共查询到20条相似文献,搜索用时 15 毫秒
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简要介绍主流的大数据技术架构和大数据挖掘技术;阐述大数据技术在精准营销与维系系统建设中的应用,包括技术实现方式以及大数据能力的体现,最后展望大数据应用的前景。 相似文献
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时间戳顺序在分布式并发控制中的应用 总被引:2,自引:0,他引:2
分布式系统以其优越的性能正在逐步取代传统的客户/服务器结构,时间戳顺序由于其控制精确,不会中断处理事务的优点而在分布式事务管理系统中占有重要的地位.介绍了分布式并发控制的主要技术--时间戳顺序技术及其应用. 相似文献
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本文利用JNI技术使JAVA与C/C++的动态链接库dll进行通信和调用,用JAVA语言实现了Ping操作。该模块最终可以应用到JAVA语言实现的网管系统中。 相似文献
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本文通过在工艺实践中的经验及革新的思路,介绍了高精度制版的工艺方法。实现了利用现有设备进行毫米波基片制版,取得了较好的效益。 相似文献
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Ping的原理及实现 总被引:1,自引:0,他引:1
Ping命令是在互连网络中进行故障检测的工具,通俗地说就是它向指定的机器发送一个消息,然后通知是否成功地传送了该消息。简要的介绍了ICMP协议,ICMP报文格式和IP报文格式,阐述了Ping的原理及其实现。 相似文献
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There exist accurate calculation methods for estimation of interference power sum statistics in fixed-topology wireless networks
based on the log-normal shadowing radio model. Here we publish essential additions to these estimation methods to expand their
use to sensor networks and ad-hoc networks with changing topology. In our calculations we take into account radio propagation
conditions, density of nodes, size of the network, traffic load per node and MAC protocol characteristics. The accuracy of
our calculation method is verified by simulations. We highlight the influence of MAC protocols on interference and show that
an increase in network size or in node density does not necessarily lead into higher interference values. Our results can
be deployed to estimate the network capacity.
Ramin Hekmat received M.Sc. degree in electrical engineering from Delft University of Technology (TU Delft) in the Netherlands in 1990.
He worked since then for several telecommunication companies in the Netherlands and the United States in Research and Development
as well as managerial positions. In September 2005 he obtained Ph.D. degree for his work related to Ad-hoc Networks form TU
Delft. Currently he is working as assistant professor in the faculty of Electrical Engineering, Mathematics and Computer Science
of TU Delft. His prime research interest includes multi-user communication systems, wireless communications and peer-to-peer
networks. Email: r.hekmat@ewi.tudelft.nl Mailing address: Delft University of Technology Electrical Engineering, Mathematics
and Computer Science P.O. Box 5031 2600 GA Delft The Netherlands.
Piet Van Mieghem has obtained the Master and Ph. D. in Electrical Engineering from the K.U.Leuven (Belgium) in 1987 and 1991, respectively.
He has joined the Interuniversity Micro Electronic Center (IMEC) from 1987-1991. He was a visiting scientist at MIT, department
of electrical engineering from 1992-1993. From 1993 to 1998, he was working in Alcatel Corporate Research Center in Antwerp
where he has gained experience in performance analysis of ATM systems and network architectural concepts of both ATM networks
(PNNI) and the Internet. Currently, he is full professor at Delft University of Technology with a chair in telecommunication
networks. The main theme of the research is evolution of the Internet architecture towards a broadband and QoS-aware network.
