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Combined MDA-SVD-MLFMA for analysis of the EM scattering from complex objects

Combined MDA-SVD-MLFMA for analysis of the EM scattering fro...

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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Z. N. Jiang S. Shang X. Q. Hu Y. Sun Z. H. Fan R. S. Chen Department of Communication Engineering Nanjing University of Science and Technology of PLA Nanjing China National Key Laboratory of Space Microwave Technology Xi''an Institute of Space Radio Technology Xi'an China

ISBN: (纸本)9781424457052

The multilevel fast multipole algorithm (MLFMA) is very efficient for solving the three-dimensional problems, but for the small size of the complex objects, the memory usage of the multilevel fast multipole algorithm is very large. To overcome this problem, the matrix decomposition algorithm - singular value decomposition (MDA-SVD) is used to alleviate the pressure of the “strong” interaction portion of the impedance matrix of the MLFMA. So a new hybrid method named combined MDA-SVD-MLFMA is proposed. It also overcomes the problem that the matrix filling time of the far field of MDA-SVD is a little long. The numerical results demonstrate the efficiency of this method.

关键词： Space technology Electromagnetic scattering Microwave technology message-oriented middleware Transmission line matrix methods MLFMA Matrix decomposition Impedance Filling Moment methods

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An EAI Pattern-Based Comparison of Spaces and Messaging

An EAI Pattern-Based Comparison of Spaces and Messaging

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International Conference on Enterprise Distributed Object Computing (EDOC)

作者： Daniel Martin Daniel Wutke Thorsten Scheibler Frank Leymann Institute of Architecture of Application Systems University of Stuttgart Stuttgart Germany

Enterprise application integration (EAI) is a major challenge for enterprises to ensure optimal utilization of their landscape of diverse applications . Enterprise application integration patterns help to ease this problem by describing recurring EAI problems and proposing possible solutions. As of today , message-oriented middleware (MOM) is state- of-the-art for EAI integration middleware infrastructures. However , space-based computing (SBC) has been found to offer essentially the same qualities as MOM in terms of asynchronous, reliable and loosely coupled communication and might therefore provide a suitable alternative to MOM in the field of EAI. The objective of this paper is to provide a comparison of MOM and SBC from an application's point of view through an in-depth analysis of EAI patterns, assuming SBC instead of MOM as their underlying middleware .

关键词： message-oriented middleware Space technology Pattern analysis Application software Computer architecture Java Distributed computing Software design message service

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Bandwidth properties of odd mode resonances in frequency selective surfaces

Bandwidth properties of odd mode resonances in frequency sel...

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Antennas and Propagation Society International Symposium

作者： A.S. Barlevy Y. Rahmat Samii Department of Electrical Engineering University of California Los Angeles CA USA

Previous findings show that frequency selective surfaces (FSS) can have resonances of arbitrarily narrow bandwidths. The reason why the bandwidth of certain resonances is necessarily very narrow is shown. We prove that if the current distribution at resonance is mostly odd, then the current magnitude must approach infinity when the angle of incidence approaches normal (0/spl deg/). Since infinite currents cannot physically exist, the resonant bandwidth must approach 0/spl deg/ in order to suppress the infinite currents.

关键词： Bandwidth Resonance Frequency selective surfaces Reflection Integral equations Current distribution H infinity control message-oriented middleware Periodic structures Moment methods

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On the evaluation of spatial domain MoM matrix entries containing closed form Green's functions

On the evaluation of spatial domain MoM matrix entries conta...

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Antennas and Propagation Society International Symposium

作者： N. Kinayman M.I. Aksun R. Mittra EE Engineering Department Bilkent University Ankara Turkey EE Engineering Department Pennsylvania State University PA USA

The method of moments (MoM) is widely-used for the solution of mixed potential integral equations (MPIE) arising in the analysis of planar stratified geometries. However, the application of this technique in the spatial domain poses some difficulties since the associated spatial-domain Green's functions for these geometries are improper oscillatory integrals, known as Sommerfeld integrals, that are very computationally-intensive to evaluate. It is possible to eliminate the time-consuming task of computing these integrals by using closed form versions of the spatial domain Green's functions and the time required to evaluate the reaction integrals in the MoM matrix can be reduced considerably. Furthermore, the reaction integrals resulting from the application of the MoM can also be evaluated analytically by using piecewise linear basis and testing functions (Alatan et al., 1996). Hence, an efficient EM simulation algorithm can be developed by using the closed form Green's functions in the MoM formulation that involves no numerical integration. However, despite the time-saving realized from the analytical evaluation of the reaction integrals with the closed-form Green's functions, the need for further reducing the matrix fill-time is not obviated for many problems. Thus the objective of this paper is to present a hybrid technique for the evaluation of the MoM reaction integrals in a numerically-efficient manner that further reduces the time needed for their computation. A microstrip patch antenna is used as an example.

关键词： message-oriented middleware Green's function methods Transmission line matrix methods Least squares approximation Testing Computational geometry Taylor series Moment methods Integral equations MMICs

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The condition number issue for EFIE-MoM: spectral and MR considerations

The condition number issue for EFIE-MoM: spectral and MR con...

