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Application of Microsoft Security Solutions in Digital Forensic Analysis
No full textOvaj diplomski rad prikazuje značajke digitalne forenzičke analize sustava u oblaku. Razvoj usluga u oblaku doprinio je stalnoj dostupnosti informacija, pristup s raznih uređaja i s bilo koje lokacije. Unatoč prednostima koje usluge u oblaku donose, pojavili su se i mnogobrojni sigurnosni rizici. Digitalna forenzička analiza razvijena je za specifične potrebe otkrivanja digitalnih elektroničkih dokaza i konstruiranja događaja. U kontekstu oblaka, dizajnirana je zasebna grana koja se njime bavi, a uzevši u obzir kontinuirani napredak i ekspanziju usluga u oblaku, postojeće metodologije i način pristupa provođenju forenzičke analize neprestano se usavršava. Ipak, forenzika usluga u oblaku svakodnevno se susreće s raznim izazovima. Jedan od ključnih izazova manifestira se kroz dinamičan smještaj i transfer podataka diljem različitih mreža i pravnih nadležnosti. Takva rasprostranjenost podataka značajno otežava prikupljanje digitalnih dokaza. Kako bi se otklonili spomenuti izazovi, razvijeni su moderni, unificirani programski alati koji omogućuju napredan pristup i provođenje digitalne forenzičke analize.This master's thesis shows the features of digital forensic analysis of cloud systems. The development of cloud services has contributed to the constant availability of information, and access from various devices and any location. Many security risks have been recognized despite the benefits of cloud services. Digital forensic analysis has been developed for the specific purpose of detecting digital electronic evidence and construction of events. In the context of the cloud, a separate branch of digital forensics has been designed to deal with challenges of cloud services, existing methodologies, and the approach to forensic analysis. Nevertheless, the forensics of cloud services faces various challenges every day. One of the key challenges is recognized through dynamic storage and data transfer across different networks and legal jurisdictions. Such a prevalence of data significantly makes it difficult to collect digital evidence. To overcome the challenges, modern and unified software tools have been developed that enable advanced access and conducting of digital forensic analysis
The impact of autonomous vehicles on road traffic safety
No full textAutoindustrije sve više teže prema elektrificiranim te automatiziranim prijevoznim sredstvima radi očuvanja prirode, poboljšanja klimatskih uvjeta i komfora vožnje. Uz očuvanje prirode i klimatskih uvjeta, potrebno je voditi računa i o sigurnosti cestovnog prometa kada su u pitanju autonomna vozila. Sve je više pokušaja izrade što većeg stupnja automatizacije vozila (teži se petom stupnju, tj. potpunoj autonomnosti), ali je u ovom trenutku radi postojeće cestovne infrastrukture, cijene potrebnih senzora i ostalih komponenata nužnih za funkcioniranje autonomnog vozila nije pristupačno običnom čovjeku. Veći problem će biti sa dobivanjem povjerenja u autonomna vozila iz razloga što ljudi više vjeruju vlastitim sposobnostima vožnje.The car industry is increasingly moving towards electrified and automated vehicles in order to preserve nature, improve climate conditions and driving comfort. In addition to preserving nature and climatic conditions, it is also necessary to take into account the road traffic safety when it comes to autonomous vehicles. There are more and more attempts to create the highest possible level of vehicle automation (the fifth level or full autonomy), but at the moment, due to the existing road infrastructure, the price of the necessary sensors and other components necessary for the functioning of an autonomous vehicle is not affordable for an ordinary person. A bigger problem will be gaining trust in autonomous vehicles because people have more confidence in their own driving abilities
Model construction of a fire alarm system for an aircraft piston engine compartment
No full textPutovanje avionom značajno se promijenilo kroz godine. Putovanja su brža i sigurnija, a cijene su prihvatljivije širem građanstvu. Tijekom godina sigurnost putovanja povećavala se odabirom novih materijala za izradu aviona, kako trupa, tako i interijer samih aviona. Mijenjale su se i vrste klipnih motora te materijali izrade pojedinih dijelova klipnih motora. Sigurnosti putovanja avionima dodatno je pridonijela i promjena sustava vatrodojave u prostoru avionskih motora koji je ujedno i jedan od najvažnijih aspekata sigurnosti aviona. Cilj sustava i uređaja za vatrodojavu je da budu brzi i pouzdani kako bi se mogla što prije poduzeti radnja gašenja i sprječavanja širenja požara, spašavanje ljudskih života te materijalnih dobara. Sustav vatrodojave može biti izveden na više načina. Može detektirati dim, naglu promjenu topline te plamen. U ovom radu objašnjeni su svi načini vatrodojave, a dodatno je prikazana izrada modela detektora vatrodojave koji radi na principu rada detektora dima. Detektor dima izrađen je i objašnjen u ovom radu. Detektor dima radi na principu refrakcije svjetla koja se događa unutar dima i pomoću fotootpornika javlja se svjetlosna i zvučna signalizacija kada se pojavi dim u krugu oko modela.Air travelling has changed significantly over the years. Travelling is faster and safer, and the prices are more acceptable to the general population. Over the years, travel safety has been increased by choosing new materials for the construction of aircraft, both the fuselage and the interior of the aircraft themselves. The types of piston engines and the materials used to make individual parts of piston engines have also changed. The change in the fire alarm system in the area of aircraft engine, which is also one of the most important aspects of airplane safety, has certainly contributed to the safety of air travel. The goal of fire alarm systems and devices is to be faster and more reliable so that the action of extinguishing and increasing the spread of fire can be taken as soon as possible, saving human lives and material goods. The fire alarm system can be implemented in several ways. It can detect smoke, sudden changes in heat and flames. In this paper, all methods of fire alarm are explained. In addition, the creation of a model of a fire alarm detector that works on the principle of operation of a smoke detector is presented. The smoke detector is made and explained in this paper. The smoke detector works on the principle of refraction of light that occurs inside the smoke, and with the help of a photo resistor, light and sound signaling occurs when smoke appears in the circle around the model
Multimodal Travel Choice Model Based on Discovering Travellers' Preferences
No full textPredmet znanstvenog istraživanja u okviru ovoga doktorskog rada jest definiranje metodologije otkrivanja putničkih preferencija za multimodalna putovanja na temelju zabilježenih izbora pojedinih multimodalnih putovanja putnika te razvoj modela za izbor multimodalnoga putovanja zasnovanog na putničkim preferencijama. Cilj istraživanja bio je razviti model za izbor multimodalnoga putovanja zasnovan na putničkim preferencijama otkrivenim analizom prethodnih izbora te predložiti metodologiju otkrivanja putničkih preferencija za multimodalna putovanja na temelju zabilježenih izbora pojedinih multimodalnih putovanja putnika. Na osnovi provedene analize pojedinih metoda višekriterijske optimizacije (analiza prednosti i nedostataka) te provedenog testiranja na realnim primjerima, ustanovljeno je da je najprihvatljiviji model izbora multimodalnoga putovanja zasnovan na metodi težinskog zbroja (engl. Weighted Sum Method – WSM), koji uključuje i njezinu fuzzy inačicu. Ta metoda omogućuje dobro strukturiranje problema koji se razmatra; eksplicitno opisuje alternative, kriterije i njihove relativne rezultate i težine. Posebno je važno istaknuti da nije zahtjevna za donositelja odluke (putnik) te se jednostavno implementira. Osim toga, predložena je inovativna transformacija matematičkog modela metode težinskog umnoška (engl. Weighted Product Method – WPM) u model po strukturi veoma sličan WSM-u pa se i u tom slučaju mogu primjenjivati svi postupci kao i za WSM, a prije svega predložena metoda otkrivanja putničkih preferencija. Prednost primjene transformiranog WPM-a u odnosu na WSM jest u tome što nema potreba za prethodnom normalizacijom ulaznih podataka matrice alternativa. U drugom dijelu istraživanja definirana je metodologija otkrivanja putničkih preferencija za multimodalna putovanja na temelju zabilježenih izbora pojedinih multimodalnih putovanja korisnika. Zasnovana je na dosadašnjem iskustvu iz sličnih istraživanja gdje vrijednosti kriterija odlučivanja, koje su otkrivene nakon završenih aktivnosti (putovanja), najtočnije opisuju putničke preferencije. Osim toga, utvrđeno je da je najbolje identificirati preferencije za svakog korisnika individualno, za razliku od pojedinih pristupa koji se temelje na preferencijama odgovarajuće populacije kojoj (po nekom principu) pripada korisnik. U ovom istraživanju predložen je pristup zasnovan na identifikaciji vrijednosti odgovarajućih kriterija za preferencije korištenjem postupka zasnovanog na tzv. inverznom modelu procesa odlučivanja. Matematički model inverznog procesa odlučivanja definiran je kao optimizacijska zadaća određivanja vektora težina kriterija preko minimizacije p-te norme greške aproksimacije modela procesa odlučivanja. U slučaju izbora kvadratne