Repository of the University of Rijeka, Faculty of Maritime Studies
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Propagation characteristics of radar electromagnetic waves
No full textOvaj rad opisuje radarski sustav, njegova temeljna svojstva te svojstva radarskih
valova i njihove refleksije. Ukratko se opisuje povijesni razvoj radarske tehnologije te
fizikalna svojstva elektromagnetskih valova. Nadalje, rad se bavi osnovnim principima
radarske tehnologije i njezine implementacije u pomorski navigacijski radar kao i njegove
osnovne funkcije. Glavni dio rada bavi se matematičkim osnovama i zakonima koji su usko
povezani uz fizikalna svojstva elektromagnetskih valova, te nadalje, fizikalnim svojstvima
radarskih elektromagnetskih valova, njihove refleksije i refrakcije te utjecaja vanjskih
elemenata i okoline na prostiranje, odbijanje i primanje radarskih signala.This paper describes the radar equipment, it's basic properties and the properties of
radar waves and their reflection. Briefly, the history of radar technology is being described,
along with physical properties of electromagnetic waves in general. Furthermore, this paper
describes the basic principles of radar technology and their implementation into the maritime
radar along with its basic functions. The main part of this paper deals with mathematical
fundamentals and laws on which the properties of electromagnetic waves are based, along
with physical properties of electromagnetic radar waves, their reflection and refraction
properties. Furthermore, the impact of external elements and the surrounding environment
on radar signals is also explained along with the resulting receiving signals
Transition of Seaports into Smart Energy Hubs Using Integrated Energy Management Systems
No full textThis paper proposes a general, comprehensive solution for port energy transformation that considers
sustainable port growth in line with green shipping requirements, on the one hand, and the smart grid
concept, on the other. In this context, it is shown that it is of great importance to design and develop
a centralized system for monitoring and managing the energy network in the port area, which can
integrate, monitor, and manage available energy sources, as well as supply demanding loads
Specific features of the safety system on passenger cruise ships
No full textTema ovog završnog rada su posebnosti sustava sigurnosti na brodovima za kružna putovanja, koje imaju ključnu uloga u aspektu osiguravanja zaštite ljudskih života putnika i posade na moru. S obzirom na razne izazove, od iznenadnih vremenskih nepogoda do tehnoloških kvarova, sustav sigurnosti na putničkim brodovima za kružna putovanja mora biti izuzetno razvijen, učinkovit i prilagođen različitim vrstama opasnosti. Posada i putnici moraju biti upoznati s pravilnim rukovanjem sredstava za spašavanje te s pravilnim načinom ponašanja u slučaju opće uzbune, dok posada mora imati i vještine u upravljanju putnicima, uključujući smirenost u kriznim situacijama, komunikaciju s putnicima, te pružanje prve pomoći.The topic of this work is the specific features of the safety system on passenger cruise ships, which play a key role in ensuring the protection of human lives, both of passengers and crew, at sea. Given the various challenges, from sudden weather changes to technological failures, the safety system on passenger cruise ships must be highly developed, efficient, and adapted to different types of hazards. The crew and passengers must be familiar with the proper handling of lifesaving equipment and the correct behavior in the event of a general alarm, while the crew must also have skills in managing passengers, including staying calm in crisis situations, communicating with passengers, and providing first aid
Information and Communication Technology, and Supply Chains as Economic Drivers in the European Union
No full textBackground: The adoption of information and communication technology (ICT) is transforming supply chains in the European Union, affecting logistical performance, economic integration and sustainability. This study examines the extent to which ICT adoption affects logistics efficiency in the 27 EU Member States. Methods: Using panel data from the World Bank and UNCTAD (2008–2018), the analysis applies the Arellano–Bond Generalized Method of Moments estimator to assess the impact of ICT indicators, broadband penetration, mobile connectivity and digital skills on logistics performance. GDP per capita and trade openness are included as control variables. Results: The results show that a 1% increase in ICT usage correlates with a 0.12-point increase in the Logistics Performance Index. Higher ICT usage leads to more efficient supply chains, lower costs and higher customer satisfaction. However, there are still differences in digitalization: the ICT usage rate of SMEs is 28% in Bulgaria and 27% in Romania, compared to the EU average of 59%. Conclusions: Bridging the digital divide requires targeted investments in ICT infrastructure, harmonized regulatory frameworks and stronger public–private cooperation to foster regional economic cohesion. This study provides policy recommendations to drive digital transformation, strengthen the resilience of logistics and improve the sustainability of supply chains in the EU
The Relationship between Ports and Regional Development - a Bibliometric and Visualization Analysis
