4-7 Apr 1993

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Displaying Results 1 - 25 of 136
  • Recent developments in distributed feedback and distributed Bragg reflector lasers for wide-band long-haul fiber-optic communication systems

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    The requirements for optical sources used in long-haul fiber-optic communication systems are related to the characteristics of single-mode silica fibers operated at 1.55 μm. The elementary concepts of distributed feedback (DFB) and distributed Bragg reflector (DBR) lasers are explained. Grating resonators and reflectors are described, and the theory of the frequency-selective property of corrug... View full abstract»

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  • Effect of corona preionization on the nitrogen laser energy

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Most configurations of the nitrogen laser suffer from a relatively low energy output and poor stability. A corona plate on top of the laser electrodes improved energy output and the stability to a certain extent. A coaxial Blumlein concept was incorporated in the laser electrodes to minimize the electromagnetic interference associated with the fast transit discharge. Distance between the corona pl... View full abstract»

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  • ISDN based industrial and educational applications

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The authors discuss the BRI (basic rate interface), the PRI (primary rate interface), and BISDN (broadband integrated services digital network) and the scope of these in industrial, commercial, residential, and educational applications. Wherever applicable, migration from BRI to PRI to BISDN is also discussed View full abstract»

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  • Estimate of high-order linear system with identical design specifications

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A novel technique for obtaining low-order estimates of a high-order linear system is proposed. This meets the need for a computationally efficient and conceptually simple algorithm which will yield an estimate of a high-order linear system appropriate for system design purposes. The proposed technique will guarantee that the commonly used system design specifications are identical for both plant a... View full abstract»

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  • An advanced dataflow processor architecture based on a multiple input node concept

    Publication Year: 1993
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A novel dataflow concept, multiple input node, is introduced to overcome the performance and efficiency degradation problems that exist in the current dataflow computation models. Multiple input node is a new computation code which has 4 inputs; hence it can accept up to 4 token packets at a time. The unique architecture of the multiple input node reduces the number of token packets in the system ... View full abstract»

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  • Qualification of electronic card assemblies

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    As part of the cost of developing a new product, product managers are often willing to pay for qualifying unknown components or subassemblies for their application, in order to ensure that their product will last for its intended life and quality requirements. However, they are unwilling to pay excessive costs over an unacceptable time period to obtain this information. As a result, the Technical ... View full abstract»

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  • An algorithm for parallel hardware accelerated switch level fault simulation

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The complexity and large simulation time for switch level fault simulation has been addressed by performing two-dimensional parallel fault simulation using a parallel hardware accelerated fault simulator (PHAFS). The authors present an algorithm and complexity measure for parallel fault simulation as extended to the switch level. Using nine-valued logic, reverse level ordering, and the PHAFS, the ... View full abstract»

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  • Adaptive tracking control of a brushless DC motor driving an inertial load

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The tracking problem for a brushless direct current (BLDC) motor driving a load is addressed. Based on the nonlinear models of the motor and load, an adaptive controller is presented which gives a global uniform asymptotic stability (GUAS) result for motor position/velocity tracking error. The control is capable of handling parametric uncertainty throughout the entire electromechanical system dyna... View full abstract»

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  • Decision making with neural networks

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A neural network for distributed decision making is proposed. This decision making is a team effort, where a final decision-making neuron receives inputs from a set of consultant neurons. The consultant neurons range from `lenient' to `strict', depending on their firing thresholds, and have continuous outputs. The final decision-making neuron has binary output. The proposed network is envisioned a... View full abstract»

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  • An object-oriented approach to robotic motion

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The authors describe the application of object-oriented design technqiues to the problem of using a pair of heath robot arms to play a game of checkers. They introduce object-oriented design (OOD) and describe some of the strengths and features of this methodology. Brief descriptions of the Heath Robot Arm and of the mathematics of manipulating this robot follow. Finally, the application of OOD te... View full abstract»

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  • An analysis into the ability of expert systems to aid in legal reasoning

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    In an attempt to reduce some of the pressure in a overburdened legal system, an investigation into the feasibility of developing an expert system to aid in the field of business formation was performed. An expert system (Business Creation Advisor) was developed as a result of this research, and subsequently tested for accuracy, user-friendliness, and speed. Validation tests were conducted by exper... View full abstract»

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  • Power measurement in the presence of harmonic distortion

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Due to the rapid progress in power electronics, more and more energy is transmitted at nonsinusoidal voltage and current. However, the instrumentation controlling the flow of energy in such situations remains almost the same as is used for sinusoidal waveforms. The necessity of understanding these phenomena stems from the fact that they determine the efficiency of the power transmission and the po... View full abstract»

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  • Performance analysis of DQDB metropolitan subnetwork

