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Development of an open-source framework for automatic alignment of KORUZA free-space optical communication system : magistrsko delo
Nejc Klemenčič, 2022, master's thesis

Abstract: This thesis aims to implement an open-source framework for the automatic alignment and tracking of the KORUZA v2 Pro free-space optical solution. Free-space optical systems are explored and current optical alignment and tracking solutions are analyzed. We use Neural Network-based object detection approaches to complement the essential collection of framework functionality. We train a Neural Network to detect KORUZA v2 Pro units with data gathered from currently deployed links. The out-of-the-box solution for automatic alignment and tracking can be freely modified and extended.
Keywords: free-space optics, automatic alignment, neural networks, object detection, open-source framework
Published in DKUM: 14.03.2022; Views: 262; Downloads: 53
.pdf Full text (4,68 MB)

Revitalization and valorization of Onogošt fortress in Nikšić : master thesis
Đina Prnjat, 2021, master's thesis

Abstract: Fortress "Onogošt", known to the public simply as Bedem, is the prominent symbol of Nikšić and a valuable fragment of the cultural and historical heritage of Montenegro. In the past decade the fortress has been renovated several times, aiming to emphasize the value and importance of the old ramparts, as well as to evaluate the spectrum of possibilities of its adaptation in the context of contemporary public city space. These interventions breathed new life into the dilapidated debris, implying its transformation from a warrior fortification into a reclaimed cultural and artistic center of the city. However, this idea never fully flourished, and the current condition of the city fortress is far from imagined- neglected, crumbled and devastated. With the exception of regional music festival “Bedem fest”, a and a few minor manifestations that have only scratched the surface of its enormous potential occasionally in the past decade, there are almost no other active initiatives and this monumental space remains the silent neglected urban pocket in the heart of the city. Although still dominant and crucial in the visual perception of Nikšić, the fortress today represents essential ravaged resource of the city. The purpose of this master thesis is to restore, conserve, reconstruct and repurpose the city fortress by creating an attractive destination inside as well as the outside of the walls, which would be enjoyed by both residents and tourists. The project aims to research the potential and discover the strategy model to restore new life and impose purpose to the rapidly devastating ramparts. The renewal paradigm is researched in the course of three main segments: adaptation, revitalization and repurpose. The project aspires to preserve the existing visual identity of the city walls and raise awareness of rich cultural and historical heritage trough introducing several museums, culture facilities as well as multicultural public spaces, resulting in a prominent landmark of high visibility and the local acropolis in the revived rebranded city.
Keywords: Nikšić, fortress, reconstruction, revitalization, cultural heritage, museum, public space
Published in DKUM: 08.10.2021; Views: 381; Downloads: 63
.pdf Full text (96,88 MB)

Transport and Localization in Classical and Quantum Billiards
Črt Lozej, 2020, doctoral dissertation

Abstract: In this thesis the classical and quantum dynamics in billiard systems are considered. Extensive numerical studies of the classical transport properties in several examples of billiard families including the ergodic Bunimovich stadium and cut-circle billiards and the mixed-type Robnik and lemon billiards are performed. The analysis of the transport is based on the random model of diffusion which assumes that due the strongly chaotic dynamics the motion of the orbit on the discretized phase space is temporally uncorrelated. The cause of the deviations from the random model dynamics is traced to dynamical trapping due to stickiness. A novel approach to locally quantifying stickiness based on the statistics of the recurrence times is presented and applied to distinguish between exponential decays of recurrence times and other types of decays. This enables the identification of sticky areas in the chaotic components. Detailed maps of their structure for a wide range of parameter values, mapping the evolution of the mixed-phase spaces and revealing some particularly interesting special examples are presented. The recurrence time distributions in sticky areas are found to be well described by a mixture of exponential decays. The transport of particle ensembles in the momentum space of classical billiards is described by using an inhomogeneous diffusion model and the classical transport times are determined. The classical transport times are vital for the analysis of the localization of chaotic eigenstates in quantum billiards. The control parameter that describes the the degree of localization of the chaotic quantum eigenstates is the ratio between the Heisenberg time (Planck's constant divided by the mean level spacing) and the classical transport time. Extensive numerical calculations of the high-lying spectra and eigenstates of the stadium, Robnik and lemon quantum billiards are performed. The spectral statistics are analysed in terms of the standard methods of quantum chaos. The level repulsion exponent of localized eigenstates is found to be a rational function of the control parameter. The degree of localization is determined with respect to localization measures based on the Poincaré-Husimi representation of the eigenstates. The mean localization measure is found to be a rational function of the control parameter and linearly related to the level repulsion exponent. The distributions of the localization measures are analysed and found to be of a universal shape well described by a two parameter empirical distribution in billiards with no apparent stickiness. The nonuniversal system specific features of localization measure distributions are related to the presence of sticky areas in the phase spaces of classical billiards with specific examples shown.
Keywords: Transport, localization, chaos, quantum chaos, Hamiltonian systems, level spacing distribution, mixed phase space, billiard, quantum billiard, Husimi functions, stickiness, cantorus, chaotic eigenstates, level repulsion.
Published in DKUM: 13.01.2021; Views: 735; Downloads: 111
.pdf Full text (24,93 MB)

