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Dive into the research topics where M.S. Fadali is active.

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Featured researches published by M.S. Fadali.


IEEE Transactions on Automatic Control | 1991

Optimal control of 2-D systems

Chiji Li; M.S. Fadali

Two-dimensional (2-D) optimal control theory that parallels one-dimensional (1-D) optimal control is developed. A generalized performance measure suited to 2-D systems is introduced. The canonical equations associated with this performance measure and a general nonlinear model are obtained. The 2-D linear quadratic regulator problem is formulated, and its canonical equations are derived for the Roesser model. An earlier result by T. Kaczorek and J. Klamka (1986) for the solution of the minimum-energy problem with fixed-final local state is rederived using this approach. A new problem, minimum-energy with fixed-final-pass local states is formulated and solved, and a numerical example is given. >


american control conference | 1998

Fault detection for systems with multirate sampling

M.S. Fadali; W. Liu

We consider multirate sampled-data systems with a single input sampling period and multiple output sampling periods that are integer multiples of the input sampling period. We modify the Chow-Willsky approach to obtain a residual generator design for this class of multirate systems. We derive conditions for the existence of residual generators that guarantees fault detection and disturbance rejection. We also derive conditions of the existence of a structured residual generator. An example is presented to illustrate our approach.


Computers & Electrical Engineering | 2003

Observer-based robust fault detection of multirate linear system using a lift reformulation

M.S. Fadali

Abstract This paper presents observer-based robust fault detection for multirate sampled-data linear system. It is assumed that all plant inputs are updated with a unique sampling period and that the plant outputs are sampled uniformly at integer multiples of the input sampling period. A state observer is constructed, as in the single-rate case, and a residual generator is derived. The paper shows that the residual signals can be decoupled from noise and disturbances. An illustrative numerical example is provided.


IEEE Transactions on Automatic Control | 1992

Variable structure control using system decomposition

M. A. Zohdy; M.S. Fadali; J. Liu

An approach to the design of large variable structure systems subject to control bounds is introduced. The method includes a switching hyperplane design based on generalized inverses and system decomposition. To ensure reaching the hyperplane and achieving a sliding condition, the control is switched between local equivalent control and bounded corrective control. The design of the corrective control component is completed using system decomposition into smaller subsystems. An estimate of the domain of attraction corresponding to the bounded control is obtained and used to select the appropriate controller bounds. The method is illustrated using a fifth-order numerical example. >


american control conference | 2003

H/sub 2/ robust fault estimation for periodic systems

M.S. Fadali; Patrizio Colaneri; M. Nel

We provide a robust fault estimation and isolation scheme for periodic systems. The observer is designed using an H/sub 2/ estimation approach with the fault considered as an input to the system. The model used for residual generation provides robustness with respect to disturbance inputs. Two illustrative examples, including computer simulation of periodic systems, are provided.


american control conference | 2002

A non-intrusive Kalman filter-based tracker for pursuit eye movement

M.S. Fadali; George Bebis

In this paper, we introduce a new non-intrusive approach to estimating the eye position during pursuit motion of the eye. We introduce a new characterization for the pursuit eye movement. Our characterization is based on the decomposition of the pursuit eye motion into a deterministic component and random component. We use a discrete Kalman filter to estimate the random component and calculate the deterministic component. We add the two components to obtain an estimate of the eye position. Simulation results are provided to illustrate the eye position estimation.


systems man and cybernetics | 1989

A fuzzy logic/neural system approach to signal processing in large scale decision systems

Edgar C. Tacker; C.G. Looney; M.S. Fadali; D.D. Egbert

A class of large-scale decision systems is described, and a multilevel, multi-intelligence information/knowledge/control structure is defined. The description is in a form that features the various levels of signal processing, data fusion, autonomous fuzzy logic and pattern recognition (via neural networks), system knowledge base, and personal expert system, and the way in which these processors are integrated so as to form an operational model for the overall decision system.<<ETX>>


Astronomical Telescopes and Instrumentation | 2003

UMBRAS: a matched occulter and telescope for imaging extrasolar planets

Alfred B. Schultz; Ian J. E. Jordan; M. C. Kochte; Dorothy A. Fraquelli; Fred C. Bruhweiler; J. M. Hollis; Kenneth G. Carpenter; Richard G. Lyon; Mike A. DiSanti; C. L. Miskey; Jesse Leitner; Richard D. Burns; Scott R. Starin; M. Rodrigue; M.S. Fadali; Dennis L. Skelton; H. M. Hart; F. C. Hamilton; Kwang-Ping Cheng

We describe a 1-meter space telescope plus free-flying occulter craft mission that would provide direct imaging and spectroscopic observations of Jovian and Uranus-sized planets about nearby stars not detectable by Doppler techniques. The Doppler technique is most sensitive for the detection of massive, close-in extrasolar planets while the use of a free-flying occulter would make it possible to image and study stellar systems with planets comparable to our own Solar System. Such a mission with a larger telescope has the potential to detect earth-like planets. Previous studies of free-flying occulters reported advantages in having the occulting spot outside the telescope compared to a classical coronagraph onboard a space telescope. Using an external occulter means light scatter within the telescope is reduced due to fewer internal obstructions and less light entering the telescope and the polishing tolerances of the primary mirror and the supporting optics can be less stringent, thereby providing higher contrast and fainter detection limits. In this concept, the occulting spot is positioned over the star by translating the occulter craft, at distances of 1,000 to 15,000 kms from the telescope, on the sky instead of by moving the telescope. Any source within the telescope field-of-view can be occulted without moving the telescope. In this paper, we present our current concept for a 1-m space telescope matched to a free-flying occulter, the Umbral Missions Blocking Radiating Astronomical Sources (UMBRAS) space mission. An UMBRAS space mission consists of a Solar Powered Ion Driven Eclipsing Rover (SPIDER) occulter craft and a matched (apodized) telescope. The occulter spacecraft would be semi-autonomous, with its own propulsion systems, internal power (solar cells), communications, and navigation capability. Spacecraft rendezvous and formation flying would be achieved with the aid of telescope imaging, RF or laser ranging, celestial navigation inputs, and formation control algorithms.


american control conference | 2002

A new approach for designing TSK fuzzy systems from input-output data

A. Sonbol; M.S. Fadali

We propose a new approach for determining fuzzy membership functions for system inputs and outputs and for defining the rule base systematically from input-output pairs. This approach treats a human-operated system as a black box and does not require knowledge of its underlying mathematical model. We provide an upper bound on the error resulting from approximating the input-output data using a fuzzy system. To demonstrate the ease and power of the new approach, we apply it to the benchmark problem of backing up a truck into a loading dock. The results show that the fuzzy controller can be chosen as a compromise between the conflicting requirements of tracking accuracy and simplicity of implementation.


frontiers in education conference | 1998

A model to promote the study of engineering through a capstone course for pre service secondary science and mathematics teachers

M. Robinson; M.S. Fadali

The US is trying to maintain its competitive edge among industrial nations by training a sufficient number of engineers. However, the number of trained individuals graduating from US colleges does not meet our current and projected needs. In addition, the number of females and minority graduates with engineering degrees is unacceptably low and the attrition rate in engineering programs is unacceptably high. The causes include: (i) the inadequate preparation of our high school graduates, (ii) unfavorable attitudes toward engineering and other science based careers, (iii) the absence of continuity in the transition from high school to college, and (iv) teacher-centered teaching methods in engineering programs. Some additional preparation for secondary science and mathematics teachers as well as high school courses that are more friendly to engineering and technology would address the first three above perceived causes. The use of more student-directed instruction might address the fourth perceived cause. To this end, it is suggested that colleges of engineering and education collaborate to develop capstone courses for secondary science and mathematics pre-service and in-service teachers. To our knowledge, no model has been proposed to design capstone engineering courses that train pre-service and in-service secondary science and mathematics teachers in engineering principles, practice, design, and problem solving skills. The authors describe a new capstone course.

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M. A. Zohdy

University of Rochester

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Alfred B. Schultz

Space Telescope Science Institute

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C. L. Miskey

The Catholic University of America

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Dorothy A. Fraquelli

Space Telescope Science Institute

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Ian J. E. Jordan

Space Telescope Science Institute

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M. C. Kochte

Space Telescope Science Institute

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J. Liu

Nanyang Technological University

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H. M. Hart

Computer Sciences Corporation

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F. C. Hamilton

Space Telescope Science Institute

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