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    An extensive performance analysis of the DQDB (distributed queue dual bus) metropolitan area network is presented. The performance is presented in terms of transfer delay, bandwidth allocation, per node and per network total delay, transient time, network size, and maximum local queue length. The effects of varying traffic intensity on the performance are examined. Simulation models for all MAC pr... View full abstract»

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  • Delamination detection scheme incorporating optical fiber sensors

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A scheme for the detection of a delamination within a composite panel using embedded optical fiber sensors is demonstrated. A composite panel was fabricated with optical fiber sensors embedded above and below a pregenerated delamination. Ultrasonic probing of the panel shows that the ultrasonic signal was not detected by the sensor beyond the delamination, indicating the location of the delaminati... View full abstract»

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  • Robust stabilization of `diamond' plants

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    For continuous-time systems the robust stability problem according to which coefficients of a characteristic polynomial vary in a diamond can be considered as a dual problem to Kharitonov's (1978, 1979) theorem on interval polynomials. The authors study the problem of the robust-stabilization of such a family of diamond polynomials. It is shown that to stabilize a family of polynomials whose coeff... View full abstract»

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  • Numerical solution of optimal control problems

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    A numerical method for solving optimal control problems is presented. The method consists of representing the solution of the optimal control problem by a Chebyshev polynomial, discretizing the problem using a cell averaging technique, thereby reducing the problem to a parameter optimization problem, applying the Lagrange multiplier method, and finally Newton's method. This method is efficient, ea... View full abstract»

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  • Macrocode for error detection and correction in mass memories

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    A new coding theory is established to detect and correct errors efficiently in mass memories. A novel error detection and correction code, macrocode, is presented. The macrocode features encoding a large amount of data into a separate code, and detecting as well as correcting multiple and symmetric errors in mass memories. The macrocode detectability and correctability of multiple and symmetric er... View full abstract»

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  • A new ANN model and factor analysis of its optimization parameters

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A model is presented in which the neuron plays a role in the learning phase through its adaptation of two parameters: the temperature and the level of connectivity of a given neuron. This method permits a neuron to adjust its own local temperature and the local activity of the connections. An extended back-propagation algorithm that includes both synaptical and neuronal parameters is applied to a ... View full abstract»

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  • A software requirements specification document model for the medical device industry

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A model of a requirements specification document for use by the medical device industry is discussed. This model combines the ANSI/IEEE and Fairley (1985) models and is designed to meet the regulatory requirements of the Food and Drug Administration. The model is not endorsed by the Food and Drug Administration nor proposed as the only model that could be used to meet the regulatory requirements. ... View full abstract»

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  • Localization of a mobile robot using a laser range finder in a hierarchical navigation system

    Publication Year: 1993
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors propose a hierarchical navigation system and the use of a line-scanning laser range finder for the localization of a mobile robot. For a mobile robot to navigate through an environment to a goal position the dead reckoning does not provide the accuracy of the position en-route, and the position needs be estimated through an external sensing mechanism. The localization of a mobile robot... View full abstract»

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  • Adaptive tracking control of a permanent magnet stepper motor driving a mechanical load

    Publication Year: 1993
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors present a nonlinear control development that can be used to design an adaptive tracking controller for a permanent magnet (PM) stepper motor driving a mechanical load. This development is based on modern but fundamental concepts quickly identified and understood by most in the control field. The proposed controller compensates for parametric uncertainty in the motor/load model while yi... View full abstract»

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  • Analysis and development of a process safety management system

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A methodology for implementing an electronic information management system was developed. The requirements of OSHA's regulation (29 CFR 1910.119) "Process Safety Management of Highly Hazardous Chemical, Explosives and Blasting Agents" were researched and summarized. A generic method for implementing a management system is suggested as a guide to be used by facilities complying with the regulation.... View full abstract»

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  • An approach to three-dimensional object recognition using a hybrid Hopfield network

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A neural network approach is presented as a solution to the three-dimensional object recognition problem. Specifically, a hybrid Hopfield network previously used to solve two-dimensional occluded object recognition problems is adapted to the three-dimensional object recognition problem. The authors proceed under the assumption that feature extraction has yielded a set of vertices for the model and... View full abstract»

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  • A study of power correction boost converter operating at CCM-DCM mode

    Publication Year: 1993
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    A power factor correction boost converter operating in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is analyzed. In principle, CCM-DCM mode is a special variable hysteresis control. It features the inductor current oscillated between a pure sinusoidal wave and zero. However, its design rules in engineering applications are similar to those of the constant on-time contro... View full abstract»

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  • Application of Fourier-Bessel transform for signal to noise improvement of speech signal

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The authors study the representation of the speech waveform using a basis set or kernel function derived from Bessel functions of the first kind. These functions have regular zero-crossings but decaying amplitudes that provide a better match to the behavior of speech waveforms. In addition to exploitation of such improved efficiency for storage and compression systems, the authors have shown the p... View full abstract»

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