基于标识的名字空间及对移动通信的支持研究

当今互联网在安全性和移动性方面存在着严重问题,IP地址同时用作用户的身份标识和位置标识,不能很好地解决主机的移动、网络安全;针对此问题,提出了许多方案来改进Internet的名字空间和对移动性、安全性支持;对目前几种典型的基于身份标识和位置标识相分离的名字空间改进方案对移动性、安全性支持进行了对比研究,同时提出了一种基于标识的移动通信机制。     

基于标志的名字空间及其移动性管理研究*

随着Internet的迅速发展,网络名字空间结构及对移动性、安全性的支持面临着新的挑战,IP地址同时用做用户的身份标志和位置标志,语义过载,不能很好地解决主机的移动、多宿主、动态IP地址变化、网络安全。针对此问题,研究者提出了许多方案来改进Internet的名字空间和对移动性、安全性的支持。分析了当前Internet名字空间及其对移动性支持存在的问题,并对目前几种基于身份标志和位置标志相分离的名字空间改进方案对移动性、安全性支持进行了对比研究。     

基于标识支持的移动通信技术

目前互联网在移动性和安全性方面存在缺陷,IP地址同时作为用户的身份标识和位置标识,导致语义过载.该文分析几种典型的基于身份标识和位置标识相分离的名字空间改进方案,比较其对移动性、安全性的支持,提出一种新的基于一体化网络的移动通信机制.     

基于标识支持的移动通信技术

目前互联网在移动性和安全性方面存在缺陷,IP地址同时作为用户的身份标识和位置标识,导致语义过载。该文分析几种典型的基于身份标识和位置标识相分离的名字空间改进方案,比较其对移动性、安全性的支持,提出一种新的基于一体化网络的移动通信机制。     

兼容多种标识的新型根区管理技术

现有互联网域名及工业互联网标识体系根区的管理模式是一种中心化的架构,会形成一个绝对权威中心控制所有数据,权力的过于集中会存在权力滥用、缺乏监管等风险.针对这个问题,分析了互联网域名及工业互联网标识解析体系中根区顶级域或顶级节点当前的管理模式,并对这种中心化的模式进行改进,提出了一种新的兼容多种标识的根区管理技术.首先,利用区块链分布式存储、难以篡改等特性,根节点之间通过准入机制构建平等共治的联盟链,然后选择安全高效的共识机制,设计合理的数据结构,对根区数据进行注册、更新和注销,从而使顶级域或顶级节点共同参与维护根区数据,实现根区的去中心化管理,保证根区数据的一致性与安全性.     

互联网资源命名寻址技术综述*

介绍了几种寻址技术的基本概念和相互关系,并从标志方案解析方案、名字空间、可扩展性等方面分析比较几种寻址技术的优缺点,最后对互联网资源命名寻址技术的未来发展趋势进行了展望。     

标识映射服务系统的研究与结构

基于分离主机的身份标识和路由标识地址空间来重新设计互联网体系结构,解决当前计算机网络面临来自可扩展性、移动性、多宿主等方面的挑战,在位置与标识分离的思想中,标识映射服务系统的研究又是事关成败的关键。     

移动互联网安全现状及对策研究

智能手机的普及和移动应用的日益丰富带动了移动互联网业务的快速发展,移动社交、移动支付等各种应用带来了便捷的同时,移动互联网的安全问题也不容忽视.移动终端、通信网络、内容应用都存在着各种不同的安全问题.在总结当前移动互联网的安全现状的基础上,分析了其目前面临的安全问题,提出了移动互联网的安全模型,并对终端用户提出防护建议.     

互联网地址安全体系与关键技术

当前,互联网体系结构不具备地址真实性验证机制,源地址伪造与路由地址前缀欺骗造成了极大危害.解决地址安全问题、构建真实可信的互联网环境,已成为亟待解决的重要课题.地址的真实性是互联网可信的基础和前提.针对这些问题,研究者们从不同角度提出了很多解决方案.首先,该文介绍了地址的概念及其欺骗现状,分析了地址安全的含义,并从研究体系、实现机制以及关键技术这3个维度,对地址安全研究思路进行了归纳分析.然后,对典型地址安全方案的性能指标进行了总结.最后,给出了一个地址与标识通用实验管理平台的设想,基于该平台,可以为不同的地址标识方案提供统一的部署实验环境.     

未来互联网体系结构中的内生安全研究

未来互联网体系结构试图通过其内生安全特性解决目前互联网中的安全问题。新型的未来互联网体系结构命名空间普遍使用了具备自认证能力的网络标识支持网络的内生安全,但目前的方案不能将用户标识符、网络标识符、公钥三者在脱离PKI的情况下实现同时绑定。本文提出了基于组合公钥密码体制的自认证标识(SCI-CPK)命名方案,可用于未来互联网体系结构命名空间中标识安全绑定,并给出了在未来互联网体系结构XIA、MobilityFirst和NDN中支持实体鉴别的应用方法。分析表明,SCI-CPK方案能够支持未来互联网中泛在互联和泛在移动场景下的大规模实体身份和地址鉴别。     

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