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Sustainable operations of last mile logistics based on machine learning processes
Jerko Oršič, Borut Jereb, Matevž Obrecht, 2022, izvirni znanstveni članek

Opis: The last-mile logistics is regarded as one of the least efficient, most expensive, and polluting part of the entire supply chain and has a significant impact and consequences on sustainable delivery operations. The leading business model in e-commerce called Attended Home Delivery is the most expensive and demanding when a short delivery window is mutually agreed upon with the customer, decreasing possible optimizing flexibility. On the other hand, last-mile logistics is changing as decisions should be made in real time. This paper is focused on the proposed solution of sustainability opportunities in Attended Home Delivery, where we use a new approach to achieve more sustainable deliveries with machine learning forecasts based on real-time data, different dynamic route planning algorithms, tracking logistics events, fleet capacities and other relevant data. The developed model proposes to influence customers to choose a more sustainable delivery time window with important sustainability benefits based on machine learning to predict accurate time windows with real-time data influence. At the same time, better utilization of vehicles, less congestion, and fewer failures at home delivery are achieved. More sustainable routes are selected in the preplanning process due to predicted traffic or other circumstances. Increasing time slots from 2 to 4 h makes it possible to improve travel distance by about 5.5% and decrease cost by 11% if we assume that only 20% of customers agree to larger time slots.
Ključne besede: supply chain management, real-time, home delivery, business modeling, e-commerce, time window
Objavljeno v DKUM: 19.02.2024; Ogledov: 29; Prenosov: 4
.pdf Celotno besedilo (1,54 MB)
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Analysis of higher-order bézier curves for approximation of the static magnetic properties of NO electrical steels
Ermin Rahmanović, Martin Petrun, 2024, izvirni znanstveni članek

Opis: Adequate mathematical description of magnetization curves is indispensable in engineering. The accuracy of the description has a significant impact on the design of electric machines and devices. The aim of this paper was to analyze the capability of Bézier curves systematically, to describe the nonlinear static magnetic properties of non-oriented electrical steels, and to compare this approach versus the established mathematical descriptions. First, analytic functions versus measurements were analyzed. The Bézier curves were then compared systematically with the most adequate analytic functions. Next, the most suitable orders of Bézier curves were determined for the approximation of nonlinear magnetic properties, where the influence of the range of the input measurement dataset on the approximation process was analyzed. Last, the extrapolation capabilities of the Bézier curves and analytic functions were evaluated. The general conclusion is that Bézier curves have adequate flexibility and significant potential for the approximation and extrapolation of nonlinear properties of non-oriented electrical steels.
Ključne besede: analytical modeling, anhysteretic curve, applied mathematics, Bézier curve, curve fitting, first magnetization curve, major loop, mathematical modeling, non-oriented electrical steel
Objavljeno v DKUM: 01.02.2024; Ogledov: 70; Prenosov: 4
.pdf Celotno besedilo (4,90 MB)

Text mining tourism literature
Ajda Pretnar Žagar, Tomaž Curk, 2021, objavljeni znanstveni prispevek na konferenci

Opis: Literature reviews are essential for understanding a specific domain as they map the main topics of current re-search. Our aim was to provide a framework for retrieving articles from online databases and analyzing them in a single script. We provide the analytical pipeline as open-source (https://github.com/tourism4-0/BibMine). The main research focus was on analyzing 318 abstracts from scientific papers on tourism and innovation, which we report in Zach et al. (2019). We used LDA topic modeling to uncover ten main topics, which we analyzed using pyLDAvis visualization. We used saliency and relevance scores to determine the main words that de-scribe a topic. The uncovered topics range from climate change and land use to smart destinations, travel expe-riences, and ICT. We performed similar analyses for the term "stakeholders," where we also observed the main verbs related to the query. Since verbs best define an activity, we used them to determine how stakeholders are involved in tourism development. Finally, we analyzed papers with the keyword "technology," where energy efficiency, VR, web technology, and augmented tourist experiences were the main topics.
Ključne besede: text mining, literature review, meta-analysis, topic modeling, tourism
Objavljeno v DKUM: 24.01.2024; Ogledov: 50; Prenosov: 2
.pdf Celotno besedilo (24,52 MB)
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Experimental validation of a dynamic photovoltaic/thermal collector model in combination with a thermal energy storage tank
Klemen Sredenšek, Sebastijan Seme, Bojan Štumberger, Miralem Hadžiselimović, Amor Chowdhury, Zdravko Praunseis, 2021, izvirni znanstveni članek

