A new two-stage soft real-time scheduling algorithm based on priority table was proposed for task dispatch and selection in cluster systems with inaccurate parameters. The inaccurate characteristics of the system were...A new two-stage soft real-time scheduling algorithm based on priority table was proposed for task dispatch and selection in cluster systems with inaccurate parameters. The inaccurate characteristics of the system were modeled through probability analysis. By taking into account the multiple important system parameters, including task deadline, priority, session integrity and memory access locality, the algorithm is expected to achieve high quality of service. Lots of simulation results collected under different load conditions demonstrate that the algorithm can not only effectively overcome the inaccuracy of the system state, but also optimize the task rejected ratio, value realized ratio, differentiated service guaranteed ratio, and session integrity ensured ratio with the average improvement of 3.5%, 5.8%, 7.6% and 5.5%, respectively. Compared with many existing schemes that cannot deal with the inaccurate parameters of the system, the proposed scheme can achieve the best system performance by carefully adjusting scheduling probability. The algorithm is expected to be promising in systems with soft real-time scheduling requirement such as E-commerce applications.展开更多
铁路工程是典型的带状结构,具有线长、点广等特点,为实现铁路工程全线全方位、多角度、多尺度的可视化展示及综合分析,融合建筑信息模型(BIM,Building Information Modeling)、地理信息系统(GIS,Geographic Information Systems)、数字...铁路工程是典型的带状结构,具有线长、点广等特点,为实现铁路工程全线全方位、多角度、多尺度的可视化展示及综合分析,融合建筑信息模型(BIM,Building Information Modeling)、地理信息系统(GIS,Geographic Information Systems)、数字高程、倾斜摄影及矢量地图等数据,设计并研发铁路工程电子沙盘系统。该系统通过对实体铁路工程仿真呈现,将施工过程信息动态附加,形成可交付运营维护的建设数字资产。在京张(北京—张家口)、京雄(北京—雄安)及其他重大铁路项目中的应用结果表明,电子沙盘系统具有较好的实用性、可扩展性及可视化效果,可为铁路工程各类资源高效利用、仿真分析及科学管理提供服务,也可为其他铁路项目开展电子沙盘的设计与开发提供参考。展开更多
该文分析高校学生基础信息数据特点,针对本地数据管理不规范、不可追溯、关联性不足等问题,分别对Tableau Prep Builder和Power BI 2种商业BI工具数据预处理功能进行研究分析,提出基于2种BI工具的数据预处理的实现路径,并对2种数据处理...该文分析高校学生基础信息数据特点,针对本地数据管理不规范、不可追溯、关联性不足等问题,分别对Tableau Prep Builder和Power BI 2种商业BI工具数据预处理功能进行研究分析,提出基于2种BI工具的数据预处理的实现路径,并对2种数据处理方式进行比较。展开更多
为提高传统建筑设计和管理的效率,降低工程建造成本,研究基于BIM(Building Information Modeling)的铁路工程单元虚拟建造技术。将铁路工程单元按功能、专业、工项、构件等进行单元划分,通过文档流程引擎、电子沙盘、仿真模拟等关键技术...为提高传统建筑设计和管理的效率,降低工程建造成本,研究基于BIM(Building Information Modeling)的铁路工程单元虚拟建造技术。将铁路工程单元按功能、专业、工项、构件等进行单元划分,通过文档流程引擎、电子沙盘、仿真模拟等关键技术,模拟重点单元施工过程,改进并优化施工流程。研究结果可有效提高实际工程建设效率,为BIM在铁路工程的全面应用提供技术支撑。展开更多
基金Project(60573127) supported by the National Natural Science Foundation of China project(05JJ40131) supported by theNatural Science Foundation of Hunan Province
文摘A new two-stage soft real-time scheduling algorithm based on priority table was proposed for task dispatch and selection in cluster systems with inaccurate parameters. The inaccurate characteristics of the system were modeled through probability analysis. By taking into account the multiple important system parameters, including task deadline, priority, session integrity and memory access locality, the algorithm is expected to achieve high quality of service. Lots of simulation results collected under different load conditions demonstrate that the algorithm can not only effectively overcome the inaccuracy of the system state, but also optimize the task rejected ratio, value realized ratio, differentiated service guaranteed ratio, and session integrity ensured ratio with the average improvement of 3.5%, 5.8%, 7.6% and 5.5%, respectively. Compared with many existing schemes that cannot deal with the inaccurate parameters of the system, the proposed scheme can achieve the best system performance by carefully adjusting scheduling probability. The algorithm is expected to be promising in systems with soft real-time scheduling requirement such as E-commerce applications.
文摘铁路工程是典型的带状结构,具有线长、点广等特点,为实现铁路工程全线全方位、多角度、多尺度的可视化展示及综合分析,融合建筑信息模型(BIM,Building Information Modeling)、地理信息系统(GIS,Geographic Information Systems)、数字高程、倾斜摄影及矢量地图等数据,设计并研发铁路工程电子沙盘系统。该系统通过对实体铁路工程仿真呈现,将施工过程信息动态附加,形成可交付运营维护的建设数字资产。在京张(北京—张家口)、京雄(北京—雄安)及其他重大铁路项目中的应用结果表明,电子沙盘系统具有较好的实用性、可扩展性及可视化效果,可为铁路工程各类资源高效利用、仿真分析及科学管理提供服务,也可为其他铁路项目开展电子沙盘的设计与开发提供参考。
文摘为提高传统建筑设计和管理的效率,降低工程建造成本,研究基于BIM(Building Information Modeling)的铁路工程单元虚拟建造技术。将铁路工程单元按功能、专业、工项、构件等进行单元划分,通过文档流程引擎、电子沙盘、仿真模拟等关键技术,模拟重点单元施工过程,改进并优化施工流程。研究结果可有效提高实际工程建设效率,为BIM在铁路工程的全面应用提供技术支撑。
