This paper reports the development and field testing of DVLNAV, an interactive program for precision three-dimensional navigation of underwater vehicles. We report the results of preliminary field trials of DVLNAV with the Jason II underwater robot. The performance of bottom lock doppler navigation is evaluated with respect to long baseline acoustic navigation.

Micro-electronic devices are increasingly incorporating miniature multi-layered integrated architectures. However, the localization of faults in three-dimensional structure remains challenging. This study involved the experimental and numerical estimation of the depth of a thermally active heating source buried in multi-layered silicon wafer architecture by using both phase information from an ...

Locks are efficient concurrent control mechanisms to ensure that shared resources are accessed by only a single thread in multi-threaded applications. However, for multi-core systems, lock usage leads to lock contention, which degrades program performance, increases system response time, and negatively affects scalability. This paper initially models lock contention from two aspects: static str...

The mono-frequency as well as multi-frequency vortex-induced vibrations of a tensioned beam of aspect ratio 200, immersed in a linear shear flow at Reynolds number 330 and free to move in both the in-line and cross-flow directions, are studied by means of direct numerical simulation. The structural responses are composed of mixed standing–traveling wave patterns. We observe a switch between mon...

This dissertation focuses on the analysis of lock-exchange gravity-driven flows at high Grashof numbers using highly resolved numerical simulations and Large Eddy Simulation (LES) techniques. The present method uses a non-dissipative Navier-Stokes solver in which the sub-grid scale (SGS) viscosity and diffusivity are calculated dynamically. The use of LES allowed the study of these gravity curr...

The practical implementation of the infinite-dimensional optimal estimation results presented in Part I of this series is considered. Several techniques are described in detail. Included among these is the so-called “assumed density” approximation technique. Finite-dimensional suboptimal filtering equations based on this method are derived for several of the phase-tracking/demodulation problems...