Opis: The primary objective of this paper is to present a dynamic photovoltaic/thermal collector model in combination with a thermal energy storage tank. The added value of the proposed model is the use and integration of existing dynamic models for describing the entire photovoltaic/thermal system. The presented model was validated using measurements on the experimental system located at the Institute of Energy Technology, Faculty of Energy Technology, University of Maribor. The validation was carried out based on three different weather conditions—sunny, cloudy, and overcast. The validation results were evaluated using the normalized root mean square error and mean absolute percentage error for the temperature and output power of the photovoltaic/thermal collector and the temperature of the thermal energy storage tank. The model results concurred with the measurements, as the average mean absolute percentage error values for the temperature and output power of the photovoltaic/thermal collector and thermal energy storage tank temperature were 5.82%, 1.51%, and 7.58% respectively.
Ključne besede: photovoltaic/thermal collector, thermal energy storage tank, dynamic modeling, temperature distribution, output power
Objavljeno v DKUM: 13.11.2023; Ogledov: 122; Prenosov: 9
.pdf Celotno besedilo (8,22 MB)
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Experimental validation of a thermo-electric model of the photovoltaic module under outdoor conditions
Klemen Sredenšek, Bojan Štumberger, Miralem Hadžiselimović, Sebastijan Seme, Klemen Deželak, 2021, izvirni znanstveni članek

Opis: An operating temperature of the photovoltaic (PV) module greatly affects performance and its lifetime. Therefore, it is essential to evaluate operating temperature of the photovoltaic module in different weather conditions and how it affects its performance. The primary objective of this paper is to present a dynamic thermo-electric model for determining the temperature and output power of the photovoltaic module. The presented model is validated with field measurement at the Institute of Energy Technology, Faculty of Energy Technology, University of Maribor, Slovenia. The presented model was compared with other models in different weather conditions, such as clear, cloudy and overcast. The evaluation was performed for the operating temperature and output power of the photovoltaic module using Root-Mean-Square-Error (RMSE) and Mean-Absolute-Error (MAE). The average RMSE and MAE values are 1.75C and 1.14C for the thermal part and 20.34 W and 10.97 W for the electrical part.
Ključne besede: dynamic modeling, thermo-electric model, accuracy, measuring device, temperature, output power, PV module
Objavljeno v DKUM: 13.11.2023; Ogledov: 200; Prenosov: 11
.pdf Celotno besedilo (9,51 MB)
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Design of thermal power plant modernization and rehabilitation model for the new market demands and challenges
Martin Bricl, Jurij Avsec, 2021, izvirni znanstveni članek

Opis: The article presents the model for the rehabilitation of existing conventional thermal power plants in order to lower the consumption of fossil fuels. Instead of them, the model uses an alternative energy source - sun irradiation. The proposed rehabilitation model is theoretically calculated and designed. The model in the software environment Matlab Simulink was developed, based on previous calculations and determined parameters. In this article, it is presented the combination of Clausius - Rankine process and solar central receiver system. The model enables simultaneous calculations of exit model parameters for the complete model, based on predetermined entering parameters of the model.
Ključne besede: Clausius Rankine process, solar central receiver system, modeling, analysis, Matlab Simulink software environment
Objavljeno v DKUM: 10.11.2023; Ogledov: 123; Prenosov: 9
.pdf Celotno besedilo (1001,15 KB)
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Designing and sculpting a fantasy character in the software Blender : diplomsko delo
Ognen Cvetanoski, 2023, diplomsko delo

