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2003-2017 电子、通信与自动控制技术
为您找到包含“”的内容共12143

Lai Wenyan,Liao Qing

Under a deeply analysis on the resource features in the IOT, a conclusion is drawn that the architecture and information discovery service based ONS proposed by EPCGlobal do not apply to the IOT (Internet of Things). In recent years, many research results show that structured P2P technology has a prominent advantage on information discovery service. In this paper, we come up with a new model of resource discovery based on P2P, and described in detail in the following aspects: new identification of things, network architecture, and resource dynamic discovery algorithm based on the new architecture. We believe this model is helpful for the development of IOT, and finally simulation results show that the algorithm has high efficiency.

2012-11-16

School of information and communication engineering, Beijing University of Posts and Telecommunications, Beijing 100876,School of information and communication engineering, Beijing University of Posts and Telecommunications, Beijing, 100876

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

陈广,尹武良,郝建娜

2012-11-13

电磁检测技术是一种新型的无损检测技术,被广泛应用于导电物体的电学特性测量。本文通过理论分析和仿真验证,揭示了共轴线圈对互感信号的相位信息与被测溶液电导率/ 激励频率之间的正比关系。基于这种关系,作者提出了一种利用共轴线圈对测量电解质溶液电导率的非接触式测量方法, 并设计开发了一套基于FPGA架构的低电导率电解质溶液测量装置。实验结果表明,该方法具有实时性高、无接触的特点,在流体实时检测和长期监控方面有较好的研究价值和应用前景。

国家自然科学基金国际重大合作资助项目(60910001

天津大学电气与自动化工程学院,天津 300072,天津大学电气与自动化工程学院,天津,300072,天津大学电气与自动化工程学院,天津,300072

#电子、通信与自动控制技术#

0评论(0 分享(0)

HAO Jianna,ZHAO Qian,CHEN Guang,XU Kai,YIN Wuliang

For Electromagnetic Tomography (EMT) Techniques, image reconstruction is one of the crucial steps. For previous works, two criteria, namely the relative image error and correlation coefficient, were often used to evaluate reconstruction quality, but the measurement uncertainty, which exists in the process of obtaining inductance measurements and sensitivity maps, wasn't taken into account. In this paper, a statistical index was proposed for the first time to quantitatively evaluate the image confidence level for each pixel of the reconstructed image through error propagation analysis.

2012-11-16

Chinese NSF (No.60910001

School of Electrical Engineering and Automation, Tianjin University, TianJin 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

ZHAO Qian,HAO Jianna,CHEN Guang,XU Kai,YIN Wuliang

Magnetic induction tomography (MIT) is an imaging technique based on the measurement of the magnetic field perturbation due to eddy currents induced in conducting objects exposed to an external magnetic excitation field. In MIT, current-carrying coils are used to induce eddy currents in the object and the induced voltages are sensed with receiving coils. When the driving frequency is significantly high, metallic targets with high conductivity between the coils can be treated as perfect electric conductors (PEC) with negligible errors. Boundary Element Method (BEM) based on integral formulations becomes an effective way to analyze this kind of scattering problems since meshes are only required on the surface of the object. But how to deal with the singular integral is a difficult issue unlikely to avoid. The method of auxiliary source (MAS) introduces the concepts of auxiliary surface and auxiliary source which avoid the computation of singular integrals. In this paper, the formula of sensitivity distribution was obtained by MAS with high efficiency and accuracy and then simulations by MATLAB were programmed. According to the good agreement of these results obtained by different numerical methods, we can know that MAS is an effective way to analyze the sensitivity distributions of high frequency MIT system.

2012-11-16

Doctoral Tutor’s Fund (No.20090032110062

Chinese NSF (No.60910001

School of Electrical Engineering and Automation, Tianjin University, TianJin 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

ZHAO Qian,CHEN Guang,HAO Jianna,XU Kai,YIN Wuliang

Magnetic induction tomography (MIT) is an imaging technique based on the measurement of the magnetic field perturbation due to eddy currents induced in conducting objects exposed to an external magnetic excitation field. In MIT, current-carrying coils are used to induce eddy currents in the object and the induced voltages are sensed with receiving coils. When the driving frequency is significantly high, metallic targets with high conductivity between the coils can be treated as perfect electric conductors (PEC) with negligible errors. In this scenario, the penetration depth of the magnetic field into the target is extremely small and Finite Elements Method (FEM) is not efficient for the calculation of the sensitivity and the forward problem due to the requirement for large number of elements to reach an acceptable computational precision. However, Boundary Element Method (BEM) based on integral formulations becomes an effective way to analyze this kind of scattering problems since meshes are only required on the surface of the object. By point collocation, the boundary integral equations can be transformed into linear equations. Then numerical method is used to solve the linear equations and the solution of the original integral equations can be obtained. In this paper, we computed four typical sensitivity maps between the coil pairs in high frequency MIT system due to a PEC perturbation. The magnetic scalar potential was used to improve the efficiency. Five PEC objects of different shapes were used in the simulation. The results have been compared with the experimental results and that obtained from the H dot H formulations. We can know that the sensitivity maps derived by BEM are in good agreement with that from experiment and theoretical solution. Overall, BEM is an effective way to calculate the sensitivity distributions of high frequency MIT system.

