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网络编码是近年来通信领域的一种新的技术.网络编码允许中间节点将接收到的信息进行编码并发送出去,提高了网络吞吐量、健壮性等.无线Mesh网可以使用网络编码技术显著提高多跳链路的传输性能.文中简要介绍网络编码的基本原理和线性网络编码,总结了网络编码在无线Mesh网中的最新研究进展,评述了网络编码对无线Mesh网通信性能的影响,包括提高网络吞吐量、健壮性和安全性,最后对其发展趋势进行了展望. 相似文献
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逆向工程技术作为先进制造领域里数字化共性技术平台的重要组成部分,是国家确立的"数字化和智能化设计制造"优先发展重点领域中需要首先解决的关键技术.在逆向工程的整个技术路线中,准确、高效地获得测量数据是根本.测得的数据必须经过有效的预处理,才能用于建模及后续技术应用.测量数据的预处理是保证后期模型重构质量的关键.逆向工程是由原有实物样件经过数模阶段到新的样件(首板)的技术过程.具体实施途径如图1所示. 相似文献
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逆向工程分析技术研究 总被引:6,自引:0,他引:6
近年来,许多组织面临着遗产系统的理解和演化问题,理解和演化遗产系统的问题在软件研究领域越来越重要。逆向工程通过提供一个对目标系统的设计和总体结构的较好的理解来辅助遗产系统的演化,是解决遗产系统问题的关键技术。文中介绍了逆向工程的定义,综述了逆向工程分析技术的研究进展,探讨了分析技术研究存在的不足之处,给出了未来的发展趋势。 相似文献
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王春艳 《数码设计:surface》2010,(8):191-193
逆向工程技术是工业设计的加速器,利用这项技术可以缩短新产品的开发周期,提高工作效率,降低产品的开发成本。文章从视觉心理学的角度分析了逆向工程给工业设计带来的"限制设计师思维"的问题,分析了逆向工程的滥用给中国工业设计带来的影响,提出了一种新的产品创新设计流程,即将逆向工程融合到产品开发的不同阶段,既能充分运用逆向工程为产品设计服务,又将逆向工程带来的负面影响降到最低。 相似文献
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近年来,许多组织面临着遗产系统的理解和演化问题,理解和演化遗产系统的问题在软件研究领域越来越重要.逆向工程通过提供一个对目标系统的设计和总体结构的较好的理解来辅助遗产系统的演化,是解决遗产系统问题的关键技术.文中介绍了逆向工程的定义,综述了逆向工程分析技术的研究进展,探讨了分析技术研究存在的不足之处,给出了未来的发展趋势. 相似文献
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Automatic protocol reverse engineering is a process of extracting protocol message formats and protocol state machine without access to the specification of target protocol. Protocol reverse engineering is useful for addressing many problems of network management and security, such as network management, honey-pot systems, intrusion detection, Botnet detection and prevention, and so on. Currently, protocol reverse engineering is mainly a manual and painstaking process which is time-consuming and error-prone. In this paper, we present a novel approach for automatic reverse engineering application-layer network protocols. We extract protocol keywords from network traces based on their support rates and variances of positions, reconstruct message formats, and infer protocol state machines. We implement our approach in a prototype system called AutoReEngine and evaluate it over four text-based protocols (HTTP, POP3, SMTP and FTP) and two binary protocols (DNS and NetBIOS). The results show that our AutoReEngine outperforms the existing algorithms. 相似文献
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应用网络编码的P2P内容分发 总被引:1,自引:0,他引:1
讨论如何在P2P内容分发系统中应用网络编码技术,结论是网络编码能简化P2P内容分发中的Piece Selection算法的复杂度,提高网络资源的利用率.但是,网络编码,必须结合较好的Neighbor Selection和Choking/Unchoking机制,否则,其优势将无从体现.同时,还详细描述在P2P内容分发中如何应用网络编码技术,并逐一讨论应用过程中所涉及到的主要问题.为了证明基于网络编码的P2P内容分发系统的可行性,在单机上实现主要的编、解码算法,分析其时系统资源的消耗.实验的结果是如果一个peer的上栽速率为50 KBps,则编码操作导致的CPU占用率为2.25%,相应的内存开销在20 MB左右.这些数据说明网络编码的系统开销是较轻的,基于网络编码的P2P内容分发系统是完全可行的. 相似文献
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《Computer》2004,37(2):21-25
Fred Brooks long ago observed that there is no silver bullet to improve software quality. However, there are copper bullets-lesser steps that improve quality over time. One of these is the notion of software engineering, the practice of thinking carefully before immersing yourself in the minutia of coding. We offer a summary of his experience indicating that database reverse engineering offers a quality improvement strategy, that could benefit the entire software community. 相似文献
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G. Draper-Gil J. Zhou J. L. Ferrer-Gomila M. F. Hinarejos 《International Journal of Information Security》2013,12(4):299-318
The study of business transactions is a topic of interest in the field of electronic commerce. Fair Exchange protocols deal with the problem of how the different parties involved in a transaction can exchange their parts securely, i.e., with assurance that the other parties will carry on with the transaction. Fair Exchange is a field of research that has been extensively studied, but we have found that previous proposals have failed to address one problem that concerns electronic commerce, i.e., transactions with active intermediaries. Previous Fair Exchange protocols deal with scenarios where only 2 parties are involved or scenarios where N known parties have to reach a common agreement, omitting scenarios where active intermediaries are involved. In this paper, we present an Optimistic Fair Exchange protocol for transactions with active intermediaries, which, to the best of our knowledge, is the first of its kind. 相似文献
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