[1991 Proceedings] 6th Mediterranean Electrotechnical Conference

22-24 May 1991

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  • 6th Mediterranean Electrotechnical Conference. Proceedings. (Cat. No.91CH2964-5)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (115 KB)
    Freely Available from IEEE
  • Adjustable windows for the design of FIR filters - A tutorial

    Publication Year: 1991, Page(s):28 - 33 vol.1
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB)

    The use of four adjustable window functions for designing FIR filters is reviewed. The windows under consideration are the Dolph-Chebyshev window, which minimizes the peak sidelobe ripple of the window's frequency response, and the J.F. Kaiser (1975) and T. Saramaki (1989) windows, which nearly minimize the energy in the sidelobes. As a fourth alternative, an adjustable window function is introduc... View full abstract»

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  • A generalized serial approach to offset QAM-type modulations

    Publication Year: 1991, Page(s):566 - 569 vol.1
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (185 KB)

    A serial approach to the generation and detection of offset M-ary QAM-type signals is presented which extends the technique proposed by F. Amoroso and J. Kivett (1977) for MSK. In all cases considered, serial implementations exhibit a lower sensitivity to imperfect carrier synchronization than the corresponding parallel implementations. Some numerical results concerning the performance of serial O... View full abstract»

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  • Influence of a dielectric overlay layer on integrated optics phase modulators

    Publication Year: 1991, Page(s):684 - 687 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (239 KB)

    Performance of external electrooptical modulators and switches is enhanced by introducing a dielectric overlay covering the modulating electrodes. These are in the configuration of two coupled traveling-wave microstrips, and the bandwidth is evaluated by combining the orthonormal even and odd modes pertaining to the microwave waveguide. The modulation efficiency is compared in Y- and Z-cut lithium... View full abstract»

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  • A control theory view on systems discrete by nature

    Publication Year: 1991, Page(s):820 - 823 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Details of an analytical approach, based on an analogy with Petri nets, to the modeling and control of systems which are discrete by nature-the so called discrete events dynamical systems (DEDSs)-are presented. The DEDSs change their states owing to asynchronous discrete events, and many of their elementary subactivities, e.g., elementary operation of flexible manufacturing systems, may be concurr... View full abstract»

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  • A model for synthesis process

    Publication Year: 1991, Page(s):1049 - 1056 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A model for the synthesis problem is developed. It is shown that the synthesis process can be composed for synthesis primes for decomposition, interpretation, and structuring, and driven with synthesis goals. By incorporating synthesis goals as decision parameters, the degree of nondeterminism can be reduced to an acceptable one. A built-in learning algorithm can additionally reduce synthesis proc... View full abstract»

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  • Neural networks in control systems

    Publication Year: 1991, Page(s):816 - 819 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    A modified backpropagation algorithm with a linear output function is discussed from the viewpoint of its convenience in control tasks. Two methods are presented for teaching neural networks to act as an inverse plant. In the simulation example a discrete integrator was used as the plant. The best results were obtained by a combination of both methods View full abstract»

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  • Feature selection via orthogonal expansion of MEG signals

    Publication Year: 1991, Page(s):786 - 788 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The processing of magnetoencephalogram (MEG) signals via orthogonal expansion is examined. The Karhunen-Loeve expansion is used as a tool for feature selection in order to lower the dimensionality of the data and achieve data compression. Data reduction achieved through this method is approximately 6:1. A comparison with the data reduction achieved via autoregressive modeling is made, and the adva... View full abstract»

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  • Formal approach to reusable formal specifications

    Publication Year: 1991, Page(s):1045 - 1048 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The theory of reusable formal specifications is described, especially in the context of modeling a distributed real-time telecommunication system. Various aspects of reusability are covered: formal representation of reusability, modular specification of the system, equivalence of formal specifications, and classification of specifications. Some modular reusable protocol specifications are also giv... View full abstract»

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  • Design of digital control system using the sampling period as a compensator

    Publication Year: 1991, Page(s):812 - 815 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Ideas are presented for using the sampling period as an additional parameter to permit the control of a digital control system. In this class of systems the sampling period becomes an important parameter to guarantee the stability and to modify widely the specification in a design problem. A modified root locus approach has been used and the sensitivity of the poles in the closed loop system is ex... View full abstract»

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  • A simple analysis of MIC transmission lines and discontinuities with multilayered anisotropic media

    Publication Year: 1991, Page(s):146 - 149 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A general and simple method for analysis of the planar transmission lines and their discontinuities with multilayered anisotropic media is presented. The method is based on a quasi-static approach, using the charge simulation method and the space-domain Green's function of some fictive electrical charges. The procedure is novel from two points of view. First, an improvement of the space-domain Gre... View full abstract»

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  • Optimal QRS detection algorithms

    Publication Year: 1991, Page(s):782 - 785 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Performance measures to compare QRS detection algorithms are suggested and evaluated. The measures are used to compare various linear and nonlinear filters and to determine optimal threshold levels. In low error cases the separation divergence is suggested as a performance measure. For single lead systems this measure becomes an F-ratio measure. A database of more than 2700 complexes is used. With... View full abstract»

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  • An adaptive fractional T/2 equalizer for high-efficient telephone channel data modem

