RSA数字签名技术在电子公文流转中的应用

电子公文交换是电子政府活动的重要内容，但是电子公文已不能用传统的手工签名和盖章来确定公文的真伪。为了鉴定公文收发双方的身份，必须采用网上签名——数字签名技术。首先对数字签名技术和RSA算法进行了分析，然后对电子公文的数字签名进行了设计，最后用C#实现了该技术，最终解决了电子公文流转的安全问题。     

基于密码技术及水印技术的电子公文交换系统

针对电子公文交换过程中信息的完整性、机密性、可追溯性要求,简介密码技术、数字水印技术、PKI结构和电子印章技术,及这些技术的一些典型实现算法.基于这些技术,提出一个电子公文交换系统方案,详细介绍系统的结构以及流程.安全分析表明,以上技术的综合运用为电子公文交换提供了一个有效的安全保障.     

基于XML消息中间件的公文传递模型研究

我国政务系统中缺乏统一的接口与平台，使得数据共享与访问困难。文章针对电子公文系统的交换特征与传递规律，结合消息中问件技术，提出了一种基于消息中间件的松耦合电子公文传递解决方案，以解决在异构环境下正确、高效地传递和交换电子公文的问题。     

XML安全技术在电子公文交换系统中的应用

为实现电子公文数据格式统一及电子公文安全交换的目标,基于XML语言和XML安全技术设计了一种通用电子公文交换系统.采用XML作为电子公文的数据格式,给出了电子公文的XML模式定义;应用XML签名技术保障电子公文的在传输过程中的完整性,应用XML加密技术保障电子公文在本地存储和在传输过程中的机密性.有效地解决了和其它电子政务系统的互联问题及电子公文系统的安全问题.     

安全电子公文系统基于PKI技术的电子公文解决方案

随着电子公文的广泛应用．如何解决发送或者转发过程中的安全问题，已被提上行政日程。在本文中．作者根据多年来的电子政务和信息安全实践经验，提出了基于PKI技术的电子公文解决方案——安全电子公文系统，供广大读者参考与学习。     

基于XML的电子公文交换格式

分析了面向电子政务的可交换电子公文格式的需求，并基于此提出了eDocXML电子公文交换格式，给出了该规范的结构和用法。针对基于eDocXML的电子公文的打开、保存、显现、交换等问题进行了讨论，并给出了实现的原型。     

基于电子印章的公文安全认证系统

针对电子公文在存储和传输中的安全认证需求,对电子印章系统设计中的关键问题进行了研究.综合数字签名技术和双重数字水印技术的优点,基于现有CA系统提出一种电子印章系统构建方案,实现了对电子公文的内容认证和盖章实体的身份认证,同时继承了传统印章的形象性和权威性.然后基于Word开发原型系统,并构造典型攻击进行实例测试.实验结果表明,该系统能够满足电子公文认证的安全需求.     

基于IBE的跨网络电子公文安全交换平台

针对目前电子政务中不同部门间公文数据交流的困难,设计了一个跨网络的政府电子公文交换平台的方案,并采用基于身份的密码体制和椭圆曲线加密算法,提出了一种基于身份的电子公文安全交换模型,为实现跨网络的电子公文自由流转提供安全保障。应用实践表明,该安全平台方案是切实可行且安全高效的。     

基于密级标志技术的电子公文安全传输支撑平台设计

为提高电子公文传输系统的安全性,保障不同密级的电子公文在传输交换过程的安全,本文对密级标志关键技术进行研究,利用加密和内容混淆等技术手段将密级标识与电子公文进行绑定,设计了基于密级标志的电子公文安全传输支撑平台。平台经过应用和测试,实现了对电子公文进行"标志、鉴别、管控"的目标,增强了电子公文传输系统的安全性。     

用XML实现电子公文的签名和加密

XML是一种结构化的标记语言，XML签名和加密是最近才通过的XML安全标准。通过对电子公文的签名和加密方案的分析比较，提出把安全XML用于电子公文的思想，给出了电子公文处理的系统框架，详细描述了公文的签名和验证的软件实现技术。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。