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Electrotechnical Conference, 1998. MELECON 98., 9th Mediterranean

18-20 May 1998

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  • MELECON '98 - 9th Mediterranean Electrotechnical Conference

    Publication Year: 1998, Page(s):0_2 - 0_3
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  • Table of contents

    Publication Year: 1998, Page(s):V - XVIII
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  • Design and demonstration of a vertical SSFLC coupler switch

    Publication Year: 1998, Page(s):1395 - 1398 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB)

    In this paper, we report the results of the analysis and experimentation on a thin-film surface-stabilized ferroelectric liquid-crystal (SSFLC) electro-optic waveguide switch. The optical coupling between a pair of planar waveguides is controlled by application of voltage to SSFLC film. The switch design, carried out by using beam propagation method (BPM) technique, has shown that a coupling lengt... View full abstract»

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  • Author's index

    Publication Year: 1998, Page(s):I - IV
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  • Design of a persistent operating system kernel

    Publication Year: 1998, Page(s):1304 - 1307 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The persistent operating system is the next logical step in the higher level abstraction of electronic information systems. Current operating systems do not provide an appropriate platform for building persistent systems. This naturally leads to the conclusion that an operating system especially designed to support orthogonal persistence is required. A persistent operating system will provide an a... View full abstract»

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  • Connex memories and rewriting systems

    Publication Year: 1998, Page(s):1299 - 1303 vol.2
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The aim of this paper is to offer a theoretical framework for our concept of connex memory, initially introduced as a proposal for an efficient implementation of list-oriented programming languages. The Markov Algorithms and the Lindenmeyer Grammars offer the theoretical support for the main connex memory applications: the rewriting systems. We also introduce a parallel version (with multiple acce... View full abstract»

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  • Investigations of electric power quality in the distribution power system of Republic of Macedonia

    Publication Year: 1998, Page(s):1018 - 1022 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Power quality is a growing concern both in the utility and with consumers. It has many aspects, and it is difficult to evaluate them all at the same time. This paper focuses itself mainly on the voltage distortion measurement as a main aspect of voltage quality. Possibility of voltage sags and flicker measurement is also given. At the University “Sts Cyril and Mertodij”, Skopje, Macedo... View full abstract»

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  • CORBA-based remote instrumentation

    Publication Year: 1998, Page(s):1294 - 1298 vol.2
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    Fast development in two of the most important technologies used in our proposal led to a new implementation of the concept of remote instrument access over public computer networks. As CORBA (Common Object Request Broker Architecture) is emerging into a widespread technology for interconnection of distributed objects our aim was to investigate its applicability on remote instrument access, at the ... View full abstract»

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  • A model based decomposition method for temporally overlapping evoked potential components

    Publication Year: 1998, Page(s):1449 - 1452 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The authors present a robust model-based decomposition method for temporally overlapping evoked potential (EP) components. The model assumes linear superposition of the EP constituent components, and Gaussian distributed firing instants of the neuronal population associated with each component. The decomposition provides a loss-less description of the EP complex, which is demonstrated via computer... View full abstract»

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  • Estimating the interharmonic content in the power supply system

    Publication Year: 1998, Page(s):1013 - 1017 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The international IEC 61000-4-7 standard provides guidance in harmonic/interharmonic measuring. Although it considers interharmonic measuring as a special case it does not give a systematic method for their evaluation. Basically it assumes that voltage and current signals are periodic with a frequency of 50 Hz, composed only by harmonic components. That is one of the reasons for the new amendment ... View full abstract»

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  • An improvement of synchronous CDMA techniques for fiber-optic local area networks

    Publication Year: 1998, Page(s):774 - 778 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    An extended analysis of probability of error in synchronous code-division multiple-access (CDMA) techniques for fiber-optic local area networks (FO-LAN), using modified prime sequence codes (MPSC), is presented. Particular attention is devoted to the influence of multi-user interference (m.u.i) effects on the system capacity. An improvement using an optical hard-limiter is proposed, and conclusion... View full abstract»

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  • Two-phase modulation technique for three-level inverter fed AC drives

    Publication Year: 1998, Page(s):1209 - 1213 vol.2
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Two-phase dipolar and unipolar modulation techniques for three-level inverters are suggested and compared with conventional three-phase ones. Two-phase PWMs with 60° (0° and ±30° shift) and 120° cycles are investigated from the point of view of harmonic losses, motor voltage spectra and torque pulsations. It is shown that two-phase dipolar PWMs have no advantages in comparis... View full abstract»

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  • Processor implementation for pipeline sparse matrix algorithm

    Publication Year: 1998, Page(s):1289 - 1293 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Efficient algorithms for engineering problems can be achieved by a combination of various optimization techniques. This paper presents an application of such combined approach for engineering problems involving large sparse matrices, using the example of digital filter analysis. The processor implementation of a pipeline sparse matrix algorithm demonstrates the optimization results achieved by: ef... View full abstract»

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  • Fuzzy expert system for edema segmentation

