一种改进型B/S结构的在线检测系统设计

远程在线监测系统应用计算机网络、信息集成、专家系统等多门学科的综合技术,通过Internet网络在异地实现对现场设备实时监视,并根据监测数据进行故障的预警和诊断,并为预维修提供技术基础.本文以中间件技术为核心,通过ActiveX技术改进B/S模式构建的实时在线监测系统提高Web页面交互能力和数据实时传输能力,使得B/S结构能够很好的适应监测系统的建设.     

基于中间件技术的远程实时监测系统

重点介绍了一种新型的基于中间件技术的分布式远程实时监测与诊断系统,提出了由数据采集层、中间件应用服务器层、数据发布层组成的多层分布式实时监测系统模型;并针对中间件服务器层所涉及的一些关键技术进行了论述。设计了能够可靠传输实时监测数据的应用层协议,应用该模型和方法开发的远程实时监测与诊断系统在石化企业得到实现与验证。     

基于嵌入式Linux的实时视频服务器

介绍了一种支持视频实时采集、编码和传输的网络实时视频服务器。服务器基于嵌入式Linux系统,采用H．263视频编码技术和RTP／RTCP传输协议。给出了服务器软件的总体结构以及图像采集、格式转换、H．263编码和RTP协议传输4个功能模块的实现,并对系统进行了测试和实验。实验结果表明,系统在保证传输质量的同时具有良好的带宽适应能力。     

基于B/S结构的网络异常数据实时监测方法研究

针对传统技术中采用C/S结构存在的不足,提出了基于B/S结构(Brower/Server,浏览器/服务器)的监测方法,并构建出远程、实时、在线异常数据实时监测系统.该系统包括数据层、传输层、应用层、表示层和远程用户监控中心,通过Internet网络下载Web浏览器,在IE网站登录远程监控管理网站,实现远程操作界面的数据通讯,并通过网页上下载带有WinSocket的ActiveX控件,建立起数据通讯.还设计出基于S3C44B0处理器的远程监控终端硬件结构,采用网络数据过滤算法,降低数据包传递量,以提高网络运行数据的精度.实验表明,本方案在数据传输的实时性上优于C/S结构,大大减轻了网络数据传输负荷量.     

煤矿设备状态监测系统设计

针对煤矿井下设备群同时作业时设备监测数据高并发导致的低传输效率问题,提出了一种煤矿设备状态监测系统设计方案。该系统通过数据集成网关有效消除传感器网络的异构性:在数据集成网关中对不同传感器进行注册,利用传感器网络协议适配器调用不同传感器网络协议解析接口来消除传感器网络的异构性,生成统一格式的Java Script Object Notation(JSON)数据,并将数据发送到对应的消息推送服务中,通过ActiveMQ消息队列中的Queue通道进行点对点传输,数据传输服务将消息实时推送到网络传输模型中,实现设备状态数据的高并发传输,保证监测数据的实时性和可靠性。采用Netty网络传输模型避免空轮询导致的服务器负载增加,提高监测数据传输效率:在数据采集过程中,多个设备同时作业导致数据采样频率和传感器终端的并发请求数量升高,Netty模型中的Epoll模式优先处理已就绪的I/O连接,从而减少空轮询现象。测试结果表明,随着系统并发请求次数增加,采用Java Non-blocking I/O(NIO)模型比采用Netty模型的系统CPU使用率高28%;在系统并发请求次数相同的情况下,采用Java NIO模型的系统平均响应时间大于采用Netty模型的系统。采用Netty模型能有效提升煤矿设备状态监测系统的高并发处理能力,满足设备监测数据高效传输要求。     

基于流媒体技术的广播音频实时监测系统

该监测系统采用了基于Linux开发平台,以海康威视音频采集卡进行数据采集,并对采集的数据进行声音／调制解调器插卡（AMR）压缩和MP3压缩,进而减小网络传输过程中的数据带宽,实现教据在调制解调器和宽带模式下的传输,保证用户监测终端可以收测到清晰流畅的实时音频。在采集端和用户监测终端之间的通信采用实时流传输协议（RTSP）进行通信。     

基于多层B/S模式的监测系统

本文阐述当前的Internet网络和监测技术,提出一个远程实时监测系统--基于多层B/S模式的网络监测系统,系统地论述了浏览器、Web服务器、应用服务器、数据服务器体系结构和实现技术.     

基于C/S的传感器网络在生命信息监测系统中的应用

为了改进传感器网络的实时性和提高数据的传输能力,采用客户端/服务器(C/S)模式实现传感器网络数据的实时监测,通过定时与事件相结合的触发方式,利用多线程技术和C/S模式程序设计方法,以远程人体生命信息采集程序为例,实现信息采集、存储与实时监测等多种功能。实验表明:采用C/S模式和多线程等技术,传感器网络系统的实时响应性强,对无线传感器网络的数据堵塞现象有明显改进。     

基于HTTP协议的地质灾害数据传输系统设计

针对当前地质灾害监测仪与Web服务器通讯存在的数据易丢失、服务器资源被大量占用、后期维护麻烦等问题,提出了一种基于超文本传输协议(HTTP)的地质灾害监测数据传输系统的设计方法.对基于HTTP协议的地质灾害数据传输系统的网络构建、数据传输模块的设计以及Web服务器的设计做了详细介绍,并对数据传输系统进行了测试.测试结果表明,系统实现了地质灾害监测仪与Web服务器间的数据可靠传输,避免了数据丢失,对服务器负荷量小,能够实现服务器与更多的监测仪器的数据传输.对推进地质灾害监测信息化的建设具有重要意义.     

基于STM32的泥石流远程监测系统设计

泥石流在形成过程中泥位和流速会发生明显变化,因此设计了一种基于STM32和AD7706的低功耗泥石流远程监测系统,可实现对泥石流沟降雨量、泥位、流速等数据实时在线监测与预警预报。该系统通过Micro SD卡实现数据存储,利用GPRS/北斗双模通信网络将监测数据传送至地质灾害监测预警云服务器,实现24小时不间断对泥石流现场参数进行数据采集、传输、分析及预警判断,可在泥石流灾害监测中推广应用。     

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。