@conference {
	title = {Nonlinear Hoo Control with Delayed Measurements},
	author = {Baras, John S., Patel, Nital S.},
	year = {1997},
	month = {07/1997},
	abstract = {This paper considers the nonlinear H-infinity control problem for systems subject to delayed measurements. Necessary and sufficient conditions for the solvability of the problem are presented. A key point of our approach is the extension of the information state concept. In particular, the information state is no longer the "worse case cost to come" function. We also present the certainty equivalence principle for such systems, and draw an analogy with the solution to the linear case. The paper ends with an example.},
	address = {Brussels, Belgium},
	booktitle = {4th European Control Conference (ECC\&rsquo;97)}
}
@conference {
	title = {Reduced Complexity Nonlinear H$\infty$ Controllers: Relation to Certainty Equivalence},
	author = {Baras, John S., Patel, Nital S.},
	year = {1996},
	month = {06/1996},
	abstract = {This paper considers the problem of constructing reduced complexity controllers for output feedback nonlinear H$\infty$ control. Conditions are obtained under which such controllers achieve the closed loop performance requirements. These controllers are non-optimal in general. However, in case optimality holds, they are in fact the certainty equivalence controllers. Conditions under which certainty equivalence holds are simplified and linked to the solvability of a functional equation.},
	address = {San Francisco, CA},
	booktitle = {IFAC\&rsquo;96, 13th World Congress International Federation of Automatic Control},
	pages = {pp. 383-387}
}
@conference {
	title = {Robust Control of Semiconductor Manufacturing Processes},
	author = {Baras, John S., Patel, Nital S.},
	year = {1996},
	month = {06/1996},
	abstract = {This paper considers the control of semiconductor manufacturing processes. We start by considering the run to run control problem. We pose the problem in a risk-sensitive control framework, and derive the recursion for the information state. We then take large deviation type limits, and go on to show that the limiting information state recursion is related to that arising in solving ultimate boundedness control problems. For completeness we present the solution to the deterministic problem. The paper ends with an example involving application of run to run control to end-pointing.},
	address = {Williamsburg, VA},
	booktitle = {AMS-SIAM Summer Seminar on Mathematics of Stochastic Manufacturing Systems, Lectures in Applied Mathematics}
}
@conference {
	title = {Robust Nonlinear Control of a Rapid Thermal Processor},
	author = {Baras, John S., Patel, Nital S.},
	year = {1996},
	month = {05/1996},
	abstract = {This paper presents application of robust multivariable nonlinear control to the temperature control problem for rapid thermal processing systems. The controller designed achieves good tracking and temperature uniformity for a wide range of processing conditions.},
	address = {Los Angeles, CA},
	booktitle = {13th International Conference on Chemical Vapor Deposition (CVD-XIII)},
	pages = {pp. 171-176}
}
@conference {
	title = {Information State for Robust Control of Set-Valued Discrete Time Systems},
	author = {Baras, John S., Patel, Nital S.},
	year = {1995},
	month = {12/1995},
	abstract = {We consider the problem of robust output feedback control of set-valued discrete time systems. Such systems appear frequently in applications such as process control. The aim is to motivate and obtain an efficient formulation of robust control problems and the resulting structure of the controller for such systems. This formulation, and the controller structure are obtained by taking small noise limits of the information state dynamics arising in a related risk-sensitive stochastic control problem. The necessary and sufficient conditions for solvability are also presented.},
	address = {New Orleans, Louisiana},
	booktitle = {The 34th IEEE Conference on Decision and Control},
	pages = {pp. 2302-2307}
}
@conference {
	title = {Designing Response Surface Model Based Run by Run Controllers: A New Approach},
	author = {Baras, John S., Patel, Nital S.},
	year = {1995},
	month = {10/1995},
	abstract = {This paper presents a framework for carrying out robust Run by Run (RbR) control via a set-theoretic approach. In particular the RbR controller developed tries to minimize the worst case performance of the plant. This gives us a methodology to handle uncertainty. An interesting consequence of using the set valued approach is that now we can relax the assumptions made on the statistics of the noise. Hence, we can also deal with non-Gaussian and correlated noise. We provide results comparing the performance of the controller to a recursive least squares based controller.},
	address = {Austin, Texas},
	booktitle = {The 1995 International Electronic Manufacturing Technology Symposium},
	pages = {pp. 210-217}
}
