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However, existing HAR methods face significant challenges due to the variability in home layouts, sensor types, and activity labels across different datasets, which limits their generalization and scalability. Most approaches require extensive customization, making cross-environment HAR implementation challenging in real-world scenarios. To address these challenges, we propose a unified HAR framework that introduces Functional Areas, which abstract physical spaces into standardized activity zones, and Detector Units, which map heterogeneous sensor configurations into a common representation. We evaluate our framework using multiple publicly available HAR datasets based on ambient sensor data of smart homes, testing two model architectures: a Holistic Approach, which trains a single GRU-based neural network on the combined datasets, and a Reductionist Approach, which employs an ensemble bagging method. The Holistic Approach demonstrated superior generalisation, achieving 0.84 precision and 0.73 accuracy, outperforming the reductionist approach.<\/jats:p>","DOI":"10.1007\/s40860-025-00255-1","type":"journal-article","created":{"date-parts":[[2025,9,18]],"date-time":"2025-09-18T04:28:49Z","timestamp":1758169729000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A uniform approach to HAR recognition in unobtrusive indoor monitoring systems"],"prefix":"10.1007","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0434-0446","authenticated-orcid":false,"given":"Fabio","family":"Salice","sequence":"first","affiliation":[]},{"given":"Davide","family":"Mangano","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5227-6602","authenticated-orcid":false,"given":"K\u00e9vin","family":"Bouchard","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9554-8815","authenticated-orcid":false,"given":"Sara","family":"Comai","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,9,18]]},"reference":[{"unstructured":"United Nations Department of Economic and Social Affairs: Growing at a Slower Pace: World Population Expected to Reach 9.7 Billion in 2050 and Could Peak at Nearly 11 Billion Around 2100. 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