Author

Siôn Parkinson

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Open access Sep 2026

Impacts of Increasing Autonomous Vehicle Penetration on Urban Traffic Performance: A Multi-City Simulation Study

Connected autonomous vehicles (CAVs) will be gradually introduced into road networks, creating mixed-traffic environments where CAVs and human-driven vehicles (HDVs) operate together. Understanding how increasing CAV penetration influences traffic performance is therefore essential. This study evaluates the impact of C...

Christian Wellens-Miles, Siôn Parkinson, Mauro Vallati · Smart Cities · 0 citations

#artificial intelligence Preprint Sep 2026

Caption-Mediated Perceived-Safety Estimation for Pedestrian Routing

This paper presents an explainable approach to pedestrian routing, in which perceived safety is estimated from street-level imagery through an explicit natural-language intermediate representation. A vision--language model caption is generated and stored before any scoring is undertaken, and the perceived-risk class is...

Siôn Parkinson, Paloma Liu, Wei Zheng et al. · 0 citations

#artificial intelligence Preprint Sep 2026

Template Ageing and Longitudinal Verification in Fixed-Text Keystroke Dynamics: A Subject-Disjoint Study Across Eight Weeks

This work compares a scaled-Manhattan matcher, a gradient-boosted classifier, a gradient-boosted classifier, a TypeNet-style recurrent embedding model, and a TypeFormer-style Transformer under a 5-fold subject-disjoint protocol and a design that jointly varies mechanism and the enrolment-to-query gap, and proves large...

Siôn Parkinson, Saad Khan, Na Liu et al. · 0 citations