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AlGaAs/GaAs heterostructures having different thicknesses of AlGaAs layers have been grown by Molecular Beam Epitaxy. Detailed Structural characterization of these structures has been performed and discussed in this report. AlGaAs layer thicknesses have been measured by an electrochemical Capacitance-Voltage profiler by etch profiling and confirmed by field emission scanning electron eicroscopy and...
This paper presents a new physics-based method for reliability prediction and modeling of Integrated Circuits (ICs). By implementing transistor degradation mechanisms via differential equations in the transistor compact model, the aging of the circuit can be simulated over (accelerated) time under real conditions. Actually, each transistor in the circuit integrates the voltage, current and temperature...
Rice growing regions plagued by arsenic-contaminated soils and irrigation water do not have a viable option for producing arsenic-free crops. For instance, in Bangladesh every year more than 30 million people are affected from rice-derived arsenic contamination that contributes to arsenic levels known to cause health-related illnesses. Our strategy is to genetically-modify molecular mechanisms involved...
The last four decades have seen the development of several mathematical models describing different aspects of blood glucose regulation, mainly the dynamics of glucose metabolism and the insulin action on glucose production and utilization. One of these models, developed by Ghosh and Maka involves representation of the glucose-insulin dynamics by a (piecewise affine) PWA model. The PWA modeling allows...
This paper investigates the implementation of output-delayed feedback control (ODFC) technique for controlling the sway angle of single pendulum gantry crane (SPGC) system. Linearized mathematical model of the SPGC in state space form is considered for the investigation. The designed ODFC has undergone complete stability analysis for a given controller gain.
Electricity is generated based on potential resources like coal, crude oil, water, wind, solar and nuclear energy. India depends largely on thermal power using coal as raw material despite the reality that indigenous stock of this raw material is depleting fast. At the same time coal based thermal stations are losing out financial viability gradually in terms of deteoriating efficiency, transmission...
The strategy of using an effective scheme to screen out a large number of stable contingencies and to apply detailed simulation programs only to potentially unstable contingencies is well recognized. This strategy is implemented in on-line voltage security assessment (VSA). This paper presents a hybrid of linear, quadratic and nonlinear methods for on-line VSA. Linear methods are fast but may not...
A robust Hinfin controller design in an LMI framework has been carried out for a load-frequency control problem of a single-area uncertain power system model. For carrying out this design, the uncertainties have been restructured by considering norm-bounded uncertainty instead of rank-1 uncertainty structure of . The proposed design is simple and can be easily solved to obtain optimal values of the...
This paper describes a method for improving the final accuracy and the convergence speed of Particle Swarm Optimization (PSO) by adapting its inertia factor in the velocity updating equation and also by adding a new coefficient to the position updating equation. These modifications do not impose any serious requirements on the basic algorithm in terms of the number of Function Evaluations (FEs). The...
Particle Swarm Optimization (PSO) has recently emerged as a nature inspired algorithm for real parameter optimization. This article describes a method for improving the final accuracy and the convergence speed of PSO by adding a new coefficient to the position updating equation and modulating the inertia weight. This work also mathematically analyzes the effect of this modification on the PSO algorithm...
The problem of optimal channel assignment has become increasingly important because of available frequency spectrum and increasing demand for cellular communication services. This has been shown to be an Np complete optimization problem. Many heuristic approaches including neural network, simulated annealing and genetic algorithm have been used to solve it. In this paper we propose a novel and efficient...
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