1. Dynamic modeling and experimental validation of the photovoltaic/thermal systemKlemen Sredenšek, Eva Simonič, Klemen Deželak, Marko Bizjak, Niko Lukač, Sebastijan Seme, 2025, izvirni znanstveni članek Opis: The aim of this paper is to present a novel and comprehensive methodology for the dynamic modeling and experimental validation of a photovoltaic/thermal system. The dynamic model is divided into thermal and electrical subsystems, encompassing the photovoltaic/ thermal module and the thermal energy storage. The thermal subsystem of both the photovoltaic/thermal module and the thermal energy storage is described by a one-dimensional dynamic model of heat transfer mechanisms and optical losses, while the electrical subsystem is presented as an electrical equivalent circuit of double diode solar cell. Model validation was conducted on a modern experimental photovoltaic/thermal system over an extended operational period at a five-minute resolution, with validation days classified as sunny, cloudy, or overcast based on weather conditions, thereby demonstrating an applied approach. The results demonstrate the lowest deviation values reported to date, confirmed using six quantitative indicators. The added value of the proposed methodology, not previously addressed in the literature, lies in the following contributions: (i) comprehensive modeling of the entire photovoltaic/thermal system, (ii) accurate consideration of optical losses in the photovoltaic/thermal module, and (iii) long-term experimental validation. Overall, the proposed methodology provides a reliable and efficient framework for PV/T system design, optimization, and long-term performance assessment.
Ključne besede: photovoltaic/thermal system, thermal energy storage, dynamic modeling, experimental validation, heat transfer mechanism, temperature, electrical power
Objavljeno v DKUM: 10.11.2025; Ogledov: 0; Prenosov: 3
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2. Generating test cases for automotive requirement testingusing ragMatic Krepek, 2025, magistrsko delo Opis: The automotive industry is increasingly confronted with challenges in managing complex requirements and test cases arising from the integration of advanced electronic systems, software functionalities, and compliance with international standards. Conventional manual validation of requirements is time-consuming, error-prone, and resource-intensive, underscoring the need for more efficient and reliable approaches. This thesis investigates the automation of test case generation through the application of Retrieval-Augmented Generation (RAG) in combination with Large Language Models (LLMs). A complete RAG workflow was implemented in Python, incorporating LangChain, LangGraph, Ollama, and ChromaDB to facilitate indexing, retrieval, and generation. The system was trained and evaluated on datasets comprising automotive requirements and test cases, with experiments examining embedding quality, retrieval strategies, prompt engineering techniques, and generative model parameters. The results demonstrate that RAG is capable of generating high-quality, contextually relevant test cases on consumer-grade hardware, thereby significantly enhancing efficiency, consistency, and productivity relative to manual methods. Furthermore, the findings suggest that RAG-based systems are best positioned as complementary tools that support, rather than replace, human engineers. This research provides a foundation for future work on hybrid retrieval methods, advanced embedding techniques, and the integration of more powerful LLMs into requirement and test case management processes.
Ključne besede: Automotive requirements validation, Test case generation, Large Language Models, Retrieval-Augmented Generation
Objavljeno v DKUM: 01.10.2025; Ogledov: 0; Prenosov: 0
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3. Development and preliminary validation of the active citizen compass questionnaire : the Dutch-Flemish and Greek versionsVana Chiou, Oliver Holz, 2025, izvirni znanstveni članek Opis: This study aimed to develop a questionnaire for assessing teachers’ practices, teaching knowledge, and school practices related to active citizenship in a crossnational study. The first draft of the Active Citizen Compass (ACC) questionnaire in English was examined by an expert panel. The questionnaire was translated into Dutch and Greek, and tested for ambiguity, clarity, and user friendliness. Thereafter, the Dutch-Flemish and Greek versions were pilot tested on 54 teachers from Flanders and 63 teachers from Greece. Reliability and validity evidence indicates the ACC scales in Dutch and Greek are a reliable and valid measure of active citizenship in schools.
