National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Employing GPU to Process Data from Electron Microscope
Bali, Michal ; Kruliš, Martin (advisor) ; Šikudová, Elena (referee)
Electron backscatter diffraction (EBSD) is a common tool used by phy- sicists to examine crystalline materials, which is based on taking pictures of material microstructure using electron microscope. To determine additional characteristics of studied specimen, a specific variant called High resolution EBSD has been proposed (and partially adopted). The technique takes se- veral subregions of the images taken by the EBSD camera and uses cross- correlation to measure deformation of obtained patterns. Usability of this method is limited by its relatively high computational complexity, which makes it useless for the analysis of larger specimen surfaces. At the same time, processing of individual subregions and images is independent, which makes it appropriate for parallelization provided by modern GPUs. In this thesis, we describe the technique used to process the EBSD data in detail, analyze it and implement the most computationally demanding parts using the CUDA technology. Compared to a reference Python implementation, we measured a speedup of 30-40-times when using a double floating precision and up to a 270-times speedup for a single precision.
Plánovač síťového provozu pro diferencované služby
Bali, Michal ; Kratochvíl, Miroslav (advisor) ; Matěna, Vladimír (referee)
Service differentiation, the ability of the QoS-providing mechanisms to sa- tisfy different requirements of different network traffic types, is an important part of the Internet service delivery. Usual methods of improving differen- tiated service QoS require centralized traffic scheduling, which on the other hand can not react to disturbances in transit network of typical ISPs. In this thesis we describe, implement and benchmark a traffic scheduler that is simple enough to be placed at the exact bottleneck of the network where it precisely reacts to network problems; at the same time it supports a multi-flow multi-priority stochastical traffic scheduling that guarantees a level of fairness and service differentiation. The design is built on previous research in the area - it combines the ideas of CoDel with SFQ. We implement the resulting traffic scheduler, called Multilevel Stochasti- cally Fair CoDel (MSFC), in the ns-3 network simulator. Benchmarks on a simulated ISP-like network show improvements in QoS of the differentiated services in comparison with other non-centralized classless traffic schedulers.

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