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Neural network for style transfer
Kadlec, Filip ; Matoušek, Radomil (referee) ; Hůlka, Tomáš (advisor)
In this bachelor’s thesis we describe machine learning, types of artificial neural networks and internal processes of neural networks, such as feedforward data processing and training neural networks. We are also pursuing comparison and description of libraries (such as TensorFlow and Keras), which are suitable for neural networks implementation. In the practical part of thesis, we are dealing with problem called artistic style transfer with convolutional neural network.
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Segmentation of cardiac muscle images acquired using confocal microscopy
Kadlec, Filip ; Shehadeh, Mhd Ali (referee) ; Škrabánek, Pavel (advisor)
Automatizace získávání a zpracování dat je dnes běžnou záležitostí jak v mikroskopii tak v počítačovém vidění. Ke klasifikaci a lokalizaci objektů zájmu (v tomto případě kardiomyocytů) lze užít segmentaci. V tomto konkrétním případě byla aplikována sémantická segmentace za užití hlubokých neuronových sítí jakožto hlavního prostředku k provedení zmíněné úlohy a byl vytvořen software umožňující jak zpracování neoznačených dat, tak trénování modelů neuronových sítí na označených datech. Tato práce krátce hovoří o optické mikroskopi, detailně popisuje segmentaci a hluboké učení a na závěr poskytuje popis procesu od přípravy dat, přes implementaci a trénování neuronových sítí, k vytvoření konečného softwaru. Tento software usnadní a zefektivní práci výzkumníků poskytnutím pouze relevantních dat pro výzkum, pomůže automatizovat sběr mikroskopických snímků a s menším upravením může být aplikován na další obdobné segmentační úlohy.
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Segmentation of cardiac muscle images acquired using confocal microscopy
Kadlec, Filip ; Shehadeh, Mhd Ali (referee) ; Škrabánek, Pavel (advisor)
Automatizace získávání a zpracování dat je dnes běžnou záležitostí jak v mikroskopii tak v počítačovém vidění. Ke klasifikaci a lokalizaci objektů zájmu (v tomto případě kardiomyocytů) lze užít segmentaci. V tomto konkrétním případě byla aplikována sémantická segmentace za užití hlubokých neuronových sítí jakožto hlavního prostředku k provedení zmíněné úlohy a byl vytvořen software umožňující jak zpracování neoznačených dat, tak trénování modelů neuronových sítí na označených datech. Tato práce krátce hovoří o optické mikroskopi, detailně popisuje segmentaci a hluboké učení a na závěr poskytuje popis procesu od přípravy dat, přes implementaci a trénování neuronových sítí, k vytvoření konečného softwaru. Tento software usnadní a zefektivní práci výzkumníků poskytnutím pouze relevantních dat pro výzkum, pomůže automatizovat sběr mikroskopických snímků a s menším upravením může být aplikován na další obdobné segmentační úlohy.
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Investigation of spin polarization in semiconductors by laser spectroscopy
Butkovičová, Dagmar ; Němec, Petr (advisor) ; Kadlec, Filip (referee)
This work is devoted to the investigation of a spin polarization in ferromagnetic semiconductor Ga1-xMnxAs with a broad nominal concentration of manganese ions using one method of the ultrafast laser spectroscopy - the time-resolved Kerr rotation. At first, the experimental setup was optimized for the investigation of the dynamics of spin polarized charge carriers in semiconductors which were photo-generated by circularly polarized laser pulses. It was observed that the measured signal is induced by spin-polarized electrons. Due to a small thickness of the investigated ferromagnetic films the measured signal probably monitored the dynamics of fotogenerated electrons in GaAs substrate. Nevertheless, the measured data show that the electron spin dynamics in the substrate is significantly influenced by proximity effect due to the deposited ferromagnetic layer.
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Development and applications of near-field imaging methods in the terahertz spectral domain
Berta, Milan ; Kadlec, Filip (advisor) ; Fejfar, Antonín (referee) ; Adam, Auréle J.L. (referee)
We are reporting on a study of the near-field sensitivity and resolution of a metal-dielectric probe (MDP). The propagation of the electromagnetic field across the probe was studied experimentally by means of time-domain terahertz spectroscopy and numerically simulated by CST MicroWave Studio 2008. Several localised areas at the probe end facet were distinguished and showed to be sensitive to the local dielectric properties and local anisotropy of the sample. Contrast and sensitivity measurements were conducted in several configurations of a MDP; the results were confirmed by simulations. The acquired data were analysed by using singular value decomposition that enabled separating independent physical phenomena in the measured datasets and filtering external disturbances out of the signal. Independent components corresponding to the changes in the output terahertz pulse upon varying the probe-sample distance and reflecting the local anisotropy in a ferroelectric barium titanate (BaTiO3) crystal were extracted and identified. The domain structure with characteristic dimensions of about 5 um was resolved during imaging experiments on the ferroelectric BaTiO3 sample, i.e. the resolved structures were ten times smaller than the characteristic dimensions of the end facet of the probe and forty times smaller than...
