The paper discusses the barriers of integration of management systems （IMS）. A model based on process is explored, It is indicated that integrating management systems should not ignore the characteristics of the man...The paper discusses the barriers of integration of management systems （IMS）. A model based on process is explored, It is indicated that integrating management systems should not ignore the characteristics of the management systems, especially scope issues. IMS needs to take into the continuous improvement.展开更多
Health management permits the reliability of a system and plays a increasingly important role for achieving efficient system-level maintenance.It has been used for remaining useful life（RUL） prognostics of electroni...Health management permits the reliability of a system and plays a increasingly important role for achieving efficient system-level maintenance.It has been used for remaining useful life（RUL） prognostics of electronics-rich system including avionics.Prognostics and health management（PHM） have become highly desirable to provide avionics with system level health management.This paper presents a health management and fusion prognostic model for avionics system,combining three baseline prognostic approaches that are model-based,data-driven and knowledge-based approaches,and integrates merits as well as eliminates some limitations of each single approach to achieve fusion prognostics and improved prognostic performance of RUL estimation.A fusion model built upon an optimal linear combination forecast model is then utilized to fuse single prognostic algorithm representing the three baseline approaches correspondingly,and the presented case study shows that the fusion prognostics can provide RUL estimation more accurate and more robust than either algorithm alone.展开更多
Based on the principles of system engineering,economics theory and local conditionof production,studies carried out by taking“quadratic-regression-orthogonal-rotational” and ran-domized complete block designs to det...Based on the principles of system engineering,economics theory and local conditionof production,studies carried out by taking“quadratic-regression-orthogonal-rotational” and ran-domized complete block designs to determine the Optimal Agronomical Practices Package（OAPP）for Wheat Modelized Cultivation Management（WMCM）by system decision-makinganalysis.The OAPP was expected to meet various goals of different levels of yield and economicbenefit of middle and high fertility land in Beijing area.Taking cultivar JINGDONG-1（"JD-1"）asan example,the OAPP for grain yield≥6750 kg/ha and net benefit≥360 US （?）/ha was consist-ed as follows:density=195 plants/m<sup>2</sup>;spring irrigation times=4（stem elongation,booting,flowering,and 20 days after anthesis）;fertilization=150-188 kg N/ha,113-128 kg P<sub>2</sub>O<sub>5</sub>/ha.展开更多
The life cycle of CIMS (Computer Integrated Manufacturing System) includes four phases:requirement analyzing, designing, implementation and running. For reducing the risk of investment and achieving better economic re...The life cycle of CIMS (Computer Integrated Manufacturing System) includes four phases:requirement analyzing, designing, implementation and running. For reducing the risk of investment and achieving better economic results the simulation technique is needed in the above four phases of CIMS life cycle. Under the support of China 863/CIMS plan a series of simulation projects are established. Some of them are finished with succeed and have been used in application. In this paper four simulation projects are introduced.(1) The Integrated Manufacturing Simulation Software (IMSS). It is an integrated platform, based on the discrete event simulation principle. It can be used to analyze and design CIMS, especially FMS; and evaluate the daily production plan.(2) The Advanced Hierarchical Control System Emulator (AHCSE), a software system, based on the finite state machine principle. It can be used to analyze and design of CIMS hicrarchical control system, and check expanded system performance before expanding.(3) The Factory Scheduling Environment (FASE), a software system based on the discrete event simulation principle and artificial intelligence technology. It can be used for shop floor scheduling. (4) The Machining Process Simulator (MPS). It can simulate the machining process of machining center by computer. It can check the correctness of NC code (including interference and confliction) and replace the real machining center to support the simulation environment for shop floor scheduling and controlling. There are three companies and universities joining in these four projects, they are: Tsinghua University,Huazhong University of Technology, Beliing Institute of Computer Application and Simulation.展开更多
