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    3131 research outputs found

    Impact of Traffic and Technical Elements on the Maximum Road Capacity of the M 16.2 Main Road Section Gornji Vakuf Uskoplje - Rama - Prozor in Bosnia and Hercegovina

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    U radu je dat prikaz i analiza prometno-tehničkih elemenata ceste sa svrhom poboljšanja propusne moći i sigurnosti svih sudionika u cestovnom prometu. Poznavanjem propusne moći mogu se procijeniti nedostatci postojeće cestovne mreže i predložiti odgovarajuće izmjene kao što su proširenje kolnika i zavoja, rekonstrukcija zavoja, reorganizacija prometnih tokova na raskrižju, izmjene na vertikalnoj i horizontalnoj signalizaciji i sl.This thesis gives a presentation and analysis of traffic elements of a road with the aim of improving traffic flow and safety of all road users. Knowing the traffic flow, disadvantages of the existing road network can be assessed and adequate changes proposed as there are widening the roadway and the bend, reconstruction of the bend, reorganisation of traffic flow at a junction, changes in vertical and horizontal signage etc

    Data Collection with Honeypot Server for Reverse Engineering of Malware

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    Zlonamjerni program je svaki štetan kod koji ima namjeru oštetiti korisnika. Kao odgovor na sve veći broj zlonamjernih programa javlja se područje njihove analize. Implementacijom poslužitelja mamaca prikupljaju se zlonamjerni programi koji se putem obrnutog inženjeringa analiziraju. Obrnutim inženjeringom zlonamjernih programa dobiva se uvid u način na koji zlonamjerni program funkcionira, te kako zaustaviti njegovo djelovanje i daljnje širenje. Prikupljene informacije služe za unaprjeđenje i razvijanje strategija kibernetičke sigurnosti.Malware is any harmful code intended to harm the user. In response to the growing number of malicious programs, the field of malware analysis is emerging. Malware can be collected by implementing honeypot servers and analyzed using reverse engineering tools and techniques. Reverse engineering of malware provides insight into how they work and how to stop their operation and further spread. The collected information serves to stop their operation and further spread. Collected information serves to improve and develop cyber security strategies

    Cyber attacks simulation for vulnerabilities analysis of Linux kernel

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    U ovom diplomskom radu proveden je pregled i analiza ranjivosti Linux operativnog sustava. Ranjivosti jezgre Linux-a mogu omogućiti zlonamjernim korisnicima da zaobiđu sve zaštitne mehanizme jezgre i ugroze cijeli sustav. U svrhu prikaza eksploatacije ranjivosti Linux operativnog sustava, provedena je simulacija kibernetičkih napada. Temeljem rezultata provedenih simulacija predložene su smjernice poboljšanja sigurnosti sustava.In this master thesis, an overview and analysis of the Linux operating system vulnerabilities were carried out. Vulnerabilities in the Linux kernel can allow malicious users to bypass all kernel protection mechanisms and compromise the entire system. In order to demonstrate the exploitation of the vulnerabilities of the Linux operating system, a simulation of cyber attacks was carried out. Based on the results of the simulations, guidelines for improving system security were proposed

    Reinforced Learning based Variable Speed Limit Control for Traffic Flows with Connected Autonomous Vehicles

