1. Interference mitigation in one-way channel reconstruction for robust phase-based rangingGrega Morano, Tomaž Javornik, Aleš Simončič, Aleš Švigelj, Andrej Hrovat, 2026, original scientific article Abstract: Under the Integrated Sensing and Communication (ISAC) paradigm, wireless networks are evolving into multifunctional platforms that seamlessly combine data transmission with high-precision ranging for applications such as indoor navigation, asset tracking, and context-aware Internet of Things (IoT). The Multi-Carrier Phase Difference (MCPD) method has emerged as an effective technique for enabling localization in narrowband communication systems by estimating the channel frequency response (CFR) used for distance estimation. Converting the two-way CFR (TWCFR) into a one-way CFR (OWCFR) provides a physically consistent representation of the propagation channel and thus improves the ranging performance. However, existing channel reconstruction (CR) methods rely on noise-sensitive phase unwrapping which degrades in the presence of noise and interference, common in dense IoT deployments and crowded frequency bands. To address these limitations, we propose a noise-resistant OWCFR reconstruction algorithm that utilizes a peak-driven adaptive windowing strategy to generate a reference TWCFR for reliable square-root branch selection and incorporates a delay alignment correction to restore the maximum unambiguous range. Simulation and experimental results using IEEE 802.15.4 time-slotted channel hopping (TSCH) compliant devices demonstrate that the proposed method achieves robust and accurate distance estimation in more than 99.8% of interference scenarios.
Keywords: telecommunications, channel frequency response, channel impulse response, document classification, Bluetooth, localization, IEEE 802.15.4, multi-carrier phase difference, one-way ranging, phase-based ranging, time-slotted channel hopping (TSCH), two-way ranging
Published in DiRROS: 13.01.2026; Views: 27; Downloads: 8
 Full text (2,12 MB)
This document has many files! More... |
2. A practical method to incorporate scour hole shape effects in Winkler-type pile foundation models for bridgesMirko Kosič, Luke J. Prendergast, Andrej Anžlin, 2025, original scientific article Abstract: Scour erosion continues to cause significant issues for the stability and lifespan of bridges worldwide. In Slovenia, extreme flooding in 2023 caused the collapse or failure of many bridges, primarily due to scour, which was exacerbated by debris accumulation. Despite advances in predicting and monitoring scour, it remains among the top reasons for the failure of bridges during flooding. Recent advances in vibration-based health monitoring suggest that scour erosion can be detected using methods such as changes in natural frequency, mode shapes, flexibility-based deflection, and other approaches using offline sensors such as passing vehicle responses. Many of these methods have been trialled numerically where scour is implemented as a reduction in the soil level (or stiffness) around a given bridge foundation. The most common way to model scour is to lower the soil level around a foundation, however, this ignores any contribution that the scour hole shape makes to the stiffness and strength of the soil beneath the scour hole. This paper investigates how the shape of scour holes influences the stiffness and strength of the remaining soil to understand the impact on the modal behaviour of a bridge. A numerical model of a bridge is developed where scour is implemented by removing Winkler springs from the model, and different scour hole shapes are considered in terms of how the remaining overburden influences the stiffness and strength of the soil springs. Scour hole shape properties are considered by means of varying the depth, width, and slope angle of the hole around a given foundation element. For the analyses in this paper, different scour hole shapes are implemented on an example bridge corresponding to local scour holes with narrow width; wider local scour holes; and general scour, where the full soil layer is removed (infinite width). The changes in the modal periods and mode shapes of the bridge in the traffic and river flow directions are assessed to understand the impact of the different scour types on the vibration characteristics.
Keywords: scour, dynamics, overburden, frequency, damage, bridges, scour hole shape
Published in DiRROS: 13.01.2026; Views: 26; Downloads: 8
Full text (10,37 MB)
This document has many files! More... |
3. Frequency-domain analysis of voltammetric signals : a framework to augment electrochemical sensing explored through benzenediol detectionAbhilash Krishnamurthy, Kristina Žagar, 2026, original scientific article Abstract: Electrochemical signals are traditionally interpreted in the time domain, where overlapping faradaic and non-faradaic currents, noise, and drift obscure frequency-dependent behaviour. This study introduces a frequency-domain framework that complements time-domain analysis by decomposing voltammetric signals into their harmonic components through Fourier methods. AC voltammetry provides experimental evidence of how increasing excitation frequency progressively suppresses faradaic clarity, while a modified Randles equivalent circuit model explains this response through the interplay of charge-transfer, diffusion, and double-layer charging processes. Fourier series analysis of canonical voltammetric techniques, including linear sweep, cyclic, differential pulse, and square wave voltammetry, shows that waveform geometry uniquely defines harmonic structure. Fast Fourier transform analysis of practical data reveals artefacts introduced by finite sampling, binning, and spectral leakage. These effects highlight the need for conceptual awareness when interpreting experimental spectra. Quantitative spectral descriptors such as the centroid, bandwidth, flatness, and low-frequency power fraction link waveform design directly to faradaic visibility and measurement clarity. Frequency-domain analysis therefore establishes that electrochemical measurement is inherently frequency-structured. By combining experimental data, equivalent circuit modelling and spectral metrics within a single framework, this approach provides a general route to optimise waveform parameters, reduce capacitive interference, and improve interpretability across electrochemical techniques. Viewed more broadly, this perspective reframes the process of the measurement itself, showing that time-domain signals are projections of an underlying spectral reality.
