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Proceedings of the 27th IEEE Conference on Decision and Control

7-9 Dec. 1988

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  • Proceedings of the 27th IEEE Conference on Decision and Control (IEEE Cat. No.88CH2531-2)

    Publication Year: 1988
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  • Robustness of time-delay systems: a survey

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    Summary form only given. A survey was made of recent results on robustness of time-delay systems in the parameter-space framework. Robust stability, robust stabilization, and bounds on H-infinity norm were the main topics considered. It has been demonstrated on a counterexample that Kharitonov's theorem on the stability of interval polynomials is not extendable to polynomials in s and exp (-hs).<<... View full abstract»

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  • Analog neural systems

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (46 KB)

    Summary form only given. The author describes work in understanding the limitations of analog computing systems and their relevance to several problems involving neural networks. Two main themes are considered, both involving computational complexity considerations. The first theme involves the proposal that neural networks be used to solve the 'intractable' (NP-complete) combinatorial optimizatio... View full abstract»

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  • Communication issues in parallel and distributed optimization algorithms

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (23 KB)

    Summary form only given, as follows. Massive speedups through parallel optimization methods will not likely be achieved without efficient communication between processors. Three related issues are discussed: optimization algorithms that can take advantage of special communication-efficient hardware such as processor arrays; optimal routing algorithms for linear algebra calculations in message-pass... View full abstract»

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  • Some communication complexity issues in asynchronous algorithms

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (44 KB)

    Summary form only given. The author has studied an asynchronous version of the Bellman-Ford algorithm for computing the shortest distances from all nodes in a network to a fixed destination. It is known that this algorithm has (in the worst case) exponential (in the size of the underlying graph) communication complexity. The author has obtained results indicating that its expected (in a probabilis... View full abstract»

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  • Distributed load balancing

    Publication Year: 1988
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    Summary form only given. The authors solve a load balancing problem for parallel processors, given limited state information. The novelty of the problem is that the routing units at the parallel arrival streams of tasks have different and limited state information. This makes the problem a team problem of a distributed control problem. The engineering model for this problem consists of arrival str... View full abstract»

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  • Robustness of flexible structures against small time delays

    Publication Year: 1988, Page(s):1647 - 1648 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The authors give transfer matrices for some models described by partial differential equations. From these transfer matrices the poles and zeros are easily derived. The effect of a small time delay in the feedback loop is considered, and it is shown that if the feedthrough in the loop is too strong, this will give instability. The transfer matrices have the advantage that the amount of feedthrough... View full abstract»

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  • A new approach to robust adaptive control in the presence of unknown and bounded disturbances

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (79 KB)

    Summary form only given. An adaptive l/sup 1/ controller has been based on the certainty-equivalence approach where at each step the system parameters are estimated and used to implement the controller. At each estimation stage a modeling error is committed which affects the output of the estimated plant. The l/sup 1/ optimal controller has been constructed to minimize the effect of this error on ... View full abstract»

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  • On the foundations of system identification

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (27 KB)

    Summary form only given. One philosophically coherent position is to view system (or process) identification as the search for a theory (or model) in a given class that minimizes a (loss) function of (1) the cumulative prediction errors incurred using a particular model and (2) a measure of the complexity of the model (such as the McMillan degree of a linear predictor). The resulting identificatio... View full abstract»

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  • On the role of renewal theory in the analysis of a class of cyclic hybrid-state stochastic systems

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    Summary form only given. The author reviews a class of cyclic hybrid-state stochastic processes arising in the modeling of thermostat-controlled electric power system loads, and particularly important in load management applications. He shows that there are two distinct viewpoints for analyzing the statistical properties of these processes: an internal viewpoint and an external one. The internal v... View full abstract»

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  • A geometric isomorphism with applications to closed loop controls

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    Summary form only given. In this work feedback equivalence of n-state, (n-1)-control systems satisfying certain regularity conditions divides such systems into two invariant classes. The author shows that class 1 corresponds, via a geometric isomorphism, to classical Lagrangian variational problems. He proves the existence of time-critical closed-loop controls for systems which satisfy the nondege... View full abstract»

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  • System radii of semi-discretized hereditary control systems

    Publication Year: 1988, Page(s):2003 - 2005 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The authors consider several problems concerning the robustness of finite-dimensional models constructed by semi-discretization of certain infinite-dimensional distributed-parameter systems. The term `robustness' is used to refer to the preservation of various system properties under perturbations and not to the robustness of a particular control design. Examples are presented to illustrate the ba... View full abstract»

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  • Control of service rate for an M/G/1 queue using a short-term cost criterion

    Publication Year: 1988, Page(s):1108 - 1113 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A short-term cost criterion is introduced to model the productivity of an M/G/1 queuing/production system; the cost is a weighted sum of penalties associated with the work rate control, penalties associated with part waiting time, and penalties on the increase of parts in the queue, assessed during the time required to serve a single part. The distribution of the service time is of general form, p... View full abstract»

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  • Applications of plant inversion via state feedback to missile autopilot design

