基于低压电力线载波的测控系统设计设想

本文描述了基于低压电力线载波的,以工厂生产实际要求为背景的设备和生产环境的测控系统的设计设想。前部分简要介绍了电力线载波及其特点和优点,对选择基于电力线载波进行通信作一定的说明。最后指出了现有设想的一些问题。     

电力线扩频载波技术在抄表中的应用

简述了居民抄表中电力线扩频载波技术的原理及其在抄表中的应用,接着介绍一下目前普遍采用的几种电力线扩频载波技术及其代表产品,最后大胆设想了未来居民抄表系统———基于互联网的远程监控系统模式。     

一种基于电力载波的家庭网络与以太网的连接方法

提出了一种将以太网嫁接到电力线上，实现基于电力载波的家庭网络与以太网连接的构思。介绍了实现这种构思的电力线载波以太网方案，采用8位单片机W78E58控制PCI总线网卡接收以太网命令并通过电力载波将其转发到家庭电力线网络中，从而达到远程控制家庭网络设备的目的，为家庭网络的实现提供了新的思路和实现手段。     

基于单片机的窄带电力线载波通信模块设计

设计了基于通用单片机的电力线载波通信模块。首先给出了载波模块的总体设计，其次进行了详细的软硬件设计，最后进行了模块测试。载波模块采用瑞萨高性能单片机R5F100BE、UTC的解调芯片MC3361BPL及外围电子元器件，设计了过零检测电路、载波耦合电路、载波发送放大电路、载波解调电路，形成了先进的低成本电力线载波模块硬件。软件采用了BFSK调制、直接扩频技术，设计了单芯片三信道通信软件流程，在有限的计算资源下实现了三信道通信互不影响，并给出了发送与接收模块程序设计、DFT解码算法设计，实现了高灵敏度的421±15 kHz频率的电力线载波通信。该设计具有实现成本低、研发投入小等优势，在电力线物联网领域具有一定的实用价值。     

一种海洋传感器的电力线载波数据采集传输系统

针对电力线载波技术在数据传输中的应用,研究并改进了现有的基于220VAC电力线载波技术,实现了一种基于500VAC电力线载波模块,设计了基于500VAC船载数据采集传输系统,以获取海洋船载5路阻性负载的电压电流值和15路液压值,同时设计500VAC输出可控电路,以降低水下模块功耗。系统以STM32F107处理器为核心,以改进的500VAC电力线载波模块为数据收发模块,在应用上实现了船载数据采集、传输和误码率的测试。经测试,能可靠地将数据传输到上位机,满足了设计要求。     

高频通道特性探讨

讨论了电力线载波设备与高频通道配合时需注意的事项，通过计算推导出来电力载波设备在接入通道或负载两种状态下电平差值的计算公式，并提出了在电力线载波设备接入高频通道时需注意的问题，为实际工程中电力线载波使用提供帮助。     

基于电力线载波传输技术的井下有毒气体监测系统的设计

针对现有便携式检测设备在监测井下有毒气体过程中存在使用不便、效率低等问题,提出了一种基于电力线载波传输技术的井下有毒气体监测系统的设计方案,介绍了系统的组成、主要电路的设计等。该系统通过使用电力线载波芯片LME2200C、电力线载波传输技术,实现了井下有毒气体的远距离实时监测,有效保证了工作人员的人身安全,提高了工作效率。     

基于电力线通信的智能语音通信模块设计

介绍了基于电力线载波通信的室内智能语音通信模块的设计思路和过程。以电力线载波收发模块为核心,采用AT89S52微控制器作为语音播放的控制单元,设计了电力线载波收发电路,语音录放电路和液晶显示电路。详细阐述了智能语音模块的硬件设计和软件设计。首端发送的数据可以在终端上通过12864液晶显示出来。     

基于电力载波的智能校园节电系统研究

介绍一种基于51单片机的电力线载波技术的校园节电控制系统的工作原理和结构。直序扩频半双工异步调制解调器PL2102载波芯片,通过电力线载波应用系统实现教室电灯的管理和控制,给出用PL2102对电灯进行控制的基本原理、软硬件实现方法及其设计原理图。     

基于电力线数字家庭实现方案

分析了电力载波数据通信的特点,介绍了几种典型的电力载波芯片,提出了一个基于电力线的数字家庭实现方案。     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.