基于嵌入式TCP/IP的远程GPRS控制终端的设计与实现

介绍了基于8位单片机的嵌入式TCP／IP的远程无线控制终端的设计与实现．描述了基于GPRS网的数据传输过程、嵌入式实时操作系统RTX51以及嵌入式TCP／IP协议栈简化的思路，并着重阐述了控制终端的技术实现．     

嵌入精简型TCP/IP协议栈的GPRS终端实现

介绍GPRS无线数据传输系统结构,论述基于MSP430单片机和Simens公司的MC35模块的GPRS无线终端的实现,重点阐述了GPRS终端中精简型TCP／IP协议栈的嵌入,根据GPRS数传需要主要嵌入了PPP、IP、TCP、UDP、DNS等协议,最后叙述了数据透传模式下的系统软件设计。     

TCP／IP协议在无线测控网中的应用

介绍了TCP／IP协议和无线测控网,编写了基于TCP／IP协议的客户端程序。该程序运用TCP／IP协议成功地与无线测控网进行了互联和通信,获取了车辆的位置信息。     

基于嵌入式Linux的无线文件传输系统的实现

对无线文件传输系统进行了设计,采用无线通信技术、计算机技术研制了无线文件发送终端,采用嵌入式微处理器、无线通信模块等电路设计了无线文件发送终端的硬件,构建了嵌入式Linux操作系统平台,移植了PPP协议,采用多进程开发了应用程序,应用TCP/IP协议和PPP协议设计了CDMA无线通信软件,并进行了调试和实验运行。在原有无线传输模块的基础上进行研发,根据无线网络特性进行系统优化,将无线传输速度提升到原来的4倍,实现了文件无线发送的功能。     

SSL协议分析及应用

SSL协议是在TCP／IP的IP套接层的安全协议,以补充TCP／IP协议安全的不足。SSL协议在网上银行、电子商务中得到广泛地应用,主要解决了数据的安全性、保密性。介绍了SSL协议的原理,给出了在客户端和服务器程序中如何用OpenSSL实现SSL协议。     

MSC1210的GPRS无线通信系统设计

以GSM网络为数据无线传输网络,设计一个基于GPRS数据传输的通信终端。通过在单片机系统中嵌入PPP和TCP／IP协议,实现端到端的GPRS分组业务功能。文中还详细介绍MSC1210单片机与GPRS模块通信接口的硬件和软件实现。     

基于GPRS无线通信的嵌入式TCP/IP协议栈的实现

介绍了基于西门子公司MC39i模块的GPRS无线终端的实现,重点阐述了PC机上PPP协议中的LCP、 PAP、 IPCP协议以及微型TCP/IP协议栈TinyTCP的实现过程,并且叙述了通信协议中的校验问题.     

一个宽带无线IP网络与Internet网络的互连

当前，在Internet中实现移动终端的无缝接入巴成为Internet的研究热点之一．本文简要介绍了一个基于WCDMA技术的宽带无线IP网络及其拓扑结构；增加和定义了一个无线IP子层协议及功能；详细描述了无线IP子层的设计、无线TCP连接和自适应无线拥塞控制算法的实现．实验结果表明任意一个无线终端都能够利用Ping、IE、FTP、Emai1、Telnet等软件稳定有效地访问Internet．     

ZigBee无线传感网络与IP网络的网关设计

在zigBee协议栈和TCP／IP协议栈的基础上,通过分析zigBee网络与IP网络的Zigl3ee网关的逻辑模型,根据ARP协议提出了ZigBee路由表控制层,实现了zigBee协议与TCP／IP协议的转换。Zigbee网关使Zigbee网络和IP网络融为一体,实现了无线传感网与互联网的数字信息交互与共享。     

WAP在TCP／IP网络上的协议模拟方法

无线应用协议WAP是实现移动通信设备与Internet网络集成的关键技术和研究热点。本文在分析WAP协议栈和应用支持模型的基础上,阐述了基于TCP／IP平台的WSP／WTP协议模拟原理及方法,给出了节省无线传输带宽的WSP压缩编码方法,并探讨了WAP技术研究的新动向。本文所提出的集成化协议模拟思想,通过接口函数、编解码器函数及其典型过程得到了验证。     

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.