A Reliable Adaptive High-Definition Transmission System for Distance Learning

There is an increasing demand for supporting high-quality real-time audiovisual services for the next generation wired and wireless networks. However, due to variety of bandwidths of different networks, it is a great challenge for deployment. In this paper, a novel high-definition (HD) video transmission system was proposed which depends upon reliable compound multicast protocols and QoS control over the various kinds of networks. This system detects client's network condition and assigns it to a proper proxy. Each proxy is capable of detecting network parameters and adaptively tuning such transport parameters as bit rate, video resolution, frame rate and QoS mechanisms to this condition. It also provides FEC error recovery under consideration of characteristics of MPEG4 video codec. Our simulation demonstrates that different network clients such as ADSL, CERNET, and CERNET2 can receive more video reliability with less delay.     

超静定Γ型刚架的置换原理解答

介绍多种梁的挠曲线与其置换梁的挠曲线的关系研究,给出了求解各梁位移的置换法转角方程和置换原理中的转角连续性关系．鉴于对Г型刚架的求解中稀有几何类方法的情况,运用所述的置换法和置换原理,把解梁问题的手段应用于该型刚架的解算．策划、归纳了求该型超静定刚架不同约束类型时的步骤．具体求解过程所用的计算为代数方程的分式四则运算,方法较通俗简便,结果是解析解．     

LabVIEW在电站监控系统中的应用

主要研究了LabVIEW在电站监控系统中的应用;通过基于MODBUS协议的串口网络将船舶电站各发电机组及柴油机的信息存储到监控系统数据库,利用QUEUE技术解决了串口通讯的实时性问题;同时根据数据处理结果对相应发电机组执行操作,实时显示各机组的状态信息,进一步提高了船舶电站自动化的水平。     

不间断运营的地下通道改扩建技术研究

以浦东机场进场路地道改建工程为例，重点对为满足地下道路不间断运营工况的地道结构进行受力分析及施工步序研究。解决了传统地下通道改扩建工程需要封闭地下道路交通的难题，即整个施工期间地下交通仍能不间断运营。方案在国内尚属首例，具有标志性意义。     

新十八大街快速路总体方案分析研究

快速路的修建能较好地改善城市的交通出行条件，其总体设计方案等前期研究工作非常重要，对快速路建成后的城市交通运行状况及区域社会经济发展影响巨大。对信阳市首条高架快速路总体方案进行了详细研究，针对项目的特殊地貌条件及环境限制，从功能定位、设计原则、建设规模及标准、建设形式、交通转换及匝道布设、总体布置方案及节点方案等方面进行了分析研究。项目运行后极大地改善了信阳市新老城区的交通出行条件，社会反响良好，综合效益十分显著。