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Neural network for style transfer
Kadlec, Filip ; Matoušek, Radomil (referee) ; Hůlka, Tomáš (advisor)
In this bachelor’s thesis we describe machine learning, types of artificial neural networks and internal processes of neural networks, such as feedforward data processing and training neural networks. We are also pursuing comparison and description of libraries (such as TensorFlow and Keras), which are suitable for neural networks implementation. In the practical part of thesis, we are dealing with problem called artistic style transfer with convolutional neural network.
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Long-term effects of self-therapeutic workbook "A Workbook To Increase Your Meaningful And Purposeful Goals"
Kadlec, Filip ; Hnilica, Karel (advisor) ; Smetáčková, Irena (referee)
This bachelor's thesis is focusing on verification of effectiveness of self-therapeutic manual "A Workbook To Increase Your Meaningful And Purposeful Goals" (in Czech "SUC Manuál"). Theoretical part presents nowadays theories in fields connected with philosophy of Manual - hedonic and eudaimonic theories of well-being by Diener and Ryff, Schwartz's value theory, model of self-concordant goals by Sheldon, and concept of self-help and writing in psychotherapy. Manual was translated into Czech language and afterwards administered to three experimental groups, while each of group had a "shadow" control group. All groups were tested at the beginning and at the end of experiment with battery of tests including SPANE, SWLS and MLM. Main hypothesis assumed that experimental groups will show increase in eudaimonic well-being even over ten weeks after finishing Manual. Following analysis of data shown increase of eudaimonic well-being and stagnancy of hedonic well-being in experimental groups, while control groups shown any changes neither eudaimonic, nor hedonic well-being. KEY WORDS meaning, purpose, values, goal, self-therapy, logotherapy, long-term effect, effectiveness
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Investigation of spin polarization in semiconductors by laser spectroscopy
Butkovičová, Dagmar ; Němec, Petr (advisor) ; Kadlec, Filip (referee)
This work is devoted to the investigation of a spin polarization in ferromagnetic semiconductor Ga1-xMnxAs with a broad nominal concentration of manganese ions using one method of the ultrafast laser spectroscopy - the time-resolved Kerr rotation. At first, the experimental setup was optimized for the investigation of the dynamics of spin polarized charge carriers in semiconductors which were photo-generated by circularly polarized laser pulses. It was observed that the measured signal is induced by spin-polarized electrons. Due to a small thickness of the investigated ferromagnetic films the measured signal probably monitored the dynamics of fotogenerated electrons in GaAs substrate. Nevertheless, the measured data show that the electron spin dynamics in the substrate is significantly influenced by proximity effect due to the deposited ferromagnetic layer.
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Development and applications of near-field imaging methods in the terahertz spectral domain
Berta, Milan ; Kadlec, Filip (advisor) ; Fejfar, Antonín (referee) ; Adam, Auréle J.L. (referee)
We are reporting on a study of the near-field sensitivity and resolution of a metal-dielectric probe (MDP). The propagation of the electromagnetic field across the probe was studied experimentally by means of time-domain terahertz spectroscopy and numerically simulated by CST MicroWave Studio 2008. Several localised areas at the probe end facet were distinguished and showed to be sensitive to the local dielectric properties and local anisotropy of the sample. Contrast and sensitivity measurements were conducted in several configurations of a MDP; the results were confirmed by simulations. The acquired data were analysed by using singular value decomposition that enabled separating independent physical phenomena in the measured datasets and filtering external disturbances out of the signal. Independent components corresponding to the changes in the output terahertz pulse upon varying the probe-sample distance and reflecting the local anisotropy in a ferroelectric barium titanate (BaTiO3) crystal were extracted and identified. The domain structure with characteristic dimensions of about 5 um was resolved during imaging experiments on the ferroelectric BaTiO3 sample, i.e. the resolved structures were ten times smaller than the characteristic dimensions of the end facet of the probe and forty times smaller than...
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