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Radio Science Conference, 2000. 17th NRSC '2000. Seventeenth National

24-24 Feb. 2000

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Displaying Results 1 - 25 of 80
  • Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)

    Publication Year: 2000
    Request permission for commercial reuse | PDF file iconPDF (603 KB)
    Freely Available from IEEE
  • Author list

    Publication Year: 2000, Page(s):705 - 708
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    Freely Available from IEEE
  • Modular neural networks for face detection

    Publication Year: 2000, Page(s):C3/1 - C3/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A new concept for detection of human faces is presented. An efficient approach to reduce the computation time taken by neural networks for the searching process is introduced. We combine both Fourier and wavelet transforms with cooperative modular neural networks (MNNs) to enhance the performance of the detection process. Such an approach is applied to identify human faces automatically in clutter... View full abstract»

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  • Phasing and matching units for the CFA

    Publication Year: 2000, Page(s):B22/1 - B22/8
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Crossed field antenna (CFA) theory and applications are widely discussed. The electrical characteristics of the two inputs of the CFA are very important and have to be analyzed and studied carefully. This analysis is considered in detail. In addition, a phasing and matching unit which are inserted between the transmitter and the CFA antenna are designed and executed to fulfil the analysis of this ... View full abstract»

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  • Hybrid adaptive motion search with wavelet/wavelet packet based motion residual video coding

    Publication Year: 2000, Page(s):C2/1 - C211
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    We address the problem of efficiently encoding video sequences. A new system is proposed that overcomes the temporal redundancy by a new block based motion estimation called the hybrid adaptive motion search algorithm (HAMS), different wavelet/wavelet packet types are used for decomposition of the error frames, then the coefficients are thresholded and encoded. The new system achieves a reasonable... View full abstract»

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  • Solution of the non-uniformly spaced array problem using neural networks

    Publication Year: 2000, Page(s):B21/1 - B21/8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    A neural network algorithm used in a non-conventional way to solve the non-uniformly spaced array problem is demonstrated. Using this algorithm, the problem of uniformly spaced and non-uniformly excited arrays was solved. Comparison between this method and the Dolph-Chebyshev method demonstrated its capability of producing lower sidelobe levels for same beamwidth and number of elements. Moreover, ... View full abstract»

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  • Analysis of multimode planar graded index optical waveguides .2

    Publication Year: 2000, Page(s):B5/1 - B511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    An algorithm is developed for analyzing the propagation characteristics of multimode planar graded index optical waveguides. The algorithm is based on a modified impedance boundary method of moments, and is used to calculate the dispersion and the field distribution of multimode planar graded-index optical waveguides. The technique is based on Galerkin's procedure and the exact boundary conditions... View full abstract»

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  • Linear dipole with parallel-piped metallic reflector

    Publication Year: 2000, Page(s):B18/1 - B18/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A new antenna is proposed in this paper by constructing a simple antenna system, which consists of a λ/2 dipole antenna parallel to a parallel-piped metallic reflector. This combination led to a great modification in the antenna gain in the horizontal plane, which represents the main radiation plane. The method of moments is used in the analysis via a computer-aided code (NEC). Both the ele... View full abstract»

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  • Two partially adaptive antenna array techniques for interference elimination

    Publication Year: 2000, Page(s):B15/1 - B15/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Fully or partially adaptive antenna array (AAA) techniques are designed to reduce the effect of interference and jamming signals. This is done by automatically steering nulls in the array field pattern directed towards the direction of arrival of the interfering signal. We present two simple and easy-to-implement partially AAA techniques to eliminate the effect of interfering signal when its direc... View full abstract»

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  • Performance of FHMA, MFSK over Rician fading channel under MTJ

    Publication Year: 2000, Page(s):E1/1 - E111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    In this paper, the effect of multitone jamming (MTJ) on an FHMA/MFSK system is investigated. The channel under consideration is a Rician fading channel, with AWGN included in the analysis. The system capacity is considered as an indicator of the system performance and is calculated for different situations. The capacity is shown to be affected by channel fading state. For no fading, the capacity i... View full abstract»

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  • Scattering of an electromagnetic beam by a radially inhomogeneous sphere

    Publication Year: 2000, Page(s):B4/1 - B412
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    A method to calculate the scattering intensities of a multilayered sphere or a radially inhomogeneous sphere is presented. The sphere is illuminated with an electromagnetic wave of an arbitrary spatial distribution. The radially inhomogeneous sphere is modeled by a multilayered sphere. The method uses the technique presented by Wu and Wang (1991) and by Johnson (see Appl. Opt., vol.35, p.3285-96, ... View full abstract»

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  • Impact of the current global revolution in communication systems and networks on the social and economic lives in the Middle East

    Publication Year: 2000, Page(s):INV1/1 - INV1/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    We have demonstrated, in this paper, the potential of the knowledge-based society, opportunities, challenges and risks. It was noted, that there are many open issues, which need to be well evaluated in order to select the appropriate option for our region. Special emphasis, should be given to improve the infrastructure of the Internet backbone to be able to cope with the growing demand for high ca... View full abstract»

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  • Electromagnetic wave generation from elements of a cellular radiomobile system

    Publication Year: 2000, Page(s):K5/1 - K515
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (828 KB)

    Electromagnetic waves from the lower radio frequencies up through the optical spectrum can generate a myriad of effects and responses in biological materials at high radiation intensities, producing burns, cataracts chemical change, etc. Biological effects have been reported at lower radiation intensities, but it is not now known if low level effects are harmful. Most of the effects are not harmfu... View full abstract»

