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港口机械设备监控系统有多种实现方式,本文重点介绍使用西门子s7-300/400系列PLC作为控制器的港机设备中,PLC作为系统控制器将设备运行的实时参数以数据包的形式周期的发送到网桥模块以至GPRS模块,GPRS模块利用现有的GSM/GPRS移动通讯网作为通信传输的媒介来实现设备工况信息的传递,将工况数据实时发送至远程服务器,远程服务接受系统主要由安装在监控中心的中央监控系统组成。GPRS模块实时提供每一台设备的最新工况数据、运行的状况和报警信息,控制中心自动记录这些信息以便事后分析。此种方式因组网和实现简单易行,为类似应用提供了借鉴。 相似文献
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为提升电网设备运行效率评估的精准性及效率,设计基于设备状态信息的电网设备运行效率评估模型,以电网设备状态的描述、应用与测试量关系作为评估标准,依靠核心包、域包、记录包、电网设备包,组建电网设备状态信息模型,同时收集设备历史状态记录,构建状态信息数据库,利用数据包络算法进行电网设备权重相对效率评估,同时使用随机前线分析法确定设备产出情况,利用回归分析方法,调节和修正各种随机和外界环境因素,实现对电力系统设备的操作效率的精确评价。实验证明,所提方法评估结果准确,评估效率较好。 相似文献
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牵引变电设备在其生命周期内拥有大量异构的信息,然而以Autodesk Revit 为建
模软件建立牵引变电设备BIM 模型时,由于模型属性参数类型与参数分组方式有限,导致模型
无法满足对设备全生命周期信息集成的要求。本文针对上述问题,以牵引变压器为例,在分析
牵引变压器非几何信息并将信息进行分类分级的基础上,提出一种将牵引变压器非几何信息融
入设备BIM 模型使几何信息与非几何信息集成于同一Revit 文档的集成方法,并基于Revit API
开发插件对上述方法进行实现。结果表明该方法既实现了将设备几何信息与相对大量的非几何
信息集成于同一Revit 文档的目标,又保证了Revit 文档的轻量化,达到了预期目标。 相似文献
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石朝夕 《计算机光盘软件与应用》2012,(15):5-6
本文介绍神华国华电力公司设备信息管理及应用现状、以及结合公司点检定修深化需求,发挥设备集约分析管理的优势,开展的以单体设备为中心进行信息整合,建立国华公司设备数据库。项目以生产信息集成和共享为切入点,以设备信息"一横一纵三层次"为建设思路,通过对设备全寿命期内数据整合集成,实现设备数据相互调用、共享和分析功能,促进生产业务与信息工具的融合,进一步提高公司数字化、信息化、可视化水平。 相似文献
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在大数据时代,医疗设备复杂的运行状态环境中,实现准确的医疗设备运维预测,是实现智慧医疗的必要前提,为保证医疗设备的正常运行,此系统将使用Scala语言在Spark平台进行并行化实现,采用K-means聚类算法计算预测模型,提高算法处理大数据的能力。以数据采集、数据存储、数据分析为主,以Tomcat作为Web服务器框架进行系统可视化展现,打造一个大数据一体化系统平台,实现医疗设备运维信息的预测。 相似文献
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介绍了一种水闸自动控制系统,并用ModbusTCP协议实现了远程监控。该系统以可编程控制器(PLC)作为现场控制中心,连接现场控制对象;以悉雅特(Citect)组态软件作为本地上位机主监控界面,监视各设备的运行情况;通过电信专网,采用标准的ModubsTCP协议通讯,实现了对现场设备的集中控制和信息资源共享等功能,系统设计合理,运行可靠。 相似文献
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陈颖峰 《自动化技术与应用》2009,28(9):60-63
为实现水质监测,构建短信预报警系统,本文介绍了以OPC通信为基础,通过RSView32组态软件作为OP服务器,配合短信收发设备以短信业务SMS发送预报警信息,组建一套短信报警系统的实现方法。 相似文献
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Web-based information systems, such as search engines, news portals, and community sites, provide access to information originating from numerous information providers. The quality of provided information varies as information providers have different levels of knowledge and different intentions. Users of web-based systems are therefore confronted with the increasingly difficult task of selecting high-quality information from the vast amount of web-accessible information. How can information systems support users to distinguish high-quality from low-quality information? Which filtering mechanisms can be used to suppress low-quality information? How can filtering decisions be explained to the user? This article identifies information quality problems that arise in the context of web-based systems, and gives an overview of quality indicators as well as information quality assessment metrics for web-based systems. Afterwards, we introduce the WIQA—Information Quality Assessment Framework. The framework enables information consumers to apply a wide range of policies to filter information. The framework employs the Named Graphs data model for the representation of information together with quality-related meta-information. The framework uses the WIQA-PL policy language for expressing information filtering policies against this data model. WIQA-PL policies are expressed in the form of graph patterns and filter conditions. This allows the compact representation of policies that rely on complex meta-information such as provenance chains or combinations of provenance information and background information about information providers. In order to facilitate the information consumers’ understanding of filtering decisions, the framework generates explanations of why information satisfies a specific policy. 相似文献
