Motivated by many practical scenarios, in this paper we study fundamental limits to performance of sensor networks for a class of linear sensing models under a fixed SNR regime. Under a linear observation model the information about a signal X ∈ Rn is acquired as projections onto a set of m vectors. We extend this set-up in several ways to address problems of detection, classification and estim...

A tomographic imaging system based on wavelength-scanning digital interference holography is developed by applying the angular spectrum method. Compared to the well-known Fresnel diffraction formula, which is subject to a minimum distance requirement in reconstruction, the angular spectrum method can reconstruct the wave field at any distance from the hologram plane. The new system allows three...

of the information the applicant is prepared to prove in support of his opposition to the Commissioner’s proposal. A request for a hearing may not rest upon mere allegations or denials, but must set forth specific facts showing there is a genuine and substantial issue of fact that requires a hearing. When it clearly appears from the information in the application and from the reasons and factua...

OBJECTIVE To compare changes in interface pressures of three compression systems (four layer, two layer and short stretch) recorded over seven days in healthy volunteers in different positions: supine, sitting, active standing and working pressure during exercise. METHOD Twenty-four volunteers were bandaged with one of the three compression systems on both legs. Interface pressures were measu...

When automatic speech recognition (ASR) is applied to hands-free or other adverse acoustic environments, endpoint detection and energy normalization can be crucial to the entire system. In low signal-to-noise (SNR) situations,conventional approaches of endpointing and energy normalization often fail and ASR performances usually degrade dramatically. The goal of this paper is to find a fast, acc...

Optical imaging through complex media has many important applications. Although research progresses have been made to recover optical image through various turbid media, the widespread application of the technology is hampered by the recovery speed, requirement on specific illumination, poor image quality and limited field of view. Here we demonstrate that above-mentioned drawbacks can be essen...

By the end of 2007, thirty states and the District of Columbia had passed some sort of subprime mortgage regulation statute, while the remaining states left the subprime mortgage market unregulated. Were these state mortgage laws effective in restraining risky mortgage lending and mitigating the surge in foreclosures? Our study takes advantage of this natural experiment and compares loan terms,...