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Oscar D. Crisalle
Professor
Ph.D., 1990, University of California-Santa Barbara (1991)
Robust control of parametrically uncertain plants
Computer aided analysis and design of control systems
Adaptive and predictive control strategies
Manufacture of photovoltaic devices
Real-time remote control over the Internet
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Brief Description of Current Research
Models of processing systems only approximate
physical reality. A major challenge addressed by our research is to
design controllers that, in spite of the uncertainty present in the
model, can deliver high performance and also guarantee system stability.
Such controllers are called robust. The research focuses on the
synthesis of robust controllers using methodologies such as
pole-placement, predictive-control, and frequency-domain techniques
based on the novel concept of a Nyquist Robust Stability Margin
proposed by our group.
 Since many processes of interest are inherently
bilinear, controllers designed using linear theory may experience severe
performance degradation. Appropriate control designs that address
relevant nonlinear features are needed. We are investigating the use of
new methods for the analysis and design of adaptive, predictive, and
sliding-mode control strategies, and the integration of the resulting
techniques within the framework of computer aided tools.
Experimental research initiatives address the
manufacture of thin-film photovoltaic devices. Novel photo-absorber
materials are synthesized and characterized using a plasma
migration-enhanced epitaxial growth reactor that is capable of growing
single-crystal thin films. In addition, photovoltaic buffer films are
grown and optimized using chemical bath deposition methods, and
transparent conducting oxides are deposited via magnetron sputtering
methods, giving our group full capabilities for manufacturing and
testing thin-film photovoltaic cells that achieve desirable
solar-energy-to-electricity conversion efficiencies.
Other experimental studies focus on the
technological challenges posed by processes used for production of
wood-pulp and paper. We are developing new viscosity sensors as well as
supporting control strategies designed to optimize the black-liquor
recovery process. Testing is done in a pilot plant and an industrial
scale wood-chip digestor.
Selected Publications
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"Removal of Nonionic Organic Pollutants from Water
via Liquid-Liquid Extraction", by Juan C. López-Montilla, Samir Pandey,
Dinesh O. Shah, and Oscar D. Crisalle, Journal of Water Research (to
appear, 2005).
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"Reaction Kinetics of CuInSe2 Thin Films Grown
from Bilayer InSe/CuSe Precursors," by S. Kim, W. K. Kim, E. A. Payzant, R.
M. Kaczynski, R. D. Acher, S. Yoon, T. J. Anderson, O. D. Crisalle, and S.
S. Li, Journal of Vacuum Science and Technology A (to appear, 2005).
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"A Multidisciplinary Virtual Control Laboratory
Paradigm for Teaching Control Engineering ", by Oscar D. Crisalle, Denis
Gillet, Christopher S. Peek, and Samuel Depraz, International Journal of
Engineering Education (to appear, 2005).
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"Investigation of Pulsed Non-Melt Laser Annealing
on the Film Properties and Performance of Cu(In,Ga)Se2 Solar Cells, by Xuege
Wang, Sheng S. Li, C. H. Huang, S. Rawal, J. M. Howard, V. Craciun, T. J.
Anderson, and O. D. Crisalle, Journal of Solar Energy Materials and Solar
Cells (to appear, 2005).
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"The Nyquist Robust Sensitivity Margin for
Uncertain Closed-Loop Systems", by Saleh A. Al-Shamali, Baowei Ji, O. D.
Crisalle, and H. A. Latchman, International Journal of Robust and
Nonlinear Control (to appear 2005).
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"Evaluation of a Capillary-Coriolis Instrument for
On-Line Viscosity and Density Measurements of Kraft Black Liquor", by A. P.
Dutka, V. R. Basker, O. D. Crisalle, A. L. Fricke, and P. Kalotay, TAPPI
Journal, Vol. 3, No. 3, pp. 17-24 (2004).
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"Robustness of Classical Tuning Correlations for
Proportional-Integral Controllers", by C. T. Baab, H. A. Latchman, and O. D.
Crisalle, American Control Conference, Denver, CO, pp. 4997-5002
(2003).
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