The long-term goals of this work are to improve ocean acoustic reverberation modeling and sonar performance predictions in shallow waters by developing inversion procedures to estimate seabed scattering and geoacoustic properties with uncertainties, as well as investigating the importance of various scattering processes. Important issues include: investigating the angular and frequency dependen...

Today, enterprises collect large amounts of data and leverage the cloud to perform analytics over this data. Since the data is often sensitive, enterprises would prefer to keep it confidential and to hide it even from the cloud operator. Systems such as CryptDB and Monomi can accomplish this by operating mostly on encrypted data; however, these systems rely on expensive cryptographic techniques...

JAMSTEC now has been developing several underwater platforms includes underwater vehicles as the useful tool to deal with various issues relating to the deep ocean. It is required that they are equipped with observation sensors to visualize deep-seabed including topography and benthic organism. One of methods to realize that is a stereo vision system. It can provide not only the 3D shape and co...

Utilization of non-destructive and non-invasive methods for the real-time underwater remote sensing is one of the challenging and desired tasks in the maritime security and safety as well as the harbour surveillance. Our aim was to develop and verify advanced electromagnetic sensors for a seabed objects detection and inspection. The seabed is a complex environment often covered with the sand, d...

The long-term goals of this work are to improve ocean acoustic reverberation modeling and sonar performance predictions in shallow waters by developing inversion procedures to estimate seabed scattering and geoacoustic properties with uncertainties, as well as investigating the importance of various scattering processes. Important issues include: investigating the angular and frequency dependen...

Considerable efforts have been devoted to the topic of wave–seabed interactions in last two decades because growing offshore activities. The existing studies based on one-way coupling approach. In this study, a new two-way algorithm is proposed overcome contradiction at fluid–sediment interface between physical process and theoretical models. numerical results indicates that seabed responses ob...

OBJECTIVES The specific objective of this project is to develop and validate theoretical and numerical models of the 3-D spatial statistics of the seismo-acoustic field produced by targets on and within a rough elastic seabed. These models are then applied to develop an improved understanding of the dominant physical processes governing the performance of moderate-to-high frequency sonar system...