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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： R.C. Meitzler A.G. Andreou K. Strohbehn R.E. Jenkins Department of Electrical and Computer Engineering Johns Hopkins University Baltimore MD USA Johns Hopkins University-Applied Physics Laboratory Laurel MD USA

An analog CMOS VLSI prototype for a visual motion detector was fabricated and tested. This 1-D implementation computes image displacement from a fixed reference point and is suitable for eventual inclusion in an image... 详细信息

关键词： Detectors Biology computing Motion detection Delay Optical computing Humans Analog computers Biological system modeling Power system modeling Biological systems

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An associative memory integrated system for character recognition

An associative memory integrated system for character recogn...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： P.O. Pouliquen A.G. Andreou K. Strohbehn R.E. Jenkins Department of Electrical and Computer Engineering Johns Hopkins University Baltimore MD USA Applied Physics Laboratory Johns Hopkins University Laurel MD USA

An associative memory chip is used for fast, robust character recognition. Operating in parallel, the chip determines the closest match between an input bit pattern and multiple stored bit patterns based on the Hamming distance; ties are broken arbitrarily. The chip is programmable for bit-mapped fonts of up to 124 bits per character and can store up to 116 characters. A fully functional 6.8 mm by 6.9 mm chip has been fabricated in a standard single-poly, double-metal 2.0 /spl mu/m n-well CMOS process.< >

关键词： Associative memory Character recognition Biology computing Silicon Neural networks computer interfaces Humans Biological systems Very large scale integration Independent component analysis

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Automated inspection planning within the Rapid Design System

Automated inspection planning within the Rapid Design System

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IEEE International Conference on Systems engineering

作者： Merat Radack Roumina Ruegsegger Department of Electrical Engineering and Applied Physics Center of Automation and Intelligent Systems Research Case Western Reserve University USA Department of Computer Engineering and Science Center of Automation and Intelligent Systems Research Case Western Reserve University USA

A methodology for automated inspection planning of machined parts within feature-based CIM in which part geometry and tolerances are represented as features is described. This representation of information as features is extended to inspection process planning where inspection plan fragments are inspection features containing specific information about how toleranced geometry is to be inspected. A rule base of methods and detailed procedures for evaluating tolerances based on industrial practices are used to generate the inspection plan fragments. A single tolerance can often be inspected in several ways, resulting in the generation of many inspection plan fragments. Inspection planing for computer-controlled coordinate measuring machines is emphasized. The inspection plan fragments for each tolerance in the design are combined into an overall time-efficient inspection plan. An algorithm for inspection process planning is described and applied to a sample part.< >

关键词： CADCAM Inspection Knowledge based systems Machining Industrial control Manufacturing data processing Artificial intelligence

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Positioning features within the Rapid Design System

Positioning features within the Rapid Design System

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IEEE International Conference on Systems engineering

作者： Radack Jacobsohn Merat Department of Computer Engineering and Science Center of Automation and Intelligent Systems Research Case Western Reserve University Cleveland OH USA Department of Electrical Engineering and Applied Physics Center of Automation and Intelligent Systems Research Case Western Reserve University Cleveland OH USA

A method for representing and manipulating information on dimensioning and positioning within a feature-based environment for mechanical parts design is described. In the feature-based design paradigm, designs are constructed using form features which are high-level representations of part geometry, i.e. block, hole, slot, pocket, chamfer, fillet, etc. In the system discussed two modes of positioning form features are supported. The first is a layout mode, which allows the user to position form features relative to each other, in order to layout the general geometry of the part. The second is a dimensioning mode, in which the user specifies which dimensions on the part are critically important, and what they should be. The system completes the dimensioning on request, producing enough dimensions to generate an engineering drawing.< >

关键词： Design automation Computational geometry engineering drawings

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An approach to the direct analysis of transient stability

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European Transactions on electrical Power 1993年第3期3卷 241-248页

作者： Djukanovic, M.B. Sobajic, D.J. Pao, Y.‐H. Miodrag B. Djukanovic (1959) received his B.S. M.Sc. and Ph.D. degrees in Electrical Engineering from the University of Belgrade/Yugoslavia in 1982 1985 and 1992 respectively specializing in electric power systems. In 1984 he joined the Electrical Engineering Institute “Nikola Tesla” in Belgrade where he was working on the scientific studies in the field of power systems planning operation and control. In 1985 and 1990 he was appointed as a research scholar at the Royal Institute of Technology Stockholm and Case Western Reserve University Cleveland Ohio. His major in- terests are in the area of power system analysis steady-state and dynamic security and application of neural networks in electric power systems. (Electrical Engineering Institute “Nicola Tesla” ul. Koste Glavinica 8A YU-11000 Belgrad T +3811/2351-619 Fax + 3811/2351-823) Dejan J. Sobajic (1949) received the B.S.E.E. and the M.S.E.E. degrees from the University of Belgrade/Yugoslavia in 1972 and 1976 respectively and the Ph.D. degree from Case Western Reserve University Cleveland Ohio in 1988. At present he is with the Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland. He is also the Engineering Manager of A1 WARE Inc. Cleveland. His current research interests include power system operation and control neuralnet systems and adaptive control. He is a member of the IEEE Task Force on Neural-Network Applications in Power Systems and of the IEEE Intelligent Controls Committee. He is the Chairman of the International Neural-Networks Society Special Interest Group on Power Engineering. (Case Western Reserve University Department of Electrial Engineering and Computer Sciences Glennan Building Ohio 44 106 USA T + 1216/421-2380 Fax +1216/368-8776) Yoh-Han Pao (1922) has been a Professor of Electrical Engineering and Computer Science at Case Westem Reserve University (CWRU) Cleveland Ohio since 1967. He has served as chairman of the University's Electrical Engineering Department

The Transient Energy Function (TEF) method has been intensely investigated over the last decade as a reliable and accurate tool for transient stability assessment of multimachine power systems. In this paper we propose the Potential Energy Boundary Surface (PEBS) based method for direct analysis of transient stability. The critical value of transient energy and the Critical Clearing Time (T_CCT) are evaluated without the need for successive calculation and memorization of the system kinetic and potential energy values along the sustained fault trajectory. The method is used for determination of output features in the training phase of the neural‐net based transient security assessment. The proposed approach is tested on the well‐known ten‐generator New England test system demonstrating the validity and accuracy of obtained results. Copyright © 1993 John Wiley & Sons, Ltd.