    Publication Year: 1998, Page(s):1476 - 1479 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A method for segmentation of edema region in a computed tomography (CT) image of the brain is presented in this paper. The edema region is a dark region surrounding the intracerebral brain hemorrhage (ICH) region. Edema segmentation, in general, is difficult because of very subtle grayscale variations. The proposed edema segmentation procedure consists of two major parts. Fuzzy feature extraction ... View full abstract»

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  • General comparison of the electrical transportation systems that are fed with 1×25 kV or 2×25 kV and expectations from these systems

    Publication Year: 1998, Page(s):885 - 887 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    In electrical transportation systems which are fed from interconnected AC networks, the voltage of the conductor is 25 kV, frequency is 50 Hz or 60 Hz. Power need depends on the number of the cars and the density of traffic. In modem fast trains it can be seen that the power is 12-15 MW per car. Beside technical needs, all system's economy is an important concept. Two scenarios for providing of en... View full abstract»

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  • Integrated optics on silicon for sensor applications

    Publication Year: 1998, Page(s):1444 - 1448 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    This paper presents our research in the field of integrated optics. We integrated on the same silicon chip different components (photodetectors, waveguides, couplers, interferometers, transducing layers) and realized chemo-optical sensors on one silicon chip View full abstract»

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  • Application of a genetic algorithm to multi-stage detection in CDMA systems

    Publication Year: 1998, Page(s):846 - 850 vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    In this study a hybrid approach that employs a genetic algorithm (GA) and a multi-stage detector (MSD) for multi-user detection problems in code division multiple access (CDMA) communications system is proposed. Using this approach, a genetic algorithm is used as the first stage of MSD to provide a good initial point for successive stages of MSD. Simulation results for the synchronous case are pro... View full abstract»

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  • Distribution feeder reconfiguration and compensation for loss reduction under nonsinusoidal conditions

    Publication Year: 1998, Page(s):1008 - 1012 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    This paper presents the effect of harmonic currents and reactive currents on losses. Current-related power losses may be significant, overheating wiring and reducing capacity of the power system. Harmonic reduction and reactive power compensation will save energy and release additional capacity to serve components of distribution systems. In this study, a numerical example is given for compensatio... View full abstract»

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  • Comparison of traffic control issues between regular PONs and superPONs

    Publication Year: 1998, Page(s):769 - 773 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The need to share resources for cost reduction in residential access networks, the high demand for flexibility and robustness in the local loop, and the tendency towards fewer hierarchical levels in modern networks, create a synergy favoring the concept of ATM PONs and superPONs. To realize the potential of these attractive architectures, new traffic control methods regulating the shared resources... View full abstract»

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  • An improved simulation model of a brushless DC motor drive system for industrial applications

    Publication Year: 1998, Page(s):1204 - 1208 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    An accurate and simplified model of a brushless DC motor drive (BLMD) system is presented as a simulation tool for performance related studies in industrial drive applications and for system identification in controller design. The model relies on the single Fourier series expression for pulsewidth modulation (PWM), which includes the effects of inverter dead time as a substantial part of the swit... View full abstract»

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  • PCI interface implementation using CPLD and FPGA devices

    Publication Year: 1998, Page(s):1284 - 1288 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Designing a PCI target or master interface using a CPLD or an FPGA requires special attention to the architectural details of the chip used. This paper reviews typical CPLD and FPGA architectural features relevant to implementations of PCI interfaces. We show different methods for implementing certain aspects of PCI interfaces using a minimal amount of chip resources, while staying compliant with ... View full abstract»

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  • Monitoring system for visualization of electromagnetic fields influences on humans

    Publication Year: 1998, Page(s):1471 - 1475 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The increased number of electromagnetic field sources and the growing use of electronic equipment in almost all human working areas, makes human life dependent on the quality of products that produce and/or use electromagnetic energy. Therefore, an important parameter of equipment quality becomes its capability of efficient utilization without destroying the quality of the living environment and/o... View full abstract»

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  • Behavior of synchronous generators, during the short duration voltage sags

    Publication Year: 1998, Page(s):1148 - 1151 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Voltage sags are typically caused by fault conditions. The voltage sag condition lasts until the fault is cleared by a protective device. This paper describes the causes of voltage sags on the generators. It is observed that the armature current, voltage, torque, rotor angle, excitation current of the synchronous generator are also considerably affected by voltage sags. It is shown that shunt capa... View full abstract»

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  • Switching transients in power cables

    Publication Year: 1998, Page(s):911 - 915 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    In this study, the magnitudes and the waveforms of the energisation transients induced at the receiving-end and sending-end of an underground power cable system are obtained using digital simulation. Transient voltages are first obtained in the frequency domain and then found in the time domain using a modified Fourier transform technique. The effects of various system parameters, such as cable le... View full abstract»

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  • The programme in which we calculate the motor's power, that are used in electrical transportation systems, by changing parameters of the motor's power formula and result curves

    Publication Year: 1998, Page(s):882 - 884 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    Factors which directly affect the power of the motor which will be located in the electrical vehicle, are maximum speed, travelling speed, distance between the stops, and acceleration of travelling. There is a relationship between these four factors which affect the motor power. We should keep in view the other factors which affect the power directly in order to calculate the motor power correctly... View full abstract»

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