Email: p.vanmieghem@ewi.tudelft.nl Mailing address: Delft University of Technology Electrical Engineering, Mathematics and
Computer Science P.O. Box 5031 2600 GA Delft The Netherlands. 相似文献
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本文介绍了本地网管系统的网络概况,对故障判断方法进行了分析,详细阐述了基于Delphi的本地网管网元监测系统的设计原理和主要功能模块的实现方式。 相似文献
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EPON系统中基于VLAN的组播设计 总被引:2,自引:0,他引:2
设计了EPON系统中基于VLAN的组播实现方案。该方案在OLT和ONU上使它们同时具有监听和代理的功能,减少了组播控制报文的带宽开销;并且改进了ONU设备的功能与结构,通过逻辑链路标识承载着与IP组播地址相对应的组播VLANID,使系统传输过程中在RS子层就能准确过滤转发数据。 相似文献
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Li Ning Guo Yan Guo Li 《电子科学学刊(英文版)》2007,24(5):710-716
In this letter,capacity estimation for Mobile Ad hoc NETworks (MANETs) using direc- tional antennas are studied.Two Matrix-based Fast Calculation Algorithms (MFCAs) are proposed to estimate the network capacity in a network scenario in which there is no channel sharing among multiple sessions and traffic is sensitive to delay with an end-to-end delay constraint.The first algo- rithm MFCA-1 is used to estimate network capacity in a situation where all links have the same delay. It estimates the maximum number of k-hop sessions in a network based on the k-hop adjacency matrix of the network.The second algorithm MFCA-2 is used to estimate network capacity in a situation where different links may have different delays.It calculates the maximum number of sessions in a network with an end-to-end delay constraint based on the adjacency matrix and the link-delay matrix of the network.Numerical and simulation results show that both MFCA-1 and MFCA-2 can calculate network capacity much faster than the well-known Brute-Force Search Algorithm (BFSA) but with the same accuracy. 相似文献
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宰家斌 《微电子学与计算机》2008,25(2):100-103
分析了基于ICMP协议的 Traceroute传统发现方法的低效,详细描述了双向树拓扑发现方法.结合启发式发现方法,提出了一种改进的拓扑发现方法.实验数据表明,该方法能够快速、准确地获得网络拓扑结构,更有效的降低网络负载. 相似文献
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对于样板生产以及中小批量的印制线路板时,常常会有一个困惑业界的难题:预投料的量通常由人依靠其工作经验进行控制,如果过多投料,会造成最终产出大于客户的需求量,从而导致过度浪费;如果过少投料,会造成最终产出小于客户的需求量,从而导致交期甩期以及客户抱怨。如果精确地实现预投料,使得产品最终产出最大程度地等于客户需求量,从而实现企业效益的最大化。文章的研究内容是利用一种基于统计学原理的数学模型来实现这个目标,这种模型不依赖人员的工作经验,可以实现计算机系统全自动运行,经过对产品的特征进行计算和分析,从而精确地确定出需要预投料的量。 相似文献
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针对BOC调制信号自相关函数多峰值造成的捕获模糊性问题,提出一种基于相关函数的去模糊性捕获算法。该算法能消除接收信号载频的影响;根据BOC伪码的相关函数计算原理构造与收信号相关的两路本地信号;根据相关结果的对称性,通过简单数学运算组成一个完全无模糊性的相关函数。理论分析和仿真结果表明,相比ASPeCT算法及重构相关算法,提出的捕获算法的主峰均值比例更高,副峰均值比例更低。在两径信道中,当时延小于一个码片时,该算法的主峰能量可达100%。利用TMS320C5509A芯片进行算法验证,进一步验证了该算法的有效性。 相似文献
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Yuping LAI;Yuan PING;Wenda HE;Baocheng WANG;Jingzhong WANG;Xiufeng ZHANG 《电子学报:英文版》2018,27(3):603-610
As a variant of Finite mixture model (FMM), finite Inverted Dirichlet mixture model (IDMM) can not avoid the conventional challenges, such as how to select the appropriate number of mixture components based on the observed data. Towards easing these issues, we propose a variational inference framework for learning IDMM which has been proved to be an efficient tool for modeling vectors with positive elements. Compared with the conventional Expectation maximization (EM) algorithm commonly used for learning FMM, the proposed approach prevents over-fitting well. Furthermore, it is able to do automatic determination of the number of mixture components and parameters estimation, simultaneously. Experimental results on both synthetic and real data of object detection confirm significant improvements on flexibility and efficiency being achieved. 相似文献