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| 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 | 早期将抗生素由静脉转为口服治疗严重社区获得性肺炎:多中心随机试验显示文摘目的比较早期由静脉转换成口服抗生素与常规静脉使用7天抗生素治疗严重社区获得性肺炎(CAP)的疗效。设计多中心随机对照试验。地点荷兰5家教学医院和2所大学的医学中心。参加者非 ICU 住院的严重 CAP 患者302例,其中265例满足研究要求。干预静脉抗生素治疗3天,病情稳定后换成口服抗生素,或静脉使用抗生素治疗7天。主要评价结果临床治愈和住院天数。结果 302例患者被随机分组(平均年龄69.5岁,标准差14.0),肺炎严重度评分平均112.7(26.0)。37例患者因为提前3天退出而未纳入分析,对其余265例患者进行分析研究。第28天的死亡率在干预组是4%,对照组是6%(平均差2%,95%可信区间-3%~8%)。临床治愈率在干预组是83%,对照组是85%(2%;-7%~10%)。与对照组相比,干预组患者静脉治疗时间为3.4天[3.6(1.5)比7.0(2.0)天;2.8~3.9],患者住院天数减少1.9天[9.6(5.0)比11.5(4.9)天;0.6~3.2]。结论早期将抗生素由静脉应用转换成口服治疗严重 CAP 是安全的,并且可以减少住院时间2天。试验注册号临床试验 NCT00273676。 | Jan Jelrik Oosterheert Marc J M Bonten Margriet M E Schneider Erik Buskens Jan-Willem J Lammers Willem M N Hustinx Mark H H Kramer Jan M Prins Peter H Th J Slee Karin Kaasjager Andy I M Hoepelman 王伟巍(译) 童朝辉(校) | 2007 | 英国医学杂志中文版2007,10,2: | 1 |
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| 14 | Circulating retinol- binding protein 4, cardiovascular risk factors and prevalent cardiovascular disease in elderly cardiovascular disease in elderly显示文摘 | Erik I Johan S Hakan M | 2009 | Atherosclerosis2009,206,: | 1 |
| 15 | Resilient properties of unbound road materials during seasonal frost conditions显示文摘 | ERIK S VINCENT C J ULF I | 2002 | Journal of Cold Regions Engineering2002,16,1: | 1 |
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| 17 | Circulating retinol-binding protein 4 and subclinical cardiovascular disease in the elderly显示文摘 | Erik I Lars L | 2009 | Diabetes Care2009,32,4: | 1 |
| 18 | Cloning,sequencing,and expression of interferon-gamma from elk in North America显示文摘 | SWEENEY S EMERSON C ERIKS I | 2001 | J Wildl Dis2001,37,1: | 1 |
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