An approach is presented for the discrimination of multi-static active sonar target echoes using the physics of the shallow water waveguide. Physics-based depth discrimination (PBDD) exploits the phenomenon of mode-trapping due to the sound speed gradient in a downward refracting shallow-water channel to separate surfaced and submerged sources of acoustic energy. In such an environment, low ord...

Two Depth Inversion Algorithms (DIAs) were developed and validated using on results of computations for the shoaling of periodic waves over mild slopes, in a twodimensional numerical wave tank, based on fully nonlinear potential flow theory. The first algorithm, DIA1, uses sets of values of wave celerity c, heightH , and spatial wavelengths Lc and Lt, simultaneously measured at a number of loca...

We study in this work the importance of depth in convolutional models for text classification, either when character or word inputs are considered. We show on 5 standard text classification and sentiment analysis tasks that deep models indeed give better performances than shallow networks when the text input is represented as a sequence of characters. However, a simple shallow-and-wide network ...

Since its first implementation in 1995, the shallow NLG system TG/2 has been used as a component in many NLG applications that range from very shallow template systems to in-depth realization engines. TG/2 has continuously been refined, the Java brother implementation XtraGen has become available, and the grammar development environment eGram today allows for designing grammars on a more abstra...

Here is the horizontal velocity vector, is the vertical component of the vorticity, is the Coriolis parameter, is the depth of the fluid, is the height of the “bottom topography,” is the acceleration of gravity, and is the kinetic energy per unit mass. In (7.1), all frictional effects have been neglected, for simplicity. A very useful idealized subset of the shallow-water system describes the s...

This paper evaluates the challenges involved in shallow parsing of Dravidian languages which are highly agglutinative and morphologically rich. Text processing tasks in these languages are not trivial because multiple words concatenate to form a single string with morpho-phonemic changes at the point of concatenation. This phenomenon known as Sandhi, in turn complicates the individual word iden...

[1] Tsunami earthquakes, shallow events that produce larger tsunamis than expected given their surface wave magnitudes (Ms), typically have long durations and a source spectrum depleted in short period energy. Seven cases of underthrusting tsunami earthquakes provide information on the rupture processes, but little constraint on geographic distribution or frequency. We compare their rupture cha...

The sequencing depth necessary for documenting differential gene expression using RNA-Seq has been little explored outside of model systems. In particular, the depth required to analyze large-scale patterns of differential transcription factor expression is not known. The goal of the present study is to explore the effectiveness of shallow (relatively low read depth) RNA-Seq. We focus on two ti...

We present a constraint-based syntax-semantics interface for the construction of RMRS (Robust Minimal Recursion Semantics) representations from shallow grammars. The architecture is designed to allow modular interfaces to existing shallow grammars of various depth – ranging from chunk grammars to context-free stochastic grammars. We define modular semantics construction principles in a typed fe...