National Repository of Grey Literature 16 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
River regulation and design of flood protection
Gřegoř, Adam ; Julínek, Tomáš (referee) ; Duchan, David (advisor)
The bachelor’s thesis deals with designing flood protection on the watercourse Velička (tributary of the river Bečva), which is situated in the area of Hranice municipality. The flow modelling was done as 1D surface water HEC-RAS model. Two options of flood protection were designed based on the size of the flood areas that occured during flood flows Q5, Q20 and Q100. The first option did not consider the usage of Lhotka dry pond. The second option considered the usage of Lhotka dry pond, which was designed in the study made by AgPOL s.r.o. firm to the north of Hranice and which transforms flood flows. The result of the bachelor’s thesis are maps of flood areas that occured during the flood flows Q5, Q20 and Q100 after the implementation of flood protection options. In conclusion, the suitability of the flood protection options is evaluated.
Research of the influence of a new method for ball-attach process on BGA packages on intermetallic layers
Gregor, Adam ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This work deals with exploring a new method of ball-attach process on BGA packages using a directly heated stencil. The existing procedures of making solder bumps were compared with possible benefits of using this new method. The methodology was established to create samples using a new reflow method and its effect on the formation and strength of intermetallic layers of solder bumps, due to the set height of the heated template, which was designed for reflow of BGA terminals. In addition to the design of the methodology, shear tests and metallographic sections of the samples were also performed. The thickness of the intermetallic layer and its roughness were examined. An evaluation of the results was performed on the basis of which a new method of reflow soldering of solder balls on BGA packages was optimized.
Room Impulse Response Estimation from Speech Signal
Gregor, Adam ; Szőke, Igor (referee) ; Černocký, Jan (advisor)
Jakýkoliv zvuk šířící se místností je zkreslen impulsní odezvou této místnosti. Měření těchto impulsních odezev bylo vždy důležitou úlohou akustiky, která v dnešní době ještě nabyla na důležitosti, díky možnosti požití impulsních odezev při augmentaci dat pro účely trénování automatických rozpoznávačů řeči. Standardně je impulsní odezva místnosti měřena za pomoci čisté a zkreslené formy zvukového signálu. To je však v praxi nepraktické (například u domácích asistentů či chytrých domů), neboť zde je k dispozici jen zkreslený signál. Tato bakalářská práce se zabývá odhadem impulsní odezvy "naslepo, pouze pomocí zkresleného řečového signálu. Nejdříve jsme za použití datasetu BUT ReverbDB re-implementovali standardní techniky pro měření impulsní odezvy z čistého/zkresleného signálu. Poté jsme testovali dvě techniky odhadující impulsní odezvu místnosti pouze ze zkreslené řeči.  První technika k tomu používá impulsní fonémy ve zkreslené řeči, u kterých se předpokládá, že se podobají impulsním odezvám místností. Bylo testováno průměrování a dekonvoluce těchto fonémů za účelem zvýšení kvality a robustnosti odhadu. Druhá technika využívá regresní neuronové sítě generující impulsní odezvy místností z řeči na vstupu. Ačkoliv žádná z navrhovaných technik nedosahuje odhadů na úrovni standardních měření, mají tyto odhady potenciál při augmentaci dat pro trénování automatických rozpoznávačů řeči.
Research of reliability of solder ball terminals on BGA packages attached by innovative method
Gregor, Adam ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This master´s thesis deals with the investigation of the reliability and service life of solder bumps on BGA packages created using new method using directly heated stencil. The methodology of reliability tests using isothermal and cyclic thermal aging of solder ball terminals was proposed. Test samples of BGA packages were created using this new method of reflow solder bumps and then was statistically evaluated. The internal structure and crystallographic orientation of the planes were investigated.
