1. Experimental testing and numerical bite simulation of complete acrylic dentures in eugnathic and progenic occlusal relationshipsMartin Pavlin, Robert Ćelić, Nenad Gubeljak, Jožef Predan, 2025, original scientific article Abstract: Complete dentures are exposed to complex masticatory forces that may lead to material fatigue and eventual structural failure. Occlusal relationships, such as eugnathic and progenic, influence the distribution of these forces significantly. Understanding their biomechanical impact is essential for improving denture design and longevity. The aim of this study was to evaluate the mechanical behaviour of complete dentures under bite loads in eugnathic and progenic occlusal relationships, using both experimental testing and numerical simulations. The focus was placed on identifying the conditions that lead to initial damage and the patterns of stress distribution. The material properties of the denture base and artificial teeth were determined through experimental tensile and compressive testing on cylindrical PMMA specimens. The denture geometry was acquired via 3D tomography based on impressions of an edentulous patient. Experimental testing of the denture bite was conducted to determine the force thresholds at which the initial cracks occur. Numerical simulations were carried out using finite element analysis at bite loads of 100 N and 200 N in both occlusal types, incorporating the obtained material parameters. The experimental results showed that the first signs of denture damage occurred at 6400 N in eugnathic occlusion and 7010 N in progenic occlusion. The numerical simulations confirmed that, during occlusion, the pressure is redistributed across multiple contact points, with a broader distribution reducing the localised stress. This redistribution was more efficient in eugnathic occlusion, which reduced the risk of longitudinal cracking in acrylic teeth. In contrast, progenic occlusion showed higher susceptibility to fractures within the acrylic denture base, particularly between adjacent teeth. Both the experimental and numerical approaches demonstrated that occlusal relationships affect the mechanical resilience of complete dentures directly. The findings highlight that eugnathic occlusion offers biomechanical advantages in stress distribution, potentially reducing the risk of fracture. Incorporating occlusal analysis into denture design protocols can enhance clinical outcomes and improve prosthetic longevity.
Keywords: bite force, finite element method, dental biomechanics, numerical simulations, complete acrylic dentures, occlusal force distribution, occlusal pressure distribution
Published in DKUM: 11.06.2025; Views: 0; Downloads: 2
 Full text (8,19 MB)
This document has many files! More... |
2. Optimizing digital image quality for improved skin cancer detectionBogdan Dugonik, Marjan Golob, Marko Marhl, Aleksandra Vučinič Dugonik, 2025, original scientific article Abstract: The rising incidence of skin cancer, particularly melanoma, underscores the need for improved diagnostic tools in dermatology. Accurate imaging plays a crucial role in early detection, yet challenges related to color accuracy, image distortion, and resolution persist, leading to diagnostic errors. This study addresses these issues by evaluating color reproduction accuracy across various imaging devices and lighting conditions. Using a ColorChecker test chart, color deviations were measured through Euclidean distances (∆E*, ∆C*), and nonlinear color differences (∆E00, ∆C00), while the color rendering index (CRI) and television lighting consistency index (TLCI) were used to evaluate the influence of light sources on image accuracy. Significant color discrepancies were identified among mobile phones, DSLRs, and mirrorless cameras, with inadequate dermatoscope lighting systems contributing to further inaccuracies. We demonstrate practical applications, including manual camera adjustments, grayscale reference cards, post-processing techniques, and optimized lighting conditions, to improve color accuracy. This study provides applicable solutions for enhancing color accuracy in dermatological imaging, emphasizing the need for standardized calibration techniques and imaging protocols to improve diagnostic reliability, support AI-assisted skin cancer detection, and contribute to high-quality image databases for clinical and automated analysis.
Keywords: dermoscopy, melanoma, color analysis, color error, spectral power distribution, grey card, digital imaging standards
Published in DKUM: 08.04.2025; Views: 0; Downloads: 4
Full text (5,63 MB) |
3. Measuring system for determining the quality of LED light sources and an overview of LED light bulbs for household useMatic Markovič, Andrej Orgulan, Primož Sukič, 2022, original scientific article Abstract: Modern LED light sources have many advantages, as well as some disadvantages. One of
the disadvantages is the pulsating luminous flux, which, in some cases, affects people’s health and
well-being negatively. The paper describes the design and making process of a measuring system
for determining the quality of LED substitutes for conventional light bulbs and gives an overview
of LED light bulbs for household use. The measurement system is controlled using the MATLAB
software environment, in which data processing and plotting of the results are also performed. We
acquired 59 different LED light bulbs from 37 manufacturers, and performed the measurements.
