传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求。针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略...传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求。针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略。首先,该方案提出协同上下行链路(Uplink and Downlink Collaboration,UADC)的资源分配算法,并构建了以最大化系统总效率为目标的非线性规划问题。然后,将该问题分为最佳功率选择和信道分配2个子问题,同时利用匈牙利算法为D2D对选择最佳信道。最后,在MATLAB仿真平台进行实验。仿真结果表明,相比于仅复用上行链路的和仅使用DAS系统的方法,所提方案的频谱效率更高。展开更多
针对物联网工程中关键技术M2M(Machine to machine,M2M)的研究,从M2M的基本概念、系统架构和通信网络优化等方面进行了详细阐述,并根据ESTI TC标准用例驱动分析法,通过用例模板对电子健康-隔离干扰的M2M应用进行了研究。结果表明:作为...针对物联网工程中关键技术M2M(Machine to machine,M2M)的研究,从M2M的基本概念、系统架构和通信网络优化等方面进行了详细阐述,并根据ESTI TC标准用例驱动分析法,通过用例模板对电子健康-隔离干扰的M2M应用进行了研究。结果表明:作为物联网工程专业重要支撑技术,M2M技术的核心是通信,其通信网络在整个M2M技术框架中处于核心地位,最终目标是实现网络一切。展开更多
通过分析物联网技术在连续装卸系统智能化、装卸船机系统智能化、煤炭输送系统智能化中的应用,说明物联网是如何使物料搬运系统智能化的,并分析了未来智能化物料搬运系统的发展需要云计算、人工智能、M2M(Machine to Machine)技术与物...通过分析物联网技术在连续装卸系统智能化、装卸船机系统智能化、煤炭输送系统智能化中的应用,说明物联网是如何使物料搬运系统智能化的,并分析了未来智能化物料搬运系统的发展需要云计算、人工智能、M2M(Machine to Machine)技术与物联网技术的结合,才能使智能化物料搬运系统变得更加智能化、自主性、耐用和可靠。展开更多
Electron backscatter diffraction(EBSD) is a superior technique for twin characterisation due to its ability to provide highly detailed classification(by generation,system and variant) of a significant number of twins ...Electron backscatter diffraction(EBSD) is a superior technique for twin characterisation due to its ability to provide highly detailed classification(by generation,system and variant) of a significant number of twins in a relatively short time.2D EBSD is now widely used for twin characterisation and provides quite good estimates of twin volume fractions under many conditions.Nevertheless,its accuracy is limited by assumptions that have to be made due to the 2D nature of the technique.With 3D EBSD,two key assumptions are no longer required,as additional information can be derived from the 3D map.This paper compares the benefits and limitations of 2D and 3D EBSD for twin characterisation.2D EBSD enables a larger number of twins to be mapped in a given space of time,giving better statistics.3D EBSD provides more comprehensive twin characterisation and will be a valuable tool for validation of 2D stereological methods and microstructural models of twinning during deformation.展开更多
文摘传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求。针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略。首先,该方案提出协同上下行链路(Uplink and Downlink Collaboration,UADC)的资源分配算法,并构建了以最大化系统总效率为目标的非线性规划问题。然后,将该问题分为最佳功率选择和信道分配2个子问题,同时利用匈牙利算法为D2D对选择最佳信道。最后,在MATLAB仿真平台进行实验。仿真结果表明,相比于仅复用上行链路的和仅使用DAS系统的方法,所提方案的频谱效率更高。
文摘针对物联网工程中关键技术M2M(Machine to machine,M2M)的研究,从M2M的基本概念、系统架构和通信网络优化等方面进行了详细阐述,并根据ESTI TC标准用例驱动分析法,通过用例模板对电子健康-隔离干扰的M2M应用进行了研究。结果表明:作为物联网工程专业重要支撑技术,M2M技术的核心是通信,其通信网络在整个M2M技术框架中处于核心地位,最终目标是实现网络一切。
文摘通过分析物联网技术在连续装卸系统智能化、装卸船机系统智能化、煤炭输送系统智能化中的应用,说明物联网是如何使物料搬运系统智能化的,并分析了未来智能化物料搬运系统的发展需要云计算、人工智能、M2M(Machine to Machine)技术与物联网技术的结合,才能使智能化物料搬运系统变得更加智能化、自主性、耐用和可靠。
文摘Electron backscatter diffraction(EBSD) is a superior technique for twin characterisation due to its ability to provide highly detailed classification(by generation,system and variant) of a significant number of twins in a relatively short time.2D EBSD is now widely used for twin characterisation and provides quite good estimates of twin volume fractions under many conditions.Nevertheless,its accuracy is limited by assumptions that have to be made due to the 2D nature of the technique.With 3D EBSD,two key assumptions are no longer required,as additional information can be derived from the 3D map.This paper compares the benefits and limitations of 2D and 3D EBSD for twin characterisation.2D EBSD enables a larger number of twins to be mapped in a given space of time,giving better statistics.3D EBSD provides more comprehensive twin characterisation and will be a valuable tool for validation of 2D stereological methods and microstructural models of twinning during deformation.
