一种用于变电站二次屏柜的温湿度采样方案

针对智能变电站中二次屏柜温湿度采样控制的需求,在相应智能电子设备(IED)的开发中,结合相应的温湿度传感器,使用I2C接口的A/D采样芯片LTC2305对传感器传送的直流模拟信号进行信号采集,并采用一定的滤波算法,通过软硬件相结合的方法使其采样精度控制在0.5%以内。另外,针对温湿度等状态模拟量进入智能变电站过程层网络传送的要求,结合相应标准,详细分析了GOOSE报文中浮点数的编码方法及其发送机制,同时,提出了一种通过设置变化量门槛的方法,来减轻状态模拟量通过GOOSE上送网络时对网络通信性能造成的影响。     

相似材料模型湿度实时在线监控系统

设计了一种基于AT89S52单片机的适用于实验室中相似模型温湿度测量的装置,包括其硬件和软件的设计,以得到准确的拆除时间.装置采用AT89S52单片机作为控制器,挂接单个或多个SHT15型数字温湿度传感器采集模型中温湿度数据,通过连接到单片机上的LCD屏显示测量数据,并能够在湿度超限即达到预定模型强度时进行报警.     

基于Zigbee技术的土壤无线温湿度控制系统设计

智能节水滴灌控制是精准农业的一个发展方向.以CC2530型ZigBee芯片为载体,设计了可用于土壤滴灌控制系统的无线温湿度数据采集及控制系统.节点电路采用DHT11温湿度传感器,通过Zigbee无线网络将采集到的温湿度数据发给协调器端.协调器端接收到节点传输过来的数据包从Zigbee协议上解析实时温湿度数据,然后通过串口以固定的协议发送给DGUS串口屏,DGUS串口屏实时显示当前的温湿度值,实现了温湿度上限、下限超标报警及控制等功能.该系统可应用于智能节水滴灌控制系统,对节水灌溉具有重要的意义.     

基于物联网的新疆干旱区城市防护林温湿度监测系统

针对新疆干旱区城市防护林面积广阔、气候干燥缺水,工作人员测量数据任务量大,难以做到数据采集及时、准确,林业管理部门监管难度大等特点,将GSM无线通信技术及嵌入式技术结合在一起,设计了基于物联网的新疆干旱区城市防护林温湿度监测系统.系统利用温湿度传感器,结合现有嵌入式微处理器的开发和控制水平,开展基于GSM的远距离无线传输数据的研究,达到通过手机和电脑实现对温湿度的监测和管理的目的.测试表明,该系统具有良好的实用性、可靠性和可扩展性.     

基于CAN总线的智能温湿度传感器设计

介绍了以数字式温湿度传感器SHT75为检测器件,带CAN总线的智能温湿度传感器的设计.整个系统以单片机AT89S52作为处理器.由SHT75采集温湿度数据.AT89S52接收并处理数据,LED数码管分时显示测量的温湿度值.通过外扩的CAN总线控制器SJA1000和报文收发器PCA82C250,该传感器可直接作为CAN总线的一个从结点工作.由于采用了数字温度传感器做检测器件,不再需要放大电路和A/D转换器,SHT75与AT89S52接口简单,编程处理也变得简单.该传感器还提供两路频率输出,且频率随测量的温湿度值变化.     

图像识别技术在变电站屏柜运检中的应用

随着我国经济的快速发展,变电站的数量在不断增加,变电站运维人员繁重的运检工作量也在增加.为了减轻变电站中二次屏柜和开关柜的运维压力,解决查漏的程序多、周期长、人员效率低且易出错等不足,提出利用图像识别技术实现对变电站屏柜状态智能检测的方法.在实际应用中,通过对变电站巡检机器人和视频摄像头拍摄结果的识别分析,可以有效提高...     

煤矿井下温湿度监测和光纤通信系统的研究

针对煤矿井下采用热电偶测量环境温度的缺点,文章提出了一种基于单片机MSP430控制数字温度传感器DS18B20实现矿井下温湿度监测和光纤通信系统的设计方案。该系统通过单片机MSP430控制温度传感器DS18B20实现对煤矿井下的温湿度数据的采集;采用光纤传输实现温湿度信号的无失真传输;采用温湿度监控软件,通过串口通信,在PC机上实时监控系统的温湿度。实际测试表明,该系统工作稳定,温度测量精度达0.1℃,湿度测量精度达1%RH,可实现可靠的数据传输。     

基于USB接口的智能温湿度测记仪

该仪器选用温湿度一体数字量输出传感器SHT11对环境温湿度进行随时、定时、实时地检测,通过点阵图形式液晶显示模块HG012864同屏显示温湿度值、露点值以及日期和时间,温湿度值以及相对应的时间被保存在非易失性铁电存储器FM31256中,确保仪器掉电后数据不丢失.通过双模式USB接口将实时数据或存储数据上传给PC机,利用自编的应用软件绘制温湿度历史变化曲线或实时曲线,计算任意测试时间段的温湿度最大值、最小值、平均值、方差;还可进一步对数据进行统计分析,报表输出,同时可对仪器的基本采集参数进行设置.该仪器采用可充电锂电供电,功耗低、精度高、即插即用、通用性强.     

MSP430F149的无线温湿度环境实时监测系统

介绍了一种无线温湿度实时监测系统。系统以低功耗单片机 MSP430F149为主控制器,选用高精度低功耗温湿度传感器 SHT21测量环境的温湿度,并采用高精度实时时钟芯片 PCF8563为系统提供时间基准。系统根据实际需要设置温湿度的阈值,当所在环境的温湿度超出该阈值时,系统会发生报警,并将当前所处环境的时间、温湿度值和相关提示信息通过 GPRS 传输到移动终端。系统实现了对环境温湿度的无线实时监测,可适用于多种环境中。     

基于虚拟多传感器信息融合的粮情预警系统

在粮食仓储过程中,通过温湿度传感器、图像传感器采集到的温湿度、图像的实时数据,经过信息处理算法的变换和特征提取,得到具有不同特征信息的虚拟多传感器数据,采用D-S证据理论对数据进行信息融合,对粮食在仓储过程中的霉变、虫害等粮情进行动态预测分析,当发现有不良变化时,该系统能够及时发出预警信息,以保证粮食的储藏安全。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。