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Original Research Confounding associations between green space and outdoor artificial light at night: Systematic investigations and implications for urban health

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Environmental Science and Ecotechnology 2024年第5期 341-349页

作者： Yang Liu Mei-Po Kwan Jianying Wang Jiannan Cai Department of Geography and Resource Management The Chinese University of Hong KongHong KongChina Institute of Space and Earth Information Science The Chinese University of Hong KongHong KongChina Institute of Future Cities The Chinese University of Hong KongHong KongChina

Excessive urbanization leads to considerable nature deficiency and abundant artificial infrastructure in urban areas,which triggered intensive discussions on people's exposure to green space and outdoor artificial light at night(ALAN).Recent academic progress highlights that people's exposure to green space and outdoor ALAN may be confounders of each other but lacks systematic *** study investigates the associations between people's exposure to green space and outdoor ALAN by adopting the three most used research paradigms:population-level residence-based,individual-level residencebased,and individual-level mobility-oriented *** employed the green space and outdoor ALAN data of 291 Tertiary Planning Units in Hong Kong for population-level *** also used data from 940 participants in six representative communities for individual-level *** Kong green space and outdoor ALAN were derived from high-resolution remote sensing *** total exposures were derived using the spatiotemporally weighted *** results confirm that the negative associations between people's exposure to green space and outdoor ALAN are universal across different research paradigms,spatially non-stationary,and consistent among different socio-demographic *** also observed that mobility-oriented measures may lead to stronger negative associations than residence-based measures by mitigating the contextual errors of residence-based *** results highlight the potential confounding associations between people's exposure to green space and outdoor ALAN,and we strongly recommend relevant studies to consider both of them in modeling people's health outcomes,especially for those health outcomes impacted by the co-exposure to them.

关键词： Green space Outdoor ALAN Co-exposure Confounding Mobility spatial non-stationarity

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Towards Near-Field Communications for 6G:Challenges and Opportunities

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ZTE Communications 2024年第1期22卷 3-15页

作者： LIU Mengyu ZHANG Yang JIN Yasheng ZHI Kangda PAN Cunhua Southeast University Nanjing 210096China Queen Mary University of London London E14NSUK

Extremely large-scale multiple-input multiple-output(XL-MIMO)and terahertz(THz)communications are pivotal candidate technologies for supporting the development of 6G mobile ***,these techniques invalidate the common assumptions of far-field plane waves and introduce many new *** accurately understand the performance of these new techniques,spherical wave modeling of near-field communications needs to be applied for future ***,the investigation of near-field communication holds significant importance for the advancement of 6G,which brings many new and open research challenges in contrast to conventional far-field *** this paper,we first formulate a general model of the near-field channel and discuss the influence of spatial nonstationary properties on the near-field channel ***,we discuss the challenges encountered in the near field in terms of beam training,localization,and transmission scheme design,***,we point out some promising research directions for near-field communications.

关键词： near-field communications extremely large-scale antenna arrays spatial non-stationarity beam training localization

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Performance analysis and low complexity receiver design for extra-large scale MIMO systems with residual hardware impairments

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The Journal of China Universities of Posts and Telecommunications 2023年第2期30卷 18-25,35页

作者： Lu Chang Fang Yuan Qiu Ling Liang Xiaowen School of Information Science and Technology University of Science and Technology of ChinaHefei 230026China Key Laboratory of Wireless-Optical Communications Chinese Academy of SciencesHefei 230026China Future Network of the Intelligence Institute and School of Science and Engineering The Chinese University of Hong KongShenzhenShenzhen 518172China

The research purpose of this paper is focused on investigating the performance of extra-large scale massive multiple-input multiple-output(XL-MIMO)systems with residual hardware *** closed-form expression of the achievable rate under the match filter(MF)receiving strategy was derived and the influence of spatial non-stationarity and residual hardware impairments on the system performance was *** order to maximize the signal-to-interference-plus-noise ratio(SINR)of the systems in the presence of hardware impairments,a hardware impairments-aware minimum mean squared error(HIA-MMSE)receiver was ***,the stair Neumann series approximation was used to reduce the computational complexity of the HIA-MMSE receiver,which can avoid matrix *** results demonstrate the tightness of the derived analytical expressions and the effectiveness of the low complexity HIA-MMSE(LC-HIA-MMSE)receiver.

关键词： extra-large scale massive multiple-input multiple-output(XL-MIMO) hardware impairments spatial non-stationarity linear receiver stair Neumann series

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