多类型智能表数据集中器的研究与设计

为提高自动抄表系统的效率,论文介绍了一种可对水、电、气等多种类型的智能仪表进行数据采集和管理的新型数据集中器的结构模型。集中器以S3C2440微处理器为硬件核心,嵌入式μCLinux为操作系统,实现了数据采集、分析、存储、以太网、GPRS通信等多任务功能。此模型数据集中器主要针对多类型智能仪表数据信息进行采集,通过RS485或ZigBee无线通信上传到数据集中器。集中器具有Webservice服务功能,用户可登录访问集中器Web页面,对智能仪表访问、管理。     

DJGL33-CL818C集中器在智能化小区集抄系统中的应用*

集中器是智能化供电小区建设中集抄系统的重要组成部分,DJGL33-CL818C型集中器采用的技术先进,贴近用户实际用电情况而设计,性能优良。文章简要的介绍了DJGL33-CL818C型集中器的主要特点及技术指标,着重介绍了该集中器在智能化小区集抄系统中的主要功能以及集中器的维护。     

基于M_BUS总线的智能水表集中器的设计

智能水表集中器是智能水表自动抄表系统的重要组成部分.介绍了智能水表集中器的原理,分析了智能水表集中器的硬件电路,详细阐述了智能水表集中器软件的设计流程.该集中器具有实时性好,稳定性高,存储量大等优点,在具体的使用中有比较好的效果.     

基本型数据通信控制规程的一种实现

一、基本情况 1.本通信软件实现基本型控制规程,及其会话型的扩充和编码独立的扩充。 2.系统配置:上端为大型主机,下端为一集中器。集中器再联接若干工作站。本通信软件处在集中器与大主机之间集中器一侧,实现主机与集中器之间,并通过集中器与工作站之间的通信。主机为控制站,集中器为辅助站。 3.本通信软件扩充了个别控制功能及其相应的控制字符,以适应通信的需要。     

远程抄表系统中集中器的设计

针对目前抄表方式中存在的问题,本文提出了以无线为主要通信方式的远程抄表系统.详尽介绍了抄表系统中集中器的硬件结构,MCU、GPRS模块、无线射频模块、存储模块和RTC模块的芯片的选型、电路连接以及软件的设计.     

基于μC/OS-II的电力线载波抄表系统集中器

低压电力线载波远程抄表技术是一项有广泛应用前景的新技术。介绍了一种基于μC/OS-II的电力线载波抄表系统集中器,包括整个远程抄表系统的结构,集中器的功能和软硬件设计。该集中器在现场经过了测试实践,达到了预期目标。     

集中器与配变终端的级联运行分析

以中山计量自动化系统的运行情况为例,介绍集中器与配变终端级联运行的现状和经济性,论证了其必须在特定的条件下才能发挥作用.     

机载远程智能接口数据集中器研究与实现

文章研究目的是研究新一代飞机机载计算机中具有通用化、标准化的远程智能接口数据集中器,以满足新一代飞机综合化航空电子系统要求;文章首先描述了远程智能接口数据集中器功能原理,然后重点介绍了AFDX网络通信、高速模拟信号采集、小信号处理、大功率控制、接口控制软件设计等远程智能接口关键技术,最后给出远程智能接口数据集中器具体实现;机载远程智能接口数据集中器已经在新一代飞机综合航电系统通过系统验证,试验结果证明远程智能接口数据集中器实现了各种传感器信息就近采集、及时进行数据转换和驱动输出控制的功能要求.     

低压电力线载波集中抄表系统集中器设计

分析了集中器在低压电力线载波集中抄表系统中的功能,详细介绍了集中器的软、硬件结构原理及具体实现。在硬件结构上,为集中器设计了多种通信信道,用户可根据实际需要在多个信道之间切换。软件实现方面,上行通过串口中断接收管理中心下发的指令,下行由主控CPU完成控制,主动下发抄表指令并接收电表数据。该集中器数据抄到率达100%,已经通过中国电力科学院检测。     

自动抄表系统集中器的设计

介绍了自动抄表系统中集中器的硬件设计，该集中器功能完整，接口丰富。集中器与采集器或电表之间采用电力线载波通信的方式。选用PLCi363载波芯片作为电力线载波通信Modem芯片；集中器与主站之间采用无线传输方式，选用RS232接口或RS485接口与GPRS模块连接，利用GPRS无线传输提高了数据传输速度，节约了整个系统的成本。     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.