1. Podjetniška demografija in dinamika podjetij različnih tehnoloških ravni, znanja in razvojnih faz : Slovenski podjetniški observatorij 2024Barbara Bradač Hojnik, Matej Rus, Dijana Močnik, 2025 Abstract: Slovenski podjetniški observatorij 2024 prinaša celovito analizo podjetniške demografije ter dinamike podjetij različnih tehnoloških ravni, znanja in razvojnih faz. V prvem delu raziskave smo proučili ključne demografske značilnosti slovenskih podjetij, vključno z njihovim številom, velikostjo, prihodki, stroški dela in dodano vrednostjo, razčlenjeno po dejavnostih, regijah in velikostnih razredih. Drugi del raziskave se osredotoča na podjetja z različno stopnjo tehnološke intenzivnosti in na znanju temelječe storitve, s poudarkom na primerjavi Slovenije z EU. Posebej smo analizirali podjetja v različnih fazah življenjskega cikla, da bi prepoznali njihove konkurenčne prednosti, razvojne izzive ter priložnosti za nadaljnjo rast in inovacije. Na podlagi ugotovitev smo podali strateške usmeritve za izboljšanje podpornega okolja, spodbujanje inovacij, digitalne preobrazbe in internacionalizacije slovenskih podjetij, kar je ključno za dolgoročno konkurenčnost gospodarstva.
Keywords: gospodarske družbe, samostojni podjetniki, kazalniki finančne uspešnosti, visokotehnološka podjetja, na znanju temelječa podjetja, značilnosti, priložnosti in ovire, strategije in politike, empirična analiza
Published in DKUM: 17.04.2025; Views: 0; Downloads: 0
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2. Assessing the effects of a hydropower plant basin on fish spawning in an upstream river tributaryGorazd Hren, Andrej Predin, Matej Fike, Marko Pezdevšek, 2024, original scientific article Abstract: This paper presents a combined modeling approach to evaluate the ecological effects on the habitat of an upstream tributary of a river with a series of hydropower plants. The influence is investigated of the last planned hydropower plant to be built, which has a large impact on the river ecosystem. The new hydropower plant basin will affect the tributary with hydropeaking in the upstream basin. A simulation was conducted of spawning conditions for two protected fish species. The analysis combined a hydro-morphological model with a fish module that considers the water depth and velocity necessary for fish reproduction. The different river discharge scenarios were simulated, incorporating the hydropeaking effects of the new hydropower plant basin on the upstream tributary. With the new hydropower plant, sustainable measures are planned to prevent the damaging negative impacts that could lead to the degradation of the river ecosystem and the destruction of the existing ecosystem at the river’s confluence. The results indicate that, after the hydropower plant begins operation, the habitat`s suitability will decrease, and the planned sustainable measures will not provide a fully satisfactory solution.
Keywords: environmental impact, habitat sustainability, hydro-dynamic model
Published in DKUM: 11.04.2025; Views: 0; Downloads: 6
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3. Numerična analiza aerodinamike vozila z metodo vstavljenega telesaRok Čeh, 2024, undergraduate thesis Abstract: Tema diplomskega dela je numerična analiza aerodinamike vozila z uporabo metode vstavljenega telesa, s katero želimo prikazati razliko v koeficientu zračnega upora pri različnih oblikah vozil. Analiza je bila izvedena na primeru aerodinamike vozila brez in z usmerjevalniki zračnega toka, katerega glavna funkcija je zmanjšanje koeficienta upora in je pritrjeno na podvozje vozila pred sprednjimi kolesi. Simulaciji sta bili izvedeni pri enaki hitrosti 130 km/h. Na podlagi dobljenih rezultatov smo ugotovili, da z omenjeno metodo vstavljenega telesa lahko prikažemo razliko v koeficientih upora pri različnih oblikah vozil.
Keywords: numerična analiza, računalniška dinamika tekočin (RDT), metoda vstavljenega telesa, aerodinamika, koeficient upora, usmerjevalniki
Published in DKUM: 11.04.2025; Views: 0; Downloads: 4
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4. A HepG2 cell-based biosensor that uses stainless steel electrodes for hepatotoxin detectionMartin Rozman, Zala Štukovnik, Ajda Sušnik, Amirhossein Pakseresht, Matej Hočevar, Damjana Drobne, Urban Bren, 2022, original scientific article Abstract: Humans are frequently exposed to environmental hepatotoxins, which can lead to liver
failure. Biosensors may be the best candidate for the detection of hepatotoxins because of their high
sensitivity and specificity, convenience, time-saving, low cost, and extremely low detection limit. To
investigate suitability of HepG2 cells for biosensor use, different methods of adhesion on stainless
steel surfaces were investigated, with three groups of experiments performed in vitro. Cytotoxicity
assays, which include the resazurin assay, the neutral red assay (NR), and the Coomassie Brilliant Blue
(CBB) assay, were used to determine the viability of HepG2 cells exposed to various concentrations of
aflatoxin B1 (AFB1) and isoniazid (INH) in parallel. The viability of the HepG2 cells on the stainless
steel surface was quantitatively and qualitatively examined with different microscopy techniques. A
simple cell-based electrochemical biosensor was developed by evaluating the viability of the HepG2
cells on the stainless steel surface when exposed to various concentrations of AFB1 and INH by using
electrochemical impedance spectroscopy (EIS). The results showed that HepG2 cells can adhere to the
metal surface and could be used as part of the biosensor to determine simple hepatotoxic samples.
