Fast growth of mobile internet and internet-of-things has propelled the concept formation and research on 5G wireless communications systems which are to be standardized around 2020(IMT-2020).There will be diverse app...Fast growth of mobile internet and internet-of-things has propelled the concept formation and research on 5G wireless communications systems which are to be standardized around 2020(IMT-2020).There will be diverse application scenarios expected for 5G networks.Hence,key performance indicators(KPIs) of 5G systems would be very diverse,not just the peak data rate and average/edge spectral efficiency requirements as in previous generations.For each typical scenario,multiple technologies may be used independently or jointly to improve the transmission efficiency,to lower the cost,and to increase the number of connections,etc.Key enabling technologies are discussed which include massive MIMO,ultradense deployment specific techniques,nonorthogonal transmission,high frequency communications,etc.展开更多
Based on the basic selection criteria of Globally Important Agricultural Heritage Systems(GIAHS)and food and livelihood security research trends,this paper established an evaluation framework and indicator system for ...Based on the basic selection criteria of Globally Important Agricultural Heritage Systems(GIAHS)and food and livelihood security research trends,this paper established an evaluation framework and indicator system for food and livelihood security in GIAHS and selected the first GIAHS site in the Qinghai-Tibet Plateau as a case for empirical evaluation.The results demonstrate that the food and livelihood security of farmers at this site was at a medium level,with an average evaluation value of 2.91,which still lagged behind the level of better food and livelihood security.Specifically,the average values of farmers’evaluation of food security and livelihood security were 1.43 and 1.48,respectively,which show that farmers’food security in the study area was at a medium level and that of livelihood security was relatively good.Simultaneously,the more simple a farmers’economic activities(i.e.,agriculture-oriented economic activities or non-agriculture-oriented economic activities),the worse their food and livelihood security;while the more diversified the economic activities(i.e.,engaged in part-time economic activities),the better the food and livelihood security.展开更多
文摘Fast growth of mobile internet and internet-of-things has propelled the concept formation and research on 5G wireless communications systems which are to be standardized around 2020(IMT-2020).There will be diverse application scenarios expected for 5G networks.Hence,key performance indicators(KPIs) of 5G systems would be very diverse,not just the peak data rate and average/edge spectral efficiency requirements as in previous generations.For each typical scenario,multiple technologies may be used independently or jointly to improve the transmission efficiency,to lower the cost,and to increase the number of connections,etc.Key enabling technologies are discussed which include massive MIMO,ultradense deployment specific techniques,nonorthogonal transmission,high frequency communications,etc.
文摘怀集县劳动保障局负责同志接受本刊专访,就发展劳务经济、打造怀集劳务品牌这一主题回答了本刊记者提问。创业者:打造怀集劳务这块品牌的着力点在哪里?负责同志:树立良好的品牌,是今后的努力方向,我县将从抓培训,促输出,促就业,建立健全劳务服务平台,完善网络信息建设,实现有组织有序输出,以打造“怀集劳务品牌”。创业者:从统计数字来看,40%的外出农村劳动力才创造了10%的地方社会总产值(最好能解释一下社会总产值这个指标概念,为何不用 GDP
基金The National Natural Science Foundation of China (42001249)。
文摘Based on the basic selection criteria of Globally Important Agricultural Heritage Systems(GIAHS)and food and livelihood security research trends,this paper established an evaluation framework and indicator system for food and livelihood security in GIAHS and selected the first GIAHS site in the Qinghai-Tibet Plateau as a case for empirical evaluation.The results demonstrate that the food and livelihood security of farmers at this site was at a medium level,with an average evaluation value of 2.91,which still lagged behind the level of better food and livelihood security.Specifically,the average values of farmers’evaluation of food security and livelihood security were 1.43 and 1.48,respectively,which show that farmers’food security in the study area was at a medium level and that of livelihood security was relatively good.Simultaneously,the more simple a farmers’economic activities(i.e.,agriculture-oriented economic activities or non-agriculture-oriented economic activities),the worse their food and livelihood security;while the more diversified the economic activities(i.e.,engaged in part-time economic activities),the better the food and livelihood security.