Keywords: frequency domain, spectral decomposition, electrochemical sensors, benzenediols
Published in DiRROS: 22.12.2025; Views: 213; Downloads: 61
Full text (6,14 MB)
This document has many files! More... |
4. Predatory bug Picromerus bidens communicates at different frequency levelsAndrej Čokl, Alenka Žunič Kosi, Meta Virant-Doberlet, 2011, original scientific article Abstract: The Asopinae (Heteroptera: Pentatomidae) are a subfamily of stinkbugs with predaceous feeding habits and poorly understood communication systems. In this study we recorded vibratory signals emitted by Picromerus bidens L. on a non-resonant substrate and investigated their frequency characteristics. Males and females produced signals by vibration of the abdomen and tremulation. The female and male songs produced by abdominal vibrations showed gender-specific time structure. There were no differences in the temporal patterns of male or female tremulatory signals. The signals produced by abdominal vibrations were emitted below 600 Hz whereas tremulatory signals had frequency ranges extending up to 4 kHz. Spectra of male vibratory signals produced by abdominal vibrations contained different peaks, each of which may be dominant within the same song sequence. Males alternated with each other during production of rivalry signals, using different dominant frequency levels. We show that the vibratory song repertoire of P. bidens is broader than those of other predatory stinkbugs that have been investigated. The emission of vibrational signals with different dominant frequencies but the same production mechanism has not yet been described in heteropteran insects, and may facilitate location of individual sources of vibration within a group.
Keywords: substrate-borne vibrational communication, signal production, signal frequency variation
Published in DiRROS: 12.03.2025; Views: 659; Downloads: 447
Full text (503,23 KB)
This document has many files! More... |
5. Palomena prasina (Hemiptera: Pentatomidae) vibratory signals and their tuning with plant substratesJernej Polajnar, Andreja Kavčič, Alenka Žunič Kosi, Andrej Čokl, 2013, original scientific article Abstract: Palomena prasina is interesting for the study of vibrational communication within the Pentatomid subfamily Pentatominae, because its host range is limited to woody plants, unlike the better known Nezara viridula, whose vibrational communication is commonly used as a model for the whole family. The vibrational repertoire of P. prasina was described several decades ago and is redescribed in this paper using modern methods for non-contact vibration recording. Additionally, we hypothesized that this species has retained the capacity for signal frequency variation necessary for tuning to resonance properties of various host plants of Pentatominae, but if the signals are emited in the absence of mechanical feedback, they are tuned more specifically to their native acoustic environment – woody plants. By recording live bugs signalling on different substrates and comparing spectral properties of their signals among substrates, we found that there is a match between the signals emitted on a woody branch and those emitted on a non-resonant surface, while spectral properties of signals emitted on herbaceous plants differ. Our findings provide evidence in support of the signal tuning hypothesis and shed further light on the crucial role of substrate in vibrational communication of insects.
Keywords: vibrational communication, signal propagation, frequency characteristics
Published in DiRROS: 12.03.2025; Views: 664; Downloads: 455
Full text (767,16 KB)
This document has many files! More... |
6. Frequency of physical activity-related injuries among adolescents : an umbrella reviewKerrtu Toivo, Peter Bakalár, Mari Leppänen, Jari Parkkari, Ensar Abazović, Boštjan Šimunič, Kaja Teraž, Marta Malinowska-Cieślik, Jaroslava Kopčáková, Aurel Zelko, Agnieszka Michalska, Dagmar Sigmundova, Rado Pišot, Armin Paravlić, 2025, review article Abstract: Objectives: The aim of this umbrella review was to investigate the frequency of physical activity-related injuries (PARI) among adolescents. Our secondary objective was to describe the available reviews of injuries in three settings: organized sports, leisure time physical activity (PA), and school physical education (PE). Methods: We conducted an overview of reviews consistent with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement guidelines on the frequency of physical activity related injuries in adolescents. Results: We identified 19 systematic reviews with at least moderate quality to include in the review. We were not able to pool data from reviews and conduct meta-analysis due to heterogeneity of injury definitions, exposure times, and sample demographics. All reviews included studies of injuries sustained in organized sports, and injury incidence was higher during matches than training. No systematic reviews were found focusing on leisure time or school-based PA injuries. Conclusion: High-quality research is essential to understand the frequency of various types of physical activity related injuries among adolescents in organized sports, PE, and leisure time activities to develop more effective prevention strategies.
Keywords: physical activity-related injuries, sports injuries, adolescence, frequency, prevalence, incidence
Published in DiRROS: 22.01.2025; Views: 782; Downloads: 405
Full text (915,45 KB)
This document has many files! More... |
7. Estimating exposure to extremely low frequency magnetic fields near high-voltage power lines and assessment of possible increased cancer risk among Slovenian children and adolescentsTina Žagar, Blaž Valič, Tadej Kotnik, Sara Korat, Sonja Tomšič, Vesna Zadnik, Peter Gajšek, 2023, original scientific article Keywords: exposure assessment, childhood cancer, extremely low frequency magnetic fields, modelling, high voltage power lines
Published in DiRROS: 25.07.2024; Views: 972; Downloads: 1027
Full text (1,84 MB)
This document has many files! More... |
8. The use of high-frequency short bipolar pulses in cisplatin electrochemotherapy in vitroMaria Scuderi, Matej Reberšek, Damijan Miklavčič, Janja Dermol-Černe, 2019, original scientific article Keywords: electroporation, electrochemotherapy, high-frequency bipolar pulses, cisplatin, cell survival, drug uptake
Published in DiRROS: 09.07.2024; Views: 995; Downloads: 573
Full text (405,37 KB)
This document has many files! More... |
