工业锅炉集中监视与监控系统   总被引：1，自引：0，他引：1  

丁鹏飞 《中国科技信息》2005,(16):72

为了保证工业锅炉系统安全高效地运行,对工业锅炉进行了集中监视与控制。集中监视与控制系统由两级计算机组成。上位机是工业控制计算机,主要完成智能化的后台管理和实时显示运行信息等功能,下位机是可编程控制器,主要完成现场信号和数据的采集及实时控制。该系统为工业锅炉高效安全生产提供了可靠的保障。  相似文献   

Measuring scientific contributions with modified fractional counting     

Gunnar Sivertsen  Ronald Rousseau  Lin Zhang 《Journal of Informetrics》2019,13(2):679-694

We develop and propose a new counting method at the aggregate level for contributions to scientific publications called modified fractional counting (MFC). We show that, compared to traditional complete-normalized fractional counting, it eliminates the extreme differences in contributions over time that otherwise occur between scientists that mainly publish alone or in small groups and those that publish with large groups of co-authors. As an extra benefit we find that scientists in different areas of research turn out to have comparable average contributions to scientific articles. We test the method on scientists at Norway’s largest universities and find that, at an aggregate level, it indeed supports comparability across different co-authorship practices as well as between areas of research. MFC is thereby useful whenever the research output from institutions with different research profiles are compared, as e.g., in the Leiden Ranking. Finally, as MFC is actually a family of indicators, depending on a sensitivity parameter, it can be adapted to the circumstances.  相似文献   

面向网络科技监测的分布式定向资源精确采集研究和应用     

谢靖  曲云鹏  刘建华 《现代图书情报技术》2011,(Z1)

在分析研究现有开源信息采集系统的基础上,综合应用开源框架,以开源爬虫Crawler4j为基础,设计开发基于开源框架的分布式定向资源采集系统,实现对网络信息实时精确的采集,以满足网络监测系统的及时性和准确性的要求。主要介绍系统的结构设计和功能实现,并详细阐述精确采集的方法和技术路线。  相似文献   

RFID在智能门禁系统中的应用     

瞿小玲  王洁 《黑龙江科技信息》2011,(21):32-33

结合RFID技术原理和优点,通过在建筑物内的主要管理区的重要部位的通道口安装门磁,电控锁或控制器,读卡器等控制装置,并设有管理人员在中心控制室监控,能够对各通道口的位置,通行对象及通行时间,方向进行实时控制或设定程序控制,从而实现对出/入口的安全控制。探讨了RFID在智能门禁系统中的应用,给出了该应用的具体实现框图,并对其实现的功能做了阐述。  相似文献   

共享调节学习中的监控过程:理论模型与解释案例     

陈向东  陈佳雯  杨德全 《电化教育研究》2022,(2)

在共享调节学习的序列中,监控的目的在于确定团队尚未实现的内容,引导团队在需要的时候调整任务理解、目标计划和参与行为。对监控的测量、观察或分析,首先需要明确监控活动的基本过程。研究从监控的发生条件、内容维度、调节类型等方面梳理已有研究,据此构建共享调节监控的过程模型,探索监控的内在机制和动态过程。以上海市闵行区高中信息科技教研组的一次教研活动为解释案例,分析了协作中的监控过程,初步验证了模型的适切性。研究表明:“监控的产生”“识别与分析”“反思与评估”“调节与适应”四个阶段是按顺序进行的;监控活动主要由团队面临的困难和挑战所引起,其中,支架干预具有重要作用;虽然识别与分析会在很大程度上引起反思与评估,但是也有一部分会直接导致调节与适应;即便是成熟的教师协作团体,仍然存在一定程度的不适应行为,需要外界的干预和支持。通过对监控序列的剖析,可以开发相应的监控促进策略、干预支架和支持工具,优化共享调节的内部机制。文中个案也体现了共享调节及其监控活动在教师协作活动中的应用效果,对改进教师教研具有重要的实践意义。  相似文献   

