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

24-24 Feb. 2000

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  • Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)

    Publication Year: 2000
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    Freely Available from IEEE
  • Author list

    Publication Year: 2000, Page(s):705 - 708
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    Freely Available from IEEE
  • Wire-loaded monopole antenna

    Publication Year: 2000, Page(s):B19/1 - B19/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A new antenna is proposed for use in mobile communication systems. Detailed investigations are presented through the results obtained using numerical simulation (the method of moment technique). The wire-loaded monopole antenna has proved many attractive features so that it is recommended to be used in hand held units. The design of the antenna considers simplicity, compact size (65% of monopole h... 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 mixed methods for the analysis of a multimode optical rib waveguide

    Publication Year: 2000, Page(s):B17/1 - B1711
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    A new technique is developed for calculating the dispersion characteristics and field distribution of a multimode rib optical waveguide. The technique is based on the combination of the effective index and the variational methods. An algorithm is implemented to study the effect of the structure parameters and dimensions on the dispersion curves for quasi-TE and TM-modes of a rib optical waveguide.... 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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  • Advanced system for automating eddy-current nondestructive evaluation

    Publication Year: 2000, Page(s):H5/1 - H5/8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Various nondestructive evaluation (NDE) techniques are widely used in the inspection of sub-surface flaws. This paper introduces the results of a research conducted to enhance the performance of eddy-current nondestructive evaluation (ECNDE) by developing an integrated computer based system. Advantages of this system include increasing test speed, while avoiding errors due to human factors. The sy... View full abstract»

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  • Modelling and analysis of coplanar waveguide for LiNbO3 optical modulators

    Publication Year: 2000, Page(s):B16/1 - B1611
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Hybrid-mode analysis is carried out for coplanar waveguide applicable to Z-cut Ti:LiNbO3 optical modulators. The analysis is based on the integral equations. Generalized trial quantities are introduced as virtual adjustable sources in the equivalent network representation of the structure. The microwave effective index and the characteristic impedance as a function of the operating freq... View full abstract»

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  • A fingerprint classification technique using multilayer SOM

    Publication Year: 2000, Page(s):C26/1 - C26/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    This paper presents an automatic fingerprint classification technique similar to that reported by Ongun and Halici (see Proc. of IEEE vol.84, no.10, p.1497-12, 1996) but, an inverse filtering technique was introduced to restore the distorted parts of the images prior to the feature extraction stage. The results have shown that introducing the inverse filtering stage has improved the percentage of ... 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 robot nuclear application

    Publication Year: 2000, Page(s):H4/1 - H4/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper presents the replacement of the conventional manipulators in the hot cells of the ET-RR-1 nuclear research reactor by a robot, to prevent involved personnel from being exposed to nuclear radiation hazards. In this respect, the educational robot HERO 2000, after being coupled to a PC, and provided with a sensing mat which is known as the force sensing array (FSA), is programmed to be abl... 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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  • A blind signature scheme based on ElGamal signature

    Publication Year: 2000, Page(s):C25/1 - C25/6
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The use of public key cryptosystems has received considerable attention. They are beneficial in encryption as well as signing which plays an essential role in electronic banking and financial transactions. This paper presents a new generalized blind signature scheme based on ElGamal (1985) signatures. This new scheme has a valuable property that assures that if a message is signed multiple times, ... View full abstract»

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  • Application of FDTD method for kidney microwave hyperthermia using annular phased array

    Publication Year: 2000, Page(s):K3/1 - K3/6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The finite difference time domain (FDTD) method is used to determine the electromagnetic power distribution and calculate the specific absorption rates (SARs) inside human body. In this paper, this method is applied to evaluate SAR in an inhomogeneous tissue which has a cylindrical shape. An annular phased array (APA) consisting of eight dipoles is used to focus the SARs inside the model. A deioni... View full abstract»

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  • Microwave high power MSM PD at 1.55 μm with optimal gradual heterojunction

