基于CLIENT／SERVER的分布式远程访问服务安全管理系统

越来越多的远程用户通过ＭＯＤＥＭ拨号上网，同时也带来了更加严重的安全问题和管理问题。本文详细讨论了远程访问用户的安全管理、身份验证、访问授权和记费管理，并描述了一 种在ＣＬＩＥＮＴ／ＳＥＲＶＥＲ架构下的分布式安全管理系统，说明了它的协议及其实现方法，最后给出了实便。     

工程图纸的处理和光盘管理

本文介绍了一个工程图纸光盘管理与设计系统－ＳＥＡＳ，讨论了它的数据结构、检索技术及目前的光盘技术等，并介绍了ＳＥＡＳ提供的加工处理图纸档案以及档案库管理等功能。ＳＥＡＳ为档案的现代化管理提供了支持。     

利用扩充内存在实现多幅图象的快速存储

文中讨论了８０２８６以上微机扩充内存的管理及使用方法，并通过对ＥＭＭ３８６．ＥＸＥ的调用，实现了多幅图象的快速存储。     

利用扩充内存实现多幅图象的快速存储

本文讨论了８０２８６以上微机扩充内存的管理及使用方法，并通过对ＥＭＭ３８６．ＥＸＥ的调用，实现了多幅图象的快速存储     

制造质量管理数据标准化策略及数据交换接口

制造质量管理信息是制造过程中非常重要的信息，其数据模型标准化是信息集成的关键．本文详细论述了基于ＳＴＥＰ方法学和ＩＳＯ９０００标准的制造质量管理数据的标准化策略，并给出通过对象树图实现ＩＤＥ－ＦＩＸ和ＥＸＰＲＥＳＳ间模型转换的一种数据交通接口     

扩充扩展内存和上部内存的管理原理与使用方法

本文清晰地阐明了上部内存、扩充内存和扩展内存等概念，并通过对ＸＭＳ，ＥＭＳ和ＶＣＰＩ等规范以及ＥＭＭ３８６．ＥＸＥ等内存管理器的分析。介绍了在高版本ＤＯＳ上，上述几种内存的管理原理和使用方法。     

速达为中小企业推出“营养套餐”

近日，速达软件在广州推出“Ｅ２—企业引擎”并启动ＰＳＰ合作模式。这是速达为中型企业炮制的一道综合产品以及渠道的“实用大餐”。为进入ＷＴＯ以后众多国内与国际企业接轨，吸取国际先进企业管理经验，提供了从管理思想和专业服务的营养配方。 Ｅ２—企业引擎涵盖了采购、销售、存货、生产管理、客户关系、经营分析、财务管理、分支机构远程管理八大系统，并针对工业企业管理特点，细分为１７种管理模块，在每一个管理模块中又有多个管理细则，从不同方面、不同角度帮助企业实现企业财务内部控制。另外，作为企业的神经系统，ＥＺ能够…     

CERNET中国教育和科研计算机网

ＣＥＲＮＥＴ中国教育和科研计算机网中国教育和科研计算机网（简称ＣＥＲＮＥＴ）是国家教育委员会管理的覆盖全国的学术性计算机网络。ＣＥＲＮＥＴ的建网宗旨是利用先进实用的计算机技术和网络通信技术，实现其接入网络之间的计算机联网、信息资源共享，并与Ｉｎｔｅｒ...     

EIS信息组织的探讨

本文以超文本为重点，结合三峡物资管理ＥＩＳ的开发实践，探讨了开发ＥＩＳ（高层管理信息系统）的信息组织方式，给出了一般ＥＩＳ信息组织的框架，并借助人工智能中语义网络的概念对ＥＩＳ环境下的超文本结构进行了分析。     

新闻纵横

上海汽车工业销售总公司完善计算机管理系统 上海汽车工业销售总公司为了使计算机管理系统更加完善，近期准备将ＥＲＰ系统和办公自动化系统进行动态连接，使ＥＲＰ系统中的某些报批工作自动地在办公自动化系统中流转，并将结果返回到ＥＲＰ系统中。据悉，实施ＥＲＰ系统后，ＥＲＰ系统的一些数据结果和办公自动化系统的一些数据信息能相互传递，并且通过实现业务管理和事务流程管理的结合，对企业工作实施全方位紧密有效的管理，进一步提高管理的层次和境界。承德广电用上ＡＴＭ接入设备 承德广电日前选用ＡＴＭ接入产品用于该地区的广电数…     

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.     

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.     

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.     

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