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1.
A case study on the design and implementation of a platform for hand rehabilitation
Tomaž Kosar, Lu Zhenli, Marjan Mernik, Marjan Horvat, Matej Črepinšek, 2021, izvirni znanstveni članek

Opis: Rehabilitation aids help people with temporal or permanent disabilities during the rehabilitation process. However, these solutions are usually expensive and, consequently, inaccessible outside of professional medical institutions. Rapid advances in software development, Internet of Things (IoT), robotics, and additive manufacturing open up a way to affordable rehabilitation solutions, even to the general population. Imagine a rehabilitation aid constructed from accessible software and hardware with local production. Many obstacles exist to using such technology, starting with the development of unified software for custom-made devices. In this paper, we address open issues in designing rehabilitation aids by proposing an extensive rehabilitation platform. To demonstrate our concept, we developed a unique platform, RehabHand. The main idea is to use domain-specific language and code generation techniques to enable loosely coupled software and hardware solutions. The main advantage of such separation is support for modular and a higher abstraction level by enabling therapists to write rehabilitation exercises in natural, domain-specific terminology and share them with patients. The same platform provides a hardware-independent part that facilitates the integration of new rehabilitation devices. Experience in implementing RehabHand with three different rehabilitation devices confirms that such rehabilitation technology can be developed, and shows that implementing a hardware-independent rehabilitation platform might not be as challenging as expected.
Ključne besede: movement observation, rehabilitation aid, assistive technology, robot-assisted rehabilitation, additive manufacturing, local production, human-computer interaction, code generation, domain-specific languages
Objavljeno v DKUM: 16.06.2025; Ogledov: 0; Prenosov: 1
.pdf Celotno besedilo (2,18 MB)
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2.
Power-based concept for current injection by inverter-interfaced distributed generations during transmission-network faults
Boštjan Polajžer, Bojan Grčar, Jernej Černelič, Jožef Ritonja, 2021, izvirni znanstveni članek

Opis: This paper analyzes the influence of inverter-interfaced distributed generations’ (IIDGs) response during transmission network faults. The simplest and safest solution is to switch IIDGs off during network faults without impacting the network voltages. A more elaborate and efficient concept, required by national grid codes, is based on controlling the IIDGs’ currents, involving positive- and negative-sequence voltage measured at the connection point. In this way the magnitude and phase of the injected currents can be adjusted, although the generated power will depend on the actual line voltages at the connection point. Therefore, an improved concept is proposed to adjust IIDGs’ fault current injection through the required active and reactive power, employing the same voltage characteristics. The proposed, i.e., power-based concept, is more definite than the currentbased one, since the required power will always be generated. The discussed concepts for the fault current injection by IIDGs were tested in different 110-kV networks with loop and radial topologies, and for different short-circuit capabilities of the aggregated network supply. Based on extensive numerical calculations, the power-based concept during transmission networks faults generates more reactive power compared to the current-based concept. However, the voltage support by IIDGs during transmission networks faults, regardless of the concept being used, is influenced mainly by the short-circuit capability of the aggregated network supply. As regards distance protection operation, it is influenced additionally by the network topology, i.e., in radial network topology, the remote relay’s operation can be delayed due to a largely seen impedance.
Ključne besede: distributed generation, fault current injection, voltage support, distance protection, transmission network faults
Objavljeno v DKUM: 16.06.2025; Ogledov: 0; Prenosov: 2
.pdf Celotno besedilo (1,39 MB)
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3.
Artificial intelligence in employee learning process : insights from Generation Z
Branka Zolak Poljašević, Simona Šarotar Žižek, Ana Marija Gričnik, 2024, izvirni znanstveni članek

Opis: Artificial intelligence, as a field of computer science focused on developing technologies that simulate intelligent behaviours and human cognitive functions, undoubtedly has huge potential to transform all business activities, including the process of employee learning. However, different generations have varying attitudes toward the rapid advancement of technology and the increasing possibilities offered by artificial intelligence. The general purpose of this research is to gain insights into the attitudes of Generation Z regarding the use of AI in the context of the employee learning process. Empirical research was conducted on a sample of 264 respondents from Slovenia and Bosnia and Herzegovina. In addition to descriptive statistics, Cronbach's alpha, Shapiro-Wilk, and Mann-Whitney tests were used to test hypotheses. Generally, the research findings indicate that the upcoming generation of the workforce considers artificial intelligence a significant factor in improving the employee learning process. The study contributes to human resource management literature because it brings new insights into Generation Z attitudes, whose participation in the active workforce will significantly increase in the coming years.
Ključne besede: learning process, Artificial Intelligence, employees, generation Z, sociodemographic characteristic
Objavljeno v DKUM: 27.05.2025; Ogledov: 0; Prenosov: 4
.pdf Celotno besedilo (561,58 KB)
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4.
Leveraging grammarware for active video game development
Matej Črepinšek, Tomaž Kosar, Matej Moravec, Miha Ravber, Marjan Mernik, 2025, izvirni znanstveni članek

