|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Towards 6G wireless communication networks:vision,enabling technologies,and new paradigm shifts显示文摘The fifth generation(5G)wireless communication networks are being deployed worldwide from 2020 and more capabilities are in the process of being standardized,such as mass connectivity,ultra-reliability,and guaranteed low latency.However,5G will not meet all requirements of the future in 2030 and beyond,and sixth generation(6G)wireless communication networks are expected to provide global coverage,enhanced spectral/energy/cost efficiency,better intelligence level and security,etc.To meet these requirements,6G networks will rely on new enabling technologies,i.e.,air interface and transmission technologies and novel network architecture,such as waveform design,multiple access,channel coding schemes,multi-antenna technologies,network slicing,cell-free architecture,and cloud/fog/edge computing.Our vision on 6G is that it will have four new paradigm shifts.First,to satisfy the requirement of global coverage,6G will not be limited to terrestrial communication networks,which will need to be complemented with non-terrestrial networks such as satellite and unmanned aerial vehicle(UAV)communication networks,thus achieving a space-airground-sea integrated communication network.Second,all spectra will be fully explored to further increase data rates and connection density,including the sub-6GHz,millimeter wave(mmWave),terahertz(THz),and optical frequency bands.Third,facing the big datasets generated by the use of extremely heterogeneous networks,diverse communication scenarios,large numbers of antennas,wide bandwidths,and new service requirements,6G networks will enable a new range of smart applications with the aid of artificial intelligence(AI)and big data technologies.Fourth,network security will have to be strengthened when developing 6G networks.This article provides a comprehensive survey of recent advances and future trends in these four aspects.Clearly,6G with additional technical requirements beyond those of 5G will enable faster and further communications to the extent that the boundary between physical and cyber worlds disappears. | Xiaohu YOU Cheng-Xiang WANG Jie HUANG Xiqi GAO Zaichen ZHANG Mao WANG Yongming HUANG Chuan ZHANG Yanxiang JIANG Jiaheng WANG Min ZHU Bin SHENG Dongming WANG Zhiwen PAN Pengcheng ZHU Yang YANG Zening LIU Ping ZHANG Xiaofeng TAO Shaoqian LI Zhi CHEN Xinying MA Chih-Lin I Shuangfeng HAN Ke LI Chengkang PAN Zhimin ZHENG Lajos HANZO Xuemin(Sherman)SHEN Yingjie Jay GUO Zhiguo DING Harald HAAS Wen TONG Peiying ZHU Ganghua YANG Jun WANG Erik GLARSSON Hien Quoc NGO Wei HONG Haiming WANG Debin HOU Jixin CHEN Zhe CHEN Zhangcheng HAO Geoffrey Ye LI Rahim TAFAZOLLI Yue GAO HVincent POOR Gerhard P.FETTWEIS Ying-Chang LIANG | 2021 | Science China(Information Sciences)2021，64，1： | 122 |
| 2 | Calculation of Ecological Footprint Based on Modified Method and Quantitative Analysis of Its Impact Factors——A Case Study of Shanghai显示文摘Ecological footprint(EF) has attracted much attention internationally as a potential indicator for sustainable development.In China,EF has also gained recognition in related fields and disciplines.Moreover,some scholars in these fields have proposed alternative methods to calculate EF and have made some progress.This paper,therefore,begins with the introduction and development of EF in China.However,the established methods of EF calculation hold some limitations,such as indicator variance and result abnormality.In order to resolve those problems,the authors make a further modification considering the demand of EF as a comprehensive indicator:1) More accurate analysis has been done to divide EF into several parts:imported EF,exported EF,and producible EF,which is the solution to the problem of abnormality in original EF results and can explain abnormal phenomena reasonably.2) Considering the actual situa-tion of Shanghai,amended equivalence factor is brought forward and a matrix is formed with equivalence factors.The measure can reduce the deviation between the fact and the results.3) The calculation compares local yield with global average yield to analyze the effects of yields.And based on local yields