Disertacije | Repozitorij FER-a

: Long range energy efficient wireless sensor system; Dalibor Purković
Energy consumption has become one of the main parameters in evaluating sensor systems in the IoT market. The long range sensor systems which are discussed in this dissertation are not an exception. Their application in the outdoor environment makes them an ideal candidate for combining energy harvesting mechanisms with low power features. As it is discovered, using just the low power electric components is not enough to ensure energy efficiency. Techniques and mechanisms for harvesting and...

: Low-power sensor interfaces for detection of sporadic events; Marko Gazivoda
The focus of this thesis was on wake up sensor interfaces used for lowering sensor node power consumptions. The interfaces’ intended application was detection of sporadic transient events in the lower acoustic spectrum (up to 2.5 kHz), lasting up to a few seconds. The passing speedboat event was chosen as a representative event. Acoustic signal features were analyzed, and a set of criteria was developed to determine the feature’s applicability in low power interfaces for passing...

: Low-power wearable system for asthmatic wheeze detection; Dinko Oletić
Area of this research is minimization of energy consumption of electronic systems for long-term monitoring of common symptom of chronic asthma - asthmatic wheezing. The proposed electronic sensor system consists of a wearable sensor measuring the mechanical vibrations on skin surface originating from respiration, and a wireless mobile device (smartphone). The system conducts automatic recognition of respiratory sounds. The essential design requirement is energy consumption at which the...

: Machine learning and evolutionary computation in design and analysis of symmetric key cryptographic algorithms; Karlo Knežević
In the field of cryptography, Boolean functions and their generalizations, known as vectorial Boolean functions or S-boxes, play a crucial role in symmetric key cryptography. The use of carefully selected S-boxes is essential for ensuring the security of ciphers, as without them, the ciphers would be susceptible to attacks. Symmetric key cryptography can be classified into stream ciphers and block ciphers, both of which use Boolean functions (including vectorial Boolean functions) for...

: Machine learning based object classification from pulse induction metal detector data; Marko Šimić
Antipersonnel landmines still pose a significant threat to civilian safety decades after the cessation of conflicts, killing or maiming thousands of victims every year. This thesis addresses a major technological limitation of existing methods used in humanitarian demining, which rely on metallic object detection, making landmine removal a slow, expensive, and dangerous process. Specifically, the thesis aims to improve existing methods to allow the shift from the traditional concept of...

: Magnetsko polje u okolini distribucijskih transformatora; Branimir Ćućić
Napravljen je 3D proračun magnetskog polja oko distribucijskih transformatora pomoću integralnih jednadžbi. Primijenjena je metoda sekundarnih izvora. Svi dijelovi kroz koje teku struje (namoti, izvodi) su primarni izvori magnetskog polja, dok se feromagnetski materijali (jezgra, kotao) modeliraju pomoću sekundarnih izvora. Sekundarni izvori za linearni kvazistatički model feromagnetskog materijala su: - gustoća vrtložnih struja unutar volumena materijala - magnetizacijski strujni...

: Market and environment driven optimization of flexible distributed multi-generation; Tomislav Capuder
The share of renewable energy sources in electric power systems around the world is rapidly increasing and this trend is expected to continue in the future. According to "EU Energy and Climate Package" the European Union has set ground for future strategies indicating a goal of 20% share of renewable energy sources in total energy mix by the year 2020, together with 20% more efficient energy use, 20% reduced CO2 emissions and 10% more efficient transport. Several reports and documents...

: Matematički model cijevnoga hidroagregata za utvrđivanje uzroka njihanja snage; Miljenko Brezovec
Njihanje snage u hidroelektranama i općenito pojave povezane s oscilacijama i vibracijama, su česti pogonski problemi u radu pojedinih agregata. Primjeri istraživanja takvih pojava na cijevnim hidroagregatima s horizontalnim Kaplan turbinama su rijetki. Takvi agregati zbog svoje složene konstrukcije mogu imati različite probleme s oscilacijama i vibracijama, a zbog malog momenta tromosti imaju loša svojstva s aspekta stabilnosti. Pojave njihanja snage na HE Dubrava prisutne su na oba...

: Measurement of rock resistivity using inductive method in a cased well; Darko Vasić
Rock conductivity measurement is a pivotal method in the open-hole well logging for evaluation of hydrocarbon reservoirs. The conductivity measurement is also required in cased wells as an addition to the radiation methods. Only a contact conductivity tool is available for the cased well application. This thesis proposes an inductive method for simultaneous measurement of the rock conductivity and the casing properties (thickness, conductivity, and permeability) from within single...

: Measurement system for fingerprint acquisition; Ivan Plajh
In this work, fingerprint image acquisition system based on Infineon Technologies FingerTIP sensor is presented. Parts of the system that are necessary for the system functionality are explained, including the fingerprint recognition technique overview. General explanation of biometrics, needed for better understanding of the area where such systems are implemented is given. Basic comparison of the majority of the biometric technique efficiency is provided in order to determine...

: Mehanizmi kvalitete usluge i upravljanje prioritetima u sustavu UMTS i HSPA; Iva Medvid Balenović
Evolucijom 3G mobilnog širokopojasnog prometa koji nudi visoke brzine prijenosa podataka ukazala se potreba za razvojem mehanizama koji jamče učinkovito rukovanje radio resursima. Usko grlo 3G podatkovne mreže može se nalaziti u različitim dijelovima mreže, ovisno o infrastrukturi (npr. u radijskom ili jezgrenom dijelu). Operateri odlučuju na koji način se nositi s problemom zagušenja, bilo širenjem mreže, povećavajući CAPEX ili pronalaženjem i korištenjem načina za kontrolu...

: Mehanizmi kvalitete usluge za upravljanje kritičnim podacima u poslovnoj mreži; Dario Galinec
Računalna mreža u velikim tvrtkama predstavlja sustav čiji su resursi podijeljeni između više vrsta različitih aplikacija. Aplikacije poslovno-informacijskog sustava kritične su aplikacije na mreži, od velike važnosti za cjelokupno poslovanje tvrtke te kao takve zahtijevaju određene prioritete. U ovom radu opisani su mehanizmi za kvalitetu usluge, kojima se aplikacijama poslovno-informacijskog sustava, pridjeljuje prednost pred drugim aplikacijama u poslovnoj mreži, u smislu...

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