    Publication Year: 1991, Page(s):464 - 467 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The T/2 fractional passband equalizer, developed for a modem following V.32 and V.33 CCITT recommendations, is presented. The block LMS algorithm controls all adaptive equalizer parameters. This algorithm attains the same performance as a standard LMS, but is computationally less complex due to a more efficient use of signal processor capabilities. An important feature of this equalizer is the ada... View full abstract»

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  • Automatic program restructuring

    Publication Year: 1991, Page(s):1041 - 1044 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The method of automatic transformation of sequential programs to parallel ones is discussed. Two types of dependences (data and procedural) are defined and utilized. As a program model, the idea of program trajectories is used. Depending on the number of accessible processors, the analytical process can be applied to different program levels View full abstract»

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  • Electromagnetic modeling of chiral planar integrated structures

    Publication Year: 1991, Page(s):647 - 650 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    An electromagnetic model of a planar stratified structure with an isotropic chiral grounded slab under planar electric excitation conditions is presented. The solution is obtained by using the multidimensional Fourier transform applied to the partial differential equations describing the electromagnetic field, and expressed in terms of dyadic (electric and magnetic) Green's functions. Equivalent c... View full abstract»

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  • Prediction of dynamical phenomena by a neural network

    Publication Year: 1991, Page(s):18 - 23 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    An adaptive information processing system capable of predicting dynamical phenomena is described. It includes a neural network-like memory, a predictor, two shift registers, and a comparator. In the memory, an internal empirical model of observed phenomena is formed. It is described by a set of memorized prototype transitions between successive states of an input time-dependent signal which can al... View full abstract»

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  • Fuzzy control of a nonlinear plant: the case of a fluid mixer

    Publication Year: 1991, Page(s):807 - 811 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    A study is made of the qualitative control of an intrinsic nonlinear plant, a fluid mixer, using a theory of fuzzy control that is presented in a functional way. The mixer is cylindrical, with two fluid inputs of different coloration and an output of the resulting mix. The main points studied are the response of coloration when the desired color is changed and when the output flow changes. The sim... View full abstract»

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  • Uncertain knowledge processing in urology diagnostic problems based expert system

    Publication Year: 1991, Page(s):741 - 743 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    An expert system that assists in diagnostics of uropoetic system dynamic disturbances has been developed. The program was developed in several modules. It enables one to perform m-u-q transform of basic probability joints into q-function values. Entered data are added to the initial database and used in the learning process of the system. As a result, a high-ac... View full abstract»

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  • Computation of electromagnetic transients in underground cables and overhead lines using the superposition principle and exponential Fourier transform

    Publication Year: 1991, Page(s):1457 - 1461 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Computation of electromagnetic wave propagation in multiconductor systems using the superposition principle and exponential Fourier transform is presented. This is a new approach which takes into account all frequency-dependent effects of the transmission system. The impulse response is calculated in the phase domain using the exponential Fourier transform. Selection of integration parameters for ... View full abstract»

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  • The development of a bio-engineering research centre at the University of Ulster

    Publication Year: 1991, Page(s):1526 - 1529 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The Bio-Engineering Research Centre at the University of Ulster, created in January 1986, has now become established as a major research centre for the whole of Northern Ireland. Close links have developed with a number of local hospitals to support research and development related to clinical needs. The Centre has now grown to encompass seven major areas of expertise and supports a growing number... View full abstract»

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  • Interaction of electromagnetic waves with finitely conductive cylindrical electrodes of arbitrary cross-section

    Publication Year: 1991, Page(s):142 - 145 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The excitation and scattering of electromagnetic waves by a number of cylindrical bodies of arbitrary cross-section are analyzed. The electrodes are assumed to be embedded in an isotropic medium that may or may not be unbounded. The solution relies on the boundary element method (BEM) which results from an integral formulation of the electromagnetic field equations. The isotropic bodies consist of... View full abstract»

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  • Electronic simulation of thermal features of human skin

    Publication Year: 1991, Page(s):779 - 781 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    For modern electrosurgery, grounding pads are required for current feedback to the HF-generator. In contradiction to the cutting needle in the surgeon's hand, this grounding pad must not heat up the patient's skin. This effect can be avoided by a grounding pad of sufficient size, uniformly distributed conductivity, sufficiently low total resistance, and sufficient means against detachment of the p... View full abstract»

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  • Echo canceller using controlled-length transversal filter

    Publication Year: 1991, Page(s):460 - 463 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The adaptive LMS transversal filter with controlled-length for an echo canceller, used in full-duplex two-wire digital transmission on digital subscriber loops, is presented. The theoretical analysis and; simulation; results show that the two-stage method and the controlled-length filter accelerate the convergence speed of the echo canceller View full abstract»

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  • Economic justification of small cogeneration systems for homes or small business: a case study

    Publication Year: 1991, Page(s):1489 - 1492 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    The possibility of energy conservation through the application of cogeneration methods in homes or small businesses in Greece is explored. Two alternatives are compared. The first situation is where a hot water heater is used and electricity is bought from a utility to meet energy needs. The second alternative is the use of a cogenerator to produce hot water and electricity, with all excess electr... View full abstract»

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  • On integrated finite element modelling

    Publication Year: 1991, Page(s):965 - 968 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A new integrated approach for finite element modeling is presented in which a treelike data structure is set up as a framework for shape acquisition, geometric modeling, frontal solution and scientific visualization. A modeling environment based on the quadtree approach is discussed. The system accepts either a geometric or digitized description of the object to be analyzed and generates a valid d... View full abstract»

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