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A review of smartphones-based indoor positioning:Challenges and applications

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IET Cyber-Systems and Robotics 2021年第1期3卷 1-30页

作者： Khuong An Nguyen Zhiyuan Luo Guang Li chris Watkins School of Computing Engineering and MathematicsUniversity of BrightonBrightonUK Computer Science Department Royal HollowayUniversity of LondonEghamUK Institute of Cyber-Systems and Control Zhejiang UniversityHangzhouChina

The continual proliferation of mobile devices has encouraged much effort in using the smartphones for indoor *** article is dedicated to review the most recent and interesting smartphones-based indoor navigation systems,ranging from electromagnetic to inertia to visible light ones,with an emphasis on their unique challenges and potential realworld applications.A taxonomy of smartphone sensors will be introduced,which serves as the basis to categorise different positioning systems for reviewing.A set of criteria to be used for the evaluation purpose will be *** each sensor category,the most recent,interesting,and practical systems will be examined,with detailed discussion on the open research questions for the academics,and the practicality for the potential clients.

关键词： client smart taxonomy

Time to treat the climate and nature crisis as one indivisible global health emergency

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Stroke & Vascular Neurology 2024年第4期9卷 325-327页

作者： chris Zielinski on behalf of the authorship group listed below Centre for Global Health University of WinchesterWinchesterUK 不详

Over 200 health journals call on the United Nations(UN),political leaders and health professionals to recognise that climate change and biodiversity loss are one indivisible crisis and must be tackled together to pres... 详细信息

关键词： preserve global divisible

Comparison of fusion methods based on DST and DBN in human activity recognition

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控制理论与应用（英文版） 2011年第1期9卷 18-27页

作者： Andrei TOLSTIKOV Jit BISWAS chris NUGENT Guido PARENTE Institute for Infocomm Research Networking Protocols Department1 Fusionopolis Way#21-01Singapore 138632 School of Computing and Mathematics University of UlsterShore RoadNewtownabbeyBT37 0QBU.K.

Ambient assistive living environments require sophisticated information fusion and reasoning techniques to accurately identify activities of a person under care. In this paper, we explain, compare and discuss the application of two powerful fusion methods, namely dynamic Bayesian networks (DBN) and Dempster-Shafer theory (DST), for human activity recognition. Both methods are described, the implementation of activity recognition based on these methods is explained, and model acquisition and composition are suggested. We also provide functional comparison of both methods as well as performance comparison based on the publicly available activity dataset. Our findings show that in performance and applicability, both DST and DBN are very similar; however, significant differences exist in the ways the models are obtained. DST being top-down and knowledge-based, differs significantly in qualitative terms, when compared with DBN, which is data-driven. These qualitative differences between DST and DBN should therefore dictate the selection of the appropriate model to use, given a particular activity recognition application.

关键词： Dynamic Bayesian networks Dempster-Shafer theory Healthcare monitoring Ambient assisted living Activity recognition

Coupling Enhancement of a Flexible BiFeO_(3) Film-Based Nanogenerator for Simultaneously Scavenging Light and Vibration Energies

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Nano-Micro Letters 2022年第12期14卷 137-150页

作者： Xiao Han Yun Ji Li Wu Yanlong Xia chris RBowen Ya Yang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400People’s Republic of China Department of Mechanical Engineering University of BathBath BA27AKUK School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center On Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004People’s Republic of China

Coupled nanogenerators have been a research hotspot due to their ability to harvest a variety of forms of energy such as light,mechanical and thermal energy and achieve a stable direct current *** films are frequently investigated for photovoltaic applications due to their unique photovoltaic properties and bandgap-independent photovoltage,while the flexoelectric effect is an electromechanical property commonly found in solid ***,we effectively construct a new form of coupled nanogenerator based on a flexible BiFeO_(3) ferroelectric film that combines both flexoelectric and photovoltaic effects to successfully harvest both light and vibration *** device converts an alternating current into a direct current and achieves a 6.2% charge enhancement and a 19.3%energy enhancement to achieve a multi-dimensional"1+1>2"coupling enhancement in terms of current,charge and *** work proposes a new approach to the coupling of multiple energy harvesting mechanisms in ferroelectric nanogenerators and provides a new strategy to enhance the transduction efficiency of flexible functional devices.

关键词： Ferroelectric film Coupled nanogenerators Photovoltaic effect Flexoelectric effect Energy collection

Combined peak reduction and self-consumption using proximal policy optimisation

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Energy and AI 2024年第2期16卷 24-31页

作者： Thijs Peirelinck chris Hermans Fred Spiessens Geert Deconinck ESAT KU LeuvenKasteelpark Arenberg 10 bus 24453001 LeuvenBelgium AMO Flemish Institute for Technological Research(VITO)Boeretang 2002400 Mol Belgium AMO EnergyVilleThor Park 83103600 GenkBelgium

Residential demand response programs aim to activate demand flexibility at the household *** recent years,reinforcement learning(RL)has gained significant attention for these type of applications.A major challenge of RL algorithms is data *** RL algorithms,such as proximal policy optimisation(PPO),have tried to increase data *** tionally,combining RL with transfer learning has been proposed in an effort to mitigate this *** this work,we further improve upon state-of-the-art transfer learning performance by incorporating demand response domain knowledge into the learning *** evaluate our approach on a demand response use case where peak shaving and self-consumption is incentivised by means of a capacity *** show our adapted version of PPO,combined with transfer learming,reduces cost by 14.51%compared to a regular hysteresis controller and by 6.68%compared to traditional PPO.