norme, zadaća se svodi na klasičnu metodu najmanjih kvadrata greške u matričnom obliku. Kroz provedena testiranja i validaciju utvrđeni su veoma dobri rezultati provedenog postupka otkrivanja preferencija korisnika za multimodalna putovanja.With economic globalization and continuous technological advances, human lives are changing dramatically. The lifestyle changes are particularly reflected in the population's different needs, demands, and new habits. The need for mobility is one of the requirements in this context, which poses a challenging and complex task for transport experts, urban planners, and other professionals. Sustainable mobility is one of the prerequisites for an efficient economy and society. Establishing sustainable mobility is complex because it requires rethinking at the individual level, i.e., at the level of the user - the passenger. The transition from individual transport to sustainable modes remains a complex behavioural process at the individual level and a challenge for society as a whole. Since passengers need to get from one place to another smoothly, quickly, and easily, it is necessary to provide a solution that can compete with the (still predominant) personal vehicle. One of the potential opportunities for efficient and attractive public transport hides behind the concept of multimodal travel. The idea of multimodal travel is to connect the origin and the destination in a given time frame by combining available means of transport to reduce personal vehicle use. In this sense, multimodal trip planning is becoming more important and complex with the emergence of new mobility services (e.g., Mobility-as-a-Service - MaaS) and increasingly sophisticated passenger needs. The EU transport policy highlights the concept of door-to-door multimodal transport as one of the priority measures for alleviating traffic problems. The European Commission has developed a series of legislative and policy initiatives for better, adequate infrastructure and digital solutions to promote an integrated, multimodal, and sustainable transport system. Available travel information can influence travellers' decisions to reach their destination as best as they can. Travellers need advanced information systems (tailored to them) that can provide real-time information about the combined modes before and during the trip. Ad hoc trips (single, one-time trips) are also of great interest to researchers studying traveller mobility. Ad hoc trips are specific purpose trips where the traveller does not know the trip characteristics (such as possible routes, available modes and their combination, travel time, number of transfers, and waiting time when transferring) in advance. Multimodal Journey Planners (MJPs) are a part of Intelligent Transport Systems (ITS) that provide a range of passenger transport services. The basic task of the system is to answer the user's question: "How do I get from place A to place B at a particular departure or arrival time, and under what conditions?" There are several active multimodal journey planner systems in the EU with different functionalities. Most of them include the basic functionalities (criteria for selecting a multimodal route). There is an obvious need for a user-friendly travel information platform. The modern user expects much more than just a route planning app, e.g., selecting a more environmentally friendly route, displaying the weather and road conditions during the journey, and specific personalized settings. The existing MJPs are typically based on a solution that applies the shortest route and travel time criteria. The proposed travel scenarios (using only these two criteria) have proven inadequate. In recent years, special attention has been paid to understanding passenger behaviour, i.e., individual travel patterns, perceptions, and propensities toward multimodal mobility. Traveller behaviour should be perceived as a complex behaviour that involves individuals' perceptions, attitudes, opinions, feelings, beliefs, and intentions. It can be understood as a decision-making process based on accumulated experience and behaviour patterns developed during previous travels. Traveller behaviour can be represented by a "genome model," i.e., a complete set of all biological, motivational, cognitive, and situational information that drives the individual traveller's behaviour. Variability is another feature of passenger behaviour, especially in a dynamic urban environment. The complexity of building such models that enable personalized travel decisions is due to the diversity of traveller preferences. This research aimed to develop an effective model for multimodal travel selection based on multicriteria decision methods. The analysis of the individual methods