No full textInterest in ports and their impact on regional development can be traced back to the early days of industrialization and world trade, but has become more important in recent decades due to changes in global economic patterns, technological advances and the increasing importance of sustainable development. Although the economic impact of ports has been explored in the literature, there is a lack of studies dedicated to analyzing the popularity of this topic in academic papers. This research aims to fill this gap by employing a bibliometric analysis to capture the evolution of academic work on the relationship between ports and regional development and to identify research patterns and emerging areas of interest. Bibliometric analysis and visualization tools are used for the analysis. Based on the Web of Science Core Collection database, the most important research areas, journals and author keywords are identified. The results of the analysis are visualized with the VOSviewer software. The findings show that the topic is popular and that there is a growing trend in publications on the relationship between ports and regional development. Authors from port countries dominate the field. In addition, major publishers such as Elsevier and Taylor & Francis publish the most on this topic. The results of the co-occurrence analysis show the dominance of the keywords ports, management, port performance, logistics, which indicates that these keywords are of central importance for the research area under investigation
Quantum computing
No full textKvantno računalstvo predstavlja revolucionarni iskorak u obradi informacija, temeljen na principima kvantne mehanike poput superpozicije, spregnutosti i kvantne interferencije. Za razliku od klasičnih računala koja koriste bitove, kvantna računala koriste kubite – jedinice koje mogu istodobno postojati u više stanja – omogućujući paralelnu obradu velikog broja kombinacija i značajno ubrzanje određenih izračuna. Rad pruža detaljan pregled temeljnih principa kvantnog računalstva, strukture kvantnog procesora (QPU), ključnih algoritama poput Shorova i Groverova, te aktualnog stanja u razvoju kvantnih sustava. Analiziraju se i primjene u znanosti, kriptografiji, optimizaciji i umjetnoj inteligenciji, s posebnim fokusom na mogućnosti koje kvantna tehnologija nudi za pomorsku industriju, uključujući optimizaciju ruta, prediktivno održavanje i kvantnu sigurnost. Uz prikaz vodećih tvrtki i istraživačkih centara (IBM, Google, D-Wave, Rigetti), raspravlja se o izazovima poput dekoherencije, skalabilnosti i korekcije pogrešaka. Zaključno, rad ukazuje na potencijal kvantnog računalstva da u skoroj budućnosti značajno promijeni način rješavanja najkompleksnijih problema u industriji i znanosti.Quantum computing represents a revolutionary breakthrough in information processing, based on the principles of quantum mechanics such as superposition, entanglement and quantum interference. Unlike classical computers that use bits, quantum computers use qubits – units that can exist in multiple states at the same time – enabling parallel processing of a large number of combinations and significantly accelerating certain calculations. The paper provides a detailed overview of the fundamental principles of quantum computing, the structure of a quantum processor (QPU), key algorithms such as Shorov and Groverov, and the current state of development of quantum systems. Applications in science, cryptography, optimization and artificial intelligence are also analyzed, with a special focus on the possibilities that quantum technology offers for the maritime industry, including route optimization, predictive maintenance and quantum security. In addition to a presentation of leading companies and research centers (IBM, Google, D-Wave, Rigetti), challenges such as decoherence, scalability and error correction are discussed. In conclusion, the paper indicates the potential of quantum computing to significantly change the way the most complex problems in industry and science are solved inthenear future
Air conditioning system on a cruise vessel
No full textRazvojem putničkih brodova za kružna putovanja i njihovom sve većom popularnošću, a ujedno uzimajući u obzir da su danšnji putnički brodovi za kružna putovanja ''mali gradovi'' nametnula se potreba za što efikasnijim i što ekonomičnijim sustavima klimatizacije na putničkim brodovima. Razvojem tehnologije i gradnjom sve većih brodova, sama spoznaja da su klimatizacijski sustavi drugi najveći potrošači energije (odmah iza pogona) brodarskim kompanijama postalo je od velike važnosti unaprijeđenje efikasnosti klimatizacijkih sustava u svrhu uštede energije, što izravno utijeće i na očuvanje morskog okoliša. Prihvaćanje i upotreba novih tehničkih dostignuća u klimatizaciji, značajan su faktor u smanjenju emisije ispušnih plinova i CO2 u atmosferu a poslijedično imaju pozitivan efekt na očuvanje morskog okoliša. S obzirom na današnje zahtjeve tržišta, klasifikacijske i ekološke norme koje se svakim danom postrožavaju, od izuzetne je važnosti da klimatizacijski sutav radi u što je moguće efikasnijem režimu uz što majnu potrošnju energije.With the development of passenger cruise ships and their increasing popularity, and at the same time taking into account that today's cruise ships are "small cities", the need for more efficient and economical air conditioning systems on cruise ships has been imposed. With the development of technology and with the construction of increasingly