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Numerical resonances in method of moments

Numerical resonances in method of moments

引用

Antennas and Propagation Society International Symposium

作者： J. M. Song W. W. Shu W. C. Chew Department of Electrical and Computer Engineering Iowa State University Ames IA USA Center for Computational Electromagnetics & Electromagnetics Lab Department of Electrical and Computer Engineering University of Illinois Urbana IL USA

In this paper, we introduce the concepts of original resonance and model resonance, followed by numerical matrix resonance and right-hand-side (RHS) resonance. The errors in electric current and scattered field near t... 详细信息

ISBN: (纸本)9781424408771;1424408776

关键词： Moment methods Resonant frequency Electromagnetic scattering Integral equations message-oriented middleware Mie scattering Current Magnetic resonance Shape Eigenvalues and eigenfunctions

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Multiple hardware-acceleration platforms for the full-wave analysis of circuits

Multiple hardware-acceleration platforms for the full-wave a...

引用

Antennas and Propagation Society International Symposium

作者： John R. Humphrey Michael R. Bodnar Eric J. Kelmelis EM Photonics Inc. Newark DE USA

ISBN: (纸本)9781424408771;1424408776

Multiple hardware-acceleration platforms for the full-wave analysis of circuits was presented in this paper. The authors seek to alleviate the well-known computational bottleneck of the Arnoldi-based iterative kernels, such as conjugate gradients (CG) and generalized minimal residuals (GMRES), in an effort to provide tremendous performance gains compared to the respective software implementation. The matrix-vector product operation required at each iteration in the construction of the Krylov subspace, which is the main bottleneck, is the target operation for these acceleration platforms.

关键词： Circuit analysis Field programmable gate arrays Acceleration message-oriented middleware Integral equations Hardware Random access memory Photonics Circuit simulation Finite difference methods

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Analysis of Nonuniform Transmission Lines Using the Method of Moments

Analysis of Nonuniform Transmission Lines Using the Method o...

引用

Asia-Pacific Conference on Microwave

作者： Mohammad Khalaj-Amirhosseini College of Electrical Engineering Iran University of Science and Technology Tehran Iran

A method is proposed for analysis of arbitrarily loaded lossy and dispersive nonuniform transmission lines (NTLs). In this method, the integral equations of the NTLs, converted from their differential equations, are s... 详细信息

关键词： Distributed parameter circuits Moment methods Integral equations Differential equations Microwave theory and techniques Dispersion message-oriented middleware Frequency domain analysis Educational institutions Microwave technology

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Self-Healing in Distributed Network Environments

Self-Healing in Distributed Network Environments

引用

International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Andreas Rott C-LAB University of Paderborn Germany

As a new vision in designing computer systems, organic computing is becoming more and more important. These systems are very flexible, autonomous and geared to the organic, human model. They are designed for self-optimizing, self-configuring, self- healing and self-protecting behavior. In the networking area we currently notice a centralization trend resulted in centralized servers, from where an immense number of distributed clients in worldwide locations are being controlled. Because of this centralization process ever fewer administrators are responsible for ever more systems. Concurrently the complexity of software and the dependence on local and distributed systems are growing with each new software version. Therefore it makes sense to apply the organic computing approach to a system that supports this increased requirements, adopting the behavior of human system administrators with the special focus of self-healing.

关键词： Humans Computerized monitoring Computer networks Computer vision Condition monitoring Network servers Immune system Distributed computing Hardware message-oriented middleware

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FDTD Analysis and Experimental Research of Shielding Effectiveness of the Cage Built with Wire-Mesh Reinforcementm

FDTD Analysis and Experimental Research of Shielding Effecti...

引用

International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Chaoqun Jiao Xiang Cui Lin Li Zhibin Zhao School of Electrical Engineering Beijing Jiaotong University Beijing China School of Electrical Engineering North China Electric Power University Baoding China

A numerical method is presented for calculating shielding effectiveness of the cage built with wire-mesh reinforcement. The model is based on the field approximation for thin wire in the finite-difference time-domain (FDTD) method. Then, the proposed method is used to the analysis of shielding effectiveness (SE) of wire-mesh reinforcement. The FDTD results are in very good agreement with the results from the method of moment (MOM). And then a test is made to research shielding effectiveness of wire-mesh reinforcement. The test results are compared with the results from MOM.

关键词： Finite difference methods Time domain analysis Wire message-oriented middleware Electromagnetic compatibility Testing Microwave antennas Antennas and propagation Microwave propagation Communications technology

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Investigation of CFIE Multipoint Testing MOM Scheme for Triangulated Dielectric Objects at Low Frequencies

Investigation of CFIE Multipoint Testing MOM Scheme for Tria...