in different years,the results are more accurate.Finally,the calculation method is applied to calculating EF of Shanghai from 1980 to 2003,and the subsequent detailed analysis is presented.Available data and results suggest a statistically significant correlation coefficient between EF and GDP,population density and urbanization level.Through analyzing the process of calculating EF and its results,it can be seen that EF,as a macro-indicator,can not exactly indicate whether development within a region can meet the re-quests of sustainable development,which can be explained by the fact that the result of EF is impacted greatly by sub-jective factors including national policy,available technology,population,etc.Nevertheless,EF can demonstrate,at least to some degree,the regional status in terms of resources and energy consumption,as well as developmental potential.The calculation of EF,therefore,deserves further research to achieve more far-reaching significance in application. | GAO Chengkang JIANG Dahe WANG Dan YAN Jonathan | 2006 | Chinese Geographical Science2006，16，4： | 4 |
| 3 | Comprehensive and high-resolution emission inventory of atmospheric pollutants for the northernmost cities agglomeration of Harbin-Changchun,China:Implications for local atmospheric environment management显示文摘Using a bottom-up estimation method,a comprehensive,high-resolution emission inventory of gaseous and particulate atmospheric pollutants for multiple anthropogenic sectors with typical local sources has been developed for the Harbin-Changchun city agglomeration(HCA).The annual emissions for CO,NO_(x),SO_(2),NH_(3),VOC S,PM_(2.5),PM 10,BC and OC during 2017 in the HCA were estimated to be 5.82 Tg,0.70 Tg,0.34 Tg,0.75 Tg,0.81 Tg,0.67 Tg,1.59 Tg,0.12 Tg and 0.26 Tg,respectively.For PM 10 and SO_(2),the emissions from industry processes were the dominant contributors representing 54.7%and 49.5%,respectively,of the total emissions,while 95.3%and 44.5%of the total NH_(3)and NO x emissions,respectively,were from or associated with agricultural activities and transportation.Spatiotemporal distributions showed that most emissions(except NH_(3))occurred in November to March and were concentrated in the central cities of Changchun and Harbin and the surrounding cities.Open burning of straw made an important contribution to PM_(2.5)in the central regions of the northeastern plain during autumn and spring,while domestic coal combustion for heating purposes was significant with respect to SO_(2)and PM_(2.5)emissions during autumn and winter.Furthermore,based on Principal Component Analysis and Multivariable Linear Regression model,air temperature,relative humidity,electricity and energy consumption,and the urban and rural population were optimized to be representative indicators for rapidly assessing the magnitude of regional atmospheric pollutants in the HCA.Such indicators and equations were demonstrated to be useful for local atmospheric environment management. | Mengduo Zhang Weiwei Chen Xiangjin Shen Hongmei Zhao Chengkang Gao Xuelei Zhang Wei Liu Chengjiang Yang Yang Qin Shichun Zhang Jing Fu Daniel Tong Aijun Xiu | 2021 | Journal of Environmental Sciences2021，33，6： | 3 |
| 4 | Channel-aware multi-user uplink transmission scheme for SIMO-OFDM systems显示文摘The problem of medium access control(MAC) in wireless single-input multiple-output-orthogonal frequency division multiplexing(SIMO-OFDM) systems is addressed. Traditional random access protocols have low overheads and inferior performance. Centralized methods have superior performance and high overheads. To achieve the tradeoff between overhead and performance,we propose a channelaware uplink transmission(CaUT) scheme for SIMO-OFDM systems. In CaUT,users transmit requestto-send(RTS) at some subcarriers whose channel gains are above a predetermined threshold. Using the channel state information provided by RTS,access point performs user selection with receive beamforming to decide which users can access and then broadcasts the selection results via clear-to-send(CTS) to users. We present a distributed power control scheme by using a simple fixed modulation mode. We optimize the modulation order and channel gain thresholds to maximize the separable packets subject to the bit-error-rate(BER) and temporal fairness requirements and the individual average transmit power constraints. The performance of CaUT scheme is analyzed analytically and evaluated by simulations. Simulation results show that CaUT can achieve more significant throughput performance than traditional random access protocols. | PAN ChengKang CAI YueMing XU YouYun | 2009 | Science in China(Series F)2009，52，9： | 2 |
