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Raspberry Pi Based AIS Receiver with an RTL-SDR
No full textOvaj završni rad istražuje izradu AIS (Automatski identifikacijski sustav) prijemnika koji se temelji na kombinaciji Raspberry Pi mikroračunala i (SDR ) Software-Defined Radio tehnologije. Sustav je koncipiran kako bi omogućio prijem i analizu AIS poruka s brodova, doprinoseći sigurnosti i efikasnosti pomorskog prometa. U okviru ovog istraživanja, u radu se detaljno opisuje kako se Raspberry Pi može konfigurirati za prijem AIS podataka putem RTL-SDR uređaja, preko otvorenih izvora softvera i resurse dostupnih na mreži. Demonstrira se postupak postavljanja ovog sustava za prijem AIS poruka u stvarnom vremenu. Rad se također bavi važnošću praćenja i razmjene AIS podataka u kontekstu rastućeg pomorskog prometa i izazova sigurnosti na moru. Ističe se doprinos ovog istraživanja u smislu poboljšanja sigurnosti plovidbe i pružanja korisnih informacija pomorcima. Konačno, kroz ovo istraživanje, doneseni su zaključci o praktičnim primjenama Raspberry Pi i Software-Defined Radio tehnologija za primanje AIS poruka, te je naglašena njihova važnost za sigurnost i učinkovitost pomorskog prometa.This thesis investigates the creation of an AIS (Automatic Identification System) receiver based
on a combination of Raspberry Pi microcomputer and (SDR ) Software-Defined Radio
technology. The system was designed to enable the reception and analysis of AIS messages
from ships, contributing to the safety and efficiency of maritime traffic. As part of this research,
the paper describes in detail how the Raspberry Pi can be configured to receive AIS data via an
RTL-SDR device, through open source software and resources available online. The procedure
for setting up this system for receiving AIS messages in real time is demonstrated. The paper
also addresses the importance of tracking and sharing AIS data in the context of growing
maritime traffic and maritime security challenges. The contribution of this research in terms of
improving navigation safety and providing useful information to seafarers is highlighted.
Finally, through this research, conclusions were drawn about the practical applications of Raspberry Pi and Software-Defined Radio technologies for receiving AIS messages, and their
importance for the safety and efficiency of maritime traffic was emphasized
The database of English words in Croatian
No full textTo build a dataset to train and test the model, 60,000 words were manually labelled according to language membership by three independent evaluators. N-gram feature representation was used in combination with a linear Support Vector Machine classification algorithm (SVM) (Smola & Schölkopf, 2004) to extract English words from the ENGRI corpus (Bogunović & Kučić, 2021; Kučić, 2021). An F1 score of 0.9669 was achieved on the test set. The database contains 9,453 English words as well as their absolute and relative frequencies
European satellite navigation system " Galileo "
No full textOsnovna tema rada je europski navigacijski sustav Galileo koji je nastao prije svega kao
konkretan i jasan odgovor zemalja Europe na ostale konkurentne navigacijske sustave, pri
čemu se prvotno misli na američki navigacijski sustav poznatiji pod skraćenicom GPS.
Razvojem vlastitog pokušava se stvoriti novo neovisno tržište i olakšati sveopća i
svakodnevna uporaba navigacijskog sustava zbog sve češćih zahtjeva pozicioniranja. Sustav
određivanja lokacija i navigacije postao je prisutan u gotovo svim sferama života, a bilo koji
oblik putovanja postao je nezamisliv bez kvalitetnih satelitskih uputa koje korisnik najčešće
dobiva preko malog ekrana odnosno zaslona na svojim mobitelima ili recimo automobilima.
