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1.
Universal research index : an inclusive metric to quantify scientific research output
Mahsa Keshavarz-Fathi, Niloufar Yazdanpanah, Sajad Kolahchi, Heliya Ziaei, Gary L. Darmstad, Tommaso Dorigo, Filip Dochy, Lisa Levin, Visith Thongboonkerd, Matjaž Perc, 2023, original scientific article

Abstract: Scientometrics and bibliometrics, the subfields of library and information science, deal with the quantity and quality of research outputs. Currently, various scientometric indices are being used to quantify and compare research outputs. The most widely known is the h-index. However, this index and its derivatives suffer from dependence on the mere count of a scholar's highly cited publications. To remedy this deficiency, we developed a novel index, the Universal Research Index (UR-Index) (https://usern2021.github.io/UR-Index/) by which every single publication has its own impact on the total score. We developed this index by surveying international top 1 % cited scientists in various disciplines and included additional component variables such as publication type, leading role of a scholar, co-author count, and source metrics to this scientometric index. We acknowledge that unconscious biases built into the component variables included in the UR-Index might put research from specific groups at a disadvantage, thus continued efforts to improve equitable scholarly impact in science and academia are encouraged.
Keywords: scientometrics, research impact, h-index, UR-Index, USERN, citations, impact factor, leading author
Published in DKUM: 17.06.2024; Views: 65; Downloads: 6
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Development of a local event 'Summer in Samobor'
Nika Martina Mišić, 2023, undergraduate thesis

Abstract: Events are one of the main factors of tourism development of a destination. Also, local events are one of the biggest factors that influence tourism in every town, city or community, and they are of great importance for a tourist destination. Summer in Samobor is a particularly successful new event that is in the process of development. In the theoretical part of the graduate thesis, the following topics are explained: the significance of the event, the type and size of the event, the planning and realisation of the event and the sustainability of the event. In the first part of our research, we presented the theoretical knowledge on the subject. Then we presented the event Summer in Samobor taking into account the following factors: aims and visions of the event, programme of the event, place and time of the event, registrations and permits, financial management, sponsors, media and promotion, food and beverages, and finally the sustainability of the event. As part of our research, we conducted interviews with the representative of the external agency Wanderlust Events and the representative of the Samobor Tourist Board. Using the interviews mentioned, we found out how the event developed, what factors influenced the success of the event and how sustainable the event is. The results of this research show that this event is developing every year and that the quality of the event is constantly being raised. Also, as some of the main success factors of the event Summer in Samobor, the following were emphasized: improvement of socio-cultural awareness, strong promotion of sustainable events, rich and high-quality content,uniqueness, cooperation and support of partners, good organization and creative ideas.
Keywords: event management, local event, sustainability, Samobor, factor of successful development
Published in DKUM: 23.02.2024; Views: 353; Downloads: 38
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4.
Multi-criteria measurement of ai support to project management
Vesna Čančer, Polona Tominc, Maja Rožman, 2023, original scientific article

Abstract: This paper aims to measure the level of artificial intelligence (AI) support to project management (PM) in selected service sector activities. The exploratory factor analysis was employed based on the extensive survey on AI in Slovenian companies and the multi-criteria measurement with an emphasis on value functions and pairwise comparisons in the analytic hierarchy process. The synthesis and performance sensitivity analysis results show that in the service sector, concerning all criteria, PM is with the level 0.276 best supported with AI in services of professional, scientific, and technical activities, which also stand out concerning the first-level goals in using AI solutions in a project with the value 0.284, and in successful project implementation using AI with the value 0.301. Although the lowest level of AI support to PM, which is 0.220, is in services of wholesale and retail trade and repair of motor vehicles and motorcycles, these services excel in adopting AI technologies in a project with a value of 0.277. Services of financial and insurance activities, with the level 0.257 second-ranked concerning all criteria, have the highest value of 0.269 concerning the first-level goal of improving the work of project leaders using AI. The paper, therefore, contributes to the comparison of AI support to PM in service sector activities. The results can help AI development policymakers determine which activities need to be supported and which should be set as an example. The presented methodological frame can serve to perform measurements and benchmarking in various research fields.
Keywords: artificial intelligence, factor analysis, multiple criteria, performance sensitivity, project management
Published in DKUM: 12.02.2024; Views: 325; Downloads: 24
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5.
New technique to evaluate the overall heat loss coefficient for a flat plate solar collector
Amor Bouhdjar, Hakim Semai, Aissa Amari, 2021, original scientific article

