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研究车辆网络中的路由问题,提出一种有效的路由协议。利用秘书问题的思想,该路由协议可以有效地选择对哪些车辆进行消息拷贝,因而提高发送成功率。基于真实车辆行驶数据的仿真实验表明,相比较其它方法,本文提出的路由协议可以实现更高的发送成功率。 相似文献
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为提高间歇性连接移动网络的消息发送效率,提出一种基于移动自组网OLSR协议的自适应路由协议ARPBO。ARPBO在网络连通时通过OLSR协议快速转发消息;在网络中断时对OLSR协议进行扩展,从消息发送节点的局部连通网络中有效选择下一跳节点,然后通过延迟容忍网络的"存储-携带-转发"机制转发消息。实验结果表明,该路由协议能够在网络存在间歇性连接时获得较高的传递成功率和较低的传递时延。 相似文献
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一种基于复杂网络理论的移动自组网路由算法研究* 总被引:1,自引:0,他引:1
针对移动自组网中节点之间数据包发送成功率不高、路由开销大和包平均延时长等问题,提出了一种基于复杂网络理论的移动自组网路由算法。在该算法中,路由发现基于路由消息在邻域范围的相互借阅,若持续时间在网络平均路由发现时间范围内,则采取动态随机路由,考核跳级数是否满足复杂网络理论的条件来选择以最少跳级数或者最短路径为指标的最优路径建立路由,否则采取位置路由,采取方向最有益的最优路径建立路由。实验分析表明,即使节点稀疏时该路由算法仍具有很好的包发送成功率和包平均延时,其综合性能优于OLSR协议和AODV协议。 相似文献
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基于稳定路径的MAODV协议改进 总被引:1,自引:0,他引:1
移动Ad Hoc网络组播路由协议MAODV中,组播树在节点移动速度较快的情况下会频繁重构,使得路由开销、传输时延显著增大。针对基于邻居节点变化率的稳定路径选择方法,提出一种新的节点邻居变化率的检测机制,不需要周期性地发送Hello消息,并在此基础上设计和仿真实现了基于稳定路径的MAODV协议SP-MAODV,新协议选择的路径稳定性好且跳数小。最后从数据分组传输成功率、路由开销、平均端到端时延和时延抖动四个方面对两个协议进行了仿真比较,结果表明SP-MAODV协议减少了路径中断概率,提高了协议性能。 相似文献
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针对现有的基于社会组的机会网络路由协议(SGBR)存在中继节点的选择和消息副本数量的分配不合理的问题,提出了基于社会组的高投递率机会网络路由协议(SGBRHDR)。SGBRHDR协议是一种采用分布式划分社会组的多副本路由协议。在社会组内,节点依据平均关系强度值决定相遇节点是否成为转发节点;在社会组间,节点依据相遇节点所在的社会组活跃性大小分配消息副本数量。采用ONE工具对SGBRHDR协议进行了仿真,仿真结果表明:与SGBR协议相比,SGBRHDR协议减小了消息平均端到端时延的同时,消息投递成功率提高了18%。 相似文献
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无人机自组网凭借其抗干扰能力强、适用于复杂地形、智能化程度高和成本较低的优点,近年来受到广泛关注,该网络中路由协议的设计与优化一直是核心研究问题。针对无人机自组网中因节点快速移动造成节点本地存储的路由未及时更新而失效的问题,提出一种基于Q-learning算法的动态感知优化链路状态路由协议(DSQ-OLSR)。该协议首先充分考虑了无人机自组网节点高速移动的特点,在选取多点中继(MPR)节点时添加了链路稳定性和链路存在时间这两个指标,使得选出的MPR节点集更稳定、合理;其次,结合Q-learning算法对TC消息的发送间隔进行自适应调整,使得在网络拓扑变动较小时增大TC发送间隔以减小控制开销,而在拓扑变动较大时减小TC发送间隔用于达到快速感知并构建网络拓扑的要求,进而实现数据的及时路由。仿真结果表明,与DT-OLSR协议相比,该协议在端到端时延、吞吐量、成功率和网络生存时间性能上分别提高了12.61%、9.28%、7.69%和5.86%,由此验证了其有效性。 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