[1989] Proceedings. The Twenty-First Southeastern Symposium on System Theory

26-28 March 1989

Filter Results

Displaying Results 1 - 25 of 134
  • Proceedings. The Twenty-First Southeastern Symposium on System Theory (Cat. No.89CH2714-4)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (131 KB)
    Freely Available from IEEE
  • Time domain analysis of linear networks using modified nodal formulation

    Publication Year: 1989, Page(s):608 - 612
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A method of obtaining the time-domain response of a linear network is given. In this method, the circuit equations are formulated using the simple modified nodal approach. The method requires the calculations of the initial conditions X(0+) for the variables of interest. A simple algorithm for finding the initial conditions from the circuit description is proposed, and the resu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • TEM wave propagation in a parallel, four wire anechoic chamber enclosure

    Publication Year: 1989, Page(s):476 - 480
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Propagation of a TEM wave in a four-wire anechoic chamber facility is considered. The electromagnetic fields of the four-wire system are given when anechoic chamber material is and is not present. The analysis of this problem is divided into two main parts: the first part analyzes how a TEM wire propagates in a four-wire system that is surrounded by four parallel metallic walls; and the second par... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An optical tracker for an orbiting tethered system

    Publication Year: 1989, Page(s):245 - 248
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The design of a tether tracker that provides real-time data for the position of a tether at its attachment point is examined. The optical and computational equipment that are used in the tether tracker design are described. The gating process and the algorithm used to perform the position determination are discussed. Simulation results show the tether tracker to be a feasible design. The gating pr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Partitioned-charge-based modeling: a new approach

    Publication Year: 1989, Page(s):452 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    By taking moments of the hole (electron) continuity equation, a novel derivation of the partitioned-charge-based (PCB) bipolar junction transistor (BJT) model is presented. The derivation allows for an arbitrary partitioning of the excess charge in the quasi-neutral base (QNB) and thus generalizes the PCB methodology. With this novel approach, an optimal nonquasi-static (NQS) BJT equivalent networ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multirate switched capacitors and comb filters

    Publication Year: 1989, Page(s):604 - 607
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A brief multirate Z-transform description of the periodically reverse switched capacitor is followed by the linking of comb filters to discretized analog first-order Butterworth filters. This makes it possible to generalize comb filters by discretizing higher order analog Butterworth filters. Moreover, the analog counterparts of these comb filters can also be determined; they are called p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multiple target detection through DFT processing in a sequential mode operation of real or synthetic arrays

    Publication Year: 1989, Page(s):264 - 267
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A multiple target detection technique based on the discrete processing of data collected in a sequential mode operation is presented. In this approach, the firing of the elements is sequential, with one or more elements receiving. The data are collected over all the existing (n1, n2) paths. An information sequence is computed by combining equiphase data. Aft... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • VLSI design of a quaternary carry ripple adder

    Publication Year: 1989, Page(s):470 - 474
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The design of a CMOS quaternary carry ripple adder is presented. The adder uses a single 5-V power supply. Layout and simulations for 4-, 8-, and 16-stage adders were done with MCNC (Microelectric Center of North Carolina) tools for VLSI design. The simulation results are compared with results for equivalent binary adders in terms of speed, chip area, power dissipation, number of transistors, and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Long-duration signal detection in a noisy environment

    Publication Year: 1989, Page(s):527 - 532
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A long-duration signal detector that can be used to alert a hearing-impaired person to the presence of the sound of a siren is developed. The design utilizes circuitry that allows the signal detector to discriminate between short-duration and long-duration signals. The combination of the effect of the long-duration `gating' and the bandpass filtering process on the input signal causes the circuit ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Discourse management in intelligent, multimodal user interfaces

    Publication Year: 1989, Page(s):662 - 665
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Recent advances in software and hardware are allowing researchers to implement user interfaces that are able to communicate with the user in multiple modes, such as text, video and audio. Many multimedia interfaces are knowledge based as well. With the richness of presentation modes available, the discourse manager must make many complex decisions to choose the appropriate mode or modes to be used... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A coherent optical correlator and matched filter maker

    Publication Year: 1989, Page(s):240 - 243
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Experimental work with a compact, coherent, real-time optical correlator and a matched-filter-maker system is described. Attributes of the correlator include small size, the ability to correlate an input image with multiple references, and operation over a wide range of input light levels. The input scene enters the correlator by a system of lenses while the matched filters are prerecorded on a ph... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Knowledge representation for reasoning about devices

    Publication Year: 1989, Page(s):446 - 449
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A novel knowledge-representation methodology that imposes syntactic structure and semantic discipline on the knowledge base is presented. The representation is based on the semantic network formalism and extends its organization principles to the semantics of the stored knowledge. Knowledge is classified according to subject and is organized into an inheritance hierarchy. Domain and reasoning know... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tension sensor for tethered satellites

