基于虚拟化的系统安全增强及显卡透传研究

针对个人终端操作系统安全问题,提出一种基于系统虚拟化技术的操作系统安全增强模型,研究提高该模型下KVM虚拟机显示性能的显卡透传技术。实验结果表明,显卡透传技术能够克服虚拟机客户操作系统的显示性能缺陷,使得客户机操作系统能够像真实操作系统一样满足图形显示与处理的应用,适用于终端安全领域。     

基于云计算的高校实验室虚拟化建设及应用

旨在在高校实验室管理中实现虚拟化的信息管理,提高高校实验室虚拟化管理的效率.通过在云计算平台上建设虚拟化的高校实验室,基于云计算高校虚拟化建设不仅仅缓解了紧张的经费,同时也降低了能耗,实现了简单的管理和维护,提高了工作效率,实现了资源共享.通过创建个性化的云桌面,结合虚拟资源平台进行资源的整合,提供通畅的云计算交流平台.结果表明,不仅仅实现了虚拟化的操作系统,同时有着高性能本地缓存的优势,多服务器负载均衡,客户机工作状态很好.     

云计算中的虚拟化关键技术及其安全防御研究

虚拟化技术是云计算的核心技术之一,已广泛应用于很多领域。基于此,文章首先分析了虚拟化技术的概念,其次分析了云计算中的虚拟化关键技术,最后针对云计算中虚拟化存在的安全问题,提出全面的安全防御建设思路。     

Xen硬件虚拟化下一种客户机进程追踪技术

Xen硬件虚拟化(HVM)是运行于Xen Hypervisor上, 无需修改客户操作系统内核便可实现虚拟化的技术. 但Xen HVM在提升用户体验的同时, 也造成了VMM对客户机的干涉和理解程度的降低, 丧失了进程粒度级别的管理能力. 鉴于此, 提出了一种针对Xen HVM客户机的轻量级进程追踪技术原型Xen HPT. 借助VMM掌握的客户机ESP寄存器信息, 从客户机外部隐式捕获其实时进程信息. 实验证明, 该技术是一种追踪客户机进程的有效方法.     

云计算中关键虚拟化技术及其安全防御机制

随着信息化的发展，云计算技术正被各领域广泛应用，政府、企业都在尝试建立自己的“云”，云计算环境下能实现资源高共享、灵活供给、快速交付和弹性扩展。然而，虚拟化技术作为云计算的关键技术，是建立“云”服务与应用的基础。本文对虚拟化中Hypervisor技术、计算虚拟化（CPU虚拟化、内存虚拟化、I/O虚拟化）、存储虚拟化、网络虚拟化（虚拟交换机、VXLAN技术）等内容进行深入分析，指出虚拟化给云平台带来的主要安全问题，从安全防御建设思路、构建分域控制机制、安全防御设计、安全防御措施（包括虚拟化安全、Hypervisor技安全、VM安全、虚拟网络安全）等角度针对性地提出安全防御机制，以确保云计算中虚拟化平台能够提供安全可靠的服务。     

面向云计算虚拟化的信息安全防护策略分析

虚拟化技术属于云计算中的核心技术，在云计算应用中发挥重要作用。通过虚拟化技术的应用能够实现网络按需调用集中共享资源，而在此项技术应用环节引入新的信息安全风险。如何做好信息安全防护策略，已成为云计算虚拟化技术发展需要重点关注的问题。基于此，从云计算和虚拟化技术相关概述入手，分析云计算虚拟化的安全威胁，提出面向云计算虚拟化的信息安全防护策略，以期为相关人员提供参考借鉴，充分发挥虚拟化技术的应用价值，提升信息安全防护水平。     

基于VT-x的处理器模式转换机制研究

为降低虚拟化环境中处理器模式转换带来的开销,研究了基于VT-x技术的处理器模式转换机制.根据客户机操作系统在不同阶段的运行状态,分析了相应的处理器模式转换过程.采用客户机操作系统最小等待的基本思想,结合VT-x处理器提供的虚拟机扩展功能,设计出了处理器模式转换的整体流程,分别构造出满足客户机操作系统需求的实模式和保护模式处理器环境,模拟了客户机操作系统的执行过程以及虚拟机监控器对相关事件的处理.实验结果表明,VT-x技术可以有效辅助处理器模式转换,简化虚拟机监控器设计.     

服务器虚拟化安全机制研究

服务器虚拟化技术立足于操作系统和CPU提供的权限控制,由工作在底层的虚拟机监控器为客户机提供资源的实时监控、授权访问、追踪审计等安全功能;同时虚拟机监控器自身采用可信计算技术,实现动态的可信认证;配合其他安全策略规划,服务器虚拟化为客户机提供更好的私密性和完整性保护.     

云计算环境中虚拟化技术的研究探讨

在云计算环境中,虚拟化技术是最为核心的技术,发挥着非常关键的作用。本文结合云计算和虚拟化技术的概念,从应用虚拟化和虚拟化技术的安全问题出发,对云计算环境中的虚拟化技术进行了研究和探讨。     

虚拟化与操作系统辨析

随着近10年的复兴,虚拟化技术已成为业界和学界的关注热点。本文从操作系统技术的角度观察和分析虚拟化技术的发展,首先深入讨论虚拟化和操作系统的内涵,并就目前针对该两种技术之间的学术争辩进行分析,本文认为虚拟化技术和操作系统技术本质上互有异同,可相互借鉴和融合。本文就虚拟化和操作系统在若干重要技术领域中各自的技术特点进行详细阐述,包括动态二进制翻译、名字空间虚拟化、资源管理机制、运行时状态保存和回溯机制、系统安全和可信增强等,探讨了虚拟化和操作系统的技术融合趋势。本文认为虚拟化技术的发展为操作系统技术变革带来了新的挑战和机遇。     

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.     

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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