A deterministic model for spherical wave propagation in microcellular urban environment is presented. This methodis based on ray tracing and uniform theory of diffraction. The various ray contributions includes the diffraction from corner of obstacle, reflection from ground and direct wave. According to the height of transmitting station, different ray paths will be presented in the received si...

This document briefly describes the systems submitted by the Center for Robust Speech Systems (CRSS) from The University of Texas at Dallas (UTD) for the 2012 NIST Speaker Recognition Evaluation. We developed a state-of-the-art i-vector based speaker recognition system [1]. Probabilistic linear discriminant analysis (PLDA) [2] along with several other backends are used for channel/noise compens...

Recently, the rapid development of inexpensive RGB-D sensor, like Microsoft Kinect, provides adequate information for human action recognition. In this paper, a recognition algorithm is presented in which feature representation is generated by concatenating spatial features from human contour of key frames and temporal features from time difference information of a sequence. Then, an improved m...

In this paper, radio wave propagation over irregular terrain is investigated in 200–600MHz (VHF/UHF band). Measured results are compared with different path loss models such as Fresnel knife edge diffraction and uniform theory of diffraction (UTD). It is shown that, for low antenna heights, using a combination of the two-ray path loss model and knife-edge diffraction, great improvement in path ...

This paper describes our system for SemEval-2010 Task 8 on multi-way classification of semantic relations between nominals. First, the type of semantic relation is classified. Then a relation typespecific classifier determines the relation direction. Classification is performed using SVM classifiers and a number of features that capture the context, semantic role affiliation, and possible pre-e...

The geometrical theory of diffraction (GTD) provides a powerful and computationally efficient framework for investigating real-world diffraction problems. Originally restricted to perfectly electrically conducting (PEC) wedges, the GTD and its uniform offspring have since been extended to wedges characterized by impedance surfaces (R. Tiberio et al., IEEE Trans. AP, 37, 2, 212-218, 1989). Thoug...

We describe improvements to our 2008 system that result in a top-performing summarization system. The motivating ideas are (1) improve sentence boundary detection to avoid damaging errors in preprocessing; (2) prune sentences that are unlikely to work well in a summary; (3) leverage sentence position to improve update summarization; (4) focus on high-precision sentence compression to improve re...

The UTD mote system (UTMOST) is a low power all purpose platform for wireless sensor nodes (WSN) based on offthe-shelf components. UTMOST offers a number of improved functionalities over previously designed platforms, e.g., energy consumption, wireless reprogramming, processing frequency, and storage capability. This paper details how hardware components are selected and integrated to enable su...