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Gpon Frame Database Design
Holik, Martin
This paper deals with design of a database for capturing and saving frames transmitted in downstream direction over gigabit passive optical network (GPON). This kind of system uses optical transfer over passive optical networks and therefore the architecture of network is different than Ethernet technology. The useful payload is encapsulated in GEM frames by using the gigabit encapsulation method. In this article, we describe basic principles of passive optical networks and a database model for saving GPON frames in the downstream direction captured by the field programmable gate array (FPGA) card. Next, the fundamental scripts for analysing physical layer operation, admission and maintenance (PLOAM) messages are discussed. Finally, a developed Python tool for advanced analysis is shown.
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Testing, routing and QoS in private networks
Opravil, Tomáš ; Holík, Martin (referee) ; Škorpil, Vladislav (advisor)
This thesis concerns the interaction of technologies of routing with ensuring the quality of services. It focuses on the function of routing protocols RIP and OSPF in combination with FIFO, PQ and WFQ queues of the technology DiffServ. The main output consists of two complex laboratory tasks. The first deals with theoretical research of the two mentioned above Riverbed programme technologies. The second subsequent task uses the emulator EVE-NG to aim the verification as well as deepening the acquired theoretical knowledge in practise.
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Design and implementation of xPON frame processing interface
Vais, Zdeněk ; Dejdar, Petr (referee) ; Holík, Martin (advisor)
This thesis focuses on system for persistence of GPON communication. Theoretical part deals with problems of GPON and NG-PON optical networks, NoSQL database systems and MongoDB database. Practical part contains design of a database schema for MongoDB database and source code in programming languages Python and C# for working with this database. The thesis is finalized by performance testing, proving that the database design and source code implementation is capable of handling real world traffic.
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Analysis of GPON frames using machine learning
Tomašov, Adrián ; Horváth, Tomáš (referee) ; Holík, Martin (advisor)
Táto práca sa zameriava na analýzu vybraných častí GPON rámca pomocou algoritmov strojového učenia implementovaných pomocou knižnice TensorFlow. Vzhľadom na to, že GPON protokol je definovaný ako sada odporúčaní, implementácia naprieč spoločnosťami sa môže líšiť od navrhnutého protokolu. Preto analýza pomocou zásobníkového automatu nie je dostatočná. Hlavnou myšlienkou je vytvoriť systém modelov za použitia knižnice TensorFlow v Python3, ktoré sú schopné detekovať abnormality v komunikácií. Tieto modely používajú viaceré architektúry neuronových sietí (napr. LSTM, autoencoder) a zameriavajú sa na rôzne typy analýzy. Tento systém sa naučí na vzorovej vzorke dát a upozorní na nájdené odlišnosti v novozachytenej komunikácií. Výstupom systému odhad podobnosti aktuálnej komunikácie v porovnaní so vzorovou komunikáciou.
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Numerical Simulation of Compressible Flow in Complex Domain
Holík, Martin ; Dolejší, Vít (advisor) ; Felcman, Jiří (referee) ; Sobotíková, Veronika (referee)
This thesis deals with the theoretical analysis and practical applications of the hp discontinuous Galerkin method for convection-diffusion problems. At first, we apply this method to a scalar non-stationary convection-diffusion equation with nonlinear convective as well as diffusive terms which represents a model problem for the solution of the system of the compressible Navier-Stokes equations describing a motion of viscous compressible fluids. The resulting, fully discrete schemes, where the time discretization is done by backward difference formula, including symmetric, non-symmetric and incomplete variants of stabilizations are theoretically analyzed. Under additional assumptions on mesh, regularity of exact solution and nonlinear convective and diffusive terms, we derive hp a priori error estimates for the DG-BDF method of the second order in time, which are optimal in the L2(H1)-seminorm and suboptimal in the L(L2)- norm. Further, we extend the concept of the discontinuous Galerkin method to the compressible Navier-Stokes equations, incorporating a semi-implicit discretization with respect to time which leads to the solution of a sequence of linear algebraic systems. We develop an efficient strategy for the solution of these acquired systems. It is based on a simple adaptive technique for the choice...
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GPON Frame Detection System
Holík, Martin ; Münster, Petr (referee) ; Horváth, Tomáš (advisor)
This diploma thesis deals with GPON frame detection system. Partial problems of designing databases, optical networks and management of database system are described in theoretical parts. Practical parts this thesis are focused on design of system for detecting GPON frames and script for analysing of traffic.
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The concept, types and modes of awarding public procurement contract
Holík, Martin ; Plíva, Stanislav (advisor) ; Horáček, Vít (referee)
11. SUMMARY Public procurement contracting in the Czech Republic is carried out according to the Act on public procurement. Contracting authorities of public procurements are entities of public law (state, region, municipality or another legal person of public law) as well as private persons if they order contracts paid by a public contracting authority at least by one half (that means subsidised contracting authorities) or carry out the so-called relevant activity (that means sector contracting authorities). The Act on public procurement regulates the actual contracting as well as supervision above contracting. Contracting is one of six types of contracting process. It is about a pre-contracting process that must be kept before entering into a contract by each entity, which is a contracting authority of public procurement. Supervision above contracting is done by the Office for the Protection of Competition. We divide public procurements according to the subject of fulfilment and also according to the expected value. If it is according to the subject of fulfilment, these are public procurements above the limit, under the limit and small scope ones. If it is according to the expected value, these are public procurements for services, supplies and construction works. Public procurements are paid from public...
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