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Antennas and Propagation Society International Symposium

作者： P. Pirinoli G. Vecchi Dipartimento di Electronica Politecnico di Turino Torino Italy

The possibility of sparsifying the (fully populated) MoM matrix, as well as the speed of convergence of iterative solvers bear on the condition number of the MoM matrix itself. We discuss how the spectral properties of the employed basis functions determine the condition number of the associated MoM matrix, and the possibility of reducing it through a very low-cost diagonal preconditioner. We analyze the multiresolution (MR) basis functions from this standpoint, considering a previously proposed scheme for printed antennas and circuits, and proposing all extension. In it, the structure is hyerarchically decomposed in simple sub-domains, in which MR functions are employed; at the coarsest level a novel, structure-fitting spectral set of basis function is generated. An example of application concludes the work.

关键词： message-oriented middleware Jacobian matrices Matrix decomposition Spatial resolution Circuits Condition monitoring Costs Kernel Stability Sampling methods

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Multiplication using the triangular basis representation over GF(2/sup m/)

Multiplication using the triangular basis representation ove...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： R. Furness S.T.J. Fenn M. Benaissa School of Engineering University of Huddersfield Huddersfield UK

Bit-serial and bit-parallel multiplication in the finite field GF(2/sup m/) are considered. A bit-serial multiplier is proposed which operates in a similar way to the Hasan-Bhargava multiplier (HBM) proposed in 1992 but only one basis transformation is required as compared to two with the HEM. This basis transformation does not add to the latency of the multiplier if a pipelined structure is used. A regular structure to carry out this transformation is presented, derived directly from the irreducible polynomial for the field and which comprises only a number of XOR gates. The theory of the bit-serial multiplier is then extended and a bit-parallel multiplier presented. The proposed bit-parallel multiplier again requires just one basis transformation, the structure of which is identical to the bit-serial case. Both multipliers support VLSI architectures due to their circuit regularities and have lower hardware requirements than HBMs and Massey-Omura multipliers (MOMs). These multipliers are therefore highly suited to use in Reed-Solomon (RS) error-correction codecs.

关键词： Polynomials Galois fields Hardware Arithmetic Circuits Error correction codes Delay Very large scale integration message-oriented middleware Reed-Solomon codes

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Nanotube Micro-Opto-Mechanical Systems (N-MOMS)

Nanotube Micro-Opto-Mechanical Systems (N-MOMS)

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： S. Lu N. Shao Y. Liu B. Panchapakesan Delaware MEMS and Nanotech Laboratory University of Delaware Newark DE USA

In this paper we report the first applications of single wall carbon nanotube based micro-optomechanical systems (MOMS). Thin films of nanotubes with line widths ranging less than 1.5 μm and thicknesses ranging from 40 to 700 nm were patterned into micro-mechanical systems using batch fabrication techniques. Arrays of nanotube based MOM actuators, MOM-micromirrors and MOM-micro-grippers were fabricated using CMOS compatible techniques. Nanotube based MOMS devices showed better performance compared to their MEMS based electrostatic silicon counterparts and consumed only 200 μW-170 mW of power. These studies open a new field of nanotube based MOMS that could potentially outperform silicon based MEMS devices.

关键词： message-oriented middleware Nanoscale devices Silicon Carbon nanotubes Transistors Fabrication Actuators CMOS technology Micromechanical devices Electrostatics

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Adaptive scheme of calculation of 3D-wire structures by the method of moments

Adaptive scheme of calculation of 3D-wire structures by the ...

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

作者： R. Jobava S. Frei A. Radchenko Tbilisi State University Tbilisi Georgia EMC Center AUDI AG Ingolstadt Germany

The purpose of this work is the creation of a method, which would automatically detect the most suitable discretization of wire structures. The method is based on using information about currents and charges distribution to detect critical regions of an antenna. Such an adaptive scheme significantly accelerate the process of simulation of modern wire antennas.

关键词： Moment methods Wire message-oriented middleware Electromagnetic compatibility Adaptive arrays Computational modeling Cables Frequency Geometry Acceleration

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Estimating the parameters of the K-distribution using the ML/MOM approach

Estimating the parameters of the K-distribution using the ML...

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IEEE Region 10 International Conference TENCON

作者： D.R. Iskander A.M. Zoubir Signal Processing Research Centre Queensland University of Technology Brisbane Australia

The K-distribution has been successfully applied in many radar systems as a model for the radar clutter envelope. We consider the problem of estimating the scale and shape parameters of the K-distribution using a new approach that combines the maximum likelihood method with the method of moments. Simulation results show that the proposed method is superior to existing higher and fractional order moment based techniques. Additionally, unlike the maximum likelihood method, the new technique does not involve intensive numerical procedures making it applicable in practical systems.

关键词： Parameter estimation Maximum likelihood estimation message-oriented middleware Shape Moment methods Biomedical signal processing Radar signal processing Australia Radar clutter Humans

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Design of flexible structured fuzzy controllers using genetic algorithms

Design of flexible structured fuzzy controllers using geneti...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： D. Popovic Ning Xiong University of Brethemen Bremen Germany

Previously, optimal fuzzy logic controllers have been used successfully in a complex search space using various search approaches. The paper develops a genetic-algorithm based learning approach to implementation of a flexible structured fuzzy controller. The algorithm used facilitates simultaneous determination of control rules, of membership functions and of the structure parameters of the controller, that results in a high-performance controller, that is demonstrated on simulation examples.

关键词： Algorithm design and analysis Fuzzy control Genetic algorithms Fuzzy sets Flexible structures Arithmetic message-oriented middleware Optimal control Aggregates Fuzzy logic

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