Based on the theory of marginal opportunity cost, one kind of green input-output table and models of power company are put forward in this paper. For an appliable purpose, analysis of integrated planning, cost analysi...Based on the theory of marginal opportunity cost, one kind of green input-output table and models of power company are put forward in this paper. For an appliable purpose, analysis of integrated planning, cost analysis, pricing of the power company are also given.展开更多
为保障复杂装备技术状态管理的有效集成和多方协同,实现技术状态管理业务数据的双重有序管控,提出基于领域系统(domain system,DS)的建模架构和设计方法。通过引入基于模式的系统工程(pattern-based system engineering,PBSE)框架,构建...为保障复杂装备技术状态管理的有效集成和多方协同,实现技术状态管理业务数据的双重有序管控,提出基于领域系统(domain system,DS)的建模架构和设计方法。通过引入基于模式的系统工程(pattern-based system engineering,PBSE)框架,构建基于DS的复杂装备技术状态管理基本架构,设计DS元模型、DS模型、DS模式的建模方法,将国防部体系架构元模型(Department of Defense Architecture framework metamodel,DM2)进行复杂装备技术状态管理领域化重组为DS元模型,并通过领域元数据映射为DS模型,使其有序组织为适用于具体装备技术状态管理的DS模式。为验证所提方法的有效性,以运载火箭结构系统多视图物料清单(X bill of material,XBOM)为案例,开展基于DS的技术状态管理应用。结果表明,所提方法可为其技术状态管理提供兼具建模的一致性和可追溯性的实施方案,为复杂装备技术状态管理的领域模型配置提供指导性思路。展开更多
近年来,以Chat GPT为代表的大语言模型(large language model,LLM)技术发展迅速.随着模型参数规模的持续增长,构建和应用大模型对数据存储规模和存储访问效率提出了更高要求,这对传统存储系统带来了严峻挑战.首先分析了大模型在数据准...近年来,以Chat GPT为代表的大语言模型(large language model,LLM)技术发展迅速.随着模型参数规模的持续增长,构建和应用大模型对数据存储规模和存储访问效率提出了更高要求,这对传统存储系统带来了严峻挑战.首先分析了大模型在数据准备、模型训练和推理阶段的存储访问特征,深入探讨了传统存储系统在大模型场景下面临的主要问题和瓶颈.针对这些挑战,提出并实现了一种高性能、可扩展的分布式元数据设计Scale FS.通过目录树元数据与属性元数据解耦的架构设计,并结合深度与广度均衡的目录树分层分区策略设计,Scale FS实现了高效的路径解析、负载均衡和系统扩展能力,能够高效管理千亿级文件.此外,Scale FS设计了细粒度元数据结构,优化了元数据访问模式,并构建了面向文件语义优化的元数据键值存储底座,显著提升了元数据访问效率并减少了磁盘I/O操作.实验结果表明,Scale FS的每秒操作次数(operations per second,OPS)是HDFS的1.04~7.12倍,而延迟仅为HDFS的12.67%~99.55%.在千亿级文件规模下,Scale FS的大部分操作性能优于HDFS在十亿级文件规模下的表现,展现出更高的扩展性和访问效率,能够更好地满足大模型场景对千亿级文件存储及高效访问的需求.展开更多
文章考虑车流密度对车速预测的影响,基于仿真实验平台采集不同车流密度下的行驶数据,建立考虑车流密度的多马尔可夫矩阵车速预测模型;以整车燃油经济性和电池荷电状态(state of charge,SOC)平衡为优化目标,提出基于模型预测控制(model p...文章考虑车流密度对车速预测的影响,基于仿真实验平台采集不同车流密度下的行驶数据,建立考虑车流密度的多马尔可夫矩阵车速预测模型;以整车燃油经济性和电池荷电状态(state of charge,SOC)平衡为优化目标,提出基于模型预测控制(model predictive control,MPC)的混合动力汽车能量管理策略,并在MATLAB/Simulink中搭建控制策略模型;基于CRUISE软件搭建整车动力学仿真模型,并与MATLAB/Simulink进行联合仿真。结果表明,考虑车流密度的MPC能量管理策略使得整车燃油经济性有明显提高,相较于不考虑车流密度的能量管理策略提高6.33%。该文方法对于其他混合动力汽车的能量管理策略设计有一定的参考意义。展开更多
文摘The paper discusses the barriers of integration of management systems （IMS）. A model based on process is explored, It is indicated that integrating management systems should not ignore the characteristics of the management systems, especially scope issues. IMS needs to take into the continuous improvement.
文摘Health management permits the reliability of a system and plays a increasingly important role for achieving efficient system-level maintenance.It has been used for remaining useful life（RUL） prognostics of electronics-rich system including avionics.Prognostics and health management（PHM） have become highly desirable to provide avionics with system level health management.This paper presents a health management and fusion prognostic model for avionics system,combining three baseline prognostic approaches that are model-based,data-driven and knowledge-based approaches,and integrates merits as well as eliminates some limitations of each single approach to achieve fusion prognostics and improved prognostic performance of RUL estimation.A fusion model built upon an optimal linear combination forecast model is then utilized to fuse single prognostic algorithm representing the three baseline approaches correspondingly,and the presented case study shows that the fusion prognostics can provide RUL estimation more accurate and more robust than either algorithm alone.