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    Današnje autoceste dizajnirane su za pružanje većeg maksimalnog prometnog kapaciteta, ali se javlja sve veći problem premalog kapaciteta istih. Međutim, gradske autoceste se najčešće ne mogu širiti, stoga je potrebno tražiti druga rješenja kako bolje iskoristiti njihov raspoloživ kapacitet. Jedan od sustava iz domene inteligentnih transportnih sustava, koji se može iskoristiti u tu svrhu, je sustav za upravljanje promjenjivim ograničenjem brzine (eng. Variable Speed Limit Control - VSLC). Autonomna vozila (eng. Autonomous vehicle - AV) i umrežena autonomna vozila (eng. Connected Autonomous Vehicles – CAV) uvelike se testiraju i brzo razvijaju u posljednjih nekoliko godina. Da bi se ispitali potencijalni učinci mješoviti tokovi prometa moraju se simulirati u različitim prometnim scenarijima. U ovom diplomskom radu napravljen je QL-DVSL (eng. Q-Learning – Dual Variable Speed Limit – QL-DVSL) sustav koji postavlja ograničenja brzine na svaku prometnu traku zasebno u simulacijskom okruženju u cestovnom mikroskopskom simulacijskom programu SUMO (eng. Simulation of Urban MObility) i programskom okruženju Python. Dobiveni rezultati dokazuju da povećanje udjela autonomnih vozila u prometnom toku djeluje pozitivno, odnosno vožnja se odvija sinkroniziranije, promet se odvija jednolikom brzinom, vrijeme putovanja se smanjuje, postignuta je veća brzina u prometnom toku i smanjena je gustoća vozila čime se smanjuju repovi čekanja.Today's motorways are designed to provide a higher maximum traffic capacity, but the problem of insufficient capacity is increasing. However, urban motorways cannot be widened most of the time, thus, it is necessary to look for other solutions to make better use of the existing capacity of urban motorways. One of the systems from the domain of intelligent transportation systems, which can be used for this, is Variable Speed Limit Control (VSLC). Autonomous vehicles (AV) and connected autonomous vehicles (CAV) have been extensively tested and developed rapidly in the last few years. To examine the characteristics of mixed traffic flows, they must be simulated in different traffic scenarios. In this thesis, a QL-DVSL (Q-Learning – Dual Variable Speed Limit) system that sets separate speed limits on each lane in a simulation environment was created in the road microscopic simulation program SUMO (Simulation of Urban MObility) and the Python programming environment. The obtained results prove that the increase in the share of AV in the traffic flow has a positive effect, i.e., driving is more synchronized, traffic proceeds at a uniform speed, driving time is reduced, and a higher speed has been achieved in the traffic flow, the density of vehicles is reduced, which reduces waiting in queues

    Analysis of autonomous vehicles simulation parameters impact on traffic flow at motorways

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    Povećanjem prometne potražnje zbog razvoja urbanih središta, smanjuje se protok te stupanj sigurnosti prometa. Time se pojavljuje potreba za uvođenjem novih tehnologija u infrastrukturnom te suprastrukturnom području. Rezultat toga su autonomna vozila s kojima je cilj postići potpunu harmonizaciju i sigurnost sudionika u prometu. Kako bi se postigao definirani cilj, prometni tok mora biti homogen. U ovom radu izrađena je simulacija u kojoj prometni tok čine autonomna vozila i konvencionalna vozila. Kako bi se kretanje autonomnih vozila prilagodilo kretanju vozila kojima upravlja čovjek, potrebno je provesti analizu kretanja autonomnih vozila mijenjajući parametre ponašanja s ciljem odabira ključnih parametara, te njihovih vrijednosti u ovisnost o prometnoj situaciji. Rezultati istraživanja pokazuju da većim udjelom autonomnih vozila te smanjenim razmakom između vozila postiže se pozitivan utjecaj na prometni tok.The consequence of increased traffic demand, due to the development of urban centres, is reduced traffic flow and level of traffic safety. This creates a need for the developing new technologies in the infrastructural and superstructural areas. The result is autonomous vehicles, intending to achieve complete harmonization of traffic flow and safety for the traffic users. To achieve the defined goal, the traffic flow must be homogeneous. The simulation created in this paper defines a traffic flow consisting of autonomous vehicles and conventional vehicles. In order to adapt the movement of autonomous vehicles to the movement of human-driven vehicles, it is necessary to analyse the movement of autonomous vehicles by changing the behaviour parameters to select key parameters and their values, depending on the traffic situation. The research results show that a higher proportion of autonomous vehicles and a reduced distance between vehicles have a positive impact on traffic flow

    Analysis of Public Roads Maintenance Activities in Karlovac County Region

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    Jedan od načina dobrog komuniciranja država međusobno ili države unutar sebe je uspostava dobre prometne mreže. Kako bi se države mogle razvijati na više razina kao što su turistički i gospodarski važno je obratiti pozornost na dobru prometnu povezanost te na dobro organiziranu radnu snagu koja će voditi brigu o ispravnosti istih. Za održavanje kvalitete cestovne infrastrukture na području Karlovačke županije nadležni su: Hrvatske autoceste d.o.o., Autocesta Rijeka-Zagreb d.d., Županijska uprava za ceste Karlovac, gradovi i općine Karlovačke Županije. Održavanje javnih cesta uređeno je Zakonom o cestama, NN 84/11, 22/13, 54/13, 148/13, 92/14, 110/19. Održavanje javnih cesta može se podijeliti u dvije skupine, a to su redovno i izvanredno održavanje. Redovno održavanje cesta provodi se u svrhu ispitivanja ispravnosti istih te provjere udovoljavanja temeljnim zahtjevima, a upravitelj ceste redovno održavanje provodi po potrebi te u vrijeme smanjenog prometa. Izvanredno održavanje spada u skupinu zahtjevnijih i opsežnijih radova, koji se izvode povremeno nakon dugoročnog planiranja ili uslijed nepredviđenog događaja. Tehnička dokumentacija izvanrednog održavanja ceste mora biti u okvirima zakonskih propisa o cestama i sigurnosti prometa na cestama.One of the ways of good communication between the states or within the states is the establishment of a good transport network. In order for countries to be able to develop on several levels, such as tourism and economy, it is important to pay attention to good transport connections and a well-organized workforce that will take care of their correctness. The following are responsible for maintaining the quality of infrastructure in the Karlovac County: Hrvatske autoceste d.o.o., Autocesta Rijeka-Zagreb d.d., Karlovac County Road Administration, cities and municipalities of Karlovac County. The maintenance of public roads is regulated by the Roads Act, OG 84/11, 22/13, 54/13, 148/13, 92/14, 110/19. Maintenance of public roads can be divided in two ways and that is routine and periodic maintenance. Routine road maintenance is performed for the purpose of examining their correctness and checking whether the basic requirements are met. The road manager conducts routine maintenance as needed and at a time of reduced traffic. Periodic maintenance belongs to the group of more demanding and extensive works, performed occasionally after long-term planning or due to an unforeseen event. Technical documentation of periodic road maintenance must be within the framework of road regulations and road safety

    Fleet Maintenance Analysis at Zagrebšped Ltd

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    Održavanje vozila, a samim time i voznog parka je zahtjevan proces koji osim samog održavanja vozila i prije održavanja, uključuje utvrđivanje same potrebe za održavanjem, način održavanja, nabavu rezervnih dijelova, skladištenje dijelova. Tvrtka Zagrebšped d.o.o. nastoji kao i svaka tvrtka koja želi biti konkurentna na tržištu, održavati svoj vozni park kako bi sva vozila bila što dostupnija u svakome trenutku, te bila što sigurnija za zaposlenike koji ih koriste. Kvalitetan i dobro organiziran proces održavanja voznog parka rezultira kratkim vremenom u zastoju odnosno u kvaru, što je i glavni cilj održavanja svakog voznog parka. Ipak i u uvjetima dobre organiziranosti dolazi do propusta i nastanka problema, što se može otkloniti ulaganjem u obrazovanje kadra.Maintenance of vehicle, and thus the vehicle fleet is a demanding process which in addition to the maintenance of the vehicle and before the maintenance, includes determining the need for maintenance, method of maintenance, procurement of spare parts, storage of parts. Zagrebšped d.o.o. strives, like any other company that wants to be competitive in the market, to maintain its fleet so that all vehicles are always accessible as possible, and as safe as possible for employees who use them. A quality and well-organized fleet maintenance process results in a short downtime, which is the main goal of each fleet maintenance. However, even in conditions of good organization, there are omissions and problems, which can be eliminated by investing in staff education

    Redesign of the International Railway Timetabling Process

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    Vozni red je skup podataka koji određuje sve planirane vožnje vlakova i željezničkih vozila na određenoj infrastrukturi tijekom vremenskog razdoblja za koji vrijedi. Voznim redom usklađuju se prijevozne potrebe podnositelja zahtjeva za dodjelu infrastrukturnog kapaciteta s raspoloživim infrastrukturnim kapacitetima upravitelja infrastrukture. Kvalitetan vozni red sastavni je dio prijevozne ponude koja uspješno odgovara na prijevoznu potražnju. Današnja izrada voznog reda ne zadovoljava potrebe korisnika te su se države članice Europske unije odlučile na promjenu postupka izrade voznog reda i planiranje kapaciteta kako bi se povećala konkurentnost željezničkog tržišta. Rok za promjenu postupka izrade voznog reda je kraj 2025. godine. Trenutno se provodi nekoliko Pilot projekta i pred zemljama Europske unije je veliki izazov kako ispuniti svoje obaveze i omogućiti uspješnu implementaciju novog postupka izrade voznog reda.A timetable is a set of data defining all planned trains and rolling stocks on a given infrastructure during the period of time for which it is valid. The need for the transport of infrastructure capacity applicants should be consistent with the available infrastructure capacity of the infrastructure manager. Quality timetables are essential components of a transportation offer that successfully responds to transportation demand. Today's capacity of the timetable does not satisfy user needs, and the Member States of the European Union decided to redesign the international railway timetabling process and to plan the capacity to increase the competitiveness of the rail market. The deadline for the redesign of the timetable is the end of 2025. Several pilot projects are currently being performed and a major challenge for the member states is to fulfil their obligations in order to enable successful implementation of the timetable redesign

