@conference {
	title = {Performance evaluation of run-to-run control methods in semiconductor processes},
	author = {Zhang, Chang., Deng, Hao., Baras, John S.},
	year = {2003},
	month = {06/2003},
	abstract = {Run-to-run (RtR) control plays an important role in semiconductor manufacturing processes. In this paper, RtR control methods are classified and evaluated. The set-valued RtR controllers with ellipsoid approximation are compared with two typical RtR controllers: the exponentially weighted moving average (EWMA) controller and the optimizing adaptive quality controller (OAQC) by simulations according to the following criteria: a good RtR controller should be able to compensate for various disturbances, such as small drifts, step disturbances and model errors; moreover, it should be able to deal with bounds, cost requirement and multiple targets that are often encountered in semiconductor processes. Based on our simulation results, suggestions on selection of a proper RtR controller for a semiconductor process are given as conclusions.},
	address = {Istanbul, Turkey},
	booktitle = {2003 IEEE Conference on Control Applications},
	pages = {pp. 841-848}
}
@conference {
	title = {Jitter analysis of CBR streams in multimedia networks},
	author = {Jou,  Jia-Shiang., Baras, John S.},
	year = {2003},
	month = {06/2003},
	abstract = {The performance of real-time applications such as video and voice streams relies on packet delay jitter. Large delay jitter causes buffer overflow or underflow at the receiver end and the user encounters interrupt. The delay jitter is mainly due to the perturbation of background traffic in the bottleneck router. Fulton and Li (1998) provide an analytical approximation for the first-order and second-order statistics of delay jitter. However, their analysis is based on a Markovian model of the background traffic, which is not quite suitable for Internet traffic and requires lots of computational effort. We propose an efficient method to predict the jitter variance of a CBR (constant-bit-rate) connection based on the wavelet model of the background traffic. The wavelet analysis extracts the statistical properties of background traffic and the analysis result can be used to predict an upper bound for the jitter variance of the CBR connection.},
	address = {Istanbul, Turkey},
	booktitle = {2003 IEEE Conference on Control Applications},
	pages = {pp. 1339-1344}
}
@conference {
	title = {Markov Processes with State-Dependent Failure Rates and Application to RED and TCP Window Dynamics},
	author = {Misra, Archan., Ott, Teunis., Baras, John S.},
	year = {2003},
	month = {06/2003},
	abstract = {This paper presents a mathematical technique for computing the stationary distribution of Markov processes that evolve deterministically between arbitrarily distributed {\textquoteleft}failure events{\textquoteright}. The key innovation in this paper is the use of a state-dependent time rescaling technique, such that the re-scaled process can be described by a Poisson-interrupted stochastic differential equation. This technique is first applied to compute the stationary window distribution of a TCP flow performing idealized classical congestion avoidance under variable, but state-dependent, packet loss, and subsequently, to study the distribution of a TCP flow performing generalized congestion avoidance. We show how the stochastic differential equation can be solved by a rapidly convergent numerical technique to obtain the stationary distribution in the re-scaled (subjective) time, and present the re-scalings needed to eventually obtain the distribution of the original Markov process. We demonstrate how this analysis can be used to compute the window distribution of a TCP flow interacting with a RED, ERD or ECN queue, with or without minimally assured throughput guarantees.},
	address = {Rhodes, Greece},
	booktitle = {11th Mediterranean Conference on Control and Automation (MED\&rsquo;03)}
}
@conference {
	title = {A New Adaptive Aggregation Algorithm for Infinite Horizon Dynamic Programming},
	author = {Zhang, Chang., Baras, John S.},
	year = {2003},
	month = {06/2003},
	abstract = {Dynamic programming suffers the {\textquotedblleft}curse of dimensionality{\textquotedblright} when it is employed for complex control systems. State aggregation is used to solve the problem and accelerate computation by looking for a sub-optimal policy. In this paper, a new method, which converges much faster than conventional aggregated value iteration based on TD(0), is proposed for computing the value functions of the aggregated system. Preliminary results show that the new method increases the speed of convergence impressively. Aggregation introduces errors inevitably. An adaptive aggregation scheme employing the new computation method is also proposed to reduce the aggregation errors.},
	address = {Rhodes, Greece},
	booktitle = {11th Mediterranean Conference on Control and Automation (MED\&rsquo;03)},
	pages = {pp. 1-6}
}
@conference {
	title = {Towards automated negotiation of access control policies},
	author = {Baras, John S., Bharadwaj, Vijay G.},
	year = {2003},
	month = {06/2003},
	abstract = {We examine the problem of negotiating access control policies between autonomous domains. Our objective is to develop software agents that can automatically negotiate access control policies between autonomous domains with minimal human guidance. In this paper, we show a mathematical framework that is capable of expressing many such negotiation problems~and illustrate its application to some practical scenarios.},
	address = {Lake Como, Italy},
	booktitle = {4th International Workshop on Policies for Distributed Systems and Networks},
	pages = {pp. 111-119}
}
@conference {
	title = {A dynamic model for magnetostrictive hysteresis},
	author = {Tan, Xiaobo., Baras, John S., Krishnaprasad, P S.},
	year = {2003},
	month = {06/2003},
	abstract = {The rate-dependent hysteresis present in thin magnetostrictive actuators can be captured by a dynamic model, consisting of a Preisach operator coupled to an ordinary differential equation in an unusual way. The model presents interesting problems in analysis and computation due to its special structure. In this paper, we first transform the model into a more amenable form and gain insight into the model by introducing a new hysteretic operator. Then we investigate some system-theoretic properties of the model: stability of equilibria, input-output stability, reachability~and observability. Existence of periodic solutions under periodic forcing is also established. Finally, numerical integration schemes for the model are discussed.},
	address = {Denver, Colorado},
	booktitle = {2003 American Control Conference},
	pages = {pp. 1074-1079}
}
@conference {
	title = {A robust control framework for smart actuators},
	author = {Tan, Xiaobo., Baras, John S.},
	year = {2003},
	month = {06/2003},
	abstract = {Hysteresis in smart actuators presents a challenge in control of these actuators. A fundamental idea to cope with hysteresis is inverse compensation. But due to the open loop nature of inverse compensation, its performance is susceptible to model uncertainties and to errors introduced by inverse schemes. In this paper, we develop a robust control framework for smart actuators by combining inverse control with the l/sub 1/ robust control theory, where the inversion error is modeled as an exogenous disturbance with a magnitude bound quantifiable in terms of parameter uncertainties and inversion schemes. Through the example of controlling a magnetostrictive actuator, we present a systematic controller design method which guarantees robust stability and robust trajectory tracking while taking actuator saturation into account. Simulation and experimental results are provided.},
	address = {Denver, Colorado},
	booktitle = {2003 American Control Conference},
	pages = {pp. 4645-4650}
}