| 5 | Activation of the bitter taste sensor TRPM5 prevents high saltinduced cardiovascular dysfunction显示文摘High salt intake is a known risk factor of cardiovascular diseases. Our recent study demonstrated that long-term high salt intake impairs transient receptor potential channel M5(TRPM5)-mediated aversion to high salt concentrations, consequently promoting high salt intake and hypertension;however, it remains unknown whether TRPM5 activation ameliorates cardiovascular dysfunction. Herein we found that bitter melon extract(BME) and cucurbitacin E(CuE), a major compound in BME, lowered high salt-induced hypertension. Long-term BME intake significantly enhanced the aversion to high salt concentrations by upregulating TRPM5 expression and function, eventually decreasing excessive salt consumption in mice. Moreover, dietary BME ameliorated high salt-induced cardiovascular dysfunction and angiotensin II-induced hypertension in vivo. The mechanistic evidence demonstrated that dietary BME inhibited high salt-induced RhoA/Rho kinase pathway overactivation, leading to reduced phosphorylation levels of myosin light chain kinase and myosin phosphatase targeting subunit 1. Furthermore, CuE inhibited vasoconstriction by attenuating L-type Ca^(2+) channel-induced Ca^(2+) influx in vascular smooth muscle cells. To summarize, our findings indicate that dietary BME has a beneficial role in antagonizing excessive salt consumption and thus appears promising for the prevention of high salt-induced cardiovascular dysfunction. | Hao Wu Yuanting Cui Chengkang He Peng Gao Qiang Li Hexuan Zhang Yanli Jiang Yingru Hu Xiao Wei Zongshi Lu Tianyi Ma Daoyan Liu Zhiming Zhu | 2020 | Science China(Life Sciences)2020，63，11： | 2 |
| 6 | Replanting of broadleaved trees alters internal nutrient cycles of native and exotic pines in subtropical plantations of China显示文摘Background:The replanting of broadleaved trees in pure coniferous plantations is widely implemented,as mixed plantations are generally more stable and functional.However,the effect of interspecific interactions between broadleaved and coniferous trees on internal nutrient cycles of conifers remains unclear.Methods:We selected pure coniferous plantations of a native(Pinus massoniana)and an exotic(P.elliottii)pine species and their corresponding mixed plantations with broadleaved trees(Schima superba)in subtropical China,and measured the nitrogen(N)and phosphorus(P)contents in the rhizosphere soils,fine roots,twigs,needles and needle litter of pines.We calculated the root capture,needle resorption and translocation of N and P by pines to determine the mobility of nutrients in trees.Results:Although the N and P in the rhizosphere soils increased due to the replanting of broadleaved trees,the N and P contents in the aboveground tissues of the two pine species did not increase in mixed plantations.Mixed planting had a negative effect on the N and P capture of native pine and a positive effect on that of exotic pine.The N and P resorption efficiencies increased in native pine but were unchanged in exotic pine after the replanting of S.superba.Native pine preferentially employed an aboveground nutrient resorption strategy,whereas exotic pine tended to adopt a belowground nutrient capture strategy after replanting.Translocation of N and P in trees was detected,which reflected the trade-offs between root nutrient capture and needle nutrient resorption.Conclusions:The effect of mixed planting varied between the species of native and exotic pines,and the internal nutrient cycles of both pine species might be dominated by interspecific interaction effects on nutrients rather than soil nutrients.Our study highlights the importance of selecting suitable broadleaved species for replanting in coniferous plantations. | Yong Lin Chengkang Xia Gaoyang Wu Fangchao Wang Shengnan Wang Yuanqiu Liu Fusheng Chen | 2022 | Forest Ecosystems2022，9，5： | 2 |
