In data stream management systems (DSMSs), how to maintain the quality of queries is a difficult problem because both the processing cost and data arrival rates are highly unpredictable. When the system is overloaded,...In data stream management systems (DSMSs), how to maintain the quality of queries is a difficult problem because both the processing cost and data arrival rates are highly unpredictable. When the system is overloaded, quality degrades significantly and thus load shedding becomes necessary. Unlike processing overloading in the general way which is only by a feedback control (FB) loop to obtain a good and stable performance over data streams, a feedback plus feed-forward control (FFC) strategy is introduced in DSMSs, which have a good quality of service (QoS) in the aspects of miss ratio and processing delay. In this paper, a quality adaptation framework is proposed, in which the control-theory-based techniques are leveraged to adjust the application behavior with the considerations of the current system status. Compared to previous solutions, the FFC strategy achieves a good quality with a waste of fewer resources.展开更多
近年来,节点地震采集技术发展迅速,在油气勘探中得到大规模推广应用。相对于有缆地震仪器,节点地震仪在带道能力、排列布设以及施工效率等方面具有显著的优势,但它无法实时获取采集的地震数据,给质量监控和数据评价带来一定困难。如何...近年来,节点地震采集技术发展迅速,在油气勘探中得到大规模推广应用。相对于有缆地震仪器,节点地震仪在带道能力、排列布设以及施工效率等方面具有显著的优势,但它无法实时获取采集的地震数据,给质量监控和数据评价带来一定困难。如何确保节点地震采集质量,保证节点地震仪工作状态良好成为采集施工中的重要环节,即保证设备的稳定性与安全性。结合野外地震采集施工模式和作业流程,介绍了多类型节点质控手机APP及质控数据综合分析平台设计思路,开展了节点通讯、手机定位及导航、节点位置监控、多模式巡检、数据可视化及统计分析等关键技术研究,并基于Visual Studio 2022集成开发环境,采用MVC设计模式研发了多类型节点质控手机APP及质控数据综合分析平台,解决了当前节点质控软件通用性不强,质控数据综合评价分析自动化程度低等问题。在实际生产应用中,软件性能稳定、运行流畅,大幅提高了节点地震仪质控效率及效果,可有效保障节点数据采集质量和资料品质,降低施工成本。展开更多
基金Supported by the National Key R&D Program of China(2016YFC1401900)the National Science Foundation of China(61173029,61672144)
文摘In data stream management systems (DSMSs), how to maintain the quality of queries is a difficult problem because both the processing cost and data arrival rates are highly unpredictable. When the system is overloaded, quality degrades significantly and thus load shedding becomes necessary. Unlike processing overloading in the general way which is only by a feedback control (FB) loop to obtain a good and stable performance over data streams, a feedback plus feed-forward control (FFC) strategy is introduced in DSMSs, which have a good quality of service (QoS) in the aspects of miss ratio and processing delay. In this paper, a quality adaptation framework is proposed, in which the control-theory-based techniques are leveraged to adjust the application behavior with the considerations of the current system status. Compared to previous solutions, the FFC strategy achieves a good quality with a waste of fewer resources.
文摘近年来,节点地震采集技术发展迅速,在油气勘探中得到大规模推广应用。相对于有缆地震仪器,节点地震仪在带道能力、排列布设以及施工效率等方面具有显著的优势,但它无法实时获取采集的地震数据,给质量监控和数据评价带来一定困难。如何确保节点地震采集质量,保证节点地震仪工作状态良好成为采集施工中的重要环节,即保证设备的稳定性与安全性。结合野外地震采集施工模式和作业流程,介绍了多类型节点质控手机APP及质控数据综合分析平台设计思路,开展了节点通讯、手机定位及导航、节点位置监控、多模式巡检、数据可视化及统计分析等关键技术研究,并基于Visual Studio 2022集成开发环境,采用MVC设计模式研发了多类型节点质控手机APP及质控数据综合分析平台,解决了当前节点质控软件通用性不强,质控数据综合评价分析自动化程度低等问题。在实际生产应用中,软件性能稳定、运行流畅,大幅提高了节点地震仪质控效率及效果,可有效保障节点数据采集质量和资料品质,降低施工成本。
