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 cannen 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
针对电子财务会计信息电算化系统在复杂环境下存在的工作时效性差和运营成本高等问题,文中提出一种新的ERP环境下电子财务会计信息电算化系统。首先,该系统选择C/S方式、B/S模式和Web服务器,并且采用Interface Package作为数据接口构建...针对电子财务会计信息电算化系统在复杂环境下存在的工作时效性差和运营成本高等问题,文中提出一种新的ERP环境下电子财务会计信息电算化系统。首先,该系统选择C/S方式、B/S模式和Web服务器,并且采用Interface Package作为数据接口构建混合模式结构,完成电算化系统编码;其次,结合三层结构构建数据访问层与业务逻辑层,分离数据实体与业务逻辑;最后,考虑到数据访问的便捷性和安全性,通过SQL Server 2018数据库完成科目编码设计与实体关系描述,采用可视化工具优化数据库,设计数据库视图功能,完成ERP环境下电子财务会计信息电算化系统的设计。实验结果表明,所设计系统的运营成本中,支出仅为500万元,收入为923万元,相比于企业未应用该系统前,支出降低329万元,收入增加521万元,且时效均在2天以内。该系统能够大幅度降低运营成本,显著地提升会计信息的时效性。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 cannen 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。
文摘针对电子财务会计信息电算化系统在复杂环境下存在的工作时效性差和运营成本高等问题,文中提出一种新的ERP环境下电子财务会计信息电算化系统。首先,该系统选择C/S方式、B/S模式和Web服务器,并且采用Interface Package作为数据接口构建混合模式结构,完成电算化系统编码;其次,结合三层结构构建数据访问层与业务逻辑层,分离数据实体与业务逻辑;最后,考虑到数据访问的便捷性和安全性,通过SQL Server 2018数据库完成科目编码设计与实体关系描述,采用可视化工具优化数据库,设计数据库视图功能,完成ERP环境下电子财务会计信息电算化系统的设计。实验结果表明,所设计系统的运营成本中,支出仅为500万元,收入为923万元,相比于企业未应用该系统前,支出降低329万元,收入增加521万元,且时效均在2天以内。该系统能够大幅度降低运营成本,显著地提升会计信息的时效性。
