高压隔离开关智能组件硬件系统的抗电磁干扰策略

高压隔离开关智能组件是变电站智能一次设备的关键部件,但嵌入在一次设备中运行的智能组件电磁环境恶劣,可能导致隔离开关智能组件的误操作.为了提高智能组件的抗干扰能力,本文提出了改进硬件平台系统抗电磁干扰的设计理念.对智能组件系统所处的电磁干扰环境,电磁干扰源、抗电磁干扰机理做了详细分析,研究了设计电磁兼容性问题,总结出了智能组件系统硬件设计中应采取的抑制电磁干扰措施.通过对设计的硬件系统进行现场测试,试验效果验证了硬件系统抗干扰策略的可行性和有效性.     

Investigation on inter-modulation products (IMPs) for IM-DD SCM optical links

The implementation of the subcarrier multiplexing (SCM) as the signaling format has been extensively researched in various analog and digital lightwave based broadband applications because of its promising versatility, cost effectiveness, convenient and simple offerings. However performance degradation is a matter of serious concern in such multi-channel intensity modulation-direct detection (IM-DD) systems caused by inter-modulation distortion (IMD) mechanism. In this paper the impact of key operational and physical parameters of a laser source on an IMD dominated two-tone IM-DD SCM system has been investigated which can thereby be exploited favorably to develop a reasonably IMD immune optical link.     

智慧广电传播领域关键技术研究

构建高速、泛在、智慧、安全的智慧内容传播体系是新时代智慧广电建设的关键环节.智慧内容传播体系的建立,有助于推进广电网络服务品质的升级,实现广电智慧内容传播的规范化、便捷化和智能化,为新时代下广电网络转型升级注入新动力.本文在研究分析智慧内容传播体系应具备能力的基础上,探讨了实现高质量智慧传输网络服务的实施路径.     

The promises of iDTV: Between push marketing and consumer needs

In this article, we discuss the push and pull dynamics of the introduction of interactive digital television and the discrepancy between promised and actual practices as experienced by the audience. Our analysis is based on a case study of iDTV in Flanders in which we analysed both the promises found in the political economical rhetoric about iDTV and the lived appropriation practices of viewers with their motives to switch or not to switch to interactive digital television. For viewers that have made the switch, we found there are different arguments that led them to choose for iDTV. Furthermore, it is not only the question “Will I switch”, but also the selection for a specific platform provider that is sometimes an issue. Next to these considerations of users, we find it equally important to look at the non-users and their hesitations or motivations not to switch. The findings show how the place and signification of a media technology like iDTV in economy and society is the result of an interplay between political and economic push factors and the lived practices and pull dynamics by users.     

基于MTK平台的智能家居控制网络系统

针对MTK芯片的高性价比和可二次开发的特性,开发了基于MTK平台的智能家居控制网络系统,通过对MTK手机软件系统的修改,以及对家用电器接口电路的设计,实现了智能家居控制网络系统的基本功能,通过MTK平台丰富的GPIO（General Purpose Input Output）口,可以挂载数十种家电和监控设备,该系统调试...     

基于认知无线电的OFDM智能侦察监测系统

自适应正交频分复用(OFDM)技术在军事和民用通信领域中都具有广泛的应用。重点研究认知无线电技术在智能侦察监测系统中的应用,建立基于认知无线电的OFDM信号智能侦察监测接收系统模型,结合系统需求和实现可能性,搭建基于软件无线电技术(SDR)的智能侦察监测系统,并分析系统构建的合理性、技术的有效性,为将来的工程实践打下基础。     

基于光电传感器的智能车自动寻迹系统设计

介绍了一种自主寻迹智能车的设计,研究了采用红外反射式光电传感器作为路径采集模块实现自动寻迹的软硬件设计方法.系统采用Freescale16位单片机MC9S12DG128为核心控制器,利用11个红外光电传感器构成的光电传感器阵列采集路面信息,单片机获得传感器采集的路面信息和车速信息,经过分析后控制智能车的舵机转向,同时对直流电机进行调速,从而实现智能车沿给定的黑线快速平稳的行驶.该文介绍了光电传感器的寻迹原理,讨论了光电传感器排列方法、布局、间隔等对寻迹结果的影响.     

基于粒子群算法的软件可靠性分配问题研究

针对软件可靠性分配中不易求解全局最优解这一问题,将可靠性指标分配到每个模块中,并利用改进的粒子群优化算法来搜索模型的最优解.实验结果表明,改进的粒子群优化算法在求解软件可靠性分配问题时的效果优于遗传算法等其他智能优化算法.     

广播电台主控音频网络系统设计与实现

主控音频网络系统在广播音频体系中具有重要的作用.分析了主控音频网络系统的功能和组成,详细研究了矩阵系统和智监音频网络系统的设计和构建.最后,给出了一个主控音频网络系统的设计实例,包括硬件的选择和系统的搭建.     

数字电视传输技术新进展及展望

从世界范围来讲,广电频谱的低利用率正面临着频谱被收回分配给其他行业的危险.从技术层面,利用最新的数字通信理论开发高频谱利用率的传输技术;从业务层面,培育一些具有杀手级应用的新业务.总结了世界上具有影响力的两大数字电视标准化组织DVB和ATSC的最新发展,这些技术进步正是沿着上述方向前进.这对于我国数字电视的演进是一个很好的参考.