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Business optimization of comapny Jelinak d.o.o. in public international road passenger transport
No full textJavni prijevoz je prijevoz putnika u cestovnom prometu koji se obavlja u sustavu gradskog, prigradskog i međugradskog linijskog te turističkog prometa. Podsustavi javnog prijevoza putnika u cestovnom prometu su tehnički, tehnološki, organizacijski, ekonomski te pravni i ekološki. Razvitkom cestovne prometne mreže, standardizacijom kao i digitalizacijom sustava upravljanja prometom teži se optimizaciji sustava javnog linijskog prijevoza putnika. Predmet istraživanja je usmjeren na jednu javnu međugradska liniju međunarodnog karaktera. U radu se promatranjem, istraživanjem i određenim optimizacijskim rješenjima predlažu određene promjene kojima se može unaprijediti prometni proces na primjeru javne međugradske putničke linije u međunarodnom cestovnom prometnom sustavu.Public transport is the transport of passengers in road transport which is performed in the system of urban, suburban and intercity regular and tourist transport. Public road passenger transport systems are technical, technological, organizational, economic, legal and environmental. With the development of the road transport network, standardization as well as digitalization of the traffic management system, the aim is to optimize the public line passenger transport system. The subject of the research is focused on one public intercity line of international character. In the work, by observing, researching and certain optimization solutions, proposes certain changes that can improve the traffic process on the example of a public intercity passenger line in the international road transport system
Comparison of Aircraft Flight Efficiency in Simulated Vectoring and Performance-Based Navigation Conditions
No full textU ovom radu izvršena je analiza i usporedba učinkovitosti leta za dva različita načina navođenja zrakoplova, vektoriranjem i navigacijom zasnovanom na performansama zrakoplova (PBN procedurama). Podaci o učinkovitosti leta za vektoriranje unaprijed su dobiveni u projektu ATCOSIMA, te je bilo potrebno dobiti podatke o učinkovitosti prilikom korištenja PBN-a. U svrhu toga unutar zračnog prostora TMA Frankfurt, dodane su navigacijske točke koje su zajedno kreirale standardne PBN procedure za dolaske i odlaske. U radu su opisani zračni prostor i promjene koje su napravljene u njemu te priprema i provedba simulacijskih vježbi koje je odradilo petero studenata koji su sudjelovali na projektu ATCOSIMA. Podaci o duljini leta, vremenu leta, potrošnji goriva i udaljenosti u završnom prilazu prikupljeni su i opisani za sve vježbe koje su odradili studenti. Na kraju rada napravljena je usporedba dobivenih podataka i na temelju toga donesen zaključak.In this report analysis and comparison of flight efficiency indicators are done in two different ways, vectoring and performance based navigation procedures (PBN procedures). The performance data for vectoring were gathered through the project ATCOSIMA, therefore it was necessary to gain efficiency data using PBN. Navigation points were placed inside the airspace which created a standard PBN procedures for arrivals and departures. In this paper there is explanation of airspace and the changes made within it, as well as the preparation and execution of simulation exercises by five students who participated in project ATCOSIMA. Data for distance, flight time, fuel consumption and final approach distance were collected and described for all exercises done by students. At the end the conclusion of the report was made based on full comparison of gathered data
Calculation of fuel consumption for a Bell 206B helicopter according to flight speeds and different take-off masses
No full textU ovom diplomskom radu analizira se proračun potrošnje goriva za helikopter Bell 206B, s naglaskom na utjecaj brzine leta i poletne mase na potrošnju goriva. Cilj rada je pronaći optimalne brzine leta i poletne mase koje će smanjiti potrošnju goriva tijekom leta, te primijeniti dobivene rezultate u stvarnom okruženju. U radu se koriste podaci o potrošnji goriva iz priručnika za uporabu helikoptera, koji su uspoređeni s mjerenjima stvarne potrošnje goriva tijekom praktičnog leta. Konačni rezultati ovog rada mogu se primijeniti u praksi kako bi se optimizirala potrošnja goriva tijekom leta helikoptera Bell 206B, što bi rezultiralo smanjenjem troškova i povećanjem efikasnosti