This paper introduces two short-time spectral amplitude estimators for speech enhancement with multiple microphones. Based on joint Gaussian models of speech and noise Fourier coefficients, the clean speech amplitudes are estimated with respect to the MMSE or the MAP criterion. The estimators outperform single microphone minimum mean square amplitude estimators when the speech components are hi...

A finitely presentable group G is hyperbolic if and only if the map H2 b (G, V ) → H2(G, V ) is surjective for any bounded G-module. The ‘only if’ direction is known and here we prove the ‘if’ direction. We also consider several ways to define a linear homological isoperimetric inequality.

Investigation of the relationship between plant species and environmental factors plays an important role in plant ecology. The present study aimed to develop the best predicting model for distribution of Prangos uloptera DC. using logistic regression (LR) and Maximum Entropy Methods (MaxEnt) in its habitat in the southern rangeland of Ardabil province, Iran. Vegetation data (presence and absen...

introduction: coronal microleakage may significantly reduce the prognosis of endodontic treatment. temporary restorative materials have a crucial role in preventing the infection of root canals between and after endodontic treatment. this in vitro study was designed to evaluate the coronal microleakage of three temporary restorative materials used in endodontics: coltosol, cavisol and cina. mat...

provisional cements are commonly used to facilitate retrievability of cement-retained fixed implant restorations; but compromised abutment preparation may affect the retention of implant-retained crowns.the purpose of this study was to investigate the effect of abutment design and type of luting agent on the retentive strength of cement-retained implant restorations.two prefabricated abutments ...

Fire managers who respond to wildland fire outbreak will need intelligent information regarding the state of the fire such as location, direction and active fire perimeter for better fire management. The Infrared Interpreters, who visually examine the infrared imagery to provide intelligent information, usually undertake the task of drawing the active fire map by hand. Vegetation indices like N...

Road extraction from synthetic aperture radar (SAR) images has attracted much attention in the field of remote sensing image processing. General road algorithms, affected by shadows buildings and trees, are prone to producing fragmented segments. To improve accuracy completeness extraction, we propose a neural network-based algorithm which takes connectivity direction features roads into consid...