一种基于安全操作系统的防火墙设计与买现

介绍了将Ｂ２安全操作系统与防火墙技术结合,设计了一个包括过滤、应用代理、身份认证和访问控制、完整性相结合的实用防火墙系统。这种防火墙不仅能阻止外部不安全因素蔓延到内部网,而且能解决系统内部安全问题。     

一种网络安全体系的结构

防火墙已经成为人们解决安全问题的一种常用的方法,但是目前的防火墙技术不能有效地解决网络内部的安全问题,并且防火墙的效率问题也越来越多的受到人们的重视。本文提出了结合并行防火墙与入侵检测系统的一种网络安全体系结构。     

一种网络安全体系结构

防火墙已经成为人们解决安全问题的一种常用的方法,但是目前的防火墙技术不能有效地解决网络内部的安全问题,并且防火墙的效率问题也越来越多的受到人们的重视.本文提出了结合并行防火墙与入侵检测系统的一种网络安全体系结构.     

一种混合型防火墙的设计与实现

针对目前中小型企业和事业单位的内部网接入Internet所面临的各种各样的网络安全问题而设计的一种混合型防火墙。该防火墙依据TCP／IP协议的分层结构原理,结合目前Internet网络安全发展的最新技术,从企业网、企业单位信息网和校园网的实际需要出发,借助于目前最流行的一种中小型服务器操作系统－－Linux,设计并实现的一种功能齐全、操作简单、兼容性好而且易于扩展的混合型防火墙。     

网络安全防护体系的研究

随着网络感染病毒、遭受攻击的速度日益加快,以及网络受到攻击做出响应的时间却越来越滞后.解决这一矛盾,传统的防火墙或入侵检测技术显得力不从心,本文在目前的入侵检测,防火墙研究基础上,提出了一种网络安全综合解决方案,该体系结合了另一种主动防御的安全技术-蜜罐,它能够在网络防火墙、入侵检测系统等安全措施的配合下,弥补原有安全防御的不足,抵御外部和内部的攻击,增强网络安全性能.     

Windows2000主机防火墙的设计

针对网络内部的安全问题，对边界防火墙的不足进行了分析与研究，对主机防火墙工作原理和关键技术进行探讨研究，并结合Windows 2000操作系统给出一种设计方案。     

安全WEB隧道技术

当前 ｉｎｔｅｒｎｅｔ应用中,存在着企业组织的网络边界和防火墙的范围不完全一致的问题。企业的职员希望能从防火墙外部访问内部的ＷＥＢ服务,就如同在内部网中访问一样的简便和安全,同时,防火墙能够执行充分的访问控制,记录和监听功能。本文讨论的安全ＷＥＢ隧道技术可以用于解决这个问题。     

安全WEB隧道技术

当前的Ｉｎｔｅｒｎｅｔ应用中存在着企业组织的网络边界和防火墙的范围不完全一致的问题。企业的职员希望能从防火墙外部访问内部的 ＷＥＢ服务,就如同在内部网中访问一样的简便和安全,同时,防火墙能够执行充分的访问控制,记录和监听功能。文中讨论的安全 ＷＥＢ隧道技术就用于解决这个问题。     

基于Kerberos分布式防火墙技术研究

随着计算机网络技术的迅猛发展和Internet/Intranet用户数量的激增,以及新型网络服务的研究、实施和应用,计算机网络安全问题日益突出.使得计算机安全问题成为影响计算机互连网络进一步发展的一个重要因素.以往采用的安全保护中使用的最多的是传统的防火墙机制,可是随着网络技术的不断发展,传统的防火墙已经逐渐不能,满足安全的需要.本文针对传统防火墙所带来的问题,提出了一种基于Kerberos认证的分布式防火墙的新型体系结构,在保留传统防火墙优点的基础上,以Kerberos协议为主要基础,综合网络安全软件算法合理运用防火墙相关知识,实现内部网安全分布式防火墙系统,解决了传统防火墙的安全隐患.为众多内部网络用户的需要重点保护的网络资源提供一个可管理的、分布式的安全网络环境.     

基于安全数据结构的防火墙

一、引言防火墙技术是一种网络安全技术。它是在受保护网与外部网之间构造一个保护层,把攻击者挡在受保护网的外面。这种技术强制所有出入内外网的数据流都必须经过此安全系统。它通过监测、限制或更改跨越防火墙的数据流,尽可能地对外部网络屏蔽有关受保护网络的信息和结构来实现对网络的安全保护。但是如果一个黑客利用防火墙本身操作系统的漏洞来对此防火墙进行破坏,例如:修改、替代或删除防火墙的模     

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.     

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     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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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