利用第二次全国土壤调查土壤质地数据（SNSS）和中国区域陆地覆盖资料（CLCV）将陆面过程模式CLM3.5（Community Land Model version 3.5）中基于联合国粮食农业组织发展的土壤质地数据（FAO）和MODIS卫星反演的陆地覆盖数据（MODIS）...利用第二次全国土壤调查土壤质地数据（SNSS）和中国区域陆地覆盖资料（CLCV）将陆面过程模式CLM3.5（Community Land Model version 3.5）中基于联合国粮食农业组织发展的土壤质地数据（FAO）和MODIS卫星反演的陆地覆盖数据（MODIS）进行了替换,使用中国气象局陆面数据同化系统（CMA Land Data Assimilation System,CLDAS）大气强迫场资料,分别驱动基于同时改进土壤质地和陆地覆盖数据的CLM3.5（CLM-new）、基于只改进陆地覆盖数据的CLM3.5（CLM-clcv）、基于只改进土壤质地数据的CLM3.5（CLM-snss）和基于原始下垫面数据的CLM3.5（CLM-ctl）,对内蒙古地区2011~2013年土壤湿度的时空变化进行模拟试验,研究下垫面改进对CLM3.5模拟土壤湿度的影响。将四组模拟结果与46个土壤水分站点观测数据进行对比分析,结果表明：相对于控制试验,CLM-clcv、CLM-snss和CLM-new都能不同程度地改进土壤湿度模拟,其中CLM-clcv主要在呼伦贝尔改进明显,CLM-snss则在除呼伦贝尔以外的大部地区改进显著,CLM-ctl模拟的土壤湿度在各层上均系统性偏大,而CLM-new模拟土壤湿度最好地反映出内蒙古地区观测的土壤湿度的时空变化特征,显著改善了土壤湿度的模拟,体现在与观测值有着更高的相关系数和更小的平均偏差与均方根误差。展开更多
文章利用TRMM(Tropical Rainfall Measuring)卫星TMI(TRMM Microwave Imager)探测反演的云水、雨水和冰水新版改进资料,定量化检验了WRF(Weather Research and Forecasting)模式6种微物理方案(Lin,WSM6,Thompson,Morrison 2-mom,CAM5.1,...文章利用TRMM(Tropical Rainfall Measuring)卫星TMI(TRMM Microwave Imager)探测反演的云水、雨水和冰水新版改进资料,定量化检验了WRF(Weather Research and Forecasting)模式6种微物理方案(Lin,WSM6,Thompson,Morrison 2-mom,CAM5.1,NSSL 2-mom)对江苏近海及周边海域上空云中水凝物的预报能力。19次个例统计检验结果表明,6种微物理方案基本都能预报出水凝物的量级及大致范围,对于云水的预报,除NSSL2-mom方案误差较大外,其余5种方案误差均较小;CAM5.1方案对雨水含量较大时的预报效果较好,但对于雨水含量较小时的预报误差较大;Lin方案对于冰水的预报效果较好,更接近于实况。在此基础上,选用等权集成(EMN)和消除偏差集成(BREM)两种方法开展集成预报试验,结果发现,两种方法均可以减小预报的误差,且消除偏差集成的方法比等权集成的改进效果更好。展开更多
本文用CORE-IAF(Coordinated Ocean-ice Reference Experiments–Interannual Forcing)外强迫场分别强迫LICOM3(LASG/IAP Climate System Ocean Model Version 3)和POP2(Parallel Ocean Program version 2)两个海洋模式,并分析了这两个...本文用CORE-IAF(Coordinated Ocean-ice Reference Experiments–Interannual Forcing)外强迫场分别强迫LICOM3(LASG/IAP Climate System Ocean Model Version 3)和POP2(Parallel Ocean Program version 2)两个海洋模式,并分析了这两个模式中太平洋北赤道逆流(NECC)的模拟结果。我们发现LICOM3和POP2模拟的NECC强度均弱于实测,这和Sun et al.(2019)的研究结果一致,也进一步证明了海洋模式中NECC偏弱是CORE-IAF外强迫场造成的,海表风应力及对应的风应力旋度是海洋模式准确模拟NECC的最主要因子。同时,我们也分析了NECC的模拟在动力机制上的差别,这里的动力强迫项包括风应力项、平流项和余项。我们发现模式的外强迫场虽然相同,但是两个模式中各动力强迫项(风应力项、平流项和余项)对NECC模拟的影响并不完全相同。展开更多
Eugene Nida’s dynamic equivalence translation theory has become a mainstream in translation theory field, and is found applied in various fields. The paper is to discuss its application in translating foreign film na...Eugene Nida’s dynamic equivalence translation theory has become a mainstream in translation theory field, and is found applied in various fields. The paper is to discuss its application in translating foreign film names.展开更多