The light bulbs are classified based on the percentage of fluctuations in the luminous flux, and the
percentage of deviation of the measured luminous flux compared to the value stated on the packaging
by the manufacturer.
Keywords: angular distribution of light, fluctuations in the luminous flux, LED light quality, measuring system, Red Pitaya
Published in DKUM: 01.04.2025; Views: 0; Downloads: 5
Full text (11,80 MB)
This document has many files! More... |
4. True Hamsters (Cricetinae) of the Palaearctic RegionBoris Kryštufek, Georgy Isidorovich Shenbrot, 2025 Abstract: True hamsters are a small subfamily (Cricetinae) containing only 19 species which are endemic to the Palaearctic region. Despite such low species richness, general public is well familiar with hamsters, primarily knowing them as pets, experimental laboratory animals and species of conservation concern. The present work is a compilation integrating achievements of the genomic era with the traditional taxonomy. The aim was to provide an authoritative and up-to-date taxonomic guide to the animal group, which is of great interest to experts engaged in medical zoology, epidemiology, biostratigraphy, zooarchaeology, evolutionary research, population ecology, animal systematics, biodiversity conservation, museum collection management and many more biological subdisciplines. The most significant original contribution is perhaps revision of the family-group taxa with naming 2 new subtribes and 2 new tribes. The text is supplemented by 120 illustrations and over 700 references. Morphological details of skull and dentition of each of the 19 species are depicted, and their distributions are mapped in detail. The book will allow the user to interpret intelligently the taxonomic system of Cricetinae and to follow taxonomic progress with a critical eye.
Keywords: taxonomy, nomenclature, morphology, karyology, molecular systematics, species delimitation, subspecies, zoogeography, distribution modelling
Published in DKUM: 14.01.2025; Views: 0; Downloads: 42
Full text (38,96 MB)
This document has many files! More... |
5. Factors influencing habitat selection of three cryptobenthic clingfish species in the shallow North Adriatic SeaDomen Trkov, Danijel Ivajnšič, Marcelo Kovačić, Lovrenc Lipej, 2021, original scientific article Abstract: Cryptobenthic fishes were often overlooked in the past due to their cryptic lifestyle, so knowledge of their ecology is still incomplete. One of the most poorly studied taxa of fishes in the Mediterranean Sea is clingfish. In this paper we examine the habitat preferences of three clingfish species (Lepadogaster lepadogaster, L. candolii, and Apletodon incognitus) occurring in the Gulf of Trieste (Northern Adriatic). The results show that all three species have a cryptic lifestyle and are well-segregated based on their depth distribution and macro- and microhabitat preferences. L. lepadogaster inhabits shallow waters of the lower mediolittoral and upper infralittoral, where it occurs on rocky bottoms under stones. L. candolii similarly occurs in the rocky infralittoral under stones, but below the lower distribution limit of L. lepadogaster, and in seagrass meadows, where it occupies empty seashells. Such hiding places in seagrass meadows are also occupied by A. incognitus, which mostly occurs below the lower distribution limit of L. candolii. Despite the overlap of depth and macrohabitat, the probability of individuals of two species encountering each other or competing in the same habitat is low when the depth range is combined with the microhabitat preferences of these species.
Keywords: cryptobenthic fish, clingfish, habitat selection, depth distribution, Lepadogaster lepadogaster, Lepadogaster candolii, Apletodon incognitus
Published in DKUM: 18.10.2024; Views: 0; Downloads: 7
Full text (4,40 MB)
This document has many files! More... |
6. Agrowellness goods distribution in the light of sustainability : the consumer perspective and the case of slovenia’s eastern cohesion regionLazar Pavić, Milica Rančić Demir, 2024, original scientific article Abstract: This study explores the distribution of agrowellness products and services from a sustainability perspective, focusing on consumer perceptions in Slovenia’s Eastern Cohesion Region. Utilizing an empirical approach through an online survey, the research assesses how sustainable lifestyle practices influence the frequency of agrowellness goods consumption and their perceived availability. The study employs structural equation modeling (SEM) to test four hypotheses, revealing that sustainable lifestyle practices positively affect the frequency of agrowellness product usage, enhancing the perception of product availability. A critical novel contribution of the research is identifying sociodemographic factors as significant moderators of these relationships, offering more profound insights into consumer behavior. Additionally, the frequency of use mediates the link between a sustainable lifestyle and perceived availability, with gender, age, education, and the place of residence as essential moderators. The findings contribute to theory and practice, offering actionable recommendations for marketing and distribution strategies to enhance the accessibility and appeal of agrowellness products. These insights provide valuable guidance for stakeholders in agriculture, rural development, and wellness tourism, with broader implications for policy development aimed at promoting sustainable lifestyles and supporting rural economies.
