We present a simple system of RoF communication based on electronic-optical frequency modulation(EO-FM) in the article. Optical system soflware-Optisystem5.0 was adopted. The results of software simulation showe tha...We present a simple system of RoF communication based on electronic-optical frequency modulation(EO-FM) in the article. Optical system soflware-Optisystem5.0 was adopted. The results of software simulation showe that the simplex - directional 5 Gbit/s data and UHF microwave of 24 GHz were successfully transmitted over 15 km single mode fiber with 0dBm transmitted power, dispersion is 17 ps/nm/km, attenuation is 0.25 dB/km.展开更多
交互学习广泛存在于二语习得(Second Language Acquisition,SLA)的过程中,在网络时代多媒体教学盛行的今天,基于开放式多媒体的网络交互模式概念还存在着模糊,以所在学校为案例,探索二语习得中,基于开放式多媒体的网络交互模式的计算机...交互学习广泛存在于二语习得(Second Language Acquisition,SLA)的过程中,在网络时代多媒体教学盛行的今天,基于开放式多媒体的网络交互模式概念还存在着模糊,以所在学校为案例,探索二语习得中,基于开放式多媒体的网络交互模式的计算机技术实现,以具体的FMS(Flash Media Server3.5)网络交互教学系统来实现师生交互互动,并对系统效果进行评价,探索学生与网络开放资源,学生与教师,学生与学生之间交互活动,结果表明这一模式广受学生支持,高校二语习得教学可尝试推广这一模式,在实践中进行完善。展开更多
文摘We present a simple system of RoF communication based on electronic-optical frequency modulation(EO-FM) in the article. Optical system soflware-Optisystem5.0 was adopted. The results of software simulation showe that the simplex - directional 5 Gbit/s data and UHF microwave of 24 GHz were successfully transmitted over 15 km single mode fiber with 0dBm transmitted power, dispersion is 17 ps/nm/km, attenuation is 0.25 dB/km.
文摘交互学习广泛存在于二语习得(Second Language Acquisition,SLA)的过程中,在网络时代多媒体教学盛行的今天,基于开放式多媒体的网络交互模式概念还存在着模糊,以所在学校为案例,探索二语习得中,基于开放式多媒体的网络交互模式的计算机技术实现,以具体的FMS(Flash Media Server3.5)网络交互教学系统来实现师生交互互动,并对系统效果进行评价,探索学生与网络开放资源,学生与教师,学生与学生之间交互活动,结果表明这一模式广受学生支持,高校二语习得教学可尝试推广这一模式,在实践中进行完善。