可重构安全承载网络构建与重构算法研究

现有互联网安全体系结构僵化且效率低下。基于“以可变的有限节点资源支持多样安全应用需求、以内置的安全结构提供多级安全保障”这一认识,避免单一追求高安全等级或高服务质量的简单模式,提供更高的灵活性和可扩展性,提出一种基于重构的安全业务—服务—构件模型,并在此基础上给出可重构网络安全体系的初步构想和具有多级安全保障的可重构安全承载网络结构,给出了可重构安全承载网络构建及重构算法。仿真结果验证了算法的有效性和性能。     

基于信息流的网络动态重构方法

针对已有的网络动态重构方法在安全性、可靠性以及对原有网络性能的不良影响等方面的缺陷，该文提出了一种基于信息流的具有网络性能保证和信息传输保证的网络动态重构方法及其算法，通过这种方法实现的网络动态重构能够保证重要的信息安全到达目的地，也能通过这种方法使信息流分流，在很大程度上保证了总体网络的传输性能。     

网络系统可重构性分析模型研究

当前信息网络正面临各种挑战,具有动态适应能力的可重构网络系统正成为人们关注的焦点.首先提出网络系统可重构性的概念,揭示了其鲁棒性、演化性和生存性的基本属性.通过建立系统状态的分层模型,在对系统鲁棒行为、演化行为和生存行为进行刻画的基础上,提出一种基于FSM的网络系统可重构性分析模型.为实现网络可重构性的量化分析,以网络拓扑可重构性度量为例进行研究,提出了量化的可重构性度量指标.可重构性的量化指标使得可重构性分析模型具有了量化分析的应用前景.     

基于匹配策略的安全协议重构分析

可重构安全协议对提高安全系统的灵活性和适应能力具有重要意义,它可根据具体上下文环境进行配置、移植,极大增强了系统的安全性,目前基于软件构件的协议重构方法无法满足安全协议对安全性和计算性的特殊要求.针对安全协议的安全性和高密度计算特性,提出了一种针对现有资源选择重构元的解决方法,给出协议可重构元匹配和基于QoS的重构元质量满意度的协议重构选择算法,使系统可以尽快按照重构协议需求选择满意的可重构元.通过实例说明该方法的执行过程,应用结果表明该方法能够有效提高重构效率和重构准确度.     

软件重构及设计模式在摄像头阅卷系统中的应用研究

首先设计并实现一个基于摄像头的阅卷系统,该系统由试卷获取、灰度化、二值化、畸变变换、倾斜校正、图像定位和识别等图像处理流程组成。然后以此为依据,通过对重构技术及设计模式原则和方法的系统研究,对该系统框架进行优化和重构。本文充分参照现有的设计模式,通过重构技术,改善现有代码的质量,增加系统的可维护性和可复用性。     

FPGA的可重构测控系统应用设计

可重构器件技术的发展和测控系统结构模式的通用化是实现可重构测控系统的前提。通过对常规计算机测控系统存在的问题、结构模式和多任务特征以及可重构器件技术发展的分析,提出基于FPGA器件设计可重构测控系统平台的设想,对可重构测控系统设计原则、硬件结构单元设计和软件重构方法进行了分析,并给出应用于雷达信号实时侦测的基于CPCI总线的可重构测控系统硬件设计的实例。     

可重构异构系统结构研究

可重构异构系统是由通用微处理器、可重构模块、专用ASIC、IO接口等资源构成的异构并行处理系统,文中提出的可重构异构系统结构融合了不同的计算资源,使系统中的某些资源能够很大限度地满足某种应用的模式和处理要求.系统中可重构模块的硬件功能可以通过在线重构技术加以改变,各模块之间的互连关系可通过重构互连控制器调节和仲裁.这种可变性使计算系统能适应更大范围的应用需求,向一体化和高性能的方向发展.     

可重构路由单元软件体系结构的研究与实现*

对可重构路由单元中软件体系结构进行了初步探讨,提出了支持多网融合环境下的可重构软件架构的模型、实现方案并对关键技术进行了研究。该技术方案可保证在现有的多网融合的运行环境中实现标准化的功能扩展,使得路由单元的服务支持可重构特性。     

异构重构计算系统应用任务调度的性能分析

异构重构计算是目前高性能计算的研究热点.由于应用任务的异构性,以及体系结构的可重构性,导致异构重构计算的性能分析非常困难,现有的并行计算性能分析方法不再适用.本文提出一种基于应用任务调度的性能分析方法,该方法以异构重构计算系统模型和应用任务模型为基础,利用异构匹配、重构耦合矩阵,实现应用任务和处理部件的优化选择和耦合匹配,通过调度算法求出应用任务在异构重构计算系统中的完成时间,并进行了实例分析.     

可重构网络系统的模型及体系结构

当前信息网络正面临着各种新挑战,具有较强动态适应能力的可重构网络系统正成为人们关注的焦点.本文提出一种网络系统重构的框架模型和可重构网络系统中的主动重构策略,并在此基础上建立了分面立体型的可重构网络系统的体系结构.该体系结构融合了网络主动防御和灾难恢复的关键技术,设置了独立的控制管理面,具有更好的可控、可管和适应性,能够为网络系统的重构提供基础的、体系结构级的支持.     