Keywords: agrowellness, sustainability, consumer behavior, rural development, wellness tourism, distribution, supply chain, Slovenia
Published in DKUM: 11.10.2024; Views: 0; Downloads: 6
Full text (445,75 KB) |
7. A sustainable distribution model for agrowellness: strategies for tourist farm innovation and growthTina Cvahte Ojsteršek, Lazar Pavić, 2024, original scientific article Abstract: The concepts of “agrotourism” (or agritourism), focusing on farm-based tourism, and “wellness tourism,” which emphasises health and well-being through travel, are common and well-researched. As the paper explores, this combination presents a strategic approach to enhance the tourist farms’ offer by aligning it with contemporary desires for health, relaxation, and nature immersion. Based on exploring the existing offerings on tourist farms in rural Slovenia and a survey among potential users, we identified some aspects of why agrowellness is not yet developed to the extent one would expect. Focusing on six main areas—local identity, sustainability, community engagement, innovation, digitalisation, and sports activities— the developed distribution model outlines what steps farms can take to reach a broader audience and contribute to sustainable development. By integrating authentic local experiences, eco-friendly practices, community collaboration, innovative activities, a robust digital presence, and opportunities for active outdoor recreation, tourist farms can offer unique, enriching experiences that appeal to modern tourists seeking wellness and connection with nature in the spirit of agrowellness. This comprehensive strategy aims to elevate the agrowellness sector’s appeal. It supports the preservation of rural heritage and promotes healthy lifestyles, positioning tourist farms as crucial players in a sustainably focused tourism industry.
Keywords: agrowellness, distribution, tourist farms, innovation, wellness tourism
Published in DKUM: 11.10.2024; Views: 0; Downloads: 4
Full text (170,30 KB) |
8. Why are there six degrees of separation in a social network?I. Samoylenko, D. Aleja, E. Primo, Karin Alfaro-Bittner, E. Vasilyeva, K. Kovalenko, D. Musatov, A. M. Raigorodskii, R. Criado, M. Romance, David Papo, Matjaž Perc, B. Barzel, Stefano Boccaletti, 2023, original scientific article Abstract: A wealth of evidence shows that real-world networks are endowed with the small-world property, i.e., that the maximal distance between any two of their nodes scales logarithmically rather than linearly with their size. In addition, most social networks are organized so that no individual is more than six connections apart from any other, an empirical regularity known as the six degrees of separation. Why social networks have this ultrasmall-world organization, whereby the graph’s diameter is independent of the network size over several orders of magnitude, is still unknown. We show that the “six degrees of separation” is the property featured by the equilibrium state of any network where individuals weigh between their aspiration to improve their centrality and the costs incurred in forming and maintaining connections. We show, moreover, that the emergence of such a regularity is compatible with all other features, such as clustering and scale-freeness, that normally characterize the structure of social networks. Thus, our results show how simple evolutionary rules of the kind traditionally associated with human cooperation and altruism can also account for the emergence of one of the most intriguing attributes of social networks.
Keywords: degree distribution, network evolution, complex network, small-world network, social physics
Published in DKUM: 16.07.2024; Views: 111; Downloads: 18
Full text (876,16 KB)
This document has many files! More... |
9. |
10. Review of Antlions (Insecta: Neuroptera: Myrmeleontidae) in North MacedoniaDušan Devetak, Ana Nahirnić, Predrag Jakšić, Vesna Klokočovnik, Tina Klenovšek, Davide Badano, Jan Podlesnik, 2023, original scientific article Abstract: We present the state of knowledge on the family Myrmeleontidae occurring in North Macedonia based on published records, museum specimens and new samples, and provide a comprehensive species list. North Macedonia represents only 3.9% of the area of the Balkan Peninsula but harbours 19 species belonging to 14 antlion genera, i.e., 61% of the peninsular fauna. We report collection localities, literature records and biological data for each species. Three species, Nemoleon poecilopterus, Neuroleon assimilis and Myrmeleon inconspicuus, are reported for the first time in North Macedonia. The genus Nemoleon Navás is also reported for the first time in the country.
Keywords: Myrmeleontidae, checklist, distribution, new records, Balkan Peninsula
Published in DKUM: 15.04.2024; Views: 225; Downloads: 7
Full text (497,47 KB)
This document has many files! More... |