关键词： Demand response Reinforcement learning Electric water heater Peak shaving Transfer learning

The GWmodel R package:further topics for exploring spatial heterogeneity using geographically weighted models

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Geo-Spatial Information Science 2014年第2期17卷 85-101页

作者： Binbin LU Paul HARRIS Martin CHARLTON chris BRUNSDON School of Remote Sensing and Information Engineering Wuhan University129 Luoyu RoadWuhan 430079China Rothamsted Research North WykeOkehamptonDevonUK National Centre for Geocomputation National University of Ireland MaynoothMaynoothCo.KildareIreland

In this study,we present a collection of local models,termed geographically weighted(GW)models,which can be found within the GWmodel R package.A GW model suits situations when spatial data are poorly described by the global form,and for some regions the localized fit provides a better *** approach uses a moving window weighting technique,where a collection of local models are estimated at target ***,model parameters or outputs are mapped so that the nature of spatial heterogeneity can be explored and *** particular,we present case studies using:(i)GW summary statistics and a GW principal components analysis;(ii)advanced GW regression fits and diagnostics;(iii)associated Monte Carlo significance tests for non-stationarity;(iv)a GW discriminant analysis;and(v)enhanced kernel bandwidth selection *** Election data-sets from the Republic of Ireland and US are used for *** study is designed to complement a companion GWmodel study,which focuses on basic and robust GW models.

关键词： principal components analysis semi-parametric GW regression discriminant analysis Monte Carlo tests election data

Virtual vignettes: the acquisition,analysis,and presentation of social network data

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Science China(Information Sciences) 2014年第3期57卷 46-65页

作者： HOWDEN chris LIU Lu LI ZhiYuan LI JianXin ANTONOPOULOS Nick School of Computing and Mathematics University of DerbyDerby DE22 1GBUnited Kingdom School of Computer Science and Telecommunication Engineering Jiangsu University School of Computer Science and Engineering Beihang University School of Computing and Mathematics University of Derby

Online social networks(OSNs)are immensely prevalent and have now become a ubiquitous and important part of the modern,developed ***,online social networks pose significant problems to digital forensic investigators who have no experience *** will reside on multiples of servers in multiple countries,across multiple *** it before it is overwritten or deleted is a known problem,mirrored in other cloud based *** this article,a novel method has been developed for the extraction,analysis,visualization,and comparison of snapshotted user profile data from the online social network *** research follows a process of design,implementation,simulation,and *** code of the tool that was developed to facilitate data extraction has been made available on the Internet.

关键词： online social networks Twitter digital forensics cloud computing social network forensic analysis

A Review of physics-based and data-driven models for real-time control of polymer electrolyte membrane fuel cells

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Energy and AI 2021年第4期6卷 97-129页

作者： Jian Zhao Xianguo Li chris Shum John McPhee Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooOntarioCanada Department of Systems Design Engineering University of WaterlooWaterlooOntarioCanada

The real-time model-based control of polymer electrolyte membrane(PEM)fuel cells requires a computationally efficient and sufficiently accurate model to predict the transient and long-term performance under various operational conditions,involving the pressure,temperature,humidity,and stoichiometry *** this article,recent progress on the development of PEM fuel cell models that can be used for real-time control is *** major operational principles of PEM fuel cells and the associated mathematical description of the transport and electrochemical phenomena are *** reduced-dimensional physics-based models(pseudo-twodimensional,one-dimensional numerical and zero dimensional analytical models)and the non-physics-based models(zero-dimensional empirical and data-driven models)have been systematically examined,and the comparison of these models has been *** is found that the current trends for the real-time control models are(i)to couple the single cell model with balance of plants to investigate the system performance,(ii)to incorporate aging effects to enable long-term performance prediction,(iii)to increase the computational speed(especially for one-dimensional numerical models),and(iv)to develop data-driven models with artificial intelligence/machine learning *** review will be beneficial for the development of physics or nonphysics based models with sufficient accuracy and computational speed to ensure the real-time control of PEM fuel cells.

关键词： Polymer electrolyte membrane fuel cell Physics-based model Real-time control Reduced dimensionality Empirical model Data-driven model Artificial intelligence

Delayed juvenile behavioral development and prolonged dependence are adaptations to desert life in the grey falcon

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Current Zoology 2022年第6期68卷 679-687页

作者： Jonny SCHOENJAHN chris R.PAVEY Gimme H.WALTER School of Biological Sciences The University of QueenslandBrisbaneQLD 4072Australia CSIRO Land and Water DarwinNT 0822Australia

Rapid learning in the young of most endothermic animals can be expected to be favored by natural selection because early independence reduces the period of *** of comparatively slow juvenile development continue,therefore,to attract scientific *** most species of birds,including raptors,the young depend on their parents for some time after fledging for the provisioning of food and for protection while they learn to become nutritionally and otherwise *** raptors,post-fledging dependence periods that exceed 6 months are exclusive to the largest species and these have reproductive cycles that exceed 12 *** contrast,young of the medium-sized grey falcon Falco hypoleucos have been reported in close company with their parents up to 12 months after fledging,that is,at a time when the adults are expected to breed *** investigated the occurrence and characteristics of prolonged adult–juvenile association relative to other falcons and similar-sized *** found that the behavioral development of grey falcon young is extremely delayed,and that they even depend nutritionally on their parents for up to 12 months after *** suggest that these 2 distinctive features are,ultimately,adaptations of the grey falcon to its extreme environment,Australia’s arid and semi-arid zone,one of the hottest environments in the world.

关键词： arid environment behavioral adaptation bird of prey post-fledging period