Opis: This thesis delves into the visual communications and techniques of 3D character sculpting within the Blender software. The objective of this study is to understand how each element from visual communications and graphic design theory is crucial for the creation of a coherent, intriguing and engaging character. Through an extensive look at the three sculptural tenets, the research presents an overview of the necessary guidelines to be considered for any sculpting process. Furthermore, we sketch the first iteration of our character upon analyzing already existing fantastical characters. In this study we delve into the basics of the Blender software and its sculpting capabilities along with its various tools and brushes. Additionally, we focus on the creation of realistic materials which are going to be rendered in the software's own Cycles render engine. Lastly, in the postprocessing stage we will elevate the final product to appear more striking and appealing for the audience.
Ključne besede: Blender, Digital sculpting, Modeling, Design.
Objavljeno v DKUM: 13.10.2023; Ogledov: 220; Prenosov: 20
.pdf Celotno besedilo (6,57 MB)

Development and optimisation of a business intelligence system : master's thesis
Mark Žohar, 2023, magistrsko delo

Opis: In the fast-paced business landscape, unexpected events can pose significant challenges for companies. A lot of times, business intelligence presents a solution for companies in dealing with changes and improving organizational efficiency. As part of this master’s thesis, we have developed a business intelligence system that assists in the planning of new releases of smartphone components. We have simulated data and created reports, which can help the stakeholders to plan and analyze important milestones easily. We have tested two different data structures and showed how star schema is the most beneficial data structure for our BI system. We achieved this by restructuring data into a star schema model at different stages of migration and then compared the size of data and responsiveness of operations.
Ključne besede: business intelligence, star schema, data modeling
Objavljeno v DKUM: 27.06.2023; Ogledov: 262; Prenosov: 40
.pdf Celotno besedilo (1,69 MB)

European first-year university students accept evolution but lack substantial knowledge about it: a standardized European cross-country assessment
Paul Kuschmierz, Anna Beniermann, Alexander Bergmann, Rianne Pinxten, Tuomas Aivelo, Justyna Berniak-Woźny, Gustav Bohlin, Anxela Bugallo-Rodriguez, Pedro Cardia, Bento Filipe Barreiras Pinto Cavadas, Andrej Šorgo, Gregor Torkar, 2021, izvirni znanstveni članek

Opis: Investigations of evolution knowledge and acceptance and their relation are central to evolution edu‑ cation research. Ambiguous results in this feld of study demonstrate a variety of measuring issues, for instance difer‑ ently theorized constructs, or a lack of standardized methods, especially for cross-country comparisons. In particular, meaningful comparisons across European countries, with their varying cultural backgrounds and education systems, are rare, often include only few countries, and lack standardization. To address these defcits, we conducted a stand‑ ardized European survey, on 9200 frst-year university students in 26 European countries utilizing a validated, com‑ prehensive questionnaire, the “Evolution Education Questionnaire”, to assess evolution acceptance and knowledge, as well as infuencing factors on evolution acceptance.
Ključne besede: evolucija, znanje, visokošolsko izobraževanje, ocenjevanje, Evropa, evolution, acceptance, knowledge, multilevel modeling, socioscientific issues, religious faith, higher education, Europe, assessment, attitude
Objavljeno v DKUM: 02.09.2022; Ogledov: 423; Prenosov: 8
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Numerical analysis of fluid flow in a vial : [master thesis]
Žiga Časar, 2019, magistrsko delo

Opis: Lyophilization or freeze-drying is a widely used process in the pharmaceutical and food industry. In the process the solvent will be removed under extreme conditions of low temperature and low system pressures, whereby sublimation happens, the transition from the solid phase to the gas phase, with skipping the liquid phase, which happens bellow the triple point. This study focuses on numerical modeling at the start of the process, the so called primary drying. For this stage the highest mass flow rates of vapor are typical, since the driving force of the process is the pressure difference between the sublimation front and surrounding area. In this stage the non-bonded solvent is removed. Because of the extreme conditions the typical computational fluid dynamics approach is not suitable anymore and has to be corrected. One way to do this is to use additional models for fluid behavior at the solid wall. The study focuses on the influence of different boundary conditions on the solid wall, No-Slip, Free Slip and Maxwell Slip, and their effect on fluid flow inside the vial. A quantitative and qualitative comparison of the results is presented.
Ključne besede: Lyophilization, Knudsen number, computational fluid dynamics, fluid flow, numerical modeling, slip boundary condition
Objavljeno v DKUM: 09.07.2019; Ogledov: 1344; Prenosov: 187
.pdf Celotno besedilo (2,66 MB)

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