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检索条件"机构=Systems Science PhD Program Portland State University"

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Controller Design via Adaptive Critic and Model Reference Methods

Controller Design via Adaptive Critic and Model Reference Me...

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International Joint Conference on Neural Networks 2003

作者： Lendaris, G.George Santiago, Roberta McCarthy, Jay Carroll, Michael Systems Science Ph.D. Program Electrical and Computer Engineering Portland State University Portland OR 97201 United States Systems Science Ph.D. Program Portland State University Portland OR 97201 United States Electrical Engineering Department Portland State University Portland OR 97201 United States Computational Neuroscience University of Chicago Chicago IL United States

Dynamic programming (DP) is a principled way to design optimal controllers for certain classes of nonlinear systems;unfortunately, DP is computationally very expensive. The Reinforcement Learning methods known as Adaptive Critics (AC) provide computationally feasible means for performing approximate Dynamic programming (ADP). The term 'adaptive ' in A C refers to the critic 's improved estimations of the Value Function used by DP. To apply DP, the user must craft a Utility function that embodies all the problem-specific design specifications/criteria. Model Reference Adaptive Control methods have been successfully used in the control community to effect on-line redesign of a controller in response to variations in plant parameters, with the idea that the resulting closed loop system dynamics will mimic those of a Reference Model. The work reported here 1) uses a reference model in ADP as the key information input to the Utility function, and 2) uses ADP off-line to design the desired controller. Future work will extend this to on-line application. This method is demonstrated for a hypersonic shaped airplane called LoFL YTE®;its handling characteristics are natively a little "hotter" than a pilot would desire. A control augmentation subsystem is designed using ADP to make the plane "feel like " a better behaved one, as specified by a Reference Model. The number of inputs to the successfully designed controller are among the largest seen in the literature to date.

关键词： Adaptive control systems

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Accelerating Critic Learning in Approximate Dynamic programming Via Value Templates and Perceptual Learning

Accelerating Critic Learning in Approximate Dynamic Programm...

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International Joint Conference on Neural Networks 2003

作者： Shannon, Thaddeus T. Santiago, Roberto A. Lendaris, George G. NW Compl. Intelligence Laboratory Systems Science Ph.D. Program Portland State University Portland OR United States

The concept of value templates and perceptual learning are introduced as refinements to the reinforcement learning (RL) paradigm. We demonstrate a method for accelerating Dual Heuristic programming (DHP) critic training using value templates and perceptual learning. Both faster and more stable learning are achieved by using the value template and utilizing its inherent constraints to regularize the perceptual learning task. The method is demonstrated by tuning a neurofuzzy control system for a highly nonlinear 2nd order plant proposed by Sanner and Slotine. We take advantage of the TSK model framework throughout to keep the controller, critic, and model components used in DHP highly interpretable.

关键词： Learning systems

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Process monitoring via independent components

Process monitoring via independent components

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System Security and Assurance

作者： Shannon, Thaddeus T. Abercrombie, David McNames, James Systems Science Program Portland State University Portland OR United States LSI Logic Gresham OR United States Elec. and Comp. Eng. Department Portland State University Portland OR United States

We propose a method for process monitoring of a semiconductor manufacturing process. Independent Component Analysis (ICA) is applied to characterize E-test parameter data. We calculate angular confidence intervals for the model, eliminate marginally significant components and implement control charts for significant components of interest. Alarms are generated off of deviations in the charted components. Alarms are easily used in process diagnosis based on the interpretation of the independent components.

关键词： Statistical process control

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Artificial neural network implementation using many-valued quantum computing

Artificial neural network implementation using many-valued q...

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International Joint Conference on Neural Networks (IJCNN)

作者： A.N. Al-Rabadi G.G. Lendaris Portland State Univ. OR USA Systems Science Ph.D. Program at Portland State University USA

Neural network (NN) implementation using the general scheme of many-valued (MV) quantum computing (QC) is presented in this paper. The proposed method uses the many-valued orthonormal computational basis states to implement such computations. Physical implementation of NNQC is performed by controlling the potential to yield specific wavefunction as a result of solving Shrodinger's equation that governs the dynamics of QC.