Abstract: Low-temperature solar systems mostly use flat plate solar collectors. Good design and correct dimensioning of a solar heat generator are based on precise knowledge of the characteristics of the flat plate solar collector on site. The present work considers a flat plate solar air collector, a flat plate solar water collector, and a flat plate solar water collector with air absorber cooling. The investigation intends to shed light on a procedure to determine the overall heat loss coefficient and the heat removal factor using recorded system temperatures, operating parameters, and environmental data. The Hottel-Whillier-Bliss equation gives the collector useful energy. This expression is used to generate a correlation for the collector efficiency through a linear fitting. We calculate the overall heat loss coefficient of the collector from the slope of the collector efficiency curve. However, we need to know the heat removal factor of the collector. In this study, we present a new technique to calculate the heat removal factor. Then we deduce the collector overall heat loss coefficient. Results show that, very often, the overall heat loss coefficient for the flat plate solar air collector and the flat plate solar water collector determined with this new method is higher than the one calculated with the empirical formula proposed by Klein. However, the experimental overall heat loss coefficient for the flat plate solar water collector with air absorber cooling is smaller than the one calculated with the empirical formula proposed by Klein. The analysis shows that the overall heat loss coefficient determined with the new technique seems more realistic since all phenomena occurring during the heat transfer from solar irradiance incident on the absorber plate and transmitted to the transport fluid are considered.
Keywords: flat plate solar collector, overall heat loss coefficient, heat removal factor
Published in DKUM: 10.11.2023; Views: 230; Downloads: 7
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6.
Hamiltonicity of certain cartesian products of graphs
Tjaša Paj Erker, 2022, original scientific article

Abstract: A graph is Hamiltonian if it contains a spanning cycle. In this paper, we examine the hamiltonicity of the Cartesian product of a tree with a path. We offer sufficient conditions for the Cartesian product of a tree with a path to be Hamiltonian.
Keywords: hamiltonicity, cartesian product, path factor
Published in DKUM: 26.10.2023; Views: 358; Downloads: 9
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7.
The KIDSCREEN-27 scale: translation and validation study of the Slovenian version
Leona Cilar Budler, Majda Pajnkihar, Ulrike Ravens-Sieberer, Owen Barr, Gregor Štiglic, 2022, original scientific article

Abstract: Background: There are many methods available for measuring social support and quality of life (QoL) of adolescents, of these, the KIDSCREEN tools are most widely used. Thus, we aimed to translate and validate the KIDSCREEN-27 scale for the usage among adolescents aged between 10 and 19 years old in Slovenia. Methods: A cross-sectional study was conducted among 2852 adolescents in primary and secondary school from November 2019 to January 2020 in Slovenia. 6-steps method of validation was used to test psychometric properties of the KIDSCREEN-27 scale. We checked descriptive statistics, performed a Mokken scale analysis, parametric item response theory, factor analysis, classical test theory and total (sub)scale scores. Results: All five subscales of the KIDSCREEN-27 formed a unidimensional scale with good homogeneity and reliability. The confirmatory factor analysis showed poor fit in user model versus baseline model metrics (CFI = 0.847; TLI = 0.862) and good fit in root mean square error (RMSEA = 0.072; p(χ2) < 0.001). A scale reliability was calculated using Cronbach's α (0.93), beta (0.86), G6 (0.95) and omega (0.93). Conclusions: The questionnaire showed average psychometric properties and can be used among adolescents in Slovenia to find out about their quality of life. Further research is needed to explore why fit in user model metrics is poor.
Keywords: social support, adolescent, psychometrics, factor analysis, quality of life
Published in DKUM: 23.08.2023; Views: 290; Downloads: 26
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8.
Cleavage-mediated regulation of Myd88 signaling by inflammasome-activated caspase-1
Monika Avbelj, Iva Hafner Bratkovič, Duško Lainšček, Mateja Manček Keber, Tina Tinkara Peternelj, Gabriela Panter, Steven P. Treon, Boris Gole, Uroš Potočnik, Roman Jerala, 2022, original scientific article

