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2. Recent theoretical and practical contributions to the OR environment and CEJOR from the perspective of SSI-SORJanez Povh, Lidija Zadnik Stirn, Janez Žerovnik, 2025, original scientific article Abstract: The article summarizes the research topics published in this special issue. The pa- pers in this issue are based on the selected and peer-reviewed papers from the 17th International Symposium on Operations Research in Slovenia – SOR’23, which took place in Bled, Slovenia (https://arhiv.fov.um.si/sor23/), September 20–22, 2023. In addition, we examined the 27 research papers in the last two SSI-SOR CEJOR special issues, 16 in the Cent Eur J Oper Res 31, issue 3, 2023, and 11 in this CEJOR special issue, and grouped them into clusters using keywords ac- cording to the methodology published by Kastrin et al. (2021) Methodologies and applications for resilient global development from the aspect of SDI-SOR. The clusters show the main and niche topics presented and, on the one hand, illustrate the European and international state of the art in the field of OR over the last five years and, on the other hand, can serve as a stimulus for further work on upcoming strategic OR topics.
Keywords: operations research, SOR conferences, Slovenia, cluster analysis
Published in DiRROS: 19.06.2025; Views: 45; Downloads: 23
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3. Uncertainty and sensitivity analysis for hot-leg LOCA in two-loop PWRAndrej Prošek, 2025, original scientific article Abstract: Overcooling and/or pressurization events have the potential to result in pressurized thermal shock (PTS) in reactor pressure vessels of pressurized water reactors (PWRs). PTS can occur during various overcooling scenarios, including loss-of-coolant accidents (LOCAs). Thermal-hydraulic calculations of overcooling scenarios provide an input to structural analysis. The purpose of this study is to perform advanced thermal-hydraulic calculations of a hot-leg LOCA with uncertainty and sensitivity analyses. A novel approach, utilizing a fast Fourier transform–based method (FFTBM) with signal mirroring (SM), is proposed for a sensitivity study to evaluate the influence of input uncertain parameters with low computational cost before performing an uncertainty analysis. For the analysis, a break size of 45.6 cm2 (equivalent to a 76.2-mm- or 3-in.-equivalent diameter) was selected in a two-loop PWR. A verified and validated RELAP5 input deck was used. In sensitivity study 30, one-at-a-time sensitivity calculations plus reference calculation were performed. These were followed by uncertainty and sensitivity analyses using the GRS (Gesellschaft für Anlagen- und Reaktorsicherheit) Software for Uncertainty and Sensitivity Analyses (SUSA) version 4.2.6 tool, varying 15 uncertain input parameters across 208 samples. The input uncertain parameters were derived from the European Union–funded Advanced PTS Analysis for LTO (APAL) project. Three figures of merit (FOMs), reactor pressure, liquid temperature, and reactor vessel wall temperature below the cold leg connection, were analyzed. The results demonstrated that FFTBM-SM effectively identified the four most influential parameters, aligning closely with the results from the global sensitivity analysis from SUSA, which utilized 208 samples from the uncertainty analysis. Although slight differences in parameter ranking were observed, the findings validate FFTBM-SM as a valuable prescreening tool for sensitivity studies. The limitation of the sensitivity study is that it adopts a local approach. Finally, the results of the uncertainty analysis provide tolerance regions for the selected FOMs that are comparable to those obtained in the original APAL study for a four-loop PWR.
Keywords: uncertainty analysis, sensitivity analysis, FFTBM-SM, advancedthermal-hydraulic calculations of a hot-leg LOCA
Published in DiRROS: 11.06.2025; Views: 160; Downloads: 67
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4. Computational analysis of musical elements across twenty‑two European countriesLorena Mihelač, Janez Povh, 2025, original scientific article Abstract: This work examines the similarities and differences between twenty-two European countries by using the computational model Information Dynamics of Music (IDyOM) to analyze various musical elements in folk songs, children’s folk songs, and children’s songs. The examination of the (dis)similarities between 22 European countries tests two hypotheses. First, it examines whether there are significant differences in the use of musical elements between European countries that are considered to have a common musical style. Secondly, it explores whether the musical elements used in the representative music of a particular country are more similar in countries with similar cultural, political, historical and economic backgrounds and geographical proximity. The results of the research, which compared the three genres across 22 European countries, revealed significant differences that highlight the unique ways in which these genres manifest themselves and how musical elements are integrated into the musical structure, suggesting that European countries do not possess a single musical style. Furthermore, some geographically distant countries have exhibited similarities, while other geographically close countries showed dissimilarities. This implies that either there is no shared musical foundation across different countries, or that the unique variations in musical expression within certain countries have had a significant influence on the overall population.