关键词： Quantum computing Artificial neural networks Computer networks Neural networks Quantum entanglement Quantum mechanics Schrodinger equation Grid computing Physics computing Logic gates

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Process monitoring via independent components

Process monitoring via independent components

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IEEE International Conference on systems, Man and Cybernetics

作者： T.T. Shannon D. Abercrombie J. McNames Systems Science Program Portland State University Portland OR USA LSI Logic Inc. Gresham OR USA Electrical and Computer Engineering Department Portland State University Portland OR USA

We propose a method for process monitoring of a semiconductor manufacturing process. Independent component analysis (ICA) is applied to characterize E-test parameter data. We calculate angular confidence intervals for the model, eliminate marginally significant components and implement control charts for significant components of interest. Alarms are generated off of deviations in the charted components. Alarms are easily used in process diagnosis based on the interpretation of the independent components.

关键词： Independent component analysis Manufacturing processes Process control Computerized monitoring Semiconductor device manufacture Production Circuit testing Random variables Mutual information Principal component analysis

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Semiconductor manufacturing process visualization

Semiconductor manufacturing process visualization

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IEEE International Conference on systems, Man and Cybernetics

作者： J. McNames D. Abercrombie D. Turner T. Shannon IC Design &Test Laboratory Portland State University Portland OR USA LSI Logic Inc. Gresham OR USA Systems Science Program Portland State University Portland OR USA

This paper describes a new graphical display of semiconductor manufacturing processes. The display shows the tool usage at each step and the frequency of transitions between adjacent steps using a normalized nonlinear color map. We use normalized entropy and conditional entropy to quantify how close the tool usage and transition frequencies are to an ideal uniform mixing process. The display also shows the steps for which a fraction of the data was lost. Throughout the display we used color to emphasize different process conditions: red represents alarm conditions and is designed to draw attention; white represents normal, expected conditions; and blue represents lower than normal usage. We designed the display to convey useful information and help process engineers visualize large data sets. This enables fast identification of violations in the assumptions of typical statistical process control techniques and data integrity problems.

关键词： Visualization Displays Manufacturing processes Integrated circuit testing Frequency Data engineering Design engineering Monitoring Logic testing Large scale integration

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Modeling intracranial fluid flows and volumes during traumatic brain injury to better understand pressure dynamics

Modeling intracranial fluid flows and volumes during traumat...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： W. Wakeland J. McNames M. Aboy D. Hollemon B. Goldstein Systems Science Ph.D. Program Portland State University Portland OR USA Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA Complex Systems Laboratory Division of Pediatric Critical Care Oregon Health and Sciences University Portland OR USA

We describe a computer model of intracranial pressure (ICP) dynamics that evaluates clinical treatment options for elevated ICP during traumatic brain injury (TBI). The model uses fluid volumes as primary state variables and explicitly models fluid flows as well as the resistance, compliance, and pressure associated with each intra- and extracranial compartment (arteries and arterioles, capillary bed, veins, venous sinus, ventricles, and brain parenchyma). The model evaluates clinical events and therapies such as intraand extra-parenchymal hemorrhage, cerebral edema, cerebrospinal fluid drainage, mannitol administration, head elevation, and mild hyperventilation. The model is able to replicate observed clinical behavior in many cases, including elevated ICP associated with severe cerebral edema following subdural, epidural, or intraparenchymal hematoma. The model also mimics cerebrovascular regulatory mechanisms that are activated during TBI.

