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检索条件"主题词=message-oriented middleware"

共 1385 条记录，以下是251-260 订阅

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Optimal Design of Resonant Filters Employing Genetic Algorithm Combined with Moment Method

Optimal Design of Resonant Filters Employing Genetic Algorit...

引用

IEEE Conference on Electromagnetic Field Computation

作者： Y. Mitsutake M. Nakata K. Hirata Advanced Technologies Development Laboratory Matsushita Electric Works Limited Kadoma Osaka Japan Department of Adaptive Machine Systems Graduate Osaka University Suita Osaka Japan

This paper presents the optimization method employing the genetic algorithm (GA) combined with the moment method (MOM). This method is applied to a resonant band pass filter (BPF). The validity of the proposed method ... 详细信息

关键词： Algorithm design and analysis Resonance Genetic algorithms Moment methods Band pass filters Optimization methods message-oriented middleware Frequency Genetic mutations Passband

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Integration of multi-resolution functions into a two-level MoM code for the analysis of quasi-planar structures

Integration of multi-resolution functions into a two-level M...

引用

Antennas and Propagation Society International Symposium

作者： V. Volski F. Vipiana P. Pirinoli G. Vandenbosch G. Vecchi Department of Electrical Engineering Katholieke Universiteit Leuven Belgium Department of Electronics Politecnico di Turino Torino Italy

ISBN: (纸本)1424401224

This communication proposes the integration of the MAGMAS code with the multi-resolution (MR) approach described in F. Vipiana et al. (2005); the latter can be viewed, inter alia, as a powerful pre-conditioner. The MR scheme essentially consists in the generation and use of vector basis functions, applicable to the analysis of planar and/or 3D antennas, having properties similar to those of scalar wavelet. In particular the MR functions are spectrally localized and this allows the control of the condition number of the MoM matrix in the MR basis simply by application of a diagonal preconditioner. The MR approach leads to the construction of a basis transformation matrix, very sparse and frequency independent, whose rows express the MR functions as a linear combination of the RWG functions defined on the same mesh. For this reason the MR scheme could be quite easily integrated with other MoM-based codes that used the same sub-domain (RWG in the specific case of a triangular mesh) functions to represent the unknown current. The considerations offered in this contribution about the integration of the MR basis into an existing code make obvious reference to the MAGMAS code, but their validity extends to virtually all MoM codes

关键词： message-oriented middleware Transmission line matrix methods Circuits Sparse matrices Apertures Probes Multiresolution analysis Code standards Computational complexity Packaging

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A domain decomposition scheme to solve integral equations using equivalent surfaces

A domain decomposition scheme to solve integral equations us...

引用

Antennas and Propagation Society International Symposium

作者： Mao-Kun Li Weng Cho Chew Lijun Jiang Department of ECE U. Illinois CCEML Urbana-Champaign IL USA IBM Yorktown Heights NY USA

In this paper, a domain decomposition scheme based on the equivalence theorem and the method of moments (MOM) is introduced. The unknowns on every subscatterer are transferred to the unknowns on its surrounding equiva... 详细信息

ISBN: (纸本)1424401224

关键词： Integral equations Scattering message-oriented middleware Erbium Current Acceleration Computer interfaces Concurrent computing Parallel processing Finite element methods

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A combined technique ABT-MOM for on board analysis of TT&C antennas

A combined technique ABT-MOM for on board analysis of TT&C a...

引用

Antennas and Propagation Society International Symposium

作者： E. Di Giampaolo P. Tognolatti DISP Universita' di Roma Tor Vergata Rome Italy DIEL Universita' delľAquila LAquila Italy

A combined method-of-moment-astigmatic-beam-tracing (MOM-ABT) scheme is proposed for the electromagnetic field analysis of an on-board antenna. The method resorts to a vector spherical wave expansion to link the MOM code to the ABT code. This approach exploits the ability of full wave computation to treat detailed models of the antenna and its nearby structures while ABT is able to perform the analysis of the satellite environment. As an example of the proposed approach, the analysis of the interactions of Galileo satellite TT&C antenna with spacecraft is carried out

关键词： Satellite antennas Electromagnetic analysis Performance analysis Antennas and propagation Telecommunication computing Ray tracing Moment methods Electromagnetic fields message-oriented middleware Space vehicles

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Direct MR Preconditioner for MoM based fast methods

Direct MR Preconditioner for MoM based fast methods

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Antennas and Propagation Society International Symposium

作者： P. Pirinoli A. Freni P. De Vita F. Vipiana G. Vecchi Department of Electronics Politecnico di Turino Torino Italy Department of Electrical and Telecommunication University of Florence Florence Italy

ISBN: (纸本)1424401224

Matrices arising from field problems generally have very wide eigenvalue spectra, and therefore the use of a suitable preconditioner becomes necessary to reduce the total solution time, especially when the mesh is dense, as typical in antenna and circuit problems. In this paper, the preconditioning issue is addressed by having recourse to the multiresolution (MR) scheme that manages to generate "wavelet-like" hierarchical multiscale vector functions for any meshed geometry and well controls the method-of-moments (MoM) condition number, by the simple application of a diagonal preconditioner. The MR functions are expressed in terms of sub-domain functions, therefore their generation leads to the construction of a changing basis matrix T that is very sparse, and therefore it has a low memory occupation and its multiplication for any matrix in the RWG basis is low cost. For this reason, the computational cost required for the construction and the application of the MR preconditioner is very low and smaller than the one needed for the application of other preconditioners

关键词： message-oriented middleware Sparse matrices Symmetric matrices Linear systems Eigenvalues and eigenfunctions Large-scale systems Telecommunication computing Filling Costs Iterative methods

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Solution of large complex problems in computational electromagnetics using higher order basis in MOM with an out-of-core solver

Solution of large complex problems in computational electrom...

