嵌入式系统Internet打印的设计与实现

本文通过设计实例介绍了一种嵌入式网络打印的实现方案。该方案选用ATmega128为MPU、LAN91C111为网络控制器,以通用的SPP打印并口作为物理输出端口,硬件构成上具有典型意义。软件上精简了TCP/IP协议栈,完成了网络接口程序的设计,构建了嵌入式WEB服务器。在分析网络打印模型的基础上,实现了IPP网络打印协议的基本功能。     

基于TMS320DM642的嵌入式TCP/IP协议栈的实现

为了在DSP上实现网络视频传输,提出了一种有效、经济的嵌入式TCP/IP协议栈实现方案。详细阐述了其协议接口的设计,包括操作系统API及底层驱动程序的设计,给出了网络初始化的控制流程。     

构建安全的嵌入式互联网

本文详细地分析了网络数据安全的各种实现方法和与嵌入式互联网安全相关的各种安全协议,旨在为嵌入式互联网系统的设计者在设计系统的安全方案时提供可行的设计依据     

嵌入式Web服务器的研究与设计

嵌入式设备的网络化已成为目前嵌入式发展的一个重要方向和必然趋势.介绍了采用嵌入式实现高性能、高可靠性和低成本网络服务器的方法.在嵌入式芯片上,以uClinux操作系统为基础,进行了CS8900A网口芯片的驱动设计,TCP/IP协议族的设计,提出了构造嵌入式HTTP服务器的一种可行方案,并最终实现了嵌入式网络服务器.设计的嵌入式Web服务器将在远程数据采集、工业控制等领域有着广泛的应用前景.     

基于ARM核的嵌入式TCP/IP协议栈简化实现

结合具体的工程实例,通过分析嵌入式TCP/IP协议栈的设计原理,研究并简化了嵌入式TCP/IP协议栈的通信模型、体系结构和实现方案。开发出基于SAMSUNG S3C44B0X微处理器和RTL8019AS以太网物理层接口的低功耗网络控制器,并通过Socket编程在嵌入式μCLinux系统上实现了网络通信,达到系统设计目标。     

LwIP协议栈在SoPC系统中的实现

提出了基于μC/OS-Ⅱ的LwIP协议栈在SoPC系统中实现的方案.介绍了嵌入式TCP/IP协议栈LwIP,阐述了其移植原理;在SoPC系统上实现了LwIP协议栈的移植,并给出了在具体软、硬件平台上的移植实例.实验结果表明:移植后的协议栈实现了网络的基本功能,且运行稳定,为SoPC类型的Internet嵌入式系统应用提供了一个基于μC/OS-Ⅱ的小型网络模块.该方案可应用于信息电器和网络化的仪器、仪表方面.     

RTP/RTCP实时传输协议的研究与Linux实现

文章在仔细分析研究了RTP/RTCP实时传输协议的基础上,阐明了RTP/RTCP协议的基本原理。提出了一种嵌入式Linux平台下RTP/RTCP协议栈的设计模型与实现方案,并且详细论述了解决网络时延抖动的JitterBuffer机制。该设计与实现方案目前已应用于基于嵌入式Linux平台的媒体网关中,完全能够满足该媒体网关对于多路语音实时传输的通信需求。     

基于RTP协议的嵌入式网络视频传输系统

本文对RTP协议的相关概念和特性进行了简述,给出了在嵌入式系统中通过RTP协议进行网络视频传输的设计方案。在该方案中,引入了Session对象用于实现嵌入式系统之间的通信,同时给出了基于RTP协议的程序流程图及重要伪代码。并在嵌入式Linux平台上成功实现了基于RTP协议的网络视频传输系统,该系统具有传输速度快,视频清晰度高等优点。     

嵌入式移动IPv6的设计与实现

移动IP作为网络层的移动解决方案,能够为移动节点在不同网络间移动提供不间断的网络连接。本文在深入分析移动IPv6协议的基础上,设计了一套移动IPv6的整体实现框架;同时针对嵌入式系统的特点,提出一种移动IPv6在嵌入式终端上的实现方案,并完成了一套实验系统。     

嵌入式系统的Internet接入实现

介绍了嵌入式Internet的概念和嵌入式系统的Internet接入实现方案，讲述了在微控制器（MUU)中实现嵌入式WebServer的方法。在分析嵌入式Web服务器有限状态机基础上，用原始套接字编程的方法实现了thin—TCP／IP协议，并且对嵌入式系统应用层协议进行了设计，简化的协议降低了系统硬件的要求。集成这两种协议的浏览器可访问嵌入式WebServer，并通过提交表格的方式向嵌入式WebServer输入控制信息，在工业自动化和消费电子行业有广泛应用前景。     

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.