高性能的PCMCIA数据加密卡的设计与实现

随着笔记本电脑的不断普及,符合PCMCIA标准接口的PC卡被广泛地应用在各个领域。同时,由于数据安全日益得到重视,对笔记本电脑硬盘中的数据进行加密成为一种迫切需要。该文在PCMCIA接口规范的基础上设计了一种高性能的PCMCIA数据加密卡,重点介绍了该系统的结构设计,并给出了硬件的实现方案。该系统通过在FPGA上的仿真和在Windows9x环境下的测试,完全符合PCMCIA的设计规范要求,可以对计算机的数据进行有效的加密保护;并且由于该系统的设计考虑了VLSI的特性,易于ASIC的实现。     

一种应用用IC卡数据加密的Rijndael改进算法

经对Rijndael算法研究发现，其密文长度通常大于明文长度，且运算时间复杂度较高，不便于对IC卡的数据进行加密。按照IC卡数据加密的实际需求，提出了一种基于Rijndael算法的改进算法。改进的新算法通过用动态密码对明文修补，实现密文与明文的长度相同；通过改进密钥扩展算法，保障新算法安全；通过减少加密轮次，降低其时间复杂度，从而使其在IC卡数据加密系统中的应用可行。     

基于IP复用的硬盘加密卡的设计与实现

基于IP复用方法实现的硬盘加密卡,是一种用于保障数据存储安全的硬件加密装置。论文通过分析与测试,证明该加密卡能在不影响软件使用和对用户透明的前提下,对硬盘中的数据进行全面的实时加密,为用户数据的安全存储提供可靠的保证。     

一种应用于IC卡数据加密的Rijndael改进算法

经对Rijndael算法研究发现,其密文长度通常大于明文长度,且运算时间复杂度较高,不便于对IC卡的数据进行加密。按照IC卡数据加密的实际需求,提出了一种基于Rijndael算法的改进算法。改进的新算法通过用动态密码对明文修补,实现密文与明文的长度相同;通过改进密鈅扩展算法,保障新算法安全;通过减少加密轮次,降低其时间复杂度,从而使其在IC卡数据加密系统中的应用可行。     

基于DSP-FPGA的网络传输信道加密系统

数据加密技术是网络安全的基础,是网络中最基本的安全技术.本文对基于DSP-FPGA的加密卡进行了论述,对伪随机加密算法进行了分析,提出了一种采用TMS320C54X和FPGA实现网络传输数据加密系统的设计方案.     

一种安全的IC卡数据加密算法及其应用

讨论了IC卡系统的安全问题,设计了一种基于DES算法的三重加密模式,分析了其安全性,并讨论了该算法在医疗保险IC卡系统中的成功应用。     

基于DSP的PC加密卡的实现

Rijndael加密算法是高级加密标准（AES）的最终获胜的候选算法。本文对基于DSP技术的PC卡进行了论述，对Rijndael加密算法进行了分析，提出了一种采用TMS320C54X和PCI接口芯片实现加密卡的设计方案。     

基于虚拟磁盘的文件加密方法

文件加密存储是保证机密数据不被窃取或篡改的有效方法。介绍了一种基于虚拟磁盘的文件加密方法，其思想是利用Windows WDM设备驱动程序技术，创建虚拟磁盘分区，在响应虚拟磁盘的I／O请求的过程中，进行实时的数据加／解密，并采用USB智能卡进行用户身份认证及密钥管理，从而保证存储在虚拟磁盘中的文件的安全性。实验证明，该方法是一种安全、高效、易用的文件加密存储解决方案。     

Linux下加密卡驱动程序的开发与性能分析

在分析了Linux驱动程序结构的基础卜，洋细介绍了一种Linux下加密卡驱动程序的开发过程，在对比分析加密卡性能的基础上，提出了在驱动程序中封装加密算法的软硬件结合方式来提高加密卡的性能。     

数据加密技术及用VB6.0实现数据加密算法

数据加密是保证网络数据信息安全的一种重要技术手段，本文介绍了现代密码学中两个经典密码算法（DES和RSA）的数据加密技术，接着提出了一种对汉字、文本加密的方法，最后给出了采用该加密方法，用VB6．0实现数据加密的过程。     

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。     

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。     

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.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.