针对航天嵌入式软件(aerospace embedded software,AES)时序需求复杂带来的时序需求定义不准确问题,提出一种基于MARTE(modeling and analysis of real-time and embedded systems)模型的数据流时序(data flow timing based on MARTE,DF...针对航天嵌入式软件(aerospace embedded software,AES)时序需求复杂带来的时序需求定义不准确问题,提出一种基于MARTE(modeling and analysis of real-time and embedded systems)模型的数据流时序(data flow timing based on MARTE,DFT-MARTE)模型,设计基于该模型的处理点缓存计算算法、时序偏离概率检测算法和时序序列分析算法。处理点缓存计算算法动态更新缓存空间,使后续时序检测正常执行;时序偏离概率检测算法利用多线程并发模拟时序特性,检测需求中时序偏离问题;时序序列分析算法是基于梯度下降算法,拟合时序序列,指导用户优化需求。该模型相比传统数据流模型更适用航天嵌入式软件,利于后续开发和维护,具有极高的应用价值。展开更多
The characters of marine data, such as multi-source, polymorphism, diversity and large amount, determine their differences from other data. How to store and manage marine data rationally and effectively to provide pow...The characters of marine data, such as multi-source, polymorphism, diversity and large amount, determine their differences from other data. How to store and manage marine data rationally and effectively to provide powerful data support for marine management information system and "Digital Ocean" prototype system construction is an urgent problem to solve. Different types of system planning data, such as marine resource, marine environment, marine econotny and marine management, and establishing marine data architecture frame with uniform standard are to realize the effective management of all level marine data, such as national marine data, the provincial (municipal) marine data, and meet the need of fundamental information-platform construction.展开更多
介绍了CRM系统的相关知识,阐述了数据仓库技术在CRM系统中应用的必然性,给出了一个基于数据仓库技术的分析型CRM系统的体系结构图,并且针对某网上书店,以客户购买主题为例,提出了该分析型CRM系统中客户信息数据仓库模型的设计方案,具体...介绍了CRM系统的相关知识,阐述了数据仓库技术在CRM系统中应用的必然性,给出了一个基于数据仓库技术的分析型CRM系统的体系结构图,并且针对某网上书店,以客户购买主题为例,提出了该分析型CRM系统中客户信息数据仓库模型的设计方案,具体阐述了概念模型设计、逻辑模型设计和物理模型设计,并以MS SQL Server 2000平台为基础,给出了具体的实现,在企业引入分析型CRM系统时为构建数据仓库提供了参考依据。展开更多
文摘针对航天嵌入式软件(aerospace embedded software,AES)时序需求复杂带来的时序需求定义不准确问题,提出一种基于MARTE(modeling and analysis of real-time and embedded systems)模型的数据流时序(data flow timing based on MARTE,DFT-MARTE)模型,设计基于该模型的处理点缓存计算算法、时序偏离概率检测算法和时序序列分析算法。处理点缓存计算算法动态更新缓存空间,使后续时序检测正常执行;时序偏离概率检测算法利用多线程并发模拟时序特性,检测需求中时序偏离问题;时序序列分析算法是基于梯度下降算法,拟合时序序列,指导用户优化需求。该模型相比传统数据流模型更适用航天嵌入式软件,利于后续开发和维护,具有极高的应用价值。
文摘The characters of marine data, such as multi-source, polymorphism, diversity and large amount, determine their differences from other data. How to store and manage marine data rationally and effectively to provide powerful data support for marine management information system and "Digital Ocean" prototype system construction is an urgent problem to solve. Different types of system planning data, such as marine resource, marine environment, marine econotny and marine management, and establishing marine data architecture frame with uniform standard are to realize the effective management of all level marine data, such as national marine data, the provincial (municipal) marine data, and meet the need of fundamental information-platform construction.
文摘介绍了CRM系统的相关知识,阐述了数据仓库技术在CRM系统中应用的必然性,给出了一个基于数据仓库技术的分析型CRM系统的体系结构图,并且针对某网上书店,以客户购买主题为例,提出了该分析型CRM系统中客户信息数据仓库模型的设计方案,具体阐述了概念模型设计、逻辑模型设计和物理模型设计,并以MS SQL Server 2000平台为基础,给出了具体的实现,在企业引入分析型CRM系统时为构建数据仓库提供了参考依据。