Adelaide Research & Scholarship
Adelaide Research & Scholarship (AR&S) is the University of Adelaide’s digital repository. AR&S provides a platform for the collection, organisation, access and preservation of the research and scholarly outputs of the University community in digital formats, as well as digital management of information in physical formats.
University of Adelaide higher degree by research theses are deposited into the AR&S Theses community as part of the final thesis lodgement process.
AR&S also serves as the home of the digital collections of University Library Archives and Special Collections. Items include digitized representations of physical items, such as photographs and full texts, and digital-born materials, allowing worldwide access to our heritage and research collections.
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Recent Submissions
Switching-Like Event-Based Formation Control for Multi-Agent Systems Against Denial of Service Attacks
(Institute of Electrical and Electronics Engineers, 2025) Ru, T.; Cai, C.; Lin, H.; Rudas, I.; Shi, P.
This article studies formation control for multiagent systems in the presence of denial-of-service (DoS) attacks. The challenge is to address secure formation tracking and communication bandwidth-saving issues simultaneously. To tackle this, we propose a switching-like eventtriggered mechanism that reduces excessive bandwidth consumption during interactions among multiple followers under DoS attacks. The triggering condition is allowed to be switched during the intervals when attacks are activated, ensuring that triggering can normally occur throughout the overall time interval by introducing an auxiliary variable depending on the success of the latest trigger moment. Based on this approach, we construct an event-based timevarying formation control scheme. In addition, we establish sufficient conditions that reveal the relationship between exponential stability and the frequency/duration of the DoS attacks. Unlike other single-leader methods, a significant feature of the formation control scheme is its ability to achieve the desired formation tracking for multiagent systems with multiple leaders. Finally, the validity of the proposed method is demonstrated through simulation and experimental results.
Task-related changes in aperiodic activity are related to visual working memory capacity independent of event-related potentials and alpha oscillations
(The MIT Press, 2025) Virtue-Griffiths, S.; Fornito, A.; Thompson, S.C.H.; Biabani, M.; Tiego, J.; Thapa, T.; Bailey, N.W.; Rogasch, N.C.
Research using electroencephalography (EEG) has shown that individual differences in visual working memory capacity are related to slow-wave event-related potentials (ERPs) and suppression of alpha-band oscillatory power during the delay period of memory tasks. However, recent evidence suggests that changes in non-oscillatory (aperiodic) features of the EEG signal are related to working memory performance. We assessed several features of task-related changes in aperiodic activity including its spatial distribution, the effect of memory load, and the relationships between aperiodic activity, memory capacity, slow-wave ERPs, and alpha suppression. Eighty-four healthy individuals performed a continuous recall working memory (WM) task consisting of 2, 4 or 6 coloured squares while EEG was recorded. Aperiodic activity during a baseline and WM delay period was quantified by fitting a model to the background of the EEG power spectra, which returned parameters describing the slope (exponent) and broadband offset of the spectra. The aperiodic exponent increased (i.e., slope steepened) in fronto-central electrodes during the WM delay period, whereas the offset decreased over parieto-occipital electrodes. These task-related changes in aperiodic activity did not differ between memory loads. Larger increases in the aperiodic exponent were associated with higher working memory capacity measured from both the WM task and a separate battery of complex span tasks, a relationship that was independent of slow-wave ERPs and alpha suppression. Our findings suggest that WM task-related changes in aperiodic activity are region specific and reflect an independent neural mechanism that is important for general working memory ability.
The influence of Australian sea lion foraging on benthic assemblages in temperate marine ecosystems
(Oxford University Press, 2025) Corrales-Guerrero, J.; Goldsworthy, S.D.; Coleman, M.A.; Kelaher, B.P.; Connell, S.D.; Figueira, W.F.; Miller, D.; Gillanders, B.M.; Rodil, I.F.