Opis: This paper presents a grammarware-based approach to developing active video games (AVGs) for sensor-driven training systems. The GCGame domain-specific language (DSL) is introduced to define game logic, sensor interactions, and timing behavior formally. This approach ensures cross-platform consistency, supports real-time configurability, and simplifies the integration of optimization and visualization tools. The presented system, called GCBLE, serves as a case study, demonstrating how grammarware enhances modularity, maintainability, and adaptability in real-world physical interaction applications. The results highlight the potential of a DSL-driven design to bridge the gap between developers and domain experts in embedded interactive systems
Ključne besede: active video games, grammarware, internet of things, DSL, procedural level generation, evolutionary computation, game controllers
Objavljeno v DKUM: 23.04.2025; Ogledov: 0; Prenosov: 4
.pdf Celotno besedilo (4,32 MB)

5.
Maximizing the power output and net present value of organic rankine cycle: application to aluminium industry
Monika Dokl, Rok Gomilšek, Lidija Čuček, Ben Abikoye, Zdravko Kravanja, 2022, izvirni znanstveni članek

Opis: This study presents an integrated design and optimization of an Organic Rankine Cycle (ORC) for the recovery of waste heat from aluminium production. Non-Linear Programming (NLP) models were developed, with the objectives of maximizing electricity production and the Net Present Value (NPV) of the system. The models account for optimizing the operating conditions and changes in thermodynamic features of the system. The developed models are applied to a case study of Slovenian aluminium company where the performance of three different working fluids (R245fa, R1234yf and R1234ze) are compared. The optimization is performed considering different temperatures and prices of produced hot water and electricity, minimum approach temperature (DTmin), concentration of CO2 in flue gas and temperature and flowrate of flue gas. Results show that the selected working fluids for the proposed waste heat-based ORC system have the potential to substitute up to about 830 kW of electricity in a sustainable and economic manner. Out of the three working fluids considered, R245fa showed up to 7.9% efficiency of the ORC cycle and was identified as the best performing working fluid considering both economic viability and the amount of electricity produced by the system, however the refrigerant inherently has higher GHG footprint.
Ključne besede: waste heat, waste heat utilization, aluminium industry, organic rankine cycle, power generation, optimization
Objavljeno v DKUM: 10.04.2025; Ogledov: 0; Prenosov: 3
.pdf Celotno besedilo (2,73 MB)
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6.
Enhanced photothermal based-heat retention in regenerated cellulose fibers via ceramic particles and polyelectrolyte binders-based surface functionalization
Özkan Yapar, Ajra Hadela, Alenka Ojstršek, Aleksandra Lobnik, 2025, izvirni znanstveni članek

Opis: : There has been growing interest and increasing attention in the field of functional clothing textiles, particularly in product and process development, as well as innovations in heat-generating, retaining, and releasing fibers to maintain a healthy body temperature without relying on unsustainable energy sources. This study, for the first time, reports the various physio-mechanical properties of surface-functionalized regenerated cellulose fibers (RCFs) coated with ceramic particles. The coating imparts photothermal conversion-based heat generation and retention properties with the aid of polyelectrolyte binders. In this design, ZrC enables the conversion of light energy into thermal energy, providing heat for the human body. A feasible coating process was employed, utilizing industrially feasible exhaustion methods to deposit the ZrC particles onto the RCF surface in conjunction with two distinctive polymeric binders, specifically polyethyleneimine (PEI) and polydiallyldimethylammonium chloride (polyDADMAC). The morphological characteristics and tensile properties of the coated RCFs were analyzed via scanning electron microscopy (SEM) and single-fiber tensile testing. Heat retention and release behaviors of a bundle of fiber samples were assessed using infrared (IR) imaging and an IR emission lamp setup. The SEM results confirmed the successful coating of the ZrC particles on the surface of the RCF samples, influencing negligible on their physical–mechanical properties. The heat retention of the coated RCFs with ZrC and both binders was higher than that of reference regenerated cellulose fibers (RCFs), demonstrating their effective heat generation, retention, and heat release properties. Based on the highlighted prominent results for the coated RCFs, these findings highlight the suitability of the developed functional clothing textiles for targeted applications in non-extreme thermal conditions, ensuring thermo-physiological comfort by maintaining body temperature within a tolerable thermal range (36.5–37.5 ◦C), in contrast to studies reporting significantly higher temperatures (50–78 ◦C) for extreme thermal conditions.
Ključne besede: regenerated cellulose fibers, RCFs, ceramic particles, zirconium carbide, ZrC, surface functionalization, heat generation and retention
Objavljeno v DKUM: 01.04.2025; Ogledov: 0; Prenosov: 131
.pdf Celotno besedilo (9,11 MB)
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8.
Simulating and verifying a 2D/3D laser line sensor measurement algorithm on CAD models and real objects
Rok Belšak, Janez Gotlih, Timi Karner, 2024, izvirni znanstveni članek