2012-11-16

Doctoral Tutor’s Fund (No.20090032110062

Chinese NSF (No.60910001

School of Electrical Engineering and Automation, Tianjin University, TianJin 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072,School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

周正,李艳萍

2012-11-14

本文提出了Turbo码中一种长度可变的S-随机交织器。基于S-随机交织器,利用较短长度的S-交织器构造出一定长度的交织器,计算复杂度大大降低,性能却与S-随机交织器相当,且随着交织器长度的增加,误比特性能提高,同时,分块值较大的交织器对长度的删减有较强的鲁棒性。

太原理工大学信息工程学院,太原 030024,太原理工大学信息工程学院,太原 030024

#电子、通信与自动控制技术#

0评论(0 分享(0)

宋辉,陈建亚

2012-11-21

对现有的IP/MPLS路由算法进行介绍和比较,给出了一种采用基于遗传算法的改进LTE移动回传网路由算法,该算法改进了遗传算法的种群初始化过程,同时提出一种新的适应度计算函数。通过OPNET结合Matlab仿真表明:在相同的网络环境下,该算法相比较传统IP/MPLS采用的路由算法,更好地实现网络流量均衡和MME服务器负载均衡,同时提供了可靠的QoS保障。

北京邮电大学信息与通信工程学院,北京 100876,北京邮电大学信息与通信工程学院,北京 100876

#电子、通信与自动控制技术#

0评论(0 分享(0)

杨博,赵振纲

2012-11-22

随着汽车工业的快速发展,车辆间通信问题,即智能交通网络问题,越来越受到人们的关注。智能交通网络能实现路况监测、突发事故报警、智能交通调度、汽车娱乐等多种功能,具有十分广阔的应用前景。目前国外对于智能交通网络已经提出了802.11p协议,而国内对于这方面的研究还处于起步阶段。本文针对智能交通网络的拓扑结构进行研究,提出了符合车辆通信环境特征的可行的拓扑结构,并依据智能交通网络特有的属性,对无线网络的切换方案进行优化,提出了具体的基于位置信息的切换算法,提高了切换的准确率和成功率,并大大缩短了切换时延。

北京邮电大学信息与通信工程学院,北京 100876,北京邮电大学信息与通信工程学院,北京 100876

#电子、通信与自动控制技术#

0评论(0 分享(0)

WANG Xiaoting,WANG Yuliang

This paper proposes a novel proportional fair scheduling (NPFS) scheme in a relay based Orthogonal Frequency Division Multiple Access (OFDMA) downlink scenario. The NPFS scheme generalizes the basic idea of proportional fair scheduling (PFS) algorithm and considers not only the channel condition, but also the user throughput and packet delay before making the final decision. Compared with the traditional proportional fair (PF) scheme, the proposed algorithm can obtain larger system throughput and lower average packet delay with approximately the same user fairness. Simulation results verify that the NPFS scheme is able to make a better tradeoff between system throughput and user fairness than its counterparts.

2012-11-14

School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876,School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, 100876

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

ZHANG Minglan,Di Zhaoting,YANG Ruixia

Unintentionally doped GaN films grown by MOCVD were irradiated with neutron at room temperature. In order to investigate the influence of neutron irradiation, persistent photoconductivity (PPC) and low temperature photoluminescence (PL) measurements were carried out. Pronounced PPC is observed, and yellow luminescence (YL) band is not be detected by PL measurement at 5K, suggesting that PPC and YL are not related. Moreover, PPC phenomena has been enhanced by neutron irradiation and quenched by the followed annealing process at 900 C. The possible origin of PPC in GaN is discussed.

2012-11-21

河北省高等学校科学技术研究重点项目(项目编号:ZD2010124

高等学校博士学科点专项科研基金资助课题新教师类(项目编号:20111317120005

Colleage of Information Engineering, Hebei University of Technology, TianJin 300401,Colleage of Information Engineering, Hebei University of Technology, Tianjin 300401,Colleage of Information Engineering, Hebei University of Technology, Tianjin 300401

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)