operacija helikoptera.In this paper, the fuel consumption calculation for the Bell 206B helicopter is analyzed, with an emphasis on the influence of flight speed and take-off weight on fuel consumption.. The goal of the work is to find optimal flight speeds and take-off masses that will reduce fuel consumption during flight, and to apply the obtained results in a real environment. The paper uses data on fuel consumption from the Helicopter Operation Manual, which were compared with measurements of actual fuel consumption during a practical flight. The final results of this work can be applied in practice in order to optimize the fuel consumption during the flight of the Bell 206B helicopter, which would result in a reduction of costs and an increase in the efficiency of helicopter operations
Preliminary Traffic Solution of the Section from Vukomerička Street to Kolodvorska Street in the City of Velika Gorica
No full textU diplomskom radu analizirana je dionica od Vukomeričke do Kolodvorske ulice u gradu Velika Gorica. Na predmetnoj dionici uočena su prometna zagušenja te povećani broj prometnih nesreća. Definirana je zona obuhvata predmetnog područja proučavanja te je napravljena detaljna analiza postojećeg stanja. Analizira se postojeća prometna infrastruktura, regulacija i organizacija prometnih tokova te sigurnost cestovnog prometa na dionici. Izlaskom na teren dobiven je jasniji uvid o postojećem stanju dionice, izvršeno je brojanje prometa te se dobila slika o prometnom opterećenju tri predmetna raskrižja. Kako bi došli do idejnog prometnog rješenja te rekonstrukcije prometne mreže, potrebno je prikupiti sve potrebne podatke. Shodno dobivenim podatcima predložena su nova prometna rješenja raskrižja, a sve u svrhu povećanja razine usluge, propusne moći te sigurnosti u prometu. Cilj diplomskog rada je predložiti optimalno idejno prometno rješenje temeljeno na analizi postojećeg stanja.The thesis analyzed the section from Vukomerička to Kolodvorska Street in the city of Velika Gorica. Traffic congestion and an increased number of traffic accidents were observed on the section in question. The zone covering the subject area of study was defined and a detailed analysis of the current situation was made. The existing transport infrastructure, regulation and organization of traffic flows and the safety of road traffic on the section are analysed. By going out into the field, a clearer insight into the current state of the section was obtained, traffic was counted and a picture of the traffic load of the three intersections in question was obtained. In order to arrive at a conceptual traffic solution and reconstruction of the traffic network, it is necessary to collect all the necessary data. Based on the obtained data, new traffic solutions for the intersection were proposed, all for the purpose of increasing the level of service, bandwidth and traffic safety for all participants. The aim of the thesis is to propose an optimal conceptual traffic solution based on the analysis of the existing situation
Impact of Alcohol on Driver's Visual Perception
No full textVizualna percepcija predstavlja najvažniji proces u prikupljanju informacija iz okoline prilikom vožnje. Rezultat je složenih procesa prikupljanja informacija iz spektra vidljivosti te njihove interpretacije. Postoji puno različitih čimbenika koji mogu utjecati na krajnji ishod vizualne percepcije odnosno na njeno povećanje ili smanjenje. Jedan od takvih čimbenika koji će se obrađivati u daljnjem dijelu ovog rada je alkohol. Konzumacijom alkohola se smanjuje vidno polje te također dolazi do smanjenja kognitivnih sposobnosti vozača. Ovisno o količini konzumiranog alkohola različito se manifestira u pogledu djelovanja na čovjeka. U radu će se provesti istraživanje na simulatoru uz „pijane naočale“ kako bi se ustvrdilo kako određena količina alkohola djeluje na vozača u smislu vizualne percepcije. Istraživanje se provodi nad mladim vozačima do 30 godina starosti jer su upravo oni najveći konzumenti alkohola koji upravljaju automobilima. Cilj ovakve vrste istraživanja je predočiti kako manje količine alkohola (0,4 do 0,8) djeluju na čovjeka te koliku opasnost pružaju prilikom vožnje. Istraživanje se provodi za brzinu i lateralni položaj. Nakon provedenog istraživanja rezultati pokazuju kako ispitanici u prosjeku voze ispod ograničenja propisane brzine, ali se vidi razlika između rezultata po skupinama. Kod lateralnog položaja nisu primijećena veća odstupanja