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
鉴于科技的进步和实验经验,ISO/TC 209出台ISO14644-1:2015《按粒子浓度划出空气洁净度等级》Classification of air cleanliness by particle concentration比ISO14644-1:1999《空气洁净度等级》Classification of air cleanliness技...鉴于科技的进步和实验经验,ISO/TC 209出台ISO14644-1:2015《按粒子浓度划出空气洁净度等级》Classification of air cleanliness by particle concentration比ISO14644-1:1999《空气洁净度等级》Classification of air cleanliness技术概念更清晰,使用更方便;实事求是,更赋灵活性:分级表中,所有浓度值都是累积,包括所有大于等于关注粒径(Considered particle size)的粒子的最大允许浓度值(Maximun allowable concentration siae),浓度限值。区域粒子浓度太高,浓度限值不适用;或者由于低浓度时采样和统计方法的局限性区域分级不适用。按统计学技术概念,决定检测洁净度最少采样点数N_(L);N_(L)值与洁净度无直接关联。作为标准应用的补充,超净环境检测需关注超高过滤器滤材最易穿透粒径MPPS,Most penetrating particle size。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。
文摘鉴于科技的进步和实验经验,ISO/TC 209出台ISO14644-1:2015《按粒子浓度划出空气洁净度等级》Classification of air cleanliness by particle concentration比ISO14644-1:1999《空气洁净度等级》Classification of air cleanliness技术概念更清晰,使用更方便;实事求是,更赋灵活性:分级表中,所有浓度值都是累积,包括所有大于等于关注粒径(Considered particle size)的粒子的最大允许浓度值(Maximun allowable concentration siae),浓度限值。区域粒子浓度太高,浓度限值不适用;或者由于低浓度时采样和统计方法的局限性区域分级不适用。按统计学技术概念,决定检测洁净度最少采样点数N_(L);N_(L)值与洁净度无直接关联。作为标准应用的补充,超净环境检测需关注超高过滤器滤材最易穿透粒径MPPS,Most penetrating particle size。