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ASTIGMATICALLY COMPENSATED, HIGH-GAIN COOPERATIVE UP-CONVERSION LASER

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applied physics LETTERS 1992年第25期60卷 3084-3086页

作者： XIE, P RAND, SC Division of Applied Physics Department of Electrical Engineering and Computer Science University of Michigan 1301 Beal Avenue Ann Arbor Michigan 48109‐2122

We demonstrate a cw Er:LiYF4 trio laser in a 3-mirror cavity configuration, and investigate details of the mechanism yielding stimulated upconversion well above liquid nitrogen temperatures with an efficiency of 20%.

关键词： SOLID STATE LASERS CW LASERS FREQUENCY CONVERTERS ERBIUM IONS EFFICIENCY TEMPERATURE EFFECTS TEMPERATURE RANGE 0065?0273 K OPTICAL PUMPING POPULATION INVERSION

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2-BEAM COUPLING BY NITROGEN-VACANCY CENTERS IN DIAMOND

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OPTICS LETTERS 1992年第3期17卷 175-177页

作者： REDMAN, D SHU, Q LENEF, A RAND, SC Division of Applied Physics Department of Electrical Engineering and Computer Science 1301 Beal Avenue University of Michigan Ann Arbor Michigan 48109-2122

A new method for two-beam coupling measurements based on acousto-optic modulation with subhertz tuning capability is applied to study excited-state dynamics of the nitrogen-vacancy center in diamond. Results yield fundamental decay constants and the nonlinear refractive index and are in good agreement with the calculated dual grating response to resonances in the microscopic susceptibility due to intersystem crossing and spin-lattice relaxation.

关键词： Diamond Hole burning Modulation Nitrogen vacancy centers Phase modulation Refractive index

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Submillimeter-wave endfire slotline antennas

Submillimeter-wave endfire slotline antennas

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1992 Joint Symposia Digest: IEEE Antennas and Propagation Society International Symposium, AP-S 1992

作者： Gearhart, Steven Ekström, Hans Acharya, Pranay Kollberg, Eric Jacobsson, Stellan Rebeiz, Gabriel Department of Applied Electron Physics Chalmers University of Technology Gothenburg Sweden NASA Center for Space Terahertz Technology Electrical Engineering and Computer Science Department University of Michigan Ann ArborMI United States

ISBN: (纸本)0780307305

Endfire slotline antennas have been integrated on a 1.75μm thick dielectric substrate. The thin substrate allows the upper frequency limit of the slotline antennas to be pushed beyond ITHz. Antennas have been fabricated and tested at 350 and 802GHz. The patterns exhibit high directivity (15+/-ldB) and wide bandwidth. In the future, these antennas will be combined with SIS junctions for low noise astronomical receivers. © 1992 IEEE.

关键词： Submillimeter waves

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Correlation between the complex conductivity and the transmission coefficient of high Tc superconducting films of thickness smaller than the penetration depth

Correlation between the complex conductivity and the transmi...

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1992 Asia-Pacific Microwave Conference, APMC 1992

作者： Ceremuga, J. Langley, B. Department of Electrical and Computer Engineering James Cook University TownsvilleQLD4811 Australia Department of Applied Physics Stanford University StanfordCA94305 United States Hewlett Packard 3500 Deer Creek Rd Palo AltoCA94304 United States

ISBN: (纸本)0780305493

Correlation between signals transmitted through high Tc superconducting thin films complex conductivity has Derivation of the equation the been discussed. describing the transmission coefficient through films of thickness smaller than penetration depth (dλ) , has been given. Verification of the equation has been done for YBCO films. © 1992 IEEE. .

关键词： Superconducting films

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Least squares methods for H∞ control-oriented system identification

Least squares methods for H∞ control-oriented system identi...

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American Control Conference (ACC)

作者： A. J. Helmicki C. A. Jacobson C. N. Nett Department of Electrical and Computer Engineering University of Cincinnati Cincinnati OH USA Department of Electrical and Computer Engineering Northeastern University Boston MA USA Georgia Institute of Technology School of Applied and Engineering Physics Atlanta GA USA

This paper presents a series of system identification algorithms that yield identified models which are compatible with current robust controller design methodologies. These algorithm are applicable to a broad class of stable, distributed, linear, shift-invariant plants. The a priori information necessary for their application consists of a lower bound on the relative stability of the unknown plant, an upper bound on a certain gain associated with the unknown plant, and an upper bound on the noise level. The a posteriori data information consists of a finite number of noisy point frequency response estimates of the unknown plant. The specific contributions of this paper are to examine the extent to which certain standard Hilbert space or least squares methods are applicable to the H ∞ system identification problem considered. Results are established that connect the H 2 error of the least square methods to the H ∞ error needed for control-oriented system identification. In addition, the notion of a posteriori error bounds is introduced and used to establish sequentially optimal or adaptive algorithms based on these filbert space approaches.

关键词： Least squares methods System identification Upper bound Error correction Robust control Design methodology Stability Noise level Frequency response Frequency estimation

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