large ships, and the fact that air conditioning systems are the second largest energy consumers (right after propulsion), it has become of great importance for shipping companies to improve the efficiency of air conditioning systems in order to save energy, which directly affects the preservation of the marine environment. Acceptance and use of new technologies in air conditioning are a significant factor in reducing the emission of exhaust gases and CO2 into the atmosphere, and subsequently have a positive effect on the preservation of the marine environment. With regards to today's market requirements, classification and environmental norms that are enforced every day, it is extremely important that the air conditioning system works in the most efficient mode possible with a use of less possible energy. Keywords: passenger cruise ship, air conditioning system, efficiency, energy saving
Air masses and weather fronts in maritime navigation
No full textZračne mase i atmosferske fronte predstavljaju temeljne komponente pomorske meteorologije, s izravnim posljedicama na sigurnost plovidbe. Zračne mase na koje utječe zemljopisno područje i kakvoća podloge, razlikuju se prema temperaturi, relativnoj vlažnosti i sastavu što izravno utječe na stabilnost zraka, a time i na vremenske uvjete. Granice između zračnih masa, poznate kao atmosferske fronte, donose promjene u vremenskim uvjetima, uključujući promjenu vjetra, oborine i smanjuju vidljivost. Razumijevanje ovih pojava ključno je za navigaciju, planiranje ruta i izbjegavanje potencijalnih opasnosti. Ovaj rad analizira utjecaje zračnih masa i fronti na meteorološke uvjete te nudi smjernice za njihovo praćenje s posebnim naglaskom na primjenu u pomorskoj praksi radi povećanja sigurnosti i učinkovitosti plovidbe.Air masses and weather fronts represent basic components of marine meteorology, with direct consequences for navigation safety. Air masses influenced by geographical area and surface quality, differ in temperature, relative humidity and system, which directly affects air stability and thus weather conditions. Boundaries between air masses, known as weather fronts, bring changes in weather conditions, including change of wind, precipitation, and reduced visibility. Understanding these phenomena is essential for navigation, route planning, and avoiding potential hazards. This paper analyses impacts of air masses and fronts on meteorological conditions and offers guidelines for their monitoring and adaptation, with special emphasis on application in maritime practice to increase the safety and efficiency of navigation
Profiling Students by Perceived Immersion: Insights from VR Engine Room Simulator Trials in Maritime Higher Education
No full textResearch on students’ immersive experiences with fully immersive virtual reality (VR) technologies is extensively documented across diverse educational settings; however, in maritime higher education, it remains relatively underrepresented. Therefore, by using segmentation analysis, this study aims to profile maritime engineering students at the Faculty of Maritime Studies, University of Rijeka, by perceived immersion (PIMM) within a Head-Mounted Display (HMD) VR engine room simulator and to explore differences in their perceived learning benefits (PLBs), future behavioural intentions (FBI), and satisfaction (SAT) with the HMD-VR experience. The sample comprised 84 participants who engaged in preliminary HMD-VR engine room simulator trials. A non-hierarchical (K-mean) cluster analysis, combined with the Elbow method, identified two distinct and homogeneous groups: Immersionists and Conformists. The results of an independent sample t-test indicated that Immersionists exhibited significantly higher scores regarding perceived learning benefits, future behavioural intentions, and overall satisfaction than Conformists. The study results underscore the significance of understanding students’ subjective perception of immersion in the implementation and further development of fully immersive VR technologies within maritime education and training (MET) curricula. However, as the study is based on a specific case within a particular educational context, the result may not directly apply to the broader student population
Comparison of static, dynamic and hybrid network load balancing algorithms in a 'cloud' environment
No full textU ovom diplomskom radu obrađena je usporedba statičkih, dinamičkih i hibridnih algoritama raspodjele mrežnog opterećenja u okruženju računalstva u oblaku. Nakon teorijskog prikaza interneta i računalstva u oblaku, provedene su simulacije za svaku vrstu algoritama. Analizom rezultata potvrđena je radna hipoteza da hibridni algoritmi pružaju optimalnu ravnotežu performansi i fleksibilnosti, te se pokazuju kao najpogodniji za dinamička okruženja. Rad pridonosi boljem razumijevanju učinkovitosti algoritama u kontekstu modernih mrežnih sustava.This master thesis compares static, dynamic, and hybrid network load balancing algorithms in a cloud computing environment. Following a theoretical overview of the internet and cloud technologies, simulations were conducted for each type of algorithm. The analysis confirmed the working hypothesis that hybrid algorithms provide an optimal balance of performance and flexibility, proving to be the most suitable for dynamic environments. The thesis contributes to a better understanding of algorithm efficiency in modern network systems