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2. Participation in youth sports influences sarcopenia parameters in older adultsKaja Teraž, Miloš Kalc, Boštjan Šimunič, Uroš Marušič, Primož Pori, Saša Pišot, Rado Pišot, 2023, izvirni znanstveni članek Opis: Background: The degree of deterioration in sarcopenia parameters may be affected by a person’s level of physical activity (PA) and sedentary behavior (SB). Our study focused on examining the PA and SB of active older adults including those with and without history of sports in youth.
Methods: Forty-four participants (20 men and 24 women, mean age of total sample 76.1 ± 5.2 years) were included in analysis of PA, SB habits and sarcopenia parameters, determined by skeletal muscle index, hand-grip strength, gait speed, Timed Up and Go tests (TUG). PA and SB were recorded with accelerometers. Our primary aim was to compare participants with (AH) or without a sport history in youth (NAH), in their sarcopenia parameters and PA and SB habits.
Results: When divided participants in two groups (AH and NAH) and adjusting for age, we have detected the differences for skeletal muscle index (p = 0.007) and hand-grip strength (p = 0.004) in favor of participants who were engaged in sports in youth. We did not find any differences in PA and SB habits between the AH and NAH groups. After adjusting for age, participants with a higher number of daily steps, longer moderate to vigorous physical activity (MVPA) bouts, a higher number of MVPA bouts in a day and higher overall MVPA engagement achieved better results in hand-grip strength and TUG. Participants with lower SB had better TUG and gait speed results.
Conclusions: Our findings suggest that engaging in sports activities in youth can make a difference with sarcopenia parameters. Although we found no differences in PA and SB habits between participants with AH and NAH, participants with an athlete history performed better results in sarcopenia parameters.
Ključne besede: active ageing, muscles, muscle disorder, elderly, exercise, sedentarism
Objavljeno v DKUM: 15.04.2025; Ogledov: 0; Prenosov: 0
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3. Sensors and artificial intelligence methods and algorithms for human - computer intelligent interaction: a systematic mapping studyBoštjan Šumak, Saša Brdnik, Maja Pušnik, 2022, izvirni znanstveni članek Opis: To equip computers with human communication skills and to enable natural interaction
between the computer and a human, intelligent solutions are required based on artificial intelligence
(AI) methods, algorithms, and sensor technology. This study aimed at identifying and analyzing
the state-of-the-art AI methods and algorithms and sensors technology in existing human–computer
intelligent interaction (HCII) research to explore trends in HCII research, categorize existing evidence,
and identify potential directions for future research. We conduct a systematic mapping study of the
HCII body of research. Four hundred fifty-four studies published in various journals and conferences
between 2010 and 2021 were identified and analyzed. Studies in the HCII and IUI fields have
primarily been focused on intelligent recognition of emotion, gestures, and facial expressions using
sensors technology, such as the camera, EEG, Kinect, wearable sensors, eye tracker, gyroscope, and
others. Researchers most often apply deep-learning and instance-based AI methods and algorithms.
The support sector machine (SVM) is the most widely used algorithm for various kinds of recognition,
primarily an emotion, facial expression, and gesture. The convolutional neural network (CNN)
is the often-used deep-learning algorithm for emotion recognition, facial recognition, and gesture
recognition solutions.
Ključne besede: human–computer intelligent interaction, intelligent user interfaces, IUI, sensors, artificial intelligence
Objavljeno v DKUM: 31.03.2025; Ogledov: 0; Prenosov: 3
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4. Effect of topological optimisation on the kinetic properties of the kinematic chain : Elektronski virBoštjan Harl, 2025, izvirni znanstveni članek Opis: The paper addresses the importance of topology and shape optimisation on improving the performance of a device operating in a mine industry. The process of increasing the stiffness and the value of the first eigenfrequency of the load-carrying structure will be demonstrated. In order to satisfy both objectives simultaneously, two initial optimisation domain models were introduced. The first was the most commonly used optimisation model with full material, while the second was a model with an initial gyroid lattice structure in the optimisation domain. The results obtained by the optimisation of the load-carrying structure were used to analyse the effect of stiffness and eigenfrequency on the four-bar mechanism path of the coupler point and the reduction of the value of the joint forces of the most loaded links. 24 refs.
