排序方式: 共有21条查询结果,搜索用时 15 毫秒
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应用C++ Builder实现实时数据采集、显示的方法 总被引:2,自引:0,他引:2
集散控制系统中数据的实时采集和显示是较重要和较难实现的问题。文中针对一个自行设计的集散控制系统,介绍了在W Iindows操作系统下,利用可视化编程语言C Builder中的时间控件Ttimer完成定时作用,产生实时时间信号直接触发处于后台运行的程序,实现生产现场中数据的实时采集和数据动态显示。所用程序由可视化编程语言C Builder编写,给出了相应的程序。 相似文献
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描述一种基于CAN总线的中波发射机监控系统的实现方案.该方案通过工业CAN-bus现场总线控制系统iCAN构建分布式数据采集网络,并分析了系统工作原理和软硬件结构. 相似文献
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介绍了某库区滑坡体经过整治后的遥测预警系统的设计与实现,较深入地介绍了如何利用MCS-51单片机完成滑坡体相关数据的采集,并结合GPRS模块LT8030,将采集的数据信息通过GPRS无线通信网传输到互联网上所指定的服务器。简要叙述了GPRS这一新型的移动数据通信业务的原理和通信协议,着重讨论了传感器选型,同时还给出了部分硬件电路图。 相似文献
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The paper proposes a prediction-mode-based filtering mechanism (PMF) to solve the problems of transmission energy wasting caused by time-redundant data in wireless sensor networks (WSN), according to the characteristic of spatio-temporal correlations on sampling series in data-collection. Prior works have suggested several approaches to decrease energy cost during data transmission process via data aggregation tree structure. Distinguish from those methods in above researches, our proposed scheme mainly focus on reducing the temporal redundant degree in event-source to achieve energy-saving effect via self-adaptive filtering structure. The framework of PMF for energy-efficient collection is composed of prediction module for mining the change law of time domain, self-learning module for updating model, and driving module for controlling data filtering operation.Combined with the design of error driving rule and threshold distributing rule, which is the middleware in the above filtering mechanism, the quantity of transmission load in networks can be greatly inhibited on the premise of quality of service (QoS) assurance and energy consumption can be reduced consequently. Finally, the experimental results show that the performance of PMF can significantly outperform some classical data-collection algorithms on energy-saving effect and self-adaptability. 相似文献
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一个基于XML的WEB数据收集模型的研究 总被引:15,自引:0,他引:15
目前研究的热门领域Web数据挖掘是从WWW资源上抽取信息(或知识)的过程,是对Web资源中蕴含的、未知的、有潜在应用价值模式的提取。其一般的过程可表示为:信息的发现、信息的选择和预处理、分析过程、产生结果犤1犦。WEB上的数据收集是对WEB数据挖掘的一种支持技术,是WEB数据挖掘的第一步。该文提出了一种基于XML技术的WEB数据收集模型,并实现了其中的一些主要功能。同时针对模型系统的不足做了一些有意义的改进探索。 相似文献
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介绍了在航测数据采集中,运用MiroStation二次开发语言MDL、VC^++和动态链接库技术开发出航测数据采集系统,该系统主要用以控制数据采集的标准化,提高生产效率和数据质量。 相似文献
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A 16-channel system aimed at testing specimens for isothermal and cyclic thermal creep is developed and constructed on the
contemporary element base. The system makes it possible to perform continuous long-term measurement of strains, forces, and
temperature, accumulate and store the data of measurements. In the course of the tests, the specimens can be heated to a temperature
of 1700°C. Due to the possibility of isothermal and cyclic thermal testing of specimens with simultaneous application of tensile
loads, one can simulate the operation of structural elements under the conditions of complex changes in the force and thermal
loads.
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Translated from Problemy Prochnosti, No. 6, pp. 124 – 131, November – December, 2005. 相似文献