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As we move further into the information age, it is becoming ever more apparent that society as a whole, and information and computing specialists as its agents, will have to confront the general problem of information overload. The rising flood of information will soon compel us to use techniques and resources aimed at maximising our information handling efficiency. Storing and retrieving digital information according to consumer requirements is only part of the equation, information must also be presented in a form suited to the consumer's needs at the time of consumption. We call this information customisation and characterise it as the transformation of information into its most appropriate form. Thus, customisation makes existing information more useful 相似文献
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《Computer Fraud & Security》1999,1999(7):18-19
Information security has been around for as long as information has been around; information systems security has not. Ever since some human wanted to hide some information from another human, there has been some form of information security. The type of security that has been used in the past and that is being used today is dependent on the tools available to protect information, as well as the media that was used to process, store and/or transmit that information. 相似文献
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针对社会保障信息系统中公民的个人信息隐私保护越来越困难的现状,介绍了社保系统的隐私保护难题包括如何保护信息安全和如何界定隐私信息2个方面,分析了隐私信息保护的2个根源性问题在于个人信息的不当采集和不当使用,在此基础上提出了利用转换原始数据的方式保护隐私信息的算法,阻止了信息拥有者对隐私信息直接或间接的获取,为社保系统中个人信息隐私保护的实现提供了一定的研究思路。 相似文献
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提出了一种新的基于区域互信息和局部频率信息结合的双向图像配准测度。首先,以原参考图像为参考,计算出正向变换下图像的区域互信息和Gabor滤波后的得到局部频率
信息;同时,以输入图像为参考图像,计算出逆变换下的逆向互信息和局部频率信息。将正向与逆向变换下的互信息和局部频率信息各自相乘后求和,减去两幅图像对应的配准残
量,得到双向图像配准度量,用于对输入图像进行配准。仿真实验结果在验证分析结果的同时也表明,方法对图像噪声、分辨率等具有较高的鲁棒性,可有效提高配准的精度。 相似文献
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高校图书馆基础信息包括读者信息、馆藏资源信息、特色数据库建设信息、馆内人员信息、硬件设施信息等,它的建设是为了提高图书馆的管理效率,使全馆各部门的工作情况一目了然,让管理者能及时掌握和调整各部门的工作,科学管理图书馆,使图书馆的工作能上一个台阶,更好地为读者服务。 相似文献
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提出了信息缺失条件下的相互依存网络抗毁性分析方法.首先,提出了结构信息和攻击信息,在结构信息已知的情况下利用信息广度参数和信息精度参数将攻击信息的获取抽象成无放回不等概率抽样问题,以此建立攻击信息缺失模型;然后,借助生成函数和渗流理论的思想提出了在随机信息缺失和优先信息缺失条件下的相互依存网络的抗毁性分析模型.根据此模型可以得到不同情况下的渗流阈值.通过以无标度网络作为实例进行进一步的实验发现信息广度参数和信息精度参数对相互依存网络的渗流阈值影响巨大,并且信息精度比信息广度影响更大,少量的高精度节点信息等价于大量低精度节点信息;已知少量最重要的节点就可以很大程度上降低相互依存网络的抗毁性;即使是在信息缺失的条件下,相互依存网络的抗毁性依旧远低于单层网络. 相似文献
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Brian Detlor 《Information Systems Journal》2003,13(2):113-132
Abstract. This case study investigates various ways in which different internet-based information systems (IS) are used by organizational participants. Borrowing theoretical insights on information behaviour accumulated over 50 years of information studies research, a conceptual framework is presented to help understand and assess the social and organizational impacts of internet-based IS. The framework describes the use of internet-based IS as a dynamic cycle of information needs–seeking–use activity situated in the context of a firm's information environment. Research questions pertain to the process of how individuals in organizations seek and use information from internet-based IS to satisfy information needs. In terms of information needs, this involves understanding the problem situations that lead participants to use internet-based IS, as well as the characteristics of those problems beyond subject matter. With respect to information seeking, this involves analysing how information from internet-based systems is displayed and formatted to signal their potential usefulness. In terms of information use, this involves how information obtained from internet-based systems is used in practice to resolve or redefine problems. Both quantitative and qualitative research methods are used. Data collection involves web tracking to identify significant episodes of internet-based IS activity, as well as one-on-one interviews to explore the context behind these episodes. Results suggest that it is possible and valuable to identify scenarios of internet-based IS use dominant in an organizational work setting. Doing so can help to identify ways to improve the situated use of internet-based IS that ameliorate the information needs–seeking–use cycle in firms. 相似文献