Ključne besede: topology optimisation, shape optimisation, eigenfrequency, kinematic chain
Objavljeno v DKUM: 27.03.2025; Ogledov: 0; Prenosov: 8
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5. Discrete time model for process meta language with fictitious-clockBoštjan Vlaovič, Aleksander Vreže, 2022, izvirni znanstveni članek Opis: Industries like telecommunications, medical, automotive, military, avionics, and aerospace
use complex real-time systems. Specification and Description Language (SDL) is one of the leading
domain specific languages that is formally defined by international standards and well established in
describing such systems. To check system properties abstracted model of the system is prepared in
selected modeling language. We use Spin (Simple Promela Interpreter) model checker that is one of
the leading tools for verification of complex concurrent and reactive systems. This paper focuses on
modeling the SDL timer construct. It is one of the SDL constructs that is not easily modeled with
Promela, but is present in many SDL systems. After an overview of the related work we propose
a new Discrete Time Model for Promela (DTMP) that is seamlessly integrated in our framework
for modeling SDL systems and can be used with the mainstream version of the Spin tool. To the
best of our knowledge, this is not possible with the existing solutions. We describe how DTMP can
be used to model SDL systems that use timers. Experimental results demonstrate its applicability
to non-SDL systems with Fischer’s mutual exclusion protocol and the Parallel Acknowledgment
with Retransmission that were used in prior studies. We compare state-space requirements with
one of the existing solutions DT Promela and DT Spin. With that, virtues and shortcomings of this
high-level solution are exposed. We have shown that DTMP is effective when an extensive range of
timer expiration values are used, which is usually the case in real-life SDL systems.
Ključne besede: formal specifications, formal languages, discrete time, model checking, automated extraction, SDL, Promela, SpinRCP, Sdl2pml
Objavljeno v DKUM: 27.03.2025; Ogledov: 0; Prenosov: 2
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6. Testiranje dostopnosti spletnih strani z avtomatskim orodjem za testiranje in orodjem za programsko testiranje : magistrsko deloAnže Kozole, 2025, magistrsko delo Opis: Osebe z ovirami predstavljajo 16 % celotnega prebivalstva, oviranost pa jim povzroča otežen dostop in uporabo spletnih vsebin. Razvijalci morajo poskrbeti, da so te vsebine dostopne komurkoli ne glede na oviranost. Težava nastopi, ko razvijalci ne poznajo pristopov testiranja dostopnosti, WCAG smernic in primernega orodja, zato so v magistrskem delu primerjana testiranja dostopnosti z avtomatskima orodjema Lighthouse in WAVE, programskim Playwright in AI orodjem AccessiBe. Opravljen je pregled literature, pridobljeni so rezultati testiranja dostopnosti spletne strani, ti rezultati pa so med seboj tudi primerjani. Predstavljen je pristop, ki ga lahko razvijalci uporabijo za hitrejšo pripravo programskega testiranja. Ugotovljeno je bilo, da je za učinkovitejše testiranje dostopnosti priporočena uporaba dveh ali več pristopov. Prav tako programsko in AI orodje testira več elementov in ima v primerjavi z avtomatskima orodjema manj napačnih rezultatov.
Ključne besede: testiranje spletne dostopnosti, AI dostopnost, W3C, WCAG
Objavljeno v DKUM: 27.03.2025; Ogledov: 0; Prenosov: 8
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7. Analysis of synchronous generators’ local mode eigenvalues in modern power systemsJožef Ritonja, Boštjan Polajžer, 2022, izvirni znanstveni članek Opis: New energy sources, storage facilities, power electronics devices, advanced and complex
control concepts, economic operating doctrines, and cost-optimized construction and production of
machines and equipment in power systems adversely affect small-signal stability associated with local
oscillations. The objective of the article is to analyze local oscillations and the causes that affect them in
order to reduce their negative impact. There are no recognized analyses of the oscillations of modern
operating synchronous generators exposed to new conditions in power systems. The basic idea is to
perform a numerical analysis of local oscillations of a large number of synchronous generators in
the power system. The paper represents the local mode data obtained from a systematic analysis of
synchronous generators in the Slovenian power system. Analyzed were 74 synchronous generators
of the Slovenian power system, plus many additional synchronous generators for which data were
accessible in references. The mathematical models convenient for the study of local oscillations
are described first in the paper. Next, the influences of transmission lines, size of the synchronous
generators, operating conditions, and control systems were investigated. The paper’s merit is the
applicable rules that have been defined to help power plant operators avoid stability-problematic
situations. Consequently, boundaries were estimated of the eigenvalues of local modes. Finally,
experiments were performed with a laboratory-size synchronous generator to assess the regularity of
the numerically obtained conclusions. The obtained results enable the prediction of local oscillations’
frequencies and dampings and will be useful in PSS planning.