关键词： Brain modeling Brain injuries Fluid dynamics Blood Logic Laboratories Fluid flow Medical treatment Signal processing Cranial pressure

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Significance of intracranial pressure pulse morphology in pediatric traumatc brain injury

Significance of intracranial pressure pulse morphology in pe...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames D. Cuesta-Frau W. Wakeland T. Thong S. Lai B. Goldstein Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA Computer Vision Group ETS-Alcoi Polytechnic University of Valencia Spain Systems Science Ph.D. Program Portland State University Portland OR USA Biomedical Engineering OGI School of Science and Engineering Oregon Health and Sciences University Portland OR USA Complex Systems Laboratory Department of Pediatrics Oregon Health and Sciences University Portland OR USA

We investigated the relationship between the intracranial pulse pressure (ICP/sub PP/) and the mean intracranial pressure (ICP/sub M/). In adult patients, several research groups have described a linear relationship between ICP/sub PP/ and ICP/sub M/ within the range of cerebral autoregulation. Current monitoring and therapy are mainly based on the mean ICP/sub M/, since it is believed that the ICP/sub M/ contains most of the information provided by the other pulse morphology metrics. In this paper we attempt to answer whether there is further information within the ICP morphology not explained by ICP/sub M/ that might be of prognostic significance. We screened ICP records of 42 patients admitted to the Pediatric Intensive Care Unit at Doernbecher Children's Hospital for segments in which the ICP/sub M/ varied at least 5 mmHg during a 1-hour period. We found 54 segments in 9 different pediatric TBI patients (ages 0.2-17.8 years, mean=9.9 years). ICP/sub PP/ and ICP/sub M/ were calculated for each pulse using an automatic pressure detection algorithm. The coefficient of linear correlation r was > 0.70 in 43/54 segments (p < 0.001), which indicates that there exists a linear relationship between ICP/sub PP/ and ICP/sub M/. However, we found r > 0.90 only in 16/54 segments (p=NS) . This result and visual inspection of ICP/sub PP/ vs. ICP/sub M/ density plots suggest that ICP pulse pressure is not fully explained by the ICP M.

关键词： Cranial pressure Morphology Brain injuries Iterative closest point algorithm Pediatrics Patient monitoring Medical treatment Hospitals Detection algorithms Inspection

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Proposed framework for applying adaptive critics in real-time realm

Proposed framework for applying adaptive critics in real-tim...

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International Joint Conference on Neural Networks (IJCNN)

作者： G.G. Lendaris R.A. Santiago M.S. Carroll Systems Science and of Electrical & Computer Engineering Northwest Computational Intelligence Laboratory Portland State University Portland OR USA Systems Science Program Northwest Computational Intelligence Laboratory Portland State University Portland OR USA

Adaptive critics have shown much promise for designing optimal nonlinear controllers in an off-line context. Still, their greatest potential exists in the context Of reconfigurable control, that is, real time controller redesign in response to (substantial) changes in plant dynamics. To accomplish this, a framework is proposed for the application of adaptive critics in real-time control (for those critic methods requiring a model of the plant). The framework is presented in the context of work being done in reconfigurable flight control by the NW Computational Intelligence Lab (NWCIL) at portland state university. The proposal incorporates recent work (by others) in fast and efficient on-line plant identification, considerations for bounding the computational costs of converging neural networks, and a novel approach (by us) toward the task of assuring system stability during the adaptation process. The potential and limitations of the proposed framework are discussed. It is suggested that with the recent rapid reduction in computational barriers, only certain theoretical issues remain as the central barriers to successful on-line application of the methods.

关键词： programmable control Adaptive control Optimal control Neural networks Computational intelligence Control systems Stability state-space methods Design methodology Piecewise linear approximation

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Altruism, the prisoner's dilemma, and the components of selection

Altruism, the prisoner's dilemma, and the components of sele...

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2001 IEEE International Conference on systems, Man and Cybernetics

作者： Fletcher, Jeffrey A. Zwick, Martin Systems Science Ph.D. Program Portland State University Portland OR 97207-0751 United States

The n-player prisoner's dilemma (PD) is a useful model of multilevel selection for altruistic traits. It highlights the non zero-sum interactions necessary for the evolution of altruism as well as the tension between individual and group-level selection. The parameters of the n-player PD can be directly related to the Price equation as well as to a useful alternative selection decomposition. Finally, the n-player PD emphasizes the expected equilibrium condition of mutual defection in the absence of higher levels of organization and selection.

关键词： Game theory

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