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

26-28 March 1989

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  • Proceedings. The Twenty-First Southeastern Symposium on System Theory (Cat. No.89CH2714-4)

    Publication Year: 1989
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    Freely Available from IEEE
  • Effects of filtering on estimating spectral moments of meteorological Doppler spectra

    Publication Year: 1989, Page(s):204 - 208
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (340 KB)

    The authors describe the effort to develop a means of evaluating a clutter-rejection filter based on how it effects the pulse-pair processor spectral estimates of weather data in the absence of clutter. Several clutter-rejection filters are evaluated and compared with a baseline ideal filter. The loss of sensitivity, a measure of the signal power lost as a result of filtering, is also considered i... View full abstract»

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  • Packing of convex polygons in a rectangularly bounded, non-homogeneous space

    Publication Year: 1989, Page(s):200 - 203
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    A two-dimensional heuristic packing strategy, capable of achieving a dense packing of convex polygonal shapes, is presented. A method for extending the placement strategy to nonconvex n-gons is also presented. The algorithm was developed as part of a system to automate the various aspects of the hardwood manufacturing industry. The techniques developed, however, are applicable to the pack... View full abstract»

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  • Electromagnetic rail launcher force analysis

    Publication Year: 1989, Page(s):481 - 485
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (200 KB)

    A force prediction method, along with a dynamic simulation procedure, is presented for a specific launcher configuration. An equivalent circuit is developed to simulate railgun performance, and the electrical equations are given. The model used for mechanical performance is also presented. The simulation has been implemented in a Fortran computer code that has been debugged and verified on many ex... View full abstract»

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  • Pulse-pair spectral estimates in the presence of radar oscillator phase jitter

    Publication Year: 1989, Page(s):195 - 199
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    An approach to the investigation of the effect of phase jitter on spectrum moment estimation errors is discussed. The analysis is based on earlier published results that, in many cases, have been derived through a series of simplifying assumptions. The pulse-pair-/estimator variance expressions are derived using perturbation analysis under the assumption that perturbations are not excessive View full abstract»

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  • 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»

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  • Architectures for polynomial evaluation

    Publication Year: 1989, Page(s):190 - 194
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (208 KB)

    A regular architecture is proposed for the evaluation of polynomials of arbitrary degree. Control of the execution is accomplished with cube-type instruction. The time complexity is derived. The basic design is easily adapted to a pipeline structure. The study also shows that the constraint of regularity may make faster algorithms unsuitable for certain implementations View full abstract»

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  • Adaptive control of an orbiting single tether system

    Publication Year: 1989, Page(s):594 - 598
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (272 KB)

    The tethered satellite system (TSS) is a shuttle-based system that consists of a subsatellite connected by a single tether to a boom/reel mechanism located in the orbiter payload bay. A control law for the TSS, based on universal adaptive control (UAC) techniques, is developed. A nonlinear model of the TSS is formulated so that the linear controller can be evaluated, and comparison is made with re... View full abstract»

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  • An algorithm for reducing circuit equations in computer applications

    Publication Year: 1989, Page(s):104 - 108
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    Computer formulation of circuit equations using the modified nodal analysis is discussed. The modified nodal formulation gives rise to an unproportionately large number of circuit equations, even for small networks. An algorithm is presented to reduce these equations to a very small number, thereby reducing the memory requirement, as well as runtime, for the solution network responses. Though it i... View full abstract»

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  • 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»

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  • Fixed-depth interconnection networks

    Publication Year: 1989, Page(s):226 - 230
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    Interconnection networks that have D stages with K ×K switches, where D and K are powers of 2, are analyzed. The number of stages is held fixed irrespective of the number of processing elements in the system. These networks lie somewhere in the range between single-stage and multistage networks. The performance of these networks in terms of delay ... View full abstract»

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  • Optimal reduced order solution of the weakly coupled discrete Riccati equation

    Publication Year: 1989, Page(s):183 - 187
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (208 KB)

    The optimal solution of the weakly coupled algebraic discrete Riccati equation is obtained in terms of a reduced order continuous-type algebraic Riccati equation, using the bilinear transformation. The proposed method has a convergence rate O(ε2), where ε represents a small coupling parameter, and is applicable under quite mild assumptions. The method also reduces offline comp... View full abstract»

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  • Simulating the nonstationary behavior of communication networks