Hydraulic analysis of the Bečva river
Gřegoř, Adam ; Smelík, Lukáš (referee) ; Duchan, David (advisor)
The subject of this diploma thesis is a comparison between two river hydraulics modeling approaches, the first one being combined 1D and 2D modeling, and the second one being solely 2D modeling. Both models are located at Bečva river, between its 17,282 and 28,419 river kilometer. The outputs of the simulations are water flow velocity maps, water depth maps, maps that show differences between flood areas calculated in both models, tables comparing channel water surface elevations and schematic long sections. In conclusion of the thesis, the outputs of the simulations are compared.
Vehicle Make and Model Recognition
Gregor, Adam ; Špaňhel, Jakub (referee) ; Juránek, Roman (advisor)
V praktické části diplomové práce byla realizována úloha ozpoznání výrobce a modelu vozidla (VMMR). V první části byla pro účely strojového učení sestavena datová sada vozidel sestávající se z obrázků z Internetu. Takto bylo získáno přes 6 milionů obrázků aut, autobusů, motorek a dodávek, použitelných pro úlohu VMMR. Dále byla v rámci ex- perimentů na část datové sady použita standardní klasifikace, kdy na enkodér navazuje klasifikační vrstva realizovaná použitím neuronové sítě, a přístup, kdy za pomocí metody supervised contrastive learning byly embeddingy z enkodérů shlukovány za účelem snazší klasifikace. Jelikož první uvedený přístup vracel přesnější výsledky, byl použit v dalších experimentech. V nich se použilo větší množství obrázků z naší datové sady k natrénování klasifikátoru pro VMMR. Další klasifikátory byly natrénovány na datových sadách Stan- ford Cars a Comprehensive cars. Posléze bylo při porovnávání funkčnosti klasifikátorů na různých datových sadách shledáno, že klasifikátor trénovaný na naší datové sadě si vedl nejlépe.
Revitalisation of the Chrudimka river
Rychlý, Patrik ; Gřegoř, Adam (referee) ; Duchan, David (advisor)
The diploma thesis deals with the hydraulic verification of the design of the millrace revitalization in the Chrudim town intravillage from the bachelor's thesis Úprava toku na vybrané lokalitě from 2021. The thesis describes the current flow state and the location of interest, the method of building a 2D hydraulic model, a description of changes in the proposed modification, and then a description of the hydraulic verification of the design. As a result of the thesis, the maps of a spill, depths, and velocities for flood flow Q5, Q20, and Q100, the proposed treatment, and sample cross sections are presented. The thesis concludes with an assessment of the effect of the modification on the existing flood condition.
Research of reliability of solder ball terminals on BGA packages attached by innovative method
Gregor, Adam ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This master´s thesis deals with the investigation of the reliability and service life of solder bumps on BGA packages created using new method using directly heated stencil. The methodology of reliability tests using isothermal and cyclic thermal aging of solder ball terminals was proposed. Test samples of BGA packages were created using this new method of reflow solder bumps and then was statistically evaluated. The internal structure and crystallographic orientation of the planes were investigated.
The Applicability of the JONSWAP Spectrum for Wave Events at Small Water Surfaces
Gřegoř, Adam
Task of the research was to determine whether the spectral density (i.e. spectrum) of wind wave events at Hulínská štěrkovna reservoir is the same as the JONSWAP spectrum, which was based at the wave events at partially developed sea. Data about the time course of the water surface elevation at reservoir were processed with use of the MATLAB and WAFO toolbox that was developed by the Lund University.
Research of the influence of a new method for ball-attach process on BGA packages on intermetallic layers
Gregor, Adam ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This work deals with exploring a new method of ball-attach process on BGA packages using a directly heated stencil. The existing procedures of making solder bumps were compared with possible benefits of using this new method. The methodology was established to create samples using a new reflow method and its effect on the formation and strength of intermetallic layers of solder bumps, due to the set height of the heated template, which was designed for reflow of BGA terminals. In addition to the design of the methodology, shear tests and metallographic sections of the samples were also performed. The thickness of the intermetallic layer and its roughness were examined. An evaluation of the results was performed on the basis of which a new method of reflow soldering of solder balls on BGA packages was optimized.

National Repository of Grey Literature : 16 records found   1 - 10next  jump to record:
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15 Gregor, Adam
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