of multicriteria optimization (the analysis of advantages and disadvantages) and testing on real examples revealed that the model based on the Weighted Sum Method (WSM), including its fuzzy version, is most appropriate for multimodal travel choice. This method provides a good structuring of the observed problem by explicitly describing the alternatives, criteria, relative results, and weights. It is noteworthy that it does not impose any requirements on the decision maker (passenger) and is easy to implement. Moreover, an innovative transformation of the Weighted Product Method (WPM) mathematical model into one very similar in structure to the WSM is proposed enabling the same application of procedures and a similar identification of passenger preferences as in the WSM. The advantage of the transformed WPM over the WSM is that the input data of the alternatives matrix do not need to be pre-normalized. The second part of the research defines the methodology for identifying passengers' multimodal travel preferences based on the recorded selection of individual multimodal trips. Based on previous experience from similar research, the values of the decision criteria obtained after the completion of the activities (trips) most accurately describe travellers' preferences. In addition, it was found that it is best to identify the preferences of each user individually, as opposed to certain approaches based on the preferences of the user's population group (according to particular criteria). This study adopted an approach based on identifying the values of the criteria relating to particular preferences using a procedure based on the so-called inverse model of the decision-making process. The mathematical model of the inverse decision process is defined as the optimization task of determining the vector of criteria weights by minimizing the p-th norm of the approximation error of the decision model. When a quadratic norm is chosen, the problem reduces to the classical least squares error method in matrix form. The conducted tests and validation have returned very good results for the selected method of identifying passengers' multimodal travel preferences
Agile Methodologies Analysis for the Information Systems Development
No full textInformacijski sustavi se smatraju temeljnim alatima modernog društva pa tako i poslovanja. Razvoj informacijskih sustava je kompleksan i poprilično zahtjevan proces u kojem informacijski sustav koji se nastoji izgraditi prolazi u svojem životnom vijeku kroz određene faze koje se nazivaju životni ciklus razvoja informacijskih sustava (System Development Life Cycle – SDLC). SDLC se najčešće sastoji od šest faza, a to su planiranje i analiza, definiranje i dokumentiranje zahtjeva, dizajniranje arhitekture proizvoda, faza izrade, faza testiranja i faza implementacije. Navedeno predstavlja teorijski temelj na kojem se baziraju metodologije razvoja informacijskih sustava. Odabir ispravne metodologije je ključan aspekt prilikom izrade informacijskih sustava. Ovaj rad će prikazati osnovne karakteristike tradicionalnih i agilnih metodologija razvoja informacijskih sustava s posebnim naglaskom na Rational Unified Process – RUP. RUP je iterativna metoda razvoja informacijskih sustava koja kombinira najbolje prakse tradicionalnih i agilnih metodologija.Information systems are considered fundamental tools of modern society and thus of business society. The development of information systems is a complex and quite demanding process in which the information system that is being built goes through certain stages during its lifetime, which in technical literature has a name System Development Life Cycle - SDLC. The SDLC usually consists of six phases: planning and analysis, defining and documenting requirements, designing the product architecture, manufacturing phase, testing phase and implementation phase. SDLC represents the theoretical foundation on which the methodologies for the development of information systems are based. Choosing the right methodology is a key aspect when creating information systems. This paper will present the basic characteristics of traditional and agile methodologies for the development of information systems with a special emphasis on the Rational Unified Process - RUP. RUP is an iterative method of developing information systems that combines the best practices of traditional and agile methodologies
Application of Assistive Technologies for Improving the Quality of Life of Persons with Developmental Disabilities
