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Dual ultra-wideband(UWB)radar-based sleep posture recognition system:Towards ubiquitous sleep monitoring

再生工程(英文) 2023年第1期4卷 36-43页

作者： Derek Ka-Hei Lai Li-Wen Zha tommy yau-nam leung Andy Yiu-Chau Tam Bryan Pak-Hei So Hyo-Jung Lim Daphne Sze Ki Cheung Duo Wai-Chi Wong James Chung-Wai Cheung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Bioengineering Imperial CollegeLondon SW72AZUnited Kingdom Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina

Sleep posture monitoring is an essential assessment for obstructive sleep apnea(OSA)*** objective of this study is to develop a machine learning-based sleep posture recognition system using a dual ultra-wideband radar *** collected radiofrequency data from two radars positioned over and at the side of the bed for 16 patients performing four sleep postures(supine,left and right lateral,and prone).We proposed and evaluated deep learning approaches that streamlined feature extraction and classification,and the traditional machine learning approaches that involved different combinations of feature extractors and *** results showed that the dual radar system performed better than either single *** statistical features with random forest classifier yielded the best accuracy(0.887),which could be further improved via an ablation study(0.938).Deep learning approach using transformer yielded accuracy of 0.713.

关键词： Obstructive sleep apnea Deep learning Sleep monitoring Feature extraction Ablation study

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Corrigendum to‘Dual ultra-wideband(UWB)radar-based sleep posture recognition system:Towards ubiquitous sleep monitoring’[Engineered Regeneration 4(2023)36-43]

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再生工程(英文) 2023年第2期4卷 223-223页

作者： Derek Ka-Hei Lai Li-Wen Zha tommy yau-nam leung Andy Yiu-Chau Tam Bryan Pak-Hei So Hyo Jung Lim Daphne Sze Ki Cheung Duo Wai-Chi Wong James Chung-Wai Cheung Department of Biomedical Engineering Faculty of EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Department of Bioengineering Imperial CollegeLondon SW72AZUnited Kingdom Research Institute of Smart Ageing The Hong Kong Polytechnic UniversityHong KongChina School of Nursing The Hong Kong Polytechnic UniversityHong KongChina

The authors regret that the name of the ethic committee that approved the study and the reference number was omitted from the published *** this research,all participants signed an informed consent after receiving an oral and written description of the experiment before the start of the *** study was approved by the Human Subjects Ethics HSEARS20210127007.

关键词： Engine wideband UWB

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What do we know about housing supply?The case of Hong Kong SAR

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Economic and Political Studies 2020年第1期8卷 6-20页

作者： Charles Ka Yui leung Joe Cho Yiu Ng Edward Chi Ho Tang Department of Economics and Finance City University of Hong KongHong Kong SARChina Department of Economics and Finance Hong Kong Shue Yan UniversityHong Kong SARChina

The house price in the Hong Kong SAR of China is well-known to be‘unaffordable’.This paper relates the macroeconomy with the housing market of Hong Kong and argues that the housing supply plays a vital role in explaining the *** paper also shows that there are some practical challenges in understanding the housing supply of Hong Kong,including the potentially complicated ownership structure of real estate *** the discussion centres on the situation of Hong Kong,its lesson may also apply to housing markets in other small open economies.

关键词： New housing supply oligopolistic market structure ownership structure real estate development real estate developers

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