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Deep CLSTM for Predictive Beamforming in Integrated Sensing and Communication-Enabled Vehicular Networks

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Journal of Communications and Information Networks 2022年第3期7卷 269-277页

作者： Chang liu Xuemeng liu Shuangyang Li Weijie Yuan Derrick Wing Kwan ng School of Electrical Engineering and Telecommunications the University of New South WalesSydneyNSW 2052Australia School of Electrical and Information Engineering the University of SydneySydneyNSW 2006Australia Department of Electrical Electronic and Computer Engineeringthe University of Western AustraliaPerth WA 6009Australia Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China

Predictive beamforming design is an essential task in realizing high-mobility integrated sensing and communication(ISAC),which highly depends on the accuracy of the channel prediction(CP),i.e.,predicting the angular parameters of ***,the performance of CP highly depends on the estimated historical channel stated information(CSI)with estimation errors,resulting in the performance degradation for most traditional CP *** further improve the prediction accuracy,in this paper,we focus on the ISAC in vehicle networks and propose a convolutional long-short term memory(CLSTM)recurrent neural network(CLRNet)to predict the angle of vehicles for the design of predictive *** the developed CLRNet,both the convolutional neural network(CNN)module and the LSTM module are adopted to exploit the spatial features and the temporal dependency from the estimated historical angles of vehicles to facilitate the angle ***,numerical results demonstrate that the developed CLRNet-based method is robust to the estimation error and can significantly outperform the state-of-the-art benchmarks,achieving an excellent sum-rate performance for ISAC systems.

关键词： integrated sensing and communication predictive beamforming deep learning convolutional longshort term neural network vehicular networks

Regulatory networks between Polycomb complexes and non-coding RNAs in the central nervous system

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Journal of Molecular Cell Biology 2020年第5期12卷 327-336页

作者： Ya-Jie Xu Pei-Pei liu Shyh-Chang ng Zhao-Qian Teng Chang-Mei liu State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Savaid Medical School University of Chinese Academy of SciencesBeijing 100049China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China

High-throughput sequencing has facilitated the identification of many types of non-coding RNAs(ncRNAs)involved in diverse cellular *** as epigenetic mediators play key roles in neuronal development,maintenance,and dysfunction by controlling gene expression at multiple *** may not only target specific DNA or RNA for gene silence but may also directly interact with chromatin-modifying proteins like Polycomb group(PcG)proteins to drive orchestrated transcriptional *** significant progress has been made in characterizing ncRNAs and PcG proteins involved in transcriptional,post-transcriptional,and epigenetic *** importantly,dysregulation of ncRNAs,PcG proteins,and interplay among them is closely associated with the pathogenesis of central nervous system(CNS)*** this review,we focus on the interplay between ncRNAs and PcG proteins in the CNS and highlight the functional roles of the partnership during neural development and diseases.

关键词： epigenetics Polycomb complexes non-coding RNAs central nervous system neurological diseases

You shall never walk alone:burnout and depression amongst healthcare professionals

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Hepatobiliary Surgery and Nutrition 2021年第5期10卷 678-681页

作者： Kelvin Lin Chieh ng Chen liu Institute of Mental Health SingaporeSingapore United Family Hospital BeijingChina

There are two stages of tsunami,first is the earthquake in deep sea,followed by *** are three waves of pandemic,the death toll,economic and social disruption,and a psychological storm that is looming in the distance *** this time of worldwide COVID-19 pandemic,to date,we have seen over 200 million cases worldwide,and the death toll is in excess of 4 million,and there are various news reports coming in about devastating economic and social ***,numerous studies report that the public,as well as the healthcare professionals are at heightened risk mental health problems in the short and longer term from pandemic.

关键词： storm earthquake alone

Uniqueness and perturbation bounds for sparse non-negative tensor equations

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Frontiers of Mathematics in China 2018年第4期13卷 849-874页

作者： Dongdong liu Wen LI Michael K. ng Seak-Weng VOng School of Applied Mathematics Guangdong University of Technology Guangzhou 510006 China School of Mathematical Sciences South China Normal University Guangzhou 510631China Department of Mathematics Hong Kong Baptist University Hong Kong China Department of Mathematics University of Macao Macao China

We discuss the uniqueness and the perturbation analysis for sparse non-negative tensor equations arriving from data sciences. By two different techniques, we may get better ranges of parameters to guarantee the uniqueness of the solution of the tensor equation. On the other hand, we present some perturbation bounds for the tensor equation. Numerical examples are given to show the efficiency of the theoretical results.

