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Jeff Simmen

APL-UW Executive Director

Email

simmen@apl.washington.edu

Phone

206-543-1310

Biosketch

Jeffrey Simmen is the seventh Director in APL-UW's nearly 70-year history. His career has been linked closely to the U.S. Navy. For ten years he led the Office of Naval Research Ocean Acoustics Program where he created a program that balanced experiment and theory, and included the disciplines of oceanography, signal processing, physics, engineering, and applied mathematics.

Dr. Simmen graduated from the California Institute of Technology with a degree in applied mathematics, earned an M.S. from Cornell University in theoretical and applied mechanics, and a Ph.D. from Caltech in applied mathematics. He became APL-UW Director in July 2003.

Department Affiliation

Director's Office

Education

B.S. Applied Mathematics, California Institute of Technology, 1977

M.S. Theoretical and Applied Mechanics, Cornell University

Ph.D. Applied Mathematics, California Institute of Technology

Publications

2000-present and while at APL-UW

Preface: Advances in Ocean Acoustics

Zhou, J., Z. Li, and J. Simmen, "Preface: Advances in Ocean Acoustics," Proc., 3rd International Conference on Ocean Acoustics, 21-25 May, Beijing, China. AIP Conf. Proc., 1495, 1-2, doi:10.1063/1.4765903, 2012.

21 May 2012

Fifteen years of U.S.-China cooperative research in underwater acoustics: 1995-2010

Livingston, E., and J. Simmen, "Fifteen years of U.S.-China cooperative research in underwater acoustics: 1995-2010," In Proceedings, Second International Shallow-Water Acoustics Conference (SWAC'09), Shanghai, 16-20 September 2009, 1-10 (AIP, 2010).

4 Oct 2010

Overview of the results from the Asian Seas International Acoustics Experiment in the East China Sea

Dahl, P.H., R. Zhang, J.H. Miller, L.R. Bartek, Z. Peng, S.R. Ramp, J.-X. Zhou, C.S. Chiu, J.F. Lynch, J.A. Simmen, and R.C. Spindel, "Overview of the results from the Asian Seas International Acoustics Experiment in the East China Sea," IEEE J. Ocean. Eng., 29, 920-928, doi:10.1109/JOE.2005.843159, 2004.

More Info

1 Oct 2004

The Asian Seas International Acoustics Experiment (ASIAEX) included two major field programs, one in the South China Sea and the other in the East China Sea (ECS). This paper presents an overview of research results from ASIAEX ECS conducted between May 28 and June 9, 2001. The primary emphasis of the field program was shallow-water acoustic propagation, focused on boundary interaction and geoacoustic inversion. The study area's central point was located at 29° 40.67'N, 126° 49.39'E, which is situated 500 km east of the Chinese coastline off Shanghai. The acoustic and supporting environmental measurements are summarized, along with research results to date, and references to papers addressing specific issues in more detail are given.

More Publications

Reverberation vertical coherence and sea-bottom geoacoustic inversion in shallow water

Zhou, J.-X., X.-Z. Zhang, P.H. Rogers, J.A. Simmen, P.H. Dahl, G. Jin, and Z. Peng, "Reverberation vertical coherence and sea-bottom geoacoustic inversion in shallow water," IEEE J. Ocean. Eng., 29, 988-999, doi:10.1109/JOE.2004.836401, 2004.

More Info

1 Oct 2004

Optimal array-processing techniques in the ocean often require knowledge of the spatial coherence of the reverberation. A mathematical model is derived for the reverberation vertical coherence (RVC) in shallow water (SW). A method for analysis of RVC data is introduced. Measured reverberation cross-correlation coefficients as a function of time and frequency, obtained during the Asian Seas International Acoustic Experiment (ASIAEX) in the East China Sea, are reported. SW reverberation from a single shot provides a continuous spatial sampling of the surrounding sound field up to several tens of kilometers and holds valuable information on the geoacoustic properties of the sea floor over this distance. SW reverberation data can, therefore, be used as the basis for a quick and inexpensive method for geoacoustic inversion and has the obvious advantage that acquiring the data in situ requires only a single platform. This paper considers the use of the vertical coherence of the reverberation as the starting point for such an inversion. Sound speed and attenuation in the sea bottom at the ASIAEX site are obtained over a frequency range of 100-1500 Hz by finding values that provide the best match between the measured and predicted RVC.

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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