Dysarthric speaker identification with different degrees of dysarthria severity using deep belief networks

Dysarthria is a degenerative disorder of the central nervous system that affects the control of articulation and pitch; therefore, it affects the uniqueness of sound produced by the speaker. Hence, dysarthric speaker recognition is a challenging task. In this paper, a feature-extraction method based on deep belief networks is presented for the task of identifying a speaker suffering from dysarthria. The effectiveness of the proposed method is demonstrated and compared with well-known Mel-frequency cepstral coefficient features. For classification purposes, the use of a multi-layer perceptron neural network is proposed with two structures. Our evaluations using the universal access speech database produced promising results and outperformed other baseline methods. In addition, speaker identification under both text-dependent and text-independent conditions are explored. The highest accuracy achieved using the proposed system is 97.3%.     

A new variant of cuckoo search algorithm with self adaptive parameters to solve complex RFID network planning problem

Wireless Networks - With the paradigm of the Internet of things, each object in the physical world can be remotely identified, controlled, and located through networks. Thanks to their low cost and...     

Notes on the Syk Model in Real Time

We discuss a nonperturbative formulation of the Sachdev–Ye–Kitaev (SYK) model. The partition function of the model can be represented as a well-defined functional integral over Grassmann variables in Euclidean time, but it diverges after the transformation to fermion bilocal fields. We note that the generating functional of the SYK model in real time is well defined even after the transformation to bilocal fields and can be used for nonperturbative investigations of its properties. We study the SYK model in zero dimensions, evaluate its large-N expansion, and investigate phase transitions.     

On some subsets of Schechter's essential spectrum of a matrix operator and application to transport operator

This paper is devoted to the investigation of the essential approximate point spectrum and the essential defect spectrum of a 2 × 2 block operator matrix on a product of Banach spaces. The obtained results are applied to a two‐group transport operators with general boundary conditions in the Banach space L_p ([–a, a ] × [–1, 1]) × L_p ([–a, a ] × [–1, 1]), a > 0, p ≥ 1 (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Gauge equivalence of Tachyon solutions in the cubic Neveu—Schwarz string field theory

We construct a simple analytic solution of the cubic Neveu—Schwarz (NS) string field theory including the GSO(-) sector. This solution is analogous to the Erler—Schnabl solution in the bosonic case and to the solution in the pure GSO(+) case previously proposed by one of us. We construct exact gauge transformations of the new solution to other known solutions for the NS string tachyon condensation. This gauge equivalence manifestly supports the previous observation that the Erler solution for the pure GSO(+) sector and our solution containing both the GSO(+) and the GSO(-) sectors have the same value of the action density.     

Effect of alkali metals on the surface energy of plutonium

The energy of plutonium at interfaces with melts of alkali metals is estimated using a modified version of the electron statistical method. The expressions for the polarization correction and temperature contribution are modified with allowance for changes in the electron density at the interface. The temperature dependence of the energy on the faces of plutonium modifications is calculated over a wide range of temperatures.     

Ultrarelativistic hadrons as cosmic membranes in TeV-gravity models

We regard an ultrarelativistic hadron moving on a brane embedded in a higher-dimensional space-time as a membrane propagating on a three-brane. For hadron sizes exceeding the compactification radius and characteristic scales of five-dimensional gravitational interaction, this membrane can be regarded as a cosmic membrane in the sense that it extends to the infinities. In the five-dimensional case, a cosmic membrane produces a topological defect similar to the defect produced by a cosmic string in the four-dimensional space-time. This representation allows calculating the effects of the influence of the hadron mass on the gravitational interaction of partons belonging to the colliding hadrons.     

Method of vacuum deposition for the formation of secondary-emission alloy coatings

The fabrication technology and the results of the investigations of thin-film secondary-emission alloy coatings based on alkali-earth metals are described. The vacuum-deposition method is used after the arc-discharge action on coatings in an inert-gas medium. The discharge-current amplitude amounts to 10 kA for a pulse duration of 30 μs in the pulse mode and 10 A and 1 s in the ac mode, respectively. It is shown that the secondary-emission properties do not undergo any considerable modifications, which is related to the formation of solid solutions on the cathode surface and the diffusion of more low-melting components responsible for the secondary-emission properties at the coating surface.