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Custom Integrated Circuits Conference (CICC)

作者： T.M. Kelessoglu D.O. Pederson Dept. of Electr. Eng. & Comput. Sci. California Univ. Berkeley CA USA Department of Electrical Engineering and Computer Sciences Electronics Research Laboratory University of California Berkeley CA USA

An environment for SPICE called NECTAR has been developed which overcomes convergence and user-interface problems with SPICE by simulating the actions taken by an expert. NECTAR recognizes patterns which cause nonconvergence and provides ways to sidestep the problem. It identifies errors in the SPICE input file and automatically corrects them. It can be used as a circuit-design aid and improves the user interface for SPICE simulations. NECTAR derives its power from knowledge acquired from expert SPICE users and circuit designers.< >

关键词： SPICE Convergence Human computer interaction Circuit simulation Circuit synthesis User interfaces Pattern recognition Error correction Application specific integrated circuits Engines

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Balanced realizations of singularly perturbed systems

Balanced realizations of singularly perturbed systems

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IEEE Conference on Decision and Control

作者： S.M. Shahruz S. Behtash Department of Electrical Engineering and Computer Sciences and the Electronics Research Laboratory University of California Berkeley CA USA Dept. of Electr. Eng. & Comput. Sci. California Univ. Berkeley CA USA

Balanced realizations of linear time-invariant singularly perturbed systems are studied. A reduced model of a singularly perturbed system based on the balanced realization is obtained. An approximate balancing transformation for singularly perturbed systems is constructed based on the balancing transformations of the approximating slow and fast subsystems.< >

关键词： Controllability Observability Reduced order systems Eigenvalues and eigenfunctions Laboratories Control system synthesis Control systems Linear systems Bismuth

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L/sup 1/ sensitivity minimization for plants with commensurate delays

L/sup 1/ sensitivity minimization for plants with commensura...

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IEEE Conference on Decision and Control

作者： M.A. Dahleh Y. Olhta Laboratory of Information and Decision Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Dept. of Electr. Eng. & Comput. Sci. MIT Cambridge MA USA

A solution is presented to the L/sup 1/ minimization problem for plants with commensurate delays. In the special case where the weight has one pole, the problem can be solved by a single linear programming problem. Other special cases are also presented. A method for computing the optimal performance and a characterization of minimizing solutions are given.< >

关键词： Polynomials Atomic measurements Optimized production technology Delay systems Control systems Optimal control Algebra Laplace equations H infinity control

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Towards increased image fidelity in microwave diffraction tomography

Towards increased image fidelity in microwave diffraction to...

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Antennas and Propagation Society International Symposium

作者： B.D. James W.-M. Boerner Comnunications Laboratory Department of Electrical Engineering h Computer Science University of Illinois Chicago Chicago IL USA Dept. of Electr. Eng. & Comput. Sci. Illinois Univ. Chicago IL USA

The authors develop, implement, and test efficient computer methods for reconstructing the permittivity profile of a diffraction limited tomographic imaging system. The methods are designed to correct for weak diffraction and depolarization effects in electromagnetic imaging. Increased media penetration using diffraction methods compensates for the inherent loss of image resolution, as compared with projection tomographic methods. The primary goal is to gain further knowledge about vector inverse scattering in inhomogeneous media and its computational feasibility.< >

关键词： Electromagnetic diffraction Tomography Microwave imaging System testing Image reconstruction Permittivity Design methodology Image resolution Inverse problems Nonhomogeneous media

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Approaches on multi-sensor fusion under time-evolving conditions

Approaches on multi-sensor fusion under time-evolving condit...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： R.C. Luo W.S. Yang M.-H. Lin Robotics and Intelligent Systems Laboratory Electrical and Computer Engineering Department North Carolina State University Raleigh NC USA Dept. of Electr. & Comput. Eng. North Carolina State Univ. Raleigh NC USA

A paradigm for optimum estimation of fused multiple sensor data is developed in order to best use the sensor information in the time evolving environment. Two basic approaches have been developed: dynamic moving quadratic curve fitting and weighted least mean square error. These two approaches are shown to be advantageous in terms of accuracy, speed, and versatility. The theoretical frameworks presented are supported by sets of simulation data.< >

关键词： Sensor fusion Robot sensing systems Intelligent robots Intelligent sensors Sensor systems Uncertainty Military aircraft Machine intelligence Mobile robots Sensor phenomena and characterization

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Decentralized adaptive control (robot)

Decentralized adaptive control (robot)

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IEEE International Conference on Robotics and Automation (ICRA)

作者： B.J. Oh M. Jamshidi H. Seraji CAD Laboratory for Systems/Robotics Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA Dept. of Electr. & Comput. Eng. New Mexico Univ. Albuquerque NM USA Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA

A decentralized adaptive control is proposed to stabilize and track the nonlinear interconnected subsystems with unknown parameters. The adaptation of the controller gain is derived by using model reference adaptive control theory based on Lyapunov's direct method. The adaptive gains consist of sigma , proportional, and integral combination of the measured and reference values of the corresponding subsystem. The proposed control is applied to the joint control of a two-link robot manipulator, and the performance in computer simulation corresponds with what is expected in theoretical development.< >

关键词： Adaptive control Control systems Programmable control Laboratories Manipulators Robot sensing systems Nonlinear control systems Couplings Robust control Propulsion

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Circuit aging simulator (CAS)

Circuit aging simulator (CAS)

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International Electron Devices Meeting (IEDM)

作者： P.M. Lee M.M. Kuo K. Seki P.K. Lo C. Hu Department of Electrical Engineering and Computer Sciences University of California Berkeley Berkeley CA USA Central Research Laboratory Hitachi and Limited Tokyo Japan Dept. of Electr. Eng. & Comput. Sci. California Univ. Berkeley CA USA

A circuit aging simulator (CAS) has been developed as part of the BSIM (Berkeley Short-channel Igfet Model) family to predict the effects of hot-electron degradation on MOS circuit behavior. Using the SPICE2 of SPICE 3 circuit simulator in a UNIX environment, CAS simulates circuit behavior at a user-specified future time using fresh and DC prestressed BSIM parameter process files. CAS is configured in a pre- and postprocessor configuration, so that no modifications to the SPICE code are necessary. Iterative simulation to take into account ongoing degradation can also be done through an accompanying UNIX shell scrip program.< >

关键词： Aging Circuit simulation Content addressable storage Degradation Predictive models Voltage Computational modeling Artificial intelligence computer simulation Tiles

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Rapid Thermal Nitridation of Thin Oxides

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MRS Online Proceedings Library 1987年第1期92卷 121-125页

作者： D. K. Shih S. K. Lee Y. H. Ku D. L. Kwong S. Lee Dept. of Electrical Engineering and Computer Engineering The University of Texas at Austin Microelectronics Research Center Austin USA NCR Corporation Colorado Springs USA

In this paper the kinetics of initial nitridation of thermal oxides is studied by using rapid thermal nitridation of thin oxides. FTIR and AES were used to investigate the chemical properties of nitrided oxide films. The amount of the nitrogenincorporated in and the oxygen escaped from 100Å oxides has been characterized quantitatively as a function of RTN conditions. Results show that RTN at 1100° for 120s incorporates about 85% and 12% of the maximum nitrogen concentration value at oxide surface and bulk, respectively. The nitrogen pile up peak at interface can be seen after RTN at 1100°C with the time as short as 5 s. Study of the effects of the nitridation temperature and the original oxide film thickness indicates that the reaction species has permeated through oxides before effective replacement reaction takes place. The diffusion coefficient of the permeating species is estimated of the value larger than 40−13cm2/s.

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Applications of Polysilicon Films in Microsensors and Microactuators

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MRS Online Proceedings Library 1987年第1期106卷 213-224页

作者： Roger T. Howe Berkeley Sensor & Actuator Center Dept. of Electrical Engineering and Computer Sciences and the Electronics Research Laboratory University of California Berkeley USA

This paper reviews the applications of polysilicon in microsensor technology and in the emerging field of microfabricated actuators. Polysilicon is an attractive material for thin-film strain gauges, and is also used to fabricate micromechanical structures. The need for better understanding of the non-electrical properties of polysilicon, such as Young’s modulus, residual strain, ultimate strength, friction, and wear, is emphasized.

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A Frequency-Domain Estimator for Use in Adaptive Control Systems

A Frequency-Domain Estimator for Use in Adaptive Control Sys...

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American Control Conference (ACC)

作者： Richard O. LaMaire Lena Valavani Michael Athans Gunter Stein Department of Electrical Engineering and Computer Science Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA Department of Aeronautics and Astronautics Massachusetts Institute of Technology Cambridge MA USA Laboratory for Information and Decision Systems Dept. of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 Honeywell Systems and Research Center Minneapolis MN 55418

The paper presents a frequency-domain estimator which can identify both a nominal model of a plant as well as a frequency-domain bounding function on the modeling error associated with this nominal model. This estimator, which we call a robust estimator, can be used in conjunction with a robust control-law redesign algorithm to form a robust adaptive controller.

关键词： Frequency estimation Adaptive control Robust control Programmable control Control systems Bandwidth Robustness Robust stability Paper technology Space technology

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