MPPS sampling design is a kind of new method that was deVeloped by National Agricultural Statistics Service of Agricultural Department in the U.S.A.at the end of last century. Some ideas about the improvement of the v...MPPS sampling design is a kind of new method that was deVeloped by National Agricultural Statistics Service of Agricultural Department in the U.S.A.at the end of last century. Some ideas about the improvement of the variance estimator of MPPS design are proposed in this paper.The model has been simulated with the data of the First Agricultural Census in China.展开更多
In view of the structure and action behavior of mechatronic systems,a method of searching fault propagation paths called maximum-probability path search(MPPS)is proposed,aiming to determine all possible failure propag...In view of the structure and action behavior of mechatronic systems,a method of searching fault propagation paths called maximum-probability path search(MPPS)is proposed,aiming to determine all possible failure propagation paths with their lengths if faults occur.First,the physical structure system,function behavior,and complex network theory are integrated to define a system structural-action network(SSAN).Second,based on the concept of SSAN,two properties of nodes and edges,i.e.,the topological property and reliability property,are combined to define the failure propagation property.Third,the proposed MPPS model provides all fault propagation paths and possible failure rates of nodes on these paths.Finally,numerical experiments have been implemented to show the accuracy and advancement compared with the methods of Function Space Iteration(FSI)and the algorithm of Ant Colony Optimization(ACO).展开更多
Abstract Using 1995 results from the NASA Parallel Benchmarks, this paper compares the sustained performance (as opposed to peak performance) and cost per unit of sustained performance for state-of-the--art Parallel p...Abstract Using 1995 results from the NASA Parallel Benchmarks, this paper compares the sustained performance (as opposed to peak performance) and cost per unit of sustained performance for state-of-the--art Parallel processing systems that use MicroProcessors(MPP) versus those that use Custom-designed Processors (PVP). This comparison shows that MPPs approach, but seldom surpass, PCPs with respect to either metric. This paper also discusses the merits and demerits of 'clusters' of workstations Ironically, recently introduced low--cost, parallel systems can also be viewed as 'virtual workstation clusters' that offer comparable, if not superior, capabilitics. Finally, this paper explores the question of whether it will be economically feasible for computer manut'acturers to continue building PVPs, or are MPPs the only economically viable option for building parallel systems?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
针对传统抽样调查工作中调查基础资料时效性不高和野外调查工作量较大等问题,该文提出了一种遥感与MPPS(multivariate probability proportional to size)抽样调查相结合的农作物种植面积测量方法。利用第2次农业普查数据进行抽样框的编...针对传统抽样调查工作中调查基础资料时效性不高和野外调查工作量较大等问题,该文提出了一种遥感与MPPS(multivariate probability proportional to size)抽样调查相结合的农作物种植面积测量方法。利用第2次农业普查数据进行抽样框的编制;利用时序中分辨率遥感数据进行农作物种植面积的分类;在中分辨率遥感分类图的基础上进行MPPS抽样;采用高空间分辨率遥感数据对抽选样本进行面向对象的分类;根据MPPS抽样方法进行总体农作物种植面积的推断;计算CV值,评价抽样精度,以国家统计局公布数据为标准进行总体面积精度评价。以辽宁省北镇市为研究区对该方法进行了测试。结果显示,该方法能够有效的提取县级农作物种植面积,农作物种植面积提取精度优于92%。展开更多
文摘MPPS sampling design is a kind of new method that was deVeloped by National Agricultural Statistics Service of Agricultural Department in the U.S.A.at the end of last century. Some ideas about the improvement of the variance estimator of MPPS design are proposed in this paper.The model has been simulated with the data of the First Agricultural Census in China.
基金Project(2017JBZ103)supported by the Fundamental Research Funds for the Central Universities,China
文摘In view of the structure and action behavior of mechatronic systems,a method of searching fault propagation paths called maximum-probability path search(MPPS)is proposed,aiming to determine all possible failure propagation paths with their lengths if faults occur.First,the physical structure system,function behavior,and complex network theory are integrated to define a system structural-action network(SSAN).Second,based on the concept of SSAN,two properties of nodes and edges,i.e.,the topological property and reliability property,are combined to define the failure propagation property.Third,the proposed MPPS model provides all fault propagation paths and possible failure rates of nodes on these paths.Finally,numerical experiments have been implemented to show the accuracy and advancement compared with the methods of Function Space Iteration(FSI)and the algorithm of Ant Colony Optimization(ACO).
文摘Abstract Using 1995 results from the NASA Parallel Benchmarks, this paper compares the sustained performance (as opposed to peak performance) and cost per unit of sustained performance for state-of-the--art Parallel processing systems that use MicroProcessors(MPP) versus those that use Custom-designed Processors (PVP). This comparison shows that MPPs approach, but seldom surpass, PCPs with respect to either metric. This paper also discusses the merits and demerits of 'clusters' of workstations Ironically, recently introduced low--cost, parallel systems can also be viewed as 'virtual workstation clusters' that offer comparable, if not superior, capabilitics. Finally, this paper explores the question of whether it will be economically feasible for computer manut'acturers to continue building PVPs, or are MPPs the only economically viable option for building parallel systems?
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。
文摘针对传统抽样调查工作中调查基础资料时效性不高和野外调查工作量较大等问题,该文提出了一种遥感与MPPS(multivariate probability proportional to size)抽样调查相结合的农作物种植面积测量方法。利用第2次农业普查数据进行抽样框的编制;利用时序中分辨率遥感数据进行农作物种植面积的分类;在中分辨率遥感分类图的基础上进行MPPS抽样;采用高空间分辨率遥感数据对抽选样本进行面向对象的分类;根据MPPS抽样方法进行总体农作物种植面积的推断;计算CV值,评价抽样精度,以国家统计局公布数据为标准进行总体面积精度评价。以辽宁省北镇市为研究区对该方法进行了测试。结果显示,该方法能够有效的提取县级农作物种植面积,农作物种植面积提取精度优于92%。