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  • Neural network face recognition using statistical feature extraction

    Publication Year: 2000, Page(s):C31/1 - C31/8
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    Recognition method of human face using statistical analysis feature extraction and a neural network algorithm is proposed. In the preprocessing step we detect the edges of the face image by using the Sobel algorithm. Then we propose a new method to transform the two-dimension black and white image to a one-dimension vector. Finally, based on the statistical analysis, we extract seven features. In ... View full abstract»

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  • Robust multipath resolving in fading conditions for mobile-positioning systems

    Publication Year: 2000, Page(s):C19/1 - C19/8
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Infrastructure-based mobile-positioning is receiving increasing attention in the field of wireless communications. This is is due to an order issued by the Federal Communications Commission (FCC) that mandates all wireless service providers to locate an emergency 911 caller within a high accuracy. Overlapping multipath propagation is one of the main sources of mobile-positioning errors, especially... View full abstract»

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  • Reference-free adaptive interference cancellation using cross-coupled scheme

    Publication Year: 2000, Page(s):C1/1 - C111
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    This paper deals with the reference-free adaptive interference cancelling techniques. A new cross-coupled adaptive interference canceller (CC-AIC), with only a single input is introduced. This scheme is capable for cancelling narrow-band interference (NBI) from a broadband signal or wideband noise from a narrow-band signal with a significantly better cancellation performance than the conventional ... View full abstract»

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  • Exact generalized polynomial array synthesis

    Publication Year: 2000, Page(s):B20/1 - B20/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    This paper is concerned with the symmetric excitation design of linear array antennas. Exact solutions for broadside array antenna synthesis are extended to cover evaluating the system of excitation coefficients producing general predetermined radiation patterns View full abstract»

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  • Using radial-basis function neural networks to shape the array factor and reduce the side-lobe levels of phased antenna arrays

    Publication Year: 2000, Page(s):B14/1 - B1410
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Shaping the array factor of an adaptive antenna array to obtain interference suppression is a difficult task due to the computational complexity, slow convergence rates and the high cost requirements. Although some antenna synthesis techniques can be used to reduce the side-lobe levels (and hence reduce the effect of interference arriving outside the main lobe), the resulting array factors suffer ... View full abstract»

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  • Simplifying and size reduction of Kaiser-Koch multiband fractal arrays using windowing and quantization techniques

    Publication Year: 2000, Page(s):B13/1 - B13/9
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Fractal arrays are known for their self-similar performance in multi-band operation. A large number of elements in the array is a source of inconvenience in the realization procedure. In this paper, a technique is introduced for the simplification and size reduction of the Koch array. The fractal array factors presented keep the same shape at several bands because they are constructed from self-si... View full abstract»

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  • A new proposed method for the design of broadband microwave planar diode detectors

    Publication Year: 2000, Page(s):D6/1 - D618
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    A new proposed CAD method for the design of broadband microwave planar square law diode detectors is presented. In this method, the proposed broadband (low-Q) short circuit passive networks are used to contribute in diode matching. This method produces diode detectors with low VSWR over the useful broad bandwidth without using diode biasing (self bias) and without using resistance in the diode mat... View full abstract»

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  • Chiral absorbing material

    Publication Year: 2000, Page(s):B3/1 - B3/8
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The paper presents the analysis for plane wave scattering from a grounded chiral substrate that is loaded by an array of square patches for the sake of minimizing the radar cross section (RCS) for the equipment covered by them. The analysis includes a chiral substrate with different electromagnetic parameters. It shows moderate frequency bands of good absorption for the structures presented View full abstract»

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  • HF electric field effect on Buneman's instability in a relativistic plasma waveguide

    Publication Year: 2000, Page(s):H1/1 - H1/6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The stabilizing effect of a strong HF (pump) electrical field on the Buneman instability in a plane relativistic plasma waveguide is investigated. A new mathematical technique, the separation method, is applied to the two-fluid plasma model to separate the equations, which describe the system, into two parts: temporal and space parts. The temporal (dynamical) part enables us to determine the frequ... View full abstract»

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  • Heat generated by a circular ultrasound phased array for deep seated tumor treatments

    Publication Year: 2000, Page(s):K4/1 - K4/8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Ultrasonic phased arrays are capable of producing both single or multiple focus field patterns in the patterns in the treatment volume. A circular phased array applicator used to produce the desired power deposition and temperature distributions in a multilayered concentric cylindrical model is discussed. The driving signals of the phased array are obtained by the pseudoinverse technique. The temp... View full abstract»

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  • A proposed graded band gap channel (GBGC) MOSFET

    Publication Year: 2000, Page(s):D3/1 - D311
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    In this paper we propose a MOSFET structure which limits the drawbacks of the traditional MOSFET. Moreover it is super-fast and can be operated in the GHz range. The suggested MOSFET is analyzed to prove its superior noise and high speed performance that makes it suitable to be used in GHz applications. The proposed MOSFET is realized by using the known MOSFET technology with a graded band gap cha... View full abstract»

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  • Neural network based spread spectrum PN code acquisition system

    Publication Year: 2000, Page(s):C30/1 - C3011
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A neural network based direct sequence spread spectrum code synchronization system is proposed. The's system is based on training a recurrent random neural network (RNN) model on all the possible phases of the used spreading code. The trained network can then be used at the receiver for the initial coarse alignment of the local code phase and the received code. One advantage of this technique over... View full abstract»

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