1. Controllability and small-signal oscillations of magnetic flux linkages in doubly fed induction machinesBoštjan Polajžer, Annette Muetze, Seyed Ali Seyed-Bouzari, Jožef Ritonja, 2025, izvirni znanstveni članek Opis: This paper examines the controllability of the stator and rotor magnetic flux linkages of doubly fed induction machines (DFIMs), considering small-signal oscillations and their relationship with electromagnetic machine design. To this aim, we first analyze 66 sets of lumped parameters from the dynamic model of a DFIM. Based on this, we classify DFIMs into three categories based on their modal parameters, namely, two for wind applications and one for pumped-hydro applications. Additionally, we identify reciprocal relationships between the damping of both identified oscillatory modes and the largest eigenvalues of the stator and rotor controllability Gramian matrices. Among the different lumped parameters, the winding resistances are found to influence these relationships the most. All analyzed DFIMs for wind applications were found to be less controllable and to exhibit better damping of oscillatory modes than DFIMs for pumped-hydro applications. Furthermore, based on the results of the controllability analysis, we selected three objective function candidates suitable for an optimization procedure aimed at minimizing the energy required to control the rotor flux linkages. An example objective function was evaluated in a multi-objective DFIM design process for wind applications that enables the design of more controllable machines that provide the desired damping of oscillations, which can consequently contribute to improving grid resilience.
Ključne besede: contorollability, design optimization, doubly fied indusction generators, modal analysis
Objavljeno v DKUM: 14.01.2026; Ogledov: 0; Prenosov: 0
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3. Prednosti in slabosti dvotirnega zapisovanja govora v slovenskih govornih virihDarinka Verdonik, Mitja Trojar, Andreja Bizjak, 2024, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Opis: Zapisovanje govora v govornih korpusih je nedvomno časovno
največji vložek v procesu izdelave govornega korpusa in
pomemben razlog, da so govorni korpusi neprimerno manjši od
pisnih. Zapis govora je prevod iz izvorno večmodalnega kanala
komunikacije, v katerem verbalno izraženi pomen sooblikujejo
glas in način govora, govorica telesa in situacija, v kateri poteka
komunikacija, v eno, pisno modalnost. Zaradi variabilnosti govora
na vseh jezikovnih ravneh se zapisovalec pri tem nenehno sooča
z vprašanjem, kako naj to, kar sliši, zapiše. Da bi bil zapis čim bolj
verodostojen, hkrati pa časovno vseeno izvedljiv za velik obseg
gradiv, se je tako poleg standardiziranega zapisa vzpostavil tudi
tako imenovani pogovorni zapis, ki sledi načelu zapiši, kakor je
izgovorjeno. Toda dvojni zapis zahteva dodaten trud, zato v tem
prispevku kritično prevprašujemo njegovo utemeljenost glede na
prakse drugod, zahtevan dodaten trud in njegove prednosti ter
kritično analiziramo še druga težavnejša vprašanja zapisovanja.
Ključne besede: transkribiranje, standardizirani zapisi, ortografska transkripcija, pogovorni zapisi, fonetična transkripcija
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4. Optimization of an IPMSM for constant-angle square-wave control of a BLDC driveMitja Garmut, Simon Steentjes, Martin Petrun, 2024, izvirni znanstveni članek Opis: Interior permanent magnet synchronous machines (IPMSMs) driven with a square-wave
control (i.e., six-step, block, or 120◦ control), known commonly as brushless direct current (BLDC)
drives, are used widely due to their high power density and control simplicity. The advance firing
(AF) angle is employed to achieve improved operation characteristics of the drive. The AF angle is,
in general, applied to compensate for the commutation effects. In the case of an IPMSM, the AF angle
can also be adjusted to exploit reluctance torque. In this paper, a detailed study was performed to
understand its effect on the drive’s performance in regard to reluctance torque. Furthermore, a multiobjective optimization of the machine’s cross-section using neural network models was conducted to
enhance performance at a constant AF angle. The reference and improved machine designs were
evaluated in a system-level simulation, where the impact was considered of the commutation of
currents. A significant improvement in the machine performance was achieved after optimizing the
geometry and implementing a fixed AF angle of 10◦.
Ključne besede: MTPA, maximum torque per ampere, IPM SM, interior permanent magnet synchronous machine, BLDC, brushless direct current drive, rotor optimization, square-wave control, advance firing angle, neural network
Objavljeno v DKUM: 13.01.2026; Ogledov: 0; Prenosov: 1
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5. High-level process modeling—an experimental investigation of the cognitive effectiveness of process landscape diagramsGregor Polančič, Katja Kous, 2024, izvirni znanstveni članek Opis: Unlike business process diagrams, where ISO/IEC 19510 (BPMN 2.0) prevails, high-level process landscape diagrams are being designed using a variety of standard- or semi-standard-based notations. Consequently, landscape diagrams differ among organizations, domains, and modeling tools. As (process landscape) diagrams need to be understandable in order to communicate effectively and thus form the basis for valid business decisions, this study aims to empirically validate the cognitive effectiveness of common landscape designs, including those BPMN-L-based, which represent a standardized extension of BPMN 2.0 specifically aimed at landscape modeling. Empirical research with 298 participants was conducted in which cognitive effectiveness was investigated by observing the speed, ease, accuracy, and efficiency of answering questions related to semantically equivalent process landscape diagrams modeled in three different notations: value chains, ArchiMate, and BPMN-L. The results demonstrate that BPMN-L-based diagrams performed better than value chain- and ArchiMate-based diagrams concerning speed, accuracy, and efficiency; however, subjects perceived BPMN-L-based diagrams as being less easy to use when compared to their counterparts. The results indicate that differences in cognitive effectiveness measures may result from the design principles of the underlying notations, specifically the complexity of the visual vocabulary and semiotic clarity, which states that modeling concepts should have unique visualizations.
Ključne besede: process modeling, process landscapes, BPMN, cognitive effectiveness
Objavljeno v DKUM: 13.01.2026; Ogledov: 0; Prenosov: 0
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6. Two-phase optimization of binary sequences with low peak sidelobe level valueBorko Bošković, Janez Brest, 2024, izvirni znanstveni članek Opis: The search for binary sequences with low peak sidelobe level value represents a formidable computational problem. To locate better sequences for this problem, we designed a stochastic algorithm that uses two fitness functions. In these fitness functions, the value of the autocorrelation function has a different impact on the final fitness value. It is defined with the value of the exponent over the autocorrelation function values. Each function is used in the corresponding optimization phase, and the optimization process switches between these two phases until the stopping condition is satisfied. The proposed algorithm was implemented using the compute unified device architecture and therefore allowed us to exploit the computational power of graphics processing units. This algorithm was tested on sequences with lengths � = 2� − 1, for 14 ≤ � ≤ 20. From the obtained results it is evident that the two-phase optimization improved the efficiency of the algorithm significantly, the solver speed is increased significantly by using graphics processing units, new-best known solutions were achieved, and the achieved peak sidelobe level values were significantly less than √ �.
Ključne besede: binary sequences, peak sidelobe level, two-phase optimization, parallel processing
Objavljeno v DKUM: 13.01.2026; Ogledov: 0; Prenosov: 0
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8. Practical approaches to the control of milk fermentation with kefir grainsJožef Ritonja, Andreja Goršek, Darja Pečar, Darius Andriukaitis, Boštjan Polajžer, 2024, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Opis: In the chapter, milk fermentation for kefir production is studied. The traditional
kefir production process based on inoculating kefir grains into milk is considered. The
quality and quantity of the produced kefir also depend on the dynamics of the fermentation process. The chapter presents the design and synthesis of the closed-loop
control system in which changing the bioreactor’s temperature is used to control the
time course of the concentration of dissolved CO2. In the chapter: (1) a nonlinear
dynamic mathematical model of the fermentation process, which allows evaluating
the influence of the bioreactor’s temperature on the dynamics of the fermentation
process, is presented; (2) the design and synthesis of a conventional linear control
system with constant parameters are carried out; (3) an adaptive control system that
enables the tracking of the courses of the quantities of the fermentation process to the
desired reference trajectories without the time-consuming preliminary identification
of the parameters of the fermentation process model is developed. The numerical,
experimental, and analytic outcomes of the study are presented.
Ključne besede: milk fermentation, batch biorector, mathematical modeling, control system design and synthesis, linear control, model reference adaptive control
Objavljeno v DKUM: 08.01.2026; Ogledov: 0; Prenosov: 2
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9. Multimodal observable cues in mood, anxiety, and borderline personality disorders: a review of reviews to inform explainable AI in mental healthGrega Močnik, Ana Rehberger, Žan Smogavc, Izidor Mlakar, Urška Smrke, Sara Močnik, 2025, pregledni znanstveni članek Opis: Mental health disorders, such as depression, anxiety, and borderline personality disorder (BPD), are common, often begin early, and can cause profound impairment. Traditional assessments rely heavily on subjective reports and clinical observation, which can be inconsistent and biased. Recent advances in AI offer a promising complement by analyzing objective, observable cues from speech, language, facial expressions, physiological signals, and digital behavior. Explainable AI ensures these patterns remain interpretable and clinically meaningful. A synthesis of 24 recent systematic and scoping reviews shows that depression is linked to self-focused negative language, slowed and monotonous speech, reduced facial expressivity, disrupted sleep and activity, and altered phone or online behavior. Anxiety disorders present with negative language bias, monotone speech with pauses, physiological hyperarousal, and avoidance-related behaviors. BPD exhibits more complex patterns, including impersonal or externally focused language, speech dysregulation, paradoxical facial expressions, autonomic dysregulation, and socially ambivalent behaviors. Some cues, like reduced heart rate variability and flattened speech, appear across conditions, suggesting shared transdiagnostic mechanisms, while BPD’s interpersonal and emotional ambivalence stands out. These findings highlight the potential of observable, digitally measurable cues to complement traditional assessments, enabling earlier detection, ongoing monitoring, and more personalized interventions in psychiatry.
Ključne besede: observable cues, mood disorders, anxiety disorders, borderline personality disorder, multimodal signals, facial expressions, speech patterns, physiological signals, explainable AI, mental health assessment
Objavljeno v DKUM: 05.01.2026; Ogledov: 0; Prenosov: 1
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10. Paletizacija z robotsko roko Kuka KR 70 R2100 v podjetju Inel d.o.o.Žanil Kukovič, 2025, diplomsko delo Opis: V diplomskem delu je predstavljena paletizacija škatel z uporabo industrijske robotske roke Kuka KR70 R2100. Namen diplomske naloge je prikazati učinkovito, zanesljivo in prilagodljivo rešitev za problem avtomatiziranja paletizacije različnih vrst perforiranih škatel. Diplomsko delo zavzema predstavitev robotske celice v kateri obratuje robot, podroben opis prijemala, zagon robota, komunikacijo med robotom in programirljivim logičnim krmilnikom ,varnost v robotski celici, simulacijo robota v simulacijskem programu Kuka.Sim in robotski program. Rezultati pokažejo uspešno in varno paletizacijo, ki izpolnjuje vse zahteve projekta.
Ključne besede: paletizacija, robot, robotska celica, robotski program, varnost
Objavljeno v DKUM: 23.12.2025; Ogledov: 0; Prenosov: 0 |
