可扩展路由器

对可扩展路由器的研究现状进行了综述,并在可扩展路由器体系结构和模型研究的基础上提出其分层模型,将可扩展路由器"自底向顶"地划分为互连结构和数据交换层,路由查找层、标准接口层、分布式操作系统层、分布式路由行为层和单映像管理层6层,并综述了每层的研究进展.最后进行了总结并分析了当前可扩展路由器发展的难点.     

SELinux系统中可扩展强制访问控制的实现

SELinux系统是安全操作系统研究的一个重要研究成果,它为安全操作系统的研究与开发提供了新概念.本文介绍了SELinux系统中可扩展的强制访问控制的实现.     

实时多任务OSQNX4.0性能分析及应用研究

实时多任务ＯＳＱＮＸ４．０是一个具有微内核结构，实时的可扩展的ＰＯＳＩＸ操作系统。本文对ＱＮＸ４．０性能及应用进行综合分析、研究，给出了ＱＮＸ建立用户操作系统的流程图。     

Minix新增系统调用的设计与实现

在分析和研究Minix操作系统时，发现必须增加新的系统调用，本文首先介绍了增加系统调用的必要性，接着分析比较了在基于微内核设计的Minix操作系统上增加系统的调用的各种可能方案，在此基础上，详细描述了中继方案的设计与实现。本文最后给出了新增系统调用的应用。     

主动节点操作系统技术

在介绍主动网概念的基础上，重点研究主动节点操作系统的体系结构，分析了当前几种NodeOS实现方案以及它们存在的问题，并探讨了一种新的节点操作系统模型Janos，以及它的进一步发展和应用。     

操作系统灵活内核技术

在可扩展操作系统研究中存在两种途径,但这两种途径都存在明显的缺陷.在对这些问题研究的基础上,提出了灵活内核技术,它改变以往可扩展操作系统的研究思路,不仅仅支持通过系统扩展软件对系统进行扩展,而且允许动态配置扩展软件的运行位置,从而使得系统在获得了更强扩展特性的同时,在其它一些性能方面也得到了改善.进一步讨论了灵活内核技术实现的一般性问题,并以Elastos操作系统为例进行了说明.     

WinCE下用控制码直接控制打印机的研究

在工控领域中．嵌入式系统应用的越来越广泛,Microsoft WindowsCE（简称WinCE）作为其中的一种,越来越显示出其优越的性能。WinCE是一个紧凑的、高效且可扩展的32位操作系统．适用于各种嵌入系统和产品。它拥有多线程、多任务、确定的实时、完全抢先式优先级的操作系统环境,专门面向只有有限资源的硬件系统,同时,它的模块化设计方式使得系统开发人员和应用开发人员能够为多种多样的产品来定制它．可以选择、组合和配置WinCE的模块和组件来创建用户版的操作系统。而打印作为WinCE在工控领域中应用的一个不可或缺的模块显得越来越重要,同时市面上打印机的种类也更是层出不穷,操作系统一般是通过打印机厂商提供的驱动程序对打印机进行控制。但这些驱动程序广泛的应用于XP系统,对于专用化的嵌入式系统来说．有的厂家不提供相应的打印机驱动程序,针对此种情况,本文提出了一种自己封装驱动程序控制打印机的方法。     

和欣操作系统的灵活内核技术

在可扩展系统研究中存在两种途径,但这两种途径都存在明显的缺陷,灵活内核技术改变以往可扩展操作系统的研究的思路,把构件技术充分地融入到系统体系结构的设计中,使得系统在获得了更强扩展特性的同时在其它一些性能方面也得到了改善。     

SOAP技术及其安全性扩展分析研究

SOAP(Simple Object Access Language,简单对象访问语言)是一种基于XML(eXtensibleMarked Language,可扩展标识语言)的通信协议。自问世以来,因为其能够采用多种程序设计语言在多操作系统下和多种计算机平台上实现,受到社会广泛关注。本文主要介绍了SOAP技术和SOAP数字签名技术,并指出了其广阔的应用前景。     

基于Atmel-View的电子相框实现

Atmel-View是Atmel公司为AT76C120开发板定制的应用程序,它已提供电子相框应用的低层次实现,是一套成熟的可.1扩展的Application解决方案.本文在Atmel-View框架的基础上嵌入Nucleus Plus操作系统,实现各进程模块间的通信和同步.设计实现了一套层次化、结构化、可扩展的电子相框菜单系统,并有效支持了蓝牙模块的应用.     

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.     

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。     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.     

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.     

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.     

Call for papers Special issue on Modeling and control technologies for civil,energy,and power systems

正The control of civil,energy,and power systems presents significant new challenges for modeling and control theory.The purpose of this special issue is to provide a forum for researchers and practical engineers to discuss the recent advances in modeling and control technology development for civil,energy,and power systems.Prospective authors are invited to submit their original contributions with the focus on theory or applications of modeling,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 and promote academic exchange between Chinese and foreign scientists everywhere.