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Southeastcon '91., IEEE Proceedings of

7-10 April 1991

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Displaying Results 1 - 25 of 285
  • Coherent optical BPSK detection

    Publication Year: 1991
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (69 KB)

    Summary form only given. A coherent phase-locked synchronous oscillator (CPSO) was created by adding a feedforward and a feedback loop to the SO. An optically excited CPSO network was formed using a 4.3-GHz AVANTEK oscillator. Before the CPSO loop was formed, the oscillator was tuned near the subcarrier frequency with the DC bias in the loop filter. When the oscillator was tuned to within +/-3 MHz... View full abstract»

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  • IEEE Proceedings of SOUTHEASTCON '91 (Cat. No.91CH2998-3)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (89 KB)
    Freely Available from IEEE
  • Frame synchronization using complementary codes in digital communication systems

    Publication Year: 1991, Page(s):847 - 850 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Expressions are developed which can be used to determine the false-detection performance of complementary codes. The false-detection performance of complementary phase codes for various bit-error rates is presented and verified through simulation. It is shown that all complementary phase code pairs of the same length perform equally when preceded by random data. This shows that the performance of ... View full abstract»

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  • Performance analysis of complementary coded radar signals in an AWGN environment

    Publication Year: 1991, Page(s):842 - 846 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors investigate the performance of PN (pseudonoise) codes and complementary codes in an additive white Gaussian noise (AWGN) environment from a detection standpoint, and they provide a comparison of the performance of these two coding methods in a pulsed radar context. A general method of choosing a cost function is proposed to compare the two coding schemes. Simulation results are present... View full abstract»

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  • Integrating a database with real-time computing systems

    Publication Year: 1991, Page(s):837 - 841 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The authors present their experience in integrating a relational database manager with a real-time operating system kernel. Since a database system must operate in the context of available operating system services, an environment for database systems development must provide facilities to support operating system functions and integrate them with database systems for experimentation. The choice m... View full abstract»

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  • A generalized object oriented diagnostic model

    Publication Year: 1991, Page(s):755 - 758 vol.2
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    In order to reap the benefits of good software engineering practices throughout the NETHELP System Diagnostic Advisor, a model based on parallel classes combined with a technique for manipulating lists was developed. This model evolved from thinking about the diagnostic problem as a problem in mathematics. Developing `real-world' knowledge bases utilizing this model has resulted in knowledge bases... View full abstract»

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  • The design and fabrication of InxGa1-xAs Schottky barrier mixer diodes for space based heterodyne receivers

    Publication Year: 1991, Page(s):964 - 967 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The difficulty in obtaining substantial local oscillator (LO) power at very high frequencies places an upper limit on the frequency range of heterodyne receiver systems. LO power can be reduced by using two diodes in an antiparallel configuration, but this requires the diodes to have low turn-on voltages. The design of an InxGa 1-xAs Schottky barrier mixer diode with a turn-o... View full abstract»

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  • Hybrid intelligent perception system

    Publication Year: 1991, Page(s):832 - 836 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    A hybrid system capable of recognizing and learning two-dimensional patterns that can be used in imaging applications and robotic systems is described. The hybrid system comprises symbolic and neuromorphic modules which are complementary in character. The symbolic modules are efficient in handling precise objects but are susceptible to noise, whereas the neural networks are robust in the presence ... View full abstract»

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  • Determination of implanted electrode potential distributions in a man model

    Publication Year: 1991, Page(s):1130 - 1134 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The finite-element (FE) method has been used to analyze and determine the potential distribution produced by implanted stimulating electrodes used in conjunction with an implanted defibrillator. These electrodes are used to deliver an energy shock to halt ventricular fibrillation during fatal arrhythmias in human beings. The FE solution was obtained by solving the Laplace equation on the basis of ... View full abstract»

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  • Conversion of a rule based to an object oriented expert system

    Publication Year: 1991, Page(s):751 - 754 vol.2
    Cited by:  Papers (3)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The conversion of the NETHELP system from a rule-based system to an object-oriented system is described. Specifically, conversion was from the rule-based system written using Teknowledge's M.1 expert System Shell to the Object Oriented Nexpert Object Tool. The conversion progressed from a straightforward one-for-one conversion to a systematized use of the object and class mechanisms. The straightf... View full abstract»

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  • Considerations for selection and use of computers in the university engineering environment

    Publication Year: 1991, Page(s):948 - 952 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The authors report on the selection and use of several computer systems at Louisiana Tech University. They describe the purchase decision, installation, and subsequent use of a Sun network, an HP network, a PS/2 LAN (local area network), a Macintosh network, and a PC Novell network. Operating systems (DOS, Multifinder, and Unix) and software application programs are discussed View full abstract»

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  • Research at the George Mason University Technology Development Center for command, control, communications, and intelligence

    Publication Year: 1991, Page(s):827 - 831 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The George Mason University Technology Development Center was established in July 1989 for the purpose of conducting a broad-spectrum research and development program in command, control, communications, and intelligence (C3I). The program is being accomplished through the bringing together of a multidisciplinary group that concludes academic faculty, research staff, and industrial/gove... View full abstract»

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  • A pocket-size broadband electric field detection and storage device

    Publication Year: 1991, Page(s):1124 - 1129 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The radio-frequency (RF) dosimeter developed by the Oak Ridge National Laboratory is described. It is a portable, pocket-sized, cumulative-dose recording device designed to detect and record the strengths and durations of electric fields present in the work areas of naval vessels. The device measures an integrated dose and records the electric fields that exceed the permissible levels set by the A... View full abstract»