Keywords: musical features, musical structure, computational analysis, IDyOM, representative music
Published in DiRROS: 23.05.2025; Views: 267; Downloads: 101
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5. Analysis of damage in low-velocity impact-tested GFRP-aluminum honeycomb sandwich panels using MATLABPrasanth Prabhakaran Vanaja, Jayaram Radhakrishnan Shanthi, Senthil Murugan Subramanian, Kanthavelkumaran Natesan, 2025, original scientific article Keywords: debonding, low-velocity impact, sandwich, polyester pin, MATLAB, digital image analysis
Published in DiRROS: 24.04.2025; Views: 225; Downloads: 77
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6. Unlocking high capacitive energy-density in Sm-doped ▫$Pb(Mg_{1/3}Nb_{2/3})O_3–PbTiO_3$▫ thin films via strain and domain engineeringZouhair Hanani, Jamal Belhadi, Nina Daneu, Urška Trstenjak, Nick A. Shepelin, Vid Bobnar, Thomas Lippert, Matjaž Spreitzer, 2025, original scientific article Keywords: relaxor ferroelectrics, thin films, strain analysis, electronic ceramics
Published in DiRROS: 17.04.2025; Views: 244; Downloads: 91
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7. ABIOMMED Final Progress Report : deliverable D1.4Kalliopi Pagou, Nikos Streftaris, Louisa Giannoudi, Arianna Azzellino, Roberto Carlucci, Giulia Cipriano, Emmanouil Dassenakis, Janja Francé, Katja Klančnik Židan, Borut Mavrič, 2024, final research report Keywords: biodiversity, pelagic habitats, benthic habitats, marine mammals, socio-economic analysis
Published in DiRROS: 15.04.2025; Views: 200; Downloads: 3
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8. Fracture analysis of cemented-carbide inserts for the dry cutting of repen limestoneJože Kortnik, Boštjan Markoli, Matej Zupančič, Adam Zaky, Iztok Naglič, 2025, original scientific article Keywords: cemented carbide, fracture analysis, stone cutting inserts, chainsaw machine
Published in DiRROS: 11.04.2025; Views: 253; Downloads: 99
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9. Determination of the maximum CO2 sequestration capacity of Slovenian waste ashes using thermogravimetry and calcimetrySara Tominc, Vilma Ducman, 2025, published scientific conference contribution Abstract: There are several ways to utilize as-received or pre-treated waste ash, one of the most promising is by accelerated mineral carbonation. Ashes with a high content of Ca and Mg compounds, such as ashes from wood biomass, are ideal candidates for sequestration. Due to the shift toward renewable fuels, ash from biomass as a by-product of solid fuel combustion is therefore available in huge quantities. As part of the EU AshCycle project, we have analyzed ashes from different incineration and thermal power plants to determine their carbon sequestration potential. These include various waste ashes from Slovenia, which were subjected to accelerated carbonation in a closed carbonation chamber with a CO2 concentration of 4% (v/v), 80% relative humidity and a temperature of 40 °C until maximum CO2 uptake was reached. CO2 quantification was performed using calcimetry (pressure calcimeter) and thermogravimetry. We have shown that ash from wood biomass and the co-combustion of wood waste and paper sludge have a high CO2 sequestration potential in comparison to others. The direct use of wood biomass ash for CO2 sequestration in carbonated building products could significantly benefit the circular economy, especially since 70% of wood biomass ash is still landfilled.
Keywords: CO2 sequestration capacity, accelerated carbonation, waste ashes, thermogravimetric analysis, calcimetry
Published in DiRROS: 07.04.2025; Views: 289; Downloads: 164
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10. A new perspective on the molecular dating of the brown trout complex with an extended phylogeographic information on the species in SerbiaTijana Veličković, Aleš Snoj, Vladica Simić, Radek Šanda, Jasna Vukić, Dovilė Barcytė, David Stanković, Saša Marić, 2023, original scientific article Abstract: To elucidate the historical biogeography of a species, the patterns of population divergence must be understood, and the evolutionary history of the species must be accurately known. For brown trout (Salmo trutta complex), estimating divergence times remains a challenge due to the lack of well-defined time calibration points and insufficient phylogeographic coverage in previous studies. The present work aims to improve molecular dating of mitochondrial control region sequences by using a multicalibration framework based on the latest paleogeological evidence for dating the origin of Lake Ohrid and two available Salmo fossils, including the overlooked Salmo immigratus. Our results clearly show that, contrary to common belief, the major divisions within the brown trout occurred in the Late Pliocene, not the Pleistocene. The Pliocene origin suggests that the brown trout lineages did not form because of geo(hydro)morphological changes during glaciation cycles but may be the result of orogeny and drainage evolution. In addition, increased sampling, particularly in Serbia, led to the identification of a new haplogroup (da-int) occupying an intermediate position with respect to da-es and da-bs haplogroups. While the control region can delineate brown trout lineages, its phylogenetic resolution is limited, so even extensive sampling could not further resolve the lineage level polytomies.
Keywords: brown trout, phylogeography, Pleistocene, Pliocene, calibrated phylogenetic analysis
Published in DiRROS: 04.03.2025; Views: 218; Downloads: 5322
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