终端直通(device-to-device,D2D)通信技术已成为第五代移动通信(5G)中的关键技术。资源分配直接关系着D2D通信的质量,是D2D通信中的重要研究内容。该文研究了正交频分多址接入(orthogonal frequency division multiple access,OFDMA)蜂...终端直通(device-to-device,D2D)通信技术已成为第五代移动通信(5G)中的关键技术。资源分配直接关系着D2D通信的质量,是D2D通信中的重要研究内容。该文研究了正交频分多址接入(orthogonal frequency division multiple access,OFDMA)蜂窝网络中的D2D通信,用统计服务质量(quality-of-service,QoS)保证来刻画用户的时延需求,在保证蜂窝用户的干扰门限要求下,以最大化统计带QoS保证的系统吞吐量为目标,提出了有效的资源分配算法。通过Lagrange方法求解原始优化问题,提出了交替式优化算法和渐进凸近似算法。仿真表明,所提方案能有效提升系统性能。展开更多
The outbreak of a novel coronavirus disease(COVID-19,caused by the 2019-nCoV infection)in December 2019 is one of the most severe public health emergencies since the founding of People’s Republic of China in 1949.Hea...The outbreak of a novel coronavirus disease(COVID-19,caused by the 2019-nCoV infection)in December 2019 is one of the most severe public health emergencies since the founding of People’s Republic of China in 1949.Healthcare personnel(HCP)nationwide are facing heavy workloads and high risk of infection,especially those who care for patients in Hubei Province.Sadly,as of February 20,2020,over two thousand COVID-19 cases are confirmed among HCP from 476 hospitals nationwide,with nearly 90%of them from Hubei Province.Based on literature search and interviews with some HCP working at Wuhan,capital city of Hubei,we have summarized some of the effective measures taken to reduce infection among HCP,and also made suggestions for improving occupational safety during an infectious disease outbreak.The experience and lessons learned should be a valuable asset for international health community to contain the ongoing COVID-19 epidemic around the world.展开更多
文摘终端直通(device-to-device,D2D)通信技术已成为第五代移动通信(5G)中的关键技术。资源分配直接关系着D2D通信的质量,是D2D通信中的重要研究内容。该文研究了正交频分多址接入(orthogonal frequency division multiple access,OFDMA)蜂窝网络中的D2D通信,用统计服务质量(quality-of-service,QoS)保证来刻画用户的时延需求,在保证蜂窝用户的干扰门限要求下,以最大化统计带QoS保证的系统吞吐量为目标,提出了有效的资源分配算法。通过Lagrange方法求解原始优化问题,提出了交替式优化算法和渐进凸近似算法。仿真表明,所提方案能有效提升系统性能。
文摘The outbreak of a novel coronavirus disease(COVID-19,caused by the 2019-nCoV infection)in December 2019 is one of the most severe public health emergencies since the founding of People’s Republic of China in 1949.Healthcare personnel(HCP)nationwide are facing heavy workloads and high risk of infection,especially those who care for patients in Hubei Province.Sadly,as of February 20,2020,over two thousand COVID-19 cases are confirmed among HCP from 476 hospitals nationwide,with nearly 90%of them from Hubei Province.Based on literature search and interviews with some HCP working at Wuhan,capital city of Hubei,we have summarized some of the effective measures taken to reduce infection among HCP,and also made suggestions for improving occupational safety during an infectious disease outbreak.The experience and lessons learned should be a valuable asset for international health community to contain the ongoing COVID-19 epidemic around the world.
