9,686 research outputs found
Meson effective mass in the isospin medium in hard-wall AdS/QCD model
We study a mass splitting of light vector, axial-vector and pseudoscalar
mesons in isospin medium in the framework of hard-wall model. We write an
effective mass definition for the interacting gauge fields and scalar field
introduced in gauge field theory in the bulk of AdS space-time. Relying on
holographic duality we obtain a formula for the effective mass of a boundary
meson in terms of derivative operator over the extra bulk coordinate. The
effective mass found in this way coincides with the one obtained from finding
of poles of the two-point correlation function. In order to avoid introducing
distinguished infrared boundaries in the quantisation formula for the different
mesons from the same isotriplet we introduce extra action terms at this
boundary, which reduces distinguished values of this boundary to the same
value. Profile function solutions and effective mass expressions were found for
the in-medium , and mesons.Comment: 28 pages, clarifications added, 3rd section changed, version accepted
for publication in EPJ
Employing Emotion Cues to Verify Speakers in Emotional Talking Environments
Usually, people talk neutrally in environments where there are no abnormal
talking conditions such as stress and emotion. Other emotional conditions that
might affect people talking tone like happiness, anger, and sadness. Such
emotions are directly affected by the patient health status. In neutral talking
environments, speakers can be easily verified, however, in emotional talking
environments, speakers cannot be easily verified as in neutral talking ones.
Consequently, speaker verification systems do not perform well in emotional
talking environments as they do in neutral talking environments. In this work,
a two-stage approach has been employed and evaluated to improve speaker
verification performance in emotional talking environments. This approach
employs speaker emotion cues (text-independent and emotion-dependent speaker
verification problem) based on both Hidden Markov Models (HMMs) and
Suprasegmental Hidden Markov Models (SPHMMs) as classifiers. The approach is
comprised of two cascaded stages that combines and integrates emotion
recognizer and speaker recognizer into one recognizer. The architecture has
been tested on two different and separate emotional speech databases: our
collected database and Emotional Prosody Speech and Transcripts database. The
results of this work show that the proposed approach gives promising results
with a significant improvement over previous studies and other approaches such
as emotion-independent speaker verification approach and emotion-dependent
speaker verification approach based completely on HMMs.Comment: Journal of Intelligent Systems, Special Issue on Intelligent
Healthcare Systems, De Gruyter, 201
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