od prosjeka.Visual perception represents the most important process of gathering information from the environment while driving. It is the result of complex processes of collecting information from the visibility spectrum and interpreting it. There are numerous factors that can influence the ultimate outcome of visual perception, either enhancing or reducing it. One such factor that will be discussed further in this study is alcohol. Alcohol consumption reduces the field of vision and also impairs the driver`s cognitive abilities. Depending on the amount of alcohol consumed, its effects on an individual can vary. The study will be conducted using a simulator with „drunk glasses“ to determine how a ceratin amount of alcohol affects a driver in terms of visual perception. The research focuses on young drivers up to the age of 30, as they are the most significant consumers of alcohol who operate vehicles. The goal of this type of research is to demonstrate how smaller amounts of alcohol (0,4 do 0,8) affect an individual and the level of danger they pose while driving. The research is being conducted on speed and lateral position. After conducting the research, the results show that, on average, the participants drive below the prescribed speed limit, but there are differences observed between the results among the groups. Regarding the lateral position, no significant deviations from the average have been noticed
Implementation of Self-Service and Contactless Technology on the Passenger Terminal Sub-Systems
No full textKako bi zračna luka osigurala učinkovite procese prihvata i otpreme putnika u putničkom terminalu, pažnju je potrebno usredotočiti na razvoj samouslužne i beskontaktne tehnologije. Ovaj rad se fokusira na procese prihvata i otpreme putnika te analizu kako implementacija samouslužne i beskontaktne tehnologije utječe na te procese. Proces prihvata i otpreme obuhvaća skup aktivnosti koje se obavljaju u putničkom terminalu kako bi se osigurao brži protok putnika i prtljage i optimizirali resursi zračne luke. Taj proces potrebno je kontinuirano prilagođavati i unaprjeđivati primjenom različitih tehnoloških inovacija, a od kojih se može izdvojiti samouslužna i beskontaktna tehnologija, koja pridonosi održivom razvoju zračne luke, a glavni cilj unapređivanja procesa je pružanje kvalitetnije usluge putnicima.In order for the airport to ensure efficient passenger handling process in the passenger terminal, attention should be focused on the development of self-service and contactless technology. This paper focuses on the process of passenger handling and the analysis of how the implementation of self-service and contactless technology affects this process. The acceptance and dispatch process encompasses a set of activities performed in the passenger terminal to ensure a faster flow of passengers and baggage and optimize airport resources. This process needs to be continuously adjusted and improved by applying various technological innovations, among which self-service and contactless technology can be singled out, which contributes to the sustainable development of the airport, and the main goal of improving the process is to provide better service to passengers
Application of Cryptography in Intelligent Transport Systems
No full textOvaj rad bavi se problematikom primjene kriptografskih sustava u inteligentnim transportnim sustavima s ciljem efikasnije i bolje zaštite podataka ili informacija. Korištenjem kriptografskih tehnika poput digitalnih potpisa, simetričnog i asimetričnog šifriranja te hash funkcija postiže se sigurnost i pouzdanost sustava. Primjena kriptografije u inteligentnim transportnim sustavima omogućava povjerljivost, autentičnost te integritet podataka koristeći se standardiziranim i sigurnim algoritmima za šifriranje i dešifriranje.This paper deals with the issue of the application of cryptographic systems in intelligent transport systems with the aim of more efficient and better protection of data or information during communication. By using cryptographic techniques such as digital signatures, symmetric and asymmetric encryption and the hash functions, it achieves the security and reliability of the system. The application of cryptography in intelligent transport systems enables the confidentiality, authenticity and integrity of data by using standardized and secure encryption and decryption algorithms
Road Vehicle Steering System Analysis