针对以太网无源光网络的网络规划和算法研究,在IEEE802.3ah标准的基础上,通过扩展开源网络模拟程序Network Simulator Version 2(NS2),完成对以太网无源光网络(EPON)的建模与测试,实现了光网络单元(ONU)注册、测距、带宽分配、服务质量(...针对以太网无源光网络的网络规划和算法研究,在IEEE802.3ah标准的基础上,通过扩展开源网络模拟程序Network Simulator Version 2(NS2),完成对以太网无源光网络(EPON)的建模与测试,实现了光网络单元(ONU)注册、测距、带宽分配、服务质量(QoS)等诸多功能,为EPON网络规划和算法研究提供了一个全面完整的仿真平台(EPONns).注册过程模拟给出成功注册的ONU数目与注册窗口值的关系;光传输线路终端(OLT)负载状况检测反映出EPONns在高负荷下的状态.展开更多
Authors’ first and last names were interchanged in the original version of the article and they should be replaced as follows: Asghar Rahmati, Lohrasb Faramarzi, Mohammad Darbor.
An object segment similarity function is taken into account from the continuous media frames to measure the individual streaming profit of certain segment versions of a media object.Therefore,a new segment version-bas...An object segment similarity function is taken into account from the continuous media frames to measure the individual streaming profit of certain segment versions of a media object.Therefore,a new segment version-based transcoding(SVT)mechanism is derived for a quality of service(QoS)of client-centric media streaming in wireless mobile networks.The derived function utilizes the fuzzy similarity of certain segment versions of an object.This mechanism provides the effectiveness of reduction of the stream startup latency among segment versions,and the average access of each version.Thus,the proposed segment version transcoding mechanism reduces packet loss which in turn increases streaming performance and throughput.The performance of the partitioned segment versions is simulated and some segment versions are completed.The simulation results show that the proposed mechanism outperforms the other mechanisms in average cache hit ratio and in average startup latency ratio.展开更多
文摘利用第二次全国土壤调查土壤质地数据（SNSS）和中国区域陆地覆盖资料（CLCV）将陆面过程模式CLM3.5（Community Land Model version 3.5）中基于联合国粮食农业组织发展的土壤质地数据（FAO）和MODIS卫星反演的陆地覆盖数据（MODIS）进行了替换,使用中国气象局陆面数据同化系统（CMA Land Data Assimilation System,CLDAS）大气强迫场资料,分别驱动基于同时改进土壤质地和陆地覆盖数据的CLM3.5（CLM-new）、基于只改进陆地覆盖数据的CLM3.5（CLM-clcv）、基于只改进土壤质地数据的CLM3.5（CLM-snss）和基于原始下垫面数据的CLM3.5（CLM-ctl）,对内蒙古地区2011~2013年土壤湿度的时空变化进行模拟试验,研究下垫面改进对CLM3.5模拟土壤湿度的影响。将四组模拟结果与46个土壤水分站点观测数据进行对比分析,结果表明：相对于控制试验,CLM-clcv、CLM-snss和CLM-new都能不同程度地改进土壤湿度模拟,其中CLM-clcv主要在呼伦贝尔改进明显,CLM-snss则在除呼伦贝尔以外的大部地区改进显著,CLM-ctl模拟的土壤湿度在各层上均系统性偏大,而CLM-new模拟土壤湿度最好地反映出内蒙古地区观测的土壤湿度的时空变化特征,显著改善了土壤湿度的模拟,体现在与观测值有着更高的相关系数和更小的平均偏差与均方根误差。