Ključne besede: active citizenship, questionnaire, validation, teachers, schools
Objavljeno v DKUM: 08.09.2025; Ogledov: 0; Prenosov: 6
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4. The International Work Addiction Scale (IWAS) : a screening tool for clinical and organizational applications validated in 85 cultures from six continentsEdyta Charzyńska, Nejc Plohl, 2025, izvirni znanstveni članek Opis: Background and aims: Despite the last decade’s significant development in the scientific study of work addiction/workaholism, this area of research is still facing a fundamental challenge, namely the need for a valid and reliable measurement tool that shows cross-cultural invariance and, as such, allows for worldwide studies on this phenomenon. Methods: An initial 16-item questionnaire, developed within an addiction framework, was administered alongside job stress, job satisfaction, and self-esteem measures in a total sample of 31,352 employees from six continents and 85 cultures (63.5% females, mean age of 39.24 years). Results: Based on theoretical premises and psychometric testing, the International Work Addiction Scale (IWAS) was developed as a short measure representing essential features of work addiction. The seven-item version (IWAS-7), covering all seven components of work addiction, showed partial scalar invariance across 81 cultures, while the five-item version (IWAS-5) showed it across all 85 cultures. Higher levels of work addiction on both versions were associated with higher job stress, lower job satisfaction, and lower self-esteem across cultures. The optimal cut-offs for the IWAS-7 (24 points) and IWAS-5 (18 points) were established with an overall accuracy of 96% for both versions. Discussion and conclusions: The IWAS is a valid, reliable, and short screening scale that can be used in different cultures and languages, providing comparative and generalizable results. The scale can be used globally in clinical and organizational settings, with the IWAS-5 being recommended for most practical and clinical situations. This is the first study to provide data supporting the hypothesis that work addiction is a universal phenomenon worldwide.
Ključne besede: workaholism, validation, cross-cultural studies, Bergen Work Addiction Scale, compulsive overworking, cross-cultural, work addiction
Objavljeno v DKUM: 29.08.2025; Ogledov: 0; Prenosov: 1
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7. Theoretical and experimental investigations of a water hammer in Sava river Kaplan turbine hydropower plantsAnton Bergant, Jernej Mazij, Jošt Pekolj, 2024, izvirni znanstveni članek Opis: This paper deals with critical flow regimes that may induce an unacceptable water hammer in the Sava River Kaplan turbine hydropower plants. The rigid water hammer model is introduced first. The computational results are then compared with the results of measurements in two distinct hydropower plants (HPP): (i) The refurbished and upgraded Medvode HPP, and (ii) The newest Brežice HPP. Comparisons of the computed and measured results are examined for normal operating regimes. The water hammer in the two power plants is controlled by appropriate adjustment of the wicket gates and runner blades closing/opening manoeuvres. The agreement between the computed and measured results is reasonable.
Ključne besede: hydropower plant, Kaplan turbine, Sava River, water hammer, validation
Objavljeno v DKUM: 11.04.2025; Ogledov: 0; Prenosov: 40
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8. Cross-cultural adaptation and validation of the Slovenian version of the Core outcome measures index for low back painMatevž Topolovec, David Vozlič, Nejc Plohl, Rok Vengust, Miha Vodičar, Anne Frances Mannion, 2020, izvirni znanstveni članek Opis: Background:To conduct a cross-cultural adaptation and validation of the Core Outcome Measures Index (COMI) in the Slovenian language, for use in patients with low back pain.
Methods:The English version of COMI was translated into Slovene following established guidelines. Three hundredfifty-three patients with chronic low back pain were recruited from the Orthopedic clinic department of a tertiary care teaching institution. Data quality, construct validity, responsiveness, and test-retest reliability of the COMI were assessed.
Results: The questionnaire was generally well accepted with no missing values. The majority of items exhibited only mild ceiling effects (below 20.0%) and some what more prominent floor effects, which were similar to previousstudies (4.5-78.8%). Correlations with Oswestry Disability Index (ODI) were high (= 0.76 between overall COMI andODI scores), suggesting that the Slovene version of COMI had high construct validity. Additionally, the Slovene version of COMI successfully captured surgical patients' improvement in their low back problem after surgery(overall COMI score change: Z =9.34,p< .001, r =0.53) and showed acceptable test-retest reliability (ICC = 0.86).
