DSA数字签名技术在公文交换中的应用与设计

随着信息技术的不断发展，以及数字签名法律的制订，数字签名在各级政府的电子政务中逐步开始使用。为了实现电子公文的数字签名，本文首先对DSA算法和数字签名技术进行了分析，然后利用微软.NET的C#开发工具实现了DSA数字签名技术，保证了电子公文流转的安全性。     

在电子政务系统中用Java实现数字签名

本文介绍了数字签名技术在电子政务中的应用。传统的数字签名技术都是基于非对称的密码算法，原文以明文的方式传送，在这种方式下，原文的安全性受到了极大的威胁。本文提出了基于混合密钥的数字签名技术以及该技术在Java中的实现，通过这种方式，不仅实现了数字签名，而且还能保证原文的机密性。     

数字签名技术在网税系统中的应用探讨

简要介绍了数字签名技术，分析了数字签名技术在税务网税系统应用中的作用，探讨了数字签名在网税系统中的设计原则和实现方式。     

混合密钥的数字签名技术在Java中的实现

当今的信息时代，数据的安全保密性非常重要，而数字签名技术在保证数据的完整性、真实性和不可抵赖性方面起着重要的作用。本文介绍了数字签名技术的基础上提出了混合密钥的数字签名技术以及该技术在Java中的实现．通过这种方式不仅实现了数字签名、保证原文的机密性，而且大大提高了系统的效率.     

数字签名技术在政府公文处理系统中的应用

概述了数字签名技术的原理，并介绍了数字签名技术在政府公文处理系统中的应用，最后详细介绍了用Java语言实现数字签名的方法。     

基于数字签名的数据自动上载的研究与实现

数字签名是近几年发展起来的用于保证网络数据传输安全的一项实用技术。介 绍了数字签名的基本原理，详细讨论了利用数字签名技术进行数据自动上载的实现策略，并 给出了基于数字签名技术实现的Bookmark（书签）自动上载实例。     

基于群体签名的安全通信

随着Internet的发展，特别在电子商务领域，群体数字签名技术得到了广泛应用。该文介绍了数字签名技术、公开密钥加密体制以及群体式数字签名方法，并对文献[1]中多人签名的方案进行了改进，设计了群体签名一对一安全通信实现方案。     

混合密钥的数字签名技术在Java中的实现

当今的信息时代,数据的安全保密性非常重要,而数字签名技术在保证数据的完整性、真实性和不可抵赖性方面起着重要的作用。本文介绍了数字签名技术的基础上提出了混合密钥的数字签名技术以及该技术在Java中的实现,通过这种方式不仅实现了数字签名、保证原文的机密性,而且大大提高了系统的效率。     

基于零知识证明的XML数字签名方案

数字签名用于保证网络问传送文档的完整性，机密性和不可否认性。XML与数字签名的结合比传统的数字签名更加优越，文章提出了一种用Java实现的基于零知识证明的XML数字签名方案，描述了用数字签名技术对XML文档进行签名及验证的过程。     

数字签名技术及其在OA中的应用

数字签名是互联网中应用十分广泛的一种信息安全技术，用来保证信息在网络传输过程中的完整性以及不可否认性。本文阐述了数字签名的概念和功能，并在办公自动化系统中，实现了公文流转文件的数字签名和签名校验。     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

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.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate