| Data-Driven Robust Control Design: Unfalsified Control |
01 DEC 2006 |
19 pages |
| Authors:
Michael G. Safonov; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
 | Aerospace applications require precise control despite uncertain operating conditions and unanticipated circumstances such as battle damage. These systems must be designed to perform robustly, despite uncertain design models and difficult to analyze nonlinear effects. They must be capable of learning and adapting when accumulating data indicates that previous models must be abandoned and that existing control strategies must be changed. Data-driven design methods, collectively known as un-falsified control theory, facilitate ... |
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| Receiver Sites for Accurate Indoor Position Location Systems |
01 JAN 2005 |
5 pages |
| Authors:
Z. Ebrahimian; R. A. Scholtz; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| Hyperbolic radio-location systems possess intrinsic uncertainty that depends on the sensor's geometry and the modulation's time resolution. In this paper the best locations for the receivers to minimize the uncertainty in 2-dimensional (2-D) and 3-dimensional (3-D) models for indoor systems are found. For this purpose the minimum number of receivers with clear line-of-sight (LOS) to the emitter, required for locating a source, are three and four in 2-D and 3-D ... |
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| Robust Control, Feedback and Learning: Data-Driven Methods |
31 JUL 2004 |
6 pages |
| Authors:
Michael G. Safonov; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The research effort supported under this grant ended 31 July 2004. A highlight of progress during the final fiscal year was a clear theoretical explanation of and solution to. the model mismatch stability problem generally associated with state-of-the-art adaptive control design methods. The source of these model-mismatch instability problems was traced to the implicit use of absolute-error cost functions and/or use of assumption-driven cost functions. These cost-functions were shown via ... |
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| Area, and Power Performance Analysis of a Floating-Point Based Application on FPGAs |
24 SEP 2003 |
35 pages |
| Authors:
Gokul Govindu; Ling Zhuo; Seonil Choi; Padma Gundala; Viktor K. Prasanna; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| Almost all signal processing algorithms are initially represented as double precision floating-point in languages such as Matlab. For hardware implementations, these algorithms have to be converted to large precision fixed- point to have a sufficiently large dynamic range. However the inevitable quantization effects and the complexity of converting the floating-point algorithm into a fixed point one, limit the use of fixed-point arithmetic for high precision embedded computing. FPGAs have become ... |
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| An Integrated Design Environment to Evaluate Power/Performance Tradeoffs for Sensor Network Applications |
21 MAY 2003 |
5 pages |
| Authors:
Amol B. Bakshi; Jingzhao Ou; Viktor K. Prasanna; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| Networks of inexpensive, low-power sensing nodes that can monitor the environment, perform limited processing on the samples, and detect events of interest in a collaborative fashion are fast becoming a reality. Examples of such monitoring and detection include target tracking based on acoustic signatures and line -of-bearing estimation, climate control, intrusion detection, etc. The advances in low-power radio technology are making wireless communication within sensor networks an attractive option. However, ... |
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| Data-Driven Robust Control Design: Unfalsified Control |
MAY 2003 |
18 pages |
| Authors:
Michael G. Safonov; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| Feedback control systems for aerospace applications must maintain precise control despite uncertain operating conditions and unanticipated circumstances such as battle damage. These systems must be designed to perform robustly, despite uncertain design models and difficult to analyze nonlinear effects. They must also be capable of learning and adapting when accumulating data indicates that previous models must be abandoned and that existing control strategies must be changed. We present recent developments ... |
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| Ultrawideband Radio Ranging Studies |
10 FEB 2003 |
45 pages |
| Authors:
Robert A. Scholtz; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The research grant supported the study of UWB radio ranging advantages and issues caused primarily by the wide radio frequency bandwidth and fine time resolution capabilities of these systems. Significant progress was made in understanding how to cooperatively range in a dense multipath environment. In addition, UWB propagation measurements were made in a shipboard environment to determine the difficulties in positioning using RF signals in a large metallic enclosure, and ... |
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| Robust Control Feedback and Learning |
30 NOV 2002 |
25 pages |
| Authors:
Michael G. Safonov; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The research focused on broadening the class of solvable robust control problems and on developing a firm information theoretic foundation for incorporating the real-time effects of evolving experimental data. Robust control theory concerns the design of control systems capable of robustly maintaining performance to within prescribed tolerances in the face of large- but-bounded modeling uncertainties and nonlinearities. Significant advances were achieved in nonlinear robustness analysis for systems having repeated monotone ... |
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| Unconventional Laser Guide Stars and Wavefront Correction of Blue Starlight |
28 MAY 2002 |
10 pages |
| Authors:
Robert W. Hellwarth; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| In this project we established by theory and experiment (1) that a 1/ 4 Joule, 20 ns, ultraviolet laser pulse could create (near 20 km altitude) a return signal to the transmitting telescope that would appear, for 20 ns, to have a brightness temperature of millions of degrees, and thus serve as a guide star for high-order corrections of blue starlight, (2) that a much lower energy (approx. one hundred ... |
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| Theoretical Support Program for Plasma-Based Concepts for Future High Energy Accelerators. IEEE Transactions on Plasma Science: A Publication of the IEEE Nuclear and Plasma Sciences Society, Volume 28, Number 4, August 2000 |
AUG 2000 |
262 pages |
| Authors:
Thomas C. Katsouleas; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The purpose of this grant was to support a workshop entitled "International Workshop on 2nd Generation Plasma Accelerators". The attached proceedings of that meeting have now been published as a Special Issue of IEEE Transactions on Plasma Science (August 2000, Volume 28, Number 4) These proceedings serve as a summary of the workshop and hence an appropriate summary report of the results of the grant. |
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| BLIND BEAMFORMING FOR ACOUSTIC AND SEISMIC SENSORS, |
MAR 1999 |
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| Authors:
K. YAO; R. E. HUDSON; C. W. REED; D. Chen; F. LORENZELLI; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
 | (U) THIS PAPER BRIEFLY REVIEWS THE SIGNAL PROCESSING ARCHITECTURE OF A WIRELESS MICRO-ELECTRO-MECHANICAL (MEM) SENSOR SYSTEM FOR SOURCE DETECTION, SIGNAL ENHANCEMENT, LOCALIZATION, AND IDENTIFICATION. A BLIND BEAMFORMER USING ONLY THE MEASURED DATA OF RANDOMLY DISTRIBUTED SENSORS TO FORM A SAMPLE CORRELATION MATRIX IS PROPOSED. THE MAXIMUM POWER COLLECTION CRITERION IS USED TO OBTAIN ARRAY WEIGHTS FROM THE DOMINANT EIGENVECTOR OF THE SAMPLE CORRELATION MATRIX. AN EFFECTIVE BLIND BEAMFORMING ESTIMATION OF ... |
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| Instrumentation Facility for the Evaluation, Testing, and Packaging of Polymer Materials and Devices for Integrated Optical Circuits and Photonic Systems |
31 DEC 1998 |
7 pages |
| Authors:
William Steier; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This report describes the instrumentation facilities now available for the evaluation of new polymer materials for photonics and the measurement of polymer photonic devices. This new instrumentation was purchased and constructed using the funds from this DURIP Grant. The new facilities include attenuated total reflection and ellipsometric instrumentation for the measurement of electro-optic coefficients. Instrumentation for the measurement of thin film waveguide loss and material index of refraction by spectroscopic ... |
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| Robust Control Methods |
31 OCT 1998 |
18 pages |
| Authors:
Michael G. Safonov; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This is the final report for research supported under AFOSR Grant F49620-95-1-0095 during the period December 15, 1994 through August 31, 1998. The research focused broadening class of solvable robust control problems and on developing a firm information theoretic foundation for incorporating the real- time effects of evolving experimental data in adaptive robust control system designs. Robust control concerns the problem of engineering control systems capable of robustly maintaining performance ... |
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| Multidisciplinary Research on Advanced, High-Speed, Adaptive Signal Processing for Radar Sensors |
APR 97 |
154 pages |
| Authors:
Irving Reed; Chrysostomos L. Nikias; Viktor K. Prasanna; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This report addresses two major components of research for high speed, spacetime adaptive processing (STAP) for radar sensors, namely (1) the development of advanced algorithms for detection and parameter estimation of weak targets in the presence of jamming and clutter, and (2) the mapping of the algorithms onto massively parallel computing architectures for high speed implementation. First, advances in detection and estimation for STAP applications are achieved using joint Gaussian ... |
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| Photonic Technology Development for Densely Interconnected Neural Networks: Augmentation Award |
24 JAN 97 |
4 pages |
| Authors:
B. K. Jenkins; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Technical accomplishments under the grant, 'Photonic Technology Development for Densely Interconnected Neural Networks: Augmentation Award' (AFOSR Grant No. F49620-93-1-0445), B. K. Jenkins, P.I. are described. They include an analysis of convergence conditions and properties of backward error propagation learning in photorefractive based optical neural networks. The analysis includes implementations based on fully coherent single source architectures and on incoherent/coherent multiple source architectures. Also analyzed in terms of their effect on ... |
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| OEIC Transmitters Employing Ultra Low Threshold Three Terminal Lasers |
MAY 96 |
139 pages |
| Authors:
P. D. Dapkus; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| A program of research to investigate the integration of optoelectronic and electronic devices for transmitters is described. The report describes research aimed at developing low threshold laser for using in these transmitters and describes three different types of lasers: a folded cavity surface emitting laser, an ultralow threshold intracavity contacted vertical cavity laser structure and an ultralow threshold, electrically isolated vertical cavity laser structure employing oxide semiconductor Bragg mirrors. In ... |
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| Robust Control Methods |
15 JAN 95 |
15 pages |
| Authors:
Michael G. Safonov; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This is the final report for research supported under AFOSR Grant F49620-92-J-0014 during the period November 1, 1991 through January 15, 1995. During this period research effort was broadly focused on developing the theory of extending class of solvable robust control problems and on developing a theory to accommodate the issues that arise in going from experimental data to robust control designs. Robust control concerns the problem of engineering control ... |
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| Competition Between Electromagnetic Modes in a Free-Electron Maser |
28 FEB 94 |
90 pages |
| Authors:
Alan H. McCurdy; V. Kasibhotla; R. Liou; J. S. Plewa; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| A three part report is presented describing the mode competition in a gyrotron oscillator with two competing electromagnetic modes. Part I gives the theory of this mode coupling is presented using a quasi-linear assumption which is valid for small power levels. The results are interpreted in terms of the phase plane. These general results are applied to a specific case of mode competition, that between TE101 and TE011 modes in ... |
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| Modeling and Control of Nonlinear Systems |
10 JAN 94 |
5 pages |
| Authors:
John E. Hauser; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| We have conducted research on the modeling and control of nonlinear systems. Our efforts have been directed toward understanding the control of truly nonlinear behavior as well as the synthesis of control laws for systems that can be nearly transformed into linear systems (via approximate feedback linearization). We have introduced a new framework for understanding and analyzing the stability and control of nonlinear maneuvering systems. This approach is based on ... |
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| Investigation of Heterojunctions and Multiple Quantum Well Structures Using Crystalline Organic Semiconductors |
12 OCT 93 |
104 pages |
| Authors:
Stephen R. Forrest; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| A new class of engineered materials based on crystalline organic semiconductors grown by the ultrahigh vacuum process of organic molecular beam deposition is described. The objective of this program is to investigate these materials and the conditions which lead to ordered growth between highly lattice mismatched van der Waals crystals into novel 'quasi-epitaxial' structures. During the first year of the program, considerable progress has been made in understanding and exploiting ... |
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| Estimation Using Subjective Knowledge with Tracking Applications. |
JUL 1993 |
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| Authors:
R. Popoli; J. Mendel; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Within the framework of classical estimation theory, there is no technically legitimate ways to utilize knowledge that cannot be codified by either deterministic or strict probability models. We introduce a theoretically defensible approach (coordinated objective/subjective estimation (COSE) for the simultaneous incorporation of both objective and subjective knowledge in estimation. Also discussed is a technique (heuristically constrained estimation (HCE) which is a particular interpretation of the Bayesian use of subjective priors. ... |
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| Epitaxial Liftoff Technology onto Processed Silicon Foundry Wafers |
93 |
2 pages |
| Authors:
Eli Yablonovitch; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| Technical Objectives: Research the application of liftoff transfer of epitaxial material to foreign substrates including: surface chemistry, electrical, mechanical, thermal and optical properties of Van der Waals bonded materials; III-V devices bonded to silicon circuitry and to other substrates with enhanced optical, electrical or thermal properties; integrated optical devices incorporating lifted-off material and/or devices with LiNbO$ sub 3$, glass or other substrates. Approach: This effort addresses the need for new ... |
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| Second-Harmonic Generation in Optical Fibers and Glass |
30 SEP 92 |
34 pages |
| Authors:
Vincent G. Dominic; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This is the final report for the JSEP fellowship awarded to Vincent G. Dominic. We report on our investigation into the unusual and unexpected effect of second-harmonic generation in optical fibers and optical fiber preforms. We make three important conclusions: Experimental investigations into this effect are simpler and more controllable if carried out in bulk glass samples (optical fiber preforms) rather than in the optical fibers themselves. The induced second-order ... |
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| Stability and Adaptation of Neural Networks |
23 SEP 92 |
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| Authors:
Bart Kosko; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| This research studied the stability, adaptation, and robustness of neural networks and fuzzy systems. Key results include the stability of random adaptive bidirectional associative memories (RABAMs) and neural-fuzzy competitive and differential-Hebbian ABAMs, the introduction and analysis and testing of the differential competitive learning law, new theorems on the stochastic convergence of competitive learning for vector quantization, a universal approximation theorem for fuzzy systems, unsupervised schemes for Teaming fuzzy rules with ... |
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| Photorefractive Properties and Alternating Electric Field Gain Enhancement of Vanadium-Doped Cadmium Telluride and Related Compounds, |
22 MAY 1992 |
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| Authors:
Mehrdad Ziari; William H. Steier; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Recent studies of the photorefractive response of cadmium tellurides have demonstrated it to be a highly sensitive material with a broad near infrared sensitivity extending to beyond 1.5 microns. Desirable parameters, such as large electrooptic coefficient, small dielectric constant, large carrier mobility and availability in semi-insulating form, makes CdTe a potential material of choice for many applications. This study focuses on photorefractive characterization of Bridgeman grown crystals with the goal ... |
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| Signal Location Using Generalized Linear Constraints |
JAN 92 |
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| Authors:
Lloyd J. Griffiths; D. D. Feldman; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| This report has presented a two-part method for estimating the directions of arrival of uncorrelated narrowband sources when there are arbitrary phase errors and angle independent gain errors. The signal steering vectors are estimated in the first part of the method; in the second part, the arrival directions are estimated. It should be noted that the second part of the method can be tailored to incorporate additional information about the ... |
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| Mathematical Methods of Communication Signal Design |
30 SEP 90 |
|
| Authors:
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Basic Research in Reliability for Real Systems |
30 SEP 90 |
|
| Authors:
Victor O. Li; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The goal of our research is to develop practical models and efficient algorithms to analyze the reliability/availability/maintainability of complex systems in which component failures are statistically dependent and each component is subject to degradations before complete failure. The Cause-Based Multimode Model (CBMM) was developed. Practical and computationally tractable solution methods were designed. In addition, an ordered enumeration approach was developed to solve the network survivability enhancement problem. Preliminary computational experiments ... |
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| Mode Selection by Priming in an Over moded Electron Cyclotron Master |
24 SEP 90 |
|
| Authors:
Alan H. McCurdy; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| It has been found that an externally injected signal can strongly influence the steady-state electromagnetic mode in which a pulsed electron cyclotron maser (ECM) operates. A careful experimental examination reveals that the process by which this occurs is similar to the oscillator phase priming noted previously in magnetron work. It is found here that the degree of mode control depends on the injected signal power level (relative to the ECM ... |
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| Investigation of the Optical and Electronic Properties of Crystalline Organic Materials |
14 JUN 90 |
281 pages |
| Authors:
Stephen R. Forrest; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| We have done extensive investigations of the optical and electronic properties of heterojunctions containing crystalline organic semiconductors. Using the new, ultrahigh vacuum process of organic molecular beam deposition (OMBD), we have grown heterojunctions consisting of organic semiconductors in contact with other organic semiconductors, as well as with inorganic semiconductors. Multiple quantum well structures consisting of two dissimilar organic semiconductors have been grown for the first time, and these structures show ... |
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| Discrete Mathematics for Communication Systems |
31 MAR 90 |
|
| Authors:
Solomon W. Golomb; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Contents: Tuscan-K Squares; Bounds for Arrays of Dots with Distinct Slopes or Distinct Differences; Algebraic Constructions for Frequency Hop Patterns; Constructions for Perfect Maps and Pseudo-Random Arrays; On Hamiltonian Decomposition of Kn*, Patterns with Distinct Differences, and Tuscan Squares; Florentine Rows or Left-Right Shifted Permutation Matrices with Cross Correlation Values < or - 1; Fragments of Symmetry in Circular Rows; The Ungracefulness of an Extended Pentagon for a Problem Posed ... |
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| Workshop on Higher-Order Spectral Analysis Held at Vail, Colorado on 28- 30 June 1989 |
28 NOV 89 |
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| Authors:
C. L. Nikias; Jerry M. Mendel; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| About 123 attendees from the United States, France, United Kingdom, Italy, Japan, and Israel participated in the Workshop on Higher-Order Spectral Analysis. Held in Vail, Colorado, the three day event turned out to be very successful in terms of participation and quality of contributions. The objective of the workshop was to provide a forum for discussion of new theories and methods for processing signals that are based on Higher-Order Spectra. ... |
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| Practical Methods for Robust Multivariable Control |
12 OCT 89 |
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| Authors:
Michael G. Safonov; Edmond A. Jonckheere; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The design of supermaneuverable fighter aircraft, high-precision space-born optical tracking systems and transatmospheric hypervelocity vehicles will pose significant challenges to modern control system design theory. The theme of the research has been making modern control theory work. The product of the research has been theory, algorithms and software applicable to multivariable feedback control problems in which there are design constraints requiring robust attainment of stability and control performance objectives in ... |
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| Basic Research in Reliability for Real Systems |
01 SEP 89 |
|
| Authors:
Victor O. Li; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The goal of our research is to develop practical models and efficient algorithms to analyze and evaluate the reliability/availability/maintainability of complex systems in which component failures are statistically dependent and each component is subject to degradations before complete failure. We have developed the Event-Based Reliability Model (EBRM) for the reliability modeling and analysis of real systems in which component failures are statistically dependent. Most existing reliability models assume that system ... |
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| Adaptive Multiple-Band CFAR (Constant-False-Alarm-Rate) Detection of an Optical Pattern with Unknown Spectral Distribution |
JUN 89 |
|
| Authors:
Robert Gagliardi; Irving S. Reed; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| A generalized constant false-alarm rate (CFAR) algorithm is developed for detecting the presence of an optical signal of non-zero intensity in J signal-plus-noise bands or channels. For many applications this new algorithm is more flexible and practical than previous ones. If J=1, the resulting test reduces to the standard normalized matched filter test for finding a signal in clutter of unknown and varying intensity. Both theoretical and computer simulation results ... |
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| The Algebraic Structure of Convolutional Codes |
31 OCT 88 |
|
| Authors:
Irving S. Reed; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| A new code search technique for high-rate convolutional code is developed using the pruned-trellis algorithm. The search time and memory size is significantly reduced from standard techniques. Some new high-rate systematic and nonsystematic optimum convolutional codes have been found by this new search technique. The real advantage of the pruned error-trellis, syndrome decoding technique is the reduction of the memory size required with little performance |
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| Center for the Integration of Optical Computing Annual Technical Report for the Period October 1, 1987 through September 30, 1988 |
18 OCT 88 |
|
| Authors:
A. A. Sawchuk; W. H. Steier; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This report summarizes the work in the center for the integration of optical computing. Topics reviewed include dynamic optical interconnection networks, low threshold laser arrays, array receivers, waveguide coupled photodiode arrays, optical processors for computer vision, subtraction in optical neural networks, nonlinear fabry-perot arrays, all optical associative memories, opto-optical switching, MBE growth and characterization of MQW structures, volume holograms and SLM's using MQW structures. Keywords include: Optical computing, Laser arrays, ... |
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| Practical Methods for Robust Multivariable Control |
28 SEP 88 |
|
| Authors:
Michael G. Safonov; Edmond A. Jonckheere; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The design of super maneuverable fighter aircraft, high-precision space-born optical tracking systems and transatmospheric hypervelocity vehicles will pose significant challenges to modern control system design theory. The theme of the research has been 'Making modern control theory work.' The product of the research has been theory, algorithms and software applicable to multivariable feedback control problems in which there are design constraints requiring robust attainment of stability and control performance objectives ... |
|
| Basic Research in Reliability for Real Systems |
05 AUG 88 |
|
| Authors:
Victor O. Li; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The goal of this research is to develop practical models and efficient algorithms to analyze the reliability/availability/maintainability of complex systems in which component failures are statistically dependent and each component is subject to degradations before complete failure. The Event-Based Reliability Model (EBRM) was developed to model and analyze the reliability of a network in which component failures are statistically dependent. In EBRM, the events that could cause component failures were ... |
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| Optical Beam Phase-Conjugation and Electromagnetic Scattering Process with Intense Fields |
09 MAY 88 |
|
| Authors:
Robert W. Hellwarth; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This project performed both theoretical and experimental studies of optical beam phase-conjugation and electromagnetic scattering processes with intense optical fields. New bounds are established on the power and energy required to perform useful wave mixing in certain classes of nonlinear media. New physical processes are discovered for optical beam phase conjugation. The first complete physical characterizations of monopolar and bipolar photorefractive crystals is performed. Keywords: Optical beam phase conjugation; Nonlinear ... |
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| Instrumentation for High Speed Phase Conjugation |
05 APR 88 |
|
| Authors:
Robert W. Hellwarth; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| With this equipment grant we have established and instrumented an optical laser source at 1.06 microns and three harmonics, with the added capability of a tunable dye laser pumped at any of these harmonics. Pulse lengths are available from 10 to 10(5) picosecond. Maximum pulse energy is 0.4 J at 1.06 microns in 4 nsec. First measurements on new optical polymers show them to be promising as stable room-temperature nonlinear ... |
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| Optical Nonlinearities in GaAs/GaAlAs Multiple Quantum Wells Fabricated by Metalorganic Chemical Vapor Deposition for Use in Optical Signal Processing |
DEC 87 |
|
| Authors:
E. Gamire; P. D. Dapkus; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Preparation of high quality GaAs/GaA1As Multiple quantum wells (MQW) grown by Metalorganic Chemical Vapor Deposition on GaAs substrates and measurement of nonlinear saturation has been completed in this 18 month contract. The results show materials which rivals the highest quality MQW's grown by any technique. Preparation of GaAs/GaA1As MQW's on GaP substrates and measurement of nonlinear saturation has been completed. It was shown that this material has high cw saturation ... |
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| The Algebraic Structure of Convolutional Codes |
25 SEP 87 |
|
| Authors:
Irving S. Reed; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| A new pruned-trellis search algorithm for high-rate convolutional code is developed. The search time and memory size is significantly reduced from standard search techniques. Some new high-rate systematic optimum convolutional codes of rate up to 7/8 have been found by this new search technique, and with constraint length up to 15. These newly found high-rate convolutional codes can be efficiently decoded using pruned, error-trellis, syndrome decoding. The real advantage of ... |
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| Adaptive Spread Spectrum Networks |
SEP 87 |
|
| Authors:
J. A. Silvester; A. Polydoros; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This report contains abstracts of all papers published during the course of the research. Keywords include: Networks, Spread spectrum networks, Packet radio networks, Random access networks, Algorithms, and Jamming. |
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| A VLSI Proposal with Application to Signal Processing and Coding |
MAR 87 |
|
| Authors:
Irving S. Reed; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| The era of the VLSI arrived, and its impact is evident in many areas of technology. The development of VLSI devices presents many new challenging areas of research. In this progress report attention is focused first on the algorithm development, the architecture and the circuit design of new and novel VLSI devices which can be used in signal processing and the related area of coding. Secondly, concern is directed towards ... |
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| Formal Models of Hardware and Their Applications to VLSI Design Automation |
24 DEC 86 |
|
| Authors:
Alice C. Parker; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| This final report describes research in high-level synthesis, and an associated problem, area estimation of integrated circuits. The approach taken is to create formal models of the problem being solved. Four major research results have been produced. First, an accurate technique for estimation of integrated circuit layout area from cell information has been developed. Second, optimal clocking scheme synthesis has been automated. Third, programs to design pipelined and non-pipelined data ... |
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| The Algebraic Structure of Convolutional Codes |
10 NOV 86 |
|
| Authors:
Irving S. Reed; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| A new error-trellis syndrome decoding scheme for convolutional codes is developed. It is demonstrated that the real advantage of error-trellis decoding over both Viterbi and sequential decoding of convolutional codes is the reduction of the number of states and transition between any two frames. An algebraic syndrome decoder is developed to find the best estimated message sequence for dual-K convolutional codes without finding minimum-error paths in an error-trellis diagram. A ... |
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| Basic Research in Reliability for Real Systems |
20 AUG 86 |
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| Authors:
Victor O. Li; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| The goal of our research is to develop practical models and efficient algorithms to analyze and evaluate the reliability/availability/maintainability of complex systems in which component failures are statistically dependent and each component is subject to degradations before complete failure. The Event- Based Reliability Model (EBRM) was developed to model and analyze the reliability of a network in which component failures are statistically dependent. In EBRM, the events that could cause ... |
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| Atomic Layer Epitaxy of III-V Compounds |
18 AUG 86 |
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| Authors:
Paul D. Dapkus; Curt Wittig; Susan Allen; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| This program is intended to develop a process for the growth of GaAs and related compounds by Atomic Layer Epitaxy (ALE). The program involves fundamental studies of gas phase kinetics of the organometallic and hydrides to be used in the process as well as surface reaction studies to determine the surface of various organometallics. We have chosen in this program to effect ALE growth in a dense H2 atmosphere. We ... |
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| Multiobjective Hierarchical Decision Problems in C3, IV |
24 JUN 86 |
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| Authors:
George P. Papavassilopoulos; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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| Two main lines of research were pursued under the support of this grant. The first one was the study of control laws in the presence of many controllers, each of which has his own objective and information, the decisions of each one influence the information and objectives of the others and where the controllers ignore several of the parameters involved in the description of the system equation and objectives. Ideas ... |
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