Conclusions:The Slovene version of COMI showed good psychometric properties, comparable to those of previously tested language versions. It represents a valuable instrument for the use in future domestic and multicenter clinical studies.
Ključne besede: low back pain, validation, core outcome measures index, cross-cultural adaptation, Slovenia
Objavljeno v DKUM: 27.12.2024; Ogledov: 0; Prenosov: 13
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9. Development and validation of the perceived deepfake trustworthiness questionnaire (PDTQ) in three languagesNejc Plohl, Izidor Mlakar, Letizia Aquilino, Piercosma Bisconti, Urška Smrke, 2025, izvirni znanstveni članek Opis: Exposure to false information is becoming a common occurrence in our daily lives. New developments in artificial intelligence are now used to produce increasingly sophisticated multimedia false content, such as deepfakes, making false information even more challenging to detect and combat. This creates expansive opportunities to mislead individuals into believing fabricated claims and negatively influence their attitudes and behavior. Therefore, a better understanding of how individuals perceive such content and the variables related to the perceived trustworthiness of deepfakes is needed. In the present study, we developed and validated the Perceived Deepfake Trustworthiness Questionnaire (PDTQ) in English, Italian, and Slovene. This was done in three phases. First, we developed the initial pool of items by reviewing previous studies, generating items via interviews and surveys, and employing artificial intelligence. Second, we shortened and adapted the questionnaire according to experts’ evaluation of content validity and translated the questionnaire into Italian and Slovene. Lastly, we evaluated the psychometric characteristics via a cross-sectional study in three languages (N ¼ 733). The exploratory factor analyses suggested a two-factor solution, with the first factor measuring the perceived trustworthiness of the content and the second measuring the perceived trustworthiness of the presentation. This factorial structure was replicated in confirmatory factor analyses. Moreover, our analyses provided support for PDTQ’s reliability, measurement invariance across all three languages, and its construct and incremental validity. As such, the PDTQ is a reliable, measurement invariant, and valid tool for comprehensive exploration of individuals’ perception of deepfake videos.
Ključne besede: deepfakes, misinformation, perception, questionnaire validation, trust
Objavljeno v DKUM: 03.09.2024; Ogledov: 30; Prenosov: 40
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10. Frailty in community-dwelling older people and nursing home residents : an adaptation and validation studySergej Kmetec, Zvonka Fekonja, Adam Davey, Barbara Kegl, Jernej Mori, Nataša Mlinar Reljić, Brendan McCormack, Mateja Lorber, 2024, izvirni znanstveni članek Opis: Aim: The aim of this was to psychometrically adapt and evaluate the Tilburg Frailty Indicator to assess frailty among older people living in Slovenia's community and nursing home settings.
Design: A cross-cultural adaptation and validation of instruments throughout the cross-sectional study.
Methods: Older people living in the community and nursing homes throughout Slovenia were recruited between March and August 2021. Among 831 participants were 330 people living in nursing homes and 501 people living in the community, and all were older than 65 years.
Results: All items were translated into the Slovene language, and a slight cultural adjustment was made to improve the clarity of the meaning of all items. The average scale validity index of the scale was rated as good, which indicates satisfactory content validity. Cronbach's α was acceptable for the total items and subitems.
Conclusions: The Slovenian questionnaire version demonstrated adequate internal consistency, reliability, and construct and criterion validity. The questionnaire is suitable for investigating frailty in nursing homes, community dwelling and other settings where older people live.
Impact:The Slovenian questionnaire version can be used to measure and evaluate frailty among older adults. We have found that careful translation and adaptation processes have maintained the instrument's strong reliability and validity for use in a new cultural context. The instrument can foster international collaboration to identify and manage frailty among older people in nursing homes and community-dwelling homes.
Reporting Method: The Strengthening the Reporting of Observational Studies in Epidemiology checklist for reporting cross-sectional studies was used.
No Patient or Public Contribution: No patient or public involvement in the design or conduct of the study. Head nurses from nursing homes and community nurses helped recruit older adults. Older adults only contributed to the data collection and were collected from nursing homes and community dwelling.
Ključne besede: aged, chronic disease, frailty, instrument validation
Objavljeno v DKUM: 17.07.2024; Ogledov: 106; Prenosov: 33
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