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Electrical and Electronics Engineers in Israel, 1995., Eighteenth Convention of

Date 7-8 March 1995

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  • Eighteenth Convention of Electrical and Electronics Engineers in Israel

    Publication Year: 1995
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    Freely Available from IEEE
  • Authors index

    Publication Year: 1995
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    Freely Available from IEEE
  • Recent results in universal coding for probabilistic sources and individual sequences

    Publication Year: 1995
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (75 KB)

    Summarizes some recent work in the field of universal data compression, both from a probabilistic and a deterministic point of view. In the probabilistic setting, the data x to be compressed is generated by a source from a certain class {P(x|/spl theta/),/spl theta//spl isin//spl Lambda/}. The capacity C of the channel from /spl theta/ to a is well known to be the minimum attainable redundancy of ... View full abstract»

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  • On achievable information rates over slowly-fading channels with ideal and partial side information

    Publication Year: 1995, Page(s):1.1.1/1 - 1.1.1/3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB)

    Slowly-fading channels with ideal or partial side information on the fading levels are addressed. We focus on information-theoretic considerations, regarding two main issues: the effect of decoding delay constraints, and the effect of the amount of side information available to the receiver. Several channel models are discussed, and both new and known results are presented in a unified framework. View full abstract»

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  • Encoding mismatch in lossy source compression

    Publication Year: 1995, Page(s):1.1.2/1 - 1.1.2/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A source sequence is described by the index of the codeword in some codebook C that is closest to it according to the distortion measure d/sub 0/(x,x/spl circ//sub 1/). We study the distortion associated with reconstructing the source sequence so as to minimize the distortion measured by d/sub 1/(x,x/spl circ//sub 1/), which is in general different from d/sub 0/(x,x/spl circ//sub 0/). Using a rand... View full abstract»

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  • A technique to prove the channel coding theorem for a reduced class of codes and its applications

    Publication Year: 1995, Page(s):1.1.3/1 - 1.1.3/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The channel coding theorem for DMCs is proved using random coding. The standard proofs use the property of total randomness of the ensemble of codes. For a more restricted ensemble of codes a specific proof is needed. This has been done, for example, for linear codes, time-varying convolutional codes and for constant composition (constant type) codes. In this work we show that weaker demands on th... View full abstract»

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  • A converse theorem for the multiple description problem

    Publication Year: 1995, Page(s):1.1.4/1 - 1.1.4/4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (279 KB)

    Consider a sequence of discrete i.i.d random variables x/sub 1/,...,x/sub n/ and a distortion measure d(x,x/spl circ/) on the estimate x/spl circ/ of x. Two descriptions i(x)/spl isin/{1,2,...,2/sup nR1/} and j(r)/spl isin/{1,2,...,2/sup nR2/} are given of the sequences x=(x/sub 1/,...,x/sub n/). From these two descriptions, three estimates x/spl circ//sub 1/(i),x/spl circ//sub 2/(j) and x/spl cir... View full abstract»

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  • Parametric estimation of single morphologically varying evoked brain potentials

    Publication Year: 1995, Page(s):1.2.1/1 - 1.2.1/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (422 KB)

    We present a new parametric estimator for single Morphologically Varying Evoked Potentials (MVEP's). The estimator can detect changes in specific components within the Evoked Potential (EP) complex, extending current methods which only compensate for global latency and magnitude variations with respect to an averaged evoked response. The performance of the estimator is analyzed analytically for va... View full abstract»

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  • Functional correlates with left-right asymmetry of visual evoked potentials in stroke patients-modeling and experimental results

    Publication Year: 1995, Page(s):1.2.2/1 - 1.2.2/3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    The correlation between the FIM (Functional Independence Measure) on admission and the left-right scalp potential amplitude was studied in post-stroke patients, using flash Visual Evoked Potential (VEP) stimulation and theoretical model of the head. It was found that left-right asymmetry of the scalp VEP may be useful indices for rehabilitation in patients after brain damage. The modeling study sh... View full abstract»

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  • A comparison of neural network and Bayes recognition approaches to the diagnostic of multiple sclerosis

    Publication Year: 1995, Page(s):1.2.3/1 - 1.2.3/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (414 KB)

    This article describes the application of a Multi-Layer Perceptron (MLP) to the problem of diagnosing Multiple Sclerosis (MS). The classification information is obtained by a Trigeminal Evoked Potential (TEP) test. The performance of the MLP is compared with that of the human experts and the Bayes classifier. The efficiency of the neural network and the classical classifiers in conjunction with 4 ... View full abstract»

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  • Clustering of non-convex patterns for medical imaging

    Publication Year: 1995, Page(s):1.2.4/1 - 1.2.4/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB)

    The study treats the problem of partitional clustering of non-convex patterns of arbitrary shape, with no definite analytical description of the data. A new method for calculating the distance is defined, according to a data induced metric principle. Calculation of the distance is carried out using weighted graphs. The new distance is introduced in the fuzzy k-means algorithm, and the modified fuz... View full abstract»

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  • Disk-based video-on-demand storage servers: requirements, challenges and (some) solutions

    Publication Year: 1995, Page(s):1.3.1/1 - 1.3.1/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (462 KB)

    A video-on-demand (VOD) storage server is a parallel, storage-centric system used for playing a large number of relatively slow streams of compressed digitized video and audio concurrently. Data is read from disks in relatively large chunks, and is then "streamed" out onto a distribution network. The primary design goal is to maximize the ratio of the number of concurrent streams to system cost wh... View full abstract»

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  • A framework for type system definition and manipulation in C++