Keywords: HepG2 cell line, impedance biosensor, adhesion, hepatotoxins, stainless steel
Published in DKUM: 10.04.2025; Views: 0; Downloads: 3
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5. A computational model for analysing the wear behaviour of polymer gearsAljaž Ignatijev, Srečko Glodež, Aleš Belšak, Matej Borovinšek, 2025, original scientific article Abstract: In the presented study, a computational model was developed to analyse the wear behaviour of contacting mechanical elements like gears, bearings, etc. The model was built in the framework of the PrePoMax open-source CalculiX FEM (Finite Element Method) solver and enables a detailed analysis of the meshing dynamics of contacting mechanical elements. The model also considers the hyperelastic behaviour of the material in contact and the impact of operating temperature. The developed computational model was evaluated on a spur gear pair, where the pinion made of POM (Polyoxymethylene) was meshed with a support gear made of case-hardened steel 16MnCr5. The computational results were compared with the analytical results according to the VDI 2736 guidelines and experimental results on the real gear pairs. Compared to the standardised procedure according to the VDI 2736 guidelines, the model's main advantage is the geometry updating after a chosen number of loading cycles, enabling a more accurate prediction of wear behaviour under rolling/sliding loading conditions.
Keywords: wear, polymer gears, computational modelling, experimental testing
Published in DKUM: 08.04.2025; Views: 0; Downloads: 6
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6. Ranking as a procedure for selecting a replacement variable in the score predicting the survival of patients treated with curative intent for colorectal liver metastasesIrena Plahuta, Matej Mencinger, Iztok Peruš, Tomislav Magdalenić, Špela Turk, Aleks Brumec, Stojan Potrč, Arpad Ivanecz, 2023, original scientific article Abstract: Background and Objectives: The issue of a missing variable precludes the external validation of many prognostic models. For example, the Liverpool score predicts the survival of patients undergoing surgical therapy for colorectal liver metastases, but it includes the neutrophil–lymphocyte ratio, which cannot be measured retrospectively.
Materials and Methods: We aimed to find the most appropriate replacement for the neutrophil–lymphocyte ratio. Survival analysis was performed on data representing 632 liver resections for colorectal liver metastases from 2000 to 2020. Variables associated with the Liverpool score, C-reactive protein, albumins, and fibrinogen were ranked. The rankings were performed in four ways: The first two were based on the Kaplan-Meier method (log-rank statistics and the definite integral ��
between two survival curves). The next method of ranking was based on univariate and multivariate Cox regression analyses.
Results: The ranks were as follows: the radicality of liver resection (rank 1), lymph node infiltration of primary colorectal cancer (rank 2), elevated C-reactive protein (rank 3), the American Society of Anesthesiologists Classification grade (rank 4), the right-sidedness of primary colorectal cancer (rank 5), the multiplicity of colorectal liver metastases (rank 6), the size of colorectal liver metastases (rank 7), albumins (rank 8), and fibrinogen (rank 9).
Conclusions: The ranking methodologies resulted in almost the same ranking order of the variables. Elevated C-reactive protein was ranked highly and can be considered a relevant replacement for the neutrophil–lymphocyte ratio in the Liverpool score. These methods are suitable for ranking variables in similar models for medical research.
Keywords: colorectal cancer, liver metastases, inflammation, ranking, survival
Published in DKUM: 07.04.2025; Views: 0; Downloads: 2
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7. Perception of personal participation of the nurses in resuscitation procedures : a qualitative studyAnton Koželj, Maja Strauss, Vita Poštuvan, Anže Strauss Koželj, Matej Strnad, 2024, original scientific article Abstract: Background and Objectives: Resuscitation is one of the most stressful tasks in emergency medicine. The participation of nurses in this procedure can have specific effects on them. In this research, we wanted to find out what these effects are.
Materials and Methods: A qualitative approach by conducting semi-structured interviews was used, and a thematic data analysis of the recorded interviews was carried out. The collected data were transcribed verbatim, with no corrections to the audio recordings. The computer program ATLAS.ti 22 was used for the qualitative data analysis.
Results: Eleven male registered nurses were interviewed, with an average of 18.5 years of experience working in a prehospital environment (max. 32/min. 9). A total of 404 min of recordings were analyzed, and 789 codes were found, which were combined into 36 patterns and 11 themes. As the most stressful situations, the interviewees pointed out the resuscitation of a child, familiar persons, conflicts with the environment, conflicts within the resuscitation team, nonfunctioning or insufficient equipment, complications during resuscitation, and resuscitating a person only for training. As positive effects, the interviewees cited successful resuscitations or their awareness that, despite an unsuccessful resuscitation, they did everything they could.