Međutim primjena navigacijskog sustava iznimno je opsežna i puno veća od samo ove
namijenjene građanima. Tako će se u radu dotaknuti osnova svemirske navigacije i one putem
satelita, ali će se jedno posebno poglavlje posvetiti i znanstveniku po kojemu je ovaj sustav
dobio ime, a to je Galileo Galilei. Osim toga objasnit će se način funkcioniranja Galileo
navigacijskog sustava i njegova usporedba s drugim sustavima. Na kraju će se dati smisleni
zaključak svega napisanog i potvrditi ili opovrgnuti navedene hipoteze rada.The main topic of the paper is the European navigation system Galileo, which was created
primarily as a concrete and clear response of European countries to other competitive
navigation systems, originally referring to the American navigation system better known by
the abbreviation GPS. Developing its own is trying to create a new independent market and
facilitate the universal and everyday use of the navigation system due to the increasing
positioning requirements. The system of determining locations and navigation has become
present in almost all spheres of life, and any form of travel has become unthinkable without
quality satellite directions that the user usually receives through a small screen or screen on
their mobile phones or cars. However, the application of the navigation system is extremely
extensive and much larger than only that intended for citizens. Thus, the paper will touch on
the basics of space navigation and that via satellite, but a special chapter will be dedicated to
the scientist after whom this system was named, and that is Galileo Galilei. In addition, the
operation of the Galileo navigation system and its comparison with other systems will be
explained. In the end, a meaningful conclusion of everything written will be given and the
stated hypotheses of the paper will be confirmed or refuted
Ship power plant automation
No full textU ovom radu opisuje se automatika brodske električne centrale, zahtjevi automatike koji se moraju ispuniti te je dan opis dijelova brodske električne centrale.
Objašnjen je postupak različitih načina upravljanja brodske električne centrale te je za opis načina upravljanja korišten priručnik koji opisuje upravljanje sustavom električne energije PMS 2100.This paper describes the automation of the ship's power plant, the automation requirements which must be fulfilled, and a description of the parts of the ship's electrical switchboard.
The management process of the different types of management of the ship's electrical switchboard has been explained and a manual describing the management of the PMS 2100 electricity system is used to describe the management mode
Solving the Container Relocation Problem by Using a Metaheuristic Genetic Algorithm
No full textMaritime transport is the backbone of international trade of goods. Therefore, seaports are of great importance for maritime transport. Container transport plays an important role in maritime transport and is increasing year by year. Containers transported to a container terminal are stored in container yards side by side and on top of each other, forming blocks. If a container that is not on top of the block has to be retrieved, the containers that are above the required container must be relocated before the required container is retrieved. These additional container relocations, which block the retrieval of the required container, slow down the entire retrieval process. The container relocation problem, also known as the block relocation problem, is an optimization problem that involves finding an optimal sequence of operations for retrieving blocks (containers) from a container yard in a given order, minimizing additional relocations of blocking containers. In this paper, the focus is on the two-dimensional, static, offline and the restricted container relocation problem of real-size yard container bays. A new method for resolving the container relocation problem that uses a genetic algorithm is proposed to minimize the number of relocations within the bay. The method is evaluated on well-known test instances, and the obtained results are compared with the results of various relevant models for resolving the container relocation problem. The results show that the proposed method achieves the best or the second-best result for each test instance within the test s
Compressor automatization on ships
No full textOvaj rad bazira se na osnovnoj automatici i primjeni kompresora na brodu
Ship power plant automatic control
No full textU ovom završnom radu opisan je rad sustava upravljanja električnom energijom u kontekstu broda sa sustavom dinamičkog pozicioniranja za bušenjem podmorja. U uvodnom dijelu rada opisuju se brodski elektroenergetski podsustavi, od proizvodnje do potrošnje električne energije. Opisan je zatim sustav upravljanja električnom energijom, koji objedinjuje upravljanje proizvodnjom i potrošnjom električne energije, te na kraju sustav upravljanja električnom energijom na brodu za bušenje morskog dna.This final paper describes the operation of the power management system in the context of a drilling ship with dynamic positioning. In the introductory section of this final work, the ship's power subsystems are described, from production to consumption of electrical energy. The power management system is then described, which combines the management of the production and consumption process of electrical energy, and finally the power management system on the drill ship
