目的检索、评价及总结老年肌少症患者运动干预的最佳证据。方法计算机检索BMJ最佳实践、UP TO DATE、澳大利亚JBI循证卫生保健中心数据库、英国国家卫生与临床优化研究所、加拿大安大略注册护士协会、PubMed、中国生物医学数据库、万方...目的检索、评价及总结老年肌少症患者运动干预的最佳证据。方法计算机检索BMJ最佳实践、UP TO DATE、澳大利亚JBI循证卫生保健中心数据库、英国国家卫生与临床优化研究所、加拿大安大略注册护士协会、PubMed、中国生物医学数据库、万方、中国知网、美国运动医学会等专业网站或数据库中关于老年肌少症患者运动干预的文献,检索时限为2015年1月1日至2021年3月31日。结果共纳入9篇文献,包括指南1篇、证据总结1篇、系统评价6篇、专家共识1篇,最终总结出包括运动前评估、运动方式、运动频率及运动时间、效果评价4个方面的10条最佳证据。结论本研究总结了老年肌少症患者运动干预的最佳证据,建议医护人员对患者进行运动前评估,选择个体化的运动方式、频率和时间,动态监测患者的肌肉力量、质量和活动能力。展开更多
Precoding and space-time block coding （STBC）techniques using the uniform channel decomposition （UCD）are proposed to improve the bit error rate （BER） of themultiple-antenna communication system, but at a cost of ...Precoding and space-time block coding （STBC）techniques using the uniform channel decomposition （UCD）are proposed to improve the bit error rate （BER） of themultiple-antenna communication system, but at a cost of areduced data rate. In order to achieve a higher overall systemperformance, a novel adaptive transceiver architecture whichflexibly combines both UCD and UCD ＋ STBC technologies isproposed. The channel state information （CSI） feedback pathwas added to the precoder to select which coding method wasto be used, i.e. UCD alone or UCD ＋ STBC. With thesmaller constellation sizes, Matlab simulation results showthat, the adaptive transceiver architecture will select the UCD-only mode under the higher SNR conditions in order to achievea higher bit rate. The UCD ＋ STBC mode will be selectedunder the lower SNR conditions （e. g., SNR 〈 10 dB） inorder to maintain good BER performance at the cost of areduced data rate. This architecture was implemented andverified using both UMC 0.18 ASIC process technology and aXilinx xc4vlx Virtex-4 FPGA at 150 MHz. The simulationresults demonstrate that the required number of reconfigurablearithmetic unit slices grows linearly with the channel matrixsize, while the number of adder array unit and reconfigurablelogic unit slices increases slightly with the constellation size.展开更多
文摘目的检索、评价及总结老年肌少症患者运动干预的最佳证据。方法计算机检索BMJ最佳实践、UP TO DATE、澳大利亚JBI循证卫生保健中心数据库、英国国家卫生与临床优化研究所、加拿大安大略注册护士协会、PubMed、中国生物医学数据库、万方、中国知网、美国运动医学会等专业网站或数据库中关于老年肌少症患者运动干预的文献,检索时限为2015年1月1日至2021年3月31日。结果共纳入9篇文献,包括指南1篇、证据总结1篇、系统评价6篇、专家共识1篇,最终总结出包括运动前评估、运动方式、运动频率及运动时间、效果评价4个方面的10条最佳证据。结论本研究总结了老年肌少症患者运动干预的最佳证据,建议医护人员对患者进行运动前评估,选择个体化的运动方式、频率和时间,动态监测患者的肌肉力量、质量和活动能力。
基金The National Natural Science Foundation of China(No.61376025)the Industry-Academic Joint Technological Innovations FundP roject of Jiangsu(No.BY2013003-11)the Scientific Innovation Research of College Graduates in Jiangsu Province(No.KYLX_0273)
文摘Precoding and space-time block coding （STBC）techniques using the uniform channel decomposition （UCD）are proposed to improve the bit error rate （BER） of themultiple-antenna communication system, but at a cost of areduced data rate. In order to achieve a higher overall systemperformance, a novel adaptive transceiver architecture whichflexibly combines both UCD and UCD ＋ STBC technologies isproposed. The channel state information （CSI） feedback pathwas added to the precoder to select which coding method wasto be used, i.e. UCD alone or UCD ＋ STBC. With thesmaller constellation sizes, Matlab simulation results showthat, the adaptive transceiver architecture will select the UCD-only mode under the higher SNR conditions in order to achievea higher bit rate. The UCD ＋ STBC mode will be selectedunder the lower SNR conditions （e. g., SNR 〈 10 dB） inorder to maintain good BER performance at the cost of areduced data rate. This architecture was implemented andverified using both UMC 0.18 ASIC process technology and aXilinx xc4vlx Virtex-4 FPGA at 150 MHz. The simulationresults demonstrate that the required number of reconfigurablearithmetic unit slices grows linearly with the channel matrixsize, while the number of adder array unit and reconfigurablelogic unit slices increases slightly with the constellation size.