Conclusions: Participation in these interventions has a specific positive or negative impact on the performers. The interviewees shared the opinion that they can cope effectively with the adverse or stressful effects of resuscitation. Yet, despite everything, they allow the possibility of subconscious influences of this intervention on themselves.
Keywords: resuscitation, personal experiences, paramedics, prehospital environment
Published in DKUM: 07.04.2025; Views: 0; Downloads: 3
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8. Perceptions of patient safety culture among triage nurses in the emergency department : a cross-sectional studyZvonka Fekonja, Sergej Kmetec, Nataša Mlinar Reljić, Jožica Černe Kolarič, Majda Pajnkihar, Matej Strnad, 2023, original scientific article Abstract: The patient safety culture is key to ensuring patient safety in healthcare organizations. The triage environment is inherently demanding for patient safety and is characterized by high stress, rapid decision-making, and quick action. In several countries, including Slovenia, there is a lack of studies on the patient safety culture among triage nurses. This study aimed to assess the perceptions of the patient safety culture among triage nurses. A cross-sectional survey design was used. The Emergency Medical Services-Safety Attitudes Questionnaire, distributed to triage nurses, was used to collect data. A total of 201 triage nurses participated in this study. The results revealed that the overall average perception of the patient safety culture was 57.27% (SD = 57.27), indicating that the perception of the patient safety culture among triage nurses in the emergency department was non-positive and requires improvement. “Job Satisfaction” received the highest score (63.18%; SD = 17.19), while “Working Conditions” received the lowest (49.91%; SD = 17.37). The perception of positive and negative safety culture responses was statistically significant for age (χ2 (3) = 17.750, p ≤ 0.001), education (χ2 (2) = 6.957, p = 0.031) and length of working experience (χ2 (3) = 8.875, p = 0.031). The findings emphasize the significance of improving the safety culture in relation to several areas of patient care during the triage process. This research serves as a crucial foundation for enhancing patient safety in triage, providing quality care, and reducing adverse events.
Keywords: triage, patient safety, perception, safety management, emergency medical services
Published in DKUM: 07.04.2025; Views: 0; Downloads: 1
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9. The learning curve of laparoscopic liver resection utilising a difficulty scoreArpad Ivanecz, Irena Plahuta, Matej Mencinger, Iztok Peruš, Tomislav Magdalenić, Špela Turk, Stojan Potrč, 2022, original scientific article Abstract: Background: This study aimed to quantitatively evaluate the learning curve of laparoscopic liver resection (LLR) of a single surgeon.
Patients and methods: A retrospective review of a prospectively maintained database of liver resections was conducted. 171 patients undergoing pure LLRs between April 2008 and April 2021 were analysed. The Halls difficulty score (HDS) for theoretical predictions of intraoperative complications (IOC) during LLR was applied. IOC was defined as blood loss over 775 mL, unintentional damage to the surrounding structures, and conversion to an open approach. Theoretical association between HDS and the predicted probability of IOC was utilised to objectify the shape of the learning curve.
Results: The obtained learning curve has resulted from thirteen years of surgical effort of a single surgeon. It consists of an absolute and a relative part in the mathematical description of the additive function described by the logarithmic function (absolute complexity) and fifth-degree regression curve (relative complexity). The obtained learning curve determines the functional dependency of the learning outcome versus time and indicates several local extreme values (peaks and valleys) in the learning process until proficiency is achieved.
Conclusions: This learning curve indicates an ongoing learning process for LLR. The proposed mathematical model can be applied for any surgical procedure with an existing difficulty score and a known theoretically predicted association between the difficulty score and given outcome (for example, IOC).
Keywords: difficulty score, learning curve, laparoscopy, hepatectomy, intraoperative complications, surgical procedures
Published in DKUM: 07.04.2025; Views: 0; Downloads: 2
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10. Dodajalne tehnologije pri razvoju in oskrbi z individualno izdelanimi medicinskimi pripomočki : magistrsko deloMatej Nose, 2025, master's thesis Abstract: V magistrskem delu sem raziskoval uporabo dodajalnih tehnologij, predvsem 3D tiskanja, pri izdelavi individualnih medicinskih pripomočkov. Tradicionalni postopki so zamudni in dragi, zato sem preučil tehnologije, kot so SLS, MJF, SLA in FDM, ter primerjal lastnosti materialov. Analiziral sem tudi zakonodajne zahteve (MDR, ISO). V eksperimentalnem delu sem analiziral postopke 3D skeniranja, modeliranja in tiskanja medicinskega pripomočka ter ocenil njegove mehanske lastnosti po standardu ISO 10328. Rezultati kažejo, da so 3D natisnjeni pripomočki primerljivi ali boljši od tradicionalnih, kar potrjuje njihov potencial v medicini.
Keywords: dodajalne tehnologije, 3D tisk, protetika, ortotika, umetni ud, zakonodaja
Published in DKUM: 31.03.2025; Views: 0; Downloads: 9
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