Interactive Reconfiguration of Urban Layouts

The layout of an urban space is a complex collection of man-made structures arranged in parcels, city blocks, and neighborhoods. An editor for interactively reconfiguring city layouts exploits geographical information system (GIS) data and provides tools to expand, scale, replace, and move parcels and blocks while efficiently exploiting their connectivity and zoning. The ability to create, extend, and change a model of a large-scale urban environment is useful for a variety of computer graphics applications. For example, it lets urban planning applications simulate changes to city layouts or newly proposed neighborhoods, create hypothetical views of an urban area after applying development and growth algorithms, and show architects the results of using common building blocks to design a new city layout.     

Post-Failure Reconfiguration of CSP Programs

In this paper a technique called process merging is introduced. This technique allows the merging of two communicating sequential processes into a new single process. Thus, this technique can be used to reconfigure a distributed program after a faulty processing element has been detected. The technique is most applicable to dedicated multiple microprocessor systems where the need for continuous operation is critical. A process merging algorithm which operates on distributed programs using the CSP notation is presented in detail and its operation is discussed. In order to illustrate the merging technique, the algorithm's behavior is demonstrated using two classical distributed programs: the Bounded Buffer, Producer, Consumer program and the Dining Philosophers program. Finally, the merging technique is examined with respect to its demands on overall system operation and overhead. This examinatiQn leads to suggestions for future research.     

基于组件的反射中间件的重配置机制研究

中间件平台必须适应各种应用和嵌入式系统的日益增长的不同需求，为此，中间件平台需要具有静态配置和运行时的动态配置的能力。给出了一个面向对象的架构，使用反射的组件模型来管理配置和重配置。     

基于本体影射规则的软件集成重构研究

软件重构与系统互操作是计算机科学的普遍问题,从结构化设计、面向对象方法、代理技术以及标准化与开放系统,都把软件重用或重构作为基本目标,但实现异构系统协同还需要解决语义互操作问题,大量异构的遗留软件系统（legacy系统）在语义层上的冲突阻碍着它们间的重构与互操作,该言语分析了软件代理与基本体间的关系,给出了legacy软件重构框架;引入转换规则,采用精确或近似两种方法灵活地处理多本体间的语义转换,提出了基于本体转换的异构系统语义互操作算法。     

Fault Tolerance Using Dynamic Reconfiguration on the POEtic Tissue

Fault tolerance is a crucial operational aspect of biological systems and the self-repair capabilities of complex organisms far exceeds that of even the most advanced electronic devices. While many of the processes used by nature to achieve fault tolerance cannot easily be applied to silicon-based systems, in this paper we show that mechanisms loosely inspired by the operation of multicellular organisms can be transported to electronic systems to provide self-repair capabilities. Features such as dynamic routing, reconfiguration, and on-chip reprogramming can be invaluable for the realization of adaptive hardware systems and for the design of highly complex systems based on the kind of unreliable components that are likely to be introduced in the not-too-distant future. In this paper, we describe the implementation of fault tolerant features that address error detection and recovery through dynamic routing, reconfiguration, and on-chip reprogramming in a novel application specific integrated circuit. We take inspiration from three biological models: phylogenesis, ontogenesis, and epigenesis (hence the POE in POEtic). As in nature, our approach is based on a set of separate and complementary techniques that exploit the novel mechanisms provided by our device in the particular context of fault tolerance.     

自适应性重新配置模块的研究模型

从计算机网络面对的安全问题谈起,介绍了容侵系统的目标策略及可伸缩性容侵框架(SITAR)体系结构,并基于SITAR体系结构给出了自适应性重新配置模块的研究模型。     

Reconfiguration Analysis Using Generic Component Models

This paper presents a formal approach to analyze system reconfigurability, based on a generic component model, which describes the system from the services provided by its components, and their organization into operating modes, in order to achieve specific objectives. Following a bottom-up approach, services provided by elementary components are used as resources for services at a higher level. Several versions exist when the same service can be rendered by using distinct sets of resources. Reconfiguration results from the existence of multiple versions since a faulty resource does not imply losing the services that use it. A level regulation example shows the effectiveness of the proposed model and tools.     

An Optimization Approach to Control Reconfiguration

An optimization algorithm for the problem of control reconfiguration in response to operating condition changes or abrupt system component failures is presented here. The algorithm utilizes a version of the Broyden-Fletcher-Goldfarb-Shanno (BFGS) optimization method of conjugate directions. The algorithm provides an output feedback controller that not only stabilizes the new /impaired system, when possible, but also preserves much of the dynamics of the original /unfailed system. The design is such that the closed-loop system is robust with respect to inevitable uncertainties /modelling errors on the state-space matrices of the impaired system. The algorithm is applied to an aircraft longitudinal control system, for which two severe cases of failure are considered, first the loss of an actuator and then the loss of a sensor in addition to the actuator loss.     

Ad Hoc网络路由重构技术研究

由于Ad Hoc网络的特点,从它出现就一直受到了各界的广泛关注,尤其是在军事领域中,得到了广泛的研究与应用。在一些特殊的军事应用中,节点的移动方向以及移动速度都与作战需求有很大的关系,这导致网络拓扑结构实时变化。而在战术Ad Hoc网络这样一个动态变化的网络中,怎么样提供更好的路由服务、确保信息及时准确的送达是一个迫切需要解决的问题。针对这个问题论文主要介绍Ad Hoc网络路由重构技术的特点和主要因素,并在原有路由重构算法的基础上提出一种基于路径跳数和带宽的最短路径路由选择算法,通过实验验证,该算法能在网络拓扑结构发生变化触发路由重构时,有效选择一条到达目的节点的新链路,从而保证战术Ad Hoc网络环境下,指挥作战信息的畅通传输。