Prometno-tehničko projektiranje "shared space" prostora primjenom metoda konflikata : magistarski rad
Patricia Blažić, 2020, master's thesis

Abstract: Osnovni uvjet za pravilno prometno-tehničko projektiranje Shared space prostora je pravilna primjena urbanih i infrastrukturnih elemenata i zadovoljavanje parametara za tehničko projektiranje prostora kao rezultat sigurnosne analize primjenom metode konflikata. Ovim magistarskim radom obuhvatit će se sigurnosna analiza primjenom metode konflikata u svrhu pravilnog prometno – tehničkog projektiranja. Sigurnosna analiza sastojat će se od analize specifičnih konflikata korisnika Shared space-a i ozbiljnosti njihovih međusobnih sukoba. Ozbiljnost sukoba ponajviše ovisi o kretanju i ponašanju korisnika. Navedenom analizom ustvrdit će se konfliktne površine i konfliktne točke. Na temelju rezultata određuje se pravilni odabir projektno – tehničkih elemenata u svrhu smanjenja konfliktnih površina i smanjenju ozbiljnosti sukoba. Kroz praktični dio primijenit će se prometno sigurnosna analiza primjenom metode konflikata, analiza kretanja i ponašanja korisnika te analiza ozbiljnosti sukoba. Praktični primjer ovog magistarskog rada bit će rekonstrukcija Vojašniške ulice u Shared space prostor. Karakteristika Vojašniške ulice je neposredna blizina trga i ugostiteljskih sadržaja s jedne strane te šetnica s druge strane. Atraktivnost prostora privlači mnogobrojne posjetitelje različite životne dobi te njihove potrebe. Upravo ta različitost potreba dovodi do učestalih prijelaza pješaka i biciklista na nepredviđenim prijelazima. Navedeno čini predmetnu lokaciju mjestom za opravdanu primjenu Shared space prostora.
Keywords: Shared space, metoda konflikata, projektiranje, parametri, oprema
Published in DKUM: 14.07.2020; Views: 506; Downloads: 44
.pdf Full text (34,68 MB)

Nonlinear control of a one-dimensional self-balancing system with an inertia wheel
Marko Boršić, 2019, master's thesis

Abstract: The master’s thesis describes the development of a one-dimensional self-balancing system with an inertia wheel. The plan was to establish all the theoretical knowledge that was gathered throughout the process of studying at the University and to finish the practical model which has the ability to balance in one dimension. The paper contains a description of constructing the mechanical part of the pendulum, developed in SolidWorks software. It also contains the execution of the mathematical model of the inverted pendulum. The simulation was conducted in Matlab/Simulink software. Based on the results of the simulation, the design of the controller for the EC motor was made. Designed controllers and measured data required for the active balance of the system were implemented on the microcontroller STM32F4. To measure the angle and angle velocity, the gyroscope and accelerometer on the MPU6050 sensor were used. The results of the simulation and of the practical model are presented in this paper.
Keywords: modeling, inertia wheel, backstepping, state space, sliding mode
Published in DKUM: 29.03.2019; Views: 1449; Downloads: 243
.pdf Full text (3,00 MB)

Green's function for tangentialy loaded horizontaly layered half-space
Tomaž Pliberšek, Andrej Umek, 2008, original scientific article