    IATA One ID Concept Implementation in Passenger Air Transport

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    Ovim završnim radom opisana je procedura otpreme i prihvata putnika u zračnom prometu korištenjem programa One ID koji predlaže Međunarodno udruženje zračnih prijevoznika (engl. International Air Transport Association - IATA). IATA je razvila ideju o implementaciji biometrijske identifikacije u svrhu bržeg i jednostavnijeg odvijanja procesa prihvata i otpreme putnika u zračnom prometu koja zamjenjuje tradicionalno identificiranje putnika osobnim iskaznicama, putovnicama i vizama čekanjem u redu ispred šaltera. Implementacijom One ID programa nastoji se pojednostaviti proces otpreme i prihvata. Integriranim upravljanjem identitetom i primjenom biometrijske identifikacije putniku se pruža mogućnost da unaprijed potvrdi svoj identitet, online ili osobno, do potrebne razine u svakom koraku procesa putovanja u zračnom prometu, a pritom se zadržava privatnost osobnih podataka. Primjenom One ID programa smanjile bi se gužve na uskim grlima u procesu prihvata i otpreme putnika i prtljage, povećala bi se razina usluge te putničko zadovoljstvo putovanjem. U radu je objašnjen koncept primjene One ID programa, opisane su tehnologije biometrijske identifikacije putnika koje se odnose na skeniranje lica, dlana, otisak prsta, skeniranje šarenice, analizu DNK, identifikaciju glasa te multimodalnu biometriju dok su u posljednjem poglavlju dani primjeri koji se odnose na biometrijsku identifikaciju putnika na pojedinim zračnim lukama.This final paper describes the handling and air transport procedures using the One ID program, as proposed by the International Air Transport Association (IATA). IATA developed the idea of biometric identification in air transport in order to make the process of passenger handling procedures in air transport faster, thus replacing the traditional identification of passengers with identity cards, passports and visas by waiting in line in front of the counter. The implementation of One ID program also aims to simplify the handling and air transport procedures. Integrated identity management and the use of biometric identification provide the passenger with the opportunity to confirm their identity in advance, online or personally, to the required level at each step of the air travel process, while maintaining the privacy of personal data. Applying the One ID program in handling procedures of passengers would reduce congestion and increase the quality of service and the level of passenger satisfaction. This paper explains the concept of applying the program and describes the technology of biometric passenger identification related to the unique characteristics of the human body such as fingerprint, hand geometry, irises, face geometry, DNK analysis, voice identification and multimodal biometric. The last chapter provides specific examples related to the biometric identification of passengers at certain airports

    Interactive Web Application for Solving Vehicle Routing Problem

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    Područje inteligentnih transportnih sustava je opširno i bavi se rješavanjem velikog broja problema koji postoje danas u prometu i transportu. Jedan od tih problema je i problem usmjeravanja vozila. Rješenje samog problema je predstavljeno kao skup ruta kojima se prometni entitet kreće do početne do završne lokacije. Navedeni problem može se matematički modulirati koristeći teoriju grafova. Problem dodatno otežavaju uvjeti u realnom svijetu gdje postoje određeni vremenski prozori, različita potražnja korisnika, dostava i prikupljanje, stohastičnost prometa kao cjelina i sl. Ovaj rad prikazuje web aplikaciju koja rješava problem usmjeravanja vozila sa ograničenjem kapaciteta koristeći VNS i lokalnu pretragu izrađenu pomoću razvojnog okruženja PyCharm, programskog jezika Python i web okvira Flask. Sučelje se sastoji od interaktivne web karte te od bočne trake koja sadrži padajuću traku iz koje se odabire željeni testni problem, instrukcija za korištenje web aplikacije i gumba koji pokreće algoritam.The field of intelligent transportation systems is vast and it deals with solving a large number of problems in traffic and transportation. One of such problems is the vehicle routing problem. The solution of the problem itself is presented as a set of routes within which the traffic entity moves from origin to destination. Using the graph theory the problem can be mathematically modeled. The problem is further aggravated by real world conditions such as time windows, different user demand, pickup and delivery, stohastic nature of traffic etc. This paper shows a web application that solves capacitated vehicle routing problem using VNS and local search algorithms that is made in PyCharm development environment, Python programming language and web framework Flask. The interface consists of interactive web map and a sidebar that has a drop-down bar within which are some test problems , instructions on how to use the web application and a button that starts the algorithm are located

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