Robust and thriving populations of marine predators are widely recognized as being essential to enhancing trophic complexity, structure, and biodiversity. While some pinniped populations have shown signs of recovery, many others, including Australian sea lions (Neophoca cinerea), remain at low levels or continue to decline. There is a limited understanding of the relationship between feeding habitat preferences, food web dynamics, and benthic community structure. We examined how foraging density of the endangered Australian sea lion relates to fish and invertebrate assemblage structure. We also assessed how several biophysical conditions influence these patterns across multiple South Australian coastal sites. Our methods revealed positive associations between sea lion foraging density and the abundance of their benthic prey. Depth was the primary factor explaining the variability in foraging density, followed by primary productivity (Chl a). Habitat use appears driven by prey patch characteristics, including depth, productivity, and substrate, suggesting specialized foraging strategies. Our results suggest that sea lion densities are associated with areas of elevated prey availability and local species richness, though it remains unclear whether predators influence community structure or simply select more biodiverse habitats. Long-term monitoring of sea lions and their prey in and around coexisting habitats will help to disentangle trophic interactions linked with sea lion population recovery. Further research is needed to better understand the critical habitats and trophic ecology of sea lions, and their impact on community structure in different habitats. Understanding sea lion foraging ecology and its role in structuring benthic ecosystems can enhance conservation planning by integrating predator–prey dynamics into marine management frameworks.
The prognostic importance of worsening dyspnoea in systemic sclerosis related interstitial lung disease
(Elsevier, 2025) Morrisroe, K.; Hansen, D.; Stevens, W.; Ross, L.; Sahhar, J.; Ngian, G.-S.; Host, L.V.; Proudman, S.; Barron, M.; Nikpour, M.
Objectives: To determine the prognostic importance of worsening dyspnoea in systemic sclerosis (SSc) related interstitial lung disease (ILD). Methods: SSc patients were recruited from the Australian Scleroderma Cohort Study. ILD was defined as present if characteristic fibrotic changes on high-resolution computer tomography (HRCT) scan lung were seen, performed based on clinical suspicion. Determinants of survival in SSc-ILD were analysed, specifically the prognostic impact of ILD progression, defined according to the ATS, INBUILD and spirometric definitions of progressive pulmonary fibrosis, and the presence of worsening dyspnoea using accelerated failure time survival analysis. Results: In our cohort of 2198 SSc patients, 17.7% (n = 389) developed incident ILD over a median (IQR) followup period of 5.8 (2.8–9.9) years. A third of our incident ILD cohort (38.3%, n = 149) experienced progressive ILD. In those who experienced progressive ILD, mortality was significantly higher in those who reported recent worsening dyspnoea in the prior month irrespective of a decline in spirometric parameters. Conclusion: 38.8% of those with incident ILD experienced ILD progression over follow-up. Patient-reported worsening dyspnoea in the month prior, irrespective of changes in spirometry, was strongly associated with mortality, with a magnitude equivalent to that of the presence of progressive ILD as defined by the ATS, INBUILD and spirometric definitions of progressive ILD. This study has highlighted the prognostic importance of patientreported symptoms in the evaluation of SSc-ILD.
The road less taken: Dihydroflavonol 4-reductase inactivation and delphinidin anthocyanin loss underpins a natural intraspecific flower colour variation
(Wiley, 2025) Wong, D.C.J.; Wang, Z.; Perkins, J.; Jin, X.; Marsh, G.E.; John, E.G.; Peakall, R.
Visual cues are of critical importance for the attraction of animal pollinators, however, little is known about the molecular mechanisms underpinning intraspecific floral colour variation. Here, we combined comparative spectral analysis, targeted metabolite profiling, multi-tissue transcriptomics, differential gene expression, sequence analysis and functional analysis to investigate a bee-pollinated orchid species, Glossodia major with common purple-and infrequent white-flowered morphs. We found uncommon and previously unreported delphinidin-based anthocyanins responsible for the conspicuous and pollinator-perceivable colour of the purple morph and three genetic changes underpinning the loss of colour in the white morph – (1) a loss-of- function (LOF; frameshift) mutation affecting dihydroflavonol 4-reductase (DFR1) coding sequence due to a unique 4-bp insertion, (2) specific downregulation of functional DFR1 expression and (3) the unexpected discovery of chimeric Gypsy transposable element (TE)-gene (DFR) transcripts with potential consequences to the genomic stability and post-transcriptional or epigenetic regulation of DFR. This is one of few known cases where regulatory changes and LOF mutation in an anthocyanin structural gene, rather than transcription factors, are important. Furthermore, if TEs prove to be a frequent source of mutation, the interplay between environmental stress-induced TE evolution and pollinator-mediated selection for adaptive colour variation may be an overlooked mechanism maintaining floral colour polymorphism in nature.