My primary research interest at present is observational astronomy of asteroids, a.k.a. minor planets, using the USNA 20-inch telescope. In the past I've worked on Microelectromechanical Systems (MEMS), particularly directional acoustic sensors.
Downey, R. H., & Karunasiri, G. (2014). Reduced residual stress curvature and branched comb fingers increase sensitivity of MEMS acoustic sensor. Microelectromechanical Systems, Journal of, 23 (2), 417-423.
Downey, R. H., Brewer, L. N., & Karunasiri, G. (2013). Determination of mechanical properties of a MEMS directional sound sensor using a nanoindenter. Sensors and Actuators A: Physical, 191, 27-33.