关键词： Stochastic tensor tensor equation uniqueness perturbation

Incorporating geotechnical and geophysical investigations for underground obstruction detection:A case study

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Underground Space 2023年第4期11卷 116-129页

作者： Yaohui liu Yannick C.H.ng Yunhuo Zhang Ping Yang Taeseo Ku School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221000China Department of Civil and Environmental Engineering National University of Singapore117576Singapore Geotechnical&Tunnel Division Land Transport Authority Singapore219428Singapore Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Department of Civil and Environmental Engineering Konkuk UniversitySeoul 05029South Korea

Determining the location and boundary of underground obstructions and/or anomalies is a common problem and often a great chal-lenge for tunneling and underground *** this study,geotechnical investigations(penetration tests and borehole drilling/sam-pling)and geophysical investigations(surface wave method and cross-hole seismic method)were conducted with the aim of identifying the location and boundary of rock obstructions in Changi East,*** surface wave method is frequently used in the sites with lateral homogeneity in previous studies,but its application in the sites with rock obstructions is *** experimental results of this study indicate that the surface wave method is also able to determine the upper surface of rock obstructions,but difficult to identify the lateral and bottom boundaries of rock *** improve the precision of detection,the full waveform inversion(FWI)method was used to process the data from the cross-hole seismic *** results indicate that the inversion precision of P-wave is higher than that of *** horizontal and vertical ranges of rock obstructions in the P-wave inversion results are 14–26 m and 7.5–11.0 m respectively,roughly consistent with the results of penetration tests(about 15–25 m)and borehole log(8.85–10.80 m).This result proves that the sequential application of first-arrival time analysis and FWI can effectively delineate the boundary of rock ***,the results of various detection methods were analyzed and compared in this *** the advantages of various methods,we propose a cost-effective and high-precision workflow containing both geotechnical and geophysical investigations.

关键词： FWI Geotechnical and geophysical investigations Cross-hole seismic method Surface wave method Obstruction detection

ROLLIng CONTACT FATIGUE BEHAVIOR OF CERAMIC BALLS LUBRICATED BY LUBRICANTS WITH EXTREME PRESSURE ADDITIVES

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Chinese Journal of Mechanical Engineering 2006年第2期19卷 195-199页

作者： ZHAng Feng S0ng Baoyu QU Jianjun liu Weimin School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000 China

An experiment is conducted to investigate the effects of lubricant10#, which contains extreme pressure additives T304 and T305, on the rolling contact fatigue （RCF） life of the contact pairs of a Si3N4 ceramic ball and a steel rod. The experimental investigation is carried out using a ball-rod RCF test rig. The results show that the extreme pressure additives increase the anti-contact-fatigue performance of ceramic balls; When the content of the additives varies from 1% to 5%, the increasing gradient of the RCF life curve decreases; And the oil sample with 1% T305 additive corresponds to the maximal gradient of the RCF life curve, with the RCF life being increased by about 10.77 times. The fatigue surface of the ceramic ball is analyzed with scanning electron microscope （SEM） and X-ray electron dispersion analysis（EDAX）, and the physical model of extreme pressure additives＇ increasing the RCF life of the ceramic ball is proposed. It is found that the extreme pressure additives form a corrosive film and a transfer film on the surface of the ceramic ball, which decrease the surface tangential stress, and to increase the surface energy is the most effective means for increasing the RCF life.

关键词： Ceramic bearing Si3N4 ceramic Rolling contact fatigue Extreme pressure additive

Mobile technology:Usage and perspective of patients and caregivers presenting to a tertiary care emergency department

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World Journal of Emergency Medicine 2020年第1期11卷 5-11页

作者： Zhenghong liu Mingwei ng Dinesh V.Gunasekeran Huihua Li Kishanti Ponampalam R Ponampalam SingHealth Emergency Medicine Residency Programme Singapore Health ServicesSingapore Ministry of Health Holdings Singapore Health Services Research Unit Singapore General HospitalSingapore University of Newcastle Australia Department of Emergency Medicine Singapore General HospitalSingapore

BACKGROUND:Developments in information technology(IT)have driven a push in healthcare innovation in the emergency department(ED).Many of these applications rely on mobile technology(MT)such as smartphones but not everyone is comfortable with MT *** study aims to characterize the technology usage behavior of users in the ED so as to guide the implementation of IT interventions in the ***:A cross-sectional survey was conducted in the emergency department of a tertiary *** and their caregivers aged 21 and above were *** survey collected demographic information,technology usage patterns,and participant reported comfort level in the usage of *** performed descriptive statistics and multivariate logistic regression to identify factors differentially associated with comfort in usage of ***:A total of 498 participants were recruited,and 299(60%)were *** was the most commonly written and read language(66.9%)and 64.2%reported a comfort level of 3/5 or more in using *** that were associated with being comfortable in using MT include having a tertiary education,being able to read and write English,as well as being a frequent user of *** were more likely to display these ***:A large proportion of ED patients are not comfortable in the usage of *** that predicted comfort level in the usage of MT were common amongst *** interventions should take this into consideration in the design of MT interventions.

关键词： Mobile health technology Information technology Emergency department

Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7

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Journal of Advanced Ceramics 2021年第1期10卷 120-128页

作者： Xingxing WU Shouyu WAng Winnie WOng-ng Qiang GU Yao JIAng Chao WAng Shuang MA Weifang liu Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China College of Physics and Material Science Tianjin Normal UniversityTianjin 300074China Materials Measurement Science Division National Institute of Standards and TechnologyGaithersburgMaryland 20899USA

Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Tii ***7 ceramics were successfully synthesized by conventional solid-state reaction *** strongest diffraction peaks located around 2θ=33°shifted towards the lower angle region with Ru substitution,reflecting structure *** growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field about 20 kV/*** bandgap estimated by UV-vis diffuse reflectance(DR)spectrum and X-ray photoelectron spectroscopy(XPS)valence band spectra showed a decreasing trend due to the existence of impurity energy level upon Ru doping,which was consistent with the results of first-principles *** origin of the unexpected induced magnetic moments in Ru-dope Ca3Ti2O7 is also discussed.

关键词： oxides electronic materials optical properties X-ray diffraction defects lectronic structure ferroelectricity

Cutting CO_(2)emissions through demand side regulation:Implications from multi-regional input-output linear programming model

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Frontiers of Engineering Management 2022年第3期9卷 452-461页

作者： Nan liu Jidong KAng Tsan Sheng ng Bin SU School of Management Tianjin Normal UniversityTianjin 300387China Energy Studies Institute National University of SingaporeSingapore 119620Singapore Department of Industrial&Systems Engineering and Management National University of SingaporeSingapore 117576Singapore

This study combines multi-regional inputoutput(MRIO)model with linear programming(LP)model to explore economic structure adjustment strategies for the reduction of carbon dioxide(CO_(2))emissions.A particular feature of this study is the identification of the optimal regulation sequence of final products in various regions to reduce CO_(2)emissions with the minimum loss in gross domestic product(GDP).By using China's MRIO tables 2017 with 28 regions and 42 economic sectors,results show that reduction in final demand leads to simultaneous reductions in GDP and CO_(2)***,certain demand side regulation strategy can be adopted to lower CO_(2)emissions at the smallest loss of economic *** key final products,such as metallurgy,nonmetal,metal,and chemical products,should first be regulated to reduce CO_(2)emissions at the minimum loss in *** of these key products concentrate in the coastal developed regions in *** proposed MRIO-LP model considers the inter-relationship among various sectors and regions,and can aid policy makers in designing effective policy for industrial structure adjustment at the regional level to achieve the national environmental and economic targets.

关键词： CO_(2)emissions demand side regulation multi-regional input-output model linear programming model