数据存储系统安全浅析     

王冰冰 《科技广场》2012,(4):45-47

随着信息化的快速发展,企业数据量日益增加,信息就是财富,面对各种漏洞攻击和病毒破坏,为了确保企业财富的安全可靠,保障数据的可用性、可靠性,确保企业业务的持续性,必须规划可靠的安全方案和防护措施来满足用户的需要。  相似文献   

北京市大兴区耕地质量等级监测控制点布设   总被引：12，自引：3，他引：9  

胡晓涛  吴克宁  马建辉  赵华甫  王倩 《资源科学》2012,34(10):1891-1897

本文以北京市大兴区为例,把理论模型构建和实证分析相结合,探讨耕地质量等级监测控制点布设方法。大兴区耕地质量等级监测变异半径为3.72km,布设理论监测样点43个,监测样点的控制范围为1086hm2,但若考虑到土地利用规划、土壤类型（亚类）、自然等各等别面积比例、利用等各等别面积比例、土地整理项目区、样点覆盖全面性等因素,监测样点合理布设数应为46个才能满足研究区耕地质量等级监测工作精度要求。研究表明,变异函数理论模型在研究耕地质量等级监测样点布设过程中具有较为理想的应用价值,可以提高监测样点的代表性和耕地质量监测信息的完整性。  相似文献   

武钢冷轧厂酸洗区域控制系统中的WinCC监控方案     

胡凡  胡鸣 《教育技术导刊》2010,(2)

武钢二冷轧酸轧站酸洗线(PicklingLine)是由德国西门子(Siemens)公司进行软件编程调试的酸洗板生产线。该生产线工艺先进,技术含量高,自动化控制程度高。该线采用WinCC监控系统使其在网络硬件以及软件控制思路上相比其他传统生产线都具有一定的先进性。描述了西门子WinCC组态软件在武钢二冷轧酸洗线中的应用,并阐述了相关的系统功能。实践证明,WinCC监控在生产中的应用效果良好。  相似文献   

Students’ and teachers’ monitoring and regulation of students’ text comprehension: Effects of comprehension cue availability     

《Contemporary educational psychology》2019

For regulation of text learning to be effective, students need to accurately monitor their text comprehension. Similarly, to provide adaptive instruction, teachers need to accurately monitor and regulate students’ text comprehension. Performing generative activities prior to monitoring has been suggested to provide students with diagnostic cues, improving monitoring accuracy; an open question is whether this would also help teachers. We investigated whether two generative activities, diagram completion and diagram drawing, improved secondary education students’ (n = 248) monitoring and regulation accuracy of text comprehension (Experiment 1) and whether viewing students’ diagrams improved teachers’ (N = 18) monitoring and regulation of students’ text comprehension (Experiment 2). Students’ monitoring and teachers’ regulation accuracy was higher in the diagramming conditions than in the no-diagramming condition. Students and teachers used diagnostic cues when judging students’ text comprehension: Improving students’ monitoring and teachers’ regulation of students’ text comprehension relies on improving accessibility of diagnostic cues.  相似文献   

People who cheat on tests accurately predict their performance on future tests     

《Learning and Instruction》2020

Studies suggest that people who cheat on a test overestimate their performance on future tests. Given that erroneous monitoring of one's own cognitive processes impairs learning and memory, this study investigated whether cheating on a test would harm monitoring accuracy on future tests. Participants had the incentive and opportunity to cheat on one (Experiments 1, 2, and 3, with N = 90, 88, and 102, respectively) or two (Experiment 4, N = 214) of four general-knowledge tests. Cheating produced overconfidence in global-level performance predictions in Experiment 2 (Cohen's d ≥ 0.35) but not in Experiments 1 or 4. Also, cheating did not affect the absolute or relative accuracy of item-level performance predictions in Experiments 3 or 4. A Bayesian meta-analysis of all experiments provided evidence against cheating-induced overconfidence in global- and item-level predictions. Overall, our results demonstrate that people who cheat on tests accurately predict their performance on future tests.  相似文献