Abstract: Coordination among multiple signaling pathways ensures an appropriate immune response, where a signaling pathway may impair or augment another signaling pathway. Here, we report a negative feedback regulation of signaling through the key innate immune mediator MyD88 by inflammasome-activated caspase-1. NLRP3 inflammasome activation impaired agonist- or infection-induced TLR signaling and cytokine production through the proteolytic cleavage of MyD88 by caspase-1. Site-specific mutagenesis was used to identify caspase-1 cleavage site within MyD88 intermediary segment. Different cleavage site location within MyD88 defined the functional consequences of MyD88 cleavage between mouse and human cells. LPS/monosodium urate–induced mouse inflammation model corroborated the physiological role of this mechanism of regulation, that could be reversed by chemical inhibition of NLRP3. While Toll/interleukin-1 receptor (TIR) domain released by MyD88 cleavage additionally contributed to the inhibition of signaling, Waldenström’s macroglobulinemia associated MyD88L265P mutation is able to evade the caspase-1-mediated inhibition of MyD88 signaling through the ability of its TIRL265P domain to recruit full length MyD88 and facilitate signaling. The characterization of this mechanism reveals an additional layer of innate immunity regulation.
Keywords: Myeloid differentiation factor 88, Myd88, caspase-1, inflammasomes, regulation, innate immunity, inflammation
Published in DKUM: 16.08.2023; Views: 489; Downloads: 31
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9.
Fine-tuning cardiac insulin-like growth factor 1 receptor signaling to promote health and longevity
Mahmoud Abdellatif, Viktoria Herbst, Alexander Martin Heberle, Alina Humnig, Tobias Pendl, Sylvère Durand, Giulia Cerrato, Sebastian J Hofer, Moydul Islam, Julia Voglhuber, Simon Sedej, 2022, original scientific article

Abstract: Background: The insulin-like growth factor 1 (IGF1) pathway is a key regulator of cellular metabolism and aging. Although its inhibition promotes longevity across species, the effect of attenuated IGF1 signaling on cardiac aging remains controversial. Methods: We performed a lifelong study to assess cardiac health and lifespan in 2 cardiomyocyte-specific transgenic mouse models with enhanced versus reduced IGF1 receptor (IGF1R) signaling. Male mice with human IGF1R overexpression or dominant negative phosphoinositide 3-kinase mutation were examined at different life stages by echocardiography, invasive hemodynamics, and treadmill coupled to indirect calorimetry. In vitro assays included cardiac histology, mitochondrial respiration, ATP synthesis, autophagic flux, and targeted metabolome profiling, and immunoblots of key IGF1R downstream targets in mouse and human explanted failing and nonfailing hearts, as well. Results: Young mice with increased IGF1R signaling exhibited superior cardiac function that progressively declined with aging in an accelerated fashion compared with wild-type animals, resulting in heart failure and a reduced lifespan. In contrast, mice with low cardiac IGF1R signaling exhibited inferior cardiac function early in life, but superior cardiac performance during aging, and increased maximum lifespan, as well. Mechanistically, the late-life detrimental effects of IGF1R activation correlated with suppressed autophagic flux and impaired oxidative phosphorylation in the heart. Low IGF1R activity consistently improved myocardial bioenergetics and function of the aging heart in an autophagy-dependent manner. In humans, failing hearts, but not those with compensated hypertrophy, displayed exaggerated IGF1R expression and signaling activity. Conclusions: Our findings indicate that the relationship between IGF1R signaling and cardiac health is not linear, but rather biphasic. Hence, pharmacological inhibitors of the IGF1 pathway, albeit unsuitable for young individuals, might be worth considering in older adults.
Keywords: aging, autophagy, cardiomyopathies, insulin-like growth factor 1, mitochondria, mouse, phosphatidylinositol 3-kinases
Published in DKUM: 11.08.2023; Views: 448; Downloads: 41
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10.
Daylight provision requirements according to EN 17037 as a restriction for sustainable urban planning of residential developments
Nataša Šprah, Mitja Košir, 2020, original scientific article

Abstract: The attempt at a more sustainable land use by increasing urban density may have a negative effect on the daylighting of residential buildings. In densely built areas, obstructions generated by the surrounding buildings can substantially reduce the available amount of daylight, causing poorly daylit spaces and a less healthy indoor environment with higher electricity consumption as a consequence of artificial lighting. European standard EN 17037, Daylight in Buildings, was established in 2018 to ensure appropriately daylit spaces. In this paper, a three-step methodology was developed to investigate the relationship between certain urban planning parameters and the daylighting of a typical room defined by specific (Slovenian) legislative restrictions about its geometry and minimum required window to floor area ratio, in order to establish the maximum densities of residential developments still fulfilling the minimum requirements for daylight provision defined by EN 17037. The results show that a relatively low urban density is required to fulfil the stipulations for minimum daylight provision for the deepest permissible room according to the Slovenian legislation. The impact of the development floor area ratio on the daylighting potential of buildings was identified as significant, followed by the site coverage, development layout, and building typology. Furthermore, the developed methodological approach clearly demonstrates a substantial potential for application in urban planning, with indoor daylight environmental conditions being linked to the planning of residential developments in the earliest stages of the project.
Keywords: sustainable urban planning, daylighting, vertical daylight factor, residential developments, solar potential
Published in DKUM: 14.07.2023; Views: 460; Downloads: 51
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