National Repository of Grey Literature 183 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Integrating Real-Environment 4G and 5G Mobile Data Patterns into Network Simulations for Delay Analysis
Kolackova, Aneta ; Jerabek, Jan ; Hosek, Jiri
This article presents a simulation testbed for analyzinga mobile transport network using open-source networkingtools and protocols. The topology was designed according to the5G transport network architecture, with Segment Routing forIPv6 (SRv6) technology and The Fast Data Project Vector PacketProcessor (FD.io VPP) utilized for packet processing. The Trextraffic generator was used to simulate data transmission, andthe Docker platform enabled centralized access and managementof the topology. Real data patterns collected from one cell sitewas inserted into the created topology to create output forfuture research. The created testbed provides a valuable toolfor analyzing the mobile transport network’s performance andfuture optimizing based on needs of network slices.
Access and Backhaul Solutions for Cellular-Enabled Industrial Wearables
Saafi, Salwa ; Bečvář, Zdeněk (referee) ; Tölli, Antti (referee) ; Hošek, Jiří (advisor)
Smartphones are no longer the only portable devices changing the lives and daily routines of today’s digitally connected consumers. Smart glasses, watches, headsets, cameras, bands, trackers, monitors, and scanners are all examples of hands-free inherently mobile wearable devices that enable the emerging consumer and industrial applications. Similarly to customers who are ready to embrace life-changing experiences with new devices, companies and industries are also employing smart helpers and intelligent assistant systems to improve the efficiency of their automated processes and the productivity and safety of their workers. Not limited to the employment of smart helpers, the industrial digital transformation relies heavily on the deployment of communication infrastructures that utilize efficient cellular technologies to meet the dissimilar requirements of industrial applications. Motivated by these intelligent assistant systems and communication technologies, this dissertation focuses on the role of wearable technology and cellular connectivity in enabling the automation of vertical domains. Aiming to address the current technology gap behind cellular-enabled industrial wearables, the present work is dedicated to assessing the applicability of cellular connectivity to industrial wearables and developing efficient access and backhaul solutions for the support of the requirements of emerging industrial applications. The following outline of this dissertation is built around the main objectives as highlighted above and presents the main outcomes of this work, which include (i) a concise technology review capturing the evolution of the recent solutions proposed by the 3rd Generation Partnership Project (3GPP) for wearable devices and communications, (ii) an introduction to novel categories of industrial wearable applications with mid-end requirements that fall in-between the two extremes of high-end and low-end Fifth-Generation (5G) service classes, (iii) an assessment of the applicability of the emerging Reduced-Capability New Radio (NR RedCap) technology to the newly introduced wearable applications, (iv) an extension of the RedCap wearable communications with Device-to-Device (D2D) and Supplementary Uplink (SUL) capabilities for enhanced access network performance, (v) a cost-efficient backhaul selection solution based on Markov Decision Processes (MDPs) for time-sensitive wearable applications in an integrated terrestrial and non-terrestrial communication scenario, and (vi) a data-driven Artificial Intelligence (AI)-aided approach for the management of complex industrial networks with dissimilar device capabilities, communication solutions, and application requirements. A set of simulation and analytical models is developed to assess the relevant key performance indicators as part of the above contributions. Beyond indicating the need for technology improvement demanded by the efficient integration of wearable devices into cellular networks and the satisfaction of industrial application requirements, the numerical results reported in this dissertation confirm the network performance enhancements achieved by the access and backhaul solutions contributed in this work.
Optimization of Wireless Networks Infrastructure Using Artificial Intelligence Methods
Šeda, Pavel ; Assoc. Prof. Sergey Andreev, D.Sci. (Tech.) (referee) ; Araniti, Giuseppe (referee) ; Hošek, Jiří (advisor)
Dizertační práce je zaměřená na úlohy optimalizace síťových infrastruktur s využitím algoritmů umělé inteligence. Vzhledem k rostoucím požadavkům na síťový provoz v 5G+ sítích jsou nutné zásadní úpravy síťových infrastruktur. Tyto požadavky vytyčují řadu otázek v oblasti výzkumu. Hlavním cílem této dizertační práce je proto návrh optimalizačního modelu a algoritmů lokalizujících vhodná místa k nasazení základnových stanic. Pro vytvoření takového optimalizačního modelu bylo nezbytné reflektovat zásadní požadavky bezdrátového pokrytí v soudobých sítích, jako jsou požadované kapacity (základnových stanic a koncových uživatelů), již existující infrastruktura, interference mezi základnovými stanicemi či dosah pokrytí. Protože algoritmus hledání řešení této úlohy má exponenciální složitost a pro velké instance není možné najít optimální řešení v dostupném čase, bylo nutné aplikovat metody umělé inteligence. Vzhledem k charakteru výpočtu byly zvoleny a implementovány meta-heuristické algoritmy, které jsou dále v práci detailněji rozebrány. Navržené optimalizační modely a algoritmy jsou následně verifikovány pomocí vhodných simulací pro městské, předměstské či venkovské oblasti. Praktické využití navrženého řešení je uvažováno jako dodatečný modul do existujících nástrojů, doporučující místa nasazení nových základnových stanic při změně charakteru sítě (např. vyšší kapacitní požadavky v určitých oblastech), sloužící jako podklad pro další praktické ověření. Hlavním přínosem práce je návrh a implementace vlastní modifikace genetického algoritmu a návrh původních matematických modelů smíšeného celočíselného programování, výrazně rozšiřujících klasickou úlohu pokrytí. Včetně jejich následného ověření na instancích se statisíci prvky a jejich publikace v impaktovaných časopisech a na mezinárodních konferencích.
