面向离散分布的海量电力业务终端的接入需求,灵活可靠的接入技术是实现电力业务泛在物联、信息高效的关键。针对现有无线接入终端接口单一、种类繁多、难以满足电力规范等问题,文章提出一种LTE(long term evolution)230电力终端无缝透...面向离散分布的海量电力业务终端的接入需求,灵活可靠的接入技术是实现电力业务泛在物联、信息高效的关键。针对现有无线接入终端接口单一、种类繁多、难以满足电力规范等问题,文章提出一种LTE(long term evolution)230电力终端无缝透传接入技术,目的在于搭建电力业务终端至主站系统之间的通信桥梁。该技术采用LTE230无线通信模组,实现通信底层技术与电力业务的融合,把业务数据封装为无线帧以透传的方式发送至其他网元,为电力业务定制开发,兼容多种业务通道接口,可扩展性强,业务应用广泛。结合电力无线专网工程应用场景,验证了该接入技术的时效性及准确率等指标均可满足电力业务需求。展开更多
We present a grating model of two-dimensional （2D） rigorous coupled wave analysis （RCWA） to study top diffraction gratings on light-emitting diodes （LEDs）. We compare the integrated-transmission of the non-grati...We present a grating model of two-dimensional （2D） rigorous coupled wave analysis （RCWA） to study top diffraction gratings on light-emitting diodes （LEDs）. We compare the integrated-transmission of the non-grating, rectangular-grating, and triangular-grating cases for the same grating period of 6 μm, and show that the triangular grating has the best performance. For the triangular grating with 6-μm period, the LED achieves the highest light transmission at 6-μm grating bottom width and 2.9-μm grating depth. Compared with the non-grating case, the optimized light transmission improvement is about 74.6%. The simulation agrees with the experimental data of the thin polymer grating encapsulated flip-chip （FC） GaN-based LEDs for the light extraction improvement.展开更多
本文针对物联网领域内窄带物联网通信传输系统和低功耗电池供电场景,介绍了一种基于NB-IoT(Narrow Band Internet of Things)的低功耗透传模块的设计。该模块通过一个stm32单片机控制,使用NB-IoT无线通信方式,具备超低功耗的特点,同时...本文针对物联网领域内窄带物联网通信传输系统和低功耗电池供电场景,介绍了一种基于NB-IoT(Narrow Band Internet of Things)的低功耗透传模块的设计。该模块通过一个stm32单片机控制,使用NB-IoT无线通信方式,具备超低功耗的特点,同时可实现串口设备与网络服务器之间的数据双向透明传输。展开更多
文摘面向离散分布的海量电力业务终端的接入需求,灵活可靠的接入技术是实现电力业务泛在物联、信息高效的关键。针对现有无线接入终端接口单一、种类繁多、难以满足电力规范等问题,文章提出一种LTE(long term evolution)230电力终端无缝透传接入技术,目的在于搭建电力业务终端至主站系统之间的通信桥梁。该技术采用LTE230无线通信模组,实现通信底层技术与电力业务的融合,把业务数据封装为无线帧以透传的方式发送至其他网元,为电力业务定制开发,兼容多种业务通道接口,可扩展性强,业务应用广泛。结合电力无线专网工程应用场景,验证了该接入技术的时效性及准确率等指标均可满足电力业务需求。
基金the Department of the Navy,Office of Naval Research,under Award # N00014-07-1-1152,USAthe"Chunhui"Exchange Research Fellow 2008,Ministry of Education of China,the National"973"Program of China(No.2007CB307004)+1 种基金the National"863"Program of China(No.2006AA03A113)and the National Natural Science Foundation of China(No.60276032,60577030,and 60607003)
文摘We present a grating model of two-dimensional （2D） rigorous coupled wave analysis （RCWA） to study top diffraction gratings on light-emitting diodes （LEDs）. We compare the integrated-transmission of the non-grating, rectangular-grating, and triangular-grating cases for the same grating period of 6 μm, and show that the triangular grating has the best performance. For the triangular grating with 6-μm period, the LED achieves the highest light transmission at 6-μm grating bottom width and 2.9-μm grating depth. Compared with the non-grating case, the optimized light transmission improvement is about 74.6%. The simulation agrees with the experimental data of the thin polymer grating encapsulated flip-chip （FC） GaN-based LEDs for the light extraction improvement.
文摘本文针对物联网领域内窄带物联网通信传输系统和低功耗电池供电场景,介绍了一种基于NB-IoT(Narrow Band Internet of Things)的低功耗透传模块的设计。该模块通过一个stm32单片机控制,使用NB-IoT无线通信方式,具备超低功耗的特点,同时可实现串口设备与网络服务器之间的数据双向透明传输。