| 7 | Manufacturing process for a cylindrical crown gear drive with a controllable fourth order polynomial function of transmission error 显示文摘 | LEE Chengkang | 2009 | Jotmaal of Materials Processing Technology2009，209，1： | 1 |
| 8 | Radio Access Network Slicing Based on C/U Plane Separation显示文摘Network slicing achieves many interests from industry and academics due to its flexibility and scalability.In this paper,we present a novel slicing scheme for radio access networks(RANs) based on control/user(C/U) plane separation.Firstly,we divide e NBs into two sub-e NBs called Ce NB and Ue NB,for transmitting control data and user data respectively,thereby facilitating C/U plane separation.Secondly,upon Ce NBs and Ue NBs being virtualized,we develop two RAN slices for control and user plane respectively.Experimental results show the feasibility of the proposed scheme. | Hui Zhao Liqiang Zhao Kai Liang Chengkang Pan | 2017 | China Communications2017，14，12： | 1 |
| 9 | Eu^2+ ac- tivated long persistent strontium aluminate nano scaled phosphor prepared by precipitation method 显示文摘 | CHANG Chengkang YUAN Zhaoxin MAO Dali | 2006 | Journal of Alloys and Compounds2006，415，11： | 1 |
| 10 | Using human-centered design to improve the assault rifle显示文摘 | KUO CHENGLANG YUAN CHENGKANG LIU BOR- SHONG et ai | 2012 | Applied Ergonomics2012，43，6： | 1 |
| 11 | Promotive effect of multi-walled carbon nanotubes on Co_3O_4 nanosheets and their application in lithium-ion battery显示文摘Co3O4/MWCNTs composites have been synthesized by a simple hydrothermal method using a surfactant(CTAB) and a precipitation agent(urea). The samples were characterized by XRD, SEM and BET methods. The electrochemical properties of the samples as anode materials for lithium batteries were studied by EIS and Galvanostatic measurements. The Co3O4/MWCNTs composites displayed higher capacity and better cycle performance in comparison with the Co3O4 nanosheets. The remarkable improvement of electrochemical performance within the hybrid composites is probably related to the addition of MWCNTs that possesses improved properties such as excellent electric conductivity and large surface area, which helps to alleviate the effect of volume change, shorten the distance of lithium ion diffusion, facilitate the transmission of electron and keep the structure stable. | Yan Liu Xiaogang Zhang Chengkang Chang Dongyun Zhang Ying Wu | 2014 | Progress in Natural Science:Materials International2014，24，3： | 1 |
| 12 | Luminescent properties of CaMgSi2O6 and Ca2 MgSi2O7 phosphors activated by Eu^2+, Dy^3+ and Nd^3+ 显示文摘 | Jiang Ling Chang Chengkang Mao Dali | 2003 | J Alloys Compounds2003，360，1： | 1 |
| 13 | Stabilization of coupled linear plant and reaction-diffusion process显示文摘 | Ailiang Zhao Chengkang Xie | 2014 | Journal of Franklin In- stitute2014，，351： | 1 |
| 14 | Prepartion of Long Persistent SrO-2Al2O3 Ceramics and their Luminescent Properties显示文摘 | Chang Chengkang Mao Dali Shen Jianfeng | 2004 | Journal of Alloys and Compounds2004，384，： | 1 |
| 15 | Preparation and in vitro bioactivities of calcium silicate nanophase materials 显示文摘 | Xianghui Wan Chengkang Chang Dali Man | 2005 | Materials Science and Engineering C2005，25，： | 1 |
| 16 | 显示文摘 | Chang Chengkang Mao Dali Shen Jianfeng | 2003 | Journal of Alloys and Compounds2003，348，： | 1 |
| 17 | Luminescent properties of CaMgSi2O6 and Ca2 MgSi2 O7 phosphors activated by Eu^2+, Dy^2+ and Nd^3+ 显示文摘 | Jiang Ling Chang Chengkang Mao Dali | 2003 | Journal of Alloys and Compounds2003，360，： | 1 |
| 18 | Prepara- tion of long persistent SrO : 2A12 Oa ceramics and their lumi- nescent properties显示文摘 | Chang Chengkang Mao Dali Shen Jianfeng | 2003 | J Alloy Compd2003，348，12： | 1 |
| 19 | Luminescent properties of Sr 2 MgSi 2 O 7 and Ca 2 MgSi 2 O 7 long lasting phosphors activated by Eu 2+ , Dy 3+显示文摘 | Qin Fei Chengkang Chang Dali Mao | 2004 | Journal of Alloys and Compounds2004，，1： | 1 |
| 20 | Tunable emission and concentration quenching of Tb 3+ in magnesium phosphate lithium显示文摘 | Mingming Shi Dongyun Zhang Chengkang Chang | 2014 | Journal of Alloys and Compounds2014，，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员