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旨在研究新型三维片上网络正四面体裂变拓扑结构,给出了该拓扑结构的生成过程;对该拓扑结构进行了编码设计和路由设计。通过对gpNoCsim片上网络仿真器进行三维扩展,对正四面体裂变拓扑结构进行性能仿真实验。仿真结果表明,在均匀负载模式下,正四面体裂变拓扑结构的平均延时和平均跳数均低于Mesh结构,当注入率为0.02时,平均延时比Mesh结构低16.8%、平均跳数比Mesh结构少5.5%;在局部负载模式下,当注入率大于0.008时,正四面体裂变拓扑结构的平均延时和平均跳数与Mesh结构相比,均有明显改善;当注入率为0.014时,平均延时比 Mesh结构降低18.7%、平均跳数比 Mesh结构减少9.6%。说明正四面体裂变拓扑结构可用于三维片上网络拓扑结构设计。 相似文献
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Chord算法是结构化P2P网络的经典算法。Chord具有很多优秀特性,但仍存在一定局限:节点异构性、负载均衡、热点资源问题与底层物理拓扑。从路由效率、负载均衡、拓扑匹配几个角度改进Chord,并在此基础上提出基于资源性能和热度的Hot-Chord。充分考虑节点异构性和底层物理拓扑结构,引入局部负载均衡,建立热环,提高热点资源搜索效率,从而提高性能。 相似文献
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三维片上网络是解决片上网络通讯瓶颈的重要途径,拓扑结构是三维片上网络研究中的关键问题之一。针对高维超立方拓扑结构节点度迅速增加,出现通讯瓶颈的问题,提出一种高维超立方裂变拓扑结构,该拓扑在同等网络规模下具有网络直径短、可扩展性强等优点。以五维超立方裂变拓扑结构为例进行了仿真实验,并与3D Mesh拓扑结构进行了对比分析:当两种拓扑结构在均匀负载状态下达到饱和时,五维超立方裂变拓扑结构的吞吐量比3D Mesh拓扑结构高300%,平均延时比3D Mesh拓扑结构低85.1%,平均跳数比3D Mesh拓扑结构少21.5%;在局部负载下,五维超立方裂变拓扑结构的平均延时比3D Mesh拓扑结构低79.1%,平均跳数比3D Mesh拓扑结构少13.3%。仿真实验表明提出的网络拓扑结构既保留了原有超立方体拓扑结构的优点,又解决了高维超立方体拓扑结构的通讯瓶颈问题。 相似文献
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为了提高片上网络在Torus拓扑结构下的路由通信效率,提出了一种基于直线引导思想的路由算法Tline。该路由算法将Torus拓扑结构的片上网络拓展为类似Mesh结构的坐标平面,以数据包的源节点和目的节点构成的直线为路由转发方向,并根据周围邻近节点的拥塞状况选择传输路径方向实现部分自适应路由。实验结果表明,与XY、OE路由算法相比,在热点流量模式下Tline路由算法具有较好的路由性能,且平均能耗降低约8%。 相似文献
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Storus:一个二维片上网络拓扑结构 总被引:2,自引:1,他引:1
朱晓静 《小型微型计算机系统》2008,29(4):751-756
随着CMOS工艺集成度持续不断提高,单片多处理器正在成为高性能处理器结构的发展趋势,现有的片上总线结构已不足以满足片上系统设计的互连需求,近年来提出了片上网络这一新的互连结构,片上网络需要解决的问题有:选择合适的拓扑结构、路由算法、流控机制等等.文中为片上网络结构提供了一个新的拓扑结构Storus以及路由算法L2,并使用多种负载模式、多种流控机制对Storus与Torus结构进行模拟分析.模拟结果显示,Storus的平均路由延时约比Torus小2%~15%,使用热点负载模拟时,Storus的饱和吞吐量约为Torus结构的1.2~1.5倍. 相似文献
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针对片上网络的非均匀业务流,提出一种基于模拟退火遗传算法的缓冲区资源分配算法,对系统的有限缓冲区资源的分配问题进行了研究。该算法建立在二维Mesh结构的片上网络通信模型基础上,根据各节点间的业务流特征,估计出节点中各输入通道的负载大小,再根据其负载情况采用模拟退火遗传算法进行缓冲区资源的分配,从而使整个网络的平均延时性能最优。实验中设置了不同的热点位置和热度,结果表明,该算法可以更合理地分配缓冲区资源,有效降低数据包的传输延时。在单热点通信流量下,热度为100%和300%时,可分别降低传输延时32.58% ~ 65.29%和35.54% ~ 70.38%;在双热点通信流量下,可降低传输延时52.02% ~ 70.43%。同时,该算法具有良好的收敛性。 相似文献
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S. Shaw 《Journal of Computer Assisted Learning》1993,9(2):93-99
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained. 相似文献
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European Community policy and the market 总被引:1,自引:0,他引:1
C. Lloyd 《Journal of Computer Assisted Learning》1993,9(2):86-91
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven. 相似文献
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融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。 相似文献
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张涛 《计算机测量与控制》2015,23(1):86-89
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. 相似文献
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Wayne O’Brien Author Vitae 《Journal of Systems and Software》2008,81(11):1997-2013
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them. 相似文献
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This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives. 相似文献
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潘丽 《自动化与仪器仪表》2014,(7):80-82
自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。 相似文献
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Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what
is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic
sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and
its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of
an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify
robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can
or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest.
This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January
31–February 2, 2008 相似文献
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Jacob Palme 《Software》1979,9(9):741-747
The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users. 相似文献