Vasundara V. Varadan

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OBJECTIVE AND BACKGROUND Objective monitoring of cough may be preferred to subjective reporting of the symptom in clinical and research settings. Therefore, a self-contained, ambulatory cough monitoring system is needed that is non-invasive, usable for children and adults of all ages, inexpensive, and highly accurate with easy to use analysis software. (More)
This numerical study presents a detailed optimal control design based on the general finite element approach for the integrated design of a structure and its control system. Linear quadratic (LQ) theory with output feedback is considered on the basis of the state space model of the system. Three-dimensional finite elements are used to model the smart(More)
The purpose of this work is to develop a numerical code for modeling the performance of thin film plasmonic solar cells performing a detailed analysis of both the light interaction with the solar cell and the resulting charging transport due to the photovoltaic effect. The continuity and Poisson equations were modeled in each layer of thin film silicon(More)
In this paper we present the characterization of materials commonly used in manufacturing thin film solar cells (TFSCs) using spectroscopic ellipsometry. In recent times, photovoltaic research has witnessed a steady increase in the field of TFSCs. Thin film solar cells have a lot of advantages over their crystalline silicon (c-Si) counterparts-their low(More)
Metamaterials are increasingly being proposed for many different microwave applications. Metamaterials are highly resonant structures and metamaterial device design is based on the resonance frequency for both civilian and military applications. These applications are often in a high-temperature environment. In this paper, we have performed an experimental(More)
Improvised explosive devices (IEDs) represent one of the most significant and deadly threats faced by armed service personnel and innocent civilians in current conflicts. Related threats refer to terrorists and suicide bombers who have caused large numbers of civilian deaths in non-war settings such as 9/11 and the commuter train bombings in the United(More)
The finite-element method of analysis is unrestricted by size considerations and is well suited for the study of very small structures such as MEMS devices embedded in structures. This paper presents the numerical approach and results for a silicon-based micro-flow sensor for pulsed-flow sensing. The new approach presented here is the treatment of transient(More)
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