    Publication Year: 1989, Page(s):300 - 304
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The design, construction, and testing of a tension sensor for sensing tension in a flexible tether connecting two orbiting satellites are presented. The analog sensor measures the tension profiles for deployment, retrieval, and disturbances of the tethered satellite system. The test results (linearity, bias, and drift) from the laboratory model indicate that the sensor is suitable for in-flight me... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Linear feedback control for a class of nonlinear systems

    Publication Year: 1989, Page(s):417 - 421
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors discuss a class of nonlinear vector systems that admit a Lyapunov function of the form V(x)=(x-α)Tρ(x -α). Examples of this class include Lorenz's system, the starting point for the modern study of systems with chaotic attractors, and Euler systems arising in the study of rotational motion of rigid and linked systems such a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • State-variable simulation of transients on transmission lines

    Publication Year: 1989, Page(s):600 - 602
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A time-domain simulation program is developed for use in the analysis of transmission lines in computer and data transmission systems. The program divides a transmission line into L-section segments and, using Kirchoff's voltage and current laws and the computed capacitance and inductance per unit length, simulates the traveling wave on the basis of state variable mode. The coefficients of the sys... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Accommodation of input-derivatives in linear adaptive control

    Publication Year: 1989, Page(s):626 - 628
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    It is shown how the author's theory (1984, 1988) of linear adaptive control can be generalized to accommodate plant models having input-derivative (numerator dynamics) terms. This generalization significantly extends the range of practical applications for linear adaptive control. Only the main ideas and procedures for modifying linear adaptive control theory to accommodate input-derivative terms ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Upper bound frequencies of two dimensional signals

    Publication Year: 1989, Page(s):258 - 263
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Two-dimensional (2-D) signals are considered, and expressions calculated for the uniform upper bound frequencies for certain classes of functions such that the contribution of frequencies higher than these bounds is less than some specified value given by the error criterion. Two classes of 2-D signals are considered: signals that can be expressed as a convolution of two functions, each of which i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time constrained operation of systolic arrays

    Publication Year: 1989, Page(s):465 - 469
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Partial results of a research project concerning the behaviour of systolic arrays as a function of the number of compute cycles are presented. The array is viewed as a device implementing families of transformations. The transformation implemented are parameterized by the compute cycle. It is shown that arrays designed for a generic algorithm representation may be efficient for special cases. Some... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Band-gap reference voltage source

    Publication Year: 1989, Page(s):541 - 544
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A simple bipolar monolithic reference voltage source is described. The design uses a bandgap cell as the reference for a series regulator to produce a voltage level that is tolerant of temperature, supply, and loading variations. The circuit consumes very little power and occupies minimal chip area. Laser trim provisions are included for on-chip adjustment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multivariable control design for a boiler furnace

    Publication Year: 1989, Page(s):93 - 97
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The robust linear quadratic Gaussian regulator design technique is applied to a model for a process boiler. The regulator design is used to balance the singular values of the plant plus integral controllers. The estimator design is used to recover the robustness properties of one node at another. The balancing of singular values tends to produce a decoupled response in the closed-loop system. Simu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A technique to stabilize the output voltage level of an emitter follower

    Publication Year: 1989, Page(s):524 - 526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The emitter follower configuration, which is usually driven by another amplifier stage, is discussed. Together, the preceding and emitter follower stages are modified to provide constant-output DC levels. A design method to stabilize these voltage levels is presented. Several practical circuits are illustrated. Typical results show the output DC voltage to have a temperature coefficient of only 0.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Unified canonical forms for linear time-varying dynamical systems under D-similarity transformations. I

    Publication Year: 1989, Page(s):74 - 81
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The notions of D-characteristic equations, essential D-eigenvalues, and S1 and D1 canonical forms for vector and scalar linear differential equation (VLDE and SLDE) operators are introduced. Using the notion of D-similarity, an important relation between the vector operator and the SLDE operator is established, and an explicit procedure for reducing a V... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Economic dispatch of electric power systems with line losses

    Publication Year: 1989, Page(s):13 - 17
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors present an overview of a method for calculating the economic generation dispatch using the power loss function and penalty factor for each plant. A generalized computer algorithm that uses an iterative solution of linearized cost functions to find the economic distribution of the power system generation is developed. The solution of the economic dispatch problem is based on Lagrangian ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Determining soil cover percentage by image segmentation

    Publication Year: 1989, Page(s):153 - 157
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Two image segmentation methods have been developed to determine the soil cover percentage. The first method uses color difference between soil and canopy, and the second method utilizes textural difference between soil and residue. These methods are shown to compare well with the photographic grid method. They were able to measure percentage soil cover quickly, accurately, and with little human er... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Heuristic metrics for AI problem domains such as natural language processing

    Publication Year: 1989, Page(s):658 - 661
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    It is proposed that a series of numeric metrics be established for the evaluation of problem domains such as natural-language processing. These metrics should be weighted averages of multiple independent factors and should be constructed so that typical human-level performance is taken to be unity. The usage of such metrics is discussed, and the example of natural language processing is detailed w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.