Opis: The increasing adoption of 2D/3D laser line sensors in industrial and research applications necessitates accurate and efficient simulation tools for tasks such as surface inspection, dimensional verification, and quality control. This paper presents a novel algorithm developed in MATLAB for simulating the measurements of any 2D/3D laser line sensor on STL CAD models. The algorithm uses a modified fast-ray triangular intersection method, addressing challenges such as overlapping triangles in assembly models and incorporating sensor resolution to ensure realistic simulations. Quantitative analysis shows a significant reduction in computation time, enhancing the practical utility of the algorithm. The simulation results exhibit a mean deviation of 0.42 mm when compared to real-world measurements. Notably, the algorithm effectively handles complex geometric features, such as holes and grooves, and offers flexibility in generating point cloud data in both local and global coordinate systems. This work not only reduces the need for physical prototyping, thereby contributing to sustainability, but also supports AI training by generating accurate synthetic data. Future work should aim to further optimize the simulation speed and explore noise modeling to enhance the realism of simulated measurements.
Ključne besede: 2D/3D laser line sensor, profilometry, simulation, point cloud, measurement generation, STL, Matlab
Objavljeno v DKUM: 10.01.2025; Ogledov: 0; Prenosov: 12
.pdf Celotno besedilo (8,99 MB)
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9.
Generation Z travel values in the luxury tourism industry : 1st cycle professional bachelor's studies graduate thesis
Ema Barišić, 2024, diplomsko delo

Opis: Generation Z is becoming more active in today’s time. Its values are important to investigate as they will be the primary target in the market. In this thesis, we aimed to investigate Generation Z's values in the specific sector of luxury tourism and explore how they would engage with it. To begin, we defined traditional luxury, which was based on material goods, and compared it with new luxury, which is centered around experiences. Afterwards, we collected data on Generation Z from scholars and identified what events could have influenced them to develop such unique values that have not been seen before. To support our claims, we conducted a survey in the empirical part of the thesis. An in-depth analysis was done to examine whether these values hold true or should be reconsidered.
Ključne besede: Generation Z, luxury tourism, new luxury, values
Objavljeno v DKUM: 07.01.2025; Ogledov: 0; Prenosov: 36
.pdf Celotno besedilo (480,55 KB)

10.
Generation Z and ethicality of advancement in the workplace : a study of Slovenia and Lithuania
Zlatko Nedelko, Valentina Peleckiene, Kęstutis Peleckis, Kestutis K. Peleckis, Giedre Lapinskiene, Vojko Potočan, 2022, izvirni znanstveni članek

Opis: The main purpose of this study was to examine the ethicality of future employees’ attitudes toward advancement in the workplace in Slovenia and Lithuania. This study focuses on students representing young adults from Generation Z as future employees in organizations. Using a survey of work-related issues, we collected 212 answers from Slovenian and 159 from Lithuanian' students from business faculties. We used t-tests and regression analyses to obtain results. We found that the future employees in Slovenia see organizationally beneficial behavior and self-indulgent behavior significantly more acceptable for their advancement, than their Lithuanian peers. No differences exist in the perception of destructive behavior among participants from both countries. Substantial differences in the importance of personal values ​​among Generation Z members in both societies, provide a strong support for the divergence nature of Generation Z across cultures. The impact of personal values on the ethicality of different behavior for advancement in the workplace among future employees in both societies is substantial, but biased and follows different patterns. In Slovenia, the dominant role has power, followed by hedonism, benevolence, security, conformity, tradition, and universalism, while in Lithuania, the dominant role belongs to self-direction, followed by tradition, universalism, security, achievement, and power. This study will help us to understand Generation Z values and their perceptions regarding ethicality of advancement in the workplace and enable organizations to manage the behavior of future employees.
Ključne besede: Generation Z, personal values, Slovenia, Lithuania, unethical practices, ethicality, behavior, advancement in the workplace
Objavljeno v DKUM: 11.07.2024; Ogledov: 88; Prenosov: 13
.pdf Celotno besedilo (304,12 KB)
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