No full textU diplomskom radu navedena je i opisana primjena asistivnih tehnologija u cilju poboljšanja kvalitete života osobama s poteškoćama u razvoju. U radu je prikazana i opisana arhitektura sustava koji isporučuje uslugu. Kroz rad se prikazuje kategorizacija, procjena, modeli samih sustava i potrebni korisnički zahtjevi. U radu su prikaza prijašnja aplikacijska rješenja koja odgovaraju srodnim korisničkim zahtjevima. Prikazano je predloženo aplikativno rješenje koje odgovara potrebnim zahtjevima.The application of assistive technologies in order to improve the quality of life for people with developmental disabilities is stated and described in the thesis. The paper presents and describes the architecture of the system that delivers the service. The work presents categorization, assessment, models of the systems themselves and necessary user requirements. The paper presents previous application solutions that correspond to related user requirements. A proposed application solution that meets the necessary requirements is presented
Numerical Aerodynamic Characteristics Estimation of Airfoil in Transonic and Supersonic Air Flow
No full textCilj ovog diplomskog rada je bio provesti numerički proračun aerodinamičkih karakteristika aeroprofila u krozzvučnoj i nadzvučnoj struji zraka. Proračun je napravljen pomoću računalne dinamike fluida (CFD-Computational Fluid Dynamics) unutar ANSYS Fluent Student Software-a koji koristi matematičke odnose i algoritme, dobivene rješavanjem kompletnih Navier-Stokes-ovih jednadžbi, za analizu i dobivanje rezultata, kao što su koeficijenti uzgona i otpora, te sile uzgona i otpora koje određuju mogućnosti aeroprofila. U ovom radu je provedena CFD analiza na nadzvučnom „dijamantnom“ dvostruko simetričnom klinastom aeroprofilu oko kojeg je modelirano krozzvučno i nadzvučno strujanje uz promjenu napadnog kuta. Promatrana strujanja su stlačiva i turbulentna, te se koristi DB rješavač (density-based solver), koji daje dobre rezultate za stlačiva strujanja krozzvučnih i nadzvučnih brzina. Koeficijenti uzgona i otpora za krozzvučno strujanje nisu konvergirali prema konačnoj stalnoj vrijednosti, te se pri visoko podzvučnoj (krozzvučnoj) brzini ne mogu uzeti s pouzdanošću u njihovu točnost, ali pri krozzvučnoj brzini niske nadzvučne vrijednosti, koeficijenti su, iako bez potpune konvergencije, poprimili konačnu vrijednost te se mogu uzeti s pouzdanošću u njihovu točnost. Koeficijenti uzgona i otpora za nadzvučno strujanje, dobiveni numeričkim pristupom, uspoređeni su s teorijskim rezultatima, za koje je proveden egzaktni proračun u ovom radu, te je postignuto gotovo savršeno podudaranje.Objective of this master thesis was to conduct numerical aerodynamic characteristics estimation of airfoil in transonic and supersonic air flow. Estimation was made using Computational Fluid Dynamics (CFD) within ANSYS Fluent Student Software which incorporates mathematical relations and algorithms, obtained by solving complete Navier-stokes equations, to analyze and obtain results, such as lift and drag coefficients, and lift and drag forces which determine airfoil capabilities. In this paper, CFD analysis was conducted on supersonic diamond double symmetrical wedge shaped airfoil, over which a transonic and supersonic flow was modelled, with change of angle of attack. Observed flows are compressible and turbulent and density-based solver is used, which gives good results for transonic and supersonic compressible flows. Lift and drag coefficients for transonic flow didn´t converge towards finite constant value, and at high subconic (transonic) speed they can´t be taken with confidence in their accuracy, but at transonic speed of low supersonic value, coefficients have, although without complete convergence, obtained finite value and can be taken with confidence in their accuracy. Lift and drag coefficients for supersonic flow, obtained with numerical approach, are compared with theoretical results, for which exact estimation was made, and almost perfect agreement was achieved
Assignment of Unconditional Priority to Escorted Vehicles at Intersections
No full textOvaj diplomski rad fokusiran je na razvoj inteligentnih transportnih sustava i telematičkih rješenja te je obrađena arhitektura istog. Prikazana je strategija dodjele bezuvjetnog prioriteta vozila pod pratnjom te struktura signalnih planova i algoritama na raskrižju. Radom su obrađene metodologije istraživanja kao i njezini prikupljeni podatci koji su se analizom istraživanja proveli kroz obradu rezultata, odnosno izvršena je evaluacija prikupljenih rezultata u PTV VISSIM simulacijskom softver-u.This graduate thesis focuses on the development of intelligent transport systems and telematic solutions and the architecture of it is processed. The strategy of assigning unconditional priority of escorted vehicles and the structure of signal plans and algorithms at the intersection are presented. The paper deals with the research methodologies as well as its collected data, which were carried out through the analysis of the research through the processing of the results, i.e. the evaluation of the collected results in the PTV VISSIM simulation softwer was carried out
