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  • M. Sridharan , M. V. Salapaka, A. Somani, “A Practical Approach to Operating Survivable WDM Networks”, Special Issue on WDM Based Network Architectures, IEEE Journal on Selected Areas in Communications on WDM-based Network Architectures. vol. 20, no. 1, January 2002. 

  • M. Sridharan, A. Somani, M. V. Salapaka , “Approaches for Capacity and Revenue Optimization in Survivable WDM Networks”, 
    Spl. Issue on Survivable Optical Networks, Journal of High Speed Networks, August 2001. vol. 10, no. 2, pp. 109 -125.

  • V. Ramakrishna, M. V. Salapaka, M. Dahleh, H. Rabitz, and A. Pierce, "Controllability of molecular systems", Physical Review A., V51, no. 2:pp. 960-966, Feb 1995. 

    • In this paper we analyze the controllability of quantum systems arising in molecular dynamics. We model these systems as systems with finite number of levels, and examine their controllability. To do this we pass to their uintary generators and use results on controllability of invariant systems on Lie groups. Examples of molecular systems, modeled as finite dimensional control systems are provided. A simple algorithm to detect controllability of a molecular system is provided. Finally, we apply this algorithm to a five-level system. 

  • D. Sahoo, M. V. Salapaka, Al-Omari, R. Somani A. Manimaran, G. “ Feedback Control theory for Real-time Scheduling” Proceedings of the American Control Conference, Anchorage, 2002.

    • In this paper, we discuss an open-loop dynamic scheduling algorithm that employs a notion of task overlap in the scheduler in order to provide some flexibility in task execution time. Then we present a novel closed-loop approach for dynamically estimating the execution time of tasks based on both deadline miss ratio and task rejection ratio in the system. This approach is highly preferable for firm/soft real-time systems since it provides a firm performance guarantee in terms of deadline misses while achieving a high guarantee ratio. We design proportional-integral controller and H-infinity controller for closed loop scheduling. We evaluate the performance of the open-loop and the closed-loop approaches using simulation studies. We show that the closed-loop dynamic scheduling offers a better performance over the open-loop scheduling under all practical conditions.

  • D. Sahoo, M. V. Salapaka, “Constructive control for quantum mechanical systems”, IEEE Conference on Control and Decision Conference, Volume: 2 , 2001 Page(s): 1601 -1606. 

    • In this paper we develop a method for exact constructive controllability of quantum mechanical systems. The method has three steps, first a path from the initial state to the final state is determined and intermediate points chosen such that any two consecutive points are close, next small sinusoidal control signals are used to drive the system between the points, and finally quantum measurement technique is used to exactly achieve the desired state. The methodology is demonstrated for the control of spin-half particles in a Stern-Gerlach setting.