Abstract: The topic of this paper is a novel evaluation of the integral representation of the surface Greenćs function for a layered half-space, loaded on its surface by a harmonic tangential point force. The equations of motions are reduced to wave equations by the introduction of wave potentials. The Hankel transform is applied to them and they are consecutively solved leading to the integral representation of surface displacements. They are consecutively evaluated by the proposed three step procedure. First the singularity is extracted. It is further noted that so obtained integrals, after suitably chosen branch cuts and analytic continuation of integrands are introduced, can be evaluated by contour integration for an arbitrary number of layers. They are, therefore, expressed by number of residues at the poles of integrand and the integrals along finite portions of the branch cuts. The latter ones can easily be evaluated to any desired accuracy leading to a closed form solution. Some numerical results corroborating the presented approach are given.
Keywords: elastodynamics, elastic wave propagation, Green`s function, horizontaly layered half-space, horizontal point load
Published in DKUM: 05.06.2018; Views: 757; Downloads: 68
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Shopping and business centres in Sarajevo
Rahman Nurković, 2012, original scientific article

Abstract: In the paper, influence of shopping and business centres: Mercator, Tuš, Obi Robot, Konzum and BBI on development of Sarajevo city is analysed. Results of the survey made among visitors indicate to presence of social functions (walk, leisure, recreation, fun, socialization) in five centres. The mentioned functions are more expressed in new shopping centres, while shopping is the most important motive of visits to commercial centres. Sarajevo city makes, with its surrounding, a functionally connected wholeness – city, respectively an urban region.
Keywords: shopping and business centres, central business centre, public space, social functions, Sarajevo
Published in DKUM: 10.04.2018; Views: 723; Downloads: 83
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Restraints and opportunities of the Romanian rural areas
Vasile Surd, 2010, review article

Abstract: Although Romania disposes of an extremely valuable agricultural land, it has proved to be insufficient and irrationally exploited in the last two decades, as a direct consequence of the programme for returning the agricultural areas to the former individual landowners. The lack of technological agricultural means for cultivating the land, its excessive allotment, as well as the rather inappropriate involvement of the political factor in the decision making process and the invasion of imported agricultural products have generated a continuous process of degradation of the rural life as a whole and certain repercussions on the food safety. Currently, more than 50% of the Romanian agricultural area is not being cultivated, while the state imports more than 70% of alimentary products every year.
Keywords: urban-rural space, rural state, rural policy infrastructure, agricultural land, Romania
Published in DKUM: 29.03.2018; Views: 589; Downloads: 56
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Development of rural space in post-communist southeast Europe after 1989 : a comparative analysis
Peter Jordan, 2009, review article

Abstract: This paper investigates the reasons for the current state of rural space in Southeast Europe, as well as its current structure. It is confirmed that pre-Communist structures, as well as divergent Communist systems and policies, contributed as much to current structures as have divergent post-Communist approaches and developments. Thus, we meet today very different situations in the rural space of Yugoslavian successor states on the one hand, and of other post-Communist countries of Southeast Europe with a planned economy (Romania, Bulgaria and Albania) on the other. But even the countries of former Yugoslavia show many divergences, mainly due to divergent demographic development in the wake of the Yugoslavian dissolution wars.
Keywords: structure of rural space, communist systems, transformation, agricultural policies, Southeast Europe
Published in DKUM: 19.03.2018; Views: 669; Downloads: 86
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Parameter space for a dissipative Fermi-Ulam model
Diego F. M. Oliveira, Edson D. Leonel, 2011, original scientific article

Abstract: The parameter space for a dissipative bouncing ball model under the effect of inelastic collisions is studied. The system is described using a two-dimensional nonlinear area-contracting map. The introduction of dissipation destroys the mixed structure of phase space of the non-dissipative case, leading to the existence of a chaotic attractor and attracting fixed points, which may coexist for certain ranges of control parameters. We have computed the average velocity for the parameter space and made a connection with the parameter space based on the maximum Lyapunov exponent. For both cases, we found an infinite family of self-similar structures of shrimp shape, which correspond to the periodic attractors embedded in a large region that corresponds to the chaotic motion.
Keywords: parameter space, Fermi-Ulam model, inelastic collision
Published in DKUM: 03.07.2017; Views: 1397; Downloads: 347
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