引用

Antennas and Propagation Society International Symposium

作者： Mengtao Yuan M.C. Taylor T.K. Sarkar B. Kolundzija Syracuse University Syracuse NY USA WIPL-D Limited Belgrade Serbia

ISBN: (纸本)1424401232

Limitations of current numerical techniques have been outlined. The objective of this article is to point out that these statements of limitations may be applicable for the methodologies like FEM, FDTD and the hybrid MOM technique that the author has considered. Indeed, for such techniques even an analysis of a single Vivaldi element is a formidable problem. However, if one uses a higher order basis in a surface integral equation and solves this using the conventional method of moments with the commercially available code WIPL-D then it becomes clear that even the 2times2 Vivaldi array consisting of 12 elements actually can be solved on a laptop DELL INSPIRON 5150 computer using approximately 2 GB of RAM. With other techniques, such a small computing resource may only be able to model a single element. For complex composite metallic and dielectric structures, the PMCHWT formulation using a higher order basis is an efficient way to solve challenging computational electromagnetic problems

关键词： Computational electromagnetics message-oriented middleware Read-write memory Random access memory Equations Hard disks Impedance Costs Finite difference methods Time domain analysis

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Finite Difference Time Domain Analysis of Shielding Effectiveness of Wire-Mesh Reinforcement

Finite Difference Time Domain Analysis of Shielding Effectiv...

引用

IEEE Conference on Electromagnetic Field Computation

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

A numerical method is presented for calculating shielding effectiveness of the 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 of wire-mesh reinforcement. The FDTD results are in very good agreement with the results of the method of moment (MOM) and experimental results

关键词： Finite difference methods Time domain analysis Wire message-oriented middleware Testing Equations Moment methods Electromagnetic compatibility Electromagnetic fields Electromagnetic modeling

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On the monotonicity of Mamdani-Assilian models with two input variables

On the monotonicity of Mamdani-Assilian models with two inpu...

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Ester van Broekhoven Bernard de Baets Department of Applied Mathematics Biometrics and Process Control Ghent University Ghent Belgium

In the Mamdani-Assilian models considered in this study, the linguistic values of the two input variables and the output variable are described by trapezial membership functions forming a fuzzy partition, the rule base is monotone and the t-norm T M , T P or T L is applied, combined with either the mean of maxima (MOM) or center of gravity (COG) defuzzification method. For these models, monotonicity cannot be guaranteed for all non-smooth rule bases. If the rule base is smooth, a monotone input-output behaviour is obtained when applying the t-norm T P combined with the MOM or COG defuzzification method. When applying the t-norm T M combined with the MOM defuzzification method to a model with a smooth rule base, the lengths of the intervals of non-constant membership degree should be equal for all membership functions used in the consequents of the rules, in order to obtain a monotone input-output behaviour

关键词： Input variables message-oriented middleware Mathematical model Gravity Kernel Mathematics Biometrics Process control Fuzzy control Fuzzy systems

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Review of helices for DTV broadcast from HAPS prototype

Review of helices for DTV broadcast from HAPS prototype

引用

Asia-Pacific Conference on Microwave

作者： D. Gray M. Nagatsuka R. Miura NICT Yokosuka Kanagawa Japan

A number of telecommunications experiments were flown on an autonomous, 68 metre non-rigid airship in November 2004. Although the digital television broadcast experiment was successful, it was found that the signal was occasionally entirely lost when the airship passed directly over one receiving station. The performance of the transmit helicial antenna is examined on a simple model of the airship gondola using a commercially available MOM software in attempt to identify features of the antenna that may have adversely affected the radiation pattern during the broadcast experiments. Two other types of helical antenna were also studied, and were found to potentially offer advantages in maintaining radiation pattern shape when installed on the gondola.

关键词： Digital TV Prototypes Antenna radiation patterns Helical antennas TV broadcasting Transmitting antennas message-oriented middleware Shape Asia Software performance

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Information Integration for Situation Awareness

Information Integration for Situation Awareness

引用

International Symposium on Collaborative Technologies and Systems

作者： J. Manternach T. Broadstock USAF Air Force Research Laboratory OH USA Science Applications International Corporation Dayton OH USA

The Air Force Research Laboratory continues to investigate technologies for improved situational awareness (SA) by developing a testbed for evaluating SA concepts and capabilities. Information Integration for Situational Awareness (IISA) is a collaborative framework that allows distributed, disparate users and resources to create and share a common understanding of the battlespace. The foundation of this framework is a message-oriented middleware that serves as an information repository and provides publish and subscribe services to push information to clients that require it. IISA clients plug into the framework via interfaces defined by Extensible Markup Language (XML) Schema, thus providing loose coupling and ease of integration. IISA envisions a wide variety of clients, both automated and user-based, to collect, refine, and distribute battlespace information. Clients connect realworld systems to IISA, including elements of command and control (C2) and intelligence, surveillance, and reconnaissance (ISR). IISA leverages modeling and simulation technologies to stimulate the testbed with synthetic battlefield information in the absence of realworld systems. The first phase of IISA development has been demonstrated in the context of an operations other than war (OOTW) scenario involving counter-insurgency operations in an urban setting. Key features of this phase of development include a flexible map viewer client and a simulation gateway. This baseline serves as a point of departure for continuing research in areas such as machine-to-machine process automation, adversarial modeling and prediction, and information distribution from unattended ground sensors (UGS). The ongoing development of IISA promises valuable lessons to support key initiatives such as predictive battlespace awareness and effects-based operations.

关键词： XML Command and control systems Laboratories Testing Collaboration message-oriented middleware Plugs Intelligent control Surveillance Reconnaissance

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