新型以太网控制器ENC28J60及其接口技术

介绍新型独立以太网控制器ENC28J60的结构、功能以及与外部接口的软硬件设计。ENC28J60以太网控制器采用标准的SPI串行接口,只需4条连线即可实现与单片机连接,有利于在小型系统上实现以太网功能。对于没有SPI接口的芯片通过模拟SPI接口的方式亦十分方便。     

基于ENC28J60的嵌入式网络接口的设计

设计了以ENC28J60为核心的以太网接口实现方案.描述了该系统硬件架构的设计方法.在简要介绍了以太网控制器ENC28J60的结构、功能、外围电路的基础上,对ENC28J60与Atmega16的SPI通讯进行了阐述.此方案不仅成本低,而且可以实现500Kbps以上的传输速率,满足了嵌入式系统的Internet控制要求.     

烟气在线分析数据远程传输

用单片机P89LPC938通过串口监听烟气在线分析系统数据,再通过SPI接口与以太网控制器ENC28J60通信,构成简易的WebServer,实现网络远程查看实时数据的功能。     

嵌入式系统网络接口模块设计

嵌入式系统已广泛应用于网络中,所以需要相应的网络接口满足需求,介绍了设计此系统网络接口模块所需要的核心以太网控制器ENC28J60,分析了其工作机理,通过设置ENC28J60内部寄存器来完成数据的有效接收和发送,采用高速高性能的LPC2132微控制器与以太网控制器ENC28J60和接口芯片MAX232相连接实现网络接口模块设计,对接口电路作了详细阐述,并对系统控制软件进行了具体分析。该模块用途广泛,具有良好的应用前景。     

基于ENC424J600的以太网与串行接口转换技术

论述了在STM32系列的MCU上移植TCP/IP协议栈LwIP,并利用新型以太网控制器ENC424J600实现网络数据传输功能。该系统主要完成的功能是接收上位机发送的数据,并将这些数据转换成通用串行接口输出。ENC424J600是Microchip新推出的一款以太网控制器,其速度优于ENC28J60,同时为用户提供两种接口模式。本文介绍了其基于SPI接口模式下的实现过程,详细描述了该网卡驱动的硬件电路和软件流程。     

基于LabVIEW编程的以太网远程温度监测

在传统的近距离温度监测基础上,引入基于以太网的远程监测方法.下位机以高档8位AVR单片机ATmega128为核心控制器,通过以太网接口模块ENC28J60接入以太网,最终与远程PC机进行通信.上位机由功能强大的图形界面语言LabVIEW编制,其中温度曲线可以直观地显示当前温度变化情况.该系统成本低,安装方便,无距离限制、传输速率高,能够满足不同场合的远程监测需要.     

STM32F103VET6和ENC28J60的嵌入式以太网接口设计

介绍了一种基于STM32F103VET6微处理器和以太网控制芯片ENC28J60的嵌入式以太网接口的设计方案。分析了基于Cortex-M3内核的微处理器STM32F103VET6的功能和特点,以及以太网控制芯片ENC28J60的主要性能和结构特性,并给出了接口的硬件和软件设计方案。本接口尺寸小、性能高,适合于便携式仪器仪表中的应用。     

基于LabVIEW编程的以太网选程沮度监测

在传统的近距离温度监测基础上，引入基于以太网的远程监测方法。下位机以高档8位AVR单片机ATmega128为核心控制器，通过以太网接口模块ENC28J60接入以太网，最终与远程PC机进行通信。上位机由功能强大的图形界面语言LabVIEW编制，其中温度曲线可以直观地显示当前温度变化情况。该系统成本低，安装方便，无距离限制、传榆速率高，能够满足不同场合的远程监测需要。     

基于以太网互联接口的新型停车场系统设计

针对目前大部分停车场系统还停留在RS485小范围内组网的问题,提出一种以AT89C52单片机和以太网控制芯片ENC28J60为控制核心的以太网/RS485互联新方案;该方案采用C/S通信模式,以AT89C52为控制网关,通过ENC28J60接人以太网,实现对停车场系统的远程监控和数据共享.详细阐述了以太网/RS485转换接口电路的硬件设计和软件设计;该方案无需改变现有硬件电路.通过在停车场系统中的实际应用,验证了该方案设计合理、成本低及可靠性高的优点.     

微控制器与组态王以太网通信系统的实现

为了通过以太网实现组态王软件监控用户微控制器系统的数据信息,设计了一种基于欧姆龙FINS/UDP协议的微控制器与组态王通讯模块.该模块运用CORTEX-M3为内核的STM32F103T8单片机为核心器件,通过RS-485接口电路采集外部用户微控制器系统的数据信息,然后控制以太网控制器ENC28J60接收和响应组态王的FINS指令帧,从而间接实现微控制器系统与组态王的以太网通讯.     

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     

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.     

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。