@conference {
	title = {Robust Control of Discrete Time Generalized Dynamical Systems: Finite and Infinite Time Results},
	author = {Baras, John S., Patel, Nital S.},
	year = {1995},
	month = {06/1995},
	abstract = {This paper deals with the output feedback robust control of discrete time systems modeled as dynamic inclusions. This formulation allows for the more typical in practice situation of non-additive disturbances. The control problem is solved via dynamic programming. Separation between estimation and control is achieved by using the concept of an information state. The nature of the information state is investigated.},
	address = {Seattle, Washington},
	booktitle = {The 1995 American Control Conference},
	pages = {pp. 1990-1994}
}
@conference {
	title = {Derivation of Fuzzy Rules for Parameter Free PID Gain Tuning},
	author = {Baras, John S., Patel, Nital S.},
	year = {1994},
	month = {05/1994},
	abstract = {In this paper, rules for a fuzzy logic based PID tuner (expert) for stable dominant pole plants with large rise times are derived. Applications of the expert to separator temperature control, and to pH control are presented. It is observed that the expert can successfully tune the PID gains without requiring any process identification.},
	address = {Kyoto, Japan},
	booktitle = {The IFAC Symposium on Advanced Control of Chemical Processes (ADCHEM{\textquoteright}94)},
	pages = {pp. 319-324}
}
@article {
	title = {Robust Control of Set-Valued Discrete Time Dynamical Systems},
	author = {Baras, John S., Patel, Nital S.},
	year = {1998},
	month = {01/1998},
	abstract = {This paper presents results obtained for the control of set-valued discrete-time dynamical systems. Such systems model nonlinear systems subject to persistent bounded noise. A robust control problem for such systems is introduced. The problem is formulated as a dynamic game, wherein the controller plays against the set-valued system. Both necessary and sufficient conditions in terms of (stationary) dynamic programming equalities are presented. The output feedback problem is solved using the concept of an information state, where a decoupling between estimation and control is obtained. The methods yield a conceptual approach for constructing controlled-invariant sets and stabilizing controllers for uncertain nonlinear systems.},
	pages = {pp. 61-75},
	volume = {Vol. 43},
	number = {No. 1},
	journal = {IEEE Transactions on Automatic Control.}
}
@article {
	title = {A Framework for Robust Run by Run Control with Lot Delayed Measurements},
	author = {Baras, John S., Patel, Nital S.},
	year = {1997},
	month = {02/1997},
	abstract = {This paper considers the run by run control problem. We develop a framework to solve such a problem in a robust fashion. The framework also encompasses the case when the system is subject to delayed measurements. Recent results available for the control of such systems are reviewed, and two examples are presented. The first example is based on the end-pointing problem for a depositional process and is subject to noise which has both Gaussian and uniform components. The second one is concerned with rate control in an LPCVD reactor.},
	pages = {pp. 75-83},
	volume = {Vol. 10},
	number = {No. 1},
	journal = {IEEE Transactions on Semiconductor Manufacturing}
}
@article {
	title = {Designing Response Surface Model Based Run by Run Controllers: A Worse Case Approach},
	author = {Baras, John S., Patel, Nital S.},
	year = {1996},
	month = {04/1996},
	abstract = {This paper presents a framework for carrying out run-by-run (RbR) control via a deterministic worst-case approach. In particular, the RbR controller developed tries to minimize the worst-case performance of the plant. This yields a methodology for handling uncertainty. A consequence of using the deterministic approach is that we no longer need any assumptions on the statistics of the noise. Rather, what we require is that the noise be bounded. Thus, we can also deal with non- Gaussian and correlated noise. We provide results comparing the performance of the controller to a recursive least squares (US) based controller.},
	pages = {pp. 98-104},
	volume = {Vol. 19},
	number = {No. 2},
	journal = {IEEE Transactions on Components, Packaging, and Manufacturing Technology, Pt C: Manufacturing}
}
@article {
	title = {Derivation of Fuzzy Rules for Model Free Tuning of PID Controllers},
	author = {Baras, John S., Patel, Nital S.},
	year = {1995},
	month = {01/1995},
	abstract = {In this article, we derive the rules for a fuzzy logic based PID tuner (expert) for dominant pole systems with large rise times. We present applications of the expert to a third-order plant, separator temperature control, and pH control. It is observed that the expert can successfully tune the PID gains without requiring any process identification.},
	pages = {pp. 59-69},
	volume = {Vol. 3},
	number = {Issue I},
	journal = {Journal of Intelligent and Fuzzy Systems}
}