    Publication Year: 2000, Page(s):H3/1 - H3/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Using a 2-D physical model we present a theoretical study of the parameters that affect the saturation condition of an MSM PD under high optical power at 1.55 μm wavelength modulated at 40 GHz. We also report that, with an MSM operating at 40 GHz, we can expect a saturation limit with a maximum microwave power of 17 dBm due to the space charge effect 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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  • Effect of turbulence on underwater targets recognition

    Publication Year: 2000, Page(s):F2/1 - F2/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    This paper provides an analysis of the echo structures returning from underwater targets, then it describes the effect of turbulence on underwater target recognition. The sonar signal recognition system deals with the echoes received from complex geometrical shapes of underwater targets. Practical measurements were carried out in the Naval Research Center (NRC) in Alexandria that is supported by a... View full abstract»

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  • Transmission and reflection of TE electromagnetic X-wave normally incident on a lossy dispersive half-space

    Publication Year: 2000, Page(s):B11/1 - B1112
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    The problem of transmission and reflection of TE electromagnetic X-waves normally incident on a lossy dispersive half-space is investigated. Such X-waves are represented as a superposition of pulsed plane waves in all azimuth directions and tilted by a constant angle with respect to the X-wave propagation direction. The problem of transmission and reflection of pulsed TE electromagnetic plane wave... View full abstract»

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  • FDTD analysis of patch antenna over a multi-layer substrate

    Publication Year: 2000, Page(s):B1/1 - B110
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    In this paper, rectangular microstrip patch antenna over a multi-layer substrate configuration is presented. This patch antenna configuration improves the bandwidth and the radiation pattern of the patch. The finite-difference time-domain (FDTD) method with perfectly matched layer absorber (PML) as well as Mur's (1981) first order absorbing boundary conditions (Mur's FOC) is applied to determine t... 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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  • ATROS: a simulator for the design and analysis of ATM networks and protocols

    Publication Year: 2000, Page(s):C13/1 - C13/7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    This paper introduces a simulation tool that could be used for the design and analysis of ATM networks and protocols. The simulator was developed in C++ programming language and compiled on a DOS/Windows platform. It is a discrete-event simulator that has a user-friendly graphical user interface (GUI). The simulator has been tested and validated under different operational scenarios and... View full abstract»

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  • Restoration of multichannel images with limited a priori information using multichannel parallel-like adaptive filters

    Publication Year: 2000, Page(s):C18/1 - C1810
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    We introduce a heuristic method for adaptive multichannel restoration of degraded multispectral images when there is limited knowledge about the undegraded images and the noise. The proposed structure aims at reversing the action of the blur function on the image. The system uses number of channels equal to the number of multispectral images L. Each channel consists of L subchannel structures of t... View full abstract»

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  • An efficient algorithm to partition the combinational circuits for pseudoexhaustive testing

    Publication Year: 2000, Page(s):C24/1 - C2411
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    We have presented an efficient algorithm to partition the combinational circuits for built-in pseudoexhaustive self-testing of VLSI circuits. The partitioning procedure is based on several heuristics that enable the procedure to overcome the unexpected results of the greedy heuristic procedure View full abstract»

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  • Automatic segmentation and labeling of human brain tissue from MR images

    Publication Year: 2000, Page(s):K2/1 - K2/8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    This work presents a technique for automatic tissue labeling of 2-D magnetic resonance (MR) images of the human brain. This technique consists of two components: an unsupervised clustering algorithm and a knowledge-based technique. The knowledge-based technique contains information on the cluster distribution in feature space and tissue models. This approach also provides a first step toward class... View full abstract»

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  • Mobility detection and tracking of surface emitters at a tactically acceptable airborne ESM altitudes

    Publication Year: 2000, Page(s):C28/1 - C28/8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The use of airborne electronic support measures (ESM) system to detect and track mobile emitters is vital in military operations because of its importance in emitter identification and threat evaluation in a highly dense electromagnetic environment. The aim of this paper is to study whether the three dimensional inputs of azimuth, elevation, and height to an ESM system can detect and track surface... View full abstract»

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