文摘文章利用TRMM(Tropical Rainfall Measuring)卫星TMI(TRMM Microwave Imager)探测反演的云水、雨水和冰水新版改进资料,定量化检验了WRF(Weather Research and Forecasting)模式6种微物理方案(Lin,WSM6,Thompson,Morrison 2-mom,CAM5.1,NSSL 2-mom)对江苏近海及周边海域上空云中水凝物的预报能力。19次个例统计检验结果表明,6种微物理方案基本都能预报出水凝物的量级及大致范围,对于云水的预报,除NSSL2-mom方案误差较大外,其余5种方案误差均较小;CAM5.1方案对雨水含量较大时的预报效果较好,但对于雨水含量较小时的预报误差较大;Lin方案对于冰水的预报效果较好,更接近于实况。在此基础上,选用等权集成(EMN)和消除偏差集成(BREM)两种方法开展集成预报试验,结果发现,两种方法均可以减小预报的误差,且消除偏差集成的方法比等权集成的改进效果更好。
文摘本文用CORE-IAF(Coordinated Ocean-ice Reference Experiments–Interannual Forcing)外强迫场分别强迫LICOM3(LASG/IAP Climate System Ocean Model Version 3)和POP2(Parallel Ocean Program version 2)两个海洋模式,并分析了这两个模式中太平洋北赤道逆流(NECC)的模拟结果。我们发现LICOM3和POP2模拟的NECC强度均弱于实测,这和Sun et al.(2019)的研究结果一致,也进一步证明了海洋模式中NECC偏弱是CORE-IAF外强迫场造成的,海表风应力及对应的风应力旋度是海洋模式准确模拟NECC的最主要因子。同时,我们也分析了NECC的模拟在动力机制上的差别,这里的动力强迫项包括风应力项、平流项和余项。我们发现模式的外强迫场虽然相同,但是两个模式中各动力强迫项(风应力项、平流项和余项)对NECC模拟的影响并不完全相同。
文摘Eugene Nida’s dynamic equivalence translation theory has become a mainstream in translation theory field, and is found applied in various fields. The paper is to discuss its application in translating foreign film names.
文摘针对以太网无源光网络的网络规划和算法研究,在IEEE802.3ah标准的基础上,通过扩展开源网络模拟程序Network Simulator Version 2(NS2),完成对以太网无源光网络(EPON)的建模与测试,实现了光网络单元(ONU)注册、测距、带宽分配、服务质量(QoS)等诸多功能,为EPON网络规划和算法研究提供了一个全面完整的仿真平台(EPONns).注册过程模拟给出成功注册的ONU数目与注册窗口值的关系;光传输线路终端(OLT)负载状况检测反映出EPONns在高负荷下的状态.
文摘Authors’ first and last names were interchanged in the original version of the article and they should be replaced as follows: Asghar Rahmati, Lohrasb Faramarzi, Mohammad Darbor.
基金Project(2011)financially supported by Research Funds of Chonbuk National University,Korea
文摘An object segment similarity function is taken into account from the continuous media frames to measure the individual streaming profit of certain segment versions of a media object.Therefore,a new segment version-based transcoding(SVT)mechanism is derived for a quality of service(QoS)of client-centric media streaming in wireless mobile networks.The derived function utilizes the fuzzy similarity of certain segment versions of an object.This mechanism provides the effectiveness of reduction of the stream startup latency among segment versions,and the average access of each version.Thus,the proposed segment version transcoding mechanism reduces packet loss which in turn increases streaming performance and throughput.The performance of the partitioned segment versions is simulated and some segment versions are completed.The simulation results show that the proposed mechanism outperforms the other mechanisms in average cache hit ratio and in average startup latency ratio.
