Studies are reported of the upper critical fields of Nbo.53Tio.47-Ge multilayers consisting of thick Ge layers and varying-thickness Nbo.s3Tio.47 layers. Both the angular dependence and the temperature dependence of the upper critical fields indicate a dimensional crossover at a Nbo.s3Tio.47 layer thickness near 200 ~ . All the 2D samples display a cusplike upper critical field angular dependen...

Hierarchical code division multiple access (CDMA) cellular systems, consisting of macrocells with underlying microcells, are studied. We seek power control schemes which will allow both hierarchical layers to share the same spectrum. For the reverse link, hierarchical maximal ratio combining (HMRC) is applied where each mobile station (MS) is received and coherently combined by base stations (B...

This paper proposes a layered nonnegative matrix factorization (L-NMF) algorithm for speech separation. The standard NMF method extracts parts-based bases out of nonnegative training data and is often used to separate mixed spectrograms. The proposed L-NMF algorithm comprises of several layers of standard NMF blocks. During training, each layer of the L-NMF is initialized separately and then fi...

The interface structure of graphene with thermally evaporated metal oxide layers, in particular molybdenum trioxide (MoO3), is studied combining photoemission spectroscopy, sheet resistance measurements and organic light emitting diode (OLED) characterization. Thin (<5 nm) MoO3 layers give rise to an 1.9 eV large interface dipole and a downwards bending of the MoO3 conduction band towards the F...

Deep neural network models have achieved considerable success in a wide range of fields. Several architectures have been proposed to alleviate the vanishing gradient problem, and hence enable training of very deep networks. In the speech recognition area, convolutional neural networks, recurrent neural networks, and fully connected deep neural networks have been shown to be complimentary in the...

To optimize the number of decomposition layers in wavelet threshold denoising for ultrasonic signals, we propose a self-adaptive algorithm of determining the number of decomposition layers based on singular spectrum analysis and wavelet entropy. First the noise-containing signals are decomposed by discrete wavelet transform. The slope of the singular value spectrum for each layer is estimated. ...

The results of an experiment combining Doppler beam steering (DBS) and angle of arrival (AOA) measurements are presented. Non-zero values of vertical beam AOAs and oo-zenith DBS power measurements have been attributed to the action of tilted specular layers by various authors. This study aims to directly compare the two sets of measurements in an eeort to determine whether the action of tilting...

A dynamical model for retinal processing is presented. The model describes the output of retinal ganglion cells whose receptive field is composed of a center and a surround combining linearly. However, in comparison to the classical Difference-of-Gaussian (DOG) model, center and surround are generated in two separate layers of reaction-diffusion systems, through a difference in the speed of act...

Combining inkjet printing and atom-transfer radical polymerization (ATRP) provides a straightforward and versatile method for producing patterned polymer surfaces that may serve as platforms for a variety of applications. We report the use of drop-on-demand technology to print binary chemical gradients and simple patterns onto solid substrates and, by using surface-confined ATRP, amplify these ...

This paper describes system level issues encountered in a high performance implementation of a Rijndael encryption core on a memory-slot based reconfigurable computing platform called Pilchard. The Rijndael algorithm was adopted in 2000 by the US National Institute of Standards and Technology (NIST) as the Advanced Encryption Standard (AES). In the implementation of Rijndael, changing the numbe...