Automated Closing System based on Lighting Conditions
Hajný, Stanislav ; Krajsa, Ondřej (referee) ; Hošek, Jiří (advisor)
The bachelor’s thesis deals with the design and implementation of automated doors based on lighting conditions. The ESP32 module is used as the main computing unit. The final design consists of a power supply part and a computing part. The first part describes the theory of IoT and solar systems. Next, the individual subcomponents are described. The next part deals with the design of the device and the last describes the final implementation and results.
Modeling the Basic Principles of Communication Technologies
Ruiner, Michal ; Koláčková, Aneta (referee) ; Hošek, Jiří (advisor)
This bachelor thesis deals with the design of 5 laboratory tutorials where the basic principles of communication technologies are modelled. A reader is apprised with the available software first for the simulation of network technologies. The simulators and emulators are compared. Packet Tracer, a software developed by the Cisco company, is chosen for the lab exercises and Wireshark, a network protocol analyzer, for the traffic capturing on a local PC. Then the reference model ISO/OSI is described for the basic introduction to the principle of network communication. The Chapter 3 explains the basic problematics of network paths searching, the routing table contents and division according to the type of routing and routing protocols groups. In the next chapter, particular communication protocols used in the labs are analyzed in detail. Final part briefly describes the implementation of all laboratory exercises. Laboratory tutorials are provided in the appendices.
Electroweak symmetry breaking by dynamically generated masses of quarks and leptons
Smetana, Adam ; Hošek, Jiří (advisor) ; Hořejší, Jiří (referee) ; Olejník, Štefan (referee)
Title: Electroweak symmetry breaking by dynamically generated masses of quarks and leptons Author: Adam Smetana Department: Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University Supervisor: Ing. Jiří Hošek, DrSc., Department of Theoretical Physics, Nuclear Physics Institute, Academy of Sciences of the Czech Republic Abstract: The aim of the thesis is to study models of the electroweak symmetry breaking caused by dynamically generated masses of quarks and lep- tons. (1) We perform the basic analysis whether the main underlying idea, that the masses of only known fermions can provide the elec- troweak symmetry breaking, is actually feasible. For that we elaborate a two-composite-Higgs-doublet model of the top-quark and neutrino condensation. The model suggests rather large number, O(100), of right-handed neutrinos. (2) We analyze the model of strong Yukawa dynamics where the dynamical fermion mass generation is provided by exchanges of new elementary massive complex doublet scalar fields. We focus on solving the coupled Schwinger-Dyson equations for fermion and scalar self-energies by means of approximative methods. We doc- ument that strongly hierarchical mass spectra can be reproduced. (3) We elaborate the flavor gauge model where the dynamical fermion mass...
Dynamical symmetry breaking in models with strong Yukawa interactions
Beneš, Petr ; Hošek, Jiří (advisor) ; Hořejší, Jiří (referee) ; Olejník, Štefan (referee)
Title: Dynamical symmetry breaking in models with strong Yukawa in- teractions Author: Petr Beneš Department: Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University Supervisor: Ing. Jiří Hošek, DrSc., Department of Theoretical Physics, Nu- clear Physics Institute, Academy of Sciences of the Czech Repub- lic Abstract: The primary aim of the thesis is to explore the possibility of spon- taneous symmetry breaking by strong Yukawa dynamics. Tech- nically, the symmetry is assumed to be broken by formation of symmetry-breaking parts of both the scalar and the fermion prop- agators, rather than by the scalar vacuum expectation values. The idea is first introduced on an example of a toy model with the underlying symmetry being an Abelian one and later applied to a realistic model of electroweak interaction. In addition, the thesis also deals with some more general, model-independent is- sues, applicable not only to the discussed model of strong Yukawa dynamics, but to a wider class of models with dynamical mass generation. First of these issues is the problem of fermion flavor mixing in the presence of fermion self-energies with a general mo- mentum dependence. It is in particular shown how to define the CKM matrix in such models and argued that it can come out in principle...
Regime of Thunderstorm occurence in Slovakia
Kontrošová, Jana ; Sládek, Ivan (advisor) ; Hošek, Jiří (referee)
4 Abstract The subject matter of my thesis is the regime of thunderstorm occurrence in Slovakia. In the theoretic part of my work, I deal with thunderstorm categorization, condition of its creation and development and with side-effect phenomena. I also mention continentality of climate, which is linked with disintegration and occurrence of days of thunderstorms and thunderstorms. In the practical part, I focus on statistic analysis of number of days of thunderstorms and thunderstorms at the Irish meteorological station Valentia, which represents ocean climate and at 5 Slovak meteorological stations with continental climate in the period of 1961 - 2006 or 2007. I study the trend during years, months, seasons and number of thunderstorm phenomena at the stations, while comparing principles of oceanic and continental climate in the context of thunderstorms and days of thunderstorms occurrence. The main object of my thesis it to define thunderstorm season at each station by method of cumulative series designed by I. Sládek. Conventionally specified seasons do not always match reality. By this method, it is able to determine the natural beginning, end and duration of seasons according to selected climatological parameter. The thunderstorm season at Slovak meteorological stations usually begins at 3rd of May, ends...

National Repository of Grey Literature : 183 records found   1 - 10nextend  jump to record:
See also: similar author names
24 Hosek, Jiri
4 Hošek, Jakub
96 Hošek, Jan
2 Hošek, Jaromír
1 Hošek, Josef
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