No full textUpravljački sustav vozila aktivni je element sigurnosti i odgovoran je za kontroliranje smjera kretanja vozila. Aktivni i pasivni elementi sigurnosti te adaptivni sustavi doprinose sigurnosti i udobnosti vožnje. Upravljački sustav sastoji se od tri ključne komponente, a to su kolo upravljača, upravljački stup i upravljačka letva koji zajedno uz pomoć servo sustava prenose okretni moment na kotače. Servo sustav može se nalaziti na stupu upravljača ili upravljačkoj letvi te olakšava vozaču zakretanje kola upravljača pojačavajuću ulaznu silu zakretanja na kotače. Adaptivni sustavi poput adaptivnog tempomata, sustava automatskog parkiranja, sustava za izbjegavanje sudara i sustava za održavanje vozila unutar trake nadograđuju funkcionalnost upravljačkog sustava. Različite vrste ovjesa, poput MacPherson ovjesa, multilink ovjesa i ovjesa s dvostrukim vilicama doprinose stabilnosti, udobnosti i performansama vozila. Usklađen i ispravan rad svih elemenata omogućuje sigurniju, udobniju i napredniju vožnju.The vehicle's steering system is an active safety element responsible for controlling the direction of vehicle movement. Active and passive safety elements, along with adaptive systems, contribute to driving safety and comfort. The steering system consists of three key components: the steering wheel, steering column, and steering rack, which, together with the help of the servo system, transmit the rotational force to the wheels. The servo system can be located on the steering column or steering rack and facilitates the driver's wheel turning by amplifying the input force applied to the wheels. Adaptive systems like adaptive cruise control, automatic parking, collision avoidance, and lane keeping systems enhance the functionality of the steering system. Different types of suspensions, like as MacPherson suspension, multilink suspension, and double-wishbone suspension, contribute to stability, comfort, and vehicle performance. The harmonized and proper functioning of all components enables a safer, more comfortable, and advanced driving experience
Aviation Battery Internal Resistance Test
No full textU ovom radu analiziran je princip rada akumulatora. Detaljno su razrađene najčešće izvedbe akumulatora u zrakoplovu te su objašnjena konstrukcijska rješenja. Mjerenja unutarnjeg otpora su prikazana na primjeru olovnih akumulatora koji se koriste u zrakoplovu Cessna 172 i Diamond DV20. Rezultati su pokazali da Cessnin akumulator ima manji unutarnji otpor, točnije 0,015 Ω, a Diamondov 0,051 Ω. Analizom je utvrđeno da akumulator zrakoplova Diamond DV20 ima veću sklonost samopražnjenju.This paper examines the operating principle of batteries. The most common aircraft battery designs are thoroughly discussed, and their structural solutions are explained. Measurements of internal resistance are demonstrated using the example of lead-acid batteries used in the Cessna 172 and Diamond DV20 aircraft. The results indicate that the Cessna battery has significantly lower internal resistance. It has a resistance of 0,015 Ω and the Diamond battery has 0,051 Ω. The analysis revealed that the battery from the Diamond DV20 aircraft exhibits higher self-discharge tendency
Determining the Role of Electronic Communication Network in Critical Communication Infrastructure
No full textKritična infrastruktura predstavlja svu fizičku imovinu, sustave ili dijelove sustava čiji bi prestanak rada ili uništenje imalo veliki utjecaj na stabilnost i integritet države. S obzirom na razvoj tehnologije i ovisnost rastućeg broja sektora o elektroničkoj komunikacijskoj infrastrukturi, u pitanje se dovodi njena sigurnost. Ključna uloga u zaštiti kritične infrastrukture pridodaje se pravovremenom i ispravnom utvrđivanju elemenata kritične infrastrukture, te prilagodba procesa održavanja kako se rad kritične infrastrukture ne bi doveo u stanje kvara.Critical infrastructure represents all physical assets, systems or parts of systems whose cessation of operation or destruction would have a major impact on the stability and integrity of the state. Given the development of technology and the dependence of a growing number of sectors on the electronic communication infrastructure, its security is being questioned. A key role in the protection of critical infrastructure is added to correct determination of elements of critical infrastructure, and the adjustment of the maintenance process as the operation of critical infrastructure to prevent critical infrastructure from reaching a state of failure