    Publication Year: 1988, Page(s):730 - 735 vol.1
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A linearizing transformation technique developed for the control of nonlinear systems is applied to the autopilot design of air-to-air missile systems. The plant inversion characteristic of this methodology is clearly displayed, and stability problems associated with nonminimum-phase plants are identified. To avoid the difficulty associated with the non-minimum-phase dynamics of missile accelerati... View full abstract»

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  • A scalar H explicit adaptive controller

    Publication Year: 1988, Page(s):1362 - 1365 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    An H self-tuning control scheme is presented. A generalized cost function is utilized which allows dynamic costing of the systems and control signals. The H-optimal solution to this problem is shown to reduce to the solution of a pair of a relatively simple polynomial equations. A solution method for these equations is presented which is parti... View full abstract»

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  • Applications and analysis of second order artificial neural networks

    Publication Year: 1988, Page(s):348 - 349 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The authors investigate a two-layer artificial neural network which consists of one hidden layer of second-order neurons and an output layer of first-order neurons. The second-order neurons yield conic-surface types of decision regions such as ellipses and parabolas. A simulation example is presented. It is shown that such networks yield more flexibility than first-order networks. An analysis of t... View full abstract»

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  • Synthesis of H controllers based on conjugation

    Publication Year: 1988, Page(s):7 - 13 vol.1
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The authors consider the state-space characterization of the model-matching problem in H. A simple characterization of the solutions is derived in the most general form, which covers the four-block problem, based on the notion of J-lossless conjugation. The derivation is elementary, simple, and straightforward, and it demonstrates that conjugation is a powerful ... View full abstract»

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  • Approximation of the algebraic Riccati operator equation

    Publication Year: 1988, Page(s):2001 - 2002 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    The authors consider an infinite-dimensional linear quadratic control problem in Hilbert space. An approximation of the solution of the algebraic Riccati operator equation is examined. A convergence result for the approximating Riccati operators is obtained View full abstract»

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  • Spaceplanes astronaut's associate control server

    Publication Year: 1988, Page(s):149 - 154 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The author addresses the extension of the DARPA/US Air Force Pilot's Associate program to the astronaut's associate application, and particularly the control server aspect. Some representative techniques for implementing this system are discussed. Artificial intelligence (AI) and neural networks are applied synergistically to achieve an optimum system. The author examines such issues as adaptive a... View full abstract»

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  • Optimal scheduling of two competing queues with blocking

    Publication Year: 1988, Page(s):1102 - 1107 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Consideration is given to the problem of optimal scheduling for two queues competing for service at a single station, where the queues have finite capacities and the service rate is class-dependent. The cost structure is linear in the number of holding customers in the queues, combined with blocking costs incurred whenever arrivals encounter a full queue. It is shown that the optimal policy minimi... View full abstract»

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  • Strong robustness in uncertain multivariable systems

    Publication Year: 1988, Page(s):2157 - 2164 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A review is presented of the basis of the Horowitz quantitative feedback theory (QFT). It is shown that the basic assumptions of (QFT) have mathematical justification. However, necessary and sufficient conditions for the solvability of the QFT problem are presently not known. By reposing the QFT problem as an M-matrix design problem, it is possible to develop the desired existence conditi... View full abstract»

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  • Controller synthesis for infinite dimensional systems based on a passivity approach

    Publication Year: 1988, Page(s):724 - 729 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The author discusses a generalization of hyperstability to systems in Hilbert space and its application to finite-dimensional stabilizing compensator design. The basic idea is to characterize tolerable perturbations in terms of the passivity of the nominal closed-loop system. Controllers achieving the required closed-loop passivity property can then be designed using H-o... View full abstract»

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  • On the computation of the gap metric

    Publication Year: 1988, Page(s):1360 - 1361 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The author considers the gap metric introduced by G. Zames and A.K. El-Sakkary (1980). He derives an expression for the gap metric that is computable using well-known techniques from interpolation theory. The author also derives an alternate proof that the graph and the gap matrices are equivalent. This gives rise to upper and lower bounds for the graph metric, which is difficult to evaluate exact... View full abstract»

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  • Applications of neural networks to medical signal processing

    Publication Year: 1988, Page(s):343 - 347 vol.1
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The authors describe two applications of NN (neural networks) that are intended to provide an illustration of some of the capabilities of NN-based medical signal processing. The first concerns the decomposition of surface (transcutaneous) EMG (electromyography) into its inaccessible motor unit action potentials (MUAP) for the purpose of determining the sequence of single (or groups) of MUAP which ... View full abstract»

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  • Voltage instability proximity index (VIPI) based on multiple load flow solutions in ill-conditioned power systems

    Publication Year: 1988, Page(s):2114 - 2119 vol.3
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The authors deal with an index for predicting voltage instability, based on the relationship between voltage instability and multiple-load flow solutions. After comparison of several indices for two scenarios, the effectiveness of the VIPI (voltage instability proximity index) is shown. This index is computed from multiple-load-flow solutions and can be used for monitoring the system state View full abstract»

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