Bicycle Traffic Planning in the City of Nova Gradiška
No full textBiciklistički promet omogućava prijevoz od izvorišta do odredišta, pridonosi poboljšanju mobilnosti građana i omogućuje prijevoz od vrata do vrata. Dobra biciklistička mreža odnosno povezanost biciklistički prometnica, zaštita biciklista od vandalizma i dodatne atraktivnosti pridonijet će privlačenju građana na korištenje biciklističkog prometa. Osim sto pridonosi zdravstvenom stanju čovjeka omogućuje uslugu od vrata do vrata izbjegavajući gužve u motornom prometu i ima ekološke koristi. Cilj rada je navesti osnovne karakteristike biciklističkog prometa i mjere za potencijalni razvoj biciklističkog prometa na području grada Nove Gradiške.Bicycle traffic enables transportation from origin to destination, contributes to improving the mobility of citizens and enables door-to-door transportation. A good bicycle network, i.e. the connection of bicycle roads, protection of cyclists from vandalism and additional attractiveness will contribute to attracting citizens to use bicycle traffic. In addition to contributing to human health, it enables door-to-door service, avoiding traffic jams and has environmental benefits. Goal of the thesis is to list the basic characteristics of bicycle traffic and measures for the potential development of bicycle traffic in the area of the city of Nova Gradiška
Coordinated Traffic Signal Control of Signalized Intersection Network Using Artificial Intelligence
No full textRazvojem industrije transporta i svakodnevnim povećanjem broja vozila javlja se sve veći problem zagušenja u gradovima. Nastala zagušenja karakterizirana su malim brzinama i velikom gustoćom prometnog toka što značajno utječe na smanjenje razine uslužnosti (engl. Level of Service - LoS). Kako bi se smanjio utjecaj zagušenja prometnog toka razvijeni su različiti sustavi upravljanja iz domene inteligentnih transportnih sustava (engl. Intelligent Transport Systems - ITS). Najčešće korišteni sustavi upravljanja raskrižjima sa semaforima u gradovima zasnivaju se na implementaciji ustaljenih (engl. Fixed-Time) ili prometno ovisnih (engl. Traffic Actuated) sustava upravljanja. Napredniji sustavi upravljanja zasnivaju se na adaptivnom upravljanju (engl. Adaptive Traffic Control Systems - ATCS). Tako današnji ATCS sustavi primjenjuju napredne tehnologije umjetne inteligencije (engl. Artificial Intelligence) za rješavanje problema zagušenja na raskrižjima sa semaforima. Unutar ovog rada uspješno je implementiran upravlja čki algoritam zasnovan na umjetnoj inteligenciji primjernom PTV Vissim simulacijskog alata i objektno orijentiranog programskog jezika C#. Implementirani algoritam upravljanja koristi genetski algoritam (engl. Genetic Algorithm) i umjetne neuronske mreže (engl. Artificial Neural Networks). Analizom dobivenih rezultata postignuto je znatno poboljšanje ukupnog vremena putovanja (engl. Total Travel Time), kašnjenja (engl. Delay) i broja stajanja (engl. Number of stops). Takoder je prikazano da se primjenom tehnologija umjetne inteligencije značajno može poboljšati upravljanje mrežom raskrižja sa semaforima.With the development of the transport industry and the daily increase in the number of vehicles, there is an increasing problem of congestion in cities. The resulting congestion is characterized by low speeds and high traffic flow density, which significantly reduces the Level of Service. To reduce the effects of traffic congestion, various traffic control systems from the domain of Intelligent Transport Systems have been developed. The most commonly used control systems for intersections with traffic lights in cities are based on the implementation of fixed-time or traffic-actuated control systems. More advanced control systems are based on Adaptive Traffic Control Systems (ATCS). Thus, today’s ATCS apply advanced technologies of Artificial Intelligence to solve the problem of congestion at intersections with traffic lights. In this thesis, a control algorithm based on Artificial Intelligence, with the use of the PTV Vissim simulation tool and objective-oriented programming language C#, was successfully implemented. The traffic control algorithm uses the Genetic Algorithm and Artificial Neural Networks to achieve traffic control. The analysis of the obtained results showed a significant reduction in Total Travel Time, delay, and the number of vehicle stops. It was also shown that the traffic control of a network of signalized intersections can be significantly improved by applying Artificial Intelligence based technology