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Electrotechnical Conference, 1991. Proceedings., 6th Mediterranean

Date 22-24 May 1991

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Displaying Results 1 - 25 of 382
  • 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
  • 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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  • Ultrasonic echo tomography of head: simulation

    Publication Year: 1991, Page(s):771 - 774 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    An ultrasonic echo tomography method has been developed for in vivo imaging of human head. The method involves only a single transducer and a single scan around a target, which makes a simple configuration possible. A fan-beam approach is adopted to data acquisition resulting in a larger image area of the target. In addition, only echoes coming from between the transducer and the center of revolut... View full abstract»

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  • Perspectives of the Wiener-Volterra approach to the modelling of ankle joint movement

    Publication Year: 1991, Page(s):767 - 770 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Dynamic modeling of the ankle joint is performed by means of the non-parameteric Wiener-Volterra approach. The original version is extended so that colored noise inputs can be handled. This is imposed from reality, i.e., all movements of the angle joint must be limited in frequency as well as in amplitude. Experiences related to the method are briefly summarized and supported with results obtained... View full abstract»

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  • Usage of analog-hybrid and digital simulation in pharmacokinetics

    Publication Year: 1991, Page(s):763 - 766 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The possibility of combining analog-hybrid computers and digital simulation languages in all phases of pharmacokinetic model development, evaluation, and usage is discussed. The pharmacokinetic study of ciprofloxacin illustrates the application of an EAI-2000 analog parallel processor and the digital simulation language SIMCOS. Conclusions concerning simulation tools for pharmacokinetic models are... View full abstract»

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  • A gradient-directed adaptive algorithm for synchrotron radiation angiography

    Publication Year: 1991, Page(s):759 - 762 vol.1
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    An adaptive algorithm for the processing of digital subtraction angiographies obtained via synchrotron radiation is presented. In order to enhance the coronary arteries hidden by the heart chambers and the aorta, an adaptive high-pass filter is used. For each pixel of the image, the size of the filter is chosen according to the value of a gradient operator, which is computed over a large window ce... View full abstract»

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  • Design of optical storage elements

    Publication Year: 1991, Page(s):688 - 691 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The proposed design of an all-optical packet switching system is discussed. The main optical elements used in this design are optical interference filters (IFs) and mirrors. These optical IFs are based on the Fabry-Perot etalons and can operate in three different modes: transmission, reflection, and absorption. These IFs have been experimentally shown to process data carried by a light beam in as ... View full abstract»

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  • EMG biofeedback system

    Publication Year: 1991, Page(s):756 - 758 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    An EMG biofeedback device is presented along with preliminary data on the feasibility for testing this device in a clinical setting. This device deals with relaxation control and contraction of the skeletal muscle. Properly prescribed uses of the device include relaxing muscle spasms and re-educating muscles after a stroke. This second-generation EMG biofeedback device uses a constant-current biph... View full abstract»

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  • Analytic description of transient processes in nonlinear dynamic systems with atypical nonlinearities

    Publication Year: 1991, Page(s):939 - 941 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    A method for the analytic description of transient processes in nonlinear dynamic systems with atypical nonlinearities is proposed. It assumes that the phase-plane trajectory of the dynamic system of interest is known. The only restriction of the method imposed on the phase-plane trajectory is that it should be a step-by-step continuous one. Then, by approximating the phase-plane trajectory step-b... View full abstract»

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  • The role of analog simulation in the hybrid simulation system

    Publication Year: 1991, Page(s):884 - 887 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    A hybrid simulation system consisting of a EAI 2000 parallel processor and an IBM AT compatible personal computer with the ability to program the analog part from the digital computer is described. Both parts of the hybrid system are connected through Burr Brown's PCI 20000 interface and RS232 serial line. The software module for the analog part of the hybrid system makes it easier to work with th... View full abstract»

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  • Detection of periodic micro movements of the head using a flat sensors system

    Publication Year: 1991, Page(s):752 - 755 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A device for the frequency measurement of micromovements of the head is described. The system uses two flat eddy current proximity sensors. They are included in oscillators whose frequencies are a function of target sensor distance. The first sensor realizes the head micromovements measurement. The second one eliminates the breathing movement. A set of about one hundred tests on healthy subjects s... View full abstract»

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  • EXPAC: a parameter extractor and electrical verifier for VLSI ICs

    Publication Year: 1991, Page(s):252 - 254 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    A parameter extractor for VLSI circuits that obtains the electrical description from the layout geometry is described. The extractor includes an electrical-to-electrical comparator to verify the circuit by matching the components with a user-supplied description. It can be customized to any NOS or CMOS technology using a technological file. The basic algorithm is described, and the results obtaine... View full abstract»

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  • Influence of the laser optical resonance on the binary direct detection equalized optical receiver performance

    Publication Year: 1991, Page(s):680 - 683 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    Using a simple model for laser optical resonance, the performance of a binary direct detection equalized optical receiver is presented, assuming as a photodetector a PIN diode in a circuit-noise-dominant situation. The normalized dimensionless bandwidth integrals I 2 and I3 defined by S.D. Personick (1973) are evaluated in typical cases that allow the study ... View full abstract»

