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1.
ARM-Based Video Intercom System with Next-Gen Human Presence Detection using Deep Learning : magistrsko delo
Mario Gavran, 2022, master's thesis

Abstract: This master's thesis presents an advanced video system with human presence detection based on deep learning and an ARM microcontroller. The objective of the thesis is to develop a system that works as a smart video intercom, which could be installed, e.g. on the entrance door, and autonomously alert the owner that a guest is in front of the door. The main goal is to use an AI algorithm, namely the neural network model on a constrained device, such as an ARM microcontroller, as their main advantage is lower power consumption and cost. The thesis also describes commonly used methods to reduce the power and memory footprint and to implement and accelerate the deep learning algorithms more effectively. Further, the most notable deep learning hardware and some general platforms are described in more detail. The thesis also presents the development of a human presence detection system based on an ARM microcontroller, VGA camera, and LCD, where Tensorflow Lite Micro, an open-source C++ framework for deploying deep learning models to embedded platforms and a pre-trained neural network model for person presence detection are used.
Keywords: TensorFlow Lite Micro, Video intercom system, ARM Cortex-M microcontroller, Human presence detection, Neural network
Published in DKUM: 08.07.2022; Views: 70; Downloads: 20
.pdf Full text (7,86 MB)

2.
Razvijanje naravoslovnih in digitalnih kompetenc v fiziki z bbc micro:bit-om : magistrsko delo
Peter Bernad, 2022, master's thesis

Abstract: Načrtovanje osnovnošolskih fizikalnih poskusov je lahko velik izziv, če nas zanima ustrezna zahtevnost ter učinkovitost izvedbe. Pri tem si lahko pomagamo z razpoložljivimi orodji in pripomočki, saj lahko denimo kompleksne fizikalne poskuse podpremo z različnimi računalniškimi animacijami, videoposnetki in simulacijami. Menimo, da je pri fizikalnih poskusih ključnega pomena tudi razvijanje naravoslovne pismenosti, naravoslovnih kompetenc in povezovanje fizikalnih pojavov z vsakdanjim življenjem. Poleg krepitve naravoslovne pismenosti ne smemo pozabiti na digitalne kompetence, ki bi jih učenci morali usvajati pri vsakem predmetu. V magistrskem delu predstavimo razvoj naravoslovnih in digitalnih kompetenc skozi fizično računalništvo z uporabo mikrokrmilnika BBC Micro:bit. Najprej predstavimo namen in primere eksperimentalnega dela pri pouku osnovnošolske fizike s poudarkom na fizikalnem računalništvu. Nato predstavimo zbirko vaj, ki smo jo najprej pilotno testirali z devetošolci in glede na rezultate izboljšali za osrednje testiranje. Na koncu podamo rezultate glede učinkovitosti zbirke vaj in razmislek o možni vključitvi v pouk fizike. Rezultati kažejo, da je zbirka vaj učinkovita, vendar bi bila potrebna še bolj poglobljena analiza glede optimalne vključitve zbirke poskusov v obvezni predmet fizika zaradi časovnih omejitev.
Keywords: BBC Micro:bit, eksperimentalno delo, fizično računalništvo, pouk fizike, naravoslovne kompetence, digitalne kompetence
Published in DKUM: 15.06.2022; Views: 147; Downloads: 12
.pdf Full text (2,94 MB)

3.
5th International Conference EnRe - Energy & Responsibility : book of extended abstracts
2022, proceedings

Abstract: The tendency to improve energy devices, the impact of environmental factors and the development of new technologies for the exploitation of sustainable resources contribute to the fact that we have witnessed intensive energy development in the last decade. The two most important Slovenian energy pools, located in Velenje and Krško, are at the turning point of renovation, and are facing major challenges in the design and planning of modern energy devices. The current generation faces a great ethical responsibility to leave their descendants a world with as little human impact on the environment as possible. Therefore, communication between experts and researchers, discussion and exchange of different views for the future is of the utmost importance, which is exactly the purpose of the EnRe Conference.
Keywords: renewable energy and energy storage systems, classic energy systems, policies and strategies for RES, alternative energy systems, energy conversions, energy transfer, electrical machine, thermal machines, mathematical methods in energy engineering, environmental protection, micro and nano energetics, hydrogen technologies, low carbon technologies and strategies, nuclear energy, smart buildings, smart cities and smart grids
Published in DKUM: 09.06.2022; Views: 231; Downloads: 46
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4.
Vizualizacija procesa preoblikovanja s krmilnikom in mikro zaslonom : diplomsko delo
Bojan Vidovič, 2018, undergraduate thesis

Abstract: Diplomsko delo opisuje avtomatizacijo in vizualizacijo elektropnevmatskega sistema z mikro krmilnikom ter mikro zaslonom na dotik. Predstavljeni so tako postopki programiranja in vizualizacije procesa kakor tudi uporabljena strojna oprema Siemens S7-200 ter Micro Panel – SIMATIC TP 177micro. Pričujoče delo opisuje tudi povezave z resničnim sistemom, različne možnosti uporabe programske opreme SIMATIC WinCC Flexible Advanced in težave, s katerimi se lahko pri uporabi srečujemo, poleg tega pa še programski paket STEP 7-Micro/WIN, uporabljen za programiranje krmilnika. Po korakih so predstavljene tudi informacije ter postopki, potrebni za konfiguracijo programov in strojne opreme ter povezavo med njimi.
Keywords: PLK, HMI, elektropnevmatski sistem, STEP 7-Micro/WIN, Siemens SIMATIC S7-200, Siemens SIMATIC WinCC flexible Advanced, Micro Panel – SIMATIC TP 177micro.
Published in DKUM: 26.09.2018; Views: 692; Downloads: 92
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5.
Micro-scale responses of granular materials under different confining pressures using the discrete element method
Mahmud Sazzad, 2016, original scientific article

Abstract: Biaxial compression tests were carried out on assemblies of ovals to study the micro-scale responses of granular materials under different confining pressures using the discrete element method (DEM). A total of 8450 ovals were generated in a rectangular frame without any overlap. Four dense samples were prepared from the initially generated sparse sample under different confining pressures. The simulated results yield a stress-straindilatancy behaviour similar to that observed in sands under different confining pressures. The evolution of the different microparameters and their inter-relationships are established. When the confining pressure is relatively high, the difference between the coordination number and the effective coordination number is very small; however, the difference is apparent for a low confining pressure. The microtopology of the granular assembly at several important states of shear is also reported. It is noted that the topological distribution of the granular materials is confining- pressure dependent. The normalized void-cell number is a minimum under the lowest confining pressure, whereas the same number is a maximum under the highest confining pressure. A linear relationship is observed between the normalized void-cell number and the effective coordination number, regardless of the confining pressures. The evolution of the deviatoric fabric for different confining pressures is measured and the macro-micro relationship is presented.
Keywords: microstructures, confining pressure, fabric, microtopology, coordination number, macro-micro relationship
Published in DKUM: 15.06.2018; Views: 852; Downloads: 65
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6.
A comparison between conventional triaxial and plane-strain compression on a particulate system using 3D DEM
Mahmud Sazzad, Kiichi Suzuki, 2012, original scientific article

Abstract: Granular materials such as sand are subjected to different stress paths depending on the in-situ conditions. For example, a granular system under the foundations experiences conventional triaxial compression (CTC), while it experiences plane-strain compression (PSC) in the case of the embankment of roads. Due to the difference in the stress paths, the behavior of granular materials also becomes different. This paper aims at comparing the behavior of granular materials under CTC and PSC conditions using the 3D discrete-element method (DEM). An isotropically compressed dense sample consisting of 8000 spheres was prepared numerically using periodic boundaries. The CTC and PSC tests were simulated using the same isotropically compressed dense sample to compare and explore the macro- and micro-mechanical responses of granular materials without any bias from the initial fabric of the numerical sample. Qualitatively, the simulated stress-strain responses are consistent with that observed in the experimental studies. The dilatancy index is found to be independent of the stress paths used in the present study. The b value (defined as b = (σ2 − σ3)/(σ1 − σ3) where σ1, σ2 and σ3 are the stresses in the x1 -, x2 - and x3 - directions, respectively) - axial strain curve has a close similarity with the stress ratio - axial strain curve for the PSC test. The evolution of the coordination number and the sliding contact fraction is independent of the stress paths. A link between the macro- and micro-quantities is observed and a unique macro-micro relationship is noticed, regardless of the stress paths applied in this study.
Keywords: conventional triaxial compression, plane-strain compression, micro response, DEM
Published in DKUM: 13.06.2018; Views: 755; Downloads: 51
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7.
An analysis of corruption in microenterprises
Mladen Tomašič, 2009, original scientific article