引用

International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

作者： F. G. Bogdanov R. G. Jobava EMCoS Limited Tbilisi Georgia

CFIE multipoint testing MoM scheme for triangulated dielectric objects is investigated for different sets of test points to obtain the most stable solution being suitable at low frequencies. The obtained near field ch... 详细信息

关键词： Testing message-oriented middleware Dielectrics Frequency Integral equations Impedance Moment methods Electromagnetic compatibility Geometry Stability

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An Adaptive Frequency Sampling Method for Frequency Selective Surface design Exploiting Steor-Bulirsch Algorithm

An Adaptive Frequency Sampling Method for Frequency Selectiv...

引用

Asia-Pacific Conference on Microwave

作者： J.Q. Chen Z.W. Liu R.S. Chen D.Z. Ding Z.H. Fan X.D. Ye K. Sha Department of Communication Engineering Nanjing University of Science and Technology of PLA Nanjing China

In this paper, the adaptive frequency sampling (AFS) method with Steor-Bulirsch (SB) algorithm is proposed in conjunction with the method of moments (MOM) to calculate the broadband electromagnetic scattering performance of the frequency selective surface (FSS). Comparing with other sampling methods, the Store-Bulirsch algorithm is a recursive tabular method and requires no matrix inversion, so it can obtain a rational interpolation function without suffering from singularity problems. Furthermore, since we use the AFS strategy to interpolate the final results, no more information is needed except the sampled frequency f and its true value, so it can be widely used in most of the electromagnetic (EM) simulation. Numerical results show that our sampling strategy has a good performance in both CPU time saving and computation accuracy.

关键词： Sampling methods Frequency selective surfaces Algorithm design and analysis Interpolation Moment methods message-oriented middleware Electromagnetic scattering Microwave theory and techniques Microwave communication Computational modeling

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A Modified Method to Determine the Position to Suspend ADSS Cable on High Voltage Transmission Tower

A Modified Method to Determine the Position to Suspend ADSS ...

引用

IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Zhibin Zhao Tiebing Lu Xiang Cui Lin Li North China Electric Power University Baoding China

In this paper, the method to locate ADSS on power tower is based on MOM. Firstly, possible positions for ADSS cable suspending are obtained based on the IEEE P-1222 standard and distribution of potential around the transmission line and tower. And subsequently, analysis of electric field along the ADSS cable is performed to choose the position where the electric field intensity is lowest as the final location. Considering both the influence of potential and that of the electric field, the discussed technique is effective for the purpose.

关键词： Voltage Poles and towers Power cables Conductors Maxwell equations Conductivity Electric potential Cable shielding message-oriented middleware Power transmission lines

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An Effective Fast Matching oriented Slot Antenna Designing Method with RFID Tag Chip

An Effective Fast Matching Oriented Slot Antenna Designing M...

引用

International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Yongming Zhou Zhilong Zhong Yuanquan Hong Department of Electronic Engineering Shaoguan University Shaoguan China

One of the important factors that determine the performance of RFID (radio frequency identification) system is whether the design of the RFID tag antenna is able to achieve an effective matching between the antenna and its chip. The paper studies how the changes of antenna's geometry parameters affect both real and imaginary part of impedance of slot antenna by using the MOM (Method of Moment) and then presents an effective method, which achieves quick and effective matching through changing the geometry parameters of the bent slot antenna. The paper further validates its method by designing a slot antenna for a set of chips at 915 MHz frequency band through simulation. The test results show that the matching between slot antenna and tag chip has high matching speed, high efficiency and excellent directivity. And the test also proves 'hat the antenna satisfies the RFID application requirements. All these results further validate the reliability of the presented matching method.

关键词： Slot antennas Design methodology RFID tags Radiofrequency identification Geometry Testing Impedance message-oriented middleware Moment methods Frequency

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Multiple-Objective Metric for Placing Multiple Base Stations in Wireless Sensor Networks

Multiple-Objective Metric for Placing Multiple Base Stations...

引用

International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Soo Kim Jeong-gil Ko Jongwon Yoon Heejo Lee Department of Computer Science and Engineering Korea University South Korea

The placement of base stations in wireless sensor networks affects the coverage of sensor nodes, the tolerance against faults or attacks, the energy consumption and the congestion from communication. However, previous studies mostly focus on the placement of base stations to improve a partial property, not considering all of them. In this paper we propose multiple-objective metric (MOM), which reflects four different metrics for base station placement in wireless sensor networks. First, the ratio of sensor nodes which can communicate with a base station via either single-hop or multi-hop represents the coverage of sensor nodes. Second, the average ratio of sensor nodes after the failure of base stations represents the fault tolerance of a network. Third, the average distance between sensor nodes and their nearest base station represents the energy consumption of a network. Fourth, the standard deviation of the degree of base stations represents the average delay of a network due to congestion. We show that placing multiple base stations using our proposed MOM can fairly increase various properties of wireless sensor networks

关键词： Base stations Wireless sensor networks message-oriented middleware Energy consumption Sensor phenomena and characterization Computer science Power engineering and energy Network topology Fault tolerance Directional antennas

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