The construction method of background value is improved in the original multi-variable grey model （MGM（1,m）） from its source of construction errors. The MGM（1,m） with optimized background value is used to elimin...The construction method of background value is improved in the original multi-variable grey model （MGM（1,m）） from its source of construction errors. The MGM（1,m） with optimized background value is used to eliminate the random fluctuations or errors of the observational data of all variables, and the combined prediction model together with the multiple linear regression is established in order to improve the simulation and prediction accuracy of the combined model. Finally, a combined model of the MGM（1,2） with optimized background value and the binary linear regression is constructed by an example. The results show that the model has good effects for simulation and prediction.展开更多
为满足监控领域摄像头驱动替换便捷性和快速开发的需求,基于AR9311芯心在Linux系统上设计了一种网络摄像头。该系统采用媒体处理软件平台(MPP)进行设计,摄像头驱动以应用层驱动库的方式进行调用,应用软件通过MPP提供的接口快速完成相关...为满足监控领域摄像头驱动替换便捷性和快速开发的需求,基于AR9311芯心在Linux系统上设计了一种网络摄像头。该系统采用媒体处理软件平台(MPP)进行设计,摄像头驱动以应用层驱动库的方式进行调用,应用软件通过MPP提供的接口快速完成相关功能开发。文中以GC_2053摄像头为例,介绍了其在MPP架构下应用层驱动的设计,重点分析了如何通过VI视频采集模块获取视频图像,通过VPSS视频处理子系统模块处理图像,通过VENC编码模块进行编码输出码流。通过RTSP协议进行网络传输,通过解码软件VLC media player进行播放。经过测试,视频传输稳定,图像显示清晰,能够满足监控领域的要求。展开更多
基金supported by the National Natural Science Foundation of China(71071077)the Ministry of Education Key Project of National Educational Science Planning(DFA090215)+1 种基金China Postdoctoral Science Foundation(20100481137)Funding of Jiangsu Innovation Program for Graduate Education(CXZZ11-0226)
文摘The construction method of background value is improved in the original multi-variable grey model （MGM（1,m）） from its source of construction errors. The MGM（1,m） with optimized background value is used to eliminate the random fluctuations or errors of the observational data of all variables, and the combined prediction model together with the multiple linear regression is established in order to improve the simulation and prediction accuracy of the combined model. Finally, a combined model of the MGM（1,2） with optimized background value and the binary linear regression is constructed by an example. The results show that the model has good effects for simulation and prediction.
文摘为有效预测船舶油耗,提出一种基于混合核函数的船舶油耗预测模型。分别构建径向基函数(radial basis function,RBF)和多项式单核函数的支持向量回归(support vector regression,SVR)模型,并利用自适应随机搜索(adaptive random search,ARS)算法对两者进行优化。在此基础上,建立基于混合核函数ARS-SVR的船舶油耗预测模型。以一艘风帆助航的大型原油运输船(very large crude carrier,VLCC)为研究对象,基于实船监测数据开展船舶油耗预测。结果表明,与单一的RBF和多项式单核ARS-SVR相比,采用混合核函数ARS-SVR的模型的预测结果的均方根误差分别降低了19.8%和30.2%。所提出的船舶油耗预测模型可以提升风帆助航船油耗计算的准确率,有助于优化船舶能效和提升管理技术。
文摘为满足监控领域摄像头驱动替换便捷性和快速开发的需求,基于AR9311芯心在Linux系统上设计了一种网络摄像头。该系统采用媒体处理软件平台(MPP)进行设计,摄像头驱动以应用层驱动库的方式进行调用,应用软件通过MPP提供的接口快速完成相关功能开发。文中以GC_2053摄像头为例,介绍了其在MPP架构下应用层驱动的设计,重点分析了如何通过VI视频采集模块获取视频图像,通过VPSS视频处理子系统模块处理图像,通过VENC编码模块进行编码输出码流。通过RTSP协议进行网络传输,通过解码软件VLC media player进行播放。经过测试,视频传输稳定,图像显示清晰,能够满足监控领域的要求。
