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  • Item type: Publicação , Access status: Apenas metadados ,
    MoniCrowd: A Real-World WiFi Probe Labelled Dataset with Device-Level Ground Truth
    (2026-09-24) Martins, Miguel; Nunes de Oliveira, João Pedro; Neto Marinheiro, Rui; Brito e Abreu, Fernando
    This dataset, released under the MoniCrowd project, provides a real-world and controlled collection of WiFi probe request traces designed to support research in crowd sensing, device fingerprinting, and privacy-preserving wireless analytics. The dataset combines high-fidelity labelled data collected in a controlled laboratory environment, performed inside a custom-designed Faraday cage to ensure electromagnetic isolation and eliminate external interference, enabling the generation of reliable ground truth at the device level. Each device was individually characterized, with per-device packet capture (PCAP) traces and associated metadata including brand, model, operating system, and operating system version. The dataset is intended to support reproducible research in areas such as crowd monitoring, wireless device fingerprinting, anomaly detection, and machine learning-based identification methods. To the best of our knowledge, this is one of the largest publicly available datasets combining per-device PCAP traces and multi-level device ground truth. The dataset is accompanied by processing scripts and documentation to facilitate reuse and benchmarking by the research community.
  • Item type: Item , Access status: Acesso aberto ,
    Mapping built-environment exposure to night-time road traffic noise in Malta
    (2026) Correia, R. M.; Rocha, J.; Balzan, M. V.
    Strategic noise maps support environmental policy but may obscure how exposure relates to the built environment, socioeconomic conditions and road network structure. This study integrates Malta’s 2021 night-time road traffic noise contours with 142,681 building footprints, local council socioeconomic indicators and a road network derived from a historical OpenStreetMap snapshot. Of the building footprints, 13,773 (9.65%) intersected contours at or above 50 dB, representing 1.92 km2 (6.26%) of the national building-footprint area. Socioeconomic disadvantage showed no strong monotonic relationship with exposure across 68 local councils, although higher noise exposure was concentrated in a subset of disadvantaged localities. At 500 m, the road length in the top centrality decile was associated with the exposed building count (Spearman ? = 0.614) and footprint share (? = 0.604). Priority screening identified 23 cells in 15 clusters where high road centrality coincided with a greater mapped building-footprint area in higher noise classes. The results show how strategic noise mapping can support more targeted environmental action by identifying administrative divisions (local councils) where socioeconomic disadvantage coincides with higher levels of noise exposure and transport corridors where greater building exposure overlaps with structurally important roads.
  • Item type: Item , Access status: Acesso aberto ,
    Proposal for an integrated SIPOC-VSM model: A case study in an automotive after-sales services workshop
    (2026) Botas, D.; Neves, A.; Matos, F.; Godina, R.
    Continuous improvement methodologies, particularly Lean and Six Sigma, have been extensively applied in manufacturing; however, their implementation in the service sector presents significant challenges due to the inherent intangibility, personalization, and variability of service processes. Existing literature offers limited guidance on systematically integrating Lean and Six Sigma tools to address these complexities, particularly in industries such as automotive workshops and automotive insurance, where research remains scarce. This study proposes a structured integration of Value Stream Mapping (VSM) from Lean Management with the Suppliers, Inputs, Processes, Outputs, and Customers (SIPOC) framework from Six Sigma, forming a novel model named Integrated SIPOC-VSM Model (IMSV). While VSM and SIPOC are occasionally combined in industrial settings, no standardized or systematic methodology exists for their integration. IMSV was developed and adapted to the specific context of a collision repair workshop within a collision-avoidance assistance (CAA) service provider, modifying the SIPOC framework by incorporating an adapted VSM within the Process stage. The primary objective of IMSV is to streamline and reorganise activities within the repair process, enhancing efficiency and fostering continuous improvement. The results demonstrate that IMSV effectively redistributed responsibilities among process stakeholders, reduced activities redundancy, and optimized workflow, leading to a 30% reduction in the total number of process activities identified in the workflow. These findings highlight the potential of IMSV to address the operational inefficiencies prevalent in automotive workshops, filling a critical gap in the literature and providing a replicable model for similar applications in the automotive service, insurance sectors and in the service sector overall.