Disertacije | FER Repository

: Prostorno-vremensko proširenje sustava za upravljanje tokovima podataka; Krešimir Križanović
U današnje vrijeme prisutan je velik broj raznolikih uređaja koji su svjesni svog položaja u prostoru, kao što su pametni mobilni telefoni, tablet računala, samostalni GPS uređaji te razni senzori. Ti uređaji mogu proizvesti velike količine podataka koji imaju svoju prostornu i vremensku komponentu i koji dolaze u tokovima. Postojeći sustavi nisu u stanju efikasno upravljati takvim podacima. Postojeći sustavi za upravljanje bazama podataka podržavaju rad s prostornim podacima, ali...

: Protokol za sigurno dogovaranje kriptografski prilagodljive komunikacije neovisan o sloju; Valter Vasić
Sigurna komunikacija ključan je dio suvremenih sustava za komunikaciju i može se postići korištenjem kriptografskih algoritama i protokola. Međutim, i u takvom sustavu sigurnost komunikacije može biti ugrožena ako se koriste kriptografski algoritmi kojima su otkrivene ranjivosti. Koncept kriptografski prilagodljive komunikacije omogućuje dinamičku promjenu kriptografskih algoritama i ključeva za vrijeme rada sustava bez promjene izvedbene logike tog sustava. U doktorskoj...

: Providing absolute quality of service guarantees in passive optical networks; Tomaž Beriša
The thesis addresses issues related to absolute (parameterized) Quality of Service (QoS) guarantees for Passive Optical Networks (PON). It focuses on the problem of providing absolute bandwidth, delay and delay variation guarantees based on Service Level Agreements (SLA). Dynamic Bandwidth Allocation (DBA) algorithms are proposed to support all of the mentioned elements of QoS for PONs. Additionally, lower bounds for providing the mentioned guarantees are also formally defined and analyzed....

: Provjera kvalitete rizika kod izgradnje informacijskih sustava; Antoine Trad
Increasingly competitive business environments are the main driving forces for investment in the development of flexible and efficient information systems (IS). The success of IS development, implementation and maintenance influences the way business processes are managed and carried out, which consequently forces IS to evolve. Many factors affect the IS evolution strategy business process and IS re-engineering, based on auditing of an organisation’s information technology (IT)...

: Proširenje područja rada sinkronog generatora adaptivnim upravljanjem upotrebom neuronskih mreža; Mato Mišković
Sinkroni generator u radu na EES predstavlja izrazito nelinearni sustav. Konvencinalni linearni regulator sustava uzbude može optimalno raditi samo u okolini radne točke i pri malim poremećajima u EES-u. Optimalni pogon u širokom radnom području može se postići automatskim regulatorom koji je zasnovan na neuronskim mrežama. Primjenom postupka optimiranja u teoriji automatske regulacije poznatog kao Adaptive Critic Design (ACD), koji se zasniva na dinamičkom programiranju i...

: Proširenje područja rada sustava nadopune satelitske navigacije lokalno prilagođenim modelom ionosfere; Josip Vuković
Globalni sustavi za satelitsku navigaciju GNSS (eng. Global Navigation Satellite System) temelj su mnogih tehničkih sustava današnjice. Izvor najveće pogreške u GNSS-u je ionosfera, u kojoj zbog refrakcije dolazi do smanjenja brzine širenja elektromagnetskih valova između satelita i prijamnika. Europskim sustavom nadopune EGNOS (eng. European Geostationary Navigation Overlay Service) nadzire se cjelovitost rada globalnog sustava za pozicioniranje GPS (eng. Global Positioning System)...

: Proširenje područja stabilnog rada sinkronog generatora regulacijom uzbude; Tomislav Idžotić
Sinkroni generator se u kapacitivnom području rada približava granici stabilnosti i postaje osjetljiv na poremećaje u elektroenergetskom sustavu. Kut opterećenja pokazuje koliko je generator blizu granici stabilnosti, a povećavanjem struje uzbude generatora moguće je smanjiti kut opterećenja i povećati stabilnost generatora. U klasični algoritam regulacije uzbude generatora, u kojem je regulator napona nadređen regulatoru struje uzbude, uveden je dodatni regulator kuta...

: Quality of Experience estimation of encrypted video streaming by using machine learning methods; Irena Oršolić
With the amount of global network traffic steadily increasing, mainly due to video streaming services, network operators are faced with the challenge of efficiently managing their resources while meeting customer demands and expectations. A prerequisite for such Quality-of-Experience–driven (QoE) network traffic management is the monitoring and inference of application-level performance in terms of video Key Performance Indicators (KPIs) that directly influence end-user QoE. Given the...

: Quality of experience driven video encoding adaptation for multiparty audiovisual telemeetings on mobile devices; Dunja Vučić
Video conferencing is becoming increasingly popular in both leisure and business contexts, offering opportunities to communicate with family, friends, and colleagues, increase productivity, reduce costs, and share information in real time. High resolution displays, front and rear cameras, high speed mobile networks and modern technologies, such as WebRTC (Web Real-Time Communication), are contributing to making video conferencing free and available "anywhere at any time''. However, given the...

: Quality of experience driven video encoding adaptation strategies for cloud gaming under network constraints; Ivan Slivar
Cloud gaming has been recognized as a promising shift in the online game industry, with the aim of implementing the ``on demand`` service concept that has achieved market success in other areas of digital entertainment such as movies and TV shows. The concepts of cloud computing are leveraged to render the game scene as a video stream which is then delivered to players in real-time. The main advantage of this approach is the capability of delivering high-quality graphics games to any type of...

: Quantitative and qualitative assessment of human movement during exercising using inertial and magnetic sensors; Dominik Džaja
Wearable devices equipped with inertial and magnetic sensors are increasingly being employed for the monitoring and assessment of physical activity. The affordability, accuracy, and portability of such devices enable real-time monitoring of human movement during exercise, without requiring direct supervision by a trained professional. Furthermore, the data collected by these devices can be analyzed over time, providing valuable insights into an individual's patterns of physical activity and...

: Quantum-transport analysis of transistors based on nanoribbons of novel 2D materials; Mislav Matić
The development and optimization of future logic electron devices strongly relies on novel materials and device architectures. One of the most promising research paths is presented by 2D materials patterned into quasi-one-dimensional (1D) nanostructures known as nanoribbons. The aim of this dissertation was to develop an ab initio quantum transport method to assess the potential of quasi-1D materials for future extremely-scaled field-effect transistors (FETs). The investigated materials...

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