manifold contacts the periodical variability of contact stiffness is neglected. The very week support of sun wheel and elastic supports of planets and ring wheels results in the general plane motion of all wheels.\nStructural periodicity of four-planetary gearing results in existence of several multiple eigen-frequencies in frequency spectrum. As the gearing box works always in connection with other aggregates, the simple models of driving and breaking systems were jointed to the input and output shafts. Eigen-frequency spectrum corresponding modes of vibrations and transfer functions among all elements were ascertained for this 20 DOF system. Numerical computing is completed by graphical records of eigen-modes as well as of transfer functions. \n
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Palaeoecological reconstruction of Komořany Lake in Late Glacial based on diatom analysis
Poštulková, Anna ; Nedbalová, Linda (advisor) ; Tátosová, Jolana (referee)
Diatom analysis of basal part of profile PK-1-L contributes to multi-proxy research of former Lake Komořany. At this part of profile radiocarbon dating (dates sediments into Late Glacial and Early Holocene) and LOI (loss on ignition) had been conducted before, of which results have been utilized to more accurate interpretation of diatom analysis conclusions. Apart from diatom valves, presence of stomatocysts of Chrysophyceae has been observed. Having separated diatom valves from 32 sediment samples in intervals 0,4-0,6 cm, permanent preparates have been created. Concentration of valves in a gramme of dry sediment and relative abundance of diatom taxons in each sample have been investigated using light microscopy. In a half of samples subdominants and rare taxons have been observed separately to eliminate the interference from dominant taxons. Cluster analysis based on relative abundances of diatom taxons have been calculated and on its results have been subsequently determined three diatom accumulation zones (DAZ). Moreover trophic and saprobic indices have been calculated and levels of pH, conductivity and concentration of total phosphorus (TP) have been estimated by transfer functions. Even before beginning of Holocene the major shift in composition of diatom communities have happened, to the...
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Multidimensional transfer functions for scalar volumetric data visualization
Mach, Pavel ; Kolomazník, Jan (advisor) ; Dupej, Ján (referee)
Direct volume rendering is an algorithm used for displaying three-dimensional scalar data, like image from Computed Tomography. This algorithm makes use of a concept of Transfer functions for assigning optical properties to the data values. We studied two dimensional transfer functions, that besides primary values have additional dataset as an input. In particular, we studied computation of this secondary dataset with respect to the primary image function shape. This was done by analysing eigenvalues of the Hessian matrix in each image point. We proposed one formula and implemented several others for computing the probability that image point belongs to the blood vessel. Powered by TCPDF (www.tcpdf.org)
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Autonomous circuit analysis using Matlab
Zmeškal, Ladislav ; Jeřábek, Jan (referee) ; Koton, Jaroslav (advisor)
This bachelor’s thesis will deal with the creation of a description of a program for symbolic calculation of transfer function circuit, circuits, consisting of base current conveyors and admittance. In the theoretical part describes algorithmic methods analysis circuit together with the general characteristics of the current conveyor and a brief description of the program Matlab. The second part will describe the function created program, its parts, and specific examples of calculation of transfer functions. The last part of the validation of the results program created in MATLAB with the results of the SNAP program.
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