Ključne besede: power system, synchronous generators, oscillations, local modes, eigenvalue analysis
Objavljeno v DKUM: 27.03.2025; Ogledov: 0; Prenosov: 8
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8. Slovenska turistična politika od 1992 do 2018 : magistrsko deloBoštjan Koželj, 2024, magistrsko delo Opis: Tranzicija iz socialističnega v kapitalistično okolje vpliva na številne vidike družbe, vključno s turistično politiko. Na primeru turistične politike se odražajo spremembe v ekonomskem sistemu, družbeni strukturi in političnem okolju. Socializem je pogosto pomenil močno centralizirano upravljanje, medtem ko kapitalizem prinaša večjo vlogo tržnih sil. V turistični politiki to lahko pomeni prehod od centralnega planiranja do večje vključenosti zasebnega sektorja. V obdobju med letoma 1992 in 2018 se je turistična politika Slovenije oblikovala pod vplivom številnih dejavnikov. Deležniki v procesu oblikovanja politik so zajemali vladne organizacije, lokalne skupnosti, podjetnike, nevladne organizacije in druge. Pomembno je razumeti, kako so se njihova stališča odražala v konkretnih politikah. Na turistično industrijo so politični akterji vplivali preko stališč, ki so se odražala v odločitvah glede turistične politike. Analiza političnih strank preko programov in koalicijskih sporazumov omogoča vpogled v to, kako so različni politični dejavniki oblikovali turistično politiko v določenem obdobju. Vprašanja, ki so zaznamovala razvoj turistične politike, so se nanašala na trajnostni razvoj, promocijo turizma, infrastrukturne naložbe, varstvo okolja, upravljanje z naravnimi viri in drugo. Delo zato zajema pregled celotne turistične politike, ki presega (zgolj) zakonodajni vidik. V delu se obravnava tranzicijo turistične politike iz socialistične v kapitalistično ter oblikovanje le-te v obdobju med letoma 1992 in 2018, pri čemer se osredotoča na deležnike, politične akterje, stališča, vključenost političnih strank in ključna vprašanja.
Ključne besede: turistična politika, vloga vlad v turizmu, trajnostni turizem, deležniki v turizmu, javna politika
Objavljeno v DKUM: 26.03.2025; Ogledov: 0; Prenosov: 4
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9. Noise evaluation of S-polymer gearsBoštjan Trobentar, Matija Hriberšek, Simon Kulovec, Srečko Glodež, Aleš Belšak, 2022, izvirni znanstveni članek Opis: In this study, an acoustic behaviour of S-polymer gears made of the material combination
POM/PA66 was investigated and compared to the standardised involute gears (E-gears). Basic
evaluating characteristics included noise during operation, which is of particular significance when
noise reduction is expected. The measured signals were analysed in time and frequency domains
and the levels of acoustic activity were compared. The experimental results have shown that the
sound pressure level of both E- and S-polymer gears are proportional to the torque. However, the
comprehensive noise evaluation has shown some advantages of S-polymer gears if compared to the
E-polymer gears. In that respect, S-polymer gears were found more appropriate for noise reduction
of gear drive systems in the case of normal loading and typical drive speed. Future studies in the
operating behaviour of S-polymer gears could also cover noise evaluation using new methods of
sound signal analysis at different temperatures of gears.
Ključne besede: polymers, S-gears, sound, noise analysis
Objavljeno v DKUM: 24.03.2025; Ogledov: 0; Prenosov: 5
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10. Solidification of gelatine hydrogels by using a cryoplatform and its validation through CFD approachesYasir Beeran Potta Thara, Miha Jordan, Timi Gomboc, Blaž Kamenik, Boštjan Vihar, Vanja Kokol, Matej Zadravec, 2022, izvirni znanstveni članek Opis: In this work, we developed a numerical approach based on an experimental platform
to determine the working conditions on a cryoplatform and to predict and evaluate the cryogenic
printing of hydrogels. Although hydrogels have good biocompatibility, their material properties
make it difficult to print them with high precision and shape fidelity. To overcome these problems, a
cryogenic cooling platform was introduced to accelerate the physical stabilisation of each deposited
layer during the printing process. By precisely controlling solidification (crystallisation), each printed
material can withstand its own weight to maintain shape fidelity, and the porosity of the scaffolds
can also be controlled more selectively. The thermophysical properties of gelatine hydrogels were
investigated to gain a better understanding of the phase change upon freezing. The corresponding
material properties and experimental observations of gelatine solidification served as the basis for
developing a computational fluid model (CFD) to mimic the solidification of gelatine hydrogels
using a cryoplatform at different process conditions and extruder speeds. The goal was to develop a
tool simple enough to predict acceptable process conditions for printing gelatine hydrogels using
a cryoplatform.
Ključne besede: gelatine, hydrogel, cryoprinting, CFD simulation, solidification modelling
Objavljeno v DKUM: 20.03.2025; Ogledov: 0; Prenosov: 7
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