    Publication Year: 1995, Page(s):1.3.2/1 - 1.3.2/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    Meta-programming sets its goal in treating programs as data objects, and as such, manipulating and modifying them. We describe a framework that provides an essential part of a meta-programming environment, namely types. We have implemented an extendible class library in C++ that presents types as first class values, and uses a simple syntax to allow easy definition, creation and manipulation of ty... View full abstract»

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  • Visualizing programs using graphs

    Publication Year: 1995, Page(s):1.3.3/1 - 1.3.3/4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (310 KB)

    Graphs seem to be a natural way to represent various aspects of program execution. And therefore, graphs are commonly used by software visualization to display, interpret, document and convey the static and dynamic nature of program execution. The major obstacles which must be considered before graphs can be used in software visualization tools, are the conceptual problems, that is, the difficulty... View full abstract»

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  • A verification scheme for pipelined vector architectures

    Publication Year: 1995, Page(s):1.3.4/1 - 1.3.4/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB)

    As a means for improving performance, advanced vector processors use an extension of pipelining, called vector chaining, whereby the execution of independent instructions is overlapped. The complexity of vector chaining architectures, together with their inherent parallelism and asynchrony, renders their verification extremely difficult. This paper presents an efficient simulation-based scheme for... View full abstract»

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  • The Parallel Booster: software architecture and optimization results

    Publication Year: 1995, Page(s):1.3.5/1 - 1.3.5/4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    The Parallel Booster is a software package to enable the development of parallel programs literally in a couple of months, and to allow full run-time exploitation of the installed computer base by means of a set of unique functions. The architecture of the Booster and some of these functions are succinctly described. As a concrete proof of the Booster power, the parallelization of an actual applic... View full abstract»

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  • A study of finite size power isotropic radiators

    Publication Year: 1995, Page(s):1.4.1/1 - 1.4.1/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A class of localized current sources that radiate power isotropically is presented. Their far-fields are given as well as the symmetries of the associated polarization distributions, and, in addition, the multi-pole expansion of the fields of these radiators is calculated. View full abstract»

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  • A numerical absorbing boundary condition for finite element analysis

    Publication Year: 1995, Page(s):1.4.2/1 - 1.4.2/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    In this paper we present a novel approach to deriving local boundary conditions that can be employed in conjunction with the Finite Element Method (FEM) to solve electromagnetic scattering and radiation problems. The proposed Numerical Absorbing Boundary Condition (NABC) approach can he applied to both the nodal and the edge-based formulations of the FEM. The key step in the NABC approach is to de... View full abstract»

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  • Improving impedance matrix localization by a digital filtering approach

    Publication Year: 1995, Page(s):1.4.3/1 - 1.4.3/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Wavelet bases have been employed recently in numerical solutions of integral equations encountered in electromagnetic scattering problems. The advantage of these bases lies in their ability to render the problem impedance matrix more localized. In this paper, we propose a digital filtering approach for integrating wavelet transforms into existing electromagnetic-scattering numerical-solvers. The s... View full abstract»

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  • Circular polarization microstrip array on a conical surface

    Publication Year: 1995, Page(s):1.4.5/1 - 1.4.5/3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Antenna elements based on microstrip technology are low profile, conformal, low weight and low cost, as such they are commonly used in many applications. Lately, extensive effort was devoted to compute the radiation characteristics of microstrip elements on flat and cylindrical surfaces, but only minor attention has been given to the analysis of microstrip elements on a conical surface. Such a geo... View full abstract»

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  • Matrix thinning with reduced field testing (RFT)

    Publication Year: 1995, Page(s):1.4.6/1 - 1.4.6/4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (306 KB)

    A number of methods have been proposed recently for the generation of sparse, rather than dense matrices in the context of integral equations. Most notably, we refer to Canning's impedance matrix localization (IML), the wavelet expansion, the fast multipole method (FMM), and the use of uni-directional basis functions, including a dual source representation and the complex multipole beam approach. ... View full abstract»

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  • Digital simulation of transient phenomena in power transformers

    Publication Year: 1995, Page(s):1.5.1/1 - 1.5.1/5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB)

    The switching of a power transformer to a source (electric power system) from one side leads to the occurrence of inrush currents. Typical for these currents when all other windings of the transformer are open-circuited is the following: the peak values are higher than the rated currents, the curves are highly unsymmetrical and diminish faster than the short-circuit currents. These characteristics... View full abstract»

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  • Domains of ferroresonance occurrence in voltage transformers with or without damping reactors

    Publication Year: 1995, Page(s):1.5.2/1 - 1.5.2/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (397 KB)

    This paper is aimed at investigating the circumstances under which ferroresonance is liable to occur in a 400 kV Gas Insulated Substation (GIS) equipped with inductive voltage transformers, and at establishing the efficiency of damping reactors connected to the secondary winding of these transformers in order to improve the damping of the ferroresonance or to avoid its appearance. The paper outlin... View full abstract»

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  • Analysis of a photovoltaic water pumping system

    Publication Year: 1995, Page(s):1.5.3/1 - 1.5.3/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB)

    A solar powered photovoltaic water pumping system has been installed and field tested at James Cook University of North Queensland, Australia. The results of the experiment are discussed based on field measurements and computer modeling of the various system components in order to investigate the efficiency of each component and the performance of the entire system. View full abstract»

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  • Superconducting inductive current limiter as a power system component

    Publication Year: 1995, Page(s):1.5.4/1 - 1.5.4/5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (477 KB)

    One promising option for the current limiter is a device based on a fast transition of a superconducting material from the superconducting state with zero resistance to the normal state with pronounced resistance. The superconducting current limiting device being developed by us is based on an idea of inductive coupling of an active high critical temperature superconducting element to the power ne... View full abstract»

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