Abstract: The purpose of this study is to present the research work made whilst studying the presence of corruption in the operations of Slovenian micro-enterprises. Our study builds on research which we carried out in 2005 and compares the findings of both studies. We wish to present our findings to public experts for a professional assessment and provide a basis for further work. We hope that in this way we can contribute to the development of new guidelines for the preparation of further analysis, the causes and elimination or at least limitation of corruption in business operations. Notable studies, which address corporate corruption in Slovenia, are non-existent. The results have confirmed the basic research hypothesis that the presence of corruption in the micro-business environment compared to a previous study in the last five years has increased.
Keywords: micro-enterprise, micro-entrepreneur, corruption, corruptness
Published in DKUM: 28.11.2017; Views: 574; Downloads: 262
.pdf Full text (1,09 MB)
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8.
Awareness of cloud computing in Slovenian and Croatian micro-enterprises
Borut Werber, Marina Klačmer Čalopa, Igor Pihir, Anja Žnidaršič, 2015, original scientific article

Abstract: This paper presents a comparison of the two studies conducted in Slovenian and Croatian micro-enterprises (µE) about the awareness of the cloud computing (CC). We were interested in the issues relating to the characteristics of µE and the latter's use of information and communication technology (ICT) in business processes. Also, the characteristics of owners and µE were investigated. We found that the results obtained in the two countries were similar. In both cases, the most important CC characteristics were reliability, security and performance. Given that CC could represent a good business opportunity for µE, some managerial implications are proposed.
Keywords: comparison, cloud computing, cloud computing services, micro-enterprise
Published in DKUM: 03.08.2017; Views: 713; Downloads: 73
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9.
Influence of kinematic factors of friction stir welding on the characteristics of welded joints of forged plates made of EN AW 7049 A aluminium alloy
Milenko Perović, Sebastian Baloš, Dražan Kozak, Darko Bajić, Tomaž Vuherer, 2017, original scientific article

Abstract: In this paper, the influence of rotation speed and welding speed on the impact strength, microstructure and cross section micro hardness of FSW welded joints of Al-Zn-Mg-Cu high strength aluminium alloy is studied. Rotation speed was varied from 750 min−1 to 850 min−1 and welding speed from 60 mm/min to 80 mm/min. It was found that the energy of crack propagation is up to three times higher than the energy of crack initiation. This ratio was found by testing the Charpy notched specimens taken from left and right from the weld centre, 4 mm from the notch in a direction opposite to a direction of welding. Micro hardness distribution in the nugget does not show large dissipation of value regardless if the measuring point is in the upper or lower section of the nugget. Weld microstructure characteristics and zones are clearly defined at the basis of grain size and material flow.
Keywords: dynamic recrystallization, friction stir welding, impact strength, micro hardness distribution
Published in DKUM: 12.07.2017; Views: 927; Downloads: 336
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10.
Compression pre-stress of tubular torsion springs
Vinko Močilnik, Nenad Gubeljak, Jožef Predan, Jože Flašker, 2010, original scientific article

Abstract: This paper reports the results of a series of biaxial static compression and torsion experiments performed to evaluate the effects of static compression stress on the fatigue life of those smooth tubes made of high strength spring steel. The fatigue life of biaxial loaded springs depends, among others, on biaxial compression and torsion loading. A high shear loading ratio leads to low-cycle fatigue behaviour rather than high-cycle fatigue, because it was found that a crack was initiated at a local highly deformed area on surface of the specimen.The experimentally obtained results show a significant extension of fatigue strain life as a result of combining axial compression loading with torsion. Cracking behaviour was observed and it was noted that compression pre-stresses contribute to retardation of the fatigue crack initiation process and, consequently, contribute to the extension of fatigue life.
Keywords: fatigue, fatigue life, micro crack, multi axial stress state, pre-stressing, torsion, torsion bar springs, twist angle
Published in DKUM: 11.07.2017; Views: 614; Downloads: 76
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