    Publication Year: 1989, Page(s):589 - 593
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    The problem of simulating communication networks under nonstationary conditions is considered. The critical issues in simulating the nonstationary behavior, such as determining appropriate performance measures, calculating confidence intervals, and selecting initial conditions, are discussed and approaches to their solutions are proposed. To illustrate some of the issues, results for the problem o... View full abstract»

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  • Computer simulation of compliant motion control for a robotic arm

    Publication Year: 1989, Page(s):98 - 103
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (260 KB)

    A hybrid position force control scheme was used to simulate the control of a two-degree-of-freedom robotic arm. The contact force between the end-effector and a surface was controlled while the end-effector moved parallel to the surface under position control. The end-effector was modeled as having passive compliance. Five simulations were performed using different levels of random noise in the fo... View full abstract»

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  • A digital simulation model for wind-diesel conversion scheme

    Publication Year: 1989, Page(s):160 - 166
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (308 KB)

    The development of a digital computer simulation on a nonlinear model of a unified wind-diesel interface scheme is presented. Wind energy is converted by a self-excited induction generator and interfaced to the diesel-driven synchronous generator by DC link fed by a current-source inverter. The nonlinear model is linearized around an operating point, and the derived linear models are utilized to d... View full abstract»

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  • Computer-aided diagnosis of epileptiform transients in EEG

    Publication Year: 1989, Page(s):404 - 409
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (364 KB)

    Methods are described for the detection of single-spike as well as spike and wave bursts activity, both of which are abnormal phenomena associated with epilepsy. The algorithms for detecting these transients were developed and tested using real electroencephalogram (EEG) data. The algorithms and their performance are described. The results of the single spike detection test clearly demonstrate the... View full abstract»

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  • 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»

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  • 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»

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  • Numerical simulations of current collection for the electrodynamic tether in space

    Publication Year: 1989, Page(s):376 - 379
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (244 KB)

    Numerical simulations have been carried out to determine the I -V characteristic of a long cylindrical body moving in a magnetized plasma. Results show that at relatively small body voltages, the collected current in the presence of magnetic field is insignificantly small compared with the situation without a magnetic field. However, when the body voltage increases, the current c... View full abstract»

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  • A comparison study of some impulse-response identification methods

    Publication Year: 1989, Page(s):52 - 56
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    Three methods for impulse-response identification are discussed and compared: the white noise input method, the correlation method with pseudorandom binary signal (PRBS) as input, and the fast Fourier transform (FFT) method. Digital simulation results are presented to indicate the advantages and shortcomings of each. The results show that for obtaining impulse-response estimates the PRBS method is... View full abstract»

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  • Computing network reliability of redundant MINs

    Publication Year: 1989, Page(s):221 - 225
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (264 KB)

    A reliability analysis technique for MINs (multistage interconnection networks) is discussed. The technique obtains a reliability expression in two steps. Step 1 enumerates paths that are responsible for maintaining one-to-one, one-to-many, or many-to-many connections in a MIN. Step 2 modifies the path information into an equivalent reliability expression. For both step methods techniques that are... View full abstract»

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  • A modular state variable approach to the electromagnetic transients problem

    Publication Year: 1989, Page(s):118 - 122
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    An efficient algorithm for investigating the electromagnetic traveling-wave phenomenon on an arbitrary power system is presented. Specifically, a modular state-variable approach is utilized to calculate the voltage and current traveling waveforms. Each component of the power system is modeled with its associated state variables. A method for decoupling these component equations is considered. A vo... View full abstract»

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  • Representing structurally adaptive systems with state variables and logic programs

    Publication Year: 1989, Page(s):178 - 182
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    It is suggested that a structurally adaptive system can be best represented using a state-variable model with state or output feedback and a validity vector that indicates the operability of sensors and actuators. Reconfiguration operators can be represented by logic programs. A brief survey of previous work in the nuclear industry on the representation of adaptive systems follows. The state-varia... View full abstract»

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  • The error probability for the BPSK/BPSK and OQPSK/BPSK spread spectrum communication systems in the presence of single tone jammer

    Publication Year: 1989, Page(s):584 - 588
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (320 KB)

    The error probability of BPSK/BPSK and OQPSK/BPSK direct-sequence spread-spectrum communication systems, in the presence of the single tone jammer, is developed using a simple technique. This technique clearly illustrates the same error probability for the OQPSK/BPSK and BPSK/BPSK systems. To measure the bit error probability, it is necessary to know the test statistics of the data, jammer, and no... View full abstract»

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  • 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»

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