文摘Based on the principles of system engineering,economics theory and local conditionof production,studies carried out by taking“quadratic-regression-orthogonal-rotational” and ran-domized complete block designs to determine the Optimal Agronomical Practices Package（OAPP）for Wheat Modelized Cultivation Management（WMCM）by system decision-makinganalysis.The OAPP was expected to meet various goals of different levels of yield and economicbenefit of middle and high fertility land in Beijing area.Taking cultivar JINGDONG-1（"JD-1"）asan example,the OAPP for grain yield≥6750 kg/ha and net benefit≥360 US （?）/ha was consist-ed as follows:density=195 plants/m<sup>2</sup>;spring irrigation times=4（stem elongation,booting,flowering,and 20 days after anthesis）;fertilization=150-188 kg N/ha,113-128 kg P<sub>2</sub>O<sub>5</sub>/ha.
文摘The life cycle of CIMS (Computer Integrated Manufacturing System) includes four phases:requirement analyzing, designing, implementation and running. For reducing the risk of investment and achieving better economic results the simulation technique is needed in the above four phases of CIMS life cycle. Under the support of China 863/CIMS plan a series of simulation projects are established. Some of them are finished with succeed and have been used in application. In this paper four simulation projects are introduced.(1) The Integrated Manufacturing Simulation Software (IMSS). It is an integrated platform, based on the discrete event simulation principle. It can be used to analyze and design CIMS, especially FMS; and evaluate the daily production plan.(2) The Advanced Hierarchical Control System Emulator (AHCSE), a software system, based on the finite state machine principle. It can be used to analyze and design of CIMS hicrarchical control system, and check expanded system performance before expanding.(3) The Factory Scheduling Environment (FASE), a software system based on the discrete event simulation principle and artificial intelligence technology. It can be used for shop floor scheduling. (4) The Machining Process Simulator (MPS). It can simulate the machining process of machining center by computer. It can check the correctness of NC code (including interference and confliction) and replace the real machining center to support the simulation environment for shop floor scheduling and controlling. There are three companies and universities joining in these four projects, they are: Tsinghua University,Huazhong University of Technology, Beliing Institute of Computer Application and Simulation.
文摘Based on the theory of marginal opportunity cost, one kind of green input-output table and models of power company are put forward in this paper. For an appliable purpose, analysis of integrated planning, cost analysis, pricing of the power company are also given.
文摘为保障复杂装备技术状态管理的有效集成和多方协同,实现技术状态管理业务数据的双重有序管控,提出基于领域系统(domain system,DS)的建模架构和设计方法。通过引入基于模式的系统工程(pattern-based system engineering,PBSE)框架,构建基于DS的复杂装备技术状态管理基本架构,设计DS元模型、DS模型、DS模式的建模方法,将国防部体系架构元模型(Department of Defense Architecture framework metamodel,DM2)进行复杂装备技术状态管理领域化重组为DS元模型,并通过领域元数据映射为DS模型,使其有序组织为适用于具体装备技术状态管理的DS模式。为验证所提方法的有效性,以运载火箭结构系统多视图物料清单(X bill of material,XBOM)为案例,开展基于DS的技术状态管理应用。结果表明,所提方法可为其技术状态管理提供兼具建模的一致性和可追溯性的实施方案,为复杂装备技术状态管理的领域模型配置提供指导性思路。
文摘文章考虑车流密度对车速预测的影响,基于仿真实验平台采集不同车流密度下的行驶数据,建立考虑车流密度的多马尔可夫矩阵车速预测模型;以整车燃油经济性和电池荷电状态(state of charge,SOC)平衡为优化目标,提出基于模型预测控制(model predictive control,MPC)的混合动力汽车能量管理策略,并在MATLAB/Simulink中搭建控制策略模型;基于CRUISE软件搭建整车动力学仿真模型,并与MATLAB/Simulink进行联合仿真。结果表明,考虑车流密度的MPC能量管理策略使得整车燃油经济性有明显提高,相较于不考虑车流密度的能量管理策略提高6.33%。该文方法对于其他混合动力汽车的能量管理策略设计有一定的参考意义。