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  • Threshold net synthesis using simulated annealing

    Publication Year: 1991, Page(s):1069 - 1073 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The author describes the development of a novel threshold net synthesis algorithm that is based on decomposition by geometrical characteristics of threshold functions. A concept of center of gravity and its related theorems are discussed. A simulated annealing algorithm is adapted for the optimal decomposition of functions with many variables. The significance of the proposed method is not in the ... View full abstract»

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  • NETHELP user friendly interface

    Publication Year: 1991, Page(s):746 - 750 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The authors describe the interface for the NETHELP system, an advisory expert system used as an aid in diagnosing end user problems in the network control center at Federal Express. Extra effort has been expended in developing a user-friendly interface for the NETHELP diagnostic expert system so that acceptance will be enhanced. The features of this interface go beyond just support for the expert ... View full abstract»

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  • Utilization of special architectures in support of parallel discrete event simulation

    Publication Year: 1991, Page(s):822 - 826 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The authors describe a project which is intended as a prototype study to demonstrate the effectiveness, as measured by execution speedup, of running parallel simulations on newly available high-performance but relatively low-cost multiple-processor architectures. The authors focus on performance problems related to the use of discrete event simulation as a tool for development of system designs, a... View full abstract»

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  • Hurst's rescaled-range (R/S) analysis and fractal dimension of electromyographic (EMG) signal

    Publication Year: 1991, Page(s):1121 - 1123 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A microcomputer-based real-time signal acquisition system has been developed for online characterization of electromyographic (EMG) signals. A set of EMG signals is collected from three different patient groups: normal, neuropathic, and myopathic. The intramuscular signals are collected real-time for 2-3 s, during which the patient performs a continuous ramp contraction. The time-varying dynamic n... View full abstract»

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  • Measurement of thermal noise in condenser microphones and associated preamplifier in a vacuum-isolation vessel

    Publication Year: 1991, Page(s):520 - 524 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The electrical noise generated by thermal agitation of the air molecules impinging upon the membrane of a condenser microphone and from its associated preamplifier has been studied analytically and experimentally over a wide bandwidth. These background noise levels constitute one of the most important specifications of a microphone, for they determine the lowest sound pressure than can be detected... View full abstract»

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  • Architecture and design of a real-time parallel processor

    Publication Year: 1991, Page(s):891 - 895 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors present a novel architecture and its design for a real-time parallel array processor for high-speed digital signal processing applications. The processor generates sequential output data from a stream of input data and a set of predetermined coefficients. The processor has been designed and functionally simulated by the VHSIC Hardware Description Language. The processor includes a pipe... View full abstract»

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  • Relationships among sets, relations, lattices, and Boolean algebra

    Publication Year: 1991, Page(s):1065 - 1068 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    Conventionally, Boolean algebra is introduced by means of the postulate-oriented approach. In the present work, the set-theory-oriented approach is developed. It is shown that the relationships among sets, relations, lattices, and Boolean algebra form a distributed but not complemented lattice. Illustrative examples are shown with Hasse diagrams. The results may have applications to chromosome cla... View full abstract»

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  • A parallel approach in switchbox routing

    Publication Year: 1991, Page(s):1184 - 1188 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    A parallel algorithm, called PARALLEX, has been developed for the switchbox routing problem. The algorithm can be easily implemented on a shared-memory multiprocessor system. Since the algorithm is general-purpose in nature, it can be applied to a variety of routing problems. The number of processes is equal to the number of nets; each process has its own net to be routed. All the nets routed by i... View full abstract»

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  • A controller based on the energy function to improve convergence of a neural network

    Publication Year: 1991, Page(s):741 - 745 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The feedback (Hopfield) model of a neural network is enhanced by the addition of a controller. This controller selectively chooses responses in the feedback loop to improve the performance of the recall operation. The process of selection is based on finding the response with the lowest (deepest) energy at each step of iteration. Results of computer simulations are presented. The recall improvemen... View full abstract»

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  • A new galvanometric scanner for rapid tuning of CO2 lasers

    Publication Year: 1991, Page(s):1255 - 1256 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A device for rapidly tuning both CW (continuous-wave) and TEA (transversely excited atmospheric) CO2 lasers is presented. This galvanometer-driven unit is of considerable importance over that previously reported in that it can attain at least 200 Hz tuning without the need for additional equipment or algorithms. Tuning a TEA laser at repetition rates of 200 Hz has been demonstrated for ... View full abstract»

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  • CO gas detection utilizing Pd-SnOx MIS heterostructure

    Publication Year: 1991, Page(s):819 - 821 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The triangular voltage sweep method was used to study the device characteristics of Pd-SnOx MIS heterostructure for detection of CO gas. An increase in area under the current peak in the J p-V plot and a shift of current peak toward more positive gate bias voltages were found with increasing CO gas concentration in an O2 or Ar environment. Results... View full abstract»

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  • Traffic controls for secured communications systems

    Publication Year: 1991, Page(s):664 - 668 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Definition of SCS (secured communications systems) requirements is examined, and implementation to a conceptual hardware and software design approach to the traffic control and ranging (TCR) circuits is described. The traffic control functions of the SCS optimize the bandwidth of the plain-text data bus with no degradation of performance. The ideal location for the traffic control function is at t... View full abstract»

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