Division and characteristics of containers
No full textKontejneri u pomorskom prometu služe za skladištenje i prijevoz dobara/tereta od proizvođača do krajnjeg potrošača. Osim u pomorskom, koriste se u kopnenom, zračnom i željezničkom prijevozu. Njihov dizajn, različite vrste i lakoća upravljanja istima je dodatno pojednostavilo prijevoz robe diljem svijeta. Otprilike 90% dobara u svijetu se prevozi kontejnerima. Prijevoz milijuna različitih tereta kontejnerima preko mora može izgledati jednostavno, no iza vrata jednog kontejnera se krije puno više! Kontejneri su se u posljednjih 20 godina enormno razvili, a radi njih su se gradili veći brodovi pa čak mijenjale i konvencije kako bi se prijevoz istih dodatno poboljšao. Mogućnost zatvaranja i plombiranja kontejnera je dodatno osigurao prijevoz robe, a time i izgradio povjerenje korisnicima. Pomorski transport dobara te kontejnerizacija su postali vrlo važan dio za trgovinu i globalne opskrbne lance.Containers in maritime transport are used for storage and transportation of goods/cargo from the producer to the final consumer. In addition to maritime transport, they are used in land, air and rail transport. Their design, different types and ease of management further simplified the transportation of goods around the world. Approximately 90% of goods in the world are transported via containers. Transporting millions of different cargoes in containers across the sea may seem simple, but there is much more hidden behind the doors of one container! Containers have developed enormously in the last 20 years, and because of them, bigger ships were built and even conventions were changed in order to further improve their transportation. The possibility of closing and sealing the container additionally ensured the transport of goods, thereby building the trust of users. Maritime transport of goods and containerization have become a very important part of trade and global supply chains
Turbo-Brayton cycle as subcooler on LNG vessels
No full textOvaj rad opisuje „Turbo-Brayton“-ov sustav kao vrstu pothlađivanja, točnije ukapljivanja prirodnog plina, „LNG“ (eng. "Liquefied Natural Gas") tereta na istoimenim brodovima. Svrha ovog rada jest dati jasnu predodžbu o „Turbo-Brayton“ načinu pothlađivanja prirodnog plina i to kroz njegove sastavne dijelove, rukovanje istima te upravljanje sustavom i njegovim operacijama. Čitajući isti, može se zaključiti da se radi o vrlo kompleksnom, ali i zanimljivom suvremenom sustavu koji donosi mnogo prednosti i napretka u smanjivanju količine isparavanja prirodnog plina pri prijevozu na tankerima. Naime, današnji tankeri za prijevoz prirodnog ukapljenog plina predstavljaju najsuvremenija tehnološka rješenja glede propulzije, same izrade tankova i sustava za ukapljivanje. Stoga „Turbo-Brayton“ pothlađivač zasigurno ispunjava takve zahtjeve. Iz danih podataka, vidljiva je isplativost i pouzdanost sustava te jednostavnost rukovanja, a najveća prednost koja ga krasi je smanjeno održavanje. Zanimljivim konceptom, svakako izaziva zaintrigiranost mnogih kompanija te bi mogao predstavljati budućnost u smanjivanju isparavanja plina iz tankova tereta. Zaključno, vidljiv je osjetni napredak u opremanju brodova za prijevoz prirodnog ukapljenog plina te ono najvažnije; kontinuirano se povećava ekonomičnost, sigurnost, jednostavnost i smanjenje utjecaja štetnosti na okoliš.This paper is focused on describing the “Turbo-Brayton” system as a form of subcooling, more precisely reliquefaction of natural gas (“LNG”) on homonymous vessels. The purpose of this paper is to give a clear idea of the “Turbo-Brayton” system of subcooling by describing his constituent parts and how to handle/operate them, as well as management of the system and its operations. As a result, it becomes evident that it is a very complex, but also a modern system that brings numerous advantages, and leads to great progress in reducing the amount of natural gas evaporation (“boil-off gas”) during transportation on LNG vessels. Namely, today's LNG vessels represent the most modern solutions in terms of propulsion, as well as the actual production of tanks and liquefaction systems; therefore, the "Turbo-Brayton" subcooler certainly meets such requirements. From the given data, the cost-effectiveness, reliability of the system, and the ease of handling are all visible, and its biggest advantage is reduced maintenance. With an interesting concept, it certainly arouses the intrigue of many companies and could represent the future in reducing gas evaporation (“boil-off gas“) from cargo tanks on LNG vessels. In conclusion, noticeable progress is visible in equipping vessels for the transport of liquefied natural gas, and the most important thing; economy, safety, simplicity and reduction of harmful effects on the environment are continuously increasing