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  • Model-based, delay-tolerant teleoperation in unstructured environments

    Publication Year: 1991, Page(s):908 - 911 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The problem of teleoperation in the presence of communication delays is addressed. Because of the delay in obtaining position and force feedback from the remote slave arms, direct teleoperation is not feasible. A combination of computer graphics and manipulator programming is proposed to solve the problem by allowing the operator to kinesthetically, as well as visually, interact with a graphical s... View full abstract»

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  • Towards the statistical modelling of robotic manipulators

    Publication Year: 1991, Page(s):935 - 938 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A new approach to the modeling of robot manipulators is presented. Usually, system descriptions are based on a set of differential equations which, due to their nature, lead to very precise results and strategies. However, they need laborious computations, and, therefore, methods based on alternative mathematical concepts are required. The proposed statistical model overcomes these problems and gi... View full abstract»

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  • Scheduling of batch chemical reactors on parallel production lines

    Publication Year: 1991, Page(s):880 - 883 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The scheduling problem for a set of chemical reactors on parallel production lines is considered. The problem is to determine the most suitable batch sequence and the corresponding time-table of batch operations. The solution algorithm is based on the permutation of the digester sequence and linear optimization of the batch schedule. The simulation results obtained are a good basis for implementin... View full abstract»

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  • From numerical to symbolic computation-modern perspectives for computer aided education in control engineering

    Publication Year: 1991, Page(s):1548 - 1551 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The authors describe the stages of a methodology employed to acquaint students in automatic control with the opportunities presented by symbolic calculus in formulating computerized versions for many notable theoretical results, which become powerful design tools. A symbolic mathematics package devoted to control problems was developed. Some illustrative laboratory experiments allow a thorough und... View full abstract»

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  • Comparison of the CMOS and BiCMOS simple architecture operational amplifier

    Publication Year: 1991, Page(s):299 - 302 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    An operational amplifier BiCMOS design technique is implemented to improve overall CMOS characteristics. An analysis is performed of the architecture operational amplifier for 1-μm BiCMOS technology. A comparison between a CMOS and BiCMOS operational amplifier is performed and verified by the circuit-level simulator SPIC. It is shown that in order to improve BiCMOS operational amplifier deficie... View full abstract»

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  • A noninvasive system for backbone diagnostics

    Publication Year: 1991, Page(s):748 - 751 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    A system for backbone diagnostics is presented. It is based on a simple hardware configuration and is designed for frequent, noninvasive screening of patients. A software library which enables easy communication between physician, patient and stored backbone pictures and other available data is provided View full abstract»

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  • The probability of error performance of Reed-Solomon codes over q-ary nonsymmetric channels

    Publication Year: 1991, Page(s):610 - 613 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The performance of the binary symmetric channel (BSC) together with an RS code over GF(q) is assessed and compared to that of a q-ary symmetric channel (QSC) used with the same code. The results indicate that, with coding, the loss in performance of BSC as compared to that of QSC, remains within 20% of the uncoded case as far as the error probability performance is concerned. The... View full abstract»

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  • Layout-level techniques for testability improvement of MOS physical designs

    Publication Year: 1991, Page(s):248 - 251 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A methodology for physical testability assessment is reviewed, and a technique to enhance the physical testability of ICs with BIST (built-in self test) is presented. It is shown that an appropriate choice of a primitive polynomial can improve the realistic fault coverage, obtained with pseudorandom test patterns or, conversely, can lead to reduced test lengths, for the same fault coverage. The re... View full abstract»

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  • Optimization of high impedance optical receivers

    Publication Year: 1991, Page(s):676 - 679 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The performance of a simple post-differentiation filter is compared with that of a Nyquist raised-cosine filter with a roll-off factor of one when they are used as equalizers in pin-FET receivers. It is shown that, for a high dispersion optical fiber, the Butterworth filter presents better results than the Nyquist filter for optimum values of its cut-off frequency View full abstract»

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  • Computer-aided graph-network path-motion recognition in robotized MIMO FMS structures

    Publication Year: 1991, Page(s):904 - 907 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A computer-assisted methodology that permits convenient and simple CAD procedures for FMS-like systems has been developed. It is aimed at modeling, simulation and analysis of FMS (flexible manufacturing system) functional models with respect to the design of scheduling coordination controls. The methodology is based on the digraph or Petri network formalisms and situation or event-status recogniti... View full abstract»

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  • VSS theory in a control synthesis of robots with AC drives

    Publication Year: 1991, Page(s):931 - 934 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    A control approach is proposed for robust, accurate trajectory tracking of manipulators based on the variable-structure system (VSS) theory. A problem of the incorporation of AC drives with switching torque control into a robot system is discussed View full abstract»

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  • In-circuit simulation of industrial processes with personal computers

    Publication Year: 1991, Page(s):876 - 879 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The principle of in-circuit simulation, with PCs is described and shown for two cases. In the first case, for oil-fired central heating with low power (<120 kW), the boiler- and the heat-temperature-control of the heating system are presented. The house and the heating system were simulated on a PC. In the second case, the combustion control of a medium-sized industrial boiler (20 MW) is presen... View full abstract»

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