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Abstract: V diplomskem delu je predstavljen razvoj kontrolerja MIDI, ki temelji na platformi Arduino. Končni izdelek nudi 36 tipk v matriki 6×6, osvetljenih z diodami LED, ki pošiljajo serijske signale MIDI. Tipični ukazi se izvedejo v manj kot 2 ms, kar je primerljivo z industrijskimi napravami, poraba statičnega pomnilnika pa pri 1,12 kB spada v varno območje pomnilniškega prostora platforme Arduino Nano. Ohišje je izdelano s 3D-tiskanjem, pri čemer so bili za posamezne strukturne in funkcionalne komponente izbrani ustrezni materiali in filamenti. Naprava združuje nizko ceno s funkcionalnostjo, primerljivo z namenskimi komercialnimi kontrolerji. Delo prinaša uporabne vpoglede za Arduino navdušence in glasbenike, ki jih zanima izdelava lastnih naprav MIDI.
Keywords: Arduino, MIDI, glasba
Published in DKUM: 05.11.2025; Views: 0; Downloads: 40
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Abstract: We investigated the agreement and accuracy of manual editing of the high-density electromyogram (hdEMG) decomposition results by seven human operators with various experience levels. All operators edited the same automatically decomposed experimental hdEMG from the first dorsal interosseous (FDI), tibialis anterior (TA), vastus lateralis (VL), and biceps brachii (BB) muscles, and synthetic hdEMG from soleus (SO) and BB muscles at 10%, 30%, 50% and 70% of maximum voluntary contraction. On average, operators kept 13.7 ± 7.4 motor units (MUs) after editing and demonstrated relatively large disagreement in the calculated MU pulse trains (normalized root mean square difference) but relatively high agreement in the identified MU discharges. Inter-operator agreement positively correlated with the initial MU Pulse-to-Noise Ratio used as a quality measure of automatic MU identification, and negatively correlated with the muscle contraction level. Operators agreed more on the results of the simulated than experimental hdEMG. Among the experimental muscles tested, the greatest agreement was demonstrated for VL and the lowest for BB. We obtained similar results when comparing editing to the results of the most experienced operator and to ground truth in simulated cases: the greatest precision and sensitivity were demonstrated for VL, and the lowest for BB. The level of the operator’s experience had a significant impact on the editing of synthetic hdEMG and the detection of the first MU discharge, but not on the rate of agreement or editing time of experimental hdEMG.
Keywords: hdEMG, manual editing, decomposition results, human operators, motor unit, človeški operaterji
Published in DKUM: 14.10.2025; Views: 0; Downloads: 4
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Abstract: Over recent years, a growing body of research has highlighted the neural plastic effects of spinal manipulation on the central nervous system. Recently, it has been shown that spinal manipulation improved outcomes, such as maximum voluntary force and limb joint position sense, reflecting improved sensorimotor integration and processing. This study aimed to further evaluate how spinal manipulation can alter neuromuscular activity. High density electromyography (HD sEMG) signals from the tibialis anterior were recorded and decomposed in order to study motor unit changes in 14 subjects following spinal manipulation or a passive movement control session in a crossover study design. Participants were asked to produce ankle dorsiflexion at two force levels, 5% and 10% of maximum voluntary contraction (MVC), following two different patterns of force production (“ramp” and “ramp and maintain”). A significant decrease in the conduction velocity (p = 0.01) was observed during the “ramp and maintain” condition at 5% MVC after spinal manipulation. A decrease in conduction velocity suggests that spinal manipulation alters motor unit recruitment patterns with an increased recruitment of lower threshold, lower twitch torque motor units.
Keywords: high-density surface electromyography, chiropractic, electromyography decomposition, motor unit
Published in DKUM: 20.06.2025; Views: 0; Downloads: 6
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Published in DKUM: 04.06.2025; Views: 0; Downloads: 0
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Abstract: V sodelovanju z Nuklearno elektrarno Krško smo izvedli nadgradnjo sistema za zapiranje sodov s srednje in nizko radioaktivnimi odpadki. Posodobljena je bila strojna in programska oprema krmilnika. Razvit je bil grafični vmesnik s simulacijo senzorjev in ventilov ter simulacijsko okolje za testiranje in usposabljanje operaterjev. Vzpostavljena je bila povezava s procesno-informacijskim sistemom preko protokola Modbus. Kibernetska varnost je bila izboljšana z uporabo podatkovne diode in platforme Nozomi Networks za zaznavanje groženj. Z nadgradnjo je bila izboljšana zanesljivost, varnost in učinkovitost procesa. Zmanjšana je bila potreba po ročnih posegih v območju sevanja, sistem pa je postal odpornejši na kibernetske napade.
Keywords: krmilnik, vmesnik človek-stroj, kibernetska varnost, podatkovna